class CustomJWTSerializer(JSONWebTokenSerializer):

    def validate(self, attrs):

        password = attrs.get("password")
        user_obj = User.objects.filter(phone_number=attrs.get("phone_number")).first()
        if user_obj is not None:
            credentials = {
                'phone_number': user_obj.phone_number,
                'password': password
            }
            if all(credentials.values()):
                user = authenticate(**credentials)
                if user:
                    if not user.is_active:
                        msg = _('User account is disabled.')
                        raise serializers.ValidationError(msg)

                    payload = jwt_payload_handler(user)

                    return {
                        'token': jwt_encode_handler(payload),
                        'user': user
                    }
                else:
                    msg = _('Unable to log in with provided credentials.')
                    raise serializers.ValidationError(msg)

            else:
                msg = _('Not enough data')
                raise serializers.ValidationError(msg)

        else:
            msg = _('Account with this phone number does not exists')
            raise serializers.ValidationError(msg)