Password field for Schematics

password_maybe.py

>>> from schematics.models import Model
>>> from schematics.serialize import whitelist, blacklist
>>> from schematics.types import BaseType, StringType
>>> from schematics.exceptions import ValidationError
>>> import hashlib
>>> import random
>>> 
>>> class PasswordType(BaseType):
...     ALGORITHM = 'MD5'
...     def __init__(self, **kw):
...         super(PasswordType, self).__init__(self, **kw)
...     def convert(self, value):
...         (password, salt) = value
...         pass_string = self.gen_secret(password, salt)
...         return pass_string
...     def to_primitive(self, value):
...         return str(value)
...     def gen_secret(self, password, salt=None):
...         if salt == None:
...             salt = self.gen_salt()
...         digest = self.gen_digest(password, salt)
...         secret_string = ':::'.join([self.ALGORITHM, digest, salt])
...         return secret_string
...     def gen_digest(self, password, salt):
...         return hashlib.md5(salt + password).hexdigest()
...     def gen_salt(self):
...         alphabet = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
...         alphanum = alphabet + "0123456789"
...         salt = ''.join(random.choice(alphanum) for i in range(16))
...         return salt
... 
>>> class User(Model):
...     secret = PasswordType()
...     name = StringType(required=True, max_length=50)
...     bio = StringType(max_length=100)
...     class Options:
...         roles = {
...             'owner': blacklist(),
...             'public': whitelist('name', 'bio'),
...         }
... 
>>> 
>>> u = User()
>>> u.secret = ('whatevz', None)
>>> 
>>> u.secret
'MD5:::0abff363012d1e934ecc509df62be1ff:::YFfnk5kzsb2uRA9f'
>>>