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= require('./lib/_stream_duplex.js');\n","'use strict'\n\nvar tough = require('tough-cookie')\n\nvar Cookie = tough.Cookie\nvar CookieJar = tough.CookieJar\n\nexports.parse = function (str) {\n  if (str && str.uri) {\n    str = str.uri\n  }\n  if (typeof str !== 'string') {\n    throw new Error('The cookie function only accepts STRING as param')\n  }\n  return Cookie.parse(str, {loose: true})\n}\n\n// Adapt the sometimes-Async api of tough.CookieJar to our requirements\nfunction RequestJar (store) {\n  var self = this\n  self._jar = new CookieJar(store, {looseMode: true})\n}\nRequestJar.prototype.setCookie = function (cookieOrStr, uri, options) {\n  var self = this\n  return self._jar.setCookieSync(cookieOrStr, uri, options || {})\n}\nRequestJar.prototype.getCookieString = function (uri) {\n  var self = this\n  return self._jar.getCookieStringSync(uri)\n}\nRequestJar.prototype.getCookies = function (uri) {\n  var self = this\n  return self._jar.getCookiesSync(uri)\n}\n\nexports.jar = function (store) {\n  return new RequestJar(store)\n}\n","'use strict'\n\n// limit of Crypto.getRandomValues()\n// https://developer.mozilla.org/en-US/docs/Web/API/Crypto/getRandomValues\nvar MAX_BYTES = 65536\n\n// Node supports requesting up to this number of bytes\n// https://github.com/nodejs/node/blob/master/lib/internal/crypto/random.js#L48\nvar MAX_UINT32 = 4294967295\n\nfunction oldBrowser () {\n  throw new Error('Secure random number generation is not supported by this browser.\\nUse Chrome, Firefox or Internet Explorer 11')\n}\n\nvar Buffer = require('safe-buffer').Buffer\nvar crypto = global.crypto || global.msCrypto\n\nif (crypto && crypto.getRandomValues) {\n  module.exports = randomBytes\n} else {\n  module.exports = oldBrowser\n}\n\nfunction randomBytes (size, cb) {\n  // phantomjs needs to throw\n  if (size > MAX_UINT32) throw new RangeError('requested too many random bytes')\n\n  var bytes = Buffer.allocUnsafe(size)\n\n  if (size > 0) {  // getRandomValues fails on IE if size == 0\n    if (size > MAX_BYTES) { // this is the max bytes crypto.getRandomValues\n      // can do at once see https://developer.mozilla.org/en-US/docs/Web/API/window.crypto.getRandomValues\n      for (var generated = 0; generated < size; generated += MAX_BYTES) {\n        // buffer.slice automatically checks if the end is past the end of\n        // the buffer so we don't have to here\n        crypto.getRandomValues(bytes.slice(generated, generated + MAX_BYTES))\n      }\n    } else {\n      crypto.getRandomValues(bytes)\n    }\n  }\n\n  if (typeof cb === 'function') {\n    return process.nextTick(function () {\n      cb(null, bytes)\n    })\n  }\n\n  return bytes\n}\n","'use strict'\n\nvar jsonSafeStringify = require('json-stringify-safe')\nvar crypto = require('crypto')\nvar Buffer = require('safe-buffer').Buffer\n\nvar defer = typeof setImmediate === 'undefined'\n  ? process.nextTick\n  : setImmediate\n\nfunction paramsHaveRequestBody (params) {\n  return (\n    params.body ||\n    params.requestBodyStream ||\n    (params.json && typeof params.json !== 'boolean') ||\n    params.multipart\n  )\n}\n\nfunction safeStringify (obj, replacer) {\n  var ret\n  try {\n    ret = JSON.stringify(obj, replacer)\n  } catch (e) {\n    ret = jsonSafeStringify(obj, replacer)\n  }\n  return ret\n}\n\nfunction md5 (str) {\n  return crypto.createHash('md5').update(str).digest('hex')\n}\n\nfunction isReadStream (rs) {\n  return rs.readable && rs.path && rs.mode\n}\n\nfunction toBase64 (str) {\n  return Buffer.from(str || '', 'utf8').toString('base64')\n}\n\nfunction copy (obj) {\n  var o = {}\n  Object.keys(obj).forEach(function (i) {\n    o[i] = obj[i]\n  })\n  return o\n}\n\nfunction version () {\n  var numbers = process.version.replace('v', '').split('.')\n  return {\n    major: parseInt(numbers[0], 10),\n    minor: parseInt(numbers[1], 10),\n    patch: parseInt(numbers[2], 10)\n  }\n}\n\nexports.paramsHaveRequestBody = paramsHaveRequestBody\nexports.safeStringify = safeStringify\nexports.md5 = md5\nexports.isReadStream = isReadStream\nexports.toBase64 = toBase64\nexports.copy = copy\nexports.version = version\nexports.defer = defer\n","// Copyright Joyent, Inc. and other Node contributors.\n//\n// Permission is hereby granted, free of charge, to any person obtaining a\n// copy of this software and associated documentation files (the\n// \"Software\"), to deal in the Software without restriction, including\n// without limitation the rights to use, copy, modify, merge, publish,\n// distribute, sublicense, and/or sell copies of the Software, and to permit\n// persons to whom the Software is furnished to do so, subject to the\n// following conditions:\n//\n// The above copyright notice and this permission notice shall be included\n// in all copies or substantial portions of the Software.\n//\n// THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS\n// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF\n// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN\n// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,\n// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR\n// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE\n// USE OR OTHER DEALINGS IN THE SOFTWARE.\n\n// a transform stream is a readable/writable stream where you do\n// something with the data.  Sometimes it's called a \"filter\",\n// but that's not a great name for it, since that implies a thing where\n// some bits pass through, and others are simply ignored.  (That would\n// be a valid example of a transform, of course.)\n//\n// While the output is causally related to the input, it's not a\n// necessarily symmetric or synchronous transformation.  For example,\n// a zlib stream might take multiple plain-text writes(), and then\n// emit a single compressed chunk some time in the future.\n//\n// Here's how this works:\n//\n// The Transform stream has all the aspects of the readable and writable\n// stream classes.  When you write(chunk), that calls _write(chunk,cb)\n// internally, and returns false if there's a lot of pending writes\n// buffered up.  When you call read(), that calls _read(n) until\n// there's enough pending readable data buffered up.\n//\n// In a transform stream, the written data is placed in a buffer.  When\n// _read(n) is called, it transforms the queued up data, calling the\n// buffered _write cb's as it consumes chunks.  If consuming a single\n// written chunk would result in multiple output chunks, then the first\n// outputted bit calls the readcb, and subsequent chunks just go into\n// the read buffer, and will cause it to emit 'readable' if necessary.\n//\n// This way, back-pressure is actually determined by the reading side,\n// since _read has to be called to start processing a new chunk.  However,\n// a pathological inflate type of transform can cause excessive buffering\n// here.  For example, imagine a stream where every byte of input is\n// interpreted as an integer from 0-255, and then results in that many\n// bytes of output.  Writing the 4 bytes {ff,ff,ff,ff} would result in\n// 1kb of data being output.  In this case, you could write a very small\n// amount of input, and end up with a very large amount of output.  In\n// such a pathological inflating mechanism, there'd be no way to tell\n// the system to stop doing the transform.  A single 4MB write could\n// cause the system to run out of memory.\n//\n// However, even in such a pathological case, only a single written chunk\n// would be consumed, and then the rest would wait (un-transformed) until\n// the results of the previous transformed chunk were consumed.\n\n'use strict';\n\nmodule.exports = Transform;\n\nvar Duplex = require('./_stream_duplex');\n\n/*<replacement>*/\nvar util = Object.create(require('core-util-is'));\nutil.inherits = require('inherits');\n/*</replacement>*/\n\nutil.inherits(Transform, Duplex);\n\nfunction afterTransform(er, data) {\n  var ts = this._transformState;\n  ts.transforming = false;\n\n  var cb = ts.writecb;\n\n  if (!cb) {\n    return this.emit('error', new Error('write callback called multiple times'));\n  }\n\n  ts.writechunk = null;\n  ts.writecb = null;\n\n  if (data != null) // single equals check for both `null` and `undefined`\n    this.push(data);\n\n  cb(er);\n\n  var rs = this._readableState;\n  rs.reading = false;\n  if (rs.needReadable || rs.length < rs.highWaterMark) {\n    this._read(rs.highWaterMark);\n  }\n}\n\nfunction Transform(options) {\n  if (!(this instanceof Transform)) return new Transform(options);\n\n  Duplex.call(this, options);\n\n  this._transformState = {\n    afterTransform: afterTransform.bind(this),\n    needTransform: false,\n    transforming: false,\n    writecb: null,\n    writechunk: null,\n    writeencoding: null\n  };\n\n  // start out asking for a readable event once data is transformed.\n  this._readableState.needReadable = true;\n\n  // we have implemented the _read method, and done the other things\n  // that Readable wants before the first _read call, so unset the\n  // sync guard flag.\n  this._readableState.sync = false;\n\n  if (options) {\n    if (typeof options.transform === 'function') this._transform = options.transform;\n\n    if (typeof options.flush === 'function') this._flush = options.flush;\n  }\n\n  // When the writable side finishes, then flush out anything remaining.\n  this.on('prefinish', prefinish);\n}\n\nfunction prefinish() {\n  var _this = this;\n\n  if (typeof this._flush === 'function') {\n    this._flush(function (er, data) {\n      done(_this, er, data);\n    });\n  } else {\n    done(this, null, null);\n  }\n}\n\nTransform.prototype.push = function (chunk, encoding) {\n  this._transformState.needTransform = false;\n  return Duplex.prototype.push.call(this, chunk, encoding);\n};\n\n// This is the part where you do stuff!\n// override this function in implementation classes.\n// 'chunk' is an input chunk.\n//\n// Call `push(newChunk)` to pass along transformed output\n// to the readable side.  You may call 'push' zero or more times.\n//\n// Call `cb(err)` when you are done with this chunk.  If you pass\n// an error, then that'll put the hurt on the whole operation.  If you\n// never call cb(), then you'll never get another chunk.\nTransform.prototype._transform = function (chunk, encoding, cb) {\n  throw new Error('_transform() is not implemented');\n};\n\nTransform.prototype._write = function (chunk, encoding, cb) {\n  var ts = this._transformState;\n  ts.writecb = cb;\n  ts.writechunk = chunk;\n  ts.writeencoding = encoding;\n  if (!ts.transforming) {\n    var rs = this._readableState;\n    if (ts.needTransform || rs.needReadable || rs.length < rs.highWaterMark) this._read(rs.highWaterMark);\n  }\n};\n\n// Doesn't matter what the args are here.\n// _transform does all the work.\n// That we got here means that the readable side wants more data.\nTransform.prototype._read = function (n) {\n  var ts = this._transformState;\n\n  if (ts.writechunk !== null && ts.writecb && !ts.transforming) {\n    ts.transforming = true;\n    this._transform(ts.writechunk, ts.writeencoding, ts.afterTransform);\n  } else {\n    // mark that we need a transform, so that any data that comes in\n    // will get processed, now that we've asked for it.\n    ts.needTransform = true;\n  }\n};\n\nTransform.prototype._destroy = function (err, cb) {\n  var _this2 = this;\n\n  Duplex.prototype._destroy.call(this, err, function (err2) {\n    cb(err2);\n    _this2.emit('close');\n  });\n};\n\nfunction done(stream, er, data) {\n  if (er) return stream.emit('error', er);\n\n  if (data != null) // single equals check for both `null` and `undefined`\n    stream.push(data);\n\n  // if there's nothing in the write buffer, then that means\n  // that nothing more will ever be provided\n  if (stream._writableState.length) throw new Error('Calling transform done when ws.length != 0');\n\n  if (stream._transformState.transforming) throw new Error('Calling transform done when still transforming');\n\n  return stream.push(null);\n}","module.exports = require('./lib/_stream_writable.js');\n","'use strict'\n\nvar qs = require('qs')\nvar querystring = require('querystring')\n\nfunction Querystring (request) {\n  this.request = request\n  this.lib = null\n  this.useQuerystring = null\n  this.parseOptions = null\n  this.stringifyOptions = null\n}\n\nQuerystring.prototype.init = function (options) {\n  if (this.lib) { return }\n\n  this.useQuerystring = options.useQuerystring\n  this.lib = (this.useQuerystring ? querystring : qs)\n\n  this.parseOptions = options.qsParseOptions || {}\n  this.stringifyOptions = options.qsStringifyOptions || {}\n}\n\nQuerystring.prototype.stringify = function (obj) {\n  return (this.useQuerystring)\n    ? this.rfc3986(this.lib.stringify(obj,\n      this.stringifyOptions.sep || null,\n      this.stringifyOptions.eq || null,\n      this.stringifyOptions))\n    : this.lib.stringify(obj, this.stringifyOptions)\n}\n\nQuerystring.prototype.parse = function (str) {\n  return (this.useQuerystring)\n    ? this.lib.parse(str,\n      this.parseOptions.sep || null,\n      this.parseOptions.eq || null,\n      this.parseOptions)\n    : this.lib.parse(str, this.parseOptions)\n}\n\nQuerystring.prototype.rfc3986 = function (str) {\n  return str.replace(/[!'()*]/g, function (c) {\n    return '%' + c.charCodeAt(0).toString(16).toUpperCase()\n  })\n}\n\nQuerystring.prototype.unescape = querystring.unescape\n\nexports.Querystring = Querystring\n","// Copyright 2010-2012 Mikeal Rogers\n//\n//    Licensed under the Apache License, Version 2.0 (the \"License\");\n//    you may not use this file except in compliance with the License.\n//    You may obtain a copy of the License at\n//\n//        http://www.apache.org/licenses/LICENSE-2.0\n//\n//    Unless required by applicable law or agreed to in writing, software\n//    distributed under the License is distributed on an \"AS IS\" BASIS,\n//    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n//    See the License for the specific language governing permissions and\n//    limitations under the License.\n\n'use strict'\n\nvar extend = require('extend')\nvar cookies = require('./lib/cookies')\nvar helpers = require('./lib/helpers')\n\nvar paramsHaveRequestBody = helpers.paramsHaveRequestBody\n\n// organize params for patch, post, put, head, del\nfunction initParams (uri, options, callback) {\n  if (typeof options === 'function') {\n    callback = options\n  }\n\n  var params = {}\n  if (options !== null && typeof options === 'object') {\n    extend(params, options, {uri: uri})\n  } else if (typeof uri === 'string') {\n    extend(params, {uri: uri})\n  } else {\n    extend(params, uri)\n  }\n\n  params.callback = callback || params.callback\n  return params\n}\n\nfunction request (uri, options, callback) {\n  if (typeof uri === 'undefined') {\n    throw new Error('undefined is not a valid uri or options object.')\n  }\n\n  var params = initParams(uri, options, callback)\n\n  if (params.method === 'HEAD' && paramsHaveRequestBody(params)) {\n    throw new Error('HTTP HEAD requests MUST NOT include a request body.')\n  }\n\n  return new request.Request(params)\n}\n\nfunction verbFunc (verb) {\n  var method = verb.toUpperCase()\n  return function (uri, options, callback) {\n    var params = initParams(uri, options, callback)\n    params.method = method\n    return request(params, params.callback)\n  }\n}\n\n// define like this to please codeintel/intellisense IDEs\nrequest.get = verbFunc('get')\nrequest.head = verbFunc('head')\nrequest.options = verbFunc('options')\nrequest.post = verbFunc('post')\nrequest.put = verbFunc('put')\nrequest.patch = verbFunc('patch')\nrequest.del = verbFunc('delete')\nrequest['delete'] = verbFunc('delete')\n\nrequest.jar = function (store) {\n  return cookies.jar(store)\n}\n\nrequest.cookie = function (str) {\n  return cookies.parse(str)\n}\n\nfunction wrapRequestMethod (method, options, requester, verb) {\n  return function (uri, opts, callback) {\n    var params = initParams(uri, opts, callback)\n\n    var target = {}\n    extend(true, target, options, params)\n\n    target.pool = params.pool || options.pool\n\n    if (verb) {\n      target.method = verb.toUpperCase()\n    }\n\n    if (typeof requester === 'function') {\n      method = requester\n    }\n\n    return method(target, target.callback)\n  }\n}\n\nrequest.defaults = function (options, requester) {\n  var self = this\n\n  options = options || {}\n\n  if (typeof options === 'function') {\n    requester = options\n    options = {}\n  }\n\n  var defaults = wrapRequestMethod(self, options, requester)\n\n  var verbs = ['get', 'head', 'post', 'put', 'patch', 'del', 'delete']\n  verbs.forEach(function (verb) {\n    defaults[verb] = wrapRequestMethod(self[verb], options, requester, verb)\n  })\n\n  defaults.cookie = wrapRequestMethod(self.cookie, options, requester)\n  defaults.jar = self.jar\n  defaults.defaults = self.defaults\n  return defaults\n}\n\nrequest.forever = function (agentOptions, optionsArg) {\n  var options = {}\n  if (optionsArg) {\n    extend(options, optionsArg)\n  }\n  if (agentOptions) {\n    options.agentOptions = agentOptions\n  }\n\n  options.forever = true\n  return request.defaults(options)\n}\n\n// Exports\n\nmodule.exports = request\nrequest.Request = require('./request')\nrequest.initParams = initParams\n\n// Backwards compatibility for request.debug\nObject.defineProperty(request, 'debug', {\n  enumerable: true,\n  get: function () {\n    return request.Request.debug\n  },\n  set: function (debug) {\n    request.Request.debug = debug\n  }\n})\n","'use strict'\n\nvar uuid = require('uuid/v4')\nvar CombinedStream = require('combined-stream')\nvar isstream = require('isstream')\nvar Buffer = require('safe-buffer').Buffer\n\nfunction Multipart (request) {\n  this.request = request\n  this.boundary = uuid()\n  this.chunked = false\n  this.body = null\n}\n\nMultipart.prototype.isChunked = function (options) {\n  var self = this\n  var chunked = false\n  var parts = options.data || options\n\n  if (!parts.forEach) {\n    self.request.emit('error', new Error('Argument error, options.multipart.'))\n  }\n\n  if (options.chunked !== undefined) {\n    chunked = options.chunked\n  }\n\n  if (self.request.getHeader('transfer-encoding') === 'chunked') {\n    chunked = true\n  }\n\n  if (!chunked) {\n    parts.forEach(function (part) {\n      if (typeof part.body === 'undefined') {\n        self.request.emit('error', new Error('Body attribute missing in multipart.'))\n      }\n      if (isstream(part.body)) {\n        chunked = true\n      }\n    })\n  }\n\n  return chunked\n}\n\nMultipart.prototype.setHeaders = function (chunked) {\n  var self = this\n\n  if (chunked && !self.request.hasHeader('transfer-encoding')) {\n    self.request.setHeader('transfer-encoding', 'chunked')\n  }\n\n  var header = self.request.getHeader('content-type')\n\n  if (!header || header.indexOf('multipart') === -1) {\n    self.request.setHeader('content-type', 'multipart/related; boundary=' + self.boundary)\n  } else {\n    if (header.indexOf('boundary') !== -1) {\n      self.boundary = header.replace(/.*boundary=([^\\s;]+).*/, '$1')\n    } else {\n      self.request.setHeader('content-type', header + '; boundary=' + self.boundary)\n    }\n  }\n}\n\nMultipart.prototype.build = function (parts, chunked) {\n  var self = this\n  var body = chunked ? new CombinedStream() : []\n\n  function add (part) {\n    if (typeof part === 'number') {\n      part = part.toString()\n    }\n    return chunked ? body.append(part) : body.push(Buffer.from(part))\n  }\n\n  if (self.request.preambleCRLF) {\n    add('\\r\\n')\n  }\n\n  parts.forEach(function (part) {\n    var preamble = '--' + self.boundary + '\\r\\n'\n    Object.keys(part).forEach(function (key) {\n      if (key === 'body') { return }\n      preamble += key + ': ' + part[key] + '\\r\\n'\n    })\n    preamble += '\\r\\n'\n    add(preamble)\n    add(part.body)\n    add('\\r\\n')\n  })\n  add('--' + self.boundary + '--')\n\n  if (self.request.postambleCRLF) {\n    add('\\r\\n')\n  }\n\n  return body\n}\n\nMultipart.prototype.onRequest = function (options) {\n  var self = this\n\n  var chunked = self.isChunked(options)\n  var parts = options.data || options\n\n  self.setHeaders(chunked)\n  self.chunked = chunked\n  self.body = self.build(parts, chunked)\n}\n\nexports.Multipart = Multipart\n","'use strict'\n\nvar http = require('http')\nvar https = require('https')\nvar url = require('url')\nvar util = require('util')\nvar stream = require('stream')\nvar zlib = require('zlib')\nvar aws2 = require('aws-sign2')\nvar aws4 = require('aws4')\nvar httpSignature = require('http-signature')\nvar mime = require('mime-types')\nvar caseless = require('caseless')\nvar ForeverAgent = require('forever-agent')\nvar FormData = require('form-data')\nvar extend = require('extend')\nvar isstream = require('isstream')\nvar isTypedArray = require('is-typedarray').strict\nvar helpers = require('./lib/helpers')\nvar cookies = require('./lib/cookies')\nvar getProxyFromURI = require('./lib/getProxyFromURI')\nvar Querystring = require('./lib/querystring').Querystring\nvar Har = require('./lib/har').Har\nvar Auth = require('./lib/auth').Auth\nvar OAuth = require('./lib/oauth').OAuth\nvar hawk = require('./lib/hawk')\nvar Multipart = require('./lib/multipart').Multipart\nvar Redirect = require('./lib/redirect').Redirect\nvar Tunnel = require('./lib/tunnel').Tunnel\nvar now = require('performance-now')\nvar Buffer = require('safe-buffer').Buffer\n\nvar safeStringify = helpers.safeStringify\nvar isReadStream = helpers.isReadStream\nvar toBase64 = helpers.toBase64\nvar defer = helpers.defer\nvar copy = helpers.copy\nvar version = helpers.version\nvar globalCookieJar = cookies.jar()\n\nvar globalPool = {}\n\nfunction filterForNonReserved (reserved, options) {\n  // Filter out properties that are not reserved.\n  // Reserved values are passed in at call site.\n\n  var object = {}\n  for (var i in options) {\n    var notReserved = (reserved.indexOf(i) === -1)\n    if (notReserved) {\n      object[i] = options[i]\n    }\n  }\n  return object\n}\n\nfunction filterOutReservedFunctions (reserved, options) {\n  // Filter out properties that are functions and are reserved.\n  // Reserved values are passed in at call site.\n\n  var object = {}\n  for (var i in options) {\n    var isReserved = !(reserved.indexOf(i) === -1)\n    var isFunction = (typeof options[i] === 'function')\n    if (!(isReserved && isFunction)) {\n      object[i] = options[i]\n    }\n  }\n  return object\n}\n\n// Return a simpler request object to allow serialization\nfunction requestToJSON () {\n  var self = this\n  return {\n    uri: self.uri,\n    method: self.method,\n    headers: self.headers\n  }\n}\n\n// Return a simpler response object to allow serialization\nfunction responseToJSON () {\n  var self = this\n  return {\n    statusCode: self.statusCode,\n    body: self.body,\n    headers: self.headers,\n    request: requestToJSON.call(self.request)\n  }\n}\n\nfunction Request (options) {\n  // if given the method property in options, set property explicitMethod to true\n\n  // extend the Request instance with any non-reserved properties\n  // remove any reserved functions from the options object\n  // set Request instance to be readable and writable\n  // call init\n\n  var self = this\n\n  // start with HAR, then override with additional options\n  if (options.har) {\n    self._har = new Har(self)\n    options = self._har.options(options)\n  }\n\n  stream.Stream.call(self)\n  var reserved = Object.keys(Request.prototype)\n  var nonReserved = filterForNonReserved(reserved, options)\n\n  extend(self, nonReserved)\n  options = filterOutReservedFunctions(reserved, options)\n\n  self.readable = true\n  self.writable = true\n  if (options.method) {\n    self.explicitMethod = true\n  }\n  self._qs = new Querystring(self)\n  self._auth = new Auth(self)\n  self._oauth = new OAuth(self)\n  self._multipart = new Multipart(self)\n  self._redirect = new Redirect(self)\n  self._tunnel = new Tunnel(self)\n  self.init(options)\n}\n\nutil.inherits(Request, stream.Stream)\n\n// Debugging\nRequest.debug = process.env.NODE_DEBUG && /\\brequest\\b/.test(process.env.NODE_DEBUG)\nfunction debug () {\n  if (Request.debug) {\n    console.error('REQUEST %s', util.format.apply(util, arguments))\n  }\n}\nRequest.prototype.debug = debug\n\nRequest.prototype.init = function (options) {\n  // init() contains all the code to setup the request object.