To implement a phone number verification system with Django REST Framework (DRF), you can follow the following steps. This system will allow users to provide their phone number, receive a verification code by SMS (for example via Twilio), and validate this code to verify their number.

Main Steps:

1. Install necessary dependencies
2. Edit user template to include phone number
3. Create a template to store verification codes
4. Configure an SMS sending service (e.g. Twilio)
5. Create DRF serializers
6. Create views and API routes
7. Manage verification logic and security

1. Install Necessary Dependencies

First, make sure you have installed the necessary libraries:

• Django REST Framework: If you haven't already.
• Twilio: For sending SMS.
• django-phonenumber-field: For validating and formatting phone numbers.

Install them via pip:

pip install djangorestframework twilio django-phonenumber-field

Add phonenumber_field and rest_framework to your INSTALLED_APPS in settings.py:

# settings.py

INSTALLED_APPS = [
    # ...
    'rest_framework',
    'phonenumber_field',
    # ...
]

2. Change User Template to Include Phone Number

If you are using a custom user template, add a field for the phone number and a verification flag.

# models.py

from django.contrib.auth.models import AbstractBaseUser, BaseUserManager
from django.db import models
from phonenumber_field.modelfields import PhoneNumberField

class UserManager(BaseUserManager):
    def create_user(self, email, username, phone_number, password=None):
        if not email:
            raise ValueError('Les utilisateurs doivent avoir une adresse email')
        if not phone_number:
            raise ValueError('Les utilisateurs doivent avoir un numéro de téléphone')

        user = self.model(
            email=self.normalize_email(email),
            username=username,
            phone_number=phone_number,
        )

        user.set_password(password)
        user.save(using=self._db)
        return user

    def create_superuser(self, email, username, phone_number, password=None):
        user = self.create_user(
            email,
            username,
            phone_number,
            password=password,
        )
        user.is_admin = True
        user.save(using=self._db)
        return user

class CustomUser(AbstractBaseUser):
    email = models.EmailField(verbose_name='adresse email', max_length=255, unique=True)
    username = models.CharField(max_length=50, unique=True)
    phone_number = PhoneNumberField(unique=True, null=False, blank=False)
    is_active = models.BooleanField(default=True)
    is_admin = models.BooleanField(default=False)
    is_phone_verified = models.BooleanField(default=False)

    objects = UserManager()

    USERNAME_FIELD = 'email'
    REQUIRED_FIELDS = ['username', 'phone_number']

    def __str__(self):
        return self.email

    @property
    def is_staff(self):
        return self.is_admin

Note: If you already have a user model, be sure to add the phone_number and is_phone_verified fields appropriately.

3. Create a Template to Store Verification Codes

This template will store verification codes sent to users.

# models.py

import random
import string
from django.utils import timezone
from datetime import timedelta

class PhoneVerification(models.Model):
    user = models.ForeignKey(CustomUser, on_delete=models.CASCADE, related_name='phone_verifications')
    code = models.CharField(max_length=6)
    created_at = models.DateTimeField(auto_now_add=True)
    is_verified = models.BooleanField(default=False)

    def is_expired(self):
        return self.created_at < timezone.now() - timedelta(minutes=10)  # Expire après 10 minutes

    def __str__(self):
        return f"Vérification de {self.user.email} - {'Validé' if self.is_verified else 'En attente'}"

4. Configure an SMS Sending Service (Ex. Twilio)

You can use Twilio to send text messages. Start by creating a Twilio account and obtaining the necessary credentials (ACCOUNT_SID, AUTH_TOKEN, FROM_NUMBER).

Add these configurations to your settings.py:

# settings.py

TWILIO_ACCOUNT_SID = 'votre_account_sid'
TWILIO_AUTH_TOKEN = 'votre_auth_token'
TWILIO_FROM_NUMBER = '+1234567890'  # Numéro Twilio

Create a utils.py file to manage sending SMS:

# utils.py

from django.conf import settings
from twilio.rest import Client

def send_sms(to, message):
    client = Client(settings.TWILIO_ACCOUNT_SID, settings.TWILIO_AUTH_TOKEN)
    message = client.messages.create(
        body=message,
        from_=settings.TWILIO_FROM_NUMBER,
        to=str(to)
    )
    return message.sid

5. Create DRF Serializers

Create serializers to handle the verification request and code validation.

pip install djangorestframework twilio django-phonenumber-field

6. Create API Views and Routes

Create views to manage verification requests and code validation.

