/* * 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/>. */ class TemplateRendererFrameApi { constructor(templateRenderer) { this._templateRenderer = templateRenderer; this._windowMessageHandlers = new Map([ ['render', {async: true, handler: this._onRender.bind(this)}] ]); } prepare() { window.addEventListener('message', this._onWindowMessage.bind(this), false); } // Private _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 _onRender({template, data, type}) { return await this._templateRenderer.render(template, data, type); } _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 }; } }