\n  // the actual outgoing request is not started until start() is called\n  // this function is called from both the constructor and on redirect.\n  var self = this\n  if (!options) {\n    options = {}\n  }\n  self.headers = self.headers ? copy(self.headers) : {}\n\n  // Delete headers with value undefined since they break\n  // ClientRequest.OutgoingMessage.setHeader in node 0.12\n  for (var headerName in self.headers) {\n    if (typeof self.headers[headerName] === 'undefined') {\n      delete self.headers[headerName]\n    }\n  }\n\n  caseless.httpify(self, self.headers)\n\n  if (!self.method) {\n    self.method = options.method || 'GET'\n  }\n  if (!self.localAddress) {\n    self.localAddress = options.localAddress\n  }\n\n  self._qs.init(options)\n\n  debug(options)\n  if (!self.pool && self.pool !== false) {\n    self.pool = globalPool\n  }\n  self.dests = self.dests || []\n  self.__isRequestRequest = true\n\n  // Protect against double callback\n  if (!self._callback && self.callback) {\n    self._callback = self.callback\n    self.callback = function () {\n      if (self._callbackCalled) {\n        return // Print a warning maybe?\n      }\n      self._callbackCalled = true\n      self._callback.apply(self, arguments)\n    }\n    self.on('error', self.callback.bind())\n    self.on('complete', self.callback.bind(self, null))\n  }\n\n  // People use this property instead all the time, so support it\n  if (!self.uri && self.url) {\n    self.uri = self.url\n    delete self.url\n  }\n\n  // If there's a baseUrl, then use it as the base URL (i.e. uri must be\n  // specified as a relative path and is appended to baseUrl).\n  if (self.baseUrl) {\n    if (typeof self.baseUrl !== 'string') {\n      return self.emit('error', new Error('options.baseUrl must be a string'))\n    }\n\n    if (typeof self.uri !== 'string') {\n      return self.emit('error', new Error('options.uri must be a string when using options.baseUrl'))\n    }\n\n    if (self.uri.indexOf('//') === 0 || self.uri.indexOf('://') !== -1) {\n      return self.emit('error', new Error('options.uri must be a path when using options.baseUrl'))\n    }\n\n    // Handle all cases to make sure that there's only one slash between\n    // baseUrl and uri.\n    var baseUrlEndsWithSlash = self.baseUrl.lastIndexOf('/') === self.baseUrl.length - 1\n    var uriStartsWithSlash = self.uri.indexOf('/') === 0\n\n    if (baseUrlEndsWithSlash && uriStartsWithSlash) {\n      self.uri = self.baseUrl + self.uri.slice(1)\n    } else if (baseUrlEndsWithSlash || uriStartsWithSlash) {\n      self.uri = self.baseUrl + self.uri\n    } else if (self.uri === '') {\n      self.uri = self.baseUrl\n    } else {\n      self.uri = self.baseUrl + '/' + self.uri\n    }\n    delete self.baseUrl\n  }\n\n  // A URI is needed by this point, emit error if we haven't been able to get one\n  if (!self.uri) {\n    return self.emit('error', new Error('options.uri is a required argument'))\n  }\n\n  // If a string URI/URL was given, parse it into a URL object\n  if (typeof self.uri === 'string') {\n    self.uri = url.parse(self.uri)\n  }\n\n  // Some URL objects are not from a URL parsed string and need href added\n  if (!self.uri.href) {\n    self.uri.href = url.format(self.uri)\n  }\n\n  // DEPRECATED: Warning for users of the old Unix Sockets URL Scheme\n  if (self.uri.protocol === 'unix:') {\n    return self.emit('error', new Error('`unix://` URL scheme is no longer supported. Please use the format `http://unix:SOCKET:PATH`'))\n  }\n\n  // Support Unix Sockets\n  if (self.uri.host === 'unix') {\n    self.enableUnixSocket()\n  }\n\n  if (self.strictSSL === false) {\n    self.rejectUnauthorized = false\n  }\n\n  if (!self.uri.pathname) { self.uri.pathname = '/' }\n\n  if (!(self.uri.host || (self.uri.hostname && self.uri.port)) && !self.uri.isUnix) {\n    // Invalid URI: it may generate lot of bad errors, like 'TypeError: Cannot call method `indexOf` of undefined' in CookieJar\n    // Detect and reject it as soon as possible\n    var faultyUri = url.format(self.uri)\n    var message = 'Invalid URI \"' + faultyUri + '\"'\n    if (Object.keys(options).length === 0) {\n      // No option ? This can be the sign of a redirect\n      // As this is a case where the user cannot do anything (they didn't call request directly with this URL)\n      // they should be warned that it can be caused by a redirection (can save some hair)\n      message += '. This can be caused by a crappy redirection.'\n    }\n    // This error was fatal\n    self.abort()\n    return self.emit('error', new Error(message))\n  }\n\n  if (!self.hasOwnProperty('proxy')) {\n    self.proxy = getProxyFromURI(self.uri)\n  }\n\n  self.tunnel = self._tunnel.isEnabled()\n  if (self.proxy) {\n    self._tunnel.setup(options)\n  }\n\n  self._redirect.onRequest(options)\n\n  self.setHost = false\n  if (!self.hasHeader('host')) {\n    var hostHeaderName = self.originalHostHeaderName || 'host'\n    self.setHeader(hostHeaderName, self.uri.host)\n    // Drop :port suffix from Host header if known protocol.\n    if (self.uri.port) {\n      if ((self.uri.port === '80' && self.uri.protocol === 'http:') ||\n          (self.uri.port === '443' && self.uri.protocol === 'https:')) {\n        self.setHeader(hostHeaderName, self.uri.hostname)\n      }\n    }\n    self.setHost = true\n  }\n\n  self.jar(self._jar || options.jar)\n\n  if (!self.uri.port) {\n    if (self.uri.protocol === 'http:') { self.uri.port = 80 } else if (self.uri.protocol === 'https:') { self.uri.port = 443 }\n  }\n\n  if (self.proxy && !self.tunnel) {\n    self.port = self.proxy.port\n    self.host = self.proxy.hostname\n  } else {\n    self.port = self.uri.port\n    self.host = self.uri.hostname\n  }\n\n  if (options.form) {\n    self.form(options.form)\n  }\n\n  if (options.formData) {\n    var formData = options.formData\n    var requestForm = self.form()\n    var appendFormValue = function (key, value) {\n      if (value && value.hasOwnProperty('value') && value.hasOwnProperty('options')) {\n        requestForm.append(key, value.value, value.options)\n      } else {\n        requestForm.append(key, value)\n      }\n    }\n    for (var formKey in formData) {\n      if (formData.hasOwnProperty(formKey)) {\n        var formValue = formData[formKey]\n        if (formValue instanceof Array) {\n          for (var j = 0; j < formValue.length; j++) {\n            appendFormValue(formKey, formValue[j])\n          }\n        } else {\n          appendFormValue(formKey, formValue)\n        }\n      }\n    }\n  }\n\n  if (options.qs) {\n    self.qs(options.qs)\n  }\n\n  if (self.uri.path) {\n    self.path = self.uri.path\n  } else {\n    self.path = self.uri.pathname + (self.uri.search || '')\n  }\n\n  if (self.path.length === 0) {\n    self.path = '/'\n  }\n\n  // Auth must happen last in case signing is dependent on other headers\n  if (options.aws) {\n    self.aws(options.aws)\n  }\n\n  if (options.hawk) {\n    self.hawk(options.hawk)\n  }\n\n  if (options.httpSignature) {\n    self.httpSignature(options.httpSignature)\n  }\n\n  if (options.auth) {\n    if (Object.prototype.hasOwnProperty.call(options.auth, 'username')) {\n      options.auth.user = options.auth.username\n    }\n    if (Object.prototype.hasOwnProperty.call(options.auth, 'password')) {\n      options.auth.pass = options.auth.password\n    }\n\n    self.auth(\n      options.auth.user,\n      options.auth.pass,\n      options.auth.sendImmediately,\n      options.auth.bearer\n    )\n  }\n\n  if (self.gzip && !self.hasHeader('accept-encoding')) {\n    self.setHeader('accept-encoding', 'gzip, deflate')\n  }\n\n  if (self.uri.auth && !self.hasHeader('authorization')) {\n    var uriAuthPieces = self.uri.auth.split(':').map(function (item) { return self._qs.unescape(item) })\n    self.auth(uriAuthPieces[0], uriAuthPieces.slice(1).join(':'), true)\n  }\n\n  if (!self.tunnel && self.proxy && self.proxy.auth && !self.hasHeader('proxy-authorization')) {\n    var proxyAuthPieces = self.proxy.auth.split(':').map(function (item) { return self._qs.unescape(item) })\n    var authHeader = 'Basic ' + toBase64(proxyAuthPieces.join(':'))\n    self.setHeader('proxy-authorization', authHeader)\n  }\n\n  if (self.proxy && !self.tunnel) {\n    self.path = (self.uri.protocol + '//' + self.uri.host + self.path)\n  }\n\n  if (options.json) {\n    self.json(options.json)\n  }\n  if (options.multipart) {\n    self.multipart(options.multipart)\n  }\n\n  if (options.time) {\n    self.timing = true\n\n    // NOTE: elapsedTime is deprecated in favor of .timings\n    self.elapsedTime = self.elapsedTime || 0\n  }\n\n  function setContentLength () {\n    if (isTypedArray(self.body)) {\n      self.body = Buffer.from(self.body)\n    }\n\n    if (!self.hasHeader('content-length')) {\n      var length\n      if (typeof self.body === 'string') {\n        length = Buffer.byteLength(self.body)\n      } else if (Array.isArray(self.body)) {\n        length = self.body.reduce(function (a, b) { return a + b.length }, 0)\n      } else {\n        length = self.body.length\n      }\n\n      if (length) {\n        self.setHeader('content-length', length)\n      } else {\n        self.emit('error', new Error('Argument error, options.body.'))\n      }\n    }\n  }\n  if (self.body && !isstream(self.body)) {\n    setContentLength()\n  }\n\n  if (options.oauth) {\n    self.oauth(options.oauth)\n  } else if (self._oauth.params && self.hasHeader('authorization')) {\n    self.oauth(self._oauth.params)\n  }\n\n  var protocol = self.proxy && !self.tunnel ? self.proxy.protocol : self.uri.protocol\n  var defaultModules = {'http:': http, 'https:': https}\n  var httpModules = self.httpModules || {}\n\n  self.httpModule = httpModules[protocol] || defaultModules[protocol]\n\n  if (!self.httpModule) {\n    return self.emit('error', new Error('Invalid protocol: ' + protocol))\n  }\n\n  if (options.ca) {\n    self.ca = options.ca\n  }\n\n  if (!self.agent) {\n    if (options.agentOptions) {\n      self.agentOptions = options.agentOptions\n    }\n\n    if (options.agentClass) {\n      self.agentClass = options.agentClass\n    } else if (options.forever) {\n      var v = version()\n      // use ForeverAgent in node 0.10- only\n      if (v.major === 0 && v.minor <= 10) {\n        self.agentClass = protocol === 'http:' ? ForeverAgent : ForeverAgent.SSL\n      } else {\n        self.agentClass = self.httpModule.Agent\n        self.agentOptions = self.agentOptions || {}\n        self.agentOptions.keepAlive = true\n      }\n    } else {\n      self.agentClass = self.httpModule.Agent\n    }\n  }\n\n  if (self.pool === false) {\n    self.agent = false\n  } else {\n    self.agent = self.agent || self.getNewAgent()\n  }\n\n  self.on('pipe', function (src) {\n    if (self.ntick && self._started) {\n      self.emit('error', new Error('You cannot pipe to this stream after the outbound request has started.'))\n    }\n    self.src = src\n    if (isReadStream(src)) {\n      if (!self.hasHeader('content-type')) {\n        self.setHeader('content-type', mime.lookup(src.path))\n      }\n    } else {\n      if (src.headers) {\n        for (var i in src.headers) {\n          if (!self.hasHeader(i)) {\n            self.setHeader(i, src.headers[i])\n          }\n        }\n      }\n      if (self._json && !self.hasHeader('content-type')) {\n        self.setHeader('content-type', 'application/json')\n      }\n      if (src.method && !self.explicitMethod) {\n        self.method = src.method\n      }\n    }\n\n  // self.on('pipe', function () {\n  //   console.error('You have already piped to this stream. Pipeing twice is likely to break the request.')\n  // })\n  })\n\n  defer(function () {\n    if (self._aborted) {\n      return\n    }\n\n    var end = function () {\n      if (self._form) {\n        if (!self._auth.hasAuth) {\n          self._form.pipe(self)\n        } else if (self._auth.hasAuth && self._auth.sentAuth) {\n          self._form.pipe(self)\n        }\n      }\n      if (self._multipart && self._multipart.chunked) {\n        self._multipart.body.pipe(self)\n      }\n      if (self.body) {\n        if (isstream(self.body)) {\n          self.body.pipe(self)\n        } else {\n          setContentLength()\n          if (Array.isArray(self.body)) {\n            self.body.forEach(function (part) {\n              self.write(part)\n            })\n          } else {\n            self.write(self.body)\n          }\n          self.end()\n        }\n      } else if (self.requestBodyStream) {\n        console.warn('options.requestBodyStream is deprecated, please pass the request object to stream.pipe.')\n        self.requestBodyStream.pipe(self)\n      } else if (!self.src) {\n        if (self._auth.hasAuth && !self._auth.sentAuth) {\n          self.end()\n          return\n        }\n        if (self.method !== 'GET' && typeof self.method !== 'undefined') {\n          self.setHeader('content-length', 0)\n        }\n        self.end()\n      }\n    }\n\n    if (self._form && !self.hasHeader('content-length')) {\n      // Before ending the request, we had to compute the length of the whole form, asyncly\n      self.setHeader(self._form.getHeaders(), true)\n      self._form.getLength(function (err, length) {\n        if (!err && !isNaN(length)) {\n          self.setHeader('content-length', length)\n        }\n        end()\n      })\n    } else {\n      end()\n    }\n\n    self.ntick = true\n  })\n}\n\nRequest.prototype.getNewAgent = function () {\n  var self = this\n  var Agent = self.agentClass\n  var options = {}\n  if (self.agentOptions) {\n    for (var i in self.agentOptions) {\n      options[i] = self.agentOptions[i]\n    }\n  }\n  if (self.ca) {\n    options.ca = self.ca\n  }\n  if (self.ciphers) {\n    options.ciphers = self.ciphers\n  }\n  if (self.secureProtocol) {\n    options.secureProtocol = self.secureProtocol\n  }\n  if (self.secureOptions) {\n    options.secureOptions = self.secureOptions\n  }\n  if (typeof self.rejectUnauthorized !== 'undefined') {\n    options.rejectUnauthorized = self.rejectUnauthorized\n  }\n\n  if (self.cert && self.key) {\n    options.key = self.key\n    options.cert = self.cert\n  }\n\n  if (self.pfx) {\n    options.pfx = self.pfx\n  }\n\n  if (self.passphrase) {\n    options.passphrase = self.passphrase\n  }\n\n  var poolKey = ''\n\n  // different types of agents are in different pools\n  if (Agent !== self.httpModule.Agent) {\n    poolKey += Agent.name\n  }\n\n  // ca option is only relevant if proxy or destination are https\n  var proxy = self.proxy\n  if (typeof proxy === 'string') {\n    proxy = url.parse(proxy)\n  }\n  var isHttps = (proxy && proxy.protocol === 'https:') || this.uri.protocol === 'https:'\n\n  if (isHttps) {\n    if (options.ca) {\n      if (poolKey) {\n        poolKey += ':'\n      }\n      poolKey += options.ca\n    }\n\n    if (typeof options.rejectUnauthorized !== 'undefined') {\n      if (poolKey) {\n        poolKey += ':'\n      }\n      poolKey += options.rejectUnauthorized\n    }\n\n    if (options.cert) {\n      if (poolKey) {\n        poolKey += ':'\n      }\n      poolKey += options.cert.toString('ascii') + options.key.toString('ascii')\n    }\n\n    if (options.pfx) {\n      if (poolKey) {\n        poolKey += ':'\n      }\n      poolKey += options.pfx.toString('ascii')\n    }\n\n    if (options.ciphers) {\n      if (poolKey) {\n        poolKey += ':'\n      }\n      poolKey += options.ciphers\n    }\n\n    if (options.secureProtocol) {\n      if (poolKey) {\n        poolKey += ':'\n      }\n      poolKey += options.secureProtocol\n    }\n\n    if (options.secureOptions) {\n      if (poolKey) {\n        poolKey += ':'\n      }\n      poolKey += options.secureOptions\n    }\n  }\n\n  if (self.pool === globalPool && !poolKey && Object.keys(options).length === 0 && self.httpModule.globalAgent) {\n    // not doing anything special.  Use the globalAgent\n    return self.httpModule.globalAgent\n  }\n\n  // we're using a stored agent.  Make sure it's protocol-specific\n  poolKey = self.uri.protocol + poolKey\n\n  // generate a new agent for this setting if none yet exists\n  if (!self.pool[poolKey]) {\n    self.pool[poolKey] = new Agent(options)\n    // properly set maxSockets on new agents\n    if (self.pool.maxSockets) {\n      self.pool[poolKey].maxSockets = self.pool.maxSockets\n    }\n  }\n\n  return self.pool[poolKey]\n}\n\nRequest.prototype.start = function () {\n  // start() is called once we are ready to send the outgoing HTTP request.\n  // this is usually called on the first write(), end() or on nextTick()\n  var self = this\n\n  if (self.timing) {\n    // All timings will be relative to this request's startTime.  In order to do this,\n    // we need to capture the wall-clock start time (via Date), immediately followed\n    // by the high-resolution timer (via now()).  While these two won't be set\n    // at the _exact_ same time, they should be close enough to be able to calculate\n    // high-resolution, monotonically non-decreasing timestamps relative to startTime.\n    var startTime = new Date().getTime()\n    var startTimeNow = now()\n  }\n\n  if (self._aborted) {\n    return\n  }\n\n  self._started = true\n  self.method = self.method || 'GET'\n  self.href = self.uri.href\n\n  if (self.src && self.src.stat && self.src.stat.size && !self.hasHeader('content-length')) {\n    self.setHeader('content-length', self.src.stat.size)\n  }\n  if (self._aws) {\n    self.aws(self._aws, true)\n  }\n\n  // We have a method named auth, which is completely different from the http.request\n  // auth option.  If we don't remove it, we're gonna have a bad time.\n  var reqOptions = copy(self)\n  delete reqOptions.auth\n\n  debug('make request', self.uri.href)\n\n  // node v6.8.0 now supports a `timeout` value in `http.request()`, but we\n  // should delete it for now since we handle timeouts manually for better\n  // consistency with node versions before v6.8.0\n  delete reqOptions.timeout\n\n  try {\n    self.req = self.httpModule.request(reqOptions)\n  } catch (err) {\n    self.emit('error', err)\n    return\n  }\n\n  if (self.timing) {\n    self.startTime = startTime\n    self.startTimeNow = startTimeNow\n\n    // Timing values will all be relative to startTime (by comparing to startTimeNow\n    // so we have an accurate clock)\n    self.timings = {}\n  }\n\n  var timeout\n  if (self.timeout && !self.timeoutTimer) {\n    if (self.timeout < 0) {\n      timeout = 0\n    } else if (typeof self.timeout === 'number' && isFinite(self.timeout)) {\n      timeout = self.timeout\n    }\n  }\n\n  self.req.on('response', self.onRequestResponse.bind(self))\n  self.req.on('error', self.onRequestError.bind(self))\n  self.req.on('drain', function () {\n    self.emit('drain')\n  })\n\n  self.req.on('socket', function (socket) {\n    // `._connecting` was the old property which was made public in node v6.1.0\n    var isConnecting = socket._connecting || socket.connecting\n    if (self.timing) {\n      self.timings.socket = now() - self.startTimeNow\n\n      if (isConnecting) {\n        var onLookupTiming = function () {\n          self.timings.lookup = now() - self.startTimeNow\n        }\n\n        var onConnectTiming = function () {\n          self.timings.connect = now() - self.startTimeNow\n        }\n\n        socket.once('lookup', onLookupTiming)\n        socket.once('connect', onConnectTiming)\n\n        // clean up timing event listeners if needed on error\n        self.req.once('error', function () {\n          socket.removeListener('lookup', onLookupTiming)\n          socket.removeListener('connect', onConnectTiming)\n        })\n      }\n    }\n\n    var setReqTimeout = function () {\n      // This timeout sets the amount of time to wait *between* bytes sent\n      // from the server once connected.\n      //\n      // In particular, it's useful for erroring if the server fails to send\n      // data halfway through streaming a response.\n      self.req.setTimeout(timeout, function () {\n        if (self.req) {\n          self.abort()\n          var e = new Error('ESOCKETTIMEDOUT')\n          e.code = 'ESOCKETTIMEDOUT'\n          e.connect = false\n          self.emit('error', e)\n        }\n      })\n    }\n    if (timeout !== undefined) {\n      // Only start the connection timer if we're actually connecting a new\n      // socket, otherwise if we're already connected (because this is a\n      // keep-alive connection) do not bother. This is important since we won't\n      // get a 'connect' event for an already connected socket.\n      if (isConnecting) {\n        var onReqSockConnect = function () {\n          socket.removeListener('connect', onReqSockConnect)\n          self.clearTimeout()\n          setReqTimeout()\n        }\n\n        socket.on('connect', onReqSockConnect)\n\n        self.req.on('error', function (err) { // eslint-disable-line handle-callback-err\n          socket.removeListener('connect', onReqSockConnect)\n        })\n\n        // Set a timeout in memory - this block will throw if the server takes more\n        // than `timeout` to write the HTTP status and headers (corresponding to\n        // the on('response') event on the client). NB: this measures wall-clock\n        // time, not the time between bytes sent by the server.\n        self.timeoutTimer = setTimeout(function () {\n          socket.removeListener('connect', onReqSockConnect)\n          self.abort()\n          var e = new Error('ETIMEDOUT')\n          e.code = 'ETIMEDOUT'\n          e.connect = true\n          self.emit('error', e)\n        }, timeout)\n      } else {\n        // We're already connected\n        setReqTimeout()\n      }\n    }\n    self.emit('socket', socket)\n  })\n\n  self.emit('request', self.req)\n}\n\nRequest.prototype.onRequestError = function (error) {\n  var self = this\n  if (self._aborted) {\n    return\n  }\n  if (self.req && self.req._reusedSocket && error.code === 'ECONNRESET' &&\n    self.agent.addRequestNoreuse) {\n    self.agent = { addRequest: self.agent.addRequestNoreuse.bind(self.agent) }\n    self.start()\n    self.req.end()\n    return\n  }\n  self.clearTimeout()\n  self.emit('error', error)\n}\n\nRequest.prototype.onRequestResponse = function (response) {\n  var self = this\n\n  if (self.timing) {\n    self.timings.response = now() - self.startTimeNow\n  }\n\n  debug('onRequestResponse', self.uri.href, response.statusCode, response.headers)\n  response.on('end', function () {\n    if (self.timing) {\n      self.timings.end = now() - self.startTimeNow\n      response.timingStart = self.startTime\n\n      // fill in the blanks for any periods that didn't trigger, such as\n      // no lookup or connect due to keep alive\n      if (!self.timings.socket) {\n        self.timings.socket = 0\n      }\n      if (!self.timings.lookup) {\n        self.timings.lookup = self.timings.socket\n      }\n      if (!self.timings.connect) {\n        self.timings.connect = self.timings.lookup\n      }\n      if (!self.timings.response) {\n        self.timings.response = self.timings.connect\n      }\n\n      debug('elapsed time', self.timings.end)\n\n      // elapsedTime includes all redirects\n      self.elapsedTime += Math.round(self.timings.end)\n\n      // NOTE: elapsedTime is deprecated in favor of .timings\n      response.elapsedTime = self.elapsedTime\n\n      // timings is just for the final fetch\n      response.timings = self.timings\n\n      // pre-calculate phase timings as well\n      response.timingPhases = {\n        wait: self.timings.socket,\n        dns: self.timings.lookup - self.timings.socket,\n        tcp: self.timings.connect - self.timings.lookup,\n        firstByte: self.timings.response - self.timings.connect,\n        download: self.timings.end - self.timings.response,\n        total: self.timings.end\n      }\n    }\n    debug('response end', self.uri.href, response.statusCode, response.headers)\n  })\n\n  if (self._aborted) {\n    debug('aborted', self.uri.href)\n    response.resume()\n    return\n  }\n\n  self.response = response\n  response.request = self\n  response.toJSON = responseToJSON\n\n  // XXX This is different on 0.10, because SSL is strict by default\n  if (self.httpModule === https &&\n    self.strictSSL && (!response.hasOwnProperty('socket') ||\n    !response.socket.authorized)) {\n    debug('strict ssl error', self.uri.href)\n    var sslErr = response.hasOwnProperty('socket') ? response.socket.authorizationError : self.uri.href + ' does not support SSL'\n    self.emit('error', new Error('SSL Error: ' + sslErr))\n    return\n  }\n\n  // Save the original host before any redirect (if it changes, we need to\n  // remove any authorization headers).  