class AuthenticateSerializer(serializers.ModelSerializer):
	username = serializers.CharField(source='user.username')
	password = serializers.CharField(source='user.password', style={'input_type': 'password'})
	author = AuthorSerializer(allow_null=True, read_only=True)
	class Meta:
		model = User
		depth = 1
		fields = [
			'username',
			'password',
			'author',
		]
		extra_kwargs = {"password": {"write_only": True}}

	def validate(self, attrs):
		validation_data = dict(attrs)['user']
		username = validation_data.get('username', None);
		password = validation_data.get('password', None);
		try:
			user = User.objects.get(username=username)
		except:
			raise ValidationError("Incorrect login/password.")
		if user.check_password(password):
			attrs['author'] = user.author
			return attrs
		raise ValidationError("Incorrect login/password.")