browser-extension/extension/script.js

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JavaScript
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/*
content script running on youtube.com
*/
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'use strict';
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const downloadIcon = `<svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
viewBox="0 0 500 500" style="enable-background:new 0 0 500 500;" xml:space="preserve">
<style type="text/css">
.st0{display:none;}
.st1{display:inline;}
</style>
<g class="st0">
<g class="st1">
<g>
<rect x="49.8" y="437.8" width="400.4" height="32.4"/>
</g>
<g>
<g>
<path d="M49.8,193c2-9.4,7.6-16.4,14.5-22.6c2.9-2.6,5.5-5.5,8.3-8.3c13.1-12.9,31.6-13,44.6,0c23,22.9,45.9,45.9,68.8,68.8
c0.7,0.7,1.5,1.4,2.5,2.4c1.1-1.1,2.2-2.1,3.3-3.1c63.4-63.4,126.8-126.8,190.2-190.2c10.7-10.7,24.6-13.3,37.1-6.7
c2.9,1.6,5.6,3.8,8.1,6c4.2,3.9,8.2,8.1,12.2,12.1c14.3,14.3,14.3,32.4,0.1,46.6c-20.2,20.3-40.5,40.5-60.8,60.8
C321,216.8,263.2,274.6,205.4,332.4c-11.2,11.2-22.4,11.2-33.6,0c-35.7-35.7-71.4-71.6-107.3-107.2
c-6.7-6.6-12.7-13.4-14.8-22.8C49.8,199.2,49.8,196.1,49.8,193z"/>
</g>
</g>
</g>
</g>
<g>
<rect x="237.9" y="313.5" transform="matrix(-1.836970e-16 1 -1 -1.836970e-16 708.0891 208.8956)" width="23.4" height="289.9"/>
<g>
<g>
<path d="M190.6,195.1c-21.7,0-42.5,0.1-63.4,0c-8.2,0-14.4,3-17.8,10.6c-3.5,7.9-1.3,14.6,4.5,20.7
c40.6,42.4,81,84.9,121.6,127.3c8.9,9.3,19.1,9.4,28,0.1c40.7-42.5,81.3-85.1,122-127.7c5.6-5.9,7.6-12.6,4.3-20.3
c-3.3-7.6-9.5-10.8-17.7-10.7c-19,0.1-38,0-57,0c-2,0-3.9,0-6.5,0c0-2.8,0-5,0-7.1c0-42.3,0.1-84.5,0-126.8
c0-19.4-12.1-31.3-31.5-31.4c-17.9-0.1-35.8,0-53.7,0c-21.2,0-32.7,11.6-32.7,32.9c0,41.7,0,83.4,0,125.1
C190.6,190,190.6,192.2,190.6,195.1z"/>
<path d="M190.6,195.1c0-2.9,0-5.1,0-7.3c0-41.7,0-83.4,0-125.1c0-21.3,11.5-32.9,32.7-32.9c17.9,0,35.8-0.1,53.7,0
c19.4,0.1,31.5,12,31.5,31.4c0.1,42.3,0,84.5,0,126.8c0,2.2,0,4.4,0,7.1c2.5,0,4.5,0,6.5,0c19,0,38,0.1,57,0
c8.2,0,14.4,3.1,17.7,10.7c3.4,7.6,1.3,14.4-4.3,20.3c-40.7,42.6-81.3,85.2-122,127.7c-8.8,9.2-19.1,9.2-28-0.1
c-40.5-42.4-81-84.9-121.6-127.3c-5.8-6.1-8-12.8-4.5-20.7c3.4-7.6,9.6-10.7,17.8-10.6C148.1,195.2,168.9,195.1,190.6,195.1z"/>
</g>
</g>
</g>
</svg>`;
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const checkmarkIcon = `<svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
viewBox="0 0 500 500" style="enable-background:new 0 0 500 500;" xml:space="preserve">
<style type="text/css">
.st0{display:none;}
.st1{display:inline;}
</style>
<g>
<g>
<g>
<rect x="49.8" y="437.8" width="400.4" height="32.4"/>
</g>
<g>
<g>
<path d="M49.8,193c2-9.4,7.6-16.4,14.5-22.6c2.9-2.6,5.5-5.5,8.3-8.3c13.1-12.9,31.6-13,44.6,0c23,22.9,45.9,45.9,68.8,68.8
c0.7,0.7,1.5,1.4,2.5,2.4c1.1-1.1,2.2-2.1,3.3-3.1c63.4-63.4,126.8-126.8,190.2-190.2c10.7-10.7,24.6-13.3,37.1-6.7
c2.9,1.6,5.6,3.8,8.1,6c4.2,3.9,8.2,8.1,12.2,12.1c14.3,14.3,14.3,32.4,0.1,46.6c-20.2,20.3-40.5,40.5-60.8,60.8
C321,216.8,263.2,274.6,205.4,332.4c-11.2,11.2-22.4,11.2-33.6,0c-35.7-35.7-71.4-71.6-107.3-107.2
c-6.7-6.6-12.7-13.4-14.8-22.8C49.8,199.2,49.8,196.1,49.8,193z"/>
</g>
</g>
</g>
</g>
<g class="st0">
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<rect x="237.9" y="313.5" transform="matrix(-1.836970e-16 1 -1 -1.836970e-16 708.0891 208.8956)" class="st1" width="23.4" height="289.9"/>
<g class="st1">
<g>
<path d="M190.6,195.1c-21.7,0-42.5,0.1-63.4,0c-8.2,0-14.4,3-17.8,10.6c-3.5,7.9-1.3,14.6,4.5,20.7
c40.6,42.4,81,84.9,121.6,127.3c8.9,9.3,19.1,9.4,28,0.1c40.7-42.5,81.3-85.1,122-127.7c5.6-5.9,7.6-12.6,4.3-20.3
c-3.3-7.6-9.5-10.8-17.7-10.7c-19,0.1-38,0-57,0c-2,0-3.9,0-6.5,0c0-2.8,0-5,0-7.1c0-42.3,0.1-84.5,0-126.8
c0-19.4-12.1-31.3-31.5-31.4c-17.9-0.1-35.8,0-53.7,0c-21.2,0-32.7,11.6-32.7,32.9c0,41.7,0,83.4,0,125.1
C190.6,190,190.6,192.2,190.6,195.1z"/>
<path d="M190.6,195.1c0-2.9,0-5.1,0-7.3c0-41.7,0-83.4,0-125.1c0-21.3,11.5-32.9,32.7-32.9c17.9,0,35.8-0.1,53.7,0
c19.4,0.1,31.5,12,31.5,31.4c0.1,42.3,0,84.5,0,126.8c0,2.2,0,4.4,0,7.1c2.5,0,4.5,0,6.5,0c19,0,38,0.1,57,0
c8.2,0,14.4,3.1,17.7,10.7c3.4,7.6,1.3,14.4-4.3,20.3c-40.7,42.6-81.3,85.2-122,127.7c-8.8,9.2-19.1,9.2-28-0.1
c-40.5-42.4-81-84.9-121.6-127.3c-5.8-6.1-8-12.8-4.5-20.7c3.4-7.6,9.6-10.7,17.8-10.6C148.1,195.2,168.9,195.1,190.6,195.1z"/>
</g>
</g>
</g>
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</svg>`;
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const defaultIcon = `<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><title>minus-thick</title><path d="M20 14H4V10H20" /></svg>`;
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let browserType = getBrowser();
// boilerplate to dedect browser type api
function getBrowser() {
if (typeof chrome !== 'undefined') {
if (typeof browser !== 'undefined') {
console.log('detected firefox');
return browser;
} else {
console.log('detected chrome');
return chrome;
}
} else {
