[6a3a178] | 1 | var url = require("url");
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| 2 | var URL = url.URL;
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| 3 | var http = require("http");
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| 4 | var https = require("https");
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| 5 | var Writable = require("stream").Writable;
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| 6 | var assert = require("assert");
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| 7 | var debug = require("./debug");
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| 8 |
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| 9 | // Create handlers that pass events from native requests
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| 10 | var events = ["abort", "aborted", "connect", "error", "socket", "timeout"];
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| 11 | var eventHandlers = Object.create(null);
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| 12 | events.forEach(function (event) {
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| 13 | eventHandlers[event] = function (arg1, arg2, arg3) {
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| 14 | this._redirectable.emit(event, arg1, arg2, arg3);
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| 15 | };
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| 16 | });
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| 17 |
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| 18 | // Error types with codes
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| 19 | var RedirectionError = createErrorType(
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| 20 | "ERR_FR_REDIRECTION_FAILURE",
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[e29cc2e] | 21 | "Redirected request failed"
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[6a3a178] | 22 | );
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| 23 | var TooManyRedirectsError = createErrorType(
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| 24 | "ERR_FR_TOO_MANY_REDIRECTS",
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| 25 | "Maximum number of redirects exceeded"
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| 26 | );
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| 27 | var MaxBodyLengthExceededError = createErrorType(
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| 28 | "ERR_FR_MAX_BODY_LENGTH_EXCEEDED",
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| 29 | "Request body larger than maxBodyLength limit"
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| 30 | );
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| 31 | var WriteAfterEndError = createErrorType(
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| 32 | "ERR_STREAM_WRITE_AFTER_END",
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| 33 | "write after end"
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| 34 | );
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| 35 |
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| 36 | // An HTTP(S) request that can be redirected
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| 37 | function RedirectableRequest(options, responseCallback) {
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| 38 | // Initialize the request
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| 39 | Writable.call(this);
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| 40 | this._sanitizeOptions(options);
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| 41 | this._options = options;
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| 42 | this._ended = false;
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| 43 | this._ending = false;
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| 44 | this._redirectCount = 0;
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| 45 | this._redirects = [];
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| 46 | this._requestBodyLength = 0;
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| 47 | this._requestBodyBuffers = [];
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| 48 |
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| 49 | // Attach a callback if passed
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| 50 | if (responseCallback) {
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| 51 | this.on("response", responseCallback);
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| 52 | }
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| 53 |
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| 54 | // React to responses of native requests
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| 55 | var self = this;
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| 56 | this._onNativeResponse = function (response) {
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| 57 | self._processResponse(response);
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| 58 | };
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| 59 |
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| 60 | // Perform the first request
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| 61 | this._performRequest();
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| 62 | }
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| 63 | RedirectableRequest.prototype = Object.create(Writable.prototype);
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| 64 |
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| 65 | RedirectableRequest.prototype.abort = function () {
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| 66 | abortRequest(this._currentRequest);
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| 67 | this.emit("abort");
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| 68 | };
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| 69 |
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| 70 | // Writes buffered data to the current native request
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| 71 | RedirectableRequest.prototype.write = function (data, encoding, callback) {
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| 72 | // Writing is not allowed if end has been called
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| 73 | if (this._ending) {
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| 74 | throw new WriteAfterEndError();
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| 75 | }
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| 76 |
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| 77 | // Validate input and shift parameters if necessary
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| 78 | if (!(typeof data === "string" || typeof data === "object" && ("length" in data))) {
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| 79 | throw new TypeError("data should be a string, Buffer or Uint8Array");
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| 80 | }
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| 81 | if (typeof encoding === "function") {
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| 82 | callback = encoding;
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| 83 | encoding = null;
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| 84 | }
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| 85 |
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| 86 | // Ignore empty buffers, since writing them doesn't invoke the callback
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| 87 | // https://github.com/nodejs/node/issues/22066
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| 88 | if (data.length === 0) {
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| 89 | if (callback) {
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| 90 | callback();
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| 91 | }
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| 92 | return;
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| 93 | }
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| 94 | // Only write when we don't exceed the maximum body length
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| 95 | if (this._requestBodyLength + data.length <= this._options.maxBodyLength) {
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| 96 | this._requestBodyLength += data.length;
