node/lib/http.js

// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

'use strict';

const {
  ObjectDefineProperty,
  Uint8Array,
} = primordials;

const { validateInteger, validateObject } = require('internal/validators');
const httpAgent = require('_http_agent');
const { ClientRequest } = require('_http_client');
const { methods, parsers } = require('_http_common');
const { IncomingMessage } = require('_http_incoming');
const {
  ERR_INVALID_ARG_TYPE,
  ERR_INVALID_ARG_VALUE,
  ERR_OUT_OF_RANGE,
  ERR_PROXY_INVALID_CONFIG,
} = require('internal/errors').codes;
const {
  isArrayBufferView,
  isUint8Array,
} = require('internal/util/types');
const { mask: bindingMask } = internalBinding('buffer');
const {
  isValidHeaderName,
  isValidHeaderValue,
  validateHeaderName,
  validateHeaderValue,
  OutgoingMessage,
} = require('_http_outgoing');
const {
  _connectionListener,
  STATUS_CODES,
  Server,
  ServerResponse,
} = require('_http_server');
const {
  parseProxyUrl,
  getGlobalAgent,
} = require('internal/http');
const { URL } = require('internal/url');
let maxHeaderSize;
let undici;

/**
 * Returns a new instance of `http.Server`.
 * @param {{
 *   IncomingMessage?: IncomingMessage;
 *   ServerResponse?: ServerResponse;
 *   insecureHTTPParser?: boolean;
 *   maxHeaderSize?: number;
 *   requireHostHeader?: boolean;
 *   joinDuplicateHeaders?: boolean;
 *   highWaterMark?: number;
 *   rejectNonStandardBodyWrites?: boolean;
 *   }} [opts]
 * @param {Function} [requestListener]
 * @returns {Server}
 */
function createServer(opts, requestListener) {
  return new Server(opts, requestListener);
}

/**
 * @typedef {object} HTTPRequestOptions
 * @property {httpAgent.Agent | boolean} [agent] Controls Agent behavior.
 * @property {string} [auth] Basic authentication ('user:password') to compute an Authorization header.
 * @property {Function} [createConnection] Produces a socket/stream to use when the agent option is not used.
 * @property {number} [defaultPort] Default port for the protocol.
 * @property {number} [family] IP address family to use when resolving host or hostname.
 * @property {object} [headers] An object containing request headers.
 * @property {number} [hints] Optional dns.lookup() hints.
 * @property {string} [host] A domain name or IP address of the server to issue the request to.
 * @property {string} [hostname] Alias for host.
 * @property {boolean} [insecureHTTPParser] Use an insecure HTTP parser that accepts invalid HTTP headers when true.
 * @property {boolean} [joinDuplicateHeaders] Multiple header that joined with `,` field line values.
 * @property {string} [localAddress] Local interface to bind for network connections.
 * @property {number} [localPort] Local port to connect from.
 * @property {Function} [lookup] Custom lookup function. Default: dns.lookup().
 * @property {number} [maxHeaderSize] Overrides the --max-http-header-size value for responses received from the server.
 * @property {string} [method] A string specifying the HTTP request method.
 * @property {string} [path] Request path.
 * @property {number} [port] Port of remote server.
 * @property {string} [protocol] Protocol to use.
 * @property {boolean} [setHost] Specifies whether or not to automatically add the Host header.
 * @property {AbortSignal} [signal] An AbortSignal that may be used to abort an ongoing request.
 * @property {string} [socketPath] Unix domain socket.
 * @property {number} [timeout] A number specifying the socket timeout in milliseconds.
 * @property {Array} [uniqueHeaders] A list of request headers that should be sent only once.
 */

/**
 * Makes an HTTP request.
 * @param {string | URL} url
 * @param {HTTPRequestOptions} [options]
 * @param {Function} [cb]
 * @returns {ClientRequest}
 */
function request(url, options, cb) {
  return new ClientRequest(url, options, cb);
}

/**
 * Makes a `GET` HTTP request.
 * @param {string | URL} url
 * @param {HTTPRequestOptions} [options]
 * @param {Function} [cb]
 * @returns {ClientRequest}
 */
function get(url, options, cb) {
  const req = request(url, options, cb);
  req.end();
  return req;
}

/**
 * Lazy loads WebSocket, CloseEvent and MessageEvent classes from undici
 * @returns {object} An object containing WebSocket, CloseEvent, and MessageEvent classes.
 */
function lazyUndici() {
  return undici ??= require('internal/deps/undici/undici');
}

function setGlobalProxyFromEnv(env = process.env) {
  validateObject(env, 'proxyEnv');
  const httpProxy = parseProxyUrl(env, 'http:');
  const httpsProxy = parseProxyUrl(env, 'https:');
  const noProxy = env.no_proxy || env.NO_PROXY;

  if (!httpProxy && !httpsProxy) {
    return () => {};
  }

  if (httpProxy && !URL.canParse(httpProxy)) {
    throw new ERR_PROXY_INVALID_CONFIG(httpProxy);
  }
  if (httpsProxy && !URL.canParse(httpsProxy)) {
    throw new ERR_PROXY_INVALID_CONFIG(httpsProxy);
  }

  let originalDispatcher, originalHttpsAgent, originalHttpAgent;
  if (httpProxy || httpsProxy) {
    // Set it for fetch.
    const { setGlobalDispatcher, getGlobalDispatcher, EnvHttpProxyAgent } = lazyUndici();
    const envHttpProxyAgent = new EnvHttpProxyAgent({
      __proto__: null, httpProxy, httpsProxy, noProxy,
    });
    originalDispatcher = getGlobalDispatcher();
    setGlobalDispatcher(envHttpProxyAgent);
  }