console.log('failed to dedect browser');
throw 'browser detection error';
}
}
function getChannelContainers() {
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const elements = document.querySelectorAll('.yt-flexible-actions-view-model-wiz, #owner');
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const channelContainerNodes = [];
elements.forEach(element => {
if (isElementVisible(element)) {
channelContainerNodes.push(element);
}
});
return channelContainerNodes;
}
function isElementVisible(element) {
return element.offsetWidth > 0 || element.offsetHeight > 0 || element.getClientRects().length > 0;
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}
function ensureTALinks() {
let channelContainerNodes = getChannelContainers();
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for (let channelContainer of channelContainerNodes) {
channelContainer = adjustOwner(channelContainer);
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if (channelContainer.hasTA) continue;
let channelButton = buildChannelButton(channelContainer);
channelContainer.appendChild(channelButton);
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channelContainer.hasTA = true;
}
let titleContainerNodes = getTitleContainers();
for (let titleContainer of titleContainerNodes) {
let parent = getNearestH3(titleContainer);
if (!parent) continue;
if (parent.hasTA) continue;
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let videoButton = buildVideoButton(titleContainer);
if (videoButton == null) continue;
processTitle(parent);
parent.appendChild(videoButton);
parent.hasTA = true;
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}
}
ensureTALinks = throttled(ensureTALinks, 700);
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function adjustOwner(channelContainer) {
return channelContainer.querySelector('#buttons') || channelContainer;
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}
function buildChannelButton(channelContainer) {
let channelHandle = getChannelHandle(channelContainer);
channelContainer.taDerivedHandle = channelHandle;
let buttonDiv = buildChannelButtonDiv();
let channelSubButton = buildChannelSubButton(channelHandle);
buttonDiv.appendChild(channelSubButton);
channelContainer.taSubButton = channelSubButton;
let spacer = buildSpacer();
buttonDiv.appendChild(spacer);
let channelDownloadButton = buildChannelDownloadButton();
buttonDiv.appendChild(channelDownloadButton);
channelContainer.taDownloadButton = channelDownloadButton;
if (!channelContainer.taObserver) {
function updateButtonsIfNecessary() {
let newHandle = getChannelHandle(channelContainer);
if (channelContainer.taDerivedHandle === newHandle) return;
console.log(`updating handle from ${channelContainer.taDerivedHandle} to ${newHandle}`);
channelContainer.taDerivedHandle = newHandle;
let channelSubButton = buildChannelSubButton(newHandle);
channelContainer.taSubButton.replaceWith(channelSubButton);
channelContainer.taSubButton = channelSubButton;
let channelDownloadButton = buildChannelDownloadButton();
channelContainer.taDownloadButton.replaceWith(channelDownloadButton);
channelContainer.taDownloadButton = channelDownloadButton;
}
channelContainer.taObserver = new MutationObserver(throttled(updateButtonsIfNecessary, 100));
channelContainer.taObserver.observe(channelContainer, {
attributes: true,
childList: true,
subtree: true,
});
}
return buttonDiv;
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}
function getChannelHandle(channelContainer) {
let channelHandle;
const videoOwnerRenderer = channelContainer.querySelector('.ytd-video-owner-renderer');
if (!videoOwnerRenderer) {
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const channelHandleContainer = document.querySelector(
'.yt-content-metadata-view-model-wiz__metadata-text'
);
channelHandle = channelHandleContainer ? channelHandleContainer.innerText : null;
} else {
const href = videoOwnerRenderer.href;
if (href) {
const urlObj = new URL(href);
channelHandle = urlObj.pathname.split('/')[1];
}
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}
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return channelHandle;
}
function buildChannelButtonDiv() {
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let buttonDiv = document.createElement('div');
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buttonDiv.classList.add('ta-channel-button');
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Object.assign(buttonDiv.style, {
display: 'flex',
alignItems: 'center',
backgroundColor: '#00202f',
color: '#fff',
fontSize: '14px',
padding: '5px',
'margin-left': '8px',
borderRadius: '18px',
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});
return buttonDiv;
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}
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function buildChannelSubButton(channelHandle) {
let channelSubButton = document.createElement('span');