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| 97 | this._requestBodyBuffers.push({ data: data, encoding: encoding });
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| 98 | this._currentRequest.write(data, encoding, callback);
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| 99 | }
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| 100 | // Error when we exceed the maximum body length
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| 101 | else {
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| 102 | this.emit("error", new MaxBodyLengthExceededError());
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| 103 | this.abort();
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| 104 | }
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| 105 | };
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| 106 |
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| 107 | // Ends the current native request
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| 108 | RedirectableRequest.prototype.end = function (data, encoding, callback) {
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| 109 | // Shift parameters if necessary
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| 110 | if (typeof data === "function") {
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| 111 | callback = data;
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| 112 | data = encoding = null;
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| 113 | }
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| 114 | else if (typeof encoding === "function") {
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| 115 | callback = encoding;
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| 116 | encoding = null;
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| 117 | }
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| 118 |
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| 119 | // Write data if needed and end
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| 120 | if (!data) {
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| 121 | this._ended = this._ending = true;
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| 122 | this._currentRequest.end(null, null, callback);
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| 123 | }
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| 124 | else {
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| 125 | var self = this;
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| 126 | var currentRequest = this._currentRequest;
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| 127 | this.write(data, encoding, function () {
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| 128 | self._ended = true;
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| 129 | currentRequest.end(null, null, callback);
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| 130 | });
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| 131 | this._ending = true;
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| 132 | }
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| 133 | };
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| 134 |
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| 135 | // Sets a header value on the current native request
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| 136 | RedirectableRequest.prototype.setHeader = function (name, value) {
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| 137 | this._options.headers[name] = value;
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| 138 | this._currentRequest.setHeader(name, value);
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| 139 | };
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| 140 |
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| 141 | // Clears a header value on the current native request
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| 142 | RedirectableRequest.prototype.removeHeader = function (name) {
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| 143 | delete this._options.headers[name];
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| 144 | this._currentRequest.removeHeader(name);
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| 145 | };
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| 146 |
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| 147 | // Global timeout for all underlying requests
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| 148 | RedirectableRequest.prototype.setTimeout = function (msecs, callback) {
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| 149 | var self = this;
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| 150 |
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| 151 | // Destroys the socket on timeout
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| 152 | function destroyOnTimeout(socket) {
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| 153 | socket.setTimeout(msecs);
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| 154 | socket.removeListener("timeout", socket.destroy);
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| 155 | socket.addListener("timeout", socket.destroy);
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| 156 | }
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| 157 |
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| 158 | // Sets up a timer to trigger a timeout event
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| 159 | function startTimer(socket) {
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| 160 | if (self._timeout) {
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| 161 | clearTimeout(self._timeout);
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| 162 | }
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| 163 | self._timeout = setTimeout(function () {
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| 164 | self.emit("timeout");
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| 165 | clearTimer();
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| 166 | }, msecs);
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| 167 | destroyOnTimeout(socket);
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| 168 | }
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| 169 |
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| 170 | // Stops a timeout from triggering
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| 171 | function clearTimer() {
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[e29cc2e] | 172 | // Clear the timeout
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[6a3a178] | 173 | if (self._timeout) {
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| 174 | clearTimeout(self._timeout);
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| 175 | self._timeout = null;
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| 176 | }
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[e29cc2e] | 177 |
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| 178 | // Clean up all attached listeners
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| 179 | self.removeListener("abort", clearTimer);
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| 180 | self.removeListener("error", clearTimer);
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| 181 | self.removeListener("response", clearTimer);
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[6a3a178] | 182 | if (callback) {
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| 183 | self.removeListener("timeout", callback);
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| 184 | }
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| 185 | if (!self.socket) {
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| 186 | self._currentRequest.removeListener("socket", startTimer);
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| 187 | }
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| 188 | }
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| 189 |
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| 190 | // Attach callback if passed
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| 191 | if (callback) {
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| 192 | this.on("timeout", callback);
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| 193 | }
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| 194 |
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| 195 | // Start the timer if or when the socket is opened
