From 651a6a51c695c5819eb51ba2f98d0b64094315b9 Mon Sep 17 00:00:00 2001
From: Armend Hasani <armend.hasani926@gmail.com>
Date: Sat, 24 Jul 2021 15:20:20 +0200
Subject: [PATCH] get video info via post request using innertube api key

---
 XCDYouTubeKit/XCDYouTubeClient.h         |  3 ++
 XCDYouTubeKit/XCDYouTubeClient.m         | 11 +++++
 XCDYouTubeKit/XCDYouTubeVideoOperation.m | 55 +++++++++++++++++++++---
 3 files changed, 64 insertions(+), 5 deletions(-)

diff --git a/XCDYouTubeKit/XCDYouTubeClient.h b/XCDYouTubeKit/XCDYouTubeClient.h
index 573a97155..1fba33cab 100644
--- a/XCDYouTubeKit/XCDYouTubeClient.h
+++ b/XCDYouTubeKit/XCDYouTubeClient.h
@@ -25,6 +25,9 @@ NS_ASSUME_NONNULL_BEGIN
  */
 @interface XCDYouTubeClient : NSObject
 
++ (NSString *)innertubeApiKey;
++ (void)setInnertubeApiKey:(NSString *)key;
+
 /**
  *  ------------------
  *  @name Initializing
diff --git a/XCDYouTubeKit/XCDYouTubeClient.m b/XCDYouTubeKit/XCDYouTubeClient.m
index 5305d1aea..2ae8e2bd4 100644
--- a/XCDYouTubeKit/XCDYouTubeClient.m
+++ b/XCDYouTubeKit/XCDYouTubeClient.m
@@ -14,6 +14,8 @@ @implementation XCDYouTubeClient
 
 @synthesize languageIdentifier = _languageIdentifier;
 
+static NSString * _innertubeApiKey = @"AIzaSyAO_FJ2SlqU8Q4STEHLGCilw_Y9_11qcW8";
+
 + (instancetype) defaultClient
 {
 	static XCDYouTubeClient *defaultClient;
@@ -29,6 +31,15 @@ - (instancetype) init
 	return [self initWithLanguageIdentifier:nil];
 }
 
+
++ (NSString *)innertubeApiKey {
+	return _innertubeApiKey;
+}
+
++ (void)setInnertubeApiKey:(NSString *)key {
+	_innertubeApiKey = key;
+}
+
 - (instancetype) initWithLanguageIdentifier:(NSString *)languageIdentifier
 {
 	if (!(self = [super init]))
diff --git a/XCDYouTubeKit/XCDYouTubeVideoOperation.m b/XCDYouTubeKit/XCDYouTubeVideoOperation.m
index be4ce9ee1..b3d426488 100644
--- a/XCDYouTubeKit/XCDYouTubeVideoOperation.m
+++ b/XCDYouTubeKit/XCDYouTubeVideoOperation.m
@@ -12,6 +12,7 @@
 #import "XCDYouTubeDashManifestXML.h"
 #import "XCDYouTubePlayerScript.h"
 #import "XCDYouTubeLogger+Private.h"
+#import "XCDYouTubeClient.h"
 
 typedef NS_ENUM(NSUInteger, XCDYouTubeRequestType) {
 	XCDYouTubeRequestTypeGetVideoInfo = 1,
@@ -146,13 +147,24 @@ - (void) startNextRequest
 	}
 	else
 	{
-		NSString *eventLabel = [self.eventLabels objectAtIndex:0];
 		[self.eventLabels removeObjectAtIndex:0];
 		
-		NSDictionary *query = @{ @"video_id": self.videoIdentifier, @"hl": self.languageIdentifier, @"el": eventLabel, @"ps": @"default" };
-		NSString *queryString = XCDQueryStringWithDictionary(query);
-		NSURL *videoInfoURL = [NSURL URLWithString:[@"https://www.youtube.com/get_video_info?" stringByAppendingString:queryString]];
-		[self startRequestWithURL:videoInfoURL type:XCDYouTubeRequestTypeGetVideoInfo];
+		NSString *urlString = [NSString stringWithFormat:@"https://youtubei.googleapis.com/youtubei/v1/player?key=%@", XCDYouTubeClient.innertubeApiKey];
+		NSURL *url = [NSURL URLWithString:urlString];
+		
+		NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:10];
+		
+		[request setHTTPMethod:@"POST"];
+		
+		NSString *string = [NSString stringWithFormat:@"{'context': {'client': {'hl': 'en','clientName': 'WEB','clientVersion': '2.20210721.00.00','mainAppWebInfo': {'graftUrl': '/watch?v=%@'}}},'videoId': '%@'}", self.videoIdentifier, self.videoIdentifier];
+		
+		NSData *postData = [string dataUsingEncoding:NSASCIIStringEncoding];
+		
+		[request setHTTPBody:postData];
+		
+		[request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
+		
+		[self startRequestWith:request type:XCDYouTubeRequestTypeGetVideoInfo];
 	}
 }
 
@@ -206,6 +218,39 @@ - (void) startRequestWithURL:(NSURL *)url type:(XCDYouTubeRequestType)requestTyp
 	self.requestType = requestType;
 }
 
+- (void) startRequestWith:(NSMutableURLRequest *)request type:(XCDYouTubeRequestType)requestType
+{
+	if (self.isCancelled)
+		return;
+	
+	// Max (age-restricted VEVO) = 2×GetVideoInfo + 1×WatchPage + 2×EmbedPage + 1×JavaScriptPlayer + 1×GetVideoInfo + 1xDashManifest
+	if (++self.requestCount > 8)
+	{
+		// This condition should never happen but the request flow is quite complex so better abort here than go into an infinite loop of requests
+		[self finishWithError];
+		return;
+	}
+	
+	XCDYouTubeLogDebug(@"Starting request: %@", [request URL]);
+	
+	[request setValue:self.languageIdentifier forHTTPHeaderField:@"Accept-Language"];
+	[request setValue:[NSString stringWithFormat:@"https://youtube.com/watch?v=%@", self.videoIdentifier] forHTTPHeaderField:@"Referer"];
+	
+	self.dataTask = [self.session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error)
+	{
+		if (self.isCancelled)
+			return;
+		
+		if (error)
+			[self handleConnectionError:error requestType:requestType];
+		else
+			[self handleConnectionSuccessWithData:data response:response requestType:requestType];
+	}];
+	[self.dataTask resume];
+	
+	self.requestType = requestType;
+}
+
 #pragma mark - Response Dispatch
 
 - (void) handleConnectionSuccessWithData:(NSData *)data response:(NSURLResponse *)response requestType:(XCDYouTubeRequestType)requestType