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path: root/moonv4/moon_authz/moon_authz/http_server.py
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# Copyright 2015 Open Platform for NFV Project, Inc. and its contributors
# This software is distributed under the terms and conditions of the 'Apache-2.0'
# license which can be found in the file 'LICENSE' in this package distribution
# or at 'http://www.apache.org/licenses/LICENSE-2.0'.

from flask import Flask, request
# from flask_cors import CORS, cross_origin
from flask_restful import Resource, Api, reqparse
import logging
from moon_utilities import exceptions
from moon_authz import __version__
from moon_authz.api.authorization import Authz
from moon_utilities.cache import Cache

logger = logging.getLogger("moon." + __name__)

CACHE = Cache()
CACHE.update()


class Server:
    """Base class for HTTP server"""

    def __init__(self, host="localhost", port=80, api=None, **kwargs):
        """Run a server

        :param host: hostname of the server
        :param port: port for the running server
        :param kwargs: optional parameters
        :return: a running server
        """
        self._host = host
        self._port = port
        self._api = api
        self._extra = kwargs

    @property
    def host(self):
        return self._host

    @host.setter
    def host(self, name):
        self._host = name

    @host.deleter
    def host(self):
        self._host = ""

    @property
    def port(self):
        return self._port

    @port.setter
    def port(self, number):
        self._port = number

    @port.deleter
    def port(self):
        self._port = 80

    def run(self):
        raise NotImplementedError()

__API__ = (
    Authz,
 )


class Root(Resource):
    """
    The root of the web service
    """
    __urls__ = ("/", )
    __methods = ("get", "post", "put", "delete", "options")

    def get(self):
        tree = {"/": {"methods": ("get",), "description": "List all methods for that service."}}
        for item in __API__:
            tree[item.__name__] = {"urls": item.__urls__}
            _methods = []
            for _method in self.__methods:
                if _method in dir(item):
                    _methods.append(_method)
            tree[item.__name__]["methods"] = _methods
            tree[item.__name__]["description"] = item.__doc__.strip()
        return {
            "version": __version__,
            "tree": tree
        }

    def head(self):
        return "", 201


class HTTPServer(Server):

    def __init__(self, host="0.0.0.0", port=38001, **kwargs):
        super(HTTPServer, self).__init__(host=host, port=port, **kwargs)
        self.component_data = kwargs.get("component_data", {})
        logger.info("HTTPServer port={} {}".format(port, kwargs))
        self.app = Flask(__name__)
        self._port = port
        self._host = host
        # Todo : specify only few urls instead of *
        # CORS(self.app)
        self.component_id = kwargs.get("component_id")
        self.keystone_project_id = kwargs.get("keystone_project_id")
        self.container_chaining = kwargs.get("container_chaining")
        self.api = Api(self.app)
        self.__set_route()
        # self.__hook_errors()

        @self.app.errorhandler(exceptions.AuthException)
        def _auth_exception(error):
            return {"error": "Unauthorized"}, 401

    def __hook_errors(self):
        # FIXME (dthom): it doesn't work
        def get_404_json(e):
            return {"error": "Error", "code": 404, "description": e}
        self.app.register_error_handler(404, get_404_json)

        def get_400_json(e):
            return {"error": "Error", "code": 400, "description": e}
        self.app.register_error_handler(400, lambda e: get_400_json)
        self.app.register_error_handler(403, exceptions.AuthException)

    def __set_route(self):
        self.api.add_resource(Root, '/')

        for api in __API__:
            self.api.add_resource(api, *api.__urls__,
                                  resource_class_kwargs={
                                      "component_data": self.component_data,
                                      "cache": CACHE
                                  }
                                  )

    def run(self):
        self.app.run(host=self._host, port=self._port)  # nosec