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/*
* Copyright (C) 2023-2024 Yomitan Authors
* Copyright (C) 2020-2022 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/>.
*/
import {EventListenerCollection} from '../core/event-listener-collection.js';
import {generateId} from '../core/utilities.js';
export class FrameEndpoint {
/**
* @param {import('../comm/api.js').API} api
*/
constructor(api) {
/** @type {import('../comm/api.js').API} */
this._api = api;
/** @type {string} */
this._secret = generateId(16);
/** @type {?string} */
this._token = null;
/** @type {EventListenerCollection} */
this._eventListeners = new EventListenerCollection();
/** @type {boolean} */
this._eventListenersSetup = false;
}
/**
* @returns {void}
*/
signal() {
if (!this._eventListenersSetup) {
this._eventListeners.addEventListener(window, 'message', this._onMessage.bind(this), false);
this._eventListenersSetup = true;
}
/** @type {import('frame-client').FrameEndpointReadyDetails} */
const details = {secret: this._secret};
this._api.broadcastTab({action: 'frameEndpointReady', params: details});
}
/**
* @param {unknown} message
* @returns {boolean}
*/
authenticate(message) {
return (
this._token !== null &&
typeof message === 'object' && message !== null &&
this._token === /** @type {import('core').SerializableObject} */ (message).token &&
this._secret === /** @type {import('core').SerializableObject} */ (message).secret
);
}
/**
* @param {MessageEvent<unknown>} event
*/
_onMessage(event) {
if (this._token !== null) { return; } // Already initialized
const {data} = event;
if (typeof data !== 'object' || data === null) { return; } // Invalid message
const {action} = /** @type {import('core').SerializableObject} */ (data);
if (action !== 'frameEndpointConnect') { return; } // Invalid message
const {params} = /** @type {import('core').SerializableObject} */ (data);
if (typeof params !== 'object' || params === null) { return; } // Invalid data
const {secret} = /** @type {import('core').SerializableObject} */ (params);
if (secret !== this._secret) { return; } // Invalid authentication
const {token, hostFrameId} = /** @type {import('core').SerializableObject} */ (params);
if (typeof token !== 'string' || typeof hostFrameId !== 'number') { return; } // Invalid target
this._token = token;
this._eventListeners.removeAllEventListeners();
/** @type {import('frame-client').FrameEndpointConnectedDetails} */
const details = {secret, token};
this._api.sendMessageToFrame(hostFrameId, {action: 'frameEndpointConnected', params: details});
}
}
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