Also remember the case of the header\n  // name because lots of broken servers expect Host instead of host and we\n  // want the caller to be able to specify this.\n  self.originalHost = self.getHeader('host')\n  if (!self.originalHostHeaderName) {\n    self.originalHostHeaderName = self.hasHeader('host')\n  }\n  if (self.setHost) {\n    self.removeHeader('host')\n  }\n  self.clearTimeout()\n\n  var targetCookieJar = (self._jar && self._jar.setCookie) ? self._jar : globalCookieJar\n  var addCookie = function (cookie) {\n    // set the cookie if it's domain in the href's domain.\n    try {\n      targetCookieJar.setCookie(cookie, self.uri.href, {ignoreError: true})\n    } catch (e) {\n      self.emit('error', e)\n    }\n  }\n\n  response.caseless = caseless(response.headers)\n\n  if (response.caseless.has('set-cookie') && (!self._disableCookies)) {\n    var headerName = response.caseless.has('set-cookie')\n    if (Array.isArray(response.headers[headerName])) {\n      response.headers[headerName].forEach(addCookie)\n    } else {\n      addCookie(response.headers[headerName])\n    }\n  }\n\n  if (self._redirect.onResponse(response)) {\n    return // Ignore the rest of the response\n  } else {\n    // Be a good stream and emit end when the response is finished.\n    // Hack to emit end on close because of a core bug that never fires end\n    response.on('close', function () {\n      if (!self._ended) {\n        self.response.emit('end')\n      }\n    })\n\n    response.once('end', function () {\n      self._ended = true\n    })\n\n    var noBody = function (code) {\n      return (\n        self.method === 'HEAD' ||\n        // Informational\n        (code >= 100 && code < 200) ||\n        // No Content\n        code === 204 ||\n        // Not Modified\n        code === 304\n      )\n    }\n\n    var responseContent\n    if (self.gzip && !noBody(response.statusCode)) {\n      var contentEncoding = response.headers['content-encoding'] || 'identity'\n      contentEncoding = contentEncoding.trim().toLowerCase()\n\n      // Be more lenient with decoding compressed responses, since (very rarely)\n      // servers send slightly invalid gzip responses that are still accepted\n      // by common browsers.\n      // Always using Z_SYNC_FLUSH is what cURL does.\n      var zlibOptions = {\n        flush: zlib.Z_SYNC_FLUSH,\n        finishFlush: zlib.Z_SYNC_FLUSH\n      }\n\n      if (contentEncoding === 'gzip') {\n        responseContent = zlib.createGunzip(zlibOptions)\n        response.pipe(responseContent)\n      } else if (contentEncoding === 'deflate') {\n        responseContent = zlib.createInflate(zlibOptions)\n        response.pipe(responseContent)\n      } else {\n        // Since previous versions didn't check for Content-Encoding header,\n        // ignore any invalid values to preserve backwards-compatibility\n        if (contentEncoding !== 'identity') {\n          debug('ignoring unrecognized Content-Encoding ' + contentEncoding)\n        }\n        responseContent = response\n      }\n    } else {\n      responseContent = response\n    }\n\n    if (self.encoding) {\n      if (self.dests.length !== 0) {\n        console.error('Ignoring encoding parameter as this stream is being piped to another stream which makes the encoding option invalid.')\n      } else {\n        responseContent.setEncoding(self.encoding)\n      }\n    }\n\n    if (self._paused) {\n      responseContent.pause()\n    }\n\n    self.responseContent = responseContent\n\n    self.emit('response', response)\n\n    self.dests.forEach(function (dest) {\n      self.pipeDest(dest)\n    })\n\n    responseContent.on('data', function (chunk) {\n      if (self.timing && !self.responseStarted) {\n        self.responseStartTime = (new Date()).getTime()\n\n        // NOTE: responseStartTime is deprecated in favor of .timings\n        response.responseStartTime = self.responseStartTime\n      }\n      self._destdata = true\n      self.emit('data', chunk)\n    })\n    responseContent.once('end', function (chunk) {\n      self.emit('end', chunk)\n    })\n    responseContent.on('error', function (error) {\n      self.emit('error', error)\n    })\n    responseContent.on('close', function () { self.emit('close') })\n\n    if (self.callback) {\n      self.readResponseBody(response)\n    } else { // if no callback\n      self.on('end', function () {\n        if (self._aborted) {\n          debug('aborted', self.uri.href)\n          return\n        }\n        self.emit('complete', response)\n      })\n    }\n  }\n  debug('finish init function', self.uri.href)\n}\n\nRequest.prototype.readResponseBody = function (response) {\n  var self = this\n  debug(\"reading response's body\")\n  var buffers = []\n  var bufferLength = 0\n  var strings = []\n\n  self.on('data', function (chunk) {\n    if (!Buffer.isBuffer(chunk)) {\n      strings.push(chunk)\n    } else if (chunk.length) {\n      bufferLength += chunk.length\n      buffers.push(chunk)\n    }\n  })\n  self.on('end', function () {\n    debug('end event', self.uri.href)\n    if (self._aborted) {\n      debug('aborted', self.uri.href)\n      // `buffer` is defined in the parent scope and used in a closure it exists for the life of the request.\n      // This can lead to leaky behavior if the user retains a reference to the request object.\n      buffers = []\n      bufferLength = 0\n      return\n    }\n\n    if (bufferLength) {\n      debug('has body', self.uri.href, bufferLength)\n      response.body = Buffer.concat(buffers, bufferLength)\n      if (self.encoding !== null) {\n        response.body = response.body.toString(self.encoding)\n      }\n      // `buffer` is defined in the parent scope and used in a closure it exists for the life of the Request.\n      // This can lead to leaky behavior if the user retains a reference to the request object.\n      buffers = []\n      bufferLength = 0\n    } else if (strings.length) {\n      // The UTF8 BOM [0xEF,0xBB,0xBF] is converted to [0xFE,0xFF] in the JS UTC16/UCS2 representation.\n      // Strip this value out when the encoding is set to 'utf8', as upstream consumers won't expect it and it breaks JSON.parse().\n      if (self.encoding === 'utf8' && strings[0].length > 0 && strings[0][0] === '\\uFEFF') {\n        strings[0] = strings[0].substring(1)\n      }\n      response.body = strings.join('')\n    }\n\n    if (self._json) {\n      try {\n        response.body = JSON.parse(response.body, self._jsonReviver)\n      } catch (e) {\n        debug('invalid JSON received', self.uri.href)\n      }\n    }\n    debug('emitting complete', self.uri.href)\n    if (typeof response.body === 'undefined' && !self._json) {\n      response.body = self.encoding === null ? Buffer.alloc(0) : ''\n    }\n    self.emit('complete', response, response.body)\n  })\n}\n\nRequest.prototype.abort = function () {\n  var self = this\n  self._aborted = true\n\n  if (self.req) {\n    self.req.abort()\n  } else if (self.response) {\n    self.response.destroy()\n  }\n\n  self.clearTimeout()\n  self.emit('abort')\n}\n\nRequest.prototype.pipeDest = function (dest) {\n  var self = this\n  var response = self.response\n  // Called after the response is received\n  if (dest.headers && !dest.headersSent) {\n    if (response.caseless.has('content-type')) {\n      var ctname = response.caseless.has('content-type')\n      if (dest.setHeader) {\n        dest.setHeader(ctname, response.headers[ctname])\n      } else {\n        dest.headers[ctname] = response.headers[ctname]\n      }\n    }\n\n    if (response.caseless.has('content-length')) {\n      var clname = response.caseless.has('content-length')\n      if (dest.setHeader) {\n        dest.setHeader(clname, response.headers[clname])\n      } else {\n        dest.headers[clname] = response.headers[clname]\n      }\n    }\n  }\n  if (dest.setHeader && !dest.headersSent) {\n    for (var i in response.headers) {\n      // If the response content is being decoded, the Content-Encoding header\n      // of the response doesn't represent the piped content, so don't pass it.\n      if (!self.gzip || i !== 'content-encoding') {\n        dest.setHeader(i, response.headers[i])\n      }\n    }\n    dest.statusCode = response.statusCode\n  }\n  if (self.pipefilter) {\n    self.pipefilter(response, dest)\n  }\n}\n\nRequest.prototype.qs = function (q, clobber) {\n  var self = this\n  var base\n  if (!clobber && self.uri.query) {\n    base = self._qs.parse(self.uri.query)\n  } else {\n    base = {}\n  }\n\n  for (var i in q) {\n    base[i] = q[i]\n  }\n\n  var qs = self._qs.stringify(base)\n\n  if (qs === '') {\n    return self\n  }\n\n  self.uri = url.parse(self.uri.href.split('?')[0] + '?' + qs)\n  self.url = self.uri\n  self.path = self.uri.path\n\n  if (self.uri.host === 'unix') {\n    self.enableUnixSocket()\n  }\n\n  return self\n}\nRequest.prototype.form = function (form) {\n  var self = this\n  if (form) {\n    if (!/^application\\/x-www-form-urlencoded\\b/.test(self.getHeader('content-type'))) {\n      self.setHeader('content-type', 'application/x-www-form-urlencoded')\n    }\n    self.body = (typeof form === 'string')\n      ? self._qs.rfc3986(form.toString('utf8'))\n      : self._qs.stringify(form).toString('utf8')\n    return self\n  }\n  // create form-data object\n  self._form = new FormData()\n  self._form.on('error', function (err) {\n    err.message = 'form-data: ' + err.message\n    self.emit('error', err)\n    self.abort()\n  })\n  return self._form\n}\nRequest.prototype.multipart = function (multipart) {\n  var self = this\n\n  self._multipart.onRequest(multipart)\n\n  if (!self._multipart.chunked) {\n    self.body = self._multipart.body\n  }\n\n  return self\n}\nRequest.prototype.json = function (val) {\n  var self = this\n\n  if (!self.hasHeader('accept')) {\n    self.setHeader('accept', 'application/json')\n  }\n\n  if (typeof self.jsonReplacer === 'function') {\n    self._jsonReplacer = self.jsonReplacer\n  }\n\n  self._json = true\n  if (typeof val === 'boolean') {\n    if (self.body !== undefined) {\n      if (!/^application\\/x-www-form-urlencoded\\b/.test(self.getHeader('content-type'))) {\n        self.body = safeStringify(self.body, self._jsonReplacer)\n      } else {\n        self.body = self._qs.rfc3986(self.body)\n      }\n      if (!self.hasHeader('content-type')) {\n        self.setHeader('content-type', 'application/json')\n      }\n    }\n  } else {\n    self.body = safeStringify(val, self._jsonReplacer)\n    if (!self.hasHeader('content-type')) {\n      self.setHeader('content-type', 'application/json')\n    }\n  }\n\n  if (typeof self.jsonReviver === 'function') {\n    self._jsonReviver = self.jsonReviver\n  }\n\n  return self\n}\nRequest.prototype.getHeader = function (name, headers) {\n  var self = this\n  var result, re, match\n  if (!headers) {\n    headers = self.headers\n  }\n  Object.keys(headers).forEach(function (key) {\n    if (key.length !== name.length) {\n      return\n    }\n    re = new RegExp(name, 'i')\n    match = key.match(re)\n    if (match) {\n      result = headers[key]\n    }\n  })\n  return result\n}\nRequest.prototype.enableUnixSocket = function () {\n  // Get the socket & request paths from the URL\n  var unixParts = this.uri.path.split(':')\n  var host = unixParts[0]\n  var path = unixParts[1]\n  // Apply unix properties to request\n  this.socketPath = host\n  this.uri.pathname = path\n  this.uri.path = path\n  this.uri.host = host\n  this.uri.hostname = host\n  this.uri.isUnix = true\n}\n\nRequest.prototype.auth = function (user, pass, sendImmediately, bearer) {\n  var self = this\n\n  self._auth.onRequest(user, pass, sendImmediately, bearer)\n\n  return self\n}\nRequest.prototype.aws = function (opts, now) {\n  var self = this\n\n  if (!now) {\n    self._aws = opts\n    return self\n  }\n\n  if (opts.sign_version === 4 || opts.sign_version === '4') {\n    // use aws4\n    var options = {\n      host: self.uri.host,\n      path: self.uri.path,\n      method: self.method,\n      headers: self.headers,\n      body: self.body\n    }\n    if (opts.service) {\n      options.service = opts.service\n    }\n    var signRes = aws4.sign(options, {\n      accessKeyId: opts.key,\n      secretAccessKey: opts.secret,\n      sessionToken: opts.session\n    })\n    self.setHeader('authorization', signRes.headers.Authorization)\n    self.setHeader('x-amz-date', signRes.headers['X-Amz-Date'])\n    if (signRes.headers['X-Amz-Security-Token']) {\n      self.setHeader('x-amz-security-token', signRes.headers['X-Amz-Security-Token'])\n    }\n  } else {\n    // default: use aws-sign2\n    var date = new Date()\n    self.setHeader('date', date.toUTCString())\n    var auth = {\n      key: opts.key,\n      secret: opts.secret,\n      verb: self.method.toUpperCase(),\n      date: date,\n      contentType: self.getHeader('content-type') || '',\n      md5: self.getHeader('content-md5') || '',\n      amazonHeaders: aws2.canonicalizeHeaders(self.headers)\n    }\n    var path = self.uri.path\n    if (opts.bucket && path) {\n      auth.resource = '/' + opts.bucket + path\n    } else if (opts.bucket && !path) {\n      auth.resource = '/' + opts.bucket\n    } else if (!opts.bucket && path) {\n      auth.resource = path\n    } else if (!opts.bucket && !path) {\n      auth.resource = '/'\n    }\n    auth.resource = aws2.canonicalizeResource(auth.resource)\n    self.setHeader('authorization', aws2.authorization(auth))\n  }\n\n  return self\n}\nRequest.prototype.httpSignature = function (opts) {\n  var self = this\n  httpSignature.signRequest({\n    getHeader: function (header) {\n      return self.getHeader(header, self.headers)\n    },\n    setHeader: function (header, value) {\n      self.setHeader(header, value)\n    },\n    method: self.method,\n    path: self.path\n  }, opts)\n  debug('httpSignature authorization', self.getHeader('authorization'))\n\n  return self\n}\nRequest.prototype.hawk = function (opts) {\n  var self = this\n  self.setHeader('Authorization', hawk.header(self.uri, self.method, opts))\n}\nRequest.prototype.oauth = function (_oauth) {\n  var self = this\n\n  self._oauth.onRequest(_oauth)\n\n  return self\n}\n\nRequest.prototype.jar = function (jar) {\n  var self = this\n  var cookies\n\n  if (self._redirect.redirectsFollowed === 0) {\n    self.originalCookieHeader = self.getHeader('cookie')\n  }\n\n  if (!jar) {\n    // disable cookies\n    cookies = false\n    self._disableCookies = true\n  } else {\n    var targetCookieJar = jar.getCookieString ? jar : globalCookieJar\n    var urihref = self.uri.href\n    // fetch cookie in the Specified host\n    if (targetCookieJar) {\n      cookies = targetCookieJar.getCookieString(urihref)\n    }\n  }\n\n  // if need cookie and cookie is not empty\n  if (cookies && cookies.length) {\n    if (self.originalCookieHeader) {\n      // Don't overwrite existing Cookie header\n      self.setHeader('cookie', self.originalCookieHeader + '; ' + cookies)\n    } else {\n      self.setHeader('cookie', cookies)\n    }\n  }\n  self._jar = jar\n  return self\n}\n\n// Stream API\nRequest.prototype.pipe = function (dest, opts) {\n  var self = this\n\n  if (self.response) {\n    if (self._destdata) {\n      self.emit('error', new Error('You cannot pipe after data has been emitted from the response.'))\n    } else if (self._ended) {\n      self.emit('error', new Error('You cannot pipe after the response has been ended.'))\n    } else {\n      stream.Stream.prototype.pipe.call(self, dest, opts)\n      self.pipeDest(dest)\n      return dest\n    }\n  } else {\n    self.dests.push(dest)\n    stream.Stream.prototype.pipe.call(self, dest, opts)\n    return dest\n  }\n}\nRequest.prototype.write = function () {\n  var self = this\n  if (self._aborted) { return }\n\n  if (!self._started) {\n    self.start()\n  }\n  if (self.req) {\n    return self.req.write.apply(self.req, arguments)\n  }\n}\nRequest.prototype.end = function (chunk) {\n  var self = this\n  if (self._aborted) { return }\n\n  if (chunk) {\n    self.write(chunk)\n  }\n  if (!self._started) {\n    self.start()\n  }\n  if (self.req) {\n    self.req.end()\n  }\n}\nRequest.prototype.pause = function () {\n  var self = this\n  if (!self.responseContent) {\n    self._paused = true\n  } else {\n    self.responseContent.pause.apply(self.responseContent, arguments)\n  }\n}\nRequest.prototype.resume = function () {\n  var self = this\n  if (!self.responseContent) {\n    self._paused = false\n  } else {\n    self.responseContent.resume.apply(self.responseContent, arguments)\n  }\n}\nRequest.prototype.destroy = function () {\n  var self = this\n  this.clearTimeout()\n  if (!self._ended) {\n    self.end()\n  } else if (self.response) {\n    self.response.destroy()\n  }\n}\n\nRequest.prototype.clearTimeout = function () {\n  if (this.timeoutTimer) {\n    clearTimeout(this.timeoutTimer)\n    this.timeoutTimer = null\n  }\n}\n\nRequest.defaultProxyHeaderWhiteList =\n  Tunnel.defaultProxyHeaderWhiteList.slice()\n\nRequest.defaultProxyHeaderExclusiveList =\n  Tunnel.defaultProxyHeaderExclusiveList.slice()\n\n// Exports\n\nRequest.prototype.toJSON = requestToJSON\nmodule.exports = Request\n","module.exports = require('events').EventEmitter;\n","'use strict';\n\n/*<replacement>*/\n\nvar pna = require('process-nextick-args');\n/*</replacement>*/\n\n// undocumented cb() API, needed for core, not for public API\nfunction destroy(err, cb) {\n  var _this = this;\n\n  var readableDestroyed = this._readableState && this._readableState.destroyed;\n  var writableDestroyed = this._writableState && this._writableState.destroyed;\n\n  if (readableDestroyed || writableDestroyed) {\n    if (cb) {\n      cb(err);\n    } else if (err && (!this._writableState || !this._writableState.errorEmitted)) {\n      pna.nextTick(emitErrorNT, this, err);\n    }\n    return this;\n  }\n\n  // we set destroyed to true before firing error callbacks in order\n  // to make it re-entrance safe in case destroy() is called within callbacks\n\n  if (this._readableState) {\n    this._readableState.destroyed = true;\n  }\n\n  // if this is a duplex stream mark the writable part as destroyed as well\n  if (this._writableState) {\n    this._writableState.destroyed = true;\n  }\n\n  this._destroy(err || null, function (err) {\n    if (!cb && err) {\n      pna.nextTick(emitErrorNT, _this, err);\n      if (_this._writableState) {\n        _this._writableState.errorEmitted = true;\n      }\n    } else if (cb) {\n      cb(err);\n    }\n  });\n\n  return this;\n}\n\nfunction undestroy() {\n  if (this._readableState) {\n    this._readableState.destroyed = false;\n    this._readableState.reading = false;\n    this._readableState.ended = false;\n    this._readableState.endEmitted = false;\n  }\n\n  if (this._writableState) {\n    this._writableState.destroyed = false;\n    this._writableState.ended = false;\n    this._writableState.ending = false;\n    this._writableState.finished = false;\n    this._writableState.errorEmitted = false;\n  }\n}\n\nfunction emitErrorNT(self, err) {\n  self.emit('error', err);\n}\n\nmodule.exports = {\n  destroy: destroy,\n  undestroy: undestroy\n};","'use strict'\n\nvar crypto = require('crypto')\n\nfunction randomString (size) {\n  var bits = (size + 1) * 6\n  var buffer = crypto.randomBytes(Math.ceil(bits / 8))\n  var string = buffer.toString('base64').replace(/\\+/g, '-').replace(/\\//g, '_').replace(/=/g, '')\n  return string.slice(0, size)\n}\n\nfunction calculatePayloadHash (payload, algorithm, contentType) {\n  var hash = crypto.createHash(algorithm)\n  hash.update('hawk.1.payload\\n')\n  hash.update((contentType ? contentType.split(';')[0].trim().toLowerCase() : '') + '\\n')\n  hash.update(payload || '')\n  hash.update('\\n')\n  return hash.digest('base64')\n}\n\nexports.calculateMac = function (credentials, opts) {\n  var normalized = 'hawk.1.header\\n' +\n    opts.ts + '\\n' +\n    opts.nonce + '\\n' +\n    (opts.method || '').toUpperCase() + '\\n' +\n    opts.resource + '\\n' +\n    opts.host.toLowerCase() + '\\n' +\n    opts.port + '\\n' +\n    (opts.hash || '') + '\\n'\n\n  if (opts.ext) {\n    normalized = normalized + opts.ext.replace('\\\\', '\\\\\\\\').replace('\\n', '\\\\n')\n  }\n\n  normalized = normalized + '\\n'\n\n  if (opts.app) {\n    normalized = normalized + opts.app + '\\n' + (opts.dlg || '') + '\\n'\n  }\n\n  var hmac = crypto.createHmac(credentials.algorithm, credentials.key).update(normalized)\n  var digest = hmac.digest('base64')\n  return digest\n}\n\nexports.header = function (uri, method, opts) {\n  var timestamp = opts.timestamp || Math.floor((Date.now() + (opts.localtimeOffsetMsec || 0)) / 1000)\n  var credentials = opts.credentials\n  if (!credentials || !credentials.id || !credentials.key || !credentials.algorithm) {\n    return ''\n  }\n\n  if (['sha1', 'sha256'].indexOf(credentials.algorithm) === -1) {\n    return ''\n  }\n\n  var artifacts = {\n    ts: timestamp,\n    nonce: opts.nonce || randomString(6),\n    method: method,\n    resource: uri.pathname + (uri.search || ''),\n    host: uri.hostname,\n    port: uri.port || (uri.protocol === 'http:' ? 80 : 443),\n    hash: opts.hash,\n    ext: opts.ext,\n    app: opts.app,\n    dlg: opts.dlg\n  }\n\n  if (!artifacts.hash && (opts.payload || opts.payload === '')) {\n    artifacts.hash = calculatePayloadHash(opts.payload, credentials.algorithm, opts.contentType)\n  }\n\n  var mac = exports.calculateMac(credentials, artifacts)\n\n  var hasExt = artifacts.ext !== null && artifacts.ext !== undefined && artifacts.ext !== ''\n  var header = 'Hawk id=\"' + credentials.id +\n    '\", ts=\"' + artifacts.ts +\n    '\", nonce=\"' + artifacts.nonce +\n    (artifacts.hash ? '\", hash=\"' + artifacts.hash : '') +\n    (hasExt ? '\", ext=\"' + artifacts.ext.replace(/\\\\/g, '\\\\\\\\').replace(/\"/g, '\\\\\"') : '') +\n    '\", mac=\"' + mac + '\"'\n\n  if (artifacts.app) {\n    header = header + ', app=\"' + artifacts.app + (artifacts.dlg ? '\", dlg=\"' + artifacts.dlg : '') + '\"'\n  }\n\n  return header\n}\n","'use strict';\n\nfunction _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError(\"Cannot call a class as a function\"); } }\n\nvar Buffer = require('safe-buffer').Buffer;\nvar util = require('util');\n\nfunction copyBuffer(src, target, offset) {\n  src.copy(target, offset);\n}\n\nmodule.exports = function () {\n  function BufferList() {\n    _classCallCheck(this, BufferList);\n\n    this.head = null;\n    this.tail = null;\n    this.length = 0;\n  }\n\n  BufferList.prototype.push = function push(v) {\n    var entry = { data: v, next: null };\n    if (this.length > 0) this.tail.next = entry;else this.head = entry;\n    this.tail = entry;\n    ++this.length;\n  };\n\n  BufferList.prototype.unshift = function unshift(v) {\n    var entry = { data: v, next: this.head };\n    if (this.length === 0) this.tail = entry;\n    this.head = entry;\n    ++this.length;\n  };\n\n  BufferList.prototype.shift = function shift() {\n    if (this.length === 0) return;\n    var ret = this.head.data;\n    if (this.length === 1) this.head = this.tail = null;else this.head = this.head.next;\n    --this.length;\n    return ret;\n  };\n\n  BufferList.prototype.clear = function clear() {\n    this.head = this.tail = null;\n    this.length = 0;\n  };\n\n  BufferList.prototype.join = function join(s) {\n    if (this.length === 0) return '';\n    var p = this.head;\n    var ret = '' + p.data;\n    while (p = p.next) {\n      ret += s + p.data;\n    }return ret;\n  };\n\n  BufferList.prototype.concat = function concat(n) {\n    if (this.length === 0) return Buffer.alloc(0);\n    if (this.length === 1) return this.head.data;\n    var ret = Buffer.allocUnsafe(n >>> 0);\n    var p = this.head;\n    var i = 0;\n    while (p) {\n      copyBuffer(p.data, ret, i);\n      i += p.data.length;\n      p = p.next;\n    }\n    return ret;\n  };\n\n  return BufferList;\n}();\n\nif (util && util.inspect && util.inspect.custom) {\n  module.exports.prototype[util.inspect.custom] = function () {\n    var obj = util.inspect({ length: this.length });\n    return this.constructor.name + ' ' + obj;\n  };\n}","'use strict'\n\nfunction oldBrowser () {\n  throw new Error('secure random number generation not supported by this browser\\nuse chrome, FireFox or Internet Explorer 11')\n}\nvar safeBuffer = require('safe-buffer')\nvar randombytes = require('randombytes')\nvar Buffer = safeBuffer.Buffer\nvar kBufferMaxLength = safeBuffer.kMaxLength\nvar crypto = global.crypto || global.msCrypto\nvar kMaxUint32 = Math.pow(2, 32) - 1\nfunction assertOffset (offset, length) {\n  if (typeof offset !== 'number' || offset !