Synnefo

# Copyright (C) 2012, 2013 GRNET S.A. All rights reserved.

#

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# without modification, are permitted provided that the following

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#   1. Redistributions of source code must retain the above

#      copyright notice, this list of conditions and the following

#      disclaimer.

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#   2. Redistributions in binary form must reproduce the above

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#      disclaimer in the documentation and/or other materials

#      provided with the distribution.

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# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS

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import logging

import urlparse

import urllib

import hashlib

from copy import copy

import simplejson

from astakosclient.utils import retry, scheme_to_class

from astakosclient.errors import \

    AstakosClientException, Unauthorized, BadRequest, NotFound, Forbidden, \

    NoUserName, NoUUID

# --------------------------------------------------------------------

# Astakos Client Class

def get_token_from_cookie(request, cookie_name):

    """Extract token from the cookie name provided

    Cookie should be in the same form as astakos

    service sets its cookie contents:

        <user_uniq>|<user_token>

    """

    try:

        cookie_content = urllib.unquote(request.COOKIE.get(cookie_name, None))

        return cookie_content.split("|")[1]

    except:

        return None

class AstakosClient():

    """AstakosClient Class Implementation"""

    # ----------------------------------

    def __init__(self, astakos_url, retry=0,

                 use_pool=False, pool_size=8, logger=None):

        """Initialize AstakosClient Class

        Keyword arguments:

        astakos_url -- i.e https://accounts.example.com (string)

        use_pool    -- use objpool for http requests (boolean)

        retry       -- how many time to retry (integer)

        logger      -- pass a different logger

        """

        if logger is None:

            logging.basicConfig(

                format='%(asctime)s [%(levelname)s] %(name)s %(message)s',

                datefmt='%Y-%m-%d %H:%M:%S',

                level=logging.INFO)

            logger = logging.getLogger("astakosclient")

        logger.debug("Intialize AstakosClient: astakos_url = %s, "

                     "use_pool = %s" % (astakos_url, use_pool))

        if not astakos_url:

            m = "Astakos url not given"

            logger.error(m)

            raise ValueError(m)

        # Check for supported scheme

        p = urlparse.urlparse(astakos_url)

        conn_class = scheme_to_class(p.scheme, use_pool, pool_size)

        if conn_class is None:

            m = "Unsupported scheme: %s" % p.scheme

            logger.error(m)

            raise ValueError(m)

        # Save astakos_url etc. in our class

        self.retry = retry

        self.logger = logger

        self.netloc = p.netloc

        self.scheme = p.scheme

        self.conn_class = conn_class

    # ----------------------------------

    @retry

    def _call_astakos(self, token, request_path,

                      headers=None, body=None, method="GET"):

        """Make the actual call to Astakos Service"""

        if token is not None:

            hashed_token = hashlib.sha1()

            hashed_token.update(token)

            using_token = "using token %s" % (hashed_token.hexdigest())

        else:

            using_token = "without using token"

        self.logger.debug(

            "Make a %s request to %s %s with headers %s and body %s"

            % (method, request_path, using_token, headers, body))

        # Check Input

        if headers is None:

            headers = {}

        if body is None:

            body = {}

        if request_path[0] != '/':

            request_path = "/" + request_path

        # Build request's header and body

        kwargs = {}

        kwargs['headers'] = copy(headers)

        if token is not None:

            kwargs['headers']['X-Auth-Token'] = token

        if body:

            kwargs['body'] = copy(body)

            kwargs['headers'].setdefault(

                'content-type', 'application/octet-stream')

        kwargs['headers'].setdefault('content-length',

                                     len(body) if body else 0)

        try:

            # Get the connection object

            with self.conn_class(self.netloc) as conn:

                # Send request

                (message, data, status) = \

                    _do_request(conn, method, request_path, **kwargs)

        except Exception as err:

            self.logger.error("Failed to send request: %s" % repr(err))

            raise AstakosClientException(str(err))

        # Return

        self.logger.debug("Request returned with status %s" % status)

        if status == 400:

            raise BadRequest(message, data)

        elif status == 401:

            raise Unauthorized(message, data)

        elif status == 403:

            raise Forbidden(message, data)

        elif status == 404:

            raise NotFound(message, data)

        elif status < 200 or status >= 300:

            raise AstakosClientException(message, data, status)

        return simplejson.loads(unicode(data))

    # ------------------------

    # GET /im/authenticate

    def get_user_info(self, token, usage=False):

        """Authenticate user and get user's info as a dictionary

        Keyword arguments:

        token   -- user's token (string)

        usage   -- return usage information for user (boolean)

        In case of success return user information (json parsed format).

        Otherwise raise an AstakosClientException.

