completed authentication serializers

authentication/admin.py

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+from django.contrib import admin
+
+# Register your models here.

authentication/apps.py

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+from django.apps import AppConfig
+
+
+class AuthenticationConfig(AppConfig):
+    default_auto_field = "django.db.models.BigAutoField"
+    name = "authentication"

authentication/backends.py

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+import jwt
+from django.conf import settings
+from django.contrib.auth.models import User
+from rest_framework import authentication, exceptions
+
+
+class JWTAuthentication(authentication.BaseAuthentication):
+    def authenticate(self, request):
+
+        auth_data = authentication.get_authorization_header(request)
+
+        if not auth_data:
+            return None
+
+        prefix, token = auth_data.decode("utf-8").split(" ")
+
+        try:
+            payload = jwt.decode(token, settings.JWT_SECRET_KEY, algorithms="HS256")
+            user = User.objects.get(username=payload["username"])
+            return (user, token)
+        except jwt.DecodeError as err:
+            raise exceptions.AuthenticationFailed("Your token is invalid, please login")
+        except jwt.ExpiredSignatureError as err:
+            raise exceptions.AuthenticationFailed("Your token is expired, login")
+
+        return super().authenticate(request)

authentication/models.py

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+from django.db import models
+
+# Create your models here.

authentication/serializers.py

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+from django.contrib.auth.models import User
+from rest_framework import serializers
+
+
+class UserSerializer(serializers.ModelSerializer):
+    password = serializers.CharField(max_length=65, min_length=8, write_only=True)
+    email = serializers.EmailField(max_length=255)
+    first_name = serializers.CharField(max_length=255)
+    last_name = serializers.CharField(max_length=255)
+
+    class Meta:
+        model = User
+        fields = ["username", "first_name", "last_name", "email", "password"]
+
+    def validate(self, attrs):
+
+        email = attrs.get("email", "")
+        if User.objects.filter(email=email).exists():
+            raise serializers.ValidationError({"error": "Email is already in use"})
+        return super().validate(attrs)
+
+    def create(self, validated_data):
+        return User.objects.create_user(**validated_data)
+
+
+class LoginSerializer(serializers.ModelSerializer):
+    password = serializers.CharField(max_length=65)
+    username = serializers.CharField(max_length=255)
+
+    class Meta:
+        model = User
+        fields = ["username", "password"]

authentication/tests.py

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+from django.test import TestCase
+
+# Create your tests here.

authentication/views.py

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+from django.shortcuts import render
+
+# Create your views here.