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channelSubButton.innerText = 'Checking...';
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channelSubButton.title = `TA Subscribe: ${channelHandle}`;
channelSubButton.setAttribute('data-id', channelHandle);
channelSubButton.setAttribute('data-type', 'channel');
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channelSubButton.addEventListener('click', e => {
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e.preventDefault();
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if (channelSubButton.innerText === 'Subscribe') {
console.log(`subscribe to: ${channelHandle}`);
sendUrl(channelHandle, 'subscribe', channelSubButton);
} else if (channelSubButton.innerText === 'Unsubscribe') {
console.log(`unsubscribe from: ${channelHandle}`);
sendUrl(channelHandle, 'unsubscribe', channelSubButton);
} else {
console.log('Unknown state');
}
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});
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Object.assign(channelSubButton.style, {
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padding: '5px',
cursor: 'pointer',
});
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checkChannelSubscribed(channelSubButton);
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return channelSubButton;
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}
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function checkChannelSubscribed(channelSubButton) {
function handleResponse(message) {
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if (!message || (typeof message === 'object' && message.channel_subscribed === false)) {
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channelSubButton.innerText = 'Subscribe';
} else if (typeof message === 'object' && message.channel_subscribed === true) {
channelSubButton.innerText = 'Unsubscribe';
} else {
console.log('Unknown state');
}
}
function handleError(e) {
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buttonError(channelSubButton);
channelSubButton.innerText = 'Error';
console.error('error', e);
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}
let channelHandle = channelSubButton.dataset.id;
let message = { type: 'getChannel', channelHandle };
let sending = sendMessage(message);
sending.then(handleResponse, handleError);
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}
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function buildSpacer() {
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let spacer = document.createElement('span');
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spacer.innerText = '|';
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return spacer;
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}
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function buildChannelDownloadButton() {
let channelDownloadButton = document.createElement('span');
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let currentLocation = window.location.href;
let urlObj = new URL(currentLocation);
if (urlObj.pathname.startsWith('/watch')) {
let params = new URLSearchParams(document.location.search);
let videoId = params.get('v');
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channelDownloadButton.setAttribute('data-type', 'video');
channelDownloadButton.setAttribute('data-id', videoId);
channelDownloadButton.title = `TA download video: ${videoId}`;
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checkVideoExists(channelDownloadButton);
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} else {
channelDownloadButton.setAttribute('data-id', currentLocation);
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channelDownloadButton.setAttribute('data-type', 'channel');
channelDownloadButton.title = `TA download channel ${currentLocation}`;
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}
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channelDownloadButton.innerHTML = downloadIcon;
channelDownloadButton.addEventListener('click', e => {
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e.preventDefault();
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console.log(`download: ${currentLocation}`);
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sendDownload(channelDownloadButton);
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});
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Object.assign(channelDownloadButton.style, {
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filter: 'invert()',
width: '20px',
padding: '0 5px',
cursor: 'pointer',
});
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return channelDownloadButton;
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}
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function getTitleContainers() {
let elements = document.querySelectorAll('#video-title');
let videoNodes = [];
elements.forEach(element => {