== offset) { // eslint-disable-line no-self-compare\n    throw new TypeError('offset must be a number')\n  }\n\n  if (offset > kMaxUint32 || offset < 0) {\n    throw new TypeError('offset must be a uint32')\n  }\n\n  if (offset > kBufferMaxLength || offset > length) {\n    throw new RangeError('offset out of range')\n  }\n}\n\nfunction assertSize (size, offset, length) {\n  if (typeof size !== 'number' || size !== size) { // eslint-disable-line no-self-compare\n    throw new TypeError('size must be a number')\n  }\n\n  if (size > kMaxUint32 || size < 0) {\n    throw new TypeError('size must be a uint32')\n  }\n\n  if (size + offset > length || size > kBufferMaxLength) {\n    throw new RangeError('buffer too small')\n  }\n}\nif ((crypto && crypto.getRandomValues) || !process.browser) {\n  exports.randomFill = randomFill\n  exports.randomFillSync = randomFillSync\n} else {\n  exports.randomFill = oldBrowser\n  exports.randomFillSync = oldBrowser\n}\nfunction randomFill (buf, offset, size, cb) {\n  if (!Buffer.isBuffer(buf) && !(buf instanceof global.Uint8Array)) {\n    throw new TypeError('\"buf\" argument must be a Buffer or Uint8Array')\n  }\n\n  if (typeof offset === 'function') {\n    cb = offset\n    offset = 0\n    size = buf.length\n  } else if (typeof size === 'function') {\n    cb = size\n    size = buf.length - offset\n  } else if (typeof cb !== 'function') {\n    throw new TypeError('\"cb\" argument must be a function')\n  }\n  assertOffset(offset, buf.length)\n  assertSize(size, offset, buf.length)\n  return actualFill(buf, offset, size, cb)\n}\n\nfunction actualFill (buf, offset, size, cb) {\n  if (process.browser) {\n    var ourBuf = buf.buffer\n    var uint = new Uint8Array(ourBuf, offset, size)\n    crypto.getRandomValues(uint)\n    if (cb) {\n      process.nextTick(function () {\n        cb(null, buf)\n      })\n      return\n    }\n    return buf\n  }\n  if (cb) {\n    randombytes(size, function (err, bytes) {\n      if (err) {\n        return cb(err)\n      }\n      bytes.copy(buf, offset)\n      cb(null, buf)\n    })\n    return\n  }\n  var bytes = randombytes(size)\n  bytes.copy(buf, offset)\n  return buf\n}\nfunction randomFillSync (buf, offset, size) {\n  if (typeof offset === 'undefined') {\n    offset = 0\n  }\n  if (!Buffer.isBuffer(buf) && !(buf instanceof global.Uint8Array)) {\n    throw new TypeError('\"buf\" argument must be a Buffer or Uint8Array')\n  }\n\n  assertOffset(offset, buf.length)\n\n  if (size === undefined) size = buf.length - offset\n\n  assertSize(size, offset, buf.length)\n\n  return actualFill(buf, offset, size)\n}\n","// Copyright Joyent, Inc. and other Node contributors.\n//\n// Permission is hereby granted, free of charge, to any person obtaining a\n// copy of this software and associated documentation files (the\n// \"Software\"), to deal in the Software without restriction, including\n// without limitation the rights to use, copy, modify, merge, publish,\n// distribute, sublicense, and/or sell copies of the Software, and to permit\n// persons to whom the Software is furnished to do so, subject to the\n// following conditions:\n//\n// The above copyright notice and this permission notice shall be included\n// in all copies or substantial portions of the Software.\n//\n// THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS\n// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF\n// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN\n// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,\n// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR\n// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE\n// USE OR OTHER DEALINGS IN THE SOFTWARE.\n\n// a passthrough stream.\n// basically just the most minimal sort of Transform stream.\n// Every written chunk gets output as-is.\n\n'use strict';\n\nmodule.exports = PassThrough;\n\nvar Transform = require('./_stream_transform');\n\n/*<replacement>*/\nvar util = Object.create(require('core-util-is'));\nutil.inherits = require('inherits');\n/*</replacement>*/\n\nutil.inherits(PassThrough, Transform);\n\nfunction PassThrough(options) {\n  if (!(this instanceof PassThrough)) return new PassThrough(options);\n\n  Transform.call(this, options);\n}\n\nPassThrough.prototype._transform = function (chunk, encoding, cb) {\n  cb(null, chunk);\n};","// Copyright Joyent, Inc. and other Node contributors.\n//\n// Permission is hereby granted, free of charge, to any person obtaining a\n// copy of this software and associated documentation files (the\n// \"Software\"), to deal in the Software without restriction, including\n// without limitation the rights to use, copy, modify, merge, publish,\n// distribute, sublicense, and/or sell copies of the Software, and to permit\n// persons to whom the Software is furnished to do so, subject to the\n// following conditions:\n//\n// The above copyright notice and this permission notice shall be included\n// in all copies or substantial portions of the Software.\n//\n// THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS\n// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF\n// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN\n// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,\n// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR\n// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE\n// USE OR OTHER DEALINGS IN THE SOFTWARE.\n\n'use strict';\n\n// If obj.hasOwnProperty has been overridden, then calling\n// obj.hasOwnProperty(prop) will break.\n// See: https://github.com/joyent/node/issues/1707\nfunction hasOwnProperty(obj, prop) {\n  return Object.prototype.hasOwnProperty.call(obj, prop);\n}\n\nmodule.exports = function(qs, sep, eq, options) {\n  sep = sep || '&';\n  eq = eq || '=';\n  var obj = {};\n\n  if (typeof qs !== 'string' || qs.length === 0) {\n    return obj;\n  }\n\n  var regexp = /\\+/g;\n  qs = qs.split(sep);\n\n  var maxKeys = 1000;\n  if (options && typeof options.maxKeys === 'number') {\n    maxKeys = options.maxKeys;\n  }\n\n  var len = qs.length;\n  // maxKeys <= 0 means that we should not limit keys count\n  if (maxKeys > 0 && len > maxKeys) {\n    len = maxKeys;\n  }\n\n  for (var i = 0; i < len; ++i) {\n    var x = qs[i].replace(regexp, '%20'),\n        idx = x.indexOf(eq),\n        kstr, vstr, k, v;\n\n    if (idx >= 0) {\n      kstr = x.substr(0, idx);\n      vstr = x.substr(idx + 1);\n    } else {\n      kstr = x;\n      vstr = '';\n    }\n\n    k = decodeURIComponent(kstr);\n    v = decodeURIComponent(vstr);\n\n    if (!hasOwnProperty(obj, k)) {\n      obj[k] = v;\n    } else if (isArray(obj[k])) {\n      obj[k].push(v);\n    } else {\n      obj[k] = [obj[k], v];\n    }\n  }\n\n  return obj;\n};\n\nvar isArray = Array.isArray || function (xs) {\n  return Object.prototype.toString.call(xs) === '[object Array]';\n};\n","'use strict'\n\nvar caseless = require('caseless')\nvar uuid = require('uuid/v4')\nvar helpers = require('./helpers')\n\nvar md5 = helpers.md5\nvar toBase64 = helpers.toBase64\n\nfunction Auth (request) {\n  // define all public properties here\n  this.request = request\n  this.hasAuth = false\n  this.sentAuth = false\n  this.bearerToken = null\n  this.user = null\n  this.pass = null\n}\n\nAuth.prototype.basic = function (user, pass, sendImmediately) {\n  var self = this\n  if (typeof user !== 'string' || (pass !== undefined && typeof pass !== 'string')) {\n    self.request.emit('error', new Error('auth() received invalid user or password'))\n  }\n  self.user = user\n  self.pass = pass\n  self.hasAuth = true\n  var header = user + ':' + (pass || '')\n  if (sendImmediately || typeof sendImmediately === 'undefined') {\n    var authHeader = 'Basic ' + toBase64(header)\n    self.sentAuth = true\n    return authHeader\n  }\n}\n\nAuth.prototype.bearer = function (bearer, sendImmediately) {\n  var self = this\n  self.bearerToken = bearer\n  self.hasAuth = true\n  if (sendImmediately || typeof sendImmediately === 'undefined') {\n    if (typeof bearer === 'function') {\n      bearer = bearer()\n    }\n    var authHeader = 'Bearer ' + (bearer || '')\n    self.sentAuth = true\n    return authHeader\n  }\n}\n\nAuth.prototype.digest = function (method, path, authHeader) {\n  // TODO: More complete implementation of RFC 2617.\n  //   - handle challenge.domain\n  //   - support qop=\"auth-int\" only\n  //   - handle Authentication-Info (not necessarily?)\n  //   - check challenge.stale (not necessarily?)\n  //   - increase nc (not necessarily?)\n  // For reference:\n  // http://tools.ietf.org/html/rfc2617#section-3\n  // https://github.com/bagder/curl/blob/master/lib/http_digest.c\n\n  var self = this\n\n  var challenge = {}\n  var re = /([a-z0-9_-]+)=(?:\"([^\"]+)\"|([a-z0-9_-]+))/gi\n  while (true) {\n    var match = re.exec(authHeader)\n    if (!match) {\n      break\n    }\n    challenge[match[1]] = match[2] || match[3]\n  }\n\n  /**\n   * RFC 2617: handle both MD5 and MD5-sess algorithms.\n   *\n   * If the algorithm directive's value is \"MD5\" or unspecified, then HA1 is\n   *   HA1=MD5(username:realm:password)\n   * If the algorithm directive's value is \"MD5-sess\", then HA1 is\n   *   HA1=MD5(MD5(username:realm:password):nonce:cnonce)\n   */\n  var ha1Compute = function (algorithm, user, realm, pass, nonce, cnonce) {\n    var ha1 = md5(user + ':' + realm + ':' + pass)\n    if (algorithm && algorithm.toLowerCase() === 'md5-sess') {\n      return md5(ha1 + ':' + nonce + ':' + cnonce)\n    } else {\n      return ha1\n    }\n  }\n\n  var qop = /(^|,)\\s*auth\\s*($|,)/.test(challenge.qop) && 'auth'\n  var nc = qop && '00000001'\n  var cnonce = qop && uuid().replace(/-/g, '')\n  var ha1 = ha1Compute(challenge.algorithm, self.user, challenge.realm, self.pass, challenge.nonce, cnonce)\n  var ha2 = md5(method + ':' + path)\n  var digestResponse = qop\n    ? md5(ha1 + ':' + challenge.nonce + ':' + nc + ':' + cnonce + ':' + qop + ':' + ha2)\n    : md5(ha1 + ':' + challenge.nonce + ':' + ha2)\n  var authValues = {\n    username: self.user,\n    realm: challenge.realm,\n    nonce: challenge.nonce,\n    uri: path,\n    qop: qop,\n    response: digestResponse,\n    nc: nc,\n    cnonce: cnonce,\n    algorithm: challenge.algorithm,\n    opaque: challenge.opaque\n  }\n\n  authHeader = []\n  for (var k in authValues) {\n    if (authValues[k]) {\n      if (k === 'qop' || k === 'nc' || k === 'algorithm') {\n        authHeader.push(k + '=' + authValues[k])\n      } else {\n        authHeader.push(k + '=\"' + authValues[k] + '\"')\n      }\n    }\n  }\n  authHeader = 'Digest ' + authHeader.join(', ')\n  self.sentAuth = true\n  return authHeader\n}\n\nAuth.prototype.onRequest = function (user, pass, sendImmediately, bearer) {\n  var self = this\n  var request = self.request\n\n  var authHeader\n  if (bearer === undefined && user === undefined) {\n    self.request.emit('error', new Error('no auth mechanism defined'))\n  } else if (bearer !== undefined) {\n    authHeader = self.bearer(bearer, sendImmediately)\n  } else {\n    authHeader = self.basic(user, pass, sendImmediately)\n  }\n  if (authHeader) {\n    request.setHeader('authorization', authHeader)\n  }\n}\n\nAuth.prototype.onResponse = function (response) {\n  var self = this\n  var request = self.request\n\n  if (!self.hasAuth || self.sentAuth) { return null }\n\n  var c = caseless(response.headers)\n\n  var authHeader = c.get('www-authenticate')\n  var authVerb = authHeader && authHeader.split(' ')[0].toLowerCase()\n  request.debug('reauth', authVerb)\n\n  switch (authVerb) {\n    case 'basic':\n      return self.basic(self.user, self.pass, true)\n\n    case 'bearer':\n      return self.bearer(self.bearerToken, true)\n\n    case 'digest':\n      return self.digest(request.method, request.path, authHeader)\n  }\n}\n\nexports.Auth = Auth\n","/**\n * Copyright (c) 2014-present, Facebook, Inc.\n *\n * This source code is licensed under the MIT license found in the\n * LICENSE file in the root directory of this source tree.\n */\n\nvar runtime = (function (exports) {\n  \"use strict\";\n\n  var Op = Object.prototype;\n  var hasOwn = Op.hasOwnProperty;\n  var undefined; // More compressible than void 0.\n  var $Symbol = typeof Symbol === \"function\" ? Symbol : {};\n  var iteratorSymbol = $Symbol.iterator || \"@@iterator\";\n  var asyncIteratorSymbol = $Symbol.asyncIterator || \"@@asyncIterator\";\n  var toStringTagSymbol = $Symbol.toStringTag || \"@@toStringTag\";\n\n  function define(obj, key, value) {\n    Object.defineProperty(obj, key, {\n      value: value,\n      enumerable: true,\n      configurable: true,\n      writable: true\n    });\n    return obj[key];\n  }\n  try {\n    // IE 8 has a broken Object.defineProperty that only works on DOM objects.\n    define({}, \"\");\n  } catch (err) {\n    define = function(obj, key, value) {\n      return obj[key] = value;\n    };\n  }\n\n  function wrap(innerFn, outerFn, self, tryLocsList) {\n    // If outerFn provided and outerFn.prototype is a Generator, then outerFn.prototype instanceof Generator.\n    var protoGenerator = outerFn && outerFn.prototype instanceof Generator ? outerFn : Generator;\n    var generator = Object.create(protoGenerator.prototype);\n    var context = new Context(tryLocsList || []);\n\n    // The ._invoke method unifies the implementations of the .next,\n    // .throw, and .return methods.\n    generator._invoke = makeInvokeMethod(innerFn, self, context);\n\n    return generator;\n  }\n  exports.wrap = wrap;\n\n  // Try/catch helper to minimize deoptimizations. Returns a completion\n  // record like context.tryEntries[i].completion. This interface could\n  // have been (and was previously) designed to take a closure to be\n  // invoked without arguments, but in all the cases we care about we\n  // already have an existing method we want to call, so there's no need\n  // to create a new function object. We can even get away with assuming\n  // the method takes exactly one argument, since that happens to be true\n  // in every case, so we don't have to touch the arguments object. The\n  // only additional allocation required is the completion record, which\n  // has a stable shape and so hopefully should be cheap to allocate.\n  function tryCatch(fn, obj, arg) {\n    try {\n      return { type: \"normal\", arg: fn.call(obj, arg) };\n    } catch (err) {\n      return { type: \"throw\", arg: err };\n    }\n  }\n\n  var GenStateSuspendedStart = \"suspendedStart\";\n  var GenStateSuspendedYield = \"suspendedYield\";\n  var GenStateExecuting = \"executing\";\n  var GenStateCompleted = \"completed\";\n\n  // Returning this object from the innerFn has the same effect as\n  // breaking out of the dispatch switch statement.\n  var ContinueSentinel = {};\n\n  // Dummy constructor functions that we use as the .constructor and\n  // .constructor.prototype properties for functions that return Generator\n  // objects. For full spec compliance, you may wish to configure your\n  // minifier not to mangle the names of these two functions.\n  function Generator() {}\n  function GeneratorFunction() {}\n  function GeneratorFunctionPrototype() {}\n\n  // This is a polyfill for %IteratorPrototype% for environments that\n  // don't natively support it.\n  var IteratorPrototype = {};\n  IteratorPrototype[iteratorSymbol] = function () {\n    return this;\n  };\n\n  var getProto = Object.getPrototypeOf;\n  var NativeIteratorPrototype = getProto && getProto(getProto(values([])));\n  if (NativeIteratorPrototype &&\n      NativeIteratorPrototype !== Op &&\n      hasOwn.call(NativeIteratorPrototype, iteratorSymbol)) {\n    // This environment has a native %IteratorPrototype%; use it instead\n    // of the polyfill.\n    IteratorPrototype = NativeIteratorPrototype;\n  }\n\n  var Gp = GeneratorFunctionPrototype.prototype =\n    Generator.prototype = Object.create(IteratorPrototype);\n  GeneratorFunction.prototype = Gp.constructor = GeneratorFunctionPrototype;\n  GeneratorFunctionPrototype.constructor = GeneratorFunction;\n  GeneratorFunction.displayName = define(\n    GeneratorFunctionPrototype,\n    toStringTagSymbol,\n    \"GeneratorFunction\"\n  );\n\n  // Helper for defining the .next, .throw, and .return methods of the\n  // Iterator interface in terms of a single ._invoke method.\n  function defineIteratorMethods(prototype) {\n    [\"next\", \"throw\", \"return\"].forEach(function(method) {\n      define(prototype, method, function(arg) {\n        return this._invoke(method, arg);\n      });\n    });\n  }\n\n  exports.isGeneratorFunction = function(genFun) {\n    var ctor = typeof genFun === \"function\" && genFun.constructor;\n    return ctor\n      ? ctor === GeneratorFunction ||\n        // For the native GeneratorFunction constructor, the best we can\n        // do is to check its .name property.\n        (ctor.displayName || ctor.name) === \"GeneratorFunction\"\n      : false;\n  };\n\n  exports.mark = function(genFun) {\n    if (Object.setPrototypeOf) {\n      Object.setPrototypeOf(genFun, GeneratorFunctionPrototype);\n    } else {\n      genFun.__proto__ = GeneratorFunctionPrototype;\n      define(genFun, toStringTagSymbol, \"GeneratorFunction\");\n    }\n    genFun.prototype = Object.create(Gp);\n    return genFun;\n  };\n\n  // Within the body of any async function, `await x` is transformed to\n  // `yield regeneratorRuntime.awrap(x)`, so that the runtime can test\n  // `hasOwn.call(value, \"__await\")` to determine if the yielded value is\n  // meant to be awaited.\n  exports.awrap = function(arg) {\n    return { __await: arg };\n  };\n\n  function AsyncIterator(generator, PromiseImpl) {\n    function invoke(method, arg, resolve, reject) {\n      var record = tryCatch(generator[method], generator, arg);\n      if (record.type === \"throw\") {\n        reject(record.arg);\n      } else {\n        var result = record.arg;\n        var value = result.value;\n        if (value &&\n            typeof value === \"object\" &&\n            hasOwn.call(value, \"__await\")) {\n          return PromiseImpl.resolve(value.__await).then(function(value) {\n            invoke(\"next\", value, resolve, reject);\n          }, function(err) {\n            invoke(\"throw\", err, resolve, reject);\n          });\n        }\n\n        return PromiseImpl.resolve(value).then(function(unwrapped) {\n          // When a yielded Promise is resolved, its final value becomes\n          // the .value of the Promise<{value,done}> result for the\n          // current iteration.\n          result.value = unwrapped;\n          resolve(result);\n        }, function(error) {\n          // If a rejected Promise was yielded, throw the rejection back\n          // into the async generator function so it can be handled there.\n          return invoke(\"throw\", error, resolve, reject);\n        });\n      }\n    }\n\n    var previousPromise;\n\n    function enqueue(method, arg) {\n      function callInvokeWithMethodAndArg() {\n        return new PromiseImpl(function(resolve, reject) {\n          invoke(method, arg, resolve, reject);\n        });\n      }\n\n      return previousPromise =\n        // If enqueue has been called before, then we want to wait until\n        // all previous Promises have been resolved before calling invoke,\n        // so that results are always delivered in the correct order. If\n        // enqueue has not been called before, then it is important to\n        // call invoke immediately, without waiting on a callback to fire,\n        // so that the async generator function has the opportunity to do\n        // any necessary setup in a predictable way. This predictability\n        // is why the Promise constructor synchronously invokes its\n        // executor callback, and why async functions synchronously\n        // execute code before the first await. Since we implement simple\n        // async functions in terms of async generators, it is especially\n        // important to get this right, even though it requires care.\n        previousPromise ? previousPromise.then(\n          callInvokeWithMethodAndArg,\n          // Avoid propagating failures to Promises returned by later\n          // invocations of the iterator.\n          callInvokeWithMethodAndArg\n        ) : callInvokeWithMethodAndArg();\n    }\n\n    // Define the unified helper method that is used to implement .next,\n    // .throw, and .return (see defineIteratorMethods).\n    this._invoke = enqueue;\n  }\n\n  defineIteratorMethods(AsyncIterator.prototype);\n  AsyncIterator.prototype[asyncIteratorSymbol] = function () {\n    return this;\n  };\n  exports.AsyncIterator = AsyncIterator;\n\n  // Note that simple async functions are implemented on top of\n  // AsyncIterator objects; they just return a Promise for the value of\n  // the final result produced by the iterator.\n  exports.async = function(innerFn, outerFn, self, tryLocsList, PromiseImpl) {\n    if (PromiseImpl === void 0) PromiseImpl = Promise;\n\n    var iter = new AsyncIterator(\n      wrap(innerFn, outerFn, self, tryLocsList),\n      PromiseImpl\n    );\n\n    return exports.isGeneratorFunction(outerFn)\n      ? iter // If outerFn is a generator, return the full iterator.\n      : iter.next().then(function(result) {\n          return result.done ? result.value : iter.next();\n        });\n  };\n\n  function makeInvokeMethod(innerFn, self, context) {\n    var state = GenStateSuspendedStart;\n\n    return function invoke(method, arg) {\n      if (state === GenStateExecuting) {\n        throw new Error(\"Generator is already running\");\n      }\n\n      if (state === GenStateCompleted) {\n        if (method === \"throw\") {\n          throw arg;\n        }\n\n        // Be forgiving, per 25.3.3.3.3 of the spec:\n        // https://people.mozilla.org/~jorendorff/es6-draft.html#sec-generatorresume\n        return doneResult();\n      }\n\n      context.method = method;\n      context.arg = arg;\n\n      while (true) {\n        var delegate = context.delegate;\n        if (delegate) {\n          var delegateResult = maybeInvokeDelegate(delegate, context);\n          if (delegateResult) {\n            if (delegateResult === ContinueSentinel) continue;\n            return delegateResult;\n          }\n        }\n\n        if (context.method === \"next\") {\n          // Setting context._sent for legacy support of Babel's\n          // function.sent implementation.\n          context.sent = context._sent = context.arg;\n\n        } else if (context.method === \"throw\") {\n          if (state === GenStateSuspendedStart) {\n            state = GenStateCompleted;\n            throw context.arg;\n          }\n\n          context.dispatchException(context.arg);\n\n        } else if (context.method === \"return\") {\n          context.abrupt(\"return\", context.arg);\n        }\n\n        state = GenStateExecuting;\n\n        var record = tryCatch(innerFn, self, context);\n        if (record.type === \"normal\") {\n          // If an exception is thrown from innerFn, we leave state ===\n          // GenStateExecuting and loop back for another invocation.\n          state = context.done\n            ? GenStateCompleted\n            : GenStateSuspendedYield;\n\n          if (record.arg === ContinueSentinel) {\n            continue;\n          }\n\n          return {\n            value: record.arg,\n            done: context.done\n          };\n\n        } else if (record.type === \"throw\") {\n          state = GenStateCompleted;\n          // Dispatch the exception by looping back around to the\n          // context.dispatchException(context.arg) call above.\n          context.method = \"throw\";\n          context.arg = record.arg;\n        }\n      }\n    };\n  }\n\n  // Call delegate.iterator[context.method](context.arg) and handle the\n  // result, either by returning a { value, done } result from the\n  // delegate iterator, or by modifying context.method and context.arg,\n  // setting context.delegate to null, and returning the ContinueSentinel.\n  function maybeInvokeDelegate(delegate, context) {\n    var method = delegate.iterator[context.method];\n    if (method === undefined) {\n      // A .throw or .return when the delegate iterator has no .throw\n      // method always terminates the yield* loop.\n      context.delegate = null;\n\n      if (context.method === \"throw\") {\n        // Note: [\"return\"] must be used for ES3 parsing compatibility.\n        if (delegate.iterator[\"return\"]) {\n          // If the delegate iterator has a return method, give it a\n          // chance to clean up.\n          context.method = \"return\";\n          context.arg = undefined;\n          maybeInvokeDelegate(delegate, context);\n\n          if (context.method === \"throw\") {\n            // If maybeInvokeDelegate(context) changed context.method from\n            // \"return\" to \"throw\", let that override the TypeError below.