add serializer for auth token

app/myproject/settings.py

@@ -42,6 +42,7 @@
     "django.contrib.staticfiles",
     "core.apps.CoreConfig",
     "rest_framework",
+    "rest_framework.authtoken",
     "drf_spectacular",
     "user.apps.UserConfig",
 ]

app/user/serializers.py

@@ -1,8 +1,12 @@
 """
 Serializers for API view
 """
-from django.contrib.auth import get_user_model
+from django.contrib.auth import (
+    get_user_model,
+    authenticate,
+)
 from rest_framework import serializers
+from django.utils.translation import gettext as _ 
 
 
 class UserSerializer(serializers.ModelSerializer):
@@ -16,3 +20,29 @@ class Meta:
     def create(self, validated_data):
         """Created and return a user with encrypted password"""
         return get_user_model().objects.create_user(**validated_data)
+
+
+class AuthTokenSerializer(serializers.Serializer):
+    """Serializer for the user authentication token"""
+
+    email = serializers.EmailField()
+    password = serializers.CharField(
+        style={"input_type": "password"},
+        trim_whitespace=False,
+    )
+
+    def validate(self, attrs):
+        email = attrs.get("email")
+        password = attrs.get("password")
+        user = authenticate(
+            request=self.context.get("request"),
+            username=email,
+            password=password,
+        )
+
+        if not user:
+            msg = _("Unable to authenticate with provided credentials")
+            raise serializers.ValidationError(msg, code="authorization")
+
+        attrs["user"] = user
+        return attrs