From 105b5ba58e113c54c030913159af05fc0553691d Mon Sep 17 00:00:00 2001
From: nicole trinity <nimble.embodiment.8@gmail.com>
Date: Thu, 1 Aug 2024 11:56:05 -0400
Subject: [PATCH] applied @dirkf's patches for nsig extraction on youtube

---
 test/test_youtube_signature.py  |  4 ++++
 youtube_dl/extractor/youtube.py | 19 ++++++++++++++-----
 2 files changed, 18 insertions(+), 5 deletions(-)

diff --git a/test/test_youtube_signature.py b/test/test_youtube_signature.py
index 5b4aa3aa0..5bb89710c 100644
--- a/test/test_youtube_signature.py
+++ b/test/test_youtube_signature.py
@@ -174,6 +174,10 @@ _NSIG_TESTS = [
         'https://www.youtube.com/s/player/5604538d/player_ias.vflset/en_US/base.js',
         '7X-he4jjvMx7BCX', 'sViSydX8IHtdWA',
     ),
+    (
+       'https://www.youtube.com/s/player/20dfca59/player_ias.vflset/en_US/base.js',
+       '-fLCxedkAk4LUTK2', 'O8kfRq1y1eyHGw',
+    ),
 ]
 
 
diff --git a/youtube_dl/extractor/youtube.py b/youtube_dl/extractor/youtube.py
index 84371ff06..390294966 100644
--- a/youtube_dl/extractor/youtube.py
+++ b/youtube_dl/extractor/youtube.py
@@ -1659,15 +1659,24 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
     def _extract_n_function_name(self, jscode):
         func_name, idx = self._search_regex(
             # new: (b=String.fromCharCode(110),c=a.get(b))&&c=nfunc[idx](c)
-            # or:  (b="nn"[+a.D],c=a.get(b))&&(c=nfunc[idx](c)s
+            # or:  (b="nn"[+a.D],c=a.get(b))&&(c=nfunc[idx](c)
+            # or:  (PL(a),b=a.j.n||null)&&(b=nfunc[idx](b)
             # old: .get("n"))&&(b=nfunc[idx](b)
             # older: .get("n"))&&(b=nfunc(b)
             r'''(?x)
-                (?:\(\s*(?P<b>[a-z])\s*=\s*(?:
+                (?:\((?:[\w$()\s]+,)*?\s*(?P<b>[a-z])\s*=\s*(?:
                     String\s*\.\s*fromCharCode\s*\(\s*110\s*\)|
-                    "n+"\[\s*\+?s*[\w$.]+\s*]
-                )\s*,(?P<c>[a-z])\s*=\s*[a-z]\s*)?
-                \.\s*get\s*\(\s*(?(b)(?P=b)|"n{1,2}")(?:\s*\)){2}\s*&&\s*\(\s*(?(c)(?P=c)|b)\s*=\s*
+                    "n+"\[\s*\+?s*[\w$.]+\s*]|
+                    (?P<b1>(?:[\w$]+\s*\.\s*)+n\b(?:(?!&&).)+\))
+                )\s*
+                    (?(b1)
+                          &&\s*\(\s*(?P=b)|
+                          (?:
+                              ,(?P<c>[a-z])\s*=\s*[a-z]\s*)?
+                              \.\s*get\s*\(\s*(?(b)(?P=b)|"n{1,2}")(?:\s*\)){2}\s*
+                              &&\s*\(\s*(?(c)(?P=c)|(?P=b))
+                          )
+                    )\s*=\s*                   
                 (?P<nfunc>[a-zA-Z_$][\w$]*)(?:\s*\[(?P<idx>\d+)\])?\s*\(\s*[\w$]+\s*\)
             ''', jscode, 'Initial JS player n function name', group=('nfunc', 'idx'))
         if not idx: