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_               = require('lodash');\nconst assert          = require('assert');\nconst Bluebird        = require('bluebird');\nconst Fetch           = require('./fetch');\nconst File            = require('fs');\nconst { Headers }     = require('./fetch');\nconst { isArray }     = require('util');\nconst Path            = require('path');\nconst Request         = require('request');\nconst resourceLoader  = require('jsdom/lib/jsdom/browser/resource-loader');\nconst URL             = require('url');\nconst Utils           = require('jsdom/lib/jsdom/utils');\n\n\n// Pipeline is sequence of request/response handlers that are used to prepare a\n// request, make the request, and process the response.\nclass Pipeline extends Array {\n\n  constructor(browser) {\n    super();\n    this._browser = browser;\n    for (let handler of Pipeline._default)\n      this.push(handler);\n  }\n\n  _fetch(input, init) {\n    const request   = new Fetch.Request(input, init);\n    const browser   = this._browser;\n    browser.emit('request', request);\n\n    return this\n      ._runPipeline(request)\n      .then(function(response) {\n        response.time     = Date.now();\n        response.request  = request;\n        browser.emit('response', request, response);\n        return response;\n      })\n      .catch(function(error) {\n        browser._debug('Resource error', error.stack);\n        throw new TypeError(error.message);\n      });\n  }\n\n  _runPipeline(request) {\n    return this\n      ._getOriginalResponse(request)\n      .then((response)=> {\n        return this._prepareResponse(request, response);\n      });\n  }\n\n  _getOriginalResponse(request) {\n    const browser         = this._browser;\n    const requestHandlers = this.getRequestHandlers().concat(Pipeline.makeHTTPRequest);\n\n    return Bluebird.reduce(requestHandlers, function(lastResponse, requestHandler) {\n        return lastResponse || requestHandler(browser, request);\n      }, null)\n      .then(function(response) {\n        assert(response && response.hasOwnProperty('statusText'), 'Request handler must return a response');\n        return response;\n      });\n  }\n\n  _prepareResponse(request, originalResponse) {\n    const browser           = this._browser;\n    const responseHandlers  = this.getResponseHandlers();\n\n    return Bluebird.reduce(responseHandlers, function(lastResponse, responseHandler) {\n        return responseHandler(browser, request, lastResponse);\n      }, originalResponse)\n      .then(function(response) {\n        assert(response && response.hasOwnProperty('statusText'), 'Response handler must return a response');\n        return response;\n      });\n  }\n\n\n  // -- Handlers --\n\n  // Add a request or response handler.  This handler will only be used by this\n  // pipeline instance (browser).\n  addHandler(handler) {\n    assert(handler.call, 'Handler must be a function');\n    assert(handler.length === 2 || handler.length === 3, 'Handler function takes 2 (request handler) or 3 (reponse handler) arguments');\n    this.push(handler);\n  }\n\n  // Remove a request or response handler.\n  removeHandler(handler) {\n    assert(handler.call, 'Handler must be a function');\n    var index = this.indexOf(handler);\n    if (index > -1) {\n      this.splice(index,1);\n    }\n  }\n\n  // Add a request or response handler.  This handler will be used by any new\n  // pipeline instance (browser).\n  static addHandler(handler) {\n    assert(handler.call, 'Handler must be a function');\n    assert(handler.length === 2 || handler.length === 3, 'Handler function takes 2 (request handler) or 3 (response handler) arguments');\n    this._default.push(handler);\n  }\n  \n  // Remove a request or response handler.\n  static removeHandler(handler) {\n    assert(handler.call, 'Handler must be a function');\n    var index = this._default.indexOf(handler);\n    if (index > -1) {\n      this._default.splice(index,1);\n    }\n  }\n\n  // Get array of request handlers\n  getRequestHandlers() {\n    // N.B. inheriting from an Array is slightly broken, so just iterate manually\n    const result = [];\n    for (let i = 0; i < this.length; i++)\n      if (this[i].length === 2)\n        result.push(this[i]);\n    return result;\n  }\n\n  // Get array of request handlers\n  getResponseHandlers() {\n    // N.B. inheriting from an Array is slightly broken, so just iterate manually\n    const result = [];\n    for (let i = 0; i < this.length; i++)\n      if (this[i].length === 3)\n        result.push(this[i]);\n    return result;\n  }\n\n\n  // -- Prepare request --\n\n  // This handler normalizes the request URL.\n  //\n  // It turns relative URLs into absolute URLs based on the current document URL\n  // or base element, or if no document open, based on browser.site property.\n  static normalizeURL(browser, request) {\n    if (browser.document)\n    // Resolve URL relative to document URL/base, or for new browser, using\n    // Browser.site\n      request.url = resourceLoader.resolveResourceUrl(browser.document, request.url);\n    else\n      request.url = Utils.resolveHref(browser.site || 'http://localhost', request.url);\n  }\n\n\n  // This handler mergers request headers.\n  //\n  // It combines headers provided in the request with custom headers defined by\n  // the browser (user agent, authentication, etc).\n  //\n  // It also normalizes all headers by down-casing the header names.