        """

        # Send request

        auth_path = "/im/authenticate"

        if usage:

            auth_path += "?usage=1"

        return self._call_astakos(token, auth_path)

    # ----------------------------------

    # POST /user_catalogs (or /service/api/user_catalogs)

    #   with {'uuids': uuids}

    def _uuid_catalog(self, token, uuids, req_path):

        req_headers = {'content-type': 'application/json'}

        req_body = simplejson.dumps({'uuids': uuids})

        data = self._call_astakos(

            token, req_path, req_headers, req_body, "POST")

        if "uuid_catalog" in data:

            return data.get("uuid_catalog")

        else:

            m = "_uuid_catalog request returned %s. No uuid_catalog found" \

                % data

            self.logger.error(m)

            raise AstakosClientException(m)

    def get_usernames(self, token, uuids):

        """Return a uuid_catalog dictionary for the given uuids

        Keyword arguments:

        token   -- user's token (string)

        uuids   -- list of user ids (list of strings)

        The returned uuid_catalog is a dictionary with uuids as

        keys and the corresponding user names as values

        """

        req_path = "/user_catalogs"

        return self._uuid_catalog(token, uuids, req_path)

    def get_username(self, token, uuid):

        """Return the user name of a uuid (see get_usernames)"""

        if not uuid:

            m = "No uuid was given"

            self.logger.error(m)

            raise ValueError(m)

        uuid_dict = self.get_usernames(token, [uuid])

        if uuid in uuid_dict:

            return uuid_dict.get(uuid)

        else:

            raise NoUserName(uuid)

    def service_get_usernames(self, token, uuids):

        """Return a uuid_catalog dict using a service's token"""

        req_path = "/service/api/user_catalogs"

        return self._uuid_catalog(token, uuids, req_path)

    def service_get_username(self, token, uuid):

        """Return the displayName of a uuid using a service's token"""

        if not uuid:

            m = "No uuid was given"

            self.logger.error(m)

            raise ValueError(m)

        uuid_dict = self.service_get_usernames(token, [uuid])

        if uuid in uuid_dict:

            return uuid_dict.get(uuid)

        else:

            raise NoUserName(uuid)

    # ----------------------------------

    # POST /user_catalogs (or /service/api/user_catalogs)

    #   with {'displaynames': display_names}

    def _displayname_catalog(self, token, display_names, req_path):

        req_headers = {'content-type': 'application/json'}

        req_body = simplejson.dumps({'displaynames': display_names})

        data = self._call_astakos(

            token, req_path, req_headers, req_body, "POST")

        if "displayname_catalog" in data:

            return data.get("displayname_catalog")

        else:

            m = "_displayname_catalog request returned %s. " \

                "No displayname_catalog found" % data

            self.logger.error(m)

            raise AstakosClientException(m)

    def get_uuids(self, token, display_names):

        """Return a displayname_catalog for the given names

        Keyword arguments:

        token           -- user's token (string)

        display_names   -- list of user names (list of strings)

        The returned displayname_catalog is a dictionary with

        the names as keys and the corresponding uuids as values

        """

        req_path = "/user_catalogs"

        return self._displayname_catalog(token, display_names, req_path)

    def get_uuid(self, token, display_name):

        """Return the uuid of a name (see getUUIDs)"""

        if not display_name:

            m = "No display_name was given"

            self.logger.error(m)

            raise ValueError(m)

        name_dict = self.get_uuids(token, [display_name])

        if display_name in name_dict:

            return name_dict.get(display_name)

        else:

            raise NoUUID(display_name)

    def service_get_uuids(self, token, display_names):

        """Return a display_name catalog using a service's token"""

        req_path = "/service/api/user_catalogs"

        return self._displayname_catalog(token, display_names, req_path)

    def service_get_uuid(self, token, display_name):

        """Return the uuid of a name using a service's token"""

        if not display_name:

            m = "No display_name was given"

            self.logger.error(m)

            raise ValueError(m)

        name_dict = self.service_get_uuids(token, [display_name])

        if display_name in name_dict:

            return name_dict.get(display_name)

        else:

            raise NoUUID(display_name)

    # ----------------------------------

    # GET "/im/get_services"

    def get_services(self):

        """Return a list of dicts with the registered services"""

        return self._call_astakos(None, "/im/get_services")

    # ----------------------------------

    # GET "/astakos/api/resources"

    def get_resources(self):

        """Return a dict of dicts with the available resources"""

        return self._call_astakos(None, "/astakos/api/resources")

# --------------------------------------------------------------------

# Private functions

# We want _doRequest to be a distinct function

# so that we can replace it during unit tests.

def _do_request(conn, method, url, **kwargs):

    """The actual request. This function can easily be mocked"""

    conn.request(method, url, **kwargs)

    response = conn.getresponse()

    length = response.getheader('content-length', None)

    data = response.read(length)

    status = int(response.status)

    message = response.reason

    return (message, data, status)