  if (httpProxy) {
    originalHttpAgent = module.exports.globalAgent;
    module.exports.globalAgent = getGlobalAgent(env, httpAgent.Agent);
  }
  if (httpsProxy && !!process.versions.openssl) {
    const https = require('https');
    originalHttpsAgent = https.globalAgent;
    https.globalAgent = getGlobalAgent(env, https.Agent);
  }

  return function restore() {
    if (originalDispatcher) {
      const { setGlobalDispatcher } = lazyUndici();
      setGlobalDispatcher(originalDispatcher);
    }
    if (originalHttpAgent) {
      module.exports.globalAgent = originalHttpAgent;
    }
    if (originalHttpsAgent) {
      require('https').globalAgent = originalHttpsAgent;
    }
  };
}

/**
 * Packs a 4-byte mask into a uint32, with byte k in bits 8k..8k+7.
 * @param {ArrayBufferView} key
 * @returns {number}
 */
function maskKeyToUint32(key) {
  if (!isArrayBufferView(key)) {
    throw new ERR_INVALID_ARG_TYPE('mask', ['Buffer', 'TypedArray', 'DataView'], key);
  }
  if (key.byteLength !== 4) {
    throw new ERR_INVALID_ARG_VALUE('mask', key, 'must be 4 bytes long');
  }
  const bytes = isUint8Array(key) ?
    /** @type {Uint8Array} */ (key) :
    new Uint8Array(key.buffer, key.byteOffset, 4);
  return (bytes[0] | (bytes[1] << 8) | (bytes[2] << 16) | (bytes[3] << 24)) >>> 0;
}

/**
 * XORs `length` bytes of `source` with the repeating 4-byte `key` and writes
 * the result to `output` at `offset` (RFC 6455, Section 5.3).
 * @param {ArrayBufferView} source
 * @param {ArrayBufferView} key
 * @param {ArrayBufferView} output
 * @param {number} offset
 * @param {number} length
 * @returns {void}
 */
function websocketMask(source, key, output, offset, length) {
  if (!isArrayBufferView(source)) {
    throw new ERR_INVALID_ARG_TYPE('source', ['Buffer', 'TypedArray', 'DataView'], source);
  }
  const maskValue = maskKeyToUint32(key);
  if (!isArrayBufferView(output)) {
    throw new ERR_INVALID_ARG_TYPE('output', ['Buffer', 'TypedArray', 'DataView'], output);
  }
  const outputLength = output.byteLength;
  validateInteger(offset, 'offset', 0, outputLength);
  validateInteger(length, 'length', 0, source.byteLength);
  if (length > outputLength - offset) {
    throw new ERR_OUT_OF_RANGE('length', `<= ${outputLength - offset}`, length);
  }
  if (!bindingMask(source, output, offset, length, maskValue)) {
    throw new ERR_INVALID_ARG_VALUE(
      'output', output, 'must not be backed by an immutable ArrayBuffer');
  }
}

/**
 * XORs every byte of `buffer` with the repeating 4-byte `key`, in place.
 * @param {ArrayBufferView} buffer
 * @param {ArrayBufferView} key
 * @returns {void}
 */
function websocketUnmask(buffer, key) {
  if (!isArrayBufferView(buffer)) {
    throw new ERR_INVALID_ARG_TYPE('buffer', ['Buffer', 'TypedArray', 'DataView'], buffer);
  }
  const maskValue = maskKeyToUint32(key);
  if (!bindingMask(buffer, buffer, 0, buffer.byteLength, maskValue)) {
    throw new ERR_INVALID_ARG_VALUE(
      'buffer', buffer, 'must not be backed by an immutable ArrayBuffer');
  }
}

module.exports = {
  _connectionListener,
  METHODS: methods.toSorted(),
  STATUS_CODES,
  Agent: httpAgent.Agent,
  ClientRequest,
  IncomingMessage,
  OutgoingMessage,
  Server,
  ServerResponse,
  createServer,
  isValidHeaderName,
  isValidHeaderValue,
  validateHeaderName,
  validateHeaderValue,
  get,
  request,
  setMaxIdleHTTPParsers(max) {
    validateInteger(max, 'max', 1);
    parsers.max = max;
  },
  setGlobalProxyFromEnv,
  websocketMask,
  websocketUnmask,
};

ObjectDefineProperty(module.exports, 'maxHeaderSize', {
  __proto__: null,
  configurable: true,
  enumerable: true,
  get() {
    if (maxHeaderSize === undefined) {
      const { getOptionValue } = require('internal/options');
      maxHeaderSize = getOptionValue('--max-http-header-size');
    }

    return maxHeaderSize;
  },
});

ObjectDefineProperty(module.exports, 'globalAgent', {
  __proto__: null,
  configurable: true,
  enumerable: true,
  get() {
    return httpAgent.globalAgent;
  },
  set(value) {
    httpAgent.globalAgent = value;
  },
});

ObjectDefineProperty(module.exports, 'WebSocket', {
  __proto__: null,
  configurable: true,
  enumerable: true,
  get() {
    return lazyUndici().WebSocket;
  },
});

ObjectDefineProperty(module.exports, 'CloseEvent', {
  __proto__: null,
  configurable: true,
  enumerable: true,
  get() {
    return lazyUndici().CloseEvent;
  },
});

ObjectDefineProperty(module.exports, 'MessageEvent', {
  __proto__: null,
  configurable: true,
  enumerable: true,
  get() {
    return lazyUndici().MessageEvent;
  },
});