# settings.py

INSTALLED_APPS = [
    # ...
    'rest_framework',
    'phonenumber_field',
    # ...
]

Note: You may want to adjust these views as needed, such as if you want to create a user during verification or manage existing users differently.

7. Configure API Routes

Add the corresponding routes in your urls.py.

# models.py

from django.contrib.auth.models import AbstractBaseUser, BaseUserManager
from django.db import models
from phonenumber_field.modelfields import PhoneNumberField

class UserManager(BaseUserManager):
    def create_user(self, email, username, phone_number, password=None):
        if not email:
            raise ValueError('Les utilisateurs doivent avoir une adresse email')
        if not phone_number:
            raise ValueError('Les utilisateurs doivent avoir un numéro de téléphone')

        user = self.model(
            email=self.normalize_email(email),
            username=username,
            phone_number=phone_number,
        )

        user.set_password(password)
        user.save(using=self._db)
        return user

    def create_superuser(self, email, username, phone_number, password=None):
        user = self.create_user(
            email,
            username,
            phone_number,
            password=password,
        )
        user.is_admin = True
        user.save(using=self._db)
        return user

class CustomUser(AbstractBaseUser):
    email = models.EmailField(verbose_name='adresse email', max_length=255, unique=True)
    username = models.CharField(max_length=50, unique=True)
    phone_number = PhoneNumberField(unique=True, null=False, blank=False)
    is_active = models.BooleanField(default=True)
    is_admin = models.BooleanField(default=False)
    is_phone_verified = models.BooleanField(default=False)

    objects = UserManager()

    USERNAME_FIELD = 'email'
    REQUIRED_FIELDS = ['username', 'phone_number']

    def __str__(self):
        return self.email

    @property
    def is_staff(self):
        return self.is_admin

8. Add Additional Logics (Optional)

has. Generation of Unique Code per User

Edit the request view to associate the code with a specific user or create a new user.

b. Limit the Number of Requests

To avoid abuse, limit the number of verification requests per user or phone number.

# models.py

import random
import string
from django.utils import timezone
from datetime import timedelta

class PhoneVerification(models.Model):
    user = models.ForeignKey(CustomUser, on_delete=models.CASCADE, related_name='phone_verifications')
    code = models.CharField(max_length=6)
    created_at = models.DateTimeField(auto_now_add=True)
    is_verified = models.BooleanField(default=False)

    def is_expired(self):
        return self.created_at < timezone.now() - timedelta(minutes=10)  # Expire après 10 minutes

    def __str__(self):
        return f"Vérification de {self.user.email} - {'Validé' if self.is_verified else 'En attente'}"

c. User Management during Verification

You can decide to create a user after verification or associate the number with an existing user.

9. Tests and Validation

Be sure to test your system in a development environment before deploying it to production. Check that:

• SMS messages are sent correctly.
• Codes are generated and stored securely.
• Checks expire after the set time.
• Errors are correctly handled and communicated to the user.

Complete Implementation Example

To give you an overview, here is a complete example of the affected files.

models.py

# settings.py

TWILIO_ACCOUNT_SID = 'votre_account_sid'
TWILIO_AUTH_TOKEN = 'votre_auth_token'
TWILIO_FROM_NUMBER = '+1234567890'  # Numéro Twilio

serializers.py

# utils.py

from django.conf import settings
from twilio.rest import Client

def send_sms(to, message):
    client = Client(settings.TWILIO_ACCOUNT_SID, settings.TWILIO_AUTH_TOKEN)
    message = client.messages.create(
        body=message,
        from_=settings.TWILIO_FROM_NUMBER,
        to=str(to)
    )
    return message.sid

views.py

# serializers.py

from rest_framework import serializers
from .models import CustomUser, PhoneVerification
from phonenumber_field.serializerfields import PhoneNumberField

class PhoneVerificationRequestSerializer(serializers.Serializer):
    phone_number = PhoneNumberField()

