# Copyright 2013 NEC Corporation.  All rights reserved.
#
#    Licensed under the Apache License, Version 2.0 (the "License"); you may
#    not use this file except in compliance with the License. You may obtain
#    a copy of the License at
#
#         http://www.apache.org/licenses/LICENSE-2.0
#
#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
#    License for the specific language governing permissions and limitations
#    under the License.
"""
Request Body validating middleware.

"""

import functools

from validators import _SchemaValidator


def schema(request_body_schema):
    """Register a schema to validate request body.

    Registered schema will be used for validating request body just before
    API method executing.

    :argument dict request_body_schema: a schema to validate request body

    """
    schema_validator = _SchemaValidator(request_body_schema)

    def add_validator(func):
        @functools.wraps(func)
        def wrapper(*args, **kwargs):
            schema_validator.validate(kwargs['body'])
            return func(*args, **kwargs)
        return wrapper
    return add_validator