Add Authenticate API endpoint / Add CustomUser models

React will use this authenticate api endpoint

backend/assets/accounts/auth.css

@@ -0,0 +1,4 @@
+* {
+    outline: 1px red solid;
+  }
+  

backend/core/settings.py

@@ -10,6 +10,7 @@ For the full list of settings and their values, see
 https://docs.djangoproject.com/en/4.2/ref/settings/
 """
 
+import os
 from pathlib import Path
 from decouple import config, Csv
 
@@ -31,7 +32,12 @@ ALLOWED_HOSTS = config('ALLOWED_HOSTS', default='*', cast=Csv())
 
 # Application definition
 
-SITE_ID = 2
+SITE_ID = 3
+
+AUTHENTICATION_BACKENDS = (
+    'django.contrib.auth.backends.ModelBackend',
+    'allauth.account.auth_backends.AuthenticationBackend',
+)
 
 INSTALLED_APPS = [
     'django.contrib.admin',
@@ -40,25 +46,52 @@ INSTALLED_APPS = [
     'django.contrib.sessions',
     'django.contrib.messages',
     'django.contrib.staticfiles',
+    
     'users',
+    'rest_framework',
+    'corsheaders',
+
     'django.contrib.sites',
     'allauth',
     'allauth.account',
     'allauth.socialaccount',
     'allauth.socialaccount.providers.google',
+
+    'dj_rest_auth',
+    'dj_rest_auth.registration',
+    'rest_framework.authtoken',
 ]
 
+REST_FRAMEWORK = {
+    'DEFAULT_PERMISSION_CLASSES': [
+        'rest_framework.permissions.IsAuthenticated',
+        
+    ],
+    'DEFAULT_AUTHENTICATION_CLASSES': [
+        'rest_framework_simplejwt.authentication.JWTAuthentication',
+        'dj_rest_auth.jwt_auth.JWTCookieAuthentication',
+    ]
+}
+
+REST_USE_JWT = True
+
 SOCIALACCOUNT_PROVIDERS = {
-    'google' : {
-        'SCOPE' : [
-            'profile',
-            'email',
-        ],
-        'AUTH_PARAMS' : {'access_type' : 'online'}
+    'google': {
+        'APP': {
+            'client_id': config('GOOGLE_CLIENT_ID'),
+            'secret': config('GOOGLE_CLIENT_SECRET'),
+            'key': ''
+        }
     }
 }
 
+CORS_ALLOWED_ORIGINS = [
+    "http://localhost:8000",
+    "http://127.0.0.1:8000"
+]
+
 MIDDLEWARE = [
+    'corsheaders.middleware.CorsMiddleware',
     'django.middleware.security.SecurityMiddleware',
     'django.contrib.sessions.middleware.SessionMiddleware',
     'django.middleware.common.CommonMiddleware',
@@ -74,7 +107,9 @@ ROOT_URLCONF = 'core.urls'
 TEMPLATES = [
     {
         'BACKEND': 'django.template.backends.django.DjangoTemplates',
-        'DIRS': [],
+        'DIRS': [
+            os.path.join(BASE_DIR, 'templates')
+        ],
         'APP_DIRS': True,
         'OPTIONS': {
             'context_processors': [
@@ -146,10 +181,13 @@ STATIC_URL = 'static/'
 
 DEFAULT_AUTO_FIELD = 'django.db.models.BigAutoField'
 
-AUTHENTICATION_BACKENDS = (
-    'django.contrib.auth.backends.ModelBackend',
-    'allauth.account.auth_backends.AuthenticationBackend',
-)
+
+SOCIAL_AUTH_GOOGLE_OAUTH2_SCOPE = [
+    'https://www.googleapis.com/auth/userinfo.email',
+    'https://www.googleapis.com/auth/userinfo.profile',
+]
 
 LOGIN_REDIRECT_URL = '/'
 LOGOUT_REDIRECT_URL = '/'
+
+AUTH_USER_MODEL = "users.CustomUser"

backend/core/urls.py

@@ -19,6 +19,6 @@ from django.urls import path, include
 
 urlpatterns = [
     path('admin/', admin.site.urls),
+    path('api/', include('users.urls')),
     path('accounts/', include('allauth.urls')),
-    path('', include('users.urls')),
 ]

backend/sample.env

@@ -6,3 +6,5 @@ DB_USER=your_DB_USER
 DB_PASSWORD=your_DB_PASSWORD
 DB_HOST=your_DB_HOST
 DB_PORT=your_DB_PORT
+GOOGLE_CLIENT_ID=your_GOOGLE_CLIENT_ID
+GOOGLE_CLIENT_SECRET=your_GOOGLE_CLIENT_SECRET

backend/users/admin.py

@@ -1,3 +1,32 @@
 from django.contrib import admin
+from users.models import CustomUser
+from django.contrib.auth.admin import UserAdmin
+from django.forms import Textarea
+from django.db import models
 