\n            return ContinueSentinel;\n          }\n        }\n\n        context.method = \"throw\";\n        context.arg = new TypeError(\n          \"The iterator does not provide a 'throw' method\");\n      }\n\n      return ContinueSentinel;\n    }\n\n    var record = tryCatch(method, delegate.iterator, context.arg);\n\n    if (record.type === \"throw\") {\n      context.method = \"throw\";\n      context.arg = record.arg;\n      context.delegate = null;\n      return ContinueSentinel;\n    }\n\n    var info = record.arg;\n\n    if (! info) {\n      context.method = \"throw\";\n      context.arg = new TypeError(\"iterator result is not an object\");\n      context.delegate = null;\n      return ContinueSentinel;\n    }\n\n    if (info.done) {\n      // Assign the result of the finished delegate to the temporary\n      // variable specified by delegate.resultName (see delegateYield).\n      context[delegate.resultName] = info.value;\n\n      // Resume execution at the desired location (see delegateYield).\n      context.next = delegate.nextLoc;\n\n      // If context.method was \"throw\" but the delegate handled the\n      // exception, let the outer generator proceed normally. If\n      // context.method was \"next\", forget context.arg since it has been\n      // \"consumed\" by the delegate iterator. If context.method was\n      // \"return\", allow the original .return call to continue in the\n      // outer generator.\n      if (context.method !== \"return\") {\n        context.method = \"next\";\n        context.arg = undefined;\n      }\n\n    } else {\n      // Re-yield the result returned by the delegate method.\n      return info;\n    }\n\n    // The delegate iterator is finished, so forget it and continue with\n    // the outer generator.\n    context.delegate = null;\n    return ContinueSentinel;\n  }\n\n  // Define Generator.prototype.{next,throw,return} in terms of the\n  // unified ._invoke helper method.\n  defineIteratorMethods(Gp);\n\n  define(Gp, toStringTagSymbol, \"Generator\");\n\n  // A Generator should always return itself as the iterator object when the\n  // @@iterator function is called on it. Some browsers' implementations of the\n  // iterator prototype chain incorrectly implement this, causing the Generator\n  // object to not be returned from this call. This ensures that doesn't happen.\n  // See https://github.com/facebook/regenerator/issues/274 for more details.\n  Gp[iteratorSymbol] = function() {\n    return this;\n  };\n\n  Gp.toString = function() {\n    return \"[object Generator]\";\n  };\n\n  function pushTryEntry(locs) {\n    var entry = { tryLoc: locs[0] };\n\n    if (1 in locs) {\n      entry.catchLoc = locs[1];\n    }\n\n    if (2 in locs) {\n      entry.finallyLoc = locs[2];\n      entry.afterLoc = locs[3];\n    }\n\n    this.tryEntries.push(entry);\n  }\n\n  function resetTryEntry(entry) {\n    var record = entry.completion || {};\n    record.type = \"normal\";\n    delete record.arg;\n    entry.completion = record;\n  }\n\n  function Context(tryLocsList) {\n    // The root entry object (effectively a try statement without a catch\n    // or a finally block) gives us a place to store values thrown from\n    // locations where there is no enclosing try statement.\n    this.tryEntries = [{ tryLoc: \"root\" }];\n    tryLocsList.forEach(pushTryEntry, this);\n    this.reset(true);\n  }\n\n  exports.keys = function(object) {\n    var keys = [];\n    for (var key in object) {\n      keys.push(key);\n    }\n    keys.reverse();\n\n    // Rather than returning an object with a next method, we keep\n    // things simple and return the next function itself.\n    return function next() {\n      while (keys.length) {\n        var key = keys.pop();\n        if (key in object) {\n          next.value = key;\n          next.done = false;\n          return next;\n        }\n      }\n\n      // To avoid creating an additional object, we just hang the .value\n      // and .done properties off the next function object itself. This\n      // also ensures that the minifier will not anonymize the function.\n      next.done = true;\n      return next;\n    };\n  };\n\n  function values(iterable) {\n    if (iterable) {\n      var iteratorMethod = iterable[iteratorSymbol];\n      if (iteratorMethod) {\n        return iteratorMethod.call(iterable);\n      }\n\n      if (typeof iterable.next === \"function\") {\n        return iterable;\n      }\n\n      if (!isNaN(iterable.length)) {\n        var i = -1, next = function next() {\n          while (++i < iterable.length) {\n            if (hasOwn.call(iterable, i)) {\n              next.value = iterable[i];\n              next.done = false;\n              return next;\n            }\n          }\n\n          next.value = undefined;\n          next.done = true;\n\n          return next;\n        };\n\n        return next.next = next;\n      }\n    }\n\n    // Return an iterator with no values.\n    return { next: doneResult };\n  }\n  exports.values = values;\n\n  function doneResult() {\n    return { value: undefined, done: true };\n  }\n\n  Context.prototype = {\n    constructor: Context,\n\n    reset: function(skipTempReset) {\n      this.prev = 0;\n      this.next = 0;\n      // Resetting context._sent for legacy support of Babel's\n      // function.sent implementation.\n      this.sent = this._sent = undefined;\n      this.done = false;\n      this.delegate = null;\n\n      this.method = \"next\";\n      this.arg = undefined;\n\n      this.tryEntries.forEach(resetTryEntry);\n\n      if (!skipTempReset) {\n        for (var name in this) {\n          // Not sure about the optimal order of these conditions:\n          if (name.charAt(0) === \"t\" &&\n              hasOwn.call(this, name) &&\n              !isNaN(+name.slice(1))) {\n            this[name] = undefined;\n          }\n        }\n      }\n    },\n\n    stop: function() {\n      this.done = true;\n\n      var rootEntry = this.tryEntries[0];\n      var rootRecord = rootEntry.completion;\n      if (rootRecord.type === \"throw\") {\n        throw rootRecord.arg;\n      }\n\n      return this.rval;\n    },\n\n    dispatchException: function(exception) {\n      if (this.done) {\n        throw exception;\n      }\n\n      var context = this;\n      function handle(loc, caught) {\n        record.type = \"throw\";\n        record.arg = exception;\n        context.next = loc;\n\n        if (caught) {\n          // If the dispatched exception was caught by a catch block,\n          // then let that catch block handle the exception normally.\n          context.method = \"next\";\n          context.arg = undefined;\n        }\n\n        return !! caught;\n      }\n\n      for (var i = this.tryEntries.length - 1; i >= 0; --i) {\n        var entry = this.tryEntries[i];\n        var record = entry.completion;\n\n        if (entry.tryLoc === \"root\") {\n          // Exception thrown outside of any try block that could handle\n          // it, so set the completion value of the entire function to\n          // throw the exception.\n          return handle(\"end\");\n        }\n\n        if (entry.tryLoc <= this.prev) {\n          var hasCatch = hasOwn.call(entry, \"catchLoc\");\n          var hasFinally = hasOwn.call(entry, \"finallyLoc\");\n\n          if (hasCatch && hasFinally) {\n            if (this.prev < entry.catchLoc) {\n              return handle(entry.catchLoc, true);\n            } else if (this.prev < entry.finallyLoc) {\n              return handle(entry.finallyLoc);\n            }\n\n          } else if (hasCatch) {\n            if (this.prev < entry.catchLoc) {\n              return handle(entry.catchLoc, true);\n            }\n\n          } else if (hasFinally) {\n            if (this.prev < entry.finallyLoc) {\n              return handle(entry.finallyLoc);\n            }\n\n          } else {\n            throw new Error(\"try statement without catch or finally\");\n          }\n        }\n      }\n    },\n\n    abrupt: function(type, arg) {\n      for (var i = this.tryEntries.length - 1; i >= 0; --i) {\n        var entry = this.tryEntries[i];\n        if (entry.tryLoc <= this.prev &&\n            hasOwn.call(entry, \"finallyLoc\") &&\n            this.prev < entry.finallyLoc) {\n          var finallyEntry = entry;\n          break;\n        }\n      }\n\n      if (finallyEntry &&\n          (type === \"break\" ||\n           type === \"continue\") &&\n          finallyEntry.tryLoc <= arg &&\n          arg <= finallyEntry.finallyLoc) {\n        // Ignore the finally entry if control is not jumping to a\n        // location outside the try/catch block.\n        finallyEntry = null;\n      }\n\n      var record = finallyEntry ? finallyEntry.completion : {};\n      record.type = type;\n      record.arg = arg;\n\n      if (finallyEntry) {\n        this.method = \"next\";\n        this.next = finallyEntry.finallyLoc;\n        return ContinueSentinel;\n      }\n\n      return this.complete(record);\n    },\n\n    complete: function(record, afterLoc) {\n      if (record.type === \"throw\") {\n        throw record.arg;\n      }\n\n      if (record.type === \"break\" ||\n          record.type === \"continue\") {\n        this.next = record.arg;\n      } else if (record.type === \"return\") {\n        this.rval = this.arg = record.arg;\n        this.method = \"return\";\n        this.next = \"end\";\n      } else if (record.type === \"normal\" && afterLoc) {\n        this.next = afterLoc;\n      }\n\n      return ContinueSentinel;\n    },\n\n    finish: function(finallyLoc) {\n      for (var i = this.tryEntries.length - 1; i >= 0; --i) {\n        var entry = this.tryEntries[i];\n        if (entry.finallyLoc === finallyLoc) {\n          this.complete(entry.completion, entry.afterLoc);\n          resetTryEntry(entry);\n          return ContinueSentinel;\n        }\n      }\n    },\n\n    \"catch\": function(tryLoc) {\n      for (var i = this.tryEntries.length - 1; i >= 0; --i) {\n        var entry = this.tryEntries[i];\n        if (entry.tryLoc === tryLoc) {\n          var record = entry.completion;\n          if (record.type === \"throw\") {\n            var thrown = record.arg;\n            resetTryEntry(entry);\n          }\n          return thrown;\n        }\n      }\n\n      // The context.catch method must only be called with a location\n      // argument that corresponds to a known catch block.\n      throw new Error(\"illegal catch attempt\");\n    },\n\n    delegateYield: function(iterable, resultName, nextLoc) {\n      this.delegate = {\n        iterator: values(iterable),\n        resultName: resultName,\n        nextLoc: nextLoc\n      };\n\n      if (this.method === \"next\") {\n        // Deliberately forget the last sent value so that we don't\n        // accidentally pass it on to the delegate.\n        this.arg = undefined;\n      }\n\n      return ContinueSentinel;\n    }\n  };\n\n  // Regardless of whether this script is executing as a CommonJS module\n  // or not, return the runtime object so that we can declare the variable\n  // regeneratorRuntime in the outer scope, which allows this module to be\n  // injected easily by `bin/regenerator --include-runtime script.js`.\n  return exports;\n\n}(\n  // If this script is executing as a CommonJS module, use module.exports\n  // as the regeneratorRuntime namespace. Otherwise create a new empty\n  // object. Either way, the resulting object will be used to initialize\n  // the regeneratorRuntime variable at the top of this file.\n  typeof module === \"object\" ? module.exports : {}\n));\n\ntry {\n  regeneratorRuntime = runtime;\n} catch (accidentalStrictMode) {\n  // This module should not be running in strict mode, so the above\n  // assignment should always work unless something is misconfigured. Just\n  // in case runtime.js accidentally runs in strict mode, we can escape\n  // strict mode using a global Function call. This could conceivably fail\n  // if a Content Security Policy forbids using Function, but in that case\n  // the proper solution is to fix the accidental strict mode problem. If\n  // you've misconfigured your bundler to force strict mode and applied a\n  // CSP to forbid Function, and you're not willing to fix either of those\n  // problems, please detail your unique predicament in a GitHub issue.\n  Function(\"r\", \"regeneratorRuntime = r\")(runtime);\n}\n","'use strict'\n\nvar url = require('url')\nvar isUrl = /^https?:/\n\nfunction Redirect (request) {\n  this.request = request\n  this.followRedirect = true\n  this.followRedirects = true\n  this.followAllRedirects = false\n  this.followOriginalHttpMethod = false\n  this.allowRedirect = function () { return true }\n  this.maxRedirects = 10\n  this.redirects = []\n  this.redirectsFollowed = 0\n  this.removeRefererHeader = false\n}\n\nRedirect.prototype.onRequest = function (options) {\n  var self = this\n\n  if (options.maxRedirects !== undefined) {\n    self.maxRedirects = options.maxRedirects\n  }\n  if (typeof options.followRedirect === 'function') {\n    self.allowRedirect = options.followRedirect\n  }\n  if (options.followRedirect !== undefined) {\n    self.followRedirects = !!options.followRedirect\n  }\n  if (options.followAllRedirects !== undefined) {\n    self.followAllRedirects = options.followAllRedirects\n  }\n  if (self.followRedirects || self.followAllRedirects) {\n    self.redirects = self.redirects || []\n  }\n  if (options.removeRefererHeader !== undefined) {\n    self.removeRefererHeader = options.removeRefererHeader\n  }\n  if (options.followOriginalHttpMethod !== undefined) {\n    self.followOriginalHttpMethod = options.followOriginalHttpMethod\n  }\n}\n\nRedirect.prototype.redirectTo = function (response) {\n  var self = this\n  var request = self.request\n\n  var redirectTo = null\n  if (response.statusCode >= 300 && response.statusCode < 400 && response.caseless.has('location')) {\n    var location = response.caseless.get('location')\n    request.debug('redirect', location)\n\n    if (self.followAllRedirects) {\n      redirectTo = location\n    } else if (self.followRedirects) {\n      switch (request.method) {\n        case 'PATCH':\n        case 'PUT':\n        case 'POST':\n        case 'DELETE':\n          // Do not follow redirects\n          break\n        default:\n          redirectTo = location\n          break\n      }\n    }\n  } else if (response.statusCode === 401) {\n    var authHeader = request._auth.onResponse(response)\n    if (authHeader) {\n      request.setHeader('authorization', authHeader)\n      redirectTo = request.uri\n    }\n  }\n  return redirectTo\n}\n\nRedirect.prototype.onResponse = function (response) {\n  var self = this\n  var request = self.request\n\n  var redirectTo = self.redirectTo(response)\n  if (!redirectTo || !self.allowRedirect.call(request, response)) {\n    return false\n  }\n\n  request.debug('redirect to', redirectTo)\n\n  // ignore any potential response body.  it cannot possibly be useful\n  // to us at this point.\n  // response.resume should be defined, but check anyway before calling. Workaround for browserify.\n  if (response.resume) {\n    response.resume()\n  }\n\n  if (self.redirectsFollowed >= self.maxRedirects) {\n    request.emit('error', new Error('Exceeded maxRedirects. Probably stuck in a redirect loop ' + request.uri.href))\n    return false\n  }\n  self.redirectsFollowed += 1\n\n  if (!isUrl.test(redirectTo)) {\n    redirectTo = url.resolve(request.uri.href, redirectTo)\n  }\n\n  var uriPrev = request.uri\n  request.uri = url.parse(redirectTo)\n\n  // handle the case where we change protocol from https to http or vice versa\n  if (request.uri.protocol !== uriPrev.protocol) {\n    delete request.agent\n  }\n\n  self.redirects.push({ statusCode: response.statusCode, redirectUri: redirectTo })\n\n  if (self.followAllRedirects && request.method !== 'HEAD' &&\n    response.statusCode !== 401 && response.statusCode !== 307) {\n    request.method = self.followOriginalHttpMethod ? request.method : 'GET'\n  }\n  // request.method = 'GET' // Force all redirects to use GET || commented out fixes #215\n  delete request.src\n  delete request.req\n  delete request._started\n  if (response.statusCode !== 401 && response.statusCode !== 307) {\n    // Remove parameters from the previous response, unless this is the second request\n    // for a server that requires digest authentication.\n    delete request.body\n    delete request._form\n    if (request.headers) {\n      request.removeHeader('host')\n      request.removeHeader('content-type')\n      request.removeHeader('content-length')\n      if (request.uri.hostname !== request.originalHost.split(':')[0]) {\n        // Remove authorization if changing hostnames (but not if just\n        // changing ports or protocols).  This matches the behavior of curl:\n        // https://github.com/bagder/curl/blob/6beb0eee/lib/http.c#L710\n        request.removeHeader('authorization')\n      }\n    }\n  }\n\n  if (!self.removeRefererHeader) {\n    request.setHeader('referer', uriPrev.href)\n  }\n\n  request.emit('redirect')\n\n  request.init()\n\n  return true\n}\n\nexports.Redirect = Redirect\n","'use strict'\n\nvar url = require('url')\nvar tunnel = require('tunnel-agent')\n\nvar defaultProxyHeaderWhiteList = [\n  'accept',\n  'accept-charset',\n  'accept-encoding',\n  'accept-language',\n  'accept-ranges',\n  'cache-control',\n  'content-encoding',\n  'content-language',\n  'content-location',\n  'content-md5',\n  'content-range',\n  'content-type',\n  'connection',\n  'date',\n  'expect',\n  'max-forwards',\n  'pragma',\n  'referer',\n  'te',\n  'user-agent',\n  'via'\n]\n\nvar defaultProxyHeaderExclusiveList = [\n  'proxy-authorization'\n]\n\nfunction constructProxyHost (uriObject) {\n  var port = uriObject.port\n  var protocol = uriObject.protocol\n  var proxyHost = uriObject.hostname + ':'\n\n  if (port) {\n    proxyHost += port\n  } else if (protocol === 'https:') {\n    proxyHost += '443'\n  } else {\n    proxyHost += '80'\n  }\n\n  return proxyHost\n}\n\nfunction constructProxyHeaderWhiteList (headers, proxyHeaderWhiteList) {\n  var whiteList = proxyHeaderWhiteList\n    .reduce(function (set, header) {\n      set[header.toLowerCase()] = true\n      return set\n    }, {})\n\n  return Object.keys(headers)\n    .filter(function (header) {\n      return whiteList[header.toLowerCase()]\n    })\n    .reduce(function (set, header) {\n      set[header] = headers[header]\n      return set\n    }, {})\n}\n\nfunction constructTunnelOptions (request, proxyHeaders) {\n  var proxy = request.proxy\n\n  var tunnelOptions = {\n    proxy: {\n      host: proxy.hostname,\n      port: +proxy.port,\n      proxyAuth: proxy.auth,\n      headers: proxyHeaders\n    },\n    headers: request.headers,\n    ca: request.ca,\n    cert: request.cert,\n    key: request.key,\n    passphrase: request.passphrase,\n    pfx: request.pfx,\n    ciphers: request.ciphers,\n    rejectUnauthorized: request.rejectUnauthorized,\n    secureOptions: request.secureOptions,\n    secureProtocol: request.secureProtocol\n  }\n\n  return tunnelOptions\n}\n\nfunction constructTunnelFnName (uri, proxy) {\n  var uriProtocol = (uri.protocol === 'https:' ? 'https' : 'http')\n  var proxyProtocol = (proxy.protocol === 'https:' ? 'Https' : 'Http')\n  return [uriProtocol, proxyProtocol].join('Over')\n}\n\nfunction getTunnelFn (request) {\n  var uri = request.uri\n  var proxy = request.proxy\n  var tunnelFnName = constructTunnelFnName(uri, proxy)\n  return tunnel[tunnelFnName]\n}\n\nfunction Tunnel (request) {\n  this.request = request\n  this.proxyHeaderWhiteList = defaultProxyHeaderWhiteList\n  this.proxyHeaderExclusiveList = []\n  if (typeof request.tunnel !== 'undefined') {\n    this.tunnelOverride = request.tunnel\n  }\n}\n\nTunnel.prototype.isEnabled = function () {\n  var self = this\n  var request = self.request\n    // Tunnel HTTPS by default. Allow the user to override this setting.\n\n  // If self.tunnelOverride is set (the user specified a value), use it.\n  if (typeof self.tunnelOverride !== 'undefined') {\n    return self.tunnelOverride\n  }\n\n  // If the destination is HTTPS, tunnel.\n  if (request.uri.protocol === 'https:') {\n    return true\n  }\n\n  // Otherwise, do not use tunnel.\n  return false\n}\n\nTunnel.prototype.setup = function (options) {\n  var self = this\n  var request = self.request\n\n  options = options || {}\n\n  if (typeof request.proxy === 'string') {\n    request.proxy = url.parse(request.proxy)\n  }\n\n  if (!request.proxy || !request.tunnel) {\n    return false\n  }\n\n  // Setup Proxy Header Exclusive List and White List\n  if (options.proxyHeaderWhiteList) {\n    self.proxyHeaderWhiteList = options.proxyHeaderWhiteList\n  }\n  if (options.proxyHeaderExclusiveList) {\n    self.proxyHeaderExclusiveList = options.proxyHeaderExclusiveList\n  }\n\n  var proxyHeaderExclusiveList = self.proxyHeaderExclusiveList.concat(defaultProxyHeaderExclusiveList)\n  var proxyHeaderWhiteList = self.proxyHeaderWhiteList.concat(proxyHeaderExclusiveList)\n\n  // Setup Proxy Headers and Proxy Headers Host\n  // Only send the Proxy White Listed Header names\n  var proxyHeaders = constructProxyHeaderWhiteList(request.headers, proxyHeaderWhiteList)\n  proxyHeaders.host = constructProxyHost(request.uri)\n\n  proxyHeaderExclusiveList.forEach(request.removeHeader, request)\n\n  // Set Agent from Tunnel Data\n  var tunnelFn = getTunnelFn(request)\n  var tunnelOptions = constructTunnelOptions(request, proxyHeaders)\n  request.agent = tunnelFn(tunnelOptions)\n\n  return true\n}\n\nTunnel.defaultProxyHeaderWhiteList = defaultProxyHeaderWhiteList\nTunnel.defaultProxyHeaderExclusiveList = defaultProxyHeaderExclusiveList\nexports.Tunnel = Tunnel\n","// Copyright Joyent, Inc. and other Node contributors.\n//\n// Permission is hereby granted, free of charge, to any person obtaining a\n// copy of this software and associated documentation files (the\n// \"Software\"), to deal in the Software without restriction, including\n// without limitation the rights to use, copy, modify, merge, publish,\n// distribute, sublicense, and/or sell copies of the Software, and to permit\n// persons to whom the Software is furnished to do so, subject to the\n// following conditions:\n//\n// The above copyright notice and this permission notice shall be included\n// in all copies or substantial portions of the Software.\n//\n// THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS\n// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF\n// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN\n// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,\n// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR\n// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE\n// USE OR OTHER DEALINGS IN THE SOFTWARE.\n\n'use strict';\n\n/*<replacement>*/\n\nvar pna = require('process-nextick-args');\n/*</replacement>*/\n\nmodule.exports = Readable;\n\n/*<replacement>*/\nvar isArray = require('isarray');\n/*</replacement>*/\n\n/*<replacement>*/\nvar Duplex;\n/*</replacement>*/\n\nReadable.ReadableState = ReadableState;\n\n/*<replacement>*/\nvar EE = require('events').EventEmitter;\n\nvar EElistenerCount = function (emitter, type) {\n  return emitter.listeners(type).length;\n};\n/*</replacement>*/\n\n/*<replacement>*/\nvar Stream = require('./internal/streams/stream');\n/*</replacement>*/\n\n/*<replacement>*/\n\nvar Buffer = require('safe-buffer').Buffer;\nvar OurUint8Array = global.Uint8Array || function () {};\nfunction _uint8ArrayToBuffer(chunk) {\n  return Buffer.from(chunk);\n}\nfunction _isUint8Array(obj) {\n  return Buffer.isBuffer(obj) || obj instanceof OurUint8Array;\n}\n\n/*</replacement>*/\n\n/*<replacement>*/\nvar util = Object.create(require('core-util-is'));\nutil.inherits = require('inherits');\n/*</replacement>*/\n\n/*<replacement>*/\nvar debugUtil = require('util');\nvar debug = void 0;\nif (debugUtil && debugUtil.debuglog) {\n  debug = debugUtil.debuglog('stream');\n} else {\n  debug = function () {};\n}\n/*</replacement>*/\n\nvar BufferList = require('./internal/streams/BufferList');\nvar destroyImpl = require('./internal/streams/destroy');\nvar StringDecoder;\n\nutil.inherits(Readable, Stream);\n\nvar kProxyEvents = ['error', 'close', 'destroy', 'pause', 'resume'];\n\nfunction prependListener(emitter, event, fn) {\n  // Sadly this is not cacheable as some libraries bundle their own\n  // event emitter implementation with them.