import re
class Email(object):
    def __init__(self, w, b):
        self.whitelist = w
        self.blacklist = b
        
    def getWhitelistEmails(self):return self.whitelist
    def getBlacklistEmails(self):return self.blacklist
    
    def acceptOriginatorEmail(self, email, default_accept=True):
        """ return true if this email is either whitelisted or 
        not blacklisted """
        whitelist = self.getWhitelistEmails()
        blacklist = self.getBlacklistEmails()

        # note the order 
        for reject, emaillist in ([False, whitelist], [True, blacklist]):
            for okpattern in emaillist:
                if re.findall(okpattern.replace('*','\S+'), email, re.I):
                    # match!
                    if reject:
                        return False
                    else:
                        return True

        # default is to accept all
        return default_accept

e = Email(['*@foo.com', 'peter@peterbe.com'],
          ['spam@spam.com', 'annoying.*@peterbe.com']
          )
      
def T(*x):
    print "%s\t%s" % (x[0], e.acceptOriginatorEmail(*x))
T("Peter@Foo.com")
T("Peter@peterbe.com")
T("Peter @peterbe.com")
T("Peter @peterbe.com", True)
T("Peter @peterbe.com", False)
T("Spam@spamcom.com")
T("Spam@spam.com")
T("annoying@peterbe.com")
T("annoying.anybody@peterbe.com")

print "-"*20          

# now suppose you want to by default blacklist everything
# and only accept selected few
e = Email(['mail@peterbe.com'],
          ['*']
          )
def T(*x):
    print "%s\t%s" % (x[0], e.acceptOriginatorEmail(*x))
T("Peter@Foo.com")
T("Peter@peterbe.com")
T("Peter @peterbe.com")
T("Peter @peterbe.com", True)
T("Peter @peterbe.com", False)
T("Spam@spamcom.com")
T("Spam@spam.com")
T("annoying@peterbe.com")
T("annoying.anybody@peterbe.com")
T("mail@peterbe.com")