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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/>.
*/
import {ClipboardReader} from '../comm/clipboard-reader.js';
import {invokeMessageHandler} from '../core.js';
import {yomitan} from '../yomitan.js';
/**
* This class controls the core logic of the extension, including API calls
* and various forms of communication between browser tabs and external applications.
*/
export 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([
['clipboardGetTextOffscreen', {async: true, contentScript: true, handler: this._getTextHandler.bind(this)}],
['clipboardGetImageOffscreen', {async: true, contentScript: true, handler: this._getImageHandler.bind(this)}]
]);
const onMessage = this._onMessage.bind(this);
chrome.runtime.onMessage.addListener(onMessage);
}
_getTextHandler({useRichText}) {
return this._clipboardReader.getText(useRichText);
}
_getImageHandler() {
return this._clipboardReader.getImage();
}
_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' && yomitan.isExtensionUrl(url)) { return; }
const {tab} = url;
if (typeof tab === 'object' && tab !== null) {
({url} = tab);
if (typeof url === 'string' && yomitan.isExtensionUrl(url)) { return; }
}
throw new Error('Invalid message sender');
}
}
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