-# Register your models here.
+class UserAdminConfig(UserAdmin):
+    model = CustomUser
+
+    search_fields = ('email', 'username', 'first_name',)
+    list_filter = ('email', 'username', 'first_name', 'is_active', 'is_staff')
+    ordering = ('-start_date',)
+    list_display = ('email', 'username', 'first_name', 'is_active', 'is_staff')
+    fieldsets = (
+        (None, {'fields': ('email', 'username', 'first_name',)}),
+        ('Permissions', {'fields': ('is_staff', 'is_active')}),
+        ('Personal', {'fields': ('about',)}),
+    )
+
+    # Formfield overrides for 'about' field
+    formfield_overrides = {
+        models.TextField: {'widget': Textarea(attrs={'rows': 20, 'cols': 60})},
+    }
+
+    add_fieldsets = (
+        (None, {
+            'classes': ('wide',),
+            'fields': ('email', 'username', 'first_name', 'password1', 'password2', 'is_active', 'is_staff')
+        }),
+    )
+
+admin.site.register(CustomUser, UserAdminConfig)

backend/users/managers.py

@@ -0,0 +1,31 @@
+from django.utils.translation import gettext_lazy as _
+from django.contrib.auth.models import BaseUserManager
+
+class CustomAccountManager(BaseUserManager):
+    def create_superuser(self, email, username, first_name, password, **other_fields):
+        """
+        Create a superuser with the given email, username, first_name, and password.
+        """
+        other_fields.setdefault('is_staff', True)
+        other_fields.setdefault('is_superuser', True)
+        other_fields.setdefault('is_active', True)
+
+        if other_fields.get('is_staff') is not True:
+            raise ValueError('Superuser must be assigned to is_staff=True.')
+        if other_fields.get('is_superuser') is not True:
+            raise ValueError('Superuser must be assigned to is_superuser=True.')
+
+        return self.create_user(email, username, first_name, password, **other_fields)
+
+    def create_user(self, email, username, first_name, password, **other_fields):
+        """
+        Create a user with the given email, username, first_name, and password.
+        """
+        if not email:
+            raise ValueError(_('You must provide an email address'))
+
+        email = self.normalize_email(email)
+        user = self.model(email=email, username=username, first_name=first_name, **other_fields)
+        user.set_password(password)
+        user.save()
+        return user

backend/users/migrations/0001_initial.py

@@ -0,0 +1,37 @@
+# Generated by Django 4.2.6 on 2023-10-27 13:09
+
+from django.db import migrations, models
+import django.utils.timezone
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+        ('auth', '0012_alter_user_first_name_max_length'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='CustomUser',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('password', models.CharField(max_length=128, verbose_name='password')),
+                ('last_login', models.DateTimeField(blank=True, null=True, verbose_name='last login')),
+                ('is_superuser', models.BooleanField(default=False, help_text='Designates that this user has all permissions without explicitly assigning them.', verbose_name='superuser status')),
+                ('email', models.EmailField(max_length=254, unique=True, verbose_name='email address')),
+                ('username', models.CharField(max_length=150, unique=True)),
+                ('first_name', models.CharField(blank=True, max_length=150)),
+                ('start_date', models.DateTimeField(default=django.utils.timezone.now)),
+                ('about', models.TextField(blank=True, max_length=500, verbose_name='about')),
+                ('is_staff', models.BooleanField(default=False)),
+                ('is_active', models.BooleanField(default=True)),
+                ('groups', models.ManyToManyField(blank=True, help_text='The groups this user belongs to. A user will get all permissions granted to each of their groups.', related_name='user_set', related_query_name='user', to='auth.group', verbose_name='groups')),
+                ('user_permissions', models.ManyToManyField(blank=True, help_text='Specific permissions for this user.', related_name='user_set', related_query_name='user', to='auth.permission', verbose_name='user permissions')),
+            ],
+            options={
+                'abstract': False,
+            },
+        ),
+    ]

backend/users/models.py

@@ -1,3 +1,28 @@
 from django.db import models
+from django.utils import timezone
+from django.utils.translation import gettext_lazy as _
+from django.contrib.auth.models import AbstractBaseUser, PermissionsMixin
 
-# Create your models here.
+from .managers import CustomAccountManager
+
+
+class CustomUser(AbstractBaseUser, PermissionsMixin):
+    # User fields
+    email = models.EmailField(_('email address'), unique=True)
+    username = models.CharField(max_length=150, unique=True)
+    first_name = models.CharField(max_length=150, blank=True)
+    start_date = models.DateTimeField(default=timezone.now)
+    about = models.TextField(_('about'), max_length=500, blank=True)
+    is_staff = models.BooleanField(default=False)
+    is_active = models.BooleanField(default=True)
+
+    # Custom manager
+    objects = CustomAccountManager()
+
+    # Fields for authentication
+    USERNAME_FIELD = 'email'
+    REQUIRED_FIELDS = ['username', 'first_name']
+
+    def __str__(self):
+        # String representation of the user
+        return self.username