\n  if (typeof emitter.prependListener === 'function') return emitter.prependListener(event, fn);\n\n  // This is a hack to make sure that our error handler is attached before any\n  // userland ones.  NEVER DO THIS. This is here only because this code needs\n  // to continue to work with older versions of Node.js that do not include\n  // the prependListener() method. The goal is to eventually remove this hack.\n  if (!emitter._events || !emitter._events[event]) emitter.on(event, fn);else if (isArray(emitter._events[event])) emitter._events[event].unshift(fn);else emitter._events[event] = [fn, emitter._events[event]];\n}\n\nfunction ReadableState(options, stream) {\n  Duplex = Duplex || require('./_stream_duplex');\n\n  options = options || {};\n\n  // Duplex streams are both readable and writable, but share\n  // the same options object.\n  // However, some cases require setting options to different\n  // values for the readable and the writable sides of the duplex stream.\n  // These options can be provided separately as readableXXX and writableXXX.\n  var isDuplex = stream instanceof Duplex;\n\n  // object stream flag. Used to make read(n) ignore n and to\n  // make all the buffer merging and length checks go away\n  this.objectMode = !!options.objectMode;\n\n  if (isDuplex) this.objectMode = this.objectMode || !!options.readableObjectMode;\n\n  // the point at which it stops calling _read() to fill the buffer\n  // Note: 0 is a valid value, means \"don't call _read preemptively ever\"\n  var hwm = options.highWaterMark;\n  var readableHwm = options.readableHighWaterMark;\n  var defaultHwm = this.objectMode ? 16 : 16 * 1024;\n\n  if (hwm || hwm === 0) this.highWaterMark = hwm;else if (isDuplex && (readableHwm || readableHwm === 0)) this.highWaterMark = readableHwm;else this.highWaterMark = defaultHwm;\n\n  // cast to ints.\n  this.highWaterMark = Math.floor(this.highWaterMark);\n\n  // A linked list is used to store data chunks instead of an array because the\n  // linked list can remove elements from the beginning faster than\n  // array.shift()\n  this.buffer = new BufferList();\n  this.length = 0;\n  this.pipes = null;\n  this.pipesCount = 0;\n  this.flowing = null;\n  this.ended = false;\n  this.endEmitted = false;\n  this.reading = false;\n\n  // a flag to be able to tell if the event 'readable'/'data' is emitted\n  // immediately, or on a later tick.  We set this to true at first, because\n  // any actions that shouldn't happen until \"later\" should generally also\n  // not happen before the first read call.\n  this.sync = true;\n\n  // whenever we return null, then we set a flag to say\n  // that we're awaiting a 'readable' event emission.\n  this.needReadable = false;\n  this.emittedReadable = false;\n  this.readableListening = false;\n  this.resumeScheduled = false;\n\n  // has it been destroyed\n  this.destroyed = false;\n\n  // Crypto is kind of old and crusty.  Historically, its default string\n  // encoding is 'binary' so we have to make this configurable.\n  // Everything else in the universe uses 'utf8', though.\n  this.defaultEncoding = options.defaultEncoding || 'utf8';\n\n  // the number of writers that are awaiting a drain event in .pipe()s\n  this.awaitDrain = 0;\n\n  // if true, a maybeReadMore has been scheduled\n  this.readingMore = false;\n\n  this.decoder = null;\n  this.encoding = null;\n  if (options.encoding) {\n    if (!StringDecoder) StringDecoder = require('string_decoder/').StringDecoder;\n    this.decoder = new StringDecoder(options.encoding);\n    this.encoding = options.encoding;\n  }\n}\n\nfunction Readable(options) {\n  Duplex = Duplex || require('./_stream_duplex');\n\n  if (!(this instanceof Readable)) return new Readable(options);\n\n  this._readableState = new ReadableState(options, this);\n\n  // legacy\n  this.readable = true;\n\n  if (options) {\n    if (typeof options.read === 'function') this._read = options.read;\n\n    if (typeof options.destroy === 'function') this._destroy = options.destroy;\n  }\n\n  Stream.call(this);\n}\n\nObject.defineProperty(Readable.prototype, 'destroyed', {\n  get: function () {\n    if (this._readableState === undefined) {\n      return false;\n    }\n    return this._readableState.destroyed;\n  },\n  set: function (value) {\n    // we ignore the value if the stream\n    // has not been initialized yet\n    if (!this._readableState) {\n      return;\n    }\n\n    // backward compatibility, the user is explicitly\n    // managing destroyed\n    this._readableState.destroyed = value;\n  }\n});\n\nReadable.prototype.destroy = destroyImpl.destroy;\nReadable.prototype._undestroy = destroyImpl.undestroy;\nReadable.prototype._destroy = function (err, cb) {\n  this.push(null);\n  cb(err);\n};\n\n// Manually shove something into the read() buffer.\n// This returns true if the highWaterMark has not been hit yet,\n// similar to how Writable.write() returns true if you should\n// write() some more.\nReadable.prototype.push = function (chunk, encoding) {\n  var state = this._readableState;\n  var skipChunkCheck;\n\n  if (!state.objectMode) {\n    if (typeof chunk === 'string') {\n      encoding = encoding || state.defaultEncoding;\n      if (encoding !== state.encoding) {\n        chunk = Buffer.from(chunk, encoding);\n        encoding = '';\n      }\n      skipChunkCheck = true;\n    }\n  } else {\n    skipChunkCheck = true;\n  }\n\n  return readableAddChunk(this, chunk, encoding, false, skipChunkCheck);\n};\n\n// Unshift should *always* be something directly out of read()\nReadable.prototype.unshift = function (chunk) {\n  return readableAddChunk(this, chunk, null, true, false);\n};\n\nfunction readableAddChunk(stream, chunk, encoding, addToFront, skipChunkCheck) {\n  var state = stream._readableState;\n  if (chunk === null) {\n    state.reading = false;\n    onEofChunk(stream, state);\n  } else {\n    var er;\n    if (!skipChunkCheck) er = chunkInvalid(state, chunk);\n    if (er) {\n      stream.emit('error', er);\n    } else if (state.objectMode || chunk && chunk.length > 0) {\n      if (typeof chunk !== 'string' && !state.objectMode && Object.getPrototypeOf(chunk) !== Buffer.prototype) {\n        chunk = _uint8ArrayToBuffer(chunk);\n      }\n\n      if (addToFront) {\n        if (state.endEmitted) stream.emit('error', new Error('stream.unshift() after end event'));else addChunk(stream, state, chunk, true);\n      } else if (state.ended) {\n        stream.emit('error', new Error('stream.push() after EOF'));\n      } else {\n        state.reading = false;\n        if (state.decoder && !encoding) {\n          chunk = state.decoder.write(chunk);\n          if (state.objectMode || chunk.length !== 0) addChunk(stream, state, chunk, false);else maybeReadMore(stream, state);\n        } else {\n          addChunk(stream, state, chunk, false);\n        }\n      }\n    } else if (!addToFront) {\n      state.reading = false;\n    }\n  }\n\n  return needMoreData(state);\n}\n\nfunction addChunk(stream, state, chunk, addToFront) {\n  if (state.flowing && state.length === 0 && !state.sync) {\n    stream.emit('data', chunk);\n    stream.read(0);\n  } else {\n    // update the buffer info.\n    state.length += state.objectMode ? 1 : chunk.length;\n    if (addToFront) state.buffer.unshift(chunk);else state.buffer.push(chunk);\n\n    if (state.needReadable) emitReadable(stream);\n  }\n  maybeReadMore(stream, state);\n}\n\nfunction chunkInvalid(state, chunk) {\n  var er;\n  if (!_isUint8Array(chunk) && typeof chunk !== 'string' && chunk !== undefined && !state.objectMode) {\n    er = new TypeError('Invalid non-string/buffer chunk');\n  }\n  return er;\n}\n\n// if it's past the high water mark, we can push in some more.\n// Also, if we have no data yet, we can stand some\n// more bytes.  This is to work around cases where hwm=0,\n// such as the repl.  Also, if the push() triggered a\n// readable event, and the user called read(largeNumber) such that\n// needReadable was set, then we ought to push more, so that another\n// 'readable' event will be triggered.\nfunction needMoreData(state) {\n  return !state.ended && (state.needReadable || state.length < state.highWaterMark || state.length === 0);\n}\n\nReadable.prototype.isPaused = function () {\n  return this._readableState.flowing === false;\n};\n\n// backwards compatibility.\nReadable.prototype.setEncoding = function (enc) {\n  if (!StringDecoder) StringDecoder = require('string_decoder/').StringDecoder;\n  this._readableState.decoder = new StringDecoder(enc);\n  this._readableState.encoding = enc;\n  return this;\n};\n\n// Don't raise the hwm > 8MB\nvar MAX_HWM = 0x800000;\nfunction computeNewHighWaterMark(n) {\n  if (n >= MAX_HWM) {\n    n = MAX_HWM;\n  } else {\n    // Get the next highest power of 2 to prevent increasing hwm excessively in\n    // tiny amounts\n    n--;\n    n |= n >>> 1;\n    n |= n >>> 2;\n    n |= n >>> 4;\n    n |= n >>> 8;\n    n |= n >>> 16;\n    n++;\n  }\n  return n;\n}\n\n// This function is designed to be inlinable, so please take care when making\n// changes to the function body.\nfunction howMuchToRead(n, state) {\n  if (n <= 0 || state.length === 0 && state.ended) return 0;\n  if (state.objectMode) return 1;\n  if (n !== n) {\n    // Only flow one buffer at a time\n    if (state.flowing && state.length) return state.buffer.head.data.length;else return state.length;\n  }\n  // If we're asking for more than the current hwm, then raise the hwm.\n  if (n > state.highWaterMark) state.highWaterMark = computeNewHighWaterMark(n);\n  if (n <= state.length) return n;\n  // Don't have enough\n  if (!state.ended) {\n    state.needReadable = true;\n    return 0;\n  }\n  return state.length;\n}\n\n// you can override either this method, or the async _read(n) below.\nReadable.prototype.read = function (n) {\n  debug('read', n);\n  n = parseInt(n, 10);\n  var state = this._readableState;\n  var nOrig = n;\n\n  if (n !== 0) state.emittedReadable = false;\n\n  // if we're doing read(0) to trigger a readable event, but we\n  // already have a bunch of data in the buffer, then just trigger\n  // the 'readable' event and move on.\n  if (n === 0 && state.needReadable && (state.length >= state.highWaterMark || state.ended)) {\n    debug('read: emitReadable', state.length, state.ended);\n    if (state.length === 0 && state.ended) endReadable(this);else emitReadable(this);\n    return null;\n  }\n\n  n = howMuchToRead(n, state);\n\n  // if we've ended, and we're now clear, then finish it up.\n  if (n === 0 && state.ended) {\n    if (state.length === 0) endReadable(this);\n    return null;\n  }\n\n  // All the actual chunk generation logic needs to be\n  // *below* the call to _read.  The reason is that in certain\n  // synthetic stream cases, such as passthrough streams, _read\n  // may be a completely synchronous operation which may change\n  // the state of the read buffer, providing enough data when\n  // before there was *not* enough.\n  //\n  // So, the steps are:\n  // 1. Figure out what the state of things will be after we do\n  // a read from the buffer.\n  //\n  // 2. If that resulting state will trigger a _read, then call _read.\n  // Note that this may be asynchronous, or synchronous.  Yes, it is\n  // deeply ugly to write APIs this way, but that still doesn't mean\n  // that the Readable class should behave improperly, as streams are\n  // designed to be sync/async agnostic.\n  // Take note if the _read call is sync or async (ie, if the read call\n  // has returned yet), so that we know whether or not it's safe to emit\n  // 'readable' etc.\n  //\n  // 3. Actually pull the requested chunks out of the buffer and return.\n\n  // if we need a readable event, then we need to do some reading.\n  var doRead = state.needReadable;\n  debug('need readable', doRead);\n\n  // if we currently have less than the highWaterMark, then also read some\n  if (state.length === 0 || state.length - n < state.highWaterMark) {\n    doRead = true;\n    debug('length less than watermark', doRead);\n  }\n\n  // however, if we've ended, then there's no point, and if we're already\n  // reading, then it's unnecessary.\n  if (state.ended || state.reading) {\n    doRead = false;\n    debug('reading or ended', doRead);\n  } else if (doRead) {\n    debug('do read');\n    state.reading = true;\n    state.sync = true;\n    // if the length is currently zero, then we *need* a readable event.\n    if (state.length === 0) state.needReadable = true;\n    // call internal read method\n    this._read(state.highWaterMark);\n    state.sync = false;\n    // If _read pushed data synchronously, then `reading` will be false,\n    // and we need to re-evaluate how much data we can return to the user.\n    if (!state.reading) n = howMuchToRead(nOrig, state);\n  }\n\n  var ret;\n  if (n > 0) ret = fromList(n, state);else ret = null;\n\n  if (ret === null) {\n    state.needReadable = true;\n    n = 0;\n  } else {\n    state.length -= n;\n  }\n\n  if (state.length === 0) {\n    // If we have nothing in the buffer, then we want to know\n    // as soon as we *do* get something into the buffer.\n    if (!state.ended) state.needReadable = true;\n\n    // If we tried to read() past the EOF, then emit end on the next tick.\n    if (nOrig !== n && state.ended) endReadable(this);\n  }\n\n  if (ret !== null) this.emit('data', ret);\n\n  return ret;\n};\n\nfunction onEofChunk(stream, state) {\n  if (state.ended) return;\n  if (state.decoder) {\n    var chunk = state.decoder.end();\n    if (chunk && chunk.length) {\n      state.buffer.push(chunk);\n      state.length += state.objectMode ? 1 : chunk.length;\n    }\n  }\n  state.ended = true;\n\n  // emit 'readable' now to make sure it gets picked up.\n  emitReadable(stream);\n}\n\n// Don't emit readable right away in sync mode, because this can trigger\n// another read() call => stack overflow.  This way, it might trigger\n// a nextTick recursion warning, but that's not so bad.\nfunction emitReadable(stream) {\n  var state = stream._readableState;\n  state.needReadable = false;\n  if (!state.emittedReadable) {\n    debug('emitReadable', state.flowing);\n    state.emittedReadable = true;\n    if (state.sync) pna.nextTick(emitReadable_, stream);else emitReadable_(stream);\n  }\n}\n\nfunction emitReadable_(stream) {\n  debug('emit readable');\n  stream.emit('readable');\n  flow(stream);\n}\n\n// at this point, the user has presumably seen the 'readable' event,\n// and called read() to consume some data.  that may have triggered\n// in turn another _read(n) call, in which case reading = true if\n// it's in progress.\n// However, if we're not ended, or reading, and the length < hwm,\n// then go ahead and try to read some more preemptively.\nfunction maybeReadMore(stream, state) {\n  if (!state.readingMore) {\n    state.readingMore = true;\n    pna.nextTick(maybeReadMore_, stream, state);\n  }\n}\n\nfunction maybeReadMore_(stream, state) {\n  var len = state.length;\n  while (!state.reading && !state.flowing && !state.ended && state.length < state.highWaterMark) {\n    debug('maybeReadMore read 0');\n    stream.read(0);\n    if (len === state.length)\n      // didn't get any data, stop spinning.\n      break;else len = state.length;\n  }\n  state.readingMore = false;\n}\n\n// abstract method.  to be overridden in specific implementation classes.\n// call cb(er, data) where data is <= n in length.\n// for virtual (non-string, non-buffer) streams, \"length\" is somewhat\n// arbitrary, and perhaps not very meaningful.\nReadable.prototype._read = function (n) {\n  this.emit('error', new Error('_read() is not implemented'));\n};\n\nReadable.prototype.pipe = function (dest, pipeOpts) {\n  var src = this;\n  var state = this._readableState;\n\n  switch (state.pipesCount) {\n    case 0:\n      state.pipes = dest;\n      break;\n    case 1:\n      state.pipes = [state.pipes, dest];\n      break;\n    default:\n      state.pipes.push(dest);\n      break;\n  }\n  state.pipesCount += 1;\n  debug('pipe count=%d opts=%j', state.pipesCount, pipeOpts);\n\n  var doEnd = (!pipeOpts || pipeOpts.end !== false) && dest !== process.stdout && dest !== process.stderr;\n\n  var endFn = doEnd ? onend : unpipe;\n  if (state.endEmitted) pna.nextTick(endFn);else src.once('end', endFn);\n\n  dest.on('unpipe', onunpipe);\n  function onunpipe(readable, unpipeInfo) {\n    debug('onunpipe');\n    if (readable === src) {\n      if (unpipeInfo && unpipeInfo.hasUnpiped === false) {\n        unpipeInfo.hasUnpiped = true;\n        cleanup();\n      }\n    }\n  }\n\n  function onend() {\n    debug('onend');\n    dest.end();\n  }\n\n  // when the dest drains, it reduces the awaitDrain counter\n  // on the source.  This would be more elegant with a .once()\n  // handler in flow(), but adding and removing repeatedly is\n  // too slow.\n  var ondrain = pipeOnDrain(src);\n  dest.on('drain', ondrain);\n\n  var cleanedUp = false;\n  function cleanup() {\n    debug('cleanup');\n    // cleanup event handlers once the pipe is broken\n    dest.removeListener('close', onclose);\n    dest.removeListener('finish', onfinish);\n    dest.removeListener('drain', ondrain);\n    dest.removeListener('error', onerror);\n    dest.removeListener('unpipe', onunpipe);\n    src.removeListener('end', onend);\n    src.removeListener('end', unpipe);\n    src.removeListener('data', ondata);\n\n    cleanedUp = true;\n\n    // if the reader is waiting for a drain event from this\n    // specific writer, then it would cause it to never start\n    // flowing again.\n    // So, if this is awaiting a drain, then we just call it now.\n    // If we don't know, then assume that we are waiting for one.\n    if (state.awaitDrain && (!dest._writableState || dest._writableState.needDrain)) ondrain();\n  }\n\n  // If the user pushes more data while we're writing to dest then we'll end up\n  // in ondata again. However, we only want to increase awaitDrain once because\n  // dest will only emit one 'drain' event for the multiple writes.\n  // => Introduce a guard on increasing awaitDrain.\n  var increasedAwaitDrain = false;\n  src.on('data', ondata);\n  function ondata(chunk) {\n    debug('ondata');\n    increasedAwaitDrain = false;\n    var ret = dest.write(chunk);\n    if (false === ret && !increasedAwaitDrain) {\n      // If the user unpiped during `dest.write()`, it is possible\n      // to get stuck in a permanently paused state if that write\n      // also returned false.\n      // => Check whether `dest` is still a piping destination.\n      if ((state.pipesCount === 1 && state.pipes === dest || state.pipesCount > 1 && indexOf(state.pipes, dest) !== -1) && !cleanedUp) {\n        debug('false write response, pause', src._readableState.awaitDrain);\n        src._readableState.awaitDrain++;\n        increasedAwaitDrain = true;\n      }\n      src.pause();\n    }\n  }\n\n  // if the dest has an error, then stop piping into it.\n  // however, don't suppress the throwing behavior for this.\n  function onerror(er) {\n    debug('onerror', er);\n    unpipe();\n    dest.removeListener('error', onerror);\n    if (EElistenerCount(dest, 'error') === 0) dest.emit('error', er);\n  }\n\n  // Make sure our error handler is attached before userland ones.\n  prependListener(dest, 'error', onerror);\n\n  // Both close and finish should trigger unpipe, but only once.\n  function onclose() {\n    dest.removeListener('finish', onfinish);\n    unpipe();\n  }\n  dest.once('close', onclose);\n  function onfinish() {\n    debug('onfinish');\n    dest.removeListener('close', onclose);\n    unpipe();\n  }\n  dest.once('finish', onfinish);\n\n  function unpipe() {\n    debug('unpipe');\n    src.unpipe(dest);\n  }\n\n  // tell the dest that it's being piped to\n  dest.emit('pipe', src);\n\n  // start the flow if it hasn't been started already.\n  if (!state.flowing) {\n    debug('pipe resume');\n    src.resume();\n  }\n\n  return dest;\n};\n\nfunction pipeOnDrain(src) {\n  return function () {\n    var state = src._readableState;\n    debug('pipeOnDrain', state.awaitDrain);\n    if (state.awaitDrain) state.awaitDrain--;\n    if (state.awaitDrain === 0 && EElistenerCount(src, 'data')) {\n      state.flowing = true;\n      flow(src);\n    }\n  };\n}\n\nReadable.prototype.unpipe = function (dest) {\n  var state = this._readableState;\n  var unpipeInfo = { hasUnpiped: false };\n\n  // if we're not piping anywhere, then do nothing.\n  if (state.pipesCount === 0) return this;\n\n  // just one destination.  most common case.\n  if (state.pipesCount === 1) {\n    // passed in one, but it's not the right one.\n    if (dest && dest !== state.pipes) return this;\n\n    if (!dest) dest = state.pipes;\n\n    // got a match.\n    state.pipes = null;\n    state.pipesCount = 0;\n    state.flowing = false;\n    if (dest) dest.emit('unpipe', this, unpipeInfo);\n    return this;\n  }\n\n  // slow case. multiple pipe destinations.\n\n  if (!dest) {\n    // remove all.\n    var dests = state.pipes;\n    var len = state.pipesCount;\n    state.pipes = null;\n    state.pipesCount = 0;\n    state.flowing = false;\n\n    for (var i = 0; i < len; i++) {\n      dests[i].emit('unpipe', this, unpipeInfo);\n    }return this;\n  }\n\n  // try to find the right one.\n  var index = indexOf(state.pipes, dest);\n  if (index === -1) return this;\n\n  state.pipes.splice(index, 1);\n  state.pipesCount -= 1;\n  if (state.pipesCount === 1) state.pipes = state.pipes[0];\n\n  dest.emit('unpipe', this, unpipeInfo);\n\n  return this;\n};\n\n// set up data events if they are asked for\n// Ensure readable listeners eventually get something\nReadable.prototype.on = function (ev, fn) {\n  var res = Stream.prototype.on.call(this, ev, fn);\n\n  if (ev === 'data') {\n    // Start flowing on next tick if stream isn't explicitly paused\n    if (this._readableState.flowing !== false) this.resume();\n  } else if (ev === 'readable') {\n    var state = this._readableState;\n    if (!state.endEmitted && !state.readableListening) {\n      state.readableListening = state.needReadable = true;\n      state.emittedReadable = false;\n      if (!state.reading) {\n        pna.nextTick(nReadingNextTick, this);\n      } else if (state.length) {\n        emitReadable(this);\n      }\n    }\n  }\n\n  return res;\n};\nReadable.prototype.addListener = Readable.prototype.on;\n\nfunction nReadingNextTick(self) {\n  debug('readable nexttick read 0');\n  self.read(0);\n}\n\n// pause() and resume() are remnants of the legacy readable stream API\n// If the user uses them, then switch into old mode.\nReadable.prototype.resume = function () {\n  var state = this._readableState;\n  if (!state.flowing) {\n    debug('resume');\n    state.flowing = true;\n    resume(this, state);\n  }\n  return this;\n};\n\nfunction resume(stream, state) {\n  if (!state.resumeScheduled) {\n    state.resumeScheduled = true;\n    pna.nextTick(resume_, stream, state);\n  }\n}\n\nfunction resume_(stream, state) {\n  if (!state.reading) {\n    debug('resume read 0');\n    stream.read(0);\n  }\n\n  state.resumeScheduled = false;\n  state.awaitDrain = 0;\n  stream.emit('resume');\n  flow(stream);\n  if (state.flowing && !state.reading) stream.read(0);\n}\n\nReadable.prototype.pause = function () {\n  debug('call pause flowing=%j', this._readableState.flowing);\n  if (false !== this._readableState.flowing) {\n    debug('pause');\n    this._readableState.flowing = false;\n    this.emit('pause');\n  }\n  return this;\n};\n\nfunction flow(stream) {\n  var state = stream._readableState;\n  debug('flow', state.flowing);\n  while (state.flowing && stream.read() !== null) {}\n}\n\n// wrap an old-style stream as the async data source.\n// This is *not* part of the readable stream interface.\n// It is an ugly unfortunate mess of history.\nReadable.prototype.wrap = function (stream) {\n  var _this = this;\n\n  var state = this._readableState;\n  var paused = false;\n\n  stream.on('end', function () {\n    debug('wrapped end');\n    if (state.decoder && !state.ended) {\n      var chunk = state.decoder.end();\n      if (chunk && chunk.length) _this.push(chunk);\n    }\n\n    _this.push(null);\n  });\n\n  stream.on('data', function (chunk) {\n    debug('wrapped data');\n    if (state.decoder) chunk = state.decoder.write(chunk);\n\n    // don't skip over falsy values in objectMode\n    if (state.objectMode && (chunk === null || chunk === undefined)) return;else if (!state.objectMode && (!chunk || !chunk.length)) return;\n\n    var ret = _this.push(chunk);\n    if (!ret) {\n      paused = true;\n      stream.pause();\n    }\n  });\n\n  // proxy all the other methods.\n  // important when wrapping filters and duplexes.