Python: What is Django REST Framework authentication?

1from rest_framework.authentication import (
2    TokenAuthentication,
3    SessionAuthentication,
4    BaseAuthentication
5)
6from rest_framework.permissions import IsAuthenticated
7
8# Token Authentication
9class UserViewSet(viewsets.ModelViewSet):
10    queryset = User.objects.all()
11    serializer_class = UserSerializer
12    authentication_classes = [TokenAuthentication]
13    permission_classes = [IsAuthenticated]
14
15# Custom Authentication
16class APIKeyAuthentication(BaseAuthentication):
17    def authenticate(self, request):
18        api_key = request.META.get("HTTP_X_API_KEY")
19        if not api_key:
20            return None
21
22        try:
23            user = User.objects.get(api_key=api_key)
24        except User.DoesNotExist:
25            raise AuthenticationFailed("Invalid API key")
26
27        return (user, api_key)
28
29# settings.py
30REST_FRAMEWORK = {
31    "DEFAULT_AUTHENTICATION_CLASSES": [
32        "rest_framework.authentication.TokenAuthentication",
33        "rest_framework.authentication.SessionAuthentication",
34    ],
35    "DEFAULT_PERMISSION_CLASSES": [
36        "rest_framework.permissions.IsAuthenticated",
37    ],
38}