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/*
* Copyright (C) 2020-2021 Yomichan Authors
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
/* global
* api
*/
class FrameEndpoint {
constructor() {
this._secret = generateId(16);
this._token = null;
this._eventListeners = new EventListenerCollection();
this._eventListenersSetup = false;
}
signal() {
if (!this._eventListenersSetup) {
this._eventListeners.addEventListener(window, 'message', this._onMessage.bind(this), false);
this._eventListenersSetup = true;
}
api.broadcastTab('frameEndpointReady', {secret: this._secret});
}
authenticate(message) {
return (
this._token !== null &&
isObject(message) &&
this._token === message.token &&
this._secret === message.secret
);
}
_onMessage(e) {
if (this._token !== null) { return; } // Already initialized
const data = e.data;
if (!isObject(data) || data.action !== 'frameEndpointConnect') { return; } // Invalid message
const params = data.params;
if (!isObject(params)) { return; } // Invalid data
const secret = params.secret;
if (secret !== this._secret) { return; } // Invalid authentication
const {token, hostFrameId} = params;
this._token = token;
this._eventListeners.removeAllEventListeners();
api.sendMessageToFrame(hostFrameId, 'frameEndpointConnected', {secret, token});
}
}
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