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diff --git a/ext/js/offscreen/offscreen.js b/ext/js/offscreen/offscreen.js
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+/*
+ * Copyright (C) 2023 Yomitan Authors
+ * Copyright (C) 2016-2022 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
+ * ClipboardReader
+ * Environment
+ */
+
+/**
+ * This class controls the core logic of the extension, including API calls
+ * and various forms of communication between browser tabs and external applications.
+ */
+class Offscreen {
+ /**
+ * Creates a new instance.
+ */
+ constructor() {
+ this._clipboardReader = new ClipboardReader({
+ // eslint-disable-next-line no-undef
+ document: (typeof document === 'object' && document !== null ? document : null),
+ pasteTargetSelector: '#clipboard-paste-target',
+ richContentPasteTargetSelector: '#clipboard-rich-content-paste-target'
+ });
+
+ this._messageHandlers = new Map([
+ ['clipboardGetOffscreen', {async: true, contentScript: true, handler: this._getTextHandler.bind(this)}]
+ ]);
+
+ const onMessage = this._onMessage.bind(this);
+ chrome.runtime.onMessage.addListener(onMessage);
+ }
+
+ _getTextHandler({useRichText}) {
+ return this._clipboardReader.getText(useRichText);
+ }
+
+ _onMessage({action, params}, sender, callback) {
+ const messageHandler = this._messageHandlers.get(action);
+ if (typeof messageHandler === 'undefined') { return false; }
+ this._validatePrivilegedMessageSender(sender);
+
+ return invokeMessageHandler(messageHandler, params, callback, sender);
+ }
+
+ _validatePrivilegedMessageSender(sender) {
+ let {url} = sender;
+ if (typeof url === 'string' && yomichan.isExtensionUrl(url)) { return; }
+ const {tab} = url;
+ if (typeof tab === 'object' && tab !== null) {
+ ({url} = tab);
+ if (typeof url === 'string' && yomichan.isExtensionUrl(url)) { return; }
+ }
+ throw new Error('Invalid message sender');
+ }
+}