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"use strict";
const http = require("http");
const https = require("https");
const { Writable } = require("stream");
const zlib = require("zlib");
const ver = process.version.replace("v", "").split(".");
const majorNodeVersion = Number.parseInt(ver[0]);
function abortRequest(clientRequest) {
// clientRequest.destroy breaks the test suite for versions 10 and 12,
// hence the version check
if (majorNodeVersion > 13) {
clientRequest.destroy();
} else {
clientRequest.abort();
}
clientRequest.removeAllListeners();
clientRequest.on("error", () => {});
}
module.exports = class Request extends Writable {
constructor(url, clientOptions, requestOptions) {
super();
Object.assign(this, clientOptions);
this.currentURL = url;
this._requestOptions = requestOptions;
this.headers = requestOptions.headers;
this._ended = false;
this._redirectCount = 0;
this._requestBodyBuffers = [];
this._bufferIndex = 0;
this._performRequest();
}
abort() {
abortRequest(this._currentRequest);
this.emit("abort");
this.removeAllListeners();
}
pipeRequest(form) {
form.pipe(this._currentRequest);
}
write(data, encoding) {
if (data.length > 0) {
this._requestBodyBuffers.push({ data, encoding });
this._currentRequest.write(data, encoding);
}
}
end() {
this.emit("request", this._currentRequest);
this._ended = true;
this._currentRequest.end();
}
setHeader(name, value) {
this.headers[name] = value;
this._currentRequest.setHeader(name, value);
}
removeHeader(name) {
delete this.headers[name];
this._currentRequest.removeHeader(name);
}
// Without this method, the test send-redirect-infinite-sync will halt the test suite
// TODO: investigate this further and ideally remove
toJSON() {
const { method, headers } = this._requestOptions;
return { uri: new URL(this.currentURL), method, headers };
}
_writeNext(error) {
if (this._currentRequest) {
if (error) {
this.emit("error", error);
} else if (this._bufferIndex < this._requestBodyBuffers.length) {
const buffer = this._requestBodyBuffers[this._bufferIndex++];
if (!this._currentRequest.writableEnded) {
this._currentRequest.write(
buffer.data,
buffer.encoding,
this._writeNext.bind(this)
);
}
} else if (this._ended) {
this._currentRequest.end();
}
}
}
_performRequest() {
const urlOptions = new URL(this.currentURL);
const scheme = urlOptions.protocol;
this._requestOptions.agent = this.agents[scheme.substring(0, scheme.length - 1)];
const { request } = scheme === "https:" ? https : http;
this._currentRequest = request(this.currentURL, this._requestOptions, response => {
this._processResponse(response);
});
let cookies;
if (this._redirectCount === 0) {
this.originalCookieHeader = this.getHeader("Cookie");
}
if (this.cookieJar) {
cookies = this.cookieJar.getCookieStringSync(this.currentURL);
}
if (cookies && cookies.length) {
if (this.originalCookieHeader) {
this.setHeader("Cookie", this.originalCookieHeader + "; " + cookies);
} else {
this.setHeader("Cookie", cookies);
}
}
for (const event of ["connect", "error", "socket", "timeout"]) {
this._currentRequest.on(event, (...args) => {
this.emit(event, ...args);
});
}
if (this._isRedirect) {
this._bufferIndex = 0;
this._writeNext();
}
}
_processResponse(response) {
const cookies = response.headers["set-cookie"];
if (this.cookieJar && Array.isArray(cookies)) {
try {
cookies.forEach(cookie => {
this.cookieJar.setCookieSync(cookie, this.currentURL, { ignoreError: true });
});
} catch (e) {
this.emit("error", e);
}
}
const { statusCode } = response;
const { location } = response.headers;
// In Node v15, aborting a message with remaining data causes an error to be thrown,
// hence the version check
const catchResErrors = err => {
if (!(majorNodeVersion >= 15 && err.message === "aborted")) {
this.emit("error", err);
}
};
response.on("error", catchResErrors);
let redirectAddress = null;
let resendWithAuth = false;
if (typeof location === "string" &&
location.length &&
this.followRedirects &&
statusCode >= 300 &&
statusCode < 400) {
redirectAddress = location;
} else if (statusCode === 401 &&
/^Basic /i.test(response.headers["www-authenticate"] || "") &&
(this.user && this.user.length)) {
this._requestOptions.auth = `${this.user}:${this.pass}`;
resendWithAuth = true;
}
if (redirectAddress || resendWithAuth) {
if (++this._redirectCount > 21) {
const redirectError = new Error("Maximum number of redirects exceeded");
redirectError.code = "ERR_TOO_MANY_REDIRECTS";
this.emit("error", redirectError);
return;
}
abortRequest(this._currentRequest);
response.destroy();
this._isRedirect = true;
if (((statusCode === 301 || statusCode === 302) && this._requestOptions.method === "POST") ||
(statusCode === 303 && !/^(?:GET|HEAD)$/.test(this._requestOptions.method))) {
this._requestOptions.method = "GET";
this._requestBodyBuffers = [];
}
let previousHostName = this._removeMatchingHeaders(/^host$/i);
if (!previousHostName) {
previousHostName = new URL(this.currentURL).hostname;
}
const previousURL = this.currentURL;
if (!resendWithAuth) {
const nextURL = redirectAddress.startsWith("https:") ?
new URL(redirectAddress) :
new URL(redirectAddress, this.currentURL);
if (nextURL.hostname !== previousHostName) {
this._removeMatchingHeaders(/^authorization$/i);
}
this.currentURL = nextURL.toString();
}
this.headers.Referer = previousURL;
this.emit("redirect", response, this.headers, this.currentURL);
try {
this._performRequest();
} catch (cause) {
this.emit("error", cause);
}
} else {
let pipeline = response;
const acceptEncoding = this.headers["Accept-Encoding"];
const requestCompressed = typeof acceptEncoding === "string" &&
(acceptEncoding.includes("gzip") || acceptEncoding.includes("deflate"));
if (
requestCompressed &&
this._requestOptions.method !== "HEAD" &&
statusCode >= 200 &&
statusCode !== 204 &&
statusCode !== 304
) {
const zlibOptions = {
flush: zlib.constants.Z_SYNC_FLUSH,
finishFlush: zlib.constants.Z_SYNC_FLUSH
};
const contentEncoding = (response.headers["content-encoding"] || "identity").trim().toLowerCase();
if (contentEncoding === "gzip") {
pipeline = zlib.createGunzip(zlibOptions);
response.pipe(pipeline);
} else if (contentEncoding === "deflate") {
pipeline = zlib.createInflate(zlibOptions);
response.pipe(pipeline);
}
}
pipeline.removeAllListeners("error");
this.emit("response", response, this.currentURL);
pipeline.on("data", bytes => this.emit("data", bytes));
pipeline.once("end", bytes => this.emit("end", bytes));
pipeline.on("error", catchResErrors);
pipeline.on("close", () => this.emit("close"));
this._requestBodyBuffers = [];
}
}
getHeader(key, value) {
if (this._currentRequest) {
return this._currentRequest.getHeader(key, value);
}
return null;
}
_removeMatchingHeaders(regex) {
let lastValue;
for (const header in this.headers) {
if (regex.test(header)) {
lastValue = this.headers[header];
delete this.headers[header];
}
}
return lastValue;
}
};
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