backend/users/serializers.py

@@ -0,0 +1,39 @@
+from rest_framework_simplejwt.serializers import TokenObtainPairSerializer
+from rest_framework import serializers
+from .models import CustomUser
+
+
+class MyTokenObtainPairSerializer(TokenObtainPairSerializer):
+    @classmethod
+    def get_token(cls, user):
+        """
+        Get the token for the user and add custom claims, such as 'username'.
+        """
+        token = super(MyTokenObtainPairSerializer, cls).get_token(user)
+        token['username'] = user.username
+        return token
+
+
+class CustomUserSerializer(serializers.ModelSerializer):
+    """
+    Serializer for CustomUser model.
+    """
+    email = serializers.EmailField(required=True)
+    username = serializers.CharField(required=True)
+    password = serializers.CharField(min_length=8, write_only=True)
+
+    class Meta:
+        model = CustomUser
+        fields = ('email', 'username', 'password')
+        extra_kwargs = {'password': {'write_only': True}}
+
+    def create(self, validated_data):
+        """
+        Create a CustomUser instance with validated data, including password hashing.
+        """
+        password = validated_data.pop('password', None)
+        instance = self.Meta.model(**validated_data)
+        if password is not None:
+            instance.set_password(password)
+        instance.save()
+        return instance

backend/users/templates/users/home.html

@@ -1,14 +0,0 @@
-<!DOCTYPE html>
-<html lang="en">
-<head>
-    <meta charsets="UTF-8"/>
-    <meta http-equiv="X-UA-compatible" content="IE=edge"/>
-    <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
-    <title>Django Google Sign In</title>
-</head>
-<body>
-    {% load socialaccount %}
-    <h2>Google Login</h2>
-    <a href='{% provider_login_url 'google' %}?next=/'>Login With Google</a>
-</body>
-</html>

backend/users/urls.py

@@ -1,7 +1,12 @@
 from django.urls import path
-from . import views
+from rest_framework_simplejwt import views as jwt_views
+from .views import ObtainTokenPairWithCustomView, CustomUserCreate, GreetingView, GoogleLogin
 
 urlpatterns = [
-    path('', views.home),
-    path('logout', views.logout_view),
+    path('user/create/', CustomUserCreate.as_view(), name="create_user"),
+    path('token/obtain/', jwt_views.TokenObtainPairView.as_view(), name='token_create'),
+    path('token/refresh/', jwt_views.TokenRefreshView.as_view(), name='token_refresh'),
+    path('token/custom_obtain/', ObtainTokenPairWithCustomView.as_view(), name='token_create_custom'),
+    path('hello/', GreetingView.as_view(), name='hello_world'),
+    path('dj-rest-auth/google/', GoogleLogin.as_view(), name="google_login"),
 ]

backend/users/views.py

@@ -1,10 +1,78 @@
-from django.shortcuts import render, redirect
-from django.contrib.auth import logout
+"""This module defines API views for authentication, user creation, and a simple hello message."""
 
-def home(request):
-    return render(request, 'users/home.html')
+from django.shortcuts import render
+from rest_framework import status
+from rest_framework.permissions import IsAuthenticated, AllowAny
+from rest_framework.response import Response
+from rest_framework.views import APIView
+from allauth.socialaccount.providers.google.views import GoogleOAuth2Adapter
+from dj_rest_auth.registration.views import SocialLoginView
+from .serializers import MyTokenObtainPairSerializer, CustomUserSerializer
 
 
-def logout_view(request):
-    logout(request)
-    return redirect('/')
+class ObtainTokenPairWithCustomView(APIView):
+    """
+    Custom Token Obtain Pair View.
+    Allows users to obtain access and refresh tokens by providing credentials.
+    """
+    permission_classes = (AllowAny,)
+
+    def post(self, request):
+        """
+        Issue access and refresh tokens in response to a valid login request.
+        """
+        serializer = MyTokenObtainPairSerializer(data=request.data)
+        if serializer.is_valid():
+            token = serializer.validated_data
+            return Response(token, status=status.HTTP_200_OK)
+        return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)
+
+
+class CustomUserCreate(APIView):
+    """
+    Custom User Creation View.
+    Allows users to create new accounts.
+    """
+    permission_classes = (AllowAny,)
+
+    def post(self, request):
+        """
+        Create a new user account based on the provided data.
+        """
+        serializer = CustomUserSerializer(data=request.data)
+        if serializer.is_valid():
+            user = serializer.save()
+            if user:
+                return Response(serializer.data, status=status.HTTP_201_CREATED)
+        return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)
+
+
+class GreetingView(APIView):
+    """
+    Hello World View.
+    Returns a greeting and user information for authenticated users.
+    """
+    permission_classes = (IsAuthenticated,)
+
+    def get(self, request):
+        """
+        Retrieve a greeting message and user information.
+        """
+        user = request.user
+        user_info = {
+            "username": user.username,
+        }
+        response_data = {
+            "message": "Hello, world!",
+            "user_info": user_info,
+        }
+        return Response(response_data, status=status.HTTP_200_OK)
+
+
+class GoogleLogin(SocialLoginView):
+    """
+    Google Login View.
+    Handles Google OAuth2 authentication.
+    """
+    permission_classes = (AllowAny,)
+    adapter_class = GoogleOAuth2Adapter