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url = require(\"url\");\nvar URL = url.URL;\nvar http = require(\"http\");\nvar https = require(\"https\");\nvar Writable = require(\"stream\").Writable;\nvar assert = require(\"assert\");\nvar debug = require(\"./debug\");\n\n// Create handlers that pass events from native requests\nvar events = [\"abort\", \"aborted\", \"connect\", \"error\", \"socket\", \"timeout\"];\nvar eventHandlers = Object.create(null);\nevents.forEach(function (event) {\n eventHandlers[event] = function (arg1, arg2, arg3) {\n this._redirectable.emit(event, arg1, arg2, arg3);\n };\n});\n\n// Error types with codes\nvar RedirectionError = createErrorType(\n \"ERR_FR_REDIRECTION_FAILURE\",\n \"Redirected request failed\"\n);\nvar TooManyRedirectsError = createErrorType(\n \"ERR_FR_TOO_MANY_REDIRECTS\",\n \"Maximum number of redirects exceeded\"\n);\nvar MaxBodyLengthExceededError = createErrorType(\n \"ERR_FR_MAX_BODY_LENGTH_EXCEEDED\",\n \"Request body larger than maxBodyLength limit\"\n);\nvar WriteAfterEndError = createErrorType(\n \"ERR_STREAM_WRITE_AFTER_END\",\n \"write after end\"\n);\n\n// An HTTP(S) request that can be redirected\nfunction RedirectableRequest(options, responseCallback) {\n // Initialize the request\n Writable.call(this);\n this._sanitizeOptions(options);\n this._options = options;\n this._ended = false;\n this._ending = false;\n this._redirectCount = 0;\n this._redirects = [];\n this._requestBodyLength = 0;\n this._requestBodyBuffers = [];\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 // Perform the first request\n this._performRequest();\n}\nRedirectableRequest.prototype = Object.create(Writable.prototype);\n\nRedirectableRequest.prototype.abort = function () {\n abortRequest(this._currentRequest);\n this.emit(\"abort\");\n};\n\n// Writes buffered data to the current native request\nRedirectableRequest.prototype.write = function (data, encoding, callback) {\n // Writing is not allowed if end has been called\n if (this._ending) {\n throw new WriteAfterEndError();\n }\n\n // Validate input and shift parameters if necessary\n if (!(typeof data === \"string\" || typeof data === \"object\" && (\"length\" in data))) {\n throw new TypeError(\"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 MaxBodyLengthExceededError());\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 if needed and end\n if (!data) {\n this._ended = this._ending = true;\n this._currentRequest.end(null, null, callback);\n }\n else {\n var self = this;\n var currentRequest = this._currentRequest;\n this.write(data, encoding, function () {\n self._ended = true;\n currentRequest.end(null, null, callback);\n });\n this._ending = true;\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// Global timeout for all underlying requests\nRedirectableRequest.prototype.setTimeout = function (msecs, callback) {\n var self = this;\n\n // Destroys the socket on timeout\n function destroyOnTimeout(socket) {\n socket.setTimeout(msecs);\n socket.removeListener(\"timeout\", socket.destroy);\n socket.addListener(\"timeout\", socket.destroy);\n }\n\n // Sets up a timer to trigger a timeout event\n function startTimer(socket) {\n if (self._timeout) {\n clearTimeout(self._timeout);\n }\n self._timeout = setTimeout(function () {\n self.emit(\"timeout\");\n clearTimer();\n }, msecs);\n destroyOnTimeout(socket);\n }\n\n // Stops a timeout from triggering\n function clearTimer() {\n // Clear the timeout\n if (self._timeout) {\n clearTimeout(self._timeout);\n self._timeout = null;\n }\n\n // Clean up all attached listeners\n self.removeListener(\"abort\", clearTimer);\n self.removeListener(\"error\", clearTimer);\n self.removeListener(\"response\", clearTimer);\n if (callback) {\n self.removeListener(\"timeout\", callback);\n }\n if (!self.socket) {\n self._currentRequest.removeListener(\"socket\", startTimer);\n }\n }\n\n // Attach callback if passed\n if (callback) {\n this.on(\"timeout\", callback);\n }\n\n // Start the timer if or when the socket is opened\n if (this.socket) {\n startTimer(this.socket);\n }\n else {\n this._currentRequest.once(\"socket\", startTimer);\n }\n\n // Clean up on events\n this.on(\"socket\", destroyOnTimeout);\n this.on(\"abort\", clearTimer);\n this.on(\"error\", clearTimer);\n this.on(\"response\", clearTimer);\n\n return this;\n};\n\n// Proxy all other public ClientRequest methods\n[\n \"flushHeaders\", \"getHeader\",\n \"setNoDelay\", \"setSocketKeepAlive\",\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\nRedirectableRequest.prototype._sanitizeOptions = function (options) {\n // Ensure headers are always