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-rw-r--r--ext/js/comm/frame-endpoint.js65
1 files changed, 65 insertions, 0 deletions
diff --git a/ext/js/comm/frame-endpoint.js b/ext/js/comm/frame-endpoint.js
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+++ b/ext/js/comm/frame-endpoint.js
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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});
+ }
+}