_ Git - youtube-dl/blob - devscripts/youtube_genalgo.py

   1 #!/usr/bin/env python
   2
   3 # Generate youtube signature algorithm from test cases
   4
   5 import sys
   6
   7 tests = [
   8     # 88
   9     ("qwertyuioplkjhgfdsazxcvbnm1234567890QWERTYUIOPLKJHGFDSAZXCVBNM!@#$%^&*()_-+={[]}|:;?/>.<",
  10      "J:|}][{=+-_)(*&;%$#@>MNBVCXZASDFGH^KLPOIUYTREWQ0987654321mnbvcxzasdfghrklpoiuytej"),
  11     # 87
  12     ("qwertyuioplkjhgfdsazxcvbnm1234567890QWERTYUIOPLKJHGFDSAZXCVBNM!@#$^&*()_-+={[]}|:;?/>.<",
  13      "!?;:|}][{=+-_)(*&^$#@/MNBVCXZASqFGHJKLPOIUYTREWQ0987654321mnbvcxzasdfghjklpoiuytr"),
  14     # 86 - vfl_ymO4Z 2013/06/27
  15     ("qwertyuioplkjhgfdsazxcvbnm1234567890QWERTYUIOPLKJHGFDSAZXCVBNM!@#$%^&*()_-+={[|};?/>.<",
  16      "ertyuioplkjhgfdsazxcvbnm1234567890QWERTYUIOPLKJHGFDSAZXCVBNM!/#$%^&*()_-+={[|};?@"),
  17     # 85
  18     ("qwertyuioplkjhgfdsazxcvbnm1234567890QWERTYUIOPLKJHGFDSAZXCVBNM!@#$%^&*()_-+={[};?/>.<",
  19      "{>/?;}[.=+-_)(*&^%$#@!MqBVCXZASDFwHJKLPOIUYTREWQ0987654321mnbvcxzasdfghjklpoiuytr"),
  20     # 84
  21     ("qwertyuioplkjhgfdsazxcvbnm1234567890QWERTYUIOPLKJHGFDSAZXCVBNM!@#$%^&*()_-+={[};?>.<",
  22      "<.>?;}[{=+-_)(*&^%$#@!MNBVCXZASDFGHJKLPOIUYTREWe098765432rmnbvcxzasdfghjklpoiuyt1"),
  23     # 83 - vflcaqGO8 2013/07/11
  24     ("qwertyuioplkjhgfdsazxcvbnm1234567890QWERTYUIOPLKJHGFDSAZXCVBNM!#$%^&*()_+={[};?/>.<",
  25      "urty8ioplkjhgfdsazxcvbqm1234567S90QWERTYUIOPLKJHGFDnAZXCVBNM!#$%^&*()_+={[};?/>.<"),
  26     # 82
  27     ("qwertyuioplkjhgfdsazxcvbnm1234567890QWERTYUIOPLKHGFDSAZXCVBNM!@#$%^&*(-+={[};?/>.<",
  28      "Q>/?;}[{=+-(*<^%$#@!MNBVCXZASDFGHKLPOIUY8REWT0q&7654321mnbvcxzasdfghjklpoiuytrew9"),
  29     # 81
  30     ("qwertyuioplkjhgfdsazxcvbnm1234567890QWERTYUIOPLKHGFDSAZXCVBNM!@#$%^&*(-+={[};?/>.",
  31      "urty8ioplkjhgfdsazxcvbqm1234567e90QWERTYUIOPLKHGFDSnZXCVBNM!@#$%^&*(-+={[};?/>."),
  32 ]
  33
  34 def find_matching(wrong, right):
  35     idxs = [wrong.index(c) for c in right]
  36     return compress(idxs)
  37     return ('s[%d]' % i for i in idxs)
  38
  39 def compress(idxs):
  40     def _genslice(start, end, step):
  41         starts = '' if start == 0 else str(start)
  42         ends = ':%d' % (end+step)
  43         steps = '' if step == 1 else (':%d' % step)
  44         return 's[%s%s%s]' % (starts, ends, steps)
  45
  46     step = None
  47     for i, prev in zip(idxs[1:], idxs[:-1]):
  48         if step is not None:
  49             if i - prev == step:
  50                 continue
  51             yield _genslice(start, prev, step)
  52             step = None
  53             continue
  54         if i - prev in [-1, 1]:
  55             step = i - prev
  56             start = prev
  57             continue
  58         else:
  59             yield 's[%d]' % prev
  60     if step is None:
  61         yield 's[%d]' % i
  62     else:
  63         yield _genslice(start, i, step)
  64
  65 def _assert_compress(inp, exp):
  66     res = list(compress(inp))
  67     if res != exp:
  68         print('Got %r, expected %r' % (res, exp))
  69         assert res == exp
  70 _assert_compress([0,2,4,6], ['s[0]', 's[2]', 's[4]', 's[6]'])
  71 _assert_compress([0,1,2,4,6,7], ['s[:3]', 's[4]', 's[6:8]'])
  72 _assert_compress([8,0,1,2,4,7,6,9], ['s[8]', 's[:3]', 's[4]', 's[7:5:-1]', 's[9]'])
  73
  74 def gen(wrong, right, indent):
  75     code = ' + '.join(find_matching(wrong, right))
  76     return 'if len(s) == %d:\n%s    return %s\n' % (len(wrong), indent, code)
  77
  78 def genall(tests):
  79     indent = ' ' * 8
  80     return indent + (indent + 'el').join(gen(wrong, right, indent) for wrong,right in tests)
  81
  82 def main():
  83     print(genall(tests))
  84
  85 if __name__ == '__main__':
  86     main()