# copyright 2013-2014 LOGILAB S.A. (Paris, FRANCE), all rights reserved.

# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr

#

# This file is part of CubicWeb.

#

# CubicWeb is free software: you can redistribute it and/or modify it under the

# terms of the GNU Lesser General Public License as published by the Free

# Software Foundation, either version 2.1 of the License, or (at your option)

# any later version.

#

# CubicWeb is distributed in the hope that it will be useful, but WITHOUT

# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS

# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more

# details.

#

# You should have received a copy of the GNU Lesser General Public License along

# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.

"""Official API to access the content of a repository

"""

from cubicweb.utils import parse_repo_uri

### private function for specific method ############################

def _get_inmemory_repo(config, vreg=None):

    from cubicweb.server.repository import Repository

    from cubicweb.server.utils import TasksManager

    return Repository(config, TasksManager(), vreg=vreg)

### public API ######################################################

def get_repository(uri=None, config=None, vreg=None):

    """get a repository for the given URI or config/vregistry (in case we're

    loading the repository for a client, eg web server, configuration).

    The returned repository may be an in-memory repository or a proxy object

    using a specific RPC method, depending on the given URI.

    """

    if uri is None:

        return _get_inmemory_repo(config, vreg)

    protocol, hostport, appid = parse_repo_uri(uri)

    if protocol == 'inmemory':

        # me may have been called with a dummy 'inmemory://' uri ...

        return _get_inmemory_repo(config, vreg)

    raise ConnectionError('unknown protocol: `%s`' % protocol)

def connect(repo, login, **kwargs):

    """Take credential and return associated ClientConnection.

    The ClientConnection is associated to a new Session object that will be

    closed when the ClientConnection is closed.

    raise AuthenticationError if the credential are invalid."""

    sessionid = repo.connect(login, **kwargs)

    session = repo._get_session(sessionid)

    # XXX the autoclose_session should probably be handle on the session directly

    # this is something to consider once we have proper server side Connection.

def anonymous_cnx(repo):

    """return a ClientConnection for Anonymous user.

    The ClientConnection is associated to a new Session object that will be

    closed when the ClientConnection is closed.

    raises an AuthenticationError if anonymous usage is not allowed

    """

    anoninfo = getattr(repo.config, 'anonymous_user', lambda: None)()

    if anoninfo is None: # no anonymous user

        raise AuthenticationError('anonymous access is not authorized')

    anon_login, anon_password = anoninfo

    # use vreg's repository cache

    return connect(repo, anon_login, password=anon_password)