superagent/lib/node/http2wrapper.js

elegant & feature rich browser / node HTTP with a fluent API

"use strict";

const http2 = require('http2');
const Stream = require('stream');
const net = require('net');
const tls = require('tls');
const {
  isSafeKey
} = require('../utils');
const {
  HTTP2_HEADER_PATH,
  HTTP2_HEADER_STATUS,
  HTTP2_HEADER_METHOD,
  HTTP2_HEADER_AUTHORITY,
  HTTP2_HEADER_HOST,
  HTTP2_HEADER_SET_COOKIE,
  NGHTTP2_CANCEL
} = http2.constants;
function setProtocol(protocol) {
  return {
    request(options) {
      return new Request(protocol, options);
    }
  };
}
function normalizeIpv6Host(host) {
  return net.isIP(host) === 6 ? `[${host}]` : host;
}
class Request extends Stream {
  constructor(protocol, options) {
    super();
    const defaultPort = protocol === 'https:' ? 443 : 80;
    const defaultHost = 'localhost';
    const port = options.port || defaultPort;
    const host = options.host || defaultHost;
    delete options.port;
    delete options.host;
    this.method = options.method;
    this.path = options.path;
    this.protocol = protocol;
    this.host = host;
    delete options.method;
    delete options.path;
    const sessionOptions = {
      ...options
    };
    if (options.socketPath) {
      sessionOptions.socketPath = options.socketPath;
      sessionOptions.createConnection = this.createUnixConnection.bind(this);
    }
    this._headers = {};
    const normalizedHost = normalizeIpv6Host(host);
    const session = http2.connect(`${protocol}//${normalizedHost}:${port}`, sessionOptions);
    this.setHeader('host', `${normalizedHost}:${port}`);
    session.on('error', error => this.emit('error', error));
    this.session = session;
  }
  createUnixConnection(authority, options) {
    switch (this.protocol) {
      case 'http:':
        return net.connect(options.socketPath);
      case 'https:':
        options.ALPNProtocols = ['h2'];
        options.servername = this.host;
        options.allowHalfOpen = true;
        return tls.connect(options.socketPath, options);
      default:
        throw new Error('Unsupported protocol', this.protocol);
    }
  }
  setNoDelay(bool) {
    // We can not use setNoDelay with HTTP/2.
    // Node 10 limits http2session.socket methods to ones safe to use with HTTP/2.
    // See also https://nodejs.org/api/http2.html#http2_http2session_socket
  }
  getFrame() {
    if (this.frame) {
      return this.frame;
    }
    const method = {
      [HTTP2_HEADER_PATH]: this.path,
      [HTTP2_HEADER_METHOD]: this.method
    };
    let headers = this.mapToHttp2Header(this._headers);
    headers = Object.assign(headers, method);
    const frame = this.session.request(headers);
    frame.once('response', (headers, flags) => {
      headers = this.mapToHttpHeader(headers);
      frame.headers = headers;
      frame.statusCode = headers[HTTP2_HEADER_STATUS];
      frame.status = frame.statusCode;
      this.emit('response', frame);
    });
    this._headerSent = true;
    frame.on('drain', () => this.emit('drain'));
    frame.on('error', error => this.emit('error', error));
    frame.on('close', () => this.session.close());
    this.frame = frame;
    return frame;
  }
  mapToHttpHeader(headers) {
    const keys = Object.keys(headers);
    const http2Headers = {};
    for (let key of keys) {
      let value = headers[key];
      key = key.toLowerCase();
      // header names come from the peer; never let one such as "__proto__"
      // reach into the prototype chain of the headers object
      if (!isSafeKey(key)) continue;
      switch (key) {
        case HTTP2_HEADER_SET_COOKIE:
          value = Array.isArray(value) ? value : [value];
          break;
        default:
          break;
      }
      http2Headers[key] = value;
    }
    return http2Headers;
  }
  mapToHttp2Header(headers) {
    const keys = Object.keys(headers);
    const http2Headers = {};
    for (let key of keys) {
