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[jsinterp] Fix division (#7279)

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* Fixes nsig decryption for Youtube JS player `8c7583ff`

Authored by: bashonly
This commit is contained in:
bashonly 2023-06-10 17:49:12 -05:00 committed by GitHub
parent 4f7b11cc1c
commit b4a252fba8
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GPG key ID: 4AEE18F83AFDEB23
3 changed files with 12 additions and 1 deletions
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7
test/test_jsinterp.py
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@ -28,6 +28,13 @@ class TestJSInterpreter(unittest.TestCase):
def test_calc(self): def test_calc(self):
self._test('function f(a){return 2*a+1;}', 7, args=[3]) self._test('function f(a){return 2*a+1;}', 7, args=[3])
def test_div(self):
jsi = JSInterpreter('function f(a, b){return a / b;}')
self.assertTrue(math.isnan(jsi.call_function('f', 0, 0)))
self.assertTrue(math.isnan(jsi.call_function('f', JS_Undefined, 1)))
self.assertTrue(math.isinf(jsi.call_function('f', 2, 0)))
self.assertEqual(jsi.call_function('f', 0, 3), 0)
def test_empty_return(self): def test_empty_return(self):
self._test('function f(){return; y()}', None) self._test('function f(){return; y()}', None)

4
test/test_youtube_signature.py
View file

@ -150,6 +150,10 @@ _NSIG_TESTS = [
'https://www.youtube.com/s/player/cfa9e7cb/player_ias.vflset/en_US/base.js', 'https://www.youtube.com/s/player/cfa9e7cb/player_ias.vflset/en_US/base.js',
'aCi3iElgd2kq0bxVbQ', 'QX1y8jGb2IbZ0w', 'aCi3iElgd2kq0bxVbQ', 'QX1y8jGb2IbZ0w',
), ),
(
'https://www.youtube.com/s/player/8c7583ff/player_ias.vflset/en_US/base.js',
'1wWCVpRR96eAmMI87L', 'KSkWAVv1ZQxC3A',
),
] ]

2
yt_dlp/jsinterp.py
View file

@ -44,7 +44,7 @@ def _js_arith_op(op):
def _js_div(a, b): def _js_div(a, b):
if JS_Undefined in (a, b) or not (a and b): if JS_Undefined in (a, b) or not (a or b):
return float('nan') return float('nan')
return (a or 0) / b if b else float('inf') return (a or 0) / b if b else float('inf')