websocket.ts
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/**
* @license
* Copyright Google Inc. All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import {patchEventTargetMethods, patchOnProperties} from '../common/utils';
// we have to patch the instance since the proto is non-configurable
export function apply(_global: any) {
const WS = (<any>_global).WebSocket;
// On Safari window.EventTarget doesn't exist so need to patch WS add/removeEventListener
// On older Chrome, no need since EventTarget was already patched
if (!(<any>_global).EventTarget) {
patchEventTargetMethods(WS.prototype);
}
(<any>_global).WebSocket = function(a, b) {
const socket = arguments.length > 1 ? new WS(a, b) : new WS(a);
let proxySocket;
// Safari 7.0 has non-configurable own 'onmessage' and friends properties on the socket instance
const onmessageDesc = Object.getOwnPropertyDescriptor(socket, 'onmessage');
if (onmessageDesc && onmessageDesc.configurable === false) {
proxySocket = Object.create(socket);
['addEventListener', 'removeEventListener', 'send', 'close'].forEach(function(propName) {
proxySocket[propName] = function() {
return socket[propName].apply(socket, arguments);
};
});
} else {
// we can patch the real socket
proxySocket = socket;
}
patchOnProperties(proxySocket, ['close', 'error', 'message', 'open']);
return proxySocket;
};
for (const prop in WS) {
_global.WebSocket[prop] = WS[prop];
}
}