intg/src/main/python/apache_ranger/utils.py

#!/usr/bin/env python

#
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements.  See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You 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.

import enum

APPLICATION_JSON         = 'application/json'


def non_null(obj, defValue):
    return obj if obj is not None else defValue

def type_coerce(obj, objType):
    if isinstance(obj, objType):
        ret = obj
    elif isinstance(obj, dict):
        ret = objType(obj)

        ret.type_coerce_attrs()
    else:
        ret = None

    return ret

def type_coerce_list(obj, objType):
    if isinstance(obj, list):
        ret = []
        for entry in obj:
            ret.append(type_coerce(entry, objType))
    else:
        ret = None

    return ret

def type_coerce_dict(obj, objType):
    if isinstance(obj, dict):
        ret = {}
        for k, v in obj.items():
            ret[k] = type_coerce(v, objType)
    else:
        ret = None

    return ret

def type_coerce_dict_list(obj, objType):
    if isinstance(obj, dict):
        ret = {}
        for k, v in obj.items():
            ret[k] = type_coerce_list(v, objType)
    else:
        ret = None

    return ret


class API:
    def __init__(self, path, method, expected_status, consumes=APPLICATION_JSON, produces=APPLICATION_JSON):
        self.path            = path
        self.method          = method
        self.expected_status = expected_status
        self.consumes        = consumes
        self.produces        = produces

    def format_path(self, params):
        return API(self.path.format(**params), self.method, self.expected_status, self.consumes, self.produces)


class HttpMethod(enum.Enum):
    GET    = "GET"
    PUT    = "PUT"
    POST   = "POST"
    DELETE = "DELETE"


class HTTPStatus:
    OK                    = 200
    NO_CONTENT            = 204
    INTERNAL_SERVER_ERROR = 500
    SERVICE_UNAVAILABLE   = 503