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| 196 | if (this.socket) {
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| 197 | startTimer(this.socket);
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| 198 | }
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| 199 | else {
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| 200 | this._currentRequest.once("socket", startTimer);
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| 201 | }
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| 202 |
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| 203 | // Clean up on events
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| 204 | this.on("socket", destroyOnTimeout);
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[e29cc2e] | 205 | this.on("abort", clearTimer);
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| 206 | this.on("error", clearTimer);
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| 207 | this.on("response", clearTimer);
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[6a3a178] | 208 |
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| 209 | return this;
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| 210 | };
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| 211 |
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| 212 | // Proxy all other public ClientRequest methods
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| 213 | [
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| 214 | "flushHeaders", "getHeader",
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| 215 | "setNoDelay", "setSocketKeepAlive",
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| 216 | ].forEach(function (method) {
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| 217 | RedirectableRequest.prototype[method] = function (a, b) {
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| 218 | return this._currentRequest[method](a, b);
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| 219 | };
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| 220 | });
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| 221 |
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| 222 | // Proxy all public ClientRequest properties
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| 223 | ["aborted", "connection", "socket"].forEach(function (property) {
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| 224 | Object.defineProperty(RedirectableRequest.prototype, property, {
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| 225 | get: function () { return this._currentRequest[property]; },
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| 226 | });
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| 227 | });
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| 228 |
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| 229 | RedirectableRequest.prototype._sanitizeOptions = function (options) {
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| 230 | // Ensure headers are always present
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| 231 | if (!options.headers) {
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| 232 | options.headers = {};
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| 233 | }
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| 234 |
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| 235 | // Since http.request treats host as an alias of hostname,
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| 236 | // but the url module interprets host as hostname plus port,
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| 237 | // eliminate the host property to avoid confusion.
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| 238 | if (options.host) {
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| 239 | // Use hostname if set, because it has precedence
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| 240 | if (!options.hostname) {
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| 241 | options.hostname = options.host;
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| 242 | }
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| 243 | delete options.host;
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| 244 | }
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| 245 |
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| 246 | // Complete the URL object when necessary
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| 247 | if (!options.pathname && options.path) {
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| 248 | var searchPos = options.path.indexOf("?");
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| 249 | if (searchPos < 0) {
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| 250 | options.pathname = options.path;
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| 251 | }
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| 252 | else {
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| 253 | options.pathname = options.path.substring(0, searchPos);
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| 254 | options.search = options.path.substring(searchPos);
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| 255 | }
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| 256 | }
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| 257 | };
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| 258 |
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| 259 |
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| 260 | // Executes the next native request (initial or redirect)
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| 261 | RedirectableRequest.prototype._performRequest = function () {
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| 262 | // Load the native protocol
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| 263 | var protocol = this._options.protocol;
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| 264 | var nativeProtocol = this._options.nativeProtocols[protocol];
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| 265 | if (!nativeProtocol) {
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| 266 | this.emit("error", new TypeError("Unsupported protocol " + protocol));
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| 267 | return;
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| 268 | }
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| 269 |
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| 270 | // If specified, use the agent corresponding to the protocol
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| 271 | // (HTTP and HTTPS use different types of agents)
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| 272 | if (this._options.agents) {
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| 273 | var scheme = protocol.substr(0, protocol.length - 1);
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| 274 | this._options.agent = this._options.agents[scheme];
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| 275 | }
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| 276 |
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| 277 | // Create the native request
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| 278 | var request = this._currentRequest =
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| 279 | nativeProtocol.request(this._options, this._onNativeResponse);
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| 280 | this._currentUrl = url.format(this._options);
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| 281 |
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| 282 | // Set up event handlers
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| 283 | request._redirectable = this;
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| 284 | for (var e = 0; e < events.length; e++) {
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| 285 | request.on(events[e], eventHandlers[events[e]]);
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| 286 | }
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| 287 |
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| 288 | // End a redirected request
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| 289 | // (The first request must be ended explicitly with RedirectableRequest#end)
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| 290 | if (this._isRedirect) {
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| 291 | // Write the request entity and end.