if (isElementVisible(element)) {
videoNodes.push(element);
}
});
return elements;
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}
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function getVideoId(titleContainer) {
if (!titleContainer) return undefined;
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let href = getNearestLink(titleContainer);
if (!href) return;
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let videoId;
if (href.startsWith('/watch?v')) {
let params = new URLSearchParams(href);
videoId = params.get('/watch?v');
} else if (href.startsWith('/shorts/')) {
videoId = href.split('/')[2];
}
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return videoId;
}
function buildVideoButton(titleContainer) {
let videoId = getVideoId(titleContainer);
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if (!videoId) return;
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const dlButton = document.createElement('a');
dlButton.classList.add('ta-button');
dlButton.href = '#';
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Object.assign(dlButton.style, {
display: 'flex',
alignItems: 'center',
justifyContent: 'center',
backgroundColor: '#00202f',
color: '#fff',
fontSize: '1.4rem',
textDecoration: 'none',
borderRadius: '8px',
cursor: 'pointer',
height: 'fit-content',
opacity: 0,
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});
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let dlIcon = document.createElement('span');
dlIcon.innerHTML = defaultIcon;
Object.assign(dlIcon.style, {
filter: 'invert()',
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width: '15px',
height: '15px',
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padding: '7px 8px',
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});
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dlButton.appendChild(dlIcon);
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dlButton.addEventListener('click', e => {
e.preventDefault();
sendDownload(dlButton);
e.stopPropagation();
});
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return dlButton;
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}
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function getNearestLink(element) {
// Check siblings
let sibling = element;
while (sibling) {
sibling = sibling.previousElementSibling;
if (sibling && sibling.tagName === 'A' && sibling.getAttribute('href') !== '#') {
return sibling.getAttribute('href');
}
}
sibling = element;
while (sibling) {
sibling = sibling.nextElementSibling;
if (sibling && sibling.tagName === 'A' && sibling.getAttribute('href') !== '#') {
return sibling.getAttribute('href');
}
}
// Check parent elements
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for (let i = 0; i < 5 && element && element !== document; i++) {
if (element.tagName === 'A' && element.getAttribute('href') !== '#') {
return element.getAttribute('href');
}
element = element.parentNode;
}
return null;
}
function getNearestH3(element) {
for (let i = 0; i < 5 && element && element !== document; i++) {
if (element.tagName === 'H3') {
return element;
}
element = element.parentNode;
}
return null;
}
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function processTitle(titleContainer) {
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if (titleContainer.hasListener) return;
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Object.assign(titleContainer.style, {
display: 'flex',
gap: '15px',
});
titleContainer.classList.add('title-container');
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titleContainer.addEventListener('mouseenter', () => {
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const taButton = titleContainer.querySelector('.ta-button');
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if (!taButton) return;
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if (!taButton.isChecked) checkVideoExists(taButton);
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taButton.style.opacity = 1;
});
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titleContainer.addEventListener('mouseleave', () => {
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const taButton = titleContainer.querySelector('.ta-button');
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if (!taButton) return;
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taButton.style.opacity = 0;
});
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titleContainer.hasListener = true;
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}
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function checkVideoExists(taButton) {
function handleResponse(message) {
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let buttonSpan = taButton.querySelector('span') || taButton;
if (message !== false) {
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buttonSpan.innerHTML = checkmarkIcon;
