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userausfall/djeveric/__init__.py

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from django.contrib.auth.tokens import default_token_generator
from django.contrib.contenttypes.models import ContentType
from django.contrib.sites.models import Site
from django.utils.encoding import force_bytes
from django.utils.http import urlsafe_base64_encode
from rest_framework.exceptions import PermissionDenied
def encode_pk(resource):
"""Encode the primary key of a resource with Base64 for usage in URLs."""
return urlsafe_base64_encode(force_bytes(resource.pk))
class AlreadyConfirmed(Exception):
"""The given resource has already been confirmed."""
pass
class Confirmation:
"""
Base class for handling a confirmation process.
"""
def __init__(self, user, resource):
self.user = user
self.resource = resource
def check(self):
if not self.has_permission(self.user, self.resource):
raise PermissionDenied()
if self.is_confirmed(self.resource):
raise AlreadyConfirmed()
self.confirm(self.resource)
def confirm(self, resource):
"""Overwrite this method to supply operations to confirm the resource."""
pass
def has_permission(self, user, resource) -> bool:
"""Overwrite this method returning if a user may confirm a resource."""
return False
def is_confirmed(self, resource) -> bool:
"""Overwrite this method to tell if a resource is confirmed."""
return False
def send_request(self):
if self.is_confirmed(self.resource):
return
site = Site.objects.get_current()
uid = encode_pk(self.user)
token = default_token_generator.make_token(self.user)
obj_type = ContentType.objects.get_for_model(self.resource)
type_id = encode_pk(obj_type)
obj_id = encode_pk(self.resource)
confirmation_url = (
f"https://{site.domain}/confirm/{uid}/{token}/{type_id}/{obj_id}"
)
self.user.email_user(
f"{site.name}: Bestätigung der Anfrage",
f"Bitte bestätige, dass du deine E-Mail-Adresse auf der Seite {site.name} ({site.domain}) eingegeben hast. "
f"Kopiere dazu folgende URL in deinen Webbrowser:\n\n{confirmation_url}",
)