\n  static mergeHeaders(browser, request) {\n    if (browser.headers)\n      _.each(browser.headers, (value, name)=> {\n        request.headers.append(name, browser.headers[name]);\n      });\n    if (!request.headers.has('User-Agent'))\n      request.headers.set('User-Agent', browser.userAgent);\n\n    // Always pass Host: from request URL\n    const { host } = URL.parse(request.url);\n    request.headers.set('Host', host);\n\n    // HTTP Basic authentication\n    const authenticate = { host, username: null, password: null };\n    browser.emit('authenticate', authenticate);\n    const { username, password } = authenticate;\n    if (username && password) {\n      browser.log(`Authenticating as ${username}:${password}`);\n      const base64 = new Buffer(`${username}:${password}`).toString('base64');\n      request.headers.set('authorization',  `Basic ${base64}`);\n    }\n  }\n\n\n  // -- Retrieve actual resource --\n\n  // Used to perform HTTP request (also supports file: resources).  This is always\n  // the last request handler.\n  static makeHTTPRequest(browser, request) {\n    const { url } = request;\n    const { protocol, hostname, pathname } = URL.parse(url);\n\n    if (protocol === 'file:') {\n\n      // If the request is for a file:// descriptor, just open directly from the\n      // file system rather than getting node's http (which handles file://\n      // poorly) involved.\n      if (request.method !== 'GET')\n        return new Fetch.Response('', { url, status: 405 });\n\n      const filename = Path.normalize(decodeURI(pathname));\n      const exists   = File.existsSync(filename);\n      if (exists) {\n        const stream = File.createReadStream(filename);\n        return new Fetch.Response(stream, { url, status: 200 });\n      } else\n        return new Fetch.Response('', { url, status: 404 });\n\n    }\n\n    // We're going to use cookies later when receiving response.\n    const { cookies }   = browser;\n    const cookieHeader  = cookies.serialize(hostname, pathname);\n    if (cookieHeader)\n      request.headers.append('Cookie', cookieHeader);\n\n    const consumeBody = /^POST|PUT/.test(request.method) && request._consume() || Promise.resolve(null);\n    return consumeBody\n      .then(function(body) {\n\n        const httpRequest = new Request({\n          method:         request.method,\n          uri:            request.url,\n          headers:        request.headers.toObject(),\n          proxy:          browser.proxy,\n          body,\n          jar:            false,\n          followRedirect: false,\n          strictSSL:      browser.strictSSL,\n          localAddress:   browser.localAddress || 0\n        });\n\n        return new Promise(function(resolve, reject) {\n          httpRequest\n            .on('response', (response)=> {\n              // Request returns an object where property name is header name,\n              // property value is either header value, or an array if header sent\n              // multiple times (e.g. `Set-Cookie`).\n              const arrayOfHeaders = _.reduce(response.headers, (headers, value, name)=> {\n                if (isArray(value))\n                  for (let item of value)\n                    headers.push([name, item]);\n                else\n                  headers.push([name, value]);\n                return headers;\n              }, []);\n\n              resolve(new Fetch.Response(response, {\n                url:        request.url,\n                status:     response.statusCode,\n                headers:    new Headers(arrayOfHeaders)\n              }));\n            })\n            .on('error', reject);\n        });\n\n      });\n  }\n\n\n  // -- Handle response --\n\n  static handleHeaders(browser, request, response) {\n    response.headers = new Headers(response.headers);\n    return response;\n  }\n\n  static handleCookies(browser, request, response) {\n    // Set cookies from response: call update() with array of headers\n    const { hostname, pathname } = URL.parse(request.url);\n    const newCookies = response.headers.getAll('Set-Cookie');\n    browser.cookies.update(newCookies, hostname, pathname);\n    return response;\n  }\n\n  static handleRedirect(browser, request, response) {\n    const { status }  = response;\n    if (status === 301 || status === 302 || status === 303 || status === 307 || status === 308) {\n      if (request.redirect === 'error')\n        return Fetch.Response.error();\n\n      const location = response.headers.get('Location');\n      if (location === null)\n        return response;\n\n      if (request._redirectCount >= 20)\n        return Fetch.Response.error();\n\n      browser.emit('redirect', request, response, location);\n      ++request._redirectCount;\n      if (status !== 307) {\n        request.method = 'GET';\n        request.headers.delete('Content-Type');\n        request.headers.delete('Content-Length');\n        request.headers.delete('Content-Transfer-Encoding');\n      }\n\n      // This request is referer for next\n      request.headers.set('Referer', request.url);\n      request.url = Utils.resolveHref(request.url, location);\n      return browser.pipeline._runPipeline(request);\n    } else\n      return response;\n  }\n\n}\n\n\n// The default pipeline.  All new pipelines are instantiated with this set of\n// handlers.\nPipeline._default = [\n  Pipeline.normalizeURL,\n  Pipeline.mergeHeaders,\n  Pipeline.handleHeaders,\n  Pipeline.handleCookies,\n  Pipeline.handleRedirect\n];\n\nmodule.exports = Pipeline;\n\n"]}