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buttonSpan.title = 'Open in TA';
buttonSpan.addEventListener('click', () => {
let win = window.open(message, '_blank');
win.focus();
});
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} else {
buttonSpan.innerHTML = downloadIcon;
}
taButton.isChecked = true;
}
function handleError(e) {
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buttonError(taButton);
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let videoId = taButton.dataset.id;
console.log(`error: failed to get info from TA for video ${videoId}`);
console.error(e);
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}
let videoId = taButton.dataset.id;
if (!videoId) {
videoId = getVideoId(taButton);
if (videoId) {
taButton.setAttribute('data-id', videoId);
taButton.setAttribute('data-type', 'video');
taButton.title = `TA download video: ${taButton.parentElement.innerText} [${videoId}]`;
}
}
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let message = { type: 'videoExists', videoId };
let sending = sendMessage(message);
sending.then(handleResponse, handleError);
}
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function sendDownload(button) {
let url = button.dataset.id;
if (!url) return;
sendUrl(url, 'download', button);
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}
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function buttonError(button) {
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let buttonSpan = button.querySelector('span');
if (buttonSpan === null) {
buttonSpan = button;
}
buttonSpan.style.filter =
'invert(19%) sepia(93%) saturate(7472%) hue-rotate(359deg) brightness(105%) contrast(113%)';
buttonSpan.style.color = 'red';
button.style.opacity = 1;
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button.addEventListener('mouseout', () => {
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Object.assign(button.style, {
opacity: 1,
});
});
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}
function buttonSuccess(button) {
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let buttonSpan = button.querySelector('span');
if (buttonSpan === null) {
buttonSpan = button;
}
if (buttonSpan.innerHTML === 'Subscribe') {
buttonSpan.innerHTML = 'Success';
setTimeout(() => {
buttonSpan.innerHTML = 'Unsubscribe';
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}, 2000);
} else {
buttonSpan.innerHTML = checkmarkIcon;
}
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}
function sendUrl(url, action, button) {
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function handleResponse(message) {
console.log('sendUrl response: ' + JSON.stringify(message));
if (message === null || message.detail === 'Invalid token.') {
buttonError(button);
} else {
buttonSuccess(button);
}
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}
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function handleError(e) {
console.log('error', e);
buttonError(button);
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}
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let message = { type: action, url };
console.log('youtube link: ' + JSON.stringify(message));
let sending = sendMessage(message);
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sending.then(handleResponse, handleError);
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}
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async function sendMessage(message) {
let { success, value } = await browserType.runtime.sendMessage(message);
if (!success) {
throw value;
}
return value;
}
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function cleanButtons() {
console.log('trigger clean buttons');
document.querySelectorAll('.ta-button').forEach(button => {
button.parentElement.hasTA = false;
button.remove();
});
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document.querySelectorAll('.ta-channel-button').forEach(button => {
button.parentElement.hasTA = false;
button.remove();
});
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}
let oldHref = document.location.href;
function throttled(callback, time) {
let throttleBlock = false;
let lastArgs;
return (...args) => {
lastArgs = args;
if (throttleBlock) return;
throttleBlock = true;
setTimeout(() => {
throttleBlock = false;
callback(...lastArgs);
}, time);
};
}
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let observer = new MutationObserver(list => {
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const currentHref = document.location.href;
if (currentHref !== oldHref) {
cleanButtons();
oldHref = currentHref;
}
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if (list.some(i => i.type === 'childList' && i.addedNodes.length > 0)) {
ensureTALinks();
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}
});
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observer.observe(document.body, { attributes: false, childList: true, subtree: true });