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url = require(\"url\");\nvar http = require(\"http\");\nvar https = require(\"https\");\nvar assert = require(\"assert\");\nvar Writable = require(\"stream\").Writable;\nvar debug = require(\"debug\")(\"follow-redirects\");\n\n// RFC7231§4.2.1: Of the request methods defined by this specification,\n// the GET, HEAD, OPTIONS, and TRACE methods are defined to be safe.\nvar SAFE_METHODS = { GET: true, HEAD: true, OPTIONS: true, TRACE: true };\n\n// Create handlers that pass events from native requests\nvar eventHandlers = Object.create(null);\n[\"abort\", \"aborted\", \"error\", \"socket\", \"timeout\"].forEach(function (event) {\n eventHandlers[event] = function (arg) {\n this._redirectable.emit(event, arg);\n };\n});\n\n// An HTTP(S) request that can be redirected\nfunction RedirectableRequest(options, responseCallback) {\n // Initialize the request\n Writable.call(this);\n options.headers = options.headers || {};\n this._options = options;\n this._redirectCount = 0;\n this._redirects = [];\n this._requestBodyLength = 0;\n this._requestBodyBuffers = [];\n\n // Since http.request treats host as an alias of hostname,\n // but the url module interprets host as hostname plus port,\n // eliminate the host property to avoid confusion.\n if (options.host) {\n // Use hostname if set, because it has precedence\n if (!options.hostname) {\n options.hostname = options.host;\n }\n delete options.host;\n }\n\n // Attach a callback if passed\n if (responseCallback) {\n this.on(\"response\", responseCallback);\n }\n\n // React to responses of native requests\n var self = this;\n this._onNativeResponse = function (response) {\n self._processResponse(response);\n };\n\n // Complete the URL object when necessary\n if (!options.pathname && options.path) {\n var searchPos = options.path.indexOf(\"?\");\n if (searchPos < 0) {\n options.pathname = options.path;\n }\n else {\n options.pathname = options.path.substring(0, searchPos);\n options.search = options.path.substring(searchPos);\n }\n }\n\n // Perform the first request\n this._performRequest();\n}\nRedirectableRequest.prototype = Object.create(Writable.prototype);\n\n// Writes buffered data to the current native request\nRedirectableRequest.prototype.write = function (data, encoding, callback) {\n // Validate input and shift parameters if necessary\n if (!(typeof data === \"string\" || typeof data === \"object\" && (\"length\" in data))) {\n throw new Error(\"data should be a string, Buffer or Uint8Array\");\n }\n if (typeof encoding === \"function\") {\n callback = encoding;\n encoding = null;\n }\n\n // Ignore empty buffers, since writing them doesn't invoke the callback\n // https://github.com/nodejs/node/issues/22066\n if (data.length === 0) {\n if (callback) {\n callback();\n }\n return;\n }\n // Only write when we don't exceed the maximum body length\n if (this._requestBodyLength + data.length <= this._options.maxBodyLength) {\n this._requestBodyLength += data.length;\n this._requestBodyBuffers.push({ data: data, encoding: encoding });\n this._currentRequest.write(data, encoding, callback);\n }\n // Error when we exceed the maximum body length\n else {\n this.emit(\"error\", new Error(\"Request body larger than maxBodyLength limit\"));\n this.abort();\n }\n};\n\n// Ends the current native request\nRedirectableRequest.prototype.end = function (data, encoding, callback) {\n // Shift parameters if necessary\n if (typeof data === \"function\") {\n callback = data;\n data = encoding = null;\n }\n else if (typeof encoding === \"function\") {\n callback = encoding;\n encoding = null;\n }\n\n // Write data and end\n var currentRequest = this._currentRequest;\n this.write(data || \"\", encoding, function () {\n currentRequest.end(null, null, callback);\n });\n};\n\n// Sets a header value on the current native request\nRedirectableRequest.prototype.setHeader = function (name, value) {\n this._options.headers[name] = value;\n this._currentRequest.setHeader(name, value);\n};\n\n// Clears a header value on the current native request\nRedirectableRequest.prototype.removeHeader = function (name) {\n delete this._options.headers[name];\n this._currentRequest.removeHeader(name);\n};\n\n// Proxy all other public ClientRequest methods\n[\n \"abort\", \"flushHeaders\", \"getHeader\",\n \"setNoDelay\", \"setSocketKeepAlive\", \"setTimeout\",\n].forEach(function (method) {\n RedirectableRequest.prototype[method] = function (a, b) {\n return this._currentRequest[method](a, b);\n };\n});\n\n// Proxy all public ClientRequest properties\n[\"aborted\", \"connection\", \"socket\"].forEach(function (property) {\n Object.defineProperty(RedirectableRequest.prototype, property, {\n get: function () { return this._currentRequest[property]; },\n });\n});\n\n// Executes the next native request (initial or redirect)\nRedirectableRequest.prototype._performRequest = function () {\n // Load the native protocol\n var protocol = this._options.protocol;\n var nativeProtocol = this._options.nativeProtocols[protocol];\n if (!nativeProtocol) {\n this.emit(\"error\", new Error(\"Unsupported protocol \" + protocol));\n return;\n }\n\n // If specified, use the agent corresponding to the protocol\n // (HTTP and HTTPS use different types of agents)\n if (this._options.agents) {\n var scheme = protocol.substr(0, protocol.length - 1);\n this._options.agent = this._options.agents[scheme];\n }\n\n // Create the native request\n var request = this._currentRequest =\n nativeProtocol.request(this._options, this._onNativeResponse);\n this._currentUrl = url.format(this._options);\n\n // Set up event handlers\n request._redirectable = this;\n for (var event in eventHandlers) {\n /* istanbul ignore else */\n if (event) {\n request.on(event, eventHandlers[event]);\n }\n }\n\n // End a redirected request\n // (The first request must be ended explicitly with RedirectableRequest#end)\n if (this._isRedirect) {\n // Write the request entity and end.