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-rw-r--r--ext/bg/js/backend-api-forwarder.js45
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diff --git a/ext/bg/js/backend-api-forwarder.js b/ext/bg/js/backend-api-forwarder.js
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+++ b/ext/bg/js/backend-api-forwarder.js
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+/*
+ * Copyright (C) 2019 Alex Yatskov <alex@foosoft.net>
+ * Author: Alex Yatskov <alex@foosoft.net>
+ *
+ * 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 <http://www.gnu.org/licenses/>.
+ */
+
+
+class BackendApiForwarder {
+ constructor() {
+ chrome.runtime.onConnect.addListener(this.onConnect.bind(this));
+ }
+
+ onConnect(port) {
+ if (port.name !== 'backend-api-forwarder') { return; }
+
+ let tabId;
+ if (!(
+ port.sender &&
+ port.sender.tab &&
+ (typeof (tabId = port.sender.tab.id)) === 'number'
+ )) {
+ port.disconnect();
+ return;
+ }
+
+ const forwardPort = chrome.tabs.connect(tabId, {name: 'frontend-api-receiver'});
+
+ port.onMessage.addListener(message => forwardPort.postMessage(message));
+ forwardPort.onMessage.addListener(message => port.postMessage(message));
+ port.onDisconnect.addListener(() => forwardPort.disconnect());
+ forwardPort.onDisconnect.addListener(() => port.disconnect());
+ }
+}