core: use rest_framework in accounts

accounts/serializers/change_password.py

@@ -0,0 +1,7 @@
+from rest_framework.serializers import Serializer, CharField
+
+class ChangePasswordSerializer(Serializer):
+	
+    current_password = CharField()
+    new_password = CharField()
+    

accounts/serializers/login.py

@@ -0,0 +1,12 @@
+from rest_framework.serializers import Serializer, CharField
+from django.contrib.auth import authenticate
+from django.core.exceptions import ValidationError
+
+class LoginSerializer(Serializer):
+    
+	username = CharField()
+	password = CharField()
+
+	def get_user(self, data):
+		user = authenticate(username=data['username'], password=data['password'])
+		return user

accounts/serializers/register.py

@@ -0,0 +1,12 @@
+from rest_framework.serializers import ModelSerializer 
+from django.contrib.auth.models import User
+
+class RegisterSerialiser(ModelSerializer):
+    class Meta:
+        model = User
+        fields = ['username', 'password']
+        
+    def create(self, data):
+        user_obj = User.objects.create_user(username=data['username'], password=data['password'])
+        user_obj.save()
+        return user_obj