text: /**
   * Copyright (c) 2015-present, Facebook, Inc.
   * All rights reserved.
   *
   * This source code is licensed under the BSD-style license found in the
   * LICENSE file in the root directory of this source tree. An additional grant
   * of patent rights can be found in the PATENTS file in the same directory.
   *
   * @providesModule WebSocket
   * @flow
   */
  'use strict';
  
  const NativeEventEmitter = require('NativeEventEmitter');
  const Platform = require('Platform');
  const RCTWebSocketModule = require('NativeModules').WebSocketModule;
  const WebSocketEvent = require('WebSocketEvent');
  
  const EventTarget = require('event-target-shim');
  const base64 = require('base64-js');
  
  import type EventSubscription from 'EventSubscription';
  
  type ArrayBufferView =
    Int8Array |
    Uint8Array |
    Uint8ClampedArray |
    Int16Array |
    Uint16Array |
    Int32Array |
    Uint32Array |
    Float32Array |
    Float64Array |
    DataView;
  
  const CONNECTING = 0;
  const OPEN = 1;
  const CLOSING = 2;
  const CLOSED = 3;
  
  const CLOSE_NORMAL = 1000;
  
  const WEBSOCKET_EVENTS = [
    'close',
    'error',
    'message',
    'open',
  ];
  
  let nextWebSocketId = 0;
  
  /**
   * Browser-compatible WebSockets implementation.
   *
   * See https://developer.mozilla.org/en-US/docs/Web/API/WebSocket
   * See https://github.com/websockets/ws
   */
  class WebSocket extends EventTarget(...WEBSOCKET_EVENTS) {
    static CONNECTING = CONNECTING;
    static OPEN = OPEN;
    static CLOSING = CLOSING;
    static CLOSED = CLOSED;
  
    CONNECTING: number = CONNECTING;
    OPEN: number = OPEN;
    CLOSING: number = CLOSING;
    CLOSED: number = CLOSED;
  
    _socketId: number;
    _eventEmitter: NativeEventEmitter;
    _subscriptions: Array<EventSubscription>;
  
    onclose: ?Function;
    onerror: ?Function;
    onmessage: ?Function;
    onopen: ?Function;
  
    binaryType: ?string;
    bufferedAmount: number;
    extension: ?string;
    protocol: ?string;
    readyState: number = CONNECTING;
    url: ?string;
  
    constructor(url: string, protocols: ?string | ?Array<string>, options: ?{origin?: string}) {
      super();
      if (typeof protocols === 'string') {
        protocols = [protocols];
      }
  
      if (!Array.isArray(protocols)) {
        protocols = null;
      }
  
      this._eventEmitter = new NativeEventEmitter(RCTWebSocketModule);
      this._socketId = nextWebSocketId++;
      RCTWebSocketModule.connect(url, protocols, options, this._socketId);
      this._registerEvents();
    }
  
    close(code?: number, reason?: string): void {
      if (this.readyState === this.CLOSING ||
          this.readyState === this.CLOSED) {
        return;
      }
  
      this.readyState = this.CLOSING;
      this._close(code, reason);
    }
  
    send(data: string | ArrayBuffer | ArrayBufferView): void {
      if (this.readyState === this.CONNECTING) {
        throw new Error('INVALID_STATE_ERR');
      }
  
      if (typeof data === 'string') {
        RCTWebSocketModule.send(data, this._socketId);
        return;
      }
  
      // Maintain iOS 7 compatibility which doesn't have JS typed arrays.
      if (typeof ArrayBuffer !== 'undefined' &&
          typeof Uint8Array !== 'undefined') {
        if (ArrayBuffer.isView(data)) {
          // $FlowFixMe: no way to assert that 'data' is indeed an ArrayBufferView now
          data = data.buffer;
        }
        if (data instanceof ArrayBuffer) {
          data = base64.fromByteArray(new Uint8Array(data));
          RCTWebSocketModule.sendBinary(data, this._socketId);
          return;
        }
      }
  
      throw new Error('Unsupported data type');
    }
  
    _close(code?: number, reason?: string): void {
      if (Platform.OS === 'android') {
        // See https://developer.mozilla.org/en-US/docs/Web/API/CloseEvent
        const statusCode = typeof code === 'number' ? code : CLOSE_NORMAL;
        const closeReason = typeof reason === 'string' ? reason : '';
        RCTWebSocketModule.close(statusCode, closeReason, this._socketId);
      } else {
        RCTWebSocketModule.close(this._socketId);
      }
    }
  
    _unregisterEvents(): void {
      this._subscriptions.forEach(e => e.remove());
      this._subscriptions = [];
    }
  
    _registerEvents(): void {
      this._subscriptions = [
        this._eventEmitter.addListener('websocketMessage', ev => {
          if (ev.id !== this._socketId) {
            return;
          }
          this.dispatchEvent(new WebSocketEvent('message', {
            data: (ev.type === 'binary') ? base64.toByteArray(ev.data).buffer : ev.data
          }));
        }),
        this._eventEmitter.addListener('websocketOpen', ev => {
          if (ev.id !== this._socketId) {
            return;
          }
          this.readyState = this.OPEN;
          this.dispatchEvent(new WebSocketEvent('open'));
        }),
        this._eventEmitter.addListener('websocketClosed', ev => {
          if (ev.id !== this._socketId) {
            return;
          }
          this.readyState = this.CLOSED;
          this.dispatchEvent(new WebSocketEvent('close', {
            code: ev.code,
            reason: ev.reason,
          }));
          this._unregisterEvents();
          this.close();
        }),
        this._eventEmitter.addListener('websocketFailed', ev => {
          if (ev.id !== this._socketId) {
            return;
          }
          this.dispatchEvent(new WebSocketEvent('error', {
            message: ev.message,
          }));
          this.dispatchEvent(new WebSocketEvent('close', {
            message: ev.message,
          }));
          this._unregisterEvents();
          this.close();
        })
      ];
    }
  }
  
  module.exports = WebSocket;
  