Synnefo

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

#

# Redistribution and use in source and binary forms, with or

# without modification, are permitted provided that the following

# conditions are met:

#

#   1. Redistributions of source code must retain the above

#      copyright notice, this list of conditions and the following

#      disclaimer.

#

#   2. Redistributions in binary form must reproduce the above

#      copyright notice, this list of conditions and the following

#      disclaimer in the documentation and/or other materials

#      provided with the distribution.

#

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

# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR

# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF

# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED

# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN

# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

# POSSIBILITY OF SUCH DAMAGE.

#

# The views and conclusions contained in the software and

# documentation are those of the authors and should not be

# interpreted as representing official policies, either expressed

# or implied, of GRNET S.A.

import logging

import urlparse

import urllib

import hashlib

from copy import copy

import simplejson

from astakosclient.utils import \

    retry, scheme_to_class, parse_request, check_input

from astakosclient.errors import \

    AstakosClientException, Unauthorized, BadRequest, NotFound, Forbidden, \

    NoUserName, NoUUID, BadValue, QuotaLimit, InvalidResponse

from .keypath import get_path

from .services import astakos_services

# Customize astakos_services here?

def join_urls(a, b):

    """join_urls from synnefo.lib"""

    return a.rstrip("/") + "/" + b.lstrip("/")

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

# Astakos API urls

ACCOUNTS_PREFIX = get_path(astakos_services, 'astakos_account.prefix')

ACCOUNTS_PREFIX = join_urls(ACCOUNTS_PREFIX, 'v1.0')

API_AUTHENTICATE = join_urls(ACCOUNTS_PREFIX, "authenticate")

API_USERCATALOGS = join_urls(ACCOUNTS_PREFIX, "user_catalogs")

API_SERVICE_USERCATALOGS = join_urls(ACCOUNTS_PREFIX, "service/user_catalogs")

API_GETSERVICES = join_urls(ACCOUNTS_PREFIX, "get_services")

API_RESOURCES = join_urls(ACCOUNTS_PREFIX, "resources")

API_QUOTAS = join_urls(ACCOUNTS_PREFIX, "quotas")

API_SERVICE_QUOTAS = join_urls(ACCOUNTS_PREFIX, "service_quotas")

API_COMMISSIONS = join_urls(ACCOUNTS_PREFIX, "commissions")

API_COMMISSIONS_ACTION = join_urls(API_COMMISSIONS, "action")

API_FEEDBACK = join_urls(ACCOUNTS_PREFIX, "feedback")

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

# Astakos Keystone API urls

IDENTITY_PREFIX = get_path(astakos_services, 'astakos_identity.prefix')

API_TOKENS = join_urls(IDENTITY_PREFIX, "tokens")

TOKENS_ENDPOINTS = join_urls(API_TOKENS, "endpoints")

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

# 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))

        check_input("__init__", logger, astakos_url=astakos_url)

        # 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 BadValue(m)

        # Save astakos_url etc. in our class

        self.retry = retry

        self.logger = logger

        self.netloc = p.netloc

        self.scheme = p.scheme

        self.path = p.path.rstrip('/')

        self.conn_class = conn_class

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

    @retry

    def _call_astakos(self, token, request_path, headers=None,

                      body=None, method="GET", log_body=True):

        """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 if log_body else "(not logged)"))

        # Check Input

        if headers is None:

            headers = {}

        if body is None:

            body = {}

        path = self.path + "/" + request_path.strip('/')

        # 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, 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)

        try:

            if data:

                return simplejson.loads(unicode(data))

            else:

                return None

        except Exception as err:

            self.logger.error("Cannot parse response \"%s\" with simplejson: %s"

                              % (data, str(err)))

            raise InvalidResponse(str(err), data)

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

    # do a GET to ``API_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 = copy(API_AUTHENTICATE)

        if usage:

            auth_path += "?usage=1"

        return self._call_astakos(token, auth_path)

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

    # do a POST to ``API_USERCATALOGS`` (or ``API_SERVICE_USERCATALOGS``)

    #   with {'uuids': uuids}

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

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

        req_body = parse_request({'uuids': uuids}, self.logger)

        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 = copy(API_USERCATALOGS)

        return self._uuid_catalog(token, uuids, req_path)

    def get_username(self, token, uuid):

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

        check_input("get_username", self.logger, uuid=uuid)

        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 = copy(API_SERVICE_USERCATALOGS)

