_ 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     # 92 - vflQw-fB4 2013/07/17
   9     ("qwertyuioplkjhgfdsazxcvbnm1234567890QWERTYUIOPLKJHGFDSAZXCVBNM!@#$%^&*()_-+={[]}|:;?/>.<'`~\"",
  10      "mrtyuioplkjhgfdsazxcvbnq1234567890QWERTY}IOPLKJHGFDSAZXCVBNM!@#$%^&*()_-+={[]\"|:;"),
  11     # 88
  12     ("qwertyuioplkjhgfdsazxcvbnm1234567890QWERTYUIOPLKJHGFDSAZXCVBNM!@#$%^&*()_-+={[]}|:;?/>.<",
  13      "J:|}][{=+-_)(*&;%$#@>MNBVCXZASDFGH^KLPOIUYTREWQ0987654321mnbvcxzasdfghrklpoiuytej"),
  14     # 87
  15     ("qwertyuioplkjhgfdsazxcvbnm1234567890QWERTYUIOPLKJHGFDSAZXCVBNM!@#$^&*()_-+={[]}|:;?/>.<",
  16      "!?;:|}][{=+-_)(*&^$#@/MNBVCXZASqFGHJKLPOIUYTREWQ0987654321mnbvcxzasdfghjklpoiuytr"),
  17     # 86 - vfl_ymO4Z 2013/06/27
  18     ("qwertyuioplkjhgfdsazxcvbnm1234567890QWERTYUIOPLKJHGFDSAZXCVBNM!@#$%^&*()_-+={[|};?/>.<",
  19      "ertyuioplkjhgfdsazxcvbnm1234567890QWERTYUIOPLKJHGFDSAZXCVBNM!/#$%^&*()_-+={[|};?@"),
  20     # 85
  21     ("qwertyuioplkjhgfdsazxcvbnm1234567890QWERTYUIOPLKJHGFDSAZXCVBNM!@#$%^&*()_-+={[};?/>.<",
  22      "{>/?;}[.=+-_)(*&^%$#@!MqBVCXZASDFwHJKLPOIUYTREWQ0987654321mnbvcxzasdfghjklpoiuytr"),
  23     # 84
  24     ("qwertyuioplkjhgfdsazxcvbnm1234567890QWERTYUIOPLKJHGFDSAZXCVBNM!@#$%^&*()_-+={[};?>.<",
  25      "<.>?;}[{=+-_)(*&^%$#@!MNBVCXZASDFGHJKLPOIUYTREWe098765432rmnbvcxzasdfghjklpoiuyt1"),
  26     # 83 - vflcaqGO8 2013/07/11
  27     ("qwertyuioplkjhgfdsazxcvbnm1234567890QWERTYUIOPLKJHGFDSAZXCVBNM!#$%^&*()_+={[};?/>.<",
  28      "urty8ioplkjhgfdsazxcvbqm1234567S90QWERTYUIOPLKJHGFDnAZXCVBNM!#$%^&*()_+={[};?/>.<"),
  29     # 82
  30     ("qwertyuioplkjhgfdsazxcvbnm1234567890QWERTYUIOPLKHGFDSAZXCVBNM!@#$%^&*(-+={[};?/>.<",
  31      "Q>/?;}[{=+-(*<^%$#@!MNBVCXZASDFGHKLPOIUY8REWT0q&7654321mnbvcxzasdfghjklpoiuytrew9"),
  32     # 81
  33     ("qwertyuioplkjhgfdsazxcvbnm1234567890QWERTYUIOPLKHGFDSAZXCVBNM!@#$%^&*(-+={[};?/>.",
  34      "urty8ioplkjhgfdsazxcvbqm1234567e90QWERTYUIOPLKHGFDSnZXCVBNM!@#$%^&*(-+={[};?/>."),
  35 ]
  36
  37 def find_matching(wrong, right):
  38     idxs = [wrong.index(c) for c in right]
  39     return compress(idxs)
  40     return ('s[%d]' % i for i in idxs)
  41
  42 def compress(idxs):
  43     def _genslice(start, end, step):
  44         starts = '' if start == 0 else str(start)
  45         ends = ':%d' % (end+step)
  46         steps = '' if step == 1 else (':%d' % step)
  47         return 's[%s%s%s]' % (starts, ends, steps)
  48
  49     step = None
  50     for i, prev in zip(idxs[1:], idxs[:-1]):
  51         if step is not None:
  52             if i - prev == step:
  53                 continue
  54             yield _genslice(start, prev, step)
  55             step = None
  56             continue
  57         if i - prev in [-1, 1]:
  58             step = i - prev
  59             start = prev
  60             continue
  61         else:
  62             yield 's[%d]' % prev
  63     if step is None:
  64         yield 's[%d]' % i
  65     else:
  66         yield _genslice(start, i, step)
  67
  68 def _assert_compress(inp, exp):
  69     res = list(compress(inp))
  70     if res != exp:
  71         print('Got %r, expected %r' % (res, exp))
  72         assert res == exp
  73 _assert_compress([0,2,4,6], ['s[0]', 's[2]', 's[4]', 's[6]'])
  74 _assert_compress([0,1,2,4,6,7], ['s[:3]', 's[4]', 's[6:8]'])
  75 _assert_compress([8,0,1,2,4,7,6,9], ['s[8]', 's[:3]', 's[4]', 's[7:5:-1]', 's[9]'])
  76
  77 def gen(wrong, right, indent):
  78     code = ' + '.join(find_matching(wrong, right))
  79     return 'if len(s) == %d:\n%s    return %s\n' % (len(wrong), indent, code)
  80
  81 def genall(tests):
  82     indent = ' ' * 8
  83     return indent + (indent + 'el').join(gen(wrong, right, indent) for wrong,right in tests)
  84
  85 def main():
  86     print(genall(tests))
  87
  88 if __name__ == '__main__':
  89     main()