\n  for (var i in stream) {\n    if (this[i] === undefined && typeof stream[i] === 'function') {\n      this[i] = function (method) {\n        return function () {\n          return stream[method].apply(stream, arguments);\n        };\n      }(i);\n    }\n  }\n\n  // proxy certain important events.\n  for (var n = 0; n < kProxyEvents.length; n++) {\n    stream.on(kProxyEvents[n], this.emit.bind(this, kProxyEvents[n]));\n  }\n\n  // when we try to consume some more bytes, simply unpause the\n  // underlying stream.\n  this._read = function (n) {\n    debug('wrapped _read', n);\n    if (paused) {\n      paused = false;\n      stream.resume();\n    }\n  };\n\n  return this;\n};\n\nObject.defineProperty(Readable.prototype, 'readableHighWaterMark', {\n  // making it explicit this property is not enumerable\n  // because otherwise some prototype manipulation in\n  // userland will fail\n  enumerable: false,\n  get: function () {\n    return this._readableState.highWaterMark;\n  }\n});\n\n// exposed for testing purposes only.\nReadable._fromList = fromList;\n\n// Pluck off n bytes from an array of buffers.\n// Length is the combined lengths of all the buffers in the list.\n// This function is designed to be inlinable, so please take care when making\n// changes to the function body.\nfunction fromList(n, state) {\n  // nothing buffered\n  if (state.length === 0) return null;\n\n  var ret;\n  if (state.objectMode) ret = state.buffer.shift();else if (!n || n >= state.length) {\n    // read it all, truncate the list\n    if (state.decoder) ret = state.buffer.join('');else if (state.buffer.length === 1) ret = state.buffer.head.data;else ret = state.buffer.concat(state.length);\n    state.buffer.clear();\n  } else {\n    // read part of list\n    ret = fromListPartial(n, state.buffer, state.decoder);\n  }\n\n  return ret;\n}\n\n// Extracts only enough buffered data to satisfy the amount requested.\n// This function is designed to be inlinable, so please take care when making\n// changes to the function body.\nfunction fromListPartial(n, list, hasStrings) {\n  var ret;\n  if (n < list.head.data.length) {\n    // slice is the same for buffers and strings\n    ret = list.head.data.slice(0, n);\n    list.head.data = list.head.data.slice(n);\n  } else if (n === list.head.data.length) {\n    // first chunk is a perfect match\n    ret = list.shift();\n  } else {\n    // result spans more than one buffer\n    ret = hasStrings ? copyFromBufferString(n, list) : copyFromBuffer(n, list);\n  }\n  return ret;\n}\n\n// Copies a specified amount of characters from the list of buffered data\n// chunks.\n// This function is designed to be inlinable, so please take care when making\n// changes to the function body.\nfunction copyFromBufferString(n, list) {\n  var p = list.head;\n  var c = 1;\n  var ret = p.data;\n  n -= ret.length;\n  while (p = p.next) {\n    var str = p.data;\n    var nb = n > str.length ? str.length : n;\n    if (nb === str.length) ret += str;else ret += str.slice(0, n);\n    n -= nb;\n    if (n === 0) {\n      if (nb === str.length) {\n        ++c;\n        if (p.next) list.head = p.next;else list.head = list.tail = null;\n      } else {\n        list.head = p;\n        p.data = str.slice(nb);\n      }\n      break;\n    }\n    ++c;\n  }\n  list.length -= c;\n  return ret;\n}\n\n// Copies a specified amount of bytes from the list of buffered data chunks.\n// This function is designed to be inlinable, so please take care when making\n// changes to the function body.\nfunction copyFromBuffer(n, list) {\n  var ret = Buffer.allocUnsafe(n);\n  var p = list.head;\n  var c = 1;\n  p.data.copy(ret);\n  n -= p.data.length;\n  while (p = p.next) {\n    var buf = p.data;\n    var nb = n > buf.length ? buf.length : n;\n    buf.copy(ret, ret.length - n, 0, nb);\n    n -= nb;\n    if (n === 0) {\n      if (nb === buf.length) {\n        ++c;\n        if (p.next) list.head = p.next;else list.head = list.tail = null;\n      } else {\n        list.head = p;\n        p.data = buf.slice(nb);\n      }\n      break;\n    }\n    ++c;\n  }\n  list.length -= c;\n  return ret;\n}\n\nfunction endReadable(stream) {\n  var state = stream._readableState;\n\n  // If we get here before consuming all the bytes, then that is a\n  // bug in node.  Should never happen.\n  if (state.length > 0) throw new Error('\"endReadable()\" called on non-empty stream');\n\n  if (!state.endEmitted) {\n    state.ended = true;\n    pna.nextTick(endReadableNT, state, stream);\n  }\n}\n\nfunction endReadableNT(state, stream) {\n  // Check that we didn't get one last unshift.\n  if (!state.endEmitted && state.length === 0) {\n    state.endEmitted = true;\n    stream.readable = false;\n    stream.emit('end');\n  }\n}\n\nfunction indexOf(xs, x) {\n  for (var i = 0, l = xs.length; i < l; i++) {\n    if (xs[i] === x) return i;\n  }\n  return -1;\n}","// Copyright Joyent, Inc. and other Node contributors.\n//\n// Permission is hereby granted, free of charge, to any person obtaining a\n// copy of this software and associated documentation files (the\n// \"Software\"), to deal in the Software without restriction, including\n// without limitation the rights to use, copy, modify, merge, publish,\n// distribute, sublicense, and/or sell copies of the Software, and to permit\n// persons to whom the Software is furnished to do so, subject to the\n// following conditions:\n//\n// The above copyright notice and this permission notice shall be included\n// in all copies or substantial portions of the Software.\n//\n// THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS\n// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF\n// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN\n// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,\n// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR\n// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE\n// USE OR OTHER DEALINGS IN THE SOFTWARE.\n\n// a duplex stream is just a stream that is both readable and writable.\n// Since JS doesn't have multiple prototypal inheritance, this class\n// prototypally inherits from Readable, and then parasitically from\n// Writable.\n\n'use strict';\n\n/*<replacement>*/\n\nvar pna = require('process-nextick-args');\n/*</replacement>*/\n\n/*<replacement>*/\nvar objectKeys = Object.keys || function (obj) {\n  var keys = [];\n  for (var key in obj) {\n    keys.push(key);\n  }return keys;\n};\n/*</replacement>*/\n\nmodule.exports = Duplex;\n\n/*<replacement>*/\nvar util = Object.create(require('core-util-is'));\nutil.inherits = require('inherits');\n/*</replacement>*/\n\nvar Readable = require('./_stream_readable');\nvar Writable = require('./_stream_writable');\n\nutil.inherits(Duplex, Readable);\n\n{\n  // avoid scope creep, the keys array can then be collected\n  var keys = objectKeys(Writable.prototype);\n  for (var v = 0; v < keys.length; v++) {\n    var method = keys[v];\n    if (!Duplex.prototype[method]) Duplex.prototype[method] = Writable.prototype[method];\n  }\n}\n\nfunction Duplex(options) {\n  if (!(this instanceof Duplex)) return new Duplex(options);\n\n  Readable.call(this, options);\n  Writable.call(this, options);\n\n  if (options && options.readable === false) this.readable = false;\n\n  if (options && options.writable === false) this.writable = false;\n\n  this.allowHalfOpen = true;\n  if (options && options.allowHalfOpen === false) this.allowHalfOpen = false;\n\n  this.once('end', onend);\n}\n\nObject.defineProperty(Duplex.prototype, 'writableHighWaterMark', {\n  // making it explicit this property is not enumerable\n  // because otherwise some prototype manipulation in\n  // userland will fail\n  enumerable: false,\n  get: function () {\n    return this._writableState.highWaterMark;\n  }\n});\n\n// the no-half-open enforcer\nfunction onend() {\n  // if we allow half-open state, or if the writable side ended,\n  // then we're ok.\n  if (this.allowHalfOpen || this._writableState.ended) return;\n\n  // no more data can be written.\n  // But allow more writes to happen in this tick.\n  pna.nextTick(onEndNT, this);\n}\n\nfunction onEndNT(self) {\n  self.end();\n}\n\nObject.defineProperty(Duplex.prototype, 'destroyed', {\n  get: function () {\n    if (this._readableState === undefined || this._writableState === undefined) {\n      return false;\n    }\n    return this._readableState.destroyed && this._writableState.destroyed;\n  },\n  set: function (value) {\n    // we ignore the value if the stream\n    // has not been initialized yet\n    if (this._readableState === undefined || this._writableState === undefined) {\n      return;\n    }\n\n    // backward compatibility, the user is explicitly\n    // managing destroyed\n    this._readableState.destroyed = value;\n    this._writableState.destroyed = value;\n  }\n});\n\nDuplex.prototype._destroy = function (err, cb) {\n  this.push(null);\n  this.end();\n\n  pna.nextTick(cb, err);\n};","'use strict';\n\nexports.decode = exports.parse = require('./decode');\nexports.encode = exports.stringify = require('./encode');\n","'use strict'\nvar Buffer = require('buffer').Buffer\nvar inherits = require('inherits')\nvar HashBase = require('hash-base')\n\nvar ARRAY16 = new Array(16)\n\nvar zl = [\n  0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,\n  7, 4, 13, 1, 10, 6, 15, 3, 12, 0, 9, 5, 2, 14, 11, 8,\n  3, 10, 14, 4, 9, 15, 8, 1, 2, 7, 0, 6, 13, 11, 5, 12,\n  1, 9, 11, 10, 0, 8, 12, 4, 13, 3, 7, 15, 14, 5, 6, 2,\n  4, 0, 5, 9, 7, 12, 2, 10, 14, 1, 3, 8, 11, 6, 15, 13\n]\n\nvar zr = [\n  5, 14, 7, 0, 9, 2, 11, 4, 13, 6, 15, 8, 1, 10, 3, 12,\n  6, 11, 3, 7, 0, 13, 5, 10, 14, 15, 8, 12, 4, 9, 1, 2,\n  15, 5, 1, 3, 7, 14, 6, 9, 11, 8, 12, 2, 10, 0, 4, 13,\n  8, 6, 4, 1, 3, 11, 15, 0, 5, 12, 2, 13, 9, 7, 10, 14,\n  12, 15, 10, 4, 1, 5, 8, 7, 6, 2, 13, 14, 0, 3, 9, 11\n]\n\nvar sl = [\n  11, 14, 15, 12, 5, 8, 7, 9, 11, 13, 14, 15, 6, 7, 9, 8,\n  7, 6, 8, 13, 11, 9, 7, 15, 7, 12, 15, 9, 11, 7, 13, 12,\n  11, 13, 6, 7, 14, 9, 13, 15, 14, 8, 13, 6, 5, 12, 7, 5,\n  11, 12, 14, 15, 14, 15, 9, 8, 9, 14, 5, 6, 8, 6, 5, 12,\n  9, 15, 5, 11, 6, 8, 13, 12, 5, 12, 13, 14, 11, 8, 5, 6\n]\n\nvar sr = [\n  8, 9, 9, 11, 13, 15, 15, 5, 7, 7, 8, 11, 14, 14, 12, 6,\n  9, 13, 15, 7, 12, 8, 9, 11, 7, 7, 12, 7, 6, 15, 13, 11,\n  9, 7, 15, 11, 8, 6, 6, 14, 12, 13, 5, 14, 13, 13, 7, 5,\n  15, 5, 8, 11, 14, 14, 6, 14, 6, 9, 12, 9, 12, 5, 15, 8,\n  8, 5, 12, 9, 12, 5, 14, 6, 8, 13, 6, 5, 15, 13, 11, 11\n]\n\nvar hl = [0x00000000, 0x5a827999, 0x6ed9eba1, 0x8f1bbcdc, 0xa953fd4e]\nvar hr = [0x50a28be6, 0x5c4dd124, 0x6d703ef3, 0x7a6d76e9, 0x00000000]\n\nfunction RIPEMD160 () {\n  HashBase.call(this, 64)\n\n  // state\n  this._a = 0x67452301\n  this._b = 0xefcdab89\n  this._c = 0x98badcfe\n  this._d = 0x10325476\n  this._e = 0xc3d2e1f0\n}\n\ninherits(RIPEMD160, HashBase)\n\nRIPEMD160.prototype._update = function () {\n  var words = ARRAY16\n  for (var j = 0; j < 16; ++j) words[j] = this._block.readInt32LE(j * 4)\n\n  var al = this._a | 0\n  var bl = this._b | 0\n  var cl = this._c | 0\n  var dl = this._d | 0\n  var el = this._e | 0\n\n  var ar = this._a | 0\n  var br = this._b | 0\n  var cr = this._c | 0\n  var dr = this._d | 0\n  var er = this._e | 0\n\n  // computation\n  for (var i = 0; i < 80; i += 1) {\n    var tl\n    var tr\n    if (i < 16) {\n      tl = fn1(al, bl, cl, dl, el, words[zl[i]], hl[0], sl[i])\n      tr = fn5(ar, br, cr, dr, er, words[zr[i]], hr[0], sr[i])\n    } else if (i < 32) {\n      tl = fn2(al, bl, cl, dl, el, words[zl[i]], hl[1], sl[i])\n      tr = fn4(ar, br, cr, dr, er, words[zr[i]], hr[1], sr[i])\n    } else if (i < 48) {\n      tl = fn3(al, bl, cl, dl, el, words[zl[i]], hl[2], sl[i])\n      tr = fn3(ar, br, cr, dr, er, words[zr[i]], hr[2], sr[i])\n    } else if (i < 64) {\n      tl = fn4(al, bl, cl, dl, el, words[zl[i]], hl[3], sl[i])\n      tr = fn2(ar, br, cr, dr, er, words[zr[i]], hr[3], sr[i])\n    } else { // if (i<80) {\n      tl = fn5(al, bl, cl, dl, el, words[zl[i]], hl[4], sl[i])\n      tr = fn1(ar, br, cr, dr, er, words[zr[i]], hr[4], sr[i])\n    }\n\n    al = el\n    el = dl\n    dl = rotl(cl, 10)\n    cl = bl\n    bl = tl\n\n    ar = er\n    er = dr\n    dr = rotl(cr, 10)\n    cr = br\n    br = tr\n  }\n\n  // update state\n  var t = (this._b + cl + dr) | 0\n  this._b = (this._c + dl + er) | 0\n  this._c = (this._d + el + ar) | 0\n  this._d = (this._e + al + br) | 0\n  this._e = (this._a + bl + cr) | 0\n  this._a = t\n}\n\nRIPEMD160.prototype._digest = function () {\n  // create padding and handle blocks\n  this._block[this._blockOffset++] = 0x80\n  if (this._blockOffset > 56) {\n    this._block.fill(0, this._blockOffset, 64)\n    this._update()\n    this._blockOffset = 0\n  }\n\n  this._block.fill(0, this._blockOffset, 56)\n  this._block.writeUInt32LE(this._length[0], 56)\n  this._block.writeUInt32LE(this._length[1], 60)\n  this._update()\n\n  // produce result\n  var buffer = Buffer.alloc ? Buffer.alloc(20) : new Buffer(20)\n  buffer.writeInt32LE(this._a, 0)\n  buffer.writeInt32LE(this._b, 4)\n  buffer.writeInt32LE(this._c, 8)\n  buffer.writeInt32LE(this._d, 12)\n  buffer.writeInt32LE(this._e, 16)\n  return buffer\n}\n\nfunction rotl (x, n) {\n  return (x << n) | (x >>> (32 - n))\n}\n\nfunction fn1 (a, b, c, d, e, m, k, s) {\n  return (rotl((a + (b ^ c ^ d) + m + k) | 0, s) + e) | 0\n}\n\nfunction fn2 (a, b, c, d, e, m, k, s) {\n  return (rotl((a + ((b & c) | ((~b) & d)) + m + k) | 0, s) + e) | 0\n}\n\nfunction fn3 (a, b, c, d, e, m, k, s) {\n  return (rotl((a + ((b | (~c)) ^ d) + m + k) | 0, s) + e) | 0\n}\n\nfunction fn4 (a, b, c, d, e, m, k, s) {\n  return (rotl((a + ((b & d) | (c & (~d))) + m + k) | 0, s) + e) | 0\n}\n\nfunction fn5 (a, b, c, d, e, m, k, s) {\n  return (rotl((a + (b ^ (c | (~d))) + m + k) | 0, s) + e) | 0\n}\n\nmodule.exports = RIPEMD160\n","'use strict'\n\nfunction formatHostname (hostname) {\n  // canonicalize the hostname, so that 'oogle.com' won't match 'google.com'\n  return hostname.replace(/^\\.*/, '.').toLowerCase()\n}\n\nfunction parseNoProxyZone (zone) {\n  zone = zone.trim().toLowerCase()\n\n  var zoneParts = zone.split(':', 2)\n  var zoneHost = formatHostname(zoneParts[0])\n  var zonePort = zoneParts[1]\n  var hasPort = zone.indexOf(':') > -1\n\n  return {hostname: zoneHost, port: zonePort, hasPort: hasPort}\n}\n\nfunction uriInNoProxy (uri, noProxy) {\n  var port = uri.port || (uri.protocol === 'https:' ? '443' : '80')\n  var hostname = formatHostname(uri.hostname)\n  var noProxyList = noProxy.split(',')\n\n  // iterate through the noProxyList until it finds a match.\n  return noProxyList.map(parseNoProxyZone).some(function (noProxyZone) {\n    var isMatchedAt = hostname.indexOf(noProxyZone.hostname)\n    var hostnameMatched = (\n      isMatchedAt > -1 &&\n        (isMatchedAt === hostname.length - noProxyZone.hostname.length)\n    )\n\n    if (noProxyZone.hasPort) {\n      return (port === noProxyZone.port) && hostnameMatched\n    }\n\n    return hostnameMatched\n  })\n}\n\nfunction getProxyFromURI (uri) {\n  // Decide the proper request proxy to use based on the request URI object and the\n  // environmental variables (NO_PROXY, HTTP_PROXY, etc.)\n  // respect NO_PROXY environment variables (see: https://lynx.invisible-island.net/lynx2.8.7/breakout/lynx_help/keystrokes/environments.html)\n\n  var noProxy = process.env.NO_PROXY || process.env.no_proxy || ''\n\n  // if the noProxy is a wildcard then return null\n\n  if (noProxy === '*') {\n    return null\n  }\n\n  // if the noProxy is not empty and the uri is found return null\n\n  if (noProxy !== '' && uriInNoProxy(uri, noProxy)) {\n    return null\n  }\n\n  // Check for HTTP or HTTPS Proxy in environment Else default to null\n\n  if (uri.protocol === 'http:') {\n    return process.env.HTTP_PROXY ||\n      process.env.http_proxy || null\n  }\n\n  if (uri.protocol === 'https:') {\n    return process.env.HTTPS_PROXY ||\n      process.env.https_proxy ||\n      process.env.HTTP_PROXY ||\n      process.env.http_proxy || null\n  }\n\n  // if none of that works, return null\n  // (What uri protocol are you using then?)\n\n  return null\n}\n\nmodule.exports = getProxyFromURI\n","module.exports = require('./readable').PassThrough\n","'use strict'\n\nvar url = require('url')\nvar qs = require('qs')\nvar caseless = require('caseless')\nvar uuid = require('uuid/v4')\nvar oauth = require('oauth-sign')\nvar crypto = require('crypto')\nvar Buffer = require('safe-buffer').Buffer\n\nfunction OAuth (request) {\n  this.request = request\n  this.params = null\n}\n\nOAuth.prototype.buildParams = function (_oauth, uri, method, query, form, qsLib) {\n  var oa = {}\n  for (var i in _oauth) {\n    oa['oauth_' + i] = _oauth[i]\n  }\n  if (!oa.oauth_version) {\n    oa.oauth_version = '1.0'\n  }\n  if (!oa.oauth_timestamp) {\n    oa.oauth_timestamp = Math.floor(Date.now() / 1000).toString()\n  }\n  if (!oa.oauth_nonce) {\n    oa.oauth_nonce = uuid().replace(/-/g, '')\n  }\n  if (!oa.oauth_signature_method) {\n    oa.oauth_signature_method = 'HMAC-SHA1'\n  }\n\n  var consumer_secret_or_private_key = oa.oauth_consumer_secret || oa.oauth_private_key // eslint-disable-line camelcase\n  delete oa.oauth_consumer_secret\n  delete oa.oauth_private_key\n\n  var token_secret = oa.oauth_token_secret // eslint-disable-line camelcase\n  delete oa.oauth_token_secret\n\n  var realm = oa.oauth_realm\n  delete oa.oauth_realm\n  delete oa.oauth_transport_method\n\n  var baseurl = uri.protocol + '//' + uri.host + uri.pathname\n  var params = qsLib.parse([].concat(query, form, qsLib.stringify(oa)).join('&'))\n\n  oa.oauth_signature = oauth.sign(\n    oa.oauth_signature_method,\n    method,\n    baseurl,\n    params,\n    consumer_secret_or_private_key, // eslint-disable-line camelcase\n    token_secret // eslint-disable-line camelcase\n  )\n\n  if (realm) {\n    oa.realm = realm\n  }\n\n  return oa\n}\n\nOAuth.prototype.buildBodyHash = function (_oauth, body) {\n  if (['HMAC-SHA1', 'RSA-SHA1'].indexOf(_oauth.signature_method || 'HMAC-SHA1') < 0) {\n    this.request.emit('error', new Error('oauth: ' + _oauth.signature_method +\n      ' signature_method not supported with body_hash signing.'))\n  }\n\n  var shasum = crypto.createHash('sha1')\n  shasum.update(body || '')\n  var sha1 = shasum.digest('hex')\n\n  return Buffer.from(sha1, 'hex').toString('base64')\n}\n\nOAuth.prototype.concatParams = function (oa, sep, wrap) {\n  wrap = wrap || ''\n\n  var params = Object.keys(oa).filter(function (i) {\n    return i !== 'realm' && i !== 'oauth_signature'\n  }).sort()\n\n  if (oa.realm) {\n    params.splice(0, 0, 'realm')\n  }\n  params.push('oauth_signature')\n\n  return params.map(function (i) {\n    return i + '=' + wrap + oauth.rfc3986(oa[i]) + wrap\n  }).join(sep)\n}\n\nOAuth.prototype.onRequest = function (_oauth) {\n  var self = this\n  self.params = _oauth\n\n  var uri = self.request.uri || {}\n  var method = self.request.method || ''\n  var headers = caseless(self.request.headers)\n  var body = self.request.body || ''\n  var qsLib = self.request.qsLib || qs\n\n  var form\n  var query\n  var contentType = headers.get('content-type') || ''\n  var formContentType = 'application/x-www-form-urlencoded'\n  var transport = _oauth.transport_method || 'header'\n\n  if (contentType.slice(0, formContentType.length) === formContentType) {\n    contentType = formContentType\n    form = body\n  }\n  if (uri.query) {\n    query = uri.query\n  }\n  if (transport === 'body' && (method !== 'POST' || contentType !== formContentType)) {\n    self.request.emit('error', new Error('oauth: transport_method of body requires POST ' +\n      'and content-type ' + formContentType))\n  }\n\n  if (!form && typeof _oauth.body_hash === 'boolean') {\n    _oauth.body_hash = self.buildBodyHash(_oauth, self.request.body.toString())\n  }\n\n  var oa = self.buildParams(_oauth, uri, method, query, form, qsLib)\n\n  switch (transport) {\n    case 'header':\n      self.request.setHeader('Authorization', 'OAuth ' + self.concatParams(oa, ',', '\"'))\n      break\n\n    case 'query':\n      var href = self.request.uri.href += (query ? '&' : '?') + self.concatParams(oa, '&')\n      self.request.uri = url.parse(href)\n      self.request.path = self.request.uri.path\n      break\n\n    case 'body':\n      self.request.body = (form ? form + '&' : '') + self.concatParams(oa, '&')\n      break\n\n    default:\n      self.request.emit('error', new Error('oauth: transport_method invalid'))\n  }\n}\n\nexports.OAuth = OAuth\n","'use strict'\n\nvar fs = require('fs')\nvar qs = require('querystring')\nvar validate = require('har-validator')\nvar extend = require('extend')\n\nfunction Har (request) {\n  this.request = request\n}\n\nHar.prototype.reducer = function (obj, pair) {\n  // new property ?\n  if (obj[pair.name] === undefined) {\n    obj[pair.name] = pair.value\n    return obj\n  }\n\n  // existing? convert to array\n  var arr = [\n    obj[pair.name],\n    pair.value\n  ]\n\n  obj[pair.name] = arr\n\n  return obj\n}\n\nHar.prototype.prep = function (data) {\n  // construct utility properties\n  data.queryObj = {}\n  data.headersObj = {}\n  data.postData.jsonObj = false\n  data.postData.paramsObj = false\n\n  // construct query objects\n  if (data.queryString && data.queryString.length) {\n    data.queryObj = data.queryString.reduce(this.reducer, {})\n  }\n\n  // construct headers objects\n  if (data.headers && data.headers.length) {\n    // loweCase header keys\n    data.headersObj = data.headers.reduceRight(function (headers, header) {\n      headers[header.name] = header.value\n      return headers\n    }, {})\n  }\n\n  // construct Cookie header\n  if (data.cookies && data.cookies.length) {\n    var cookies = data.cookies.map(function (cookie) {\n      return cookie.name + '=' + cookie.value\n    })\n\n    if (cookies.length) {\n      data.headersObj.cookie = cookies.join('; ')\n    }\n  }\n\n  // prep body\n  function some (arr) {\n    return arr.some(function (type) {\n      return data.postData.mimeType.indexOf(type) === 0\n    })\n  }\n\n  if (some([\n    'multipart/mixed',\n    'multipart/related',\n    'multipart/form-data',\n    'multipart/alternative'])) {\n    // reset values\n    data.postData.mimeType = 'multipart/form-data'\n  } else if (some([\n    'application/x-www-form-urlencoded'])) {\n    if (!data.postData.params) {\n      data.postData.text = ''\n    } else {\n      data.postData.paramsObj = data.postData.params.reduce(this.reducer, {})\n\n      // always overwrite\n      data.postData.text = qs.stringify(data.postData.paramsObj)\n    }\n  } else if (some([\n    'text/json',\n    'text/x-json',\n    'application/json',\n    'application/x-json'])) {\n    data.postData.mimeType = 'application/json'\n\n    if (data.postData.text) {\n      try {\n        data.postData.jsonObj = JSON.parse(data.postData.text)\n      } catch (e) {\n        this.request.debug(e)\n\n        // force back to text/plain\n        data.postData.mimeType = 'text/plain'\n      }\n    }\n  }\n\n  return data\n}\n\nHar.prototype.options = function (options) {\n  // skip if no har property defined\n  if (!options.har) {\n    return options\n  }\n\n  var har = {}\n  extend(har, options.har)\n\n  // only process the first entry\n  if (har.log && har.log.entries) {\n    har = har.log.entries[0]\n  }\n\n  // add optional properties to make validation successful\n  har.url = har.url || options.url || options.uri || options.baseUrl || '/'\n  har.httpVersion = har.httpVersion || 'HTTP/1.1'\n  har.queryString = har.queryString || []\n  har.headers = har.headers || []\n  har.cookies = har.cookies || []\n  har.postData = har.postData || {}\n  har.postData.mimeType = har.postData.mimeType || 'application/octet-stream'\n\n  har.bodySize = 0\n  har.headersSize = 0\n  har.postData.size = 0\n\n  if (!validate.request(har)) {\n    return options\n  }\n\n  // clean up and get some utility properties\n  var req = this.prep(har)\n\n  // construct new options\n  if (req.url) {\n    options.url = req.url\n  }\n\n  if (req.method) {\n    options.method = req.method\n  }\n\n  if (Object.keys(req.queryObj).length) {\n    options.qs = req.queryObj\n  }\n\n  if (Object.keys(req.headersObj).length) {\n    options.headers = req.headersObj\n  }\n\n  function test (type) {\n    return req.postData.mimeType.indexOf(type) === 0\n  }\n  if (test('application/x-www-form-urlencoded')) {\n    options.form = req.postData.paramsObj\n  } else if (test('application/json')) {\n    if (req.postData.jsonObj) {\n      options.body = req.postData.jsonObj\n      options.json = true\n    }\n  } else if (test('multipart/form-data')) {\n    options.formData = {}\n\n    req.postData.params.forEach(function (param) {\n      var attachment = {}\n\n      if (!param.fileName && !param.contentType) {\n        options.formData[param.name] = param.value\n        return\n      }\n\n      // attempt to read from disk!