        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"""

        check_input("service_get_username", self.logger, uuid=uuid)

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

        if uuid in uuid_dict:

            return uuid_dict.get(uuid)

        else:

            raise NoUserName(uuid)

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

    # do a POST to ``API_USERCATALOGS`` (or ``API_SERVICE_USERCATALOGS``)

    #   with {'displaynames': display_names}

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

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

        req_body = parse_request({'displaynames': display_names}, self.logger)

        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 = copy(API_USERCATALOGS)

        return self._displayname_catalog(token, display_names, req_path)

    def get_uuid(self, token, display_name):

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

        check_input("get_uuid", self.logger, display_name=display_name)

        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 = copy(API_SERVICE_USERCATALOGS)

        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"""

        check_input("service_get_uuid", self.logger, display_name=display_name)

        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)

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

    # do a GET to ``API_GETSERVICES``

    def get_services(self):

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

        return self._call_astakos(None, copy(API_GETSERVICES))

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

    # do a GET to ``API_RESOURCES``

    def get_resources(self):

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

        return self._call_astakos(None, copy(API_RESOURCES))

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

    # do a POST to ``API_FEEDBACK``

    def send_feedback(self, token, message, data):

        """Send feedback to astakos service

        keyword arguments:

        token       -- user's token (string)

        message     -- Feedback message

        data        -- Additional information about service client status

        In case of success return nothing.

        Otherwise raise an AstakosClientException

        """

        check_input("send_feedback", self.logger, message=message, data=data)

        path = copy(API_FEEDBACK)

        req_body = urllib.urlencode(

            {'feedback_msg': message, 'feedback_data': data})

        self._call_astakos(token, path, None, req_body, "POST")

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

    # do a GET to ``API_TOKENS``/<user_token>/``TOKENS_ENDPOINTS``

    def get_endpoints(self, token, belongs_to=None, marker=None, limit=None):

        """Request registered endpoints from astakos

        keyword arguments:

        token       -- user's token (string)

        belongs_to  -- user's uuid (string)

        marker      -- return endpoints whose ID is higher than marker's (int)

        limit       -- maximum number of endpoints to return (int)

        Return a json formatted dictionary containing information

        about registered endpoints.

        WARNING: This api call encodes the user's token inside the url.

        It's thoughs security unsafe to use it (both astakosclient and

        nginx tend to log requested urls).

        Avoid the use of get_endpoints method and use

        get_user_info_with_endpoints instead.

        """

        params = {}

        if belongs_to is not None:

            params['belongsTo'] = str(belongs_to)

        if marker is not None:

            params['marker'] = str(marker)

        if limit is not None:

            params['limit'] = str(limit)

        path = API_TOKENS + "/" + token + "/" + \

            TOKENS_ENDPOINTS + "?" + urllib.urlencode(params)

        return self._call_astakos(token, path)

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

    # do a POST to ``API_TOKENS``

    def get_user_info_with_endpoints(self, token, uuid=None):

        """ Fallback call for authenticate

        Keyword arguments:

        token   -- user's token (string)

        uuid    -- user's uniq id

        It returns back the token as well as information about the token

        holder and the services he/she can acess (in json format).

        In case of error raise an AstakosClientException.

        """

        req_path = copy(API_TOKENS)

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

        body = {'auth': {'token': {'id': token}}}

        if uuid is not None:

            body['auth']['tenantName'] = uuid

        req_body = parse_request(body, self.logger)

        return self._call_astakos(token, req_path, req_headers,

                                  req_body, "POST", False)

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

    # do a GET to ``API_QUOTAS``

    def get_quotas(self, token):

        """Get user's quotas

        Keyword arguments:

        token   -- user's token (string)

        In case of success return a dict of dicts with user's current quotas.

        Otherwise raise an AstakosClientException

        """

        return self._call_astakos(token, copy(API_QUOTAS))

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

    # do a GET to ``API_SERVICE_QUOTAS``

    def service_get_quotas(self, token, user=None):

        """Get all quotas for resources associated with the service

        Keyword arguments:

        token   -- service's token (string)

        user    -- optionally, the uuid of a specific user

        In case of success return a dict of dicts of dicts with current quotas

        for all users, or of a specified user, if user argument is set.

