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youtube-foreground.js
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youtube-foreground.js
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if (chrome) {
browser = chrome;
}
if (!window.scriptInjected) {
window.scriptInjected = true; //Prevents script from being run multiple times per tab
console.log("Script has been injected");
browser.runtime.sendMessage("Video loaded");
video = document.querySelector("video");
videoParent = video.parentElement;
/* Stores the Skip Ad button when available */
let skipAdTimer = 0;
skipAdInt = setInterval(getSkipButton, 500);
function getSkipButton() {
skipAdButton = document.querySelector(".ytp-ad-skip-button");
skipAdTimer++;
/* Continues to check for youtube ad to load for 15 seconds */
if (skipAdButton !== null || skipAdTimer > 30) {
clearInterval(skipAdInt);
skipAdTimer = 0;
}
}
/* ------------------------------ */
// Creates a MutationsObserver to monitor video DOM element
const observer = new MutationObserver((mutations) => {
// Mutations object used for debugging
browser.runtime.sendMessage(video.paused);
});
observer.observe(video, {
attributes: true,
});
// Creates another MutationsObserver to monitor when video reloads/changes
const observerReload = new MutationObserver((mutations) => {
// Restarts script if video 'src' changes
if (mutations[0].attributeName === "src") {
clearInterval(skipAdInt);
skipAdTimer = 0;
skipAdInt = setInterval(getSkipButton, 500);
}
});
observerReload.observe(video.parentElement, {
attributes: true,
characterData: true,
subtree: true,
attributeFilter: ["src"],
});
// Chrome lists Keyboard shortcuts in alphabetical order.
shortcuts = {
aPausePlay: new KeyboardEvent("keydown", { keyCode: 75 }),
bRewind: new KeyboardEvent("keydown", { keyCode: 37 }),
cFastforward: new KeyboardEvent("keydown", { keyCode: 39 }),
// dVolumeUp works by modifying a DOM element property
// eVolumeDown works by modifying a DOM element property
fNextVideo: new KeyboardEvent("keydown", { shiftKey: true, keyCode: 78 }),
// gPreviousVideo works by using the browser tabs API command. Check commandHandler() in background.js
// hLoopCurrentVideo works by modifying a DOM element property
iSpeedUp: new KeyboardEvent("keydown", { shiftKey: true, keyCode: 190 }),
jSlowDown: new KeyboardEvent("keydown", { shiftKey: true, keyCode: 188 }),
};
// All commands handled via the DOM
domElementCommands = {
dVolumeUp: () => {
if (video.volume < 0.9) {
video.volume = video.volume + 0.1;
} else {
video.volume = 1;
}
showInfoOverlay("volume");
},
eVolumeDown: () => {
if (video.volume > 0.1) {
video.volume = video.volume - 0.1;
} else {
video.volume = 0;
}
showInfoOverlay("volume");
},
hLoopCurrentVideo: () => {
if (!video.loop) {
video.loop = true;
} else {
video.loop = false;
}
showInfoOverlay("loop");
},
kSkipAd: () => {
try {
/* Only skips ad if "SkipAds" button is visible */
if (window.getComputedStyle(skipAdButton.parentElement, null).display === "none") return;
skipAdButton.click();
} catch (error) {
if (error.message.includes("parameter 1 is not of type 'Element'") || error.message.includes("Cannot read property 'parentElement' of null")) {
console.log("Attempted to skip, but no ad was found.");
} else {
console.log(error);
}
}
},
};
browser.runtime.onMessage.addListener((request, sender, sendResponse) => {
// Uses incoming message as a dynamic key to dispatch keypress or call command function
if (Object.keys(shortcuts).includes(request.message)) {
console.log("Command received: ", request.message);
document.dispatchEvent(shortcuts[request.message]);
}
if (Object.keys(domElementCommands).includes(request.message)) {
console.log("Command received: ", request.message);
domElementCommands[request.message]();
}
});
// Prevents background.js from running scripts on other windows when video is still playing in current window.
browser.runtime.onMessage.addListener((request, sender, sendResponse) => {
if (request.message === "Is your tab's video playing?") {
if (!video.paused) {
sendResponse("Yes, don't run a script on the other window yet.");
} else {
sendResponse("No, you can run a script on the other window.");
}
}
});
}
function showInfoOverlay(command) {
// Clears timeout so timeout for element staying on screen is restarted below
if (window.overlayTimeout != undefined) {
clearTimeout(window.overlayTimeout);
clearTimeout(fadeTimeout);
infoOverlay.classList.remove("fade");
textTop.innerHTML = "";
textBottom.innerHTML = "";
textBottom.classList.remove("show");
}
if (!window.infoOverlay) {
window.overlayTimeout = "temp"; // temporarily defines var
window.infoOverlay = document.createElement("div");
infoOverlay.className = "ytrInfoOverlay noclick";
textTop = document.createElement("p");
textBottom = document.createElement("p");
textTop.className = "ytrText ytrTextTop noclick";
textBottom.className = "ytrText ytrTextBottom noclick";
container = document.createElement("div");
container.className = "ytrInfoOverlayCont noclick";
}
// Set Inner Text of New Elements
switch (command) {
case "loop":
if (video.loop) {
textTop.innerText = "Video will now loop";
} else {
textTop.innerText = "Video will no longer loop";
}
break;
case "volume":
textTop.innerText = "Volume";
textBottom.innerText = video.volume.toFixed(1).toString();
textBottom.classList.add("show");
}
infoOverlay.appendChild(textTop);
infoOverlay.appendChild(textBottom);
container.appendChild(infoOverlay);
videoParent.appendChild(container);
// Element is removed
window.fadeTimeout = setTimeout(() => {
infoOverlay.classList.add("fade");
window.overlayTimeout = setTimeout(() => {
infoOverlay.remove();
}, 1050);
}, 2000);
}