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diff --git a/ext/bg/js/template-renderer-frame-api.js b/ext/bg/js/template-renderer-frame-api.js
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+/*
+ * Copyright (C) 2020 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/>.
+ */
+
+class TemplateRendererFrameApi {
+ constructor(templateRenderer) {
+ this._templateRenderer = templateRenderer;
+ this._windowMessageHandlers = new Map([
+ ['renderHandlebarsTemplate', {async: true, handler: this._onRenderHandlebarsTemplate.bind(this)}]
+ ]);
+ }
+
+ prepare() {
+ window.addEventListener('message', this._onWindowMessage.bind(this), false);
+ }
+
+ _onWindowMessage(e) {
+ const {source, data: {action, params, id}} = e;
+ const messageHandler = this._windowMessageHandlers.get(action);
+ if (typeof messageHandler === 'undefined') { return; }
+
+ this._onWindowMessageInner(messageHandler, action, params, source, id);
+ }
+
+ async _onWindowMessageInner({handler, async}, action, params, source, id) {
+ let response;
+ try {
+ let result = handler(params);
+ if (async) {
+ result = await result;
+ }
+ response = {result};
+ } catch (error) {
+ response = {error: this._errorToJson(error)};
+ }
+
+ if (typeof id === undefined) { return; }
+ source.postMessage({action: `${action}.response`, params: response, id}, '*');
+ }
+
+ async _onRenderHandlebarsTemplate({template, data, marker}) {
+ return await this._templateRenderer.render(template, data, marker);
+ }
+
+ _errorToJson(error) {
+ try {
+ if (error !== null && typeof error === 'object') {
+ return {
+ name: error.name,
+ message: error.message,
+ stack: error.stack,
+ data: error.data
+ };
+ }
+ } catch (e) {
+ // NOP
+ }
+ return {
+ value: error,
+ hasValue: true
+ };
+ }
+}