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-rw-r--r--ext/fg/js/frontend-api-receiver.js62
1 files changed, 62 insertions, 0 deletions
diff --git a/ext/fg/js/frontend-api-receiver.js b/ext/fg/js/frontend-api-receiver.js
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+++ b/ext/fg/js/frontend-api-receiver.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 FrontendApiReceiver {
+ constructor(source='', handlers={}) {
+ this.source = source;
+ this.handlers = handlers;
+
+ chrome.runtime.onConnect.addListener(this.onConnect.bind(this));
+ }
+
+ onConnect(port) {
+ if (port.name !== 'frontend-api-receiver') { return; }
+
+ port.onMessage.addListener(this.onMessage.bind(this, port));
+ }
+
+ onMessage(port, {id, action, params, target}) {
+ if (
+ target !== this.source ||
+ !this.handlers.hasOwnProperty(action)
+ ) {
+ return;
+ }
+
+ this.sendAck(port, id);
+
+ const handler = this.handlers[action];
+ handler(params).then(
+ result => {
+ this.sendResult(port, id, {result});
+ },
+ e => {
+ const error = typeof e.toString === 'function' ? e.toString() : e;
+ this.sendResult(port, id, {error});
+ });
+ }
+
+ sendAck(port, id) {
+ port.postMessage({type: 'ack', id});
+ }
+
+ sendResult(port, id, data) {
+ port.postMessage({type: 'result', id, data});
+ }
+}