85 lines
3.0 KiB
JavaScript
85 lines
3.0 KiB
JavaScript
/*
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Copyright 2018 New Vector Ltd
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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// const OUTBOUND_API_NAME = 'toWidget';
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// Initiate requests using the "toWidget" postMessage API and handle responses
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// NOTE: ToWidgetPostMessageApi only handles message events with a data payload with a
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// response field
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export default class ToWidgetPostMessageApi {
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constructor(timeoutMs) {
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this._timeoutMs = timeoutMs || 5000; // default to 5s timer
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this._counter = 0;
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this._requestMap = {
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// $ID: {resolve, reject}
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};
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this.start = this.start.bind(this);
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this.stop = this.stop.bind(this);
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this.onPostMessage = this.onPostMessage.bind(this);
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}
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start() {
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window.addEventListener('message', this.onPostMessage);
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}
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stop() {
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window.removeEventListener('message', this.onPostMessage);
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}
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onPostMessage(ev) {
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// THIS IS ALL UNSAFE EXECUTION.
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// We do not verify who the sender of `ev` is!
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const payload = ev.data;
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// NOTE: Workaround for running in a mobile WebView where a
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// postMessage immediately triggers this callback even though it is
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// not the response.
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if (payload.response === undefined) {
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return;
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}
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const promise = this._requestMap[payload.requestId];
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if (!promise) {
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return;
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}
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delete this._requestMap[payload.requestId];
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promise.resolve(payload);
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}
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// Initiate outbound requests (toWidget)
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exec(action, targetWindow, targetOrigin) {
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targetWindow = targetWindow || window.parent; // default to parent window
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targetOrigin = targetOrigin || "*";
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this._counter += 1;
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action.requestId = Date.now() + "-" + Math.random().toString(36) + "-" + this._counter;
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return new Promise((resolve, reject) => {
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this._requestMap[action.requestId] = {resolve, reject};
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targetWindow.postMessage(action, targetOrigin);
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if (this._timeoutMs > 0) {
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setTimeout(() => {
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if (!this._requestMap[action.requestId]) {
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return;
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}
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console.error("postMessage request timed out. Sent object: " + JSON.stringify(action),
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this._requestMap);
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this._requestMap[action.requestId].reject(new Error("Timed out"));
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delete this._requestMap[action.requestId];
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}, this._timeoutMs);
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}
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});
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}
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}
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