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| 292 | var i = 0;
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| 293 | var self = this;
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| 294 | var buffers = this._requestBodyBuffers;
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| 295 | (function writeNext(error) {
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| 296 | // Only write if this request has not been redirected yet
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| 297 | /* istanbul ignore else */
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| 298 | if (request === self._currentRequest) {
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| 299 | // Report any write errors
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| 300 | /* istanbul ignore if */
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| 301 | if (error) {
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| 302 | self.emit("error", error);
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| 303 | }
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| 304 | // Write the next buffer if there are still left
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| 305 | else if (i < buffers.length) {
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| 306 | var buffer = buffers[i++];
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| 307 | /* istanbul ignore else */
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| 308 | if (!request.finished) {
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| 309 | request.write(buffer.data, buffer.encoding, writeNext);
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| 310 | }
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| 311 | }
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| 312 | // End the request if `end` has been called on us
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| 313 | else if (self._ended) {
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| 314 | request.end();
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| 315 | }
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| 316 | }
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| 317 | }());
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| 318 | }
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| 319 | };
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| 320 |
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| 321 | // Processes a response from the current native request
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| 322 | RedirectableRequest.prototype._processResponse = function (response) {
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| 323 | // Store the redirected response
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| 324 | var statusCode = response.statusCode;
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| 325 | if (this._options.trackRedirects) {
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| 326 | this._redirects.push({
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| 327 | url: this._currentUrl,
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| 328 | headers: response.headers,
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| 329 | statusCode: statusCode,
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| 330 | });
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| 331 | }
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| 332 |
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| 333 | // RFC7231§6.4: The 3xx (Redirection) class of status code indicates
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| 334 | // that further action needs to be taken by the user agent in order to
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| 335 | // fulfill the request. If a Location header field is provided,
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| 336 | // the user agent MAY automatically redirect its request to the URI
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| 337 | // referenced by the Location field value,
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| 338 | // even if the specific status code is not understood.
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| 339 | var location = response.headers.location;
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| 340 | if (location && this._options.followRedirects !== false &&
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| 341 | statusCode >= 300 && statusCode < 400) {
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| 342 | // Abort the current request
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| 343 | abortRequest(this._currentRequest);
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| 344 | // Discard the remainder of the response to avoid waiting for data
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| 345 | response.destroy();
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| 346 |
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| 347 | // RFC7231§6.4: A client SHOULD detect and intervene
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| 348 | // in cyclical redirections (i.e., "infinite" redirection loops).
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| 349 | if (++this._redirectCount > this._options.maxRedirects) {
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| 350 | this.emit("error", new TooManyRedirectsError());
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| 351 | return;
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| 352 | }
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| 353 |
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| 354 | // RFC7231§6.4: Automatic redirection needs to done with
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| 355 | // care for methods not known to be safe, […]
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| 356 | // RFC7231§6.4.2–3: For historical reasons, a user agent MAY change
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| 357 | // the request method from POST to GET for the subsequent request.
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| 358 | if ((statusCode === 301 || statusCode === 302) && this._options.method === "POST" ||
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| 359 | // RFC7231§6.4.4: The 303 (See Other) status code indicates that
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| 360 | // the server is redirecting the user agent to a different resource […]
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| 361 | // A user agent can perform a retrieval request targeting that URI
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| 362 | // (a GET or HEAD request if using HTTP) […]
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| 363 | (statusCode === 303) && !/^(?:GET|HEAD)$/.test(this._options.method)) {
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| 364 | this._options.method = "GET";
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| 365 | // Drop a possible entity and headers related to it
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| 366 | this._requestBodyBuffers = [];
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| 367 | removeMatchingHeaders(/^content-/i, this._options.headers);
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| 368 | }
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| 369 |
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| 370 | // Drop the Host header, as the redirect might lead to a different host
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[e29cc2e] | 371 | var currentHostHeader = removeMatchingHeaders(/^host$/i, this._options.headers);
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| 372 |
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| 373 | // If the redirect is relative, carry over the host of the last request
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| 374 | var currentUrlParts = url.parse(this._currentUrl);
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| 375 | var currentHost = currentHostHeader || currentUrlParts.host;
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| 376 | var currentUrl = /^\w+:/.test(location) ? this._currentUrl :
