helpers.py 文件源码

def is_base64_encoded(sample):
   '''
   Check if a sample is likely base64-encoded

   sample - (string) The sample to evaluate
   '''
   base64chars = string.letters + string.digits + string.whitespace
   base64chars += '/+='
   # Turns out a lot of crazy things will b64-decode happily with
   # sample.decode('base64'). This is the fix.
   if any([char not in base64chars for char in sample]):
      return False
   try:
      sample.decode('base64')
      return True
   except:
      return False