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background.js
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background.js
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/*
* Copy This Block
* Copyright (C) 2018 Katsuhiro Ueno
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
'use strict';
function init() {
chrome.contextMenus.create({
id: 'copy-this-block',
title: chrome.i18n.getMessage('Copy_This_Block'),
contexts: ['selection']
});
}
chrome.runtime.onStartup.addListener(init);
chrome.runtime.onInstalled.addListener(init);
function copyThisBlock(info, tab) {
function start() {
var origins = [];
if (!tab.active && info.pageUrl) origins.push(info.pageUrl);
if (info.frameId && info.frameUrl) origins.push(info.frameUrl);
if (origins.length === 0)
executeScript(k => { k(); });
else {
// request additional permission if the target is in a frame
var perm = {origins: origins};
chrome.permissions.request(perm, granted => {
if (chrome.runtime.lastError || !granted)
fail(chrome.runtime.lastError);
else
executeScript(k => { chrome.permissions.remove(perm, k); });
});
}
}
function executeScript(removePermission) {
var args = {file: '/content.js'};
if (info.frameId) args.frameId = info.frameId;
// inject the content script on demand in order to reduce memory usage.
chrome.tabs.executeScript(tab.id, args, result => {
var error = chrome.runtime.lastError;
removePermission(() => {
if (error || chrome.runtime.lastError || !result || !result[0])
fail(error || chrome.runtime.lastError);
});
});
}
function fail(error) {
if (info.selectionText) {
// if an error occurred, perform the same as a normal copy command
var t = document.createElement('textarea');
t.value = info.selectionText;
document.body.appendChild(t);
t.select();
document.execCommand('copy');
document.body.removeChild(t);
}
if (error)
if (Error.isPrototypeOf(error)) throw error;
else throw Error(error.message);
}
if (!info) info = {};
if (!tab) fail(null);
else start();
}
chrome.contextMenus.onClicked.addListener(copyThisBlock);
chrome.commands.onCommand.addListener(() => {
chrome.tabs.query({active: true, currentWindow: true}, tabs => {
// FIXME: info is missing and therefore it cannot copy anything
// in a frame and cannot fall back to normal copy command when it fails.
// There seems no way in the WebExtensions API to obtain them from a
// onCommand listener, whereas onClicked listners receive them.
if (tabs[0]) copyThisBlock(null, tabs[0]);
});
});