    def validate_phone_number(self, value):
        if CustomUser.objects.filter(phone_number=value).exists():
            raise serializers.ValidationError("Ce numéro de téléphone est déjà utilisé.")
        return value

class PhoneVerificationCodeSerializer(serializers.Serializer):
    phone_number = PhoneNumberField()
    code = serializers.CharField(max_length=6)

    def validate(self, data):
        phone_number = data.get('phone_number')
        code = data.get('code')

        try:
            user = CustomUser.objects.get(phone_number=phone_number)
        except CustomUser.DoesNotExist:
            raise serializers.ValidationError("Utilisateur non trouvé avec ce numéro de téléphone.")

        try:
            verification = PhoneVerification.objects.filter(user=user, code=code, is_verified=False).latest('created_at')
        except PhoneVerification.DoesNotExist:
            raise serializers.ValidationError("Code de vérification invalide.")

        if verification.is_expired():
            raise serializers.ValidationError("Le code de vérification a expiré.")

        data['user'] = user
        data['verification'] = verification
        return data

urls.py

# views.py

from rest_framework import generics, status
from rest_framework.response import Response
from .serializers import PhoneVerificationRequestSerializer, PhoneVerificationCodeSerializer
from .models import CustomUser, PhoneVerification
from .utils import send_sms
import random
import string
from django.utils import timezone
from rest_framework.permissions import AllowAny

class PhoneVerificationRequestView(generics.GenericAPIView):
    serializer_class = PhoneVerificationRequestSerializer
    permission_classes = [AllowAny]

    def post(self, request, *args, **kwargs):
        serializer = self.get_serializer(data=request.data)
        serializer.is_valid(raise_exception=True)
        phone_number = serializer.validated_data['phone_number']

        # Générer un code de 6 chiffres
        code = ''.join(random.choices(string.digits, k=6))

        try:
            user = CustomUser.objects.get(phone_number=phone_number)
            # Si l'utilisateur existe déjà, ne pas permettre la création d'un nouveau
            return Response({"detail": "Ce numéro de téléphone est déjà associé à un utilisateur."}, status=status.HTTP_400_BAD_REQUEST)
        except CustomUser.DoesNotExist:
            pass  # Permettre la création si nécessaire

        # Créer une instance de PhoneVerification
        verification = PhoneVerification.objects.create(user=None, code=code)  # user=None pour l'instant

        # Envoyer le code par SMS
        try:
            send_sms(phone_number, f"Votre code de vérification est : {code}")
        except Exception as e:
            return Response({"detail": "Erreur lors de l'envoi du SMS."}, status=status.HTTP_500_INTERNAL_SERVER_ERROR)

        return Response({"detail": "Code de vérification envoyé."}, status=status.HTTP_200_OK)

class PhoneVerificationCodeView(generics.GenericAPIView):
    serializer_class = PhoneVerificationCodeSerializer
    permission_classes = [AllowAny]

    def post(self, request, *args, **kwargs):
        serializer = self.get_serializer(data=request.data)
        serializer.is_valid(raise_exception=True)
        user = serializer.validated_data['user']
        verification = serializer.validated_data['verification']

        # Marquer la vérification comme validée
        verification.is_verified = True
        verification.save()

        # Mettre à jour l'utilisateur
        user.is_phone_verified = True
        user.save()

        return Response({"detail": "Numéro de téléphone vérifié avec succès."}, status=status.HTTP_200_OK)

utils.py

# urls.py

from django.urls import path
from .views import PhoneVerificationRequestView, PhoneVerificationCodeView

urlpatterns = [
    path('api/verify-phone/request/', PhoneVerificationRequestView.as_view(), name='phone-verification-request'),
    path('api/verify-phone/verify/', PhoneVerificationCodeView.as_view(), name='phone-verification-verify'),
]

10. Secure and Optimize

• Limit Verification Attempts: Implement a system to limit the number of verification attempts to avoid brute force attacks.

• Encrypt Codes: For added security, you can encrypt the verification codes in the database.

• Use Asynchronous Tasks: To improve performance, use asynchronous tasks (for example with Celery) to send SMS without blocking API requests.

• Configure HTTPS: Make sure your API is accessible via HTTPS to secure communications.

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