\n var i = 0;\n var buffers = this._requestBodyBuffers;\n (function writeNext() {\n if (i < buffers.length) {\n var buffer = buffers[i++];\n request.write(buffer.data, buffer.encoding, writeNext);\n }\n else {\n request.end();\n }\n }());\n }\n};\n\n// Processes a response from the current native request\nRedirectableRequest.prototype._processResponse = function (response) {\n // Store the redirected response\n if (this._options.trackRedirects) {\n this._redirects.push({\n url: this._currentUrl,\n headers: response.headers,\n statusCode: response.statusCode,\n });\n }\n\n // RFC7231§6.4: The 3xx (Redirection) class of status code indicates\n // that further action needs to be taken by the user agent in order to\n // fulfill the request. If a Location header field is provided,\n // the user agent MAY automatically redirect its request to the URI\n // referenced by the Location field value,\n // even if the specific status code is not understood.\n var location = response.headers.location;\n if (location && this._options.followRedirects !== false &&\n response.statusCode >= 300 && response.statusCode < 400) {\n // RFC7231§6.4: A client SHOULD detect and intervene\n // in cyclical redirections (i.e., \"infinite\" redirection loops).\n if (++this._redirectCount > this._options.maxRedirects) {\n this.emit(\"error\", new Error(\"Max redirects exceeded.\"));\n return;\n }\n\n // RFC7231§6.4: Automatic redirection needs to done with\n // care for methods not known to be safe […],\n // since the user might not wish to redirect an unsafe request.\n // RFC7231§6.4.7: The 307 (Temporary Redirect) status code indicates\n // that the target resource resides temporarily under a different URI\n // and the user agent MUST NOT change the request method\n // if it performs an automatic redirection to that URI.\n var header;\n var headers = this._options.headers;\n if (response.statusCode !== 307 && !(this._options.method in SAFE_METHODS)) {\n this._options.method = \"GET\";\n // Drop a possible entity and headers related to it\n this._requestBodyBuffers = [];\n for (header in headers) {\n if (/^content-/i.test(header)) {\n delete headers[header];\n }\n }\n }\n\n // Drop the Host header, as the redirect might lead to a different host\n if (!this._isRedirect) {\n for (header in headers) {\n if (/^host$/i.test(header)) {\n delete headers[header];\n }\n }\n }\n\n // Perform the redirected request\n var redirectUrl = url.resolve(this._currentUrl, location);\n debug(\"redirecting to\", redirectUrl);\n Object.assign(this._options, url.parse(redirectUrl));\n this._isRedirect = true;\n this._performRequest();\n\n // Discard the remainder of the response to avoid waiting for data\n response.destroy();\n }\n else {\n // The response is not a redirect; return it as-is\n response.responseUrl = this._currentUrl;\n response.redirects = this._redirects;\n this.emit(\"response\", response);\n\n // Clean up\n this._requestBodyBuffers = [];\n }\n};\n\n// Wraps the key/value object of protocols with redirect functionality\nfunction wrap(protocols) {\n // Default settings\n var exports = {\n maxRedirects: 21,\n maxBodyLength: 10 * 1024 * 1024,\n };\n\n // Wrap each protocol\n var nativeProtocols = {};\n Object.keys(protocols).forEach(function (scheme) {\n var protocol = scheme + \":\";\n var nativeProtocol = nativeProtocols[protocol] = protocols[scheme];\n var wrappedProtocol = exports[scheme] = Object.create(nativeProtocol);\n\n // Executes a request, following redirects\n wrappedProtocol.request = function (options, callback) {\n if (typeof options === \"string\") {\n options = url.parse(options);\n options.maxRedirects = exports.maxRedirects;\n }\n else {\n options = Object.assign({\n protocol: protocol,\n maxRedirects: exports.maxRedirects,\n maxBodyLength: exports.maxBodyLength,\n }, options);\n }\n options.nativeProtocols = nativeProtocols;\n assert.equal(options.protocol, protocol, \"protocol mismatch\");\n debug(\"options\", options);\n return new RedirectableRequest(options, callback);\n };\n\n // Executes a GET request, following redirects\n wrappedProtocol.get = function (options, callback) {\n var request = wrappedProtocol.request(options, callback);\n request.end();\n return request;\n };\n });\n return exports;\n}\n\n// Exports\nmodule.exports = wrap({ http: http, https: https });\nmodule.exports.wrap = wrap;\n","module.exports = require(\"./\").http;\n","module.exports = require(\"./\").https;\n"]}
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