      let value = headers[key];
      key = key.toLowerCase();
      switch (key) {
        case HTTP2_HEADER_HOST:
          key = HTTP2_HEADER_AUTHORITY;
          value = /^http:\/\/|^https:\/\//.test(value) ? new URL(value).host : value;
          break;
        default:
          break;
      }
      http2Headers[key] = value;
    }
    return http2Headers;
  }
  setHeader(name, value) {
    this._headers[name.toLowerCase()] = value;
  }
  getHeader(name) {
    return this._headers[name.toLowerCase()];
  }
  write(data, encoding) {
    const frame = this.getFrame();
    return frame.write(data, encoding);
  }
  pipe(stream, options) {
    const frame = this.getFrame();
    return frame.pipe(stream, options);
  }
  end(data) {
    const frame = this.getFrame();
    frame.end(data);
  }
  abort(data) {
    const frame = this.getFrame();
    frame.close(NGHTTP2_CANCEL);
    this.session.destroy();
  }
  _destroy(error, callback) {
    try {
      if (this.frame) {
        this.frame.close(NGHTTP2_CANCEL);
      }
    } catch (err) {
      // ignore
    }
    try {
      if (this.session && !this.session.destroyed) {
        this.session.destroy();
      }
    } catch (err) {
      // ignore
    }
    callback(error);
  }
}
exports.setProtocol = setProtocol;
//# sourceMappingURL=data:application/json;charset=utf-8;base64,{"version":3,"names":["http2","require","Stream","net","tls","isSafeKey","HTTP2_HEADER_PATH","HTTP2_HEADER_STATUS","HTTP2_HEADER_METHOD","HTTP2_HEADER_AUTHORITY","HTTP2_HEADER_HOST","HTTP2_HEADER_SET_COOKIE","NGHTTP2_CANCEL","constants","setProtocol","protocol","request","options","Request","normalizeIpv6Host","host","isIP","constructor","defaultPort","defaultHost","port","method","path","sessionOptions","socketPath","createConnection","createUnixConnection","bind","_headers","normalizedHost","session","connect","setHeader","on","error","emit","authority","ALPNProtocols","servername","allowHalfOpen","Error","setNoDelay","bool","getFrame","frame","headers","mapToHttp2Header","Object","assign","once","flags","mapToHttpHeader","statusCode","status","_headerSent","close","keys","http2Headers","key","value","toLowerCase","Array","isArray","test","URL","name","getHeader","write","data","encoding","pipe","stream","end","abort","destroy","_destroy","callback","err","destroyed","exports"],"sources":["../../src/node/http2wrapper.js"],"sourcesContent":["const http2 = require('http2');\nconst Stream = require('stream');\nconst net = require('net');\nconst tls = require('tls');\nconst { isSafeKey } = require('../utils');\n\nconst {\n  HTTP2_HEADER_PATH,\n  HTTP2_HEADER_STATUS,\n  HTTP2_HEADER_METHOD,\n  HTTP2_HEADER_AUTHORITY,\n  HTTP2_HEADER_HOST,\n  HTTP2_HEADER_SET_COOKIE,\n  NGHTTP2_CANCEL\n} = http2.constants;\n\nfunction setProtocol(protocol) {\n  return {\n    request(options) {\n      return new Request(protocol, options);\n    }\n  };\n}\n\nfunction normalizeIpv6Host(host) {\n  return net.isIP(host) === 6 ? `[${host}]` : host;\n}\n\nclass Request extends Stream {\n  constructor(protocol, options) {\n    super();\n    const defaultPort = protocol === 'https:' ? 443 : 80;\n    const defaultHost = 'localhost';\n    const port = options.port || defaultPort;\n    const host = options.host || defaultHost;\n\n    delete options.port;\n    delete options.host;\n\n    this.method = options.method;\n    this.path = options.path;\n    this.protocol = protocol;\n    this.host = host;\n\n    delete options.method;\n    delete options.path;\n\n    const sessionOptions = { ...options };\n    if (options.socketPath) {\n      sessionOptions.socketPath = options.socketPath;\n      sessionOptions.createConnection = this.createUnixConnection.bind(this);\n    }\n\n    this._headers = {};\n\n    const normalizedHost = normalizeIpv6Host(host);\n    const session = http2.connect(\n      `${protocol}//${normalizedHost}:${port}`,\n      sessionOptions\n    );\n    this.setHeader('host', `${normalizedHost}:${port}`);\n\n    session.on('error', (error) => this.emit('error', error));\n\n    this.session = session;\n  }\n\n  createUnixConnection(authority, options) {\n    switch (this.protocol) {\n      case 'http:':\n        return net.connect(options.socketPath);\n      case 'https:':\n        options.ALPNProtocols = ['h2'];\n        options.servername = this.host;\n        options.allowHalfOpen = true;\n        return tls.connect(options.socketPath, options);\n      default:\n        throw new Error('Unsupported protocol', this.protocol);\n    }\n  }\n\n  setNoDelay(bool) {\n    // We can not use setNoDelay with HTTP/2.\n    // Node 10 limits http2session.socket methods to ones safe to use with HTTP/2.\n    // See also https://nodejs.org/api/http2.html#http2_http2session_socket\n  }\n\n  getFrame() {\n    if (this.frame) {\n      return this.frame;\n    }\n\n    const method = {\n      [HTTP2_HEADER_PATH]: this.path,\n      [HTTP2_HEADER_METHOD]: this.method\n    };\n\n    let headers = this.mapToHttp2Header(this._headers);\n\n    headers = Object.assign(headers, method);\n\n    const frame = this.session.request(headers);\n\n    frame.once('response', (headers, flags) => {\n      headers = this.mapToHttpHeader(headers);\n      frame.headers = headers;\n      frame.statusCode = headers[HTTP2_HEADER_STATUS];\n      frame.status = frame.statusCode;\n      this.emit('response', frame);\n    });\n\n    this._headerSent = true;\n\n    frame.on('drain', () => this.emit('drain'));\n    frame.on('error', (error) => this.emit('error', error));\n    frame.on('close', () => this.session.close());\n\n    this.frame = frame;\n    return frame;\n  }\n\n  mapToHttpHeader(headers) {\n    const keys = Object.keys(headers);\n    const http2Headers = {};\n    for (let key of keys) {\n      let value = headers[key];\n      key = key.toLowerCase();\n      // header names come from the peer; never let one such as \"__proto__\"\n      // reach into the prototype chain of the headers object\n      if (!isSafeKey(key)) continue;\n      switch (key) {\n        case HTTP2_HEADER_SET_COOKIE:\n          value = Array.isArray(value) ? value : [value];\n          break;\n        default:\n          break;\n      }\n\n      http2Headers[key] = value;\n    }\n\n    return http2Headers;\n  }\n\n  mapToHttp2Header(headers) {\n    const keys = Object.keys(headers);\n    const http2Headers = {};\n    for (let key of keys) {\n      let value = headers[key];\n      key = key.toLowerCase();\n      switch (key) {\n        case HTTP2_HEADER_HOST:\n          key = HTTP2_HEADER_AUTHORITY;\n          value = /^http:\\/\\/|^https:\\/\\//.test(value)\n            ? new URL(value).host\n            : value;\n          break;\n        default:\n          break;\n      }\n\n      http2Headers[key] = value;\n    }\n\n    return http2Headers;\n  }\n\n  setHeader(name, value) {\n    this._headers[name.toLowerCase()] = value;\n  }\n\n  getHeader(name) {\n    return this._headers[name.toLowerCase()];\n  }\n\n  write(data, encoding) {\n    const frame = this.getFrame();\n    return frame.write(data, encoding);\n  }\n\n  pipe(stream, options) {\n    const frame = this.getFrame();\n    return frame.pipe(stream, options);\n  }\n\n  end(data) {\n    const frame = this.getFrame();\n    frame.end(data);\n  }\n\n  abort(data) {\n    const frame = this.getFrame();\n    frame.close(NGHTTP2_CANCEL);\n    this.session.destroy();\n  }\n\n  _destroy(error, callback) {\n    try {\n      if (this.frame) {\n        this.frame.close(NGHTTP2_CANCEL);\n      }\n    } catch (err) {\n      // ignore\n    }\n\n    try {\n      if (this.session && !this.session.destroyed) {\n        this.session.destroy();\n      }\n    } catch (err) {\n      // ignore\n    }\n\n    callback(error);\n  }\n}\n\nexports.setProtocol = 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