present\n if (!options.headers) {\n options.headers = {};\n }\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 // 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\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 TypeError(\"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.slice(0, -1);\n this._options.agent = this._options.agents[scheme];\n }\n\n // Create the native request and set up its event handlers\n var request = this._currentRequest =\n nativeProtocol.request(this._options, this._onNativeResponse);\n request._redirectable = this;\n for (var event of events) {\n request.on(event, eventHandlers[event]);\n }\n\n // RFC7230§5.3.1: When making a request directly to an origin server, […]\n // a client MUST send only the absolute path […] as the request-target.\n this._currentUrl = /^\\//.test(this._options.path) ?\n url.format(this._options) :\n // When making a request to a proxy, […]\n // a client MUST send the target URI in absolute-form […].\n this._currentUrl = this._options.path;\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 self = this;\n var buffers = this._requestBodyBuffers;\n (function writeNext(error) {\n // Only write if this request has not been redirected yet\n /* istanbul ignore else */\n if (request === self._currentRequest) {\n // Report any write errors\n /* istanbul ignore if */\n if (error) {\n self.emit(\"error\", error);\n }\n // Write the next buffer if there are still left\n else if (i < buffers.length) {\n var buffer = buffers[i++];\n /* istanbul ignore else */\n if (!request.finished) {\n request.write(buffer.data, buffer.encoding, writeNext);\n }\n }\n // End the request if `end` has been called on us\n else if (self._ended) {\n request.end();\n }\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 var statusCode = response.statusCode;\n if (this._options.trackRedirects) {\n this._redirects.push({\n url: this._currentUrl,\n headers: response.headers,\n statusCode: 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\n // If the response is not a redirect; return it as-is\n var location = response.headers.location;\n if (!location || this._options.followRedirects === false ||\n statusCode < 300 || statusCode >= 400) {\n response.responseUrl = this._currentUrl;\n response.redirects = this._redirects;\n this.emit(\"response\", response);\n\n // Clean up\n this._requestBodyBuffers = [];\n return;\n }\n\n // The response is a redirect, so abort the current request\n abortRequest(this._currentRequest);\n // Discard the remainder of the response to avoid waiting for data\n response.destroy();\n\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 TooManyRedirectsError());\n return;\n }\n\n // Store the request headers if applicable\n var requestHeaders;\n var beforeRedirect = this._options.beforeRedirect;\n if (beforeRedirect) {\n requestHeaders = Object.assign({\n // The Host header was set by nativeProtocol.request\n Host: response.req.getHeader(\"host\"),\n }, this._options.headers);\n }\n\n // RFC7231§6.4: Automatic redirection needs to done with\n // care for methods not known to be safe, […]\n // RFC7231§6.4.2–3: For historical reasons, a user agent MAY change\n // the request method from POST to GET for the subsequent request.\n var method = this._options.method;\n if ((statusCode === 301 || statusCode === 302) && this._options.method === \"POST\" ||\n // RFC7231§6.4.4: The 303 (See Other) status code indicates that\n // the server is redirecting the user agent to a different resource […]\n // A user agent can perform a retrieval request targeting that URI\n // (a GET or HEAD request if using HTTP) […]\n (statusCode === 303) && !/^(?:GET|HEAD)$/.test(this._options.method)) {\n this._options.method = \"GET\";\n // Drop a possible entity and headers related to it\n this._requestBodyBuffers = [];\n removeMatchingHeaders(/^content-/i, this._options.headers);\n }\n\n // Drop the Host header, as the redirect might lead to a different host\n var currentHostHeader = removeMatchingHeaders(/^host$/i, this._options.headers);\n\n // If the redirect is relative, carry over the host of the last request\n var currentUrlParts = url.parse(this._currentUrl);\n var currentHost = currentHostHeader || currentUrlParts.host;\n var currentUrl = /^\\w+:/.test(location) ? this._currentUrl :\n url.format(Object.assign(currentUrlParts, { host: currentHost }));\n\n // Determine the URL of the redirection\n var redirectUrl;\n try {\n redirectUrl = url.resolve(currentUrl, location);\n }\n catch (cause) {\n this.emit(\"error\", new RedirectionError(cause));\n return;\n }\n\n // Create the redirected request\n debug(\"redirecting to\", redirectUrl);\n this._isRedirect = true;\n var redirectUrlParts = url.parse(redirectUrl);\n Object.assign(this._options, redirectUrlParts);\n\n // Drop confidential headers when redirecting to a less secure protocol\n // or to a different domain that is not a superdomain\n if (redirectUrlParts.protocol !