matrix-dimension/web/app/shared/scalar.service.ts

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import { Injectable } from "@angular/core";
import * as randomString from "random-string";
import { MembershipStateResponse, ScalarSuccessResponse } from "./models/scalar_responses";
@Injectable()
export class ScalarService {
private static actionMap: {[key: string]: {resolve: (obj: any) => void, reject: (obj: any) => void}} = {};
public static getAndRemoveActionHandler(requestKey: string): {resolve: (obj: any) => void, reject: (obj: any) => void} {
let handler = ScalarService.actionMap[requestKey];
ScalarService.actionMap[requestKey] = null;
return handler;
}
constructor() {
}
public inviteUser(roomId: string, userId): Promise<ScalarSuccessResponse> {
return this.callAction("invite", {
room_id: roomId,
user_id: userId
});
}
public getMembershipState(roomId: string, userId: string): Promise<MembershipStateResponse> {
return this.callAction("membership_state", {
room_id: roomId,
user_id: userId
});
}
public close(): void {
this.callAction("close_scalar", {});
}
private callAction(action, payload) {
let requestKey = randomString({length: 20});
return new Promise((resolve, reject) => {
if (!window.opener) {
// Mimic an error response from scalar
reject({response: {error: {message: "No window.opener", _error: new Error("No window.opener")}}});
return;
}
ScalarService.actionMap[requestKey] = {
resolve: resolve,
reject: reject
};
let request = JSON.parse(JSON.stringify(payload));
request["request_id"] = requestKey;
request["action"] = action;
window.opener.postMessage(request, "*");
});
}
}
// Register the event listener here to ensure it gets created
window.addEventListener("message", event => {
if (!event.data) return;
let requestKey = event.data["request_id"];
if (!requestKey) return;
let action = ScalarService.getAndRemoveActionHandler(requestKey);
if (!action) return;
if (event.data.response && event.data.response.error) action.reject(event.data);
else action.resolve(event.data);
});