\n      if (param.fileName && !param.value) {\n        attachment.value = fs.createReadStream(param.fileName)\n      } else if (param.value) {\n        attachment.value = param.value\n      }\n\n      if (param.fileName) {\n        attachment.options = {\n          filename: param.fileName,\n          contentType: param.contentType ? param.contentType : null\n        }\n      }\n\n      options.formData[param.name] = attachment\n    })\n  } else {\n    if (req.postData.text) {\n      options.body = req.postData.text\n    }\n  }\n\n  return options\n}\n\nexports.Har = Har\n","module.exports = require('./readable').Transform\n","// Copyright Joyent, Inc. and other Node contributors.\n//\n// Permission is hereby granted, free of charge, to any person obtaining a\n// copy of this software and associated documentation files (the\n// \"Software\"), to deal in the Software without restriction, including\n// without limitation the rights to use, copy, modify, merge, publish,\n// distribute, sublicense, and/or sell copies of the Software, and to permit\n// persons to whom the Software is furnished to do so, subject to the\n// following conditions:\n//\n// The above copyright notice and this permission notice shall be included\n// in all copies or substantial portions of the Software.\n//\n// THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS\n// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF\n// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN\n// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,\n// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR\n// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE\n// USE OR OTHER DEALINGS IN THE SOFTWARE.\n\n// A bit simpler than readable streams.\n// Implement an async ._write(chunk, encoding, cb), and it'll handle all\n// the drain event emission and buffering.\n\n'use strict';\n\n/*<replacement>*/\n\nvar pna = require('process-nextick-args');\n/*</replacement>*/\n\nmodule.exports = Writable;\n\n/* <replacement> */\nfunction WriteReq(chunk, encoding, cb) {\n  this.chunk = chunk;\n  this.encoding = encoding;\n  this.callback = cb;\n  this.next = null;\n}\n\n// It seems a linked list but it is not\n// there will be only 2 of these for each stream\nfunction CorkedRequest(state) {\n  var _this = this;\n\n  this.next = null;\n  this.entry = null;\n  this.finish = function () {\n    onCorkedFinish(_this, state);\n  };\n}\n/* </replacement> */\n\n/*<replacement>*/\nvar asyncWrite = !process.browser && ['v0.10', 'v0.9.'].indexOf(process.version.slice(0, 5)) > -1 ? setImmediate : pna.nextTick;\n/*</replacement>*/\n\n/*<replacement>*/\nvar Duplex;\n/*</replacement>*/\n\nWritable.WritableState = WritableState;\n\n/*<replacement>*/\nvar util = Object.create(require('core-util-is'));\nutil.inherits = require('inherits');\n/*</replacement>*/\n\n/*<replacement>*/\nvar internalUtil = {\n  deprecate: require('util-deprecate')\n};\n/*</replacement>*/\n\n/*<replacement>*/\nvar Stream = require('./internal/streams/stream');\n/*</replacement>*/\n\n/*<replacement>*/\n\nvar Buffer = require('safe-buffer').Buffer;\nvar OurUint8Array = global.Uint8Array || function () {};\nfunction _uint8ArrayToBuffer(chunk) {\n  return Buffer.from(chunk);\n}\nfunction _isUint8Array(obj) {\n  return Buffer.isBuffer(obj) || obj instanceof OurUint8Array;\n}\n\n/*</replacement>*/\n\nvar destroyImpl = require('./internal/streams/destroy');\n\nutil.inherits(Writable, Stream);\n\nfunction nop() {}\n\nfunction WritableState(options, stream) {\n  Duplex = Duplex || require('./_stream_duplex');\n\n  options = options || {};\n\n  // Duplex streams are both readable and writable, but share\n  // the same options object.\n  // However, some cases require setting options to different\n  // values for the readable and the writable sides of the duplex stream.\n  // These options can be provided separately as readableXXX and writableXXX.\n  var isDuplex = stream instanceof Duplex;\n\n  // object stream flag to indicate whether or not this stream\n  // contains buffers or objects.\n  this.objectMode = !!options.objectMode;\n\n  if (isDuplex) this.objectMode = this.objectMode || !!options.writableObjectMode;\n\n  // the point at which write() starts returning false\n  // Note: 0 is a valid value, means that we always return false if\n  // the entire buffer is not flushed immediately on write()\n  var hwm = options.highWaterMark;\n  var writableHwm = options.writableHighWaterMark;\n  var defaultHwm = this.objectMode ? 16 : 16 * 1024;\n\n  if (hwm || hwm === 0) this.highWaterMark = hwm;else if (isDuplex && (writableHwm || writableHwm === 0)) this.highWaterMark = writableHwm;else this.highWaterMark = defaultHwm;\n\n  // cast to ints.\n  this.highWaterMark = Math.floor(this.highWaterMark);\n\n  // if _final has been called\n  this.finalCalled = false;\n\n  // drain event flag.\n  this.needDrain = false;\n  // at the start of calling end()\n  this.ending = false;\n  // when end() has been called, and returned\n  this.ended = false;\n  // when 'finish' is emitted\n  this.finished = false;\n\n  // has it been destroyed\n  this.destroyed = false;\n\n  // should we decode strings into buffers before passing to _write?\n  // this is here so that some node-core streams can optimize string\n  // handling at a lower level.\n  var noDecode = options.decodeStrings === false;\n  this.decodeStrings = !noDecode;\n\n  // Crypto is kind of old and crusty.  Historically, its default string\n  // encoding is 'binary' so we have to make this configurable.\n  // Everything else in the universe uses 'utf8', though.\n  this.defaultEncoding = options.defaultEncoding || 'utf8';\n\n  // not an actual buffer we keep track of, but a measurement\n  // of how much we're waiting to get pushed to some underlying\n  // socket or file.\n  this.length = 0;\n\n  // a flag to see when we're in the middle of a write.\n  this.writing = false;\n\n  // when true all writes will be buffered until .uncork() call\n  this.corked = 0;\n\n  // a flag to be able to tell if the onwrite cb is called immediately,\n  // or on a later tick.  We set this to true at first, because any\n  // actions that shouldn't happen until \"later\" should generally also\n  // not happen before the first write call.\n  this.sync = true;\n\n  // a flag to know if we're processing previously buffered items, which\n  // may call the _write() callback in the same tick, so that we don't\n  // end up in an overlapped onwrite situation.\n  this.bufferProcessing = false;\n\n  // the callback that's passed to _write(chunk,cb)\n  this.onwrite = function (er) {\n    onwrite(stream, er);\n  };\n\n  // the callback that the user supplies to write(chunk,encoding,cb)\n  this.writecb = null;\n\n  // the amount that is being written when _write is called.\n  this.writelen = 0;\n\n  this.bufferedRequest = null;\n  this.lastBufferedRequest = null;\n\n  // number of pending user-supplied write callbacks\n  // this must be 0 before 'finish' can be emitted\n  this.pendingcb = 0;\n\n  // emit prefinish if the only thing we're waiting for is _write cbs\n  // This is relevant for synchronous Transform streams\n  this.prefinished = false;\n\n  // True if the error was already emitted and should not be thrown again\n  this.errorEmitted = false;\n\n  // count buffered requests\n  this.bufferedRequestCount = 0;\n\n  // allocate the first CorkedRequest, there is always\n  // one allocated and free to use, and we maintain at most two\n  this.corkedRequestsFree = new CorkedRequest(this);\n}\n\nWritableState.prototype.getBuffer = function getBuffer() {\n  var current = this.bufferedRequest;\n  var out = [];\n  while (current) {\n    out.push(current);\n    current = current.next;\n  }\n  return out;\n};\n\n(function () {\n  try {\n    Object.defineProperty(WritableState.prototype, 'buffer', {\n      get: internalUtil.deprecate(function () {\n        return this.getBuffer();\n      }, '_writableState.buffer is deprecated. Use _writableState.getBuffer ' + 'instead.', 'DEP0003')\n    });\n  } catch (_) {}\n})();\n\n// Test _writableState for inheritance to account for Duplex streams,\n// whose prototype chain only points to Readable.\nvar realHasInstance;\nif (typeof Symbol === 'function' && Symbol.hasInstance && typeof Function.prototype[Symbol.hasInstance] === 'function') {\n  realHasInstance = Function.prototype[Symbol.hasInstance];\n  Object.defineProperty(Writable, Symbol.hasInstance, {\n    value: function (object) {\n      if (realHasInstance.call(this, object)) return true;\n      if (this !== Writable) return false;\n\n      return object && object._writableState instanceof WritableState;\n    }\n  });\n} else {\n  realHasInstance = function (object) {\n    return object instanceof this;\n  };\n}\n\nfunction Writable(options) {\n  Duplex = Duplex || require('./_stream_duplex');\n\n  // Writable ctor is applied to Duplexes, too.\n  // `realHasInstance` is necessary because using plain `instanceof`\n  // would return false, as no `_writableState` property is attached.\n\n  // Trying to use the custom `instanceof` for Writable here will also break the\n  // Node.js LazyTransform implementation, which has a non-trivial getter for\n  // `_writableState` that would lead to infinite recursion.\n  if (!realHasInstance.call(Writable, this) && !(this instanceof Duplex)) {\n    return new Writable(options);\n  }\n\n  this._writableState = new WritableState(options, this);\n\n  // legacy.\n  this.writable = true;\n\n  if (options) {\n    if (typeof options.write === 'function') this._write = options.write;\n\n    if (typeof options.writev === 'function') this._writev = options.writev;\n\n    if (typeof options.destroy === 'function') this._destroy = options.destroy;\n\n    if (typeof options.final === 'function') this._final = options.final;\n  }\n\n  Stream.call(this);\n}\n\n// Otherwise people can pipe Writable streams, which is just wrong.\nWritable.prototype.pipe = function () {\n  this.emit('error', new Error('Cannot pipe, not readable'));\n};\n\nfunction writeAfterEnd(stream, cb) {\n  var er = new Error('write after end');\n  // TODO: defer error events consistently everywhere, not just the cb\n  stream.emit('error', er);\n  pna.nextTick(cb, er);\n}\n\n// Checks that a user-supplied chunk is valid, especially for the particular\n// mode the stream is in. Currently this means that `null` is never accepted\n// and undefined/non-string values are only allowed in object mode.\nfunction validChunk(stream, state, chunk, cb) {\n  var valid = true;\n  var er = false;\n\n  if (chunk === null) {\n    er = new TypeError('May not write null values to stream');\n  } else if (typeof chunk !== 'string' && chunk !== undefined && !state.objectMode) {\n    er = new TypeError('Invalid non-string/buffer chunk');\n  }\n  if (er) {\n    stream.emit('error', er);\n    pna.nextTick(cb, er);\n    valid = false;\n  }\n  return valid;\n}\n\nWritable.prototype.write = function (chunk, encoding, cb) {\n  var state = this._writableState;\n  var ret = false;\n  var isBuf = !state.objectMode && _isUint8Array(chunk);\n\n  if (isBuf && !Buffer.isBuffer(chunk)) {\n    chunk = _uint8ArrayToBuffer(chunk);\n  }\n\n  if (typeof encoding === 'function') {\n    cb = encoding;\n    encoding = null;\n  }\n\n  if (isBuf) encoding = 'buffer';else if (!encoding) encoding = state.defaultEncoding;\n\n  if (typeof cb !== 'function') cb = nop;\n\n  if (state.ended) writeAfterEnd(this, cb);else if (isBuf || validChunk(this, state, chunk, cb)) {\n    state.pendingcb++;\n    ret = writeOrBuffer(this, state, isBuf, chunk, encoding, cb);\n  }\n\n  return ret;\n};\n\nWritable.prototype.cork = function () {\n  var state = this._writableState;\n\n  state.corked++;\n};\n\nWritable.prototype.uncork = function () {\n  var state = this._writableState;\n\n  if (state.corked) {\n    state.corked--;\n\n    if (!state.writing && !state.corked && !state.finished && !state.bufferProcessing && state.bufferedRequest) clearBuffer(this, state);\n  }\n};\n\nWritable.prototype.setDefaultEncoding = function setDefaultEncoding(encoding) {\n  // node::ParseEncoding() requires lower case.\n  if (typeof encoding === 'string') encoding = encoding.toLowerCase();\n  if (!(['hex', 'utf8', 'utf-8', 'ascii', 'binary', 'base64', 'ucs2', 'ucs-2', 'utf16le', 'utf-16le', 'raw'].indexOf((encoding + '').toLowerCase()) > -1)) throw new TypeError('Unknown encoding: ' + encoding);\n  this._writableState.defaultEncoding = encoding;\n  return this;\n};\n\nfunction decodeChunk(state, chunk, encoding) {\n  if (!state.objectMode && state.decodeStrings !== false && typeof chunk === 'string') {\n    chunk = Buffer.from(chunk, encoding);\n  }\n  return chunk;\n}\n\nObject.defineProperty(Writable.prototype, 'writableHighWaterMark', {\n  // making it explicit this property is not enumerable\n  // because otherwise some prototype manipulation in\n  // userland will fail\n  enumerable: false,\n  get: function () {\n    return this._writableState.highWaterMark;\n  }\n});\n\n// if we're already writing something, then just put this\n// in the queue, and wait our turn.  Otherwise, call _write\n// If we return false, then we need a drain event, so set that flag.\nfunction writeOrBuffer(stream, state, isBuf, chunk, encoding, cb) {\n  if (!isBuf) {\n    var newChunk = decodeChunk(state, chunk, encoding);\n    if (chunk !== newChunk) {\n      isBuf = true;\n      encoding = 'buffer';\n      chunk = newChunk;\n    }\n  }\n  var len = state.objectMode ? 1 : chunk.length;\n\n  state.length += len;\n\n  var ret = state.length < state.highWaterMark;\n  // we must ensure that previous needDrain will not be reset to false.\n  if (!ret) state.needDrain = true;\n\n  if (state.writing || state.corked) {\n    var last = state.lastBufferedRequest;\n    state.lastBufferedRequest = {\n      chunk: chunk,\n      encoding: encoding,\n      isBuf: isBuf,\n      callback: cb,\n      next: null\n    };\n    if (last) {\n      last.next = state.lastBufferedRequest;\n    } else {\n      state.bufferedRequest = state.lastBufferedRequest;\n    }\n    state.bufferedRequestCount += 1;\n  } else {\n    doWrite(stream, state, false, len, chunk, encoding, cb);\n  }\n\n  return ret;\n}\n\nfunction doWrite(stream, state, writev, len, chunk, encoding, cb) {\n  state.writelen = len;\n  state.writecb = cb;\n  state.writing = true;\n  state.sync = true;\n  if (writev) stream._writev(chunk, state.onwrite);else stream._write(chunk, encoding, state.onwrite);\n  state.sync = false;\n}\n\nfunction onwriteError(stream, state, sync, er, cb) {\n  --state.pendingcb;\n\n  if (sync) {\n    // defer the callback if we are being called synchronously\n    // to avoid piling up things on the stack\n    pna.nextTick(cb, er);\n    // this can emit finish, and it will always happen\n    // after error\n    pna.nextTick(finishMaybe, stream, state);\n    stream._writableState.errorEmitted = true;\n    stream.emit('error', er);\n  } else {\n    // the caller expect this to happen before if\n    // it is async\n    cb(er);\n    stream._writableState.errorEmitted = true;\n    stream.emit('error', er);\n    // this can emit finish, but finish must\n    // always follow error\n    finishMaybe(stream, state);\n  }\n}\n\nfunction onwriteStateUpdate(state) {\n  state.writing = false;\n  state.writecb = null;\n  state.length -= state.writelen;\n  state.writelen = 0;\n}\n\nfunction onwrite(stream, er) {\n  var state = stream._writableState;\n  var sync = state.sync;\n  var cb = state.writecb;\n\n  onwriteStateUpdate(state);\n\n  if (er) onwriteError(stream, state, sync, er, cb);else {\n    // Check if we're actually ready to finish, but don't emit yet\n    var finished = needFinish(state);\n\n    if (!finished && !state.corked && !state.bufferProcessing && state.bufferedRequest) {\n      clearBuffer(stream, state);\n    }\n\n    if (sync) {\n      /*<replacement>*/\n      asyncWrite(afterWrite, stream, state, finished, cb);\n      /*</replacement>*/\n    } else {\n      afterWrite(stream, state, finished, cb);\n    }\n  }\n}\n\nfunction afterWrite(stream, state, finished, cb) {\n  if (!finished) onwriteDrain(stream, state);\n  state.pendingcb--;\n  cb();\n  finishMaybe(stream, state);\n}\n\n// Must force callback to be called on nextTick, so that we don't\n// emit 'drain' before the write() consumer gets the 'false' return\n// value, and has a chance to attach a 'drain' listener.\nfunction onwriteDrain(stream, state) {\n  if (state.length === 0 && state.needDrain) {\n    state.needDrain = false;\n    stream.emit('drain');\n  }\n}\n\n// if there's something in the buffer waiting, then process it\nfunction clearBuffer(stream, state) {\n  state.bufferProcessing = true;\n  var entry = state.bufferedRequest;\n\n  if (stream._writev && entry && entry.next) {\n    // Fast case, write everything using _writev()\n    var l = state.bufferedRequestCount;\n    var buffer = new Array(l);\n    var holder = state.corkedRequestsFree;\n    holder.entry = entry;\n\n    var count = 0;\n    var allBuffers = true;\n    while (entry) {\n      buffer[count] = entry;\n      if (!entry.isBuf) allBuffers = false;\n      entry = entry.next;\n      count += 1;\n    }\n    buffer.allBuffers = allBuffers;\n\n    doWrite(stream, state, true, state.length, buffer, '', holder.finish);\n\n    // doWrite is almost always async, defer these to save a bit of time\n    // as the hot path ends with doWrite\n    state.pendingcb++;\n    state.lastBufferedRequest = null;\n    if (holder.next) {\n      state.corkedRequestsFree = holder.next;\n      holder.next = null;\n    } else {\n      state.corkedRequestsFree = new CorkedRequest(state);\n    }\n    state.bufferedRequestCount = 0;\n  } else {\n    // Slow case, write chunks one-by-one\n    while (entry) {\n      var chunk = entry.chunk;\n      var encoding = entry.encoding;\n      var cb = entry.callback;\n      var len = state.objectMode ? 1 : chunk.length;\n\n      doWrite(stream, state, false, len, chunk, encoding, cb);\n      entry = entry.next;\n      state.bufferedRequestCount--;\n      // if we didn't call the onwrite immediately, then\n      // it means that we need to wait until it does.\n      // also, that means that the chunk and cb are currently\n      // being processed, so move the buffer counter past them.\n      if (state.writing) {\n        break;\n      }\n    }\n\n    if (entry === null) state.lastBufferedRequest = null;\n  }\n\n  state.bufferedRequest = entry;\n  state.bufferProcessing = false;\n}\n\nWritable.prototype._write = function (chunk, encoding, cb) {\n  cb(new Error('_write() is not implemented'));\n};\n\nWritable.prototype._writev = null;\n\nWritable.prototype.end = function (chunk, encoding, cb) {\n  var state = this._writableState;\n\n  if (typeof chunk === 'function') {\n    cb = chunk;\n    chunk = null;\n    encoding = null;\n  } else if (typeof encoding === 'function') {\n    cb = encoding;\n    encoding = null;\n  }\n\n  if (chunk !== null && chunk !== undefined) this.write(chunk, encoding);\n\n  // .end() fully uncorks\n  if (state.corked) {\n    state.corked = 1;\n    this.uncork();\n  }\n\n  // ignore unnecessary end() calls.\n  if (!state.ending && !state.finished) endWritable(this, state, cb);\n};\n\nfunction needFinish(state) {\n  return state.ending && state.length === 0 && state.bufferedRequest === null && !state.finished && !state.writing;\n}\nfunction callFinal(stream, state) {\n  stream._final(function (err) {\n    state.pendingcb--;\n    if (err) {\n      stream.emit('error', err);\n    }\n    state.prefinished = true;\n    stream.emit('prefinish');\n    finishMaybe(stream, state);\n  });\n}\nfunction prefinish(stream, state) {\n  if (!state.prefinished && !state.finalCalled) {\n    if (typeof stream._final === 'function') {\n      state.pendingcb++;\n      state.finalCalled = true;\n      pna.nextTick(callFinal, stream, state);\n    } else {\n      state.prefinished = true;\n      stream.emit('prefinish');\n    }\n  }\n}\n\nfunction finishMaybe(stream, state) {\n  var need = needFinish(state);\n  if (need) {\n    prefinish(stream, state);\n    if (state.pendingcb === 0) {\n      state.finished = true;\n      stream.emit('finish');\n    }\n  }\n  return need;\n}\n\nfunction endWritable(stream, state, cb) {\n  state.ending = true;\n  finishMaybe(stream, state);\n  if (cb) {\n    if (state.finished) pna.nextTick(cb);else stream.once('finish', cb);\n  }\n  state.ended = true;\n  stream.writable = false;\n}\n\nfunction onCorkedFinish(corkReq, state, err) {\n  var entry = corkReq.entry;\n  corkReq.entry = null;\n  while (entry) {\n    var cb = entry.callback;\n    state.pendingcb--;\n    cb(err);\n    entry = entry.next;\n  }\n  if (state.corkedRequestsFree) {\n    state.corkedRequestsFree.next = corkReq;\n  } else {\n    state.corkedRequestsFree = corkReq;\n  }\n}\n\nObject.defineProperty(Writable.prototype, 'destroyed', {\n  get: function () {\n    if (this._writableState === undefined) {\n      return false;\n    }\n    return this._writableState.destroyed;\n  },\n  set: function (value) {\n    // we ignore the value if the stream\n    // has not been initialized yet\n    if (!this._writableState) {\n      return;\n    }\n\n    // backward compatibility, the user is explicitly\n    // managing destroyed\n    this._writableState.destroyed = value;\n  }\n});\n\nWritable.prototype.destroy = destroyImpl.destroy;\nWritable.prototype._undestroy = destroyImpl.undestroy;\nWritable.prototype._destroy = function (err, cb) {\n  this.end();\n  cb(err);\n};","// Copyright Joyent, Inc. and other Node contributors.\n//\n// Permission is hereby granted, free of charge, to any person obtaining a\n// copy of this software and associated documentation files (the\n// \"Software\"), to deal in the Software without restriction, including\n// without limitation the rights to use, copy, modify, merge, publish,\n// distribute, sublicense, and/or sell copies of the Software, and to permit\n// persons to whom the Software is furnished to do so, subject to the\n// following conditions:\n//\n// The above copyright notice and this permission notice shall be included\n// in all copies or substantial portions of the Software.\n//\n// THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS\n// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF\n// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN\n// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,\n// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR\n// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE\n// USE OR OTHER DEALINGS IN THE SOFTWARE.\n\n'use strict';\n\nvar stringifyPrimitive = function(v) {\n  switch (typeof v) {\n    case 'string':\n      return v;\n\n    case 'boolean':\n      return v ? 'true' : 'false';\n\n    case 'number':\n      return isFinite(v) ? v : '';\n\n    default:\n      return '';\n  }\n};\n\nmodule.exports = function(obj, sep, eq, name) {\n  sep = sep || '&';\n  eq = eq || '=';\n  if (obj === null) {\n    obj = undefined;\n  }\n\n  if (typeof obj === 'object') {\n    return map(objectKeys(obj), function(k) {\n      var ks = encodeURIComponent(stringifyPrimitive(k)) + eq;\n      if (isArray(obj[k])) {\n        return map(obj[k], function(v) {\n          return ks + encodeURIComponent(stringifyPrimitive(v));\n        }).join(sep);\n      } else {\n        return ks + encodeURIComponent(stringifyPrimitive(obj[k]));\n      }\n    }).join(sep);\n\n  }\n\n  if (!name) return '';\n  return encodeURIComponent(stringifyPrimitive(name)) + eq +\n         encodeURIComponent(stringifyPrimitive(obj));\n};\n\nvar isArray = Array.isArray || function (xs) {\n  return Object.prototype.toString.call(xs) === '[object Array]';\n};\n\nfunction map (xs, f) {\n  if (xs.map) return xs.map(f);\n  var res = [];\n  for (var i = 0; i < xs.length; i++) {\n    res.push(f(xs[i], i));\n  }\n  return res;\n}\n\nvar objectKeys = Object.keys || function (obj) {\n  var res = [];\n  for (var key in obj) {\n    if (Object.prototype.hasOwnProperty.call(obj, key)) res.push(key);\n  }\n  return res;\n};\n","exports = module.exports = require('./lib/_stream_readable.js');\nexports.Stream = exports;\nexports.Readable = exports;\nexports.Writable = require('./lib/_stream_writable.js');\nexports.Duplex = require('./lib/_stream_duplex.js');\nexports.Transform = require('./lib/_stream_transform.js');\nexports.PassThrough = require('./lib/_stream_passthrough.js');\n"],"sourceRoot":""}