def create_signup_code(self, commit=True):
email = self.cleaned_data["email"]
expiry = datetime.now() + timedelta(hours=1)
bits = [
settings.SECRET_KEY,
email,
str(expiry),
]
if self.group:
bits.append("%s%s" % (self.group._meta, self.group.pk))
code = sha_constructor("".join(bits)).hexdigest()
signup_code = SignupCode(code=code,
email=email,
max_uses=1,
expiry=expiry)
if commit:
signup_code.save()
return signup_code