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| 377 | url.format(Object.assign(currentUrlParts, { host: currentHost }));
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| 378 |
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| 379 | // Determine the URL of the redirection
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| 380 | var redirectUrl;
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| 381 | try {
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| 382 | redirectUrl = url.resolve(currentUrl, location);
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| 383 | }
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| 384 | catch (cause) {
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| 385 | this.emit("error", new RedirectionError(cause));
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| 386 | return;
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| 387 | }
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[6a3a178] | 388 |
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| 389 | // Create the redirected request
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| 390 | debug("redirecting to", redirectUrl);
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| 391 | this._isRedirect = true;
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| 392 | var redirectUrlParts = url.parse(redirectUrl);
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| 393 | Object.assign(this._options, redirectUrlParts);
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| 394 |
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[e29cc2e] | 395 | // Drop the Authorization header if redirecting to another domain
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| 396 | if (!(redirectUrlParts.host === currentHost || isSubdomainOf(redirectUrlParts.host, currentHost))) {
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[6a3a178] | 397 | removeMatchingHeaders(/^authorization$/i, this._options.headers);
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| 398 | }
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| 399 |
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| 400 | // Evaluate the beforeRedirect callback
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| 401 | if (typeof this._options.beforeRedirect === "function") {
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| 402 | var responseDetails = { headers: response.headers };
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| 403 | try {
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| 404 | this._options.beforeRedirect.call(null, this._options, responseDetails);
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| 405 | }
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| 406 | catch (err) {
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| 407 | this.emit("error", err);
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| 408 | return;
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| 409 | }
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| 410 | this._sanitizeOptions(this._options);
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| 411 | }
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| 412 |
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| 413 | // Perform the redirected request
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| 414 | try {
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| 415 | this._performRequest();
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| 416 | }
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| 417 | catch (cause) {
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[e29cc2e] | 418 | this.emit("error", new RedirectionError(cause));
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[6a3a178] | 419 | }
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| 420 | }
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| 421 | else {
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| 422 | // The response is not a redirect; return it as-is
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| 423 | response.responseUrl = this._currentUrl;
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| 424 | response.redirects = this._redirects;
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| 425 | this.emit("response", response);
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| 426 |
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| 427 | // Clean up
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| 428 | this._requestBodyBuffers = [];
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| 429 | }
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| 430 | };
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| 431 |
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| 432 | // Wraps the key/value object of protocols with redirect functionality
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| 433 | function wrap(protocols) {
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| 434 | // Default settings
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| 435 | var exports = {
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| 436 | maxRedirects: 21,
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| 437 | maxBodyLength: 10 * 1024 * 1024,
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| 438 | };
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| 439 |
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| 440 | // Wrap each protocol
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| 441 | var nativeProtocols = {};
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| 442 | Object.keys(protocols).forEach(function (scheme) {
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| 443 | var protocol = scheme + ":";
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| 444 | var nativeProtocol = nativeProtocols[protocol] = protocols[scheme];
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| 445 | var wrappedProtocol = exports[scheme] = Object.create(nativeProtocol);
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| 446 |
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| 447 | // Executes a request, following redirects
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| 448 | function request(input, options, callback) {
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| 449 | // Parse parameters
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| 450 | if (typeof input === "string") {
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| 451 | var urlStr = input;
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| 452 | try {
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| 453 | input = urlToOptions(new URL(urlStr));
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| 454 | }
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| 455 | catch (err) {
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| 456 | /* istanbul ignore next */
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| 457 | input = url.parse(urlStr);
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| 458 | }
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| 459 | }
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| 460 | else if (URL && (input instanceof URL)) {
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| 461 | input = urlToOptions(input);
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| 462 | }
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| 463 | else {
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| 464 | callback = options;
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| 465 | options = input;
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| 466 | input = { protocol: protocol };
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| 467 | }
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| 468 | if (typeof options === "function") {
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| 469 | callback = options;
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| 470 | options = null;
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| 471 | }
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| 472 |
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| 473 | // Set defaults
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| 474 | options = Object.assign({