== currentUrlParts.protocol &&\n redirectUrlParts.protocol !== \"https:\" ||\n redirectUrlParts.host !== currentHost &&\n !isSubdomain(redirectUrlParts.host, currentHost)) {\n removeMatchingHeaders(/^(?:authorization|cookie)$/i, this._options.headers);\n }\n\n // Evaluate the beforeRedirect callback\n if (typeof beforeRedirect === \"function\") {\n var responseDetails = {\n headers: response.headers,\n statusCode: statusCode,\n };\n var requestDetails = {\n url: currentUrl,\n method: method,\n headers: requestHeaders,\n };\n try {\n beforeRedirect(this._options, responseDetails, requestDetails);\n }\n catch (err) {\n this.emit(\"error\", err);\n return;\n }\n this._sanitizeOptions(this._options);\n }\n\n // Perform the redirected request\n try {\n this._performRequest();\n }\n catch (cause) {\n this.emit(\"error\", new RedirectionError(cause));\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 function request(input, options, callback) {\n // Parse parameters\n if (typeof input === \"string\") {\n var urlStr = input;\n try {\n input = urlToOptions(new URL(urlStr));\n }\n catch (err) {\n /* istanbul ignore next */\n input = url.parse(urlStr);\n }\n }\n else if (URL && (input instanceof URL)) {\n input = urlToOptions(input);\n }\n else {\n callback = options;\n options = input;\n input = { protocol: protocol };\n }\n if (typeof options === \"function\") {\n callback = options;\n options = null;\n }\n\n // Set defaults\n options = Object.assign({\n maxRedirects: exports.maxRedirects,\n maxBodyLength: exports.maxBodyLength,\n }, input, options);\n options.nativeProtocols = nativeProtocols;\n\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 function get(input, options, callback) {\n var wrappedRequest = wrappedProtocol.request(input, options, callback);\n wrappedRequest.end();\n return wrappedRequest;\n }\n\n // Expose the properties on the wrapped protocol\n Object.defineProperties(wrappedProtocol, {\n request: { value: request, configurable: true, enumerable: true, writable: true },\n get: { value: get, configurable: true, enumerable: true, writable: true },\n });\n });\n return exports;\n}\n\n/* istanbul ignore next */\nfunction noop() { /* empty */ }\n\n// from https://github.com/nodejs/node/blob/master/lib/internal/url.js\nfunction urlToOptions(urlObject) {\n var options = {\n protocol: urlObject.protocol,\n hostname: urlObject.hostname.startsWith(\"[\") ?\n /* istanbul ignore next */\n urlObject.hostname.slice(1, -1) :\n urlObject.hostname,\n hash: urlObject.hash,\n search: urlObject.search,\n pathname: urlObject.pathname,\n path: urlObject.pathname + urlObject.search,\n href: urlObject.href,\n };\n if (urlObject.port !== \"\") {\n options.port = Number(urlObject.port);\n }\n return options;\n}\n\nfunction removeMatchingHeaders(regex, headers) {\n var lastValue;\n for (var header in headers) {\n if (regex.test(header)) {\n lastValue = headers[header];\n delete headers[header];\n }\n }\n return (lastValue === null || typeof lastValue === \"undefined\") ?\n undefined : String(lastValue).trim();\n}\n\nfunction createErrorType(code, defaultMessage) {\n function CustomError(cause) {\n Error.captureStackTrace(this, this.constructor);\n if (!cause) {\n this.message = defaultMessage;\n }\n else {\n this.message = defaultMessage + \": \" + cause.message;\n this.cause = cause;\n }\n }\n CustomError.prototype = new Error();\n CustomError.prototype.constructor = CustomError;\n CustomError.prototype.name = \"Error [\" + code + \"]\";\n CustomError.prototype.code = code;\n return CustomError;\n}\n\nfunction abortRequest(request) {\n for (var event of events) {\n request.removeListener(event, eventHandlers[event]);\n }\n request.on(\"error\", noop);\n request.abort();\n}\n\nfunction isSubdomain(subdomain, domain) {\n const dot = subdomain.length - domain.length - 1;\n return dot > 0 && subdomain[dot] === \".\" && subdomain.endsWith(domain);\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","var debug;\n\nmodule.exports = function () {\n if (!debug) {\n try {\n /* eslint global-require: off */\n debug = require(\"debug\")(\"follow-redirects\");\n }\n catch (error) { /* */ }\n if (typeof debug !== \"function\") {\n debug = function () { /* */ };\n }\n }\n debug.apply(null, arguments);\n};\n"]}
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