        Otherwise raise an AstakosClientException

        """

        query = copy(API_SERVICE_QUOTAS)

        if user is not None:

            query += "?user=" + user

        return self._call_astakos(token, query)

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

    # do a POST to ``API_COMMISSIONS``

    def issue_commission(self, token, request):

        """Issue a commission

        Keyword arguments:

        token   -- service's token (string)

        request -- commision request (dict)

        In case of success return commission's id (int).

        Otherwise raise an AstakosClientException.

        """

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

        req_body = parse_request(request, self.logger)

        try:

            response = self._call_astakos(token, copy(API_COMMISSIONS),

                                          req_headers, req_body, "POST")

        except AstakosClientException as err:

            if err.status == 413:

                raise QuotaLimit(err.message, err.details)

            else:

                raise

        if "serial" in response:

            return response['serial']

        else:

            m = "issue_commission_core request returned %s. No serial found" \

                % response

            self.logger.error(m)

            raise AstakosClientException(m)

    def issue_one_commission(self, token, holder, source, provisions,

                             name="", force=False, auto_accept=False):

        """Issue one commission (with specific holder and source)

        keyword arguments:

        token       -- service's token (string)

        holder      -- user's id (string)

        source      -- commission's source (ex system) (string)

        provisions  -- resources with their quantity (dict from string to int)

        name        -- description of the commission (string)

        force       -- force this commission (boolean)

        auto_accept -- auto accept this commission (boolean)

        In case of success return commission's id (int).

        Otherwise raise an AstakosClientException.

        (See also issue_commission)

        """

        check_input("issue_one_commission", self.logger,

                    holder=holder, source=source,

                    provisions=provisions)

        request = {}

        request["force"] = force

        request["auto_accept"] = auto_accept

        request["name"] = name

        try:

            request["provisions"] = []

            for resource, quantity in provisions.iteritems():

                t = {"holder": holder, "source": source,

                     "resource": resource, "quantity": quantity}

                request["provisions"].append(t)

        except Exception as err:

            self.logger.error(str(err))

            raise BadValue(str(err))

        return self.issue_commission(token, request)

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

    # do a GET to ``API_COMMISSIONS``

    def get_pending_commissions(self, token):

        """Get Pending Commissions

        Keyword arguments:

        token   -- service's token (string)

        In case of success return a list of pending commissions' ids

        (list of integers)

        """

        return self._call_astakos(token, copy(API_COMMISSIONS))

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

    # do a GET to ``API_COMMISSIONS``/<serial>

    def get_commission_info(self, token, serial):

        """Get Description of a Commission

        Keyword arguments:

        token   -- service's token (string)

        serial  -- commission's id (int)

        In case of success return a dict of dicts containing

        informations (details) about the requested commission

        """

        check_input("get_commission_info", self.logger, serial=serial)

        path = API_COMMISSIONS + "/" + str(serial)

        return self._call_astakos(token, path)

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

    # do a POST to ``API_COMMISSIONS``/<serial>/action"

    def commission_action(self, token, serial, action):

        """Perform a commission action

        Keyword arguments:

        token   -- service's token (string)

        serial  -- commission's id (int)

        action  -- action to perform, currently accept/reject (string)

        In case of success return nothing.

        """

        check_input("commission_action", self.logger,

                    serial=serial, action=action)

        path = API_COMMISSIONS + "/" + str(serial) + "/action"

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

        req_body = parse_request({str(action): ""}, self.logger)

        self._call_astakos(token, path, req_headers, req_body, "POST")

    def accept_commission(self, token, serial):

        """Accept a commission (see commission_action)"""

        self.commission_action(token, serial, "accept")

    def reject_commission(self, token, serial):

        """Reject a commission (see commission_action)"""

        self.commission_action(token, serial, "reject")

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

    # do a POST to ``API_COMMISSIONS_ACTION``

    def resolve_commissions(self, token, accept_serials, reject_serials):

        """Resolve multiple commissions at once

        Keyword arguments:

        token           -- service's token (string)

        accept_serials  -- commissions to accept (list of ints)

        reject_serials  -- commissions to reject (list of ints)

        In case of success return a dict of dicts describing which

        commissions accepted, which rejected and which failed to

        resolved.

        """

        check_input("resolve_commissions", self.logger,

                    accept_serials=accept_serials,

                    reject_serials=reject_serials)

        path = copy(API_COMMISSIONS_ACTION)

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

        req_body = parse_request({"accept": accept_serials,

                                  "reject": reject_serials},

                                 self.logger)

        return self._call_astakos(token, path, req_headers, req_body, "POST")

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

# 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)