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import base64
class Base64Converter:
regex = r'[a-zA-Z0-9+/]*={0,2}'
def to_python(self, value):
return base64.b64decode(value)
def to_url(self, value):
return base64.b64encode(value).decode('ascii')
class DynamicConverter:
_dynamic_to_python = None
_dynamic_to_url = None
@property
def regex(self):
return r'[0-9a-zA-Z]+'
@regex.setter
def regex(self):
raise Exception("You can't modify the regular expression.")
def to_python(self, value):
return type(self)._dynamic_to_python(value)
def to_url(self, value):
return type(self)._dynamic_to_url(value)
@classmethod
def register_to_python(cls, value):
cls._dynamic_to_python = value
@classmethod
def register_to_url(cls, value):
cls._dynamic_to_url = value
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