58 lines
1.7 KiB
TypeScript
58 lines
1.7 KiB
TypeScript
import {Subject} from "rxjs";
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import {ChatEvent, isChatEvent} from "./Events/ChatEvent";
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import {IframeEvent, isIframeEventWrapper} from "./Events/IframeEvent";
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import {UserInputChatEvent} from "./Events/UserInputChatEvent";
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/**
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* Listens to messages from iframes and turn those messages into easy to use observables.
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*/
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class IframeListener {
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private readonly _chatStream: Subject<ChatEvent> = new Subject();
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public readonly chatStream = this._chatStream.asObservable();
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init() {
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window.addEventListener("message", (message) => {
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// Do we trust the sender of this message?
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//if (message.origin !== "http://example.com:8080")
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// return;
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// message.source is window.opener
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// message.data is the data sent by the iframe
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const payload = message.data;
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if (isIframeEventWrapper(payload)) {
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if (payload.type === 'chat' && isChatEvent(payload.data)) {
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this._chatStream.next(payload.data);
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}
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}
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}, false);
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}
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sendUserInputChat(message: string) {
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this.postMessage({
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'type': 'userInputChat',
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'data': {
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'message': message,
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} as UserInputChatEvent
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});
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}
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/**
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* Sends the message... to absolutely all the iFrames that can be found in the current document.
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*/
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private postMessage(message: IframeEvent) {
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// TODO: not the most effecient implementation if there are many events sent!
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for (const iframe of document.querySelectorAll<HTMLIFrameElement>('iframe')) {
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iframe.contentWindow?.postMessage(message, '*');
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}
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}
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}
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export const iframeListener = new IframeListener();
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