View age restricted videos on YouTube without verification and login :)
// ==UserScript==
// @name Simple YouTube Age Restriction Bypass
// @namespace https://zerody.one
// @version 0.7
// @description View age restricted videos on YouTube without verification and login :)
// @author ZerodyOne
// @match https://www.youtube.com/*
// @grant none
// @run-at document-start
// ==/UserScript==
(function() {
var nativeParse = window.JSON.parse; // Backup the original parse function
var nativeDefineProperty = getNativeDefineProperty(); // Backup the original defineProperty function to intercept setter & getter on the ytInitialPlayerResponse
var wrappedPlayerResponse = null;
var unlockablePlayerStates = ["AGE_VERIFICATION_REQUIRED", "LOGIN_REQUIRED"];
var responseCache = {};
// Just for compatibility: Backup original getter/setter for 'ytInitialPlayerResponse', defined by other extensions like AdBlock
var initialPlayerResponseDescriptor = window.Object.getOwnPropertyDescriptor(window, "ytInitialPlayerResponse");
var chainedSetter = initialPlayerResponseDescriptor ? initialPlayerResponseDescriptor.set : null;
var chainedGetter = initialPlayerResponseDescriptor ? initialPlayerResponseDescriptor.get : null;
// Just for compatibility: Intercept property (re-)definitions on 'ytInitialPlayerResponse' to chain setter/getter from other extensions by hijacking the Object.defineProperty function
window.Object.defineProperty = function(obj, prop, descriptor) {
if(obj === window && prop === "ytInitialPlayerResponse") {
console.info("Another extension tries to re-define 'ytInitialPlayerResponse' (probably an AdBlock extension). Chain it...");
if(descriptor && descriptor.set) chainedSetter = descriptor.set;
if(descriptor && descriptor.get) chainedGetter = descriptor.get;
} else {
nativeDefineProperty(obj, prop, descriptor);
}
}
// Re-define 'ytInitialPlayerResponse' to inspect and modify the initial player response as soon as the variable is set on page load
nativeDefineProperty(window, "ytInitialPlayerResponse", {
set: function(playerResponse) {
wrappedPlayerResponse = inspectJsonData(playerResponse);
if(typeof chainedSetter === "function") chainedSetter(wrappedPlayerResponse);
},
get: function() {
if(typeof chainedGetter === "function") try { return chainedGetter() } catch(err) { };
return wrappedPlayerResponse || {};
},
configurable: true
});
// Intercept, inspect and modify JSON-based communication to unlock player responses by hijacking the JSON.parse function
window.JSON.parse = function(text, reviver) {
return inspectJsonData(nativeParse(text, reviver));
}
function inspectJsonData(parsedData) {
try {
// Unlock #1: Array based in "&pbj=1" AJAX response on any navigation
if(Array.isArray(parsedData)) {
var playerResponseArrayItem = parsedData.find(e => typeof e.playerResponse === "object");
var playerResponse = playerResponseArrayItem ? playerResponseArrayItem.playerResponse : null;
if(playerResponse && isUnlockable(playerResponse.playabilityStatus)) {
playerResponseArrayItem.playerResponse = unlockPlayerResponse(playerResponse);
}
}
// Unlock #2: Another JSON-Object containing the 'playerResponse'
if(parsedData.playerResponse && parsedData.playerResponse.playabilityStatus && parsedData.playerResponse.videoDetails && isUnlockable(parsedData.playerResponse.playabilityStatus)) {
parsedData.playerResponse = unlockPlayerResponse(parsedData.playerResponse);
}
// Unlock #3: Initial page data structure and raw player response
if(parsedData.playabilityStatus && parsedData.videoDetails && isUnlockable(parsedData.playabilityStatus)) {
parsedData = unlockPlayerResponse(parsedData);
}
} catch(err) {
console.error("Simple-YouTube-Age-Restriction-Bypass-Error:", err);
}
return parsedData;
}
function isUnlockable(playabilityStatus) {
if(!playabilityStatus || !playabilityStatus.status) return false;
return unlockablePlayerStates.includes(playabilityStatus.status);
}
function unlockPlayerResponse(playerResponse) {
var videoId = playerResponse.videoDetails.videoId;
var unlockedPayerResponse = getUnlockedPlayerResponse(videoId);
// check if the unlocked response isn't playable
if(unlockedPayerResponse.playabilityStatus.status !== "OK")
throw ("Simple-YouTube-Age-Restriction-Bypass: Unlock Failed, playabilityStatus: " + unlockedPayerResponse.playabilityStatus.status);
return unlockedPayerResponse;
}
function getUnlockedPlayerResponse(videoId) {
// Check if is cached
if(responseCache.videoId === videoId) return responseCache.content;
// Query YT's unrestricted api endpoint
var xmlhttp = new XMLHttpRequest();
xmlhttp.open("GET", "/get_video_info?video_id=" + encodeURIComponent(videoId), false); // Synchronous!!!
xmlhttp.send(null);
var playerResponse = nativeParse(new URLSearchParams(xmlhttp.responseText).get("player_response"));
// If the video is age restricted and the uploader has disallowed the 'Allow embedding' option, these extra params can help in some cases...
if (playerResponse.playabilityStatus.status === "UNPLAYABLE") {
xmlhttp = new XMLHttpRequest();
xmlhttp.open("GET", "/get_video_info?video_id=" + encodeURIComponent(videoId) + "&html5=1&eurl&ps=desktop-polymer&el=adunit&cbr=Chrome&cplatform=DESKTOP&break_type=1&autoplay=1&content_v&authuser=0", false); // Synchronous!!!
xmlhttp.send(null);
playerResponse = nativeParse(new URLSearchParams(xmlhttp.responseText).get("player_response"));
}
// Cache response for 10 seconds
responseCache = { videoId: videoId, content: playerResponse };
setTimeout(function() { responseCache = {} }, 10000);
return playerResponse;
}
// Some extensions like AdBlock override the Object.defineProperty function to prevent a re-definition of the 'ytInitialPlayerResponse' variable by YouTube.
// But we need to define a custom descriptor to that variable to intercept his value. This behavior causes a race condition depending on the execution order with this script :(
// This function tries to restore the native Object.defineProperty function...
function getNativeDefineProperty() {
// Check if the Object.defineProperty function is native (original)
if(window.Object.defineProperty && window.Object.defineProperty.toString().indexOf("[native code]") > -1) {
return window.Object.defineProperty;
}
// if the Object.defineProperty function is already overidden, try to restore the native function from another window...
try {
if(!document.body) document.body = document.createElement("body");
var tempFrame = document.createElement("iframe");
tempFrame.style.display = "none";
document.body.insertAdjacentElement("beforeend", tempFrame);
var nativeDefineProperty = tempFrame.contentWindow.Object.defineProperty;
tempFrame.remove();
console.info("Simple-YouTube-Age-Restriction-Bypass: Overidden Object.defineProperty function successfully restored!");
return nativeDefineProperty;
} catch(err) {
console.warn("Simple-YouTube-Age-Restriction-Bypass: Unable to restore the original Object.defineProperty function", err);
return window.Object.defineProperty;
}
}
})();