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| 475 | maxRedirects: exports.maxRedirects,
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| 476 | maxBodyLength: exports.maxBodyLength,
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| 477 | }, input, options);
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| 478 | options.nativeProtocols = nativeProtocols;
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| 479 |
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| 480 | assert.equal(options.protocol, protocol, "protocol mismatch");
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| 481 | debug("options", options);
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| 482 | return new RedirectableRequest(options, callback);
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| 483 | }
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| 484 |
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| 485 | // Executes a GET request, following redirects
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| 486 | function get(input, options, callback) {
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| 487 | var wrappedRequest = wrappedProtocol.request(input, options, callback);
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| 488 | wrappedRequest.end();
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| 489 | return wrappedRequest;
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| 490 | }
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| 491 |
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| 492 | // Expose the properties on the wrapped protocol
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| 493 | Object.defineProperties(wrappedProtocol, {
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| 494 | request: { value: request, configurable: true, enumerable: true, writable: true },
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| 495 | get: { value: get, configurable: true, enumerable: true, writable: true },
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| 496 | });
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| 497 | });
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| 498 | return exports;
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| 499 | }
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| 500 |
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| 501 | /* istanbul ignore next */
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| 502 | function noop() { /* empty */ }
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| 503 |
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| 504 | // from https://github.com/nodejs/node/blob/master/lib/internal/url.js
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| 505 | function urlToOptions(urlObject) {
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| 506 | var options = {
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| 507 | protocol: urlObject.protocol,
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| 508 | hostname: urlObject.hostname.startsWith("[") ?
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| 509 | /* istanbul ignore next */
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| 510 | urlObject.hostname.slice(1, -1) :
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| 511 | urlObject.hostname,
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| 512 | hash: urlObject.hash,
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| 513 | search: urlObject.search,
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| 514 | pathname: urlObject.pathname,
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| 515 | path: urlObject.pathname + urlObject.search,
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| 516 | href: urlObject.href,
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| 517 | };
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| 518 | if (urlObject.port !== "") {
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| 519 | options.port = Number(urlObject.port);
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| 520 | }
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| 521 | return options;
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| 522 | }
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| 523 |
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| 524 | function removeMatchingHeaders(regex, headers) {
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| 525 | var lastValue;
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| 526 | for (var header in headers) {
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| 527 | if (regex.test(header)) {
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[e29cc2e] | 528 | lastValue = headers[header].toString().trim();
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[6a3a178] | 529 | delete headers[header];
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| 530 | }
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| 531 | }
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| 532 | return lastValue;
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| 533 | }
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| 534 |
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| 535 | function createErrorType(code, defaultMessage) {
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[e29cc2e] | 536 | function CustomError(cause) {
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[6a3a178] | 537 | Error.captureStackTrace(this, this.constructor);
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[e29cc2e] | 538 | if (!cause) {
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| 539 | this.message = defaultMessage;
|
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| 540 | }
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| 541 | else {
|
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| 542 | this.message = defaultMessage + ": " + cause.message;
|
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| 543 | this.cause = cause;
|
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| 544 | }
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[6a3a178] | 545 | }
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| 546 | CustomError.prototype = new Error();
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| 547 | CustomError.prototype.constructor = CustomError;
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| 548 | CustomError.prototype.name = "Error [" + code + "]";
|
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| 549 | CustomError.prototype.code = code;
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| 550 | return CustomError;
|
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| 551 | }
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| 552 |
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| 553 | function abortRequest(request) {
|
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| 554 | for (var e = 0; e < events.length; e++) {
|
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| 555 | request.removeListener(events[e], eventHandlers[events[e]]);
|
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| 556 | }
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| 557 | request.on("error", noop);
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| 558 | request.abort();
|
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| 559 | }
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| 560 |
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[e29cc2e] | 561 | function isSubdomainOf(subdomain, domain) {
|
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| 562 | const dot = subdomain.length - domain.length - 1;
|
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| 563 | return dot > 0 && subdomain[dot] === "." && subdomain.endsWith(domain);
|
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| 564 | }
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| 565 |
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[6a3a178] | 566 | // Exports
|
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| 567 | module.exports = wrap({ http: http, https: https });
|
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| 568 | module.exports.wrap = wrap;
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