view src/plugins/plugin_misc_groupblog.py @ 2307:8fa7edd0da24

plugin Pubsub Hook: first draft: This new plugin allow to attach an external action to a Pubsub event (i.e. notification). Hook can be persitent accross restarts, or temporary (will be deleted on profile disconnection). Only Python files are handled for now. In the future, it may make sense to move hooks in a generic plugin which could be used by ad-hoc commands, messages, pubsub, etc.
author Goffi <goffi@goffi.org>
date Wed, 05 Jul 2017 15:05:47 +0200
parents 40dd9eb2692c
children 8b37a62336c3
line wrap: on
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#!/usr/bin/env python2
# -*- coding: utf-8 -*-

# SAT plugin for microbloging with roster access
# Copyright (C) 2009-2016 Jérôme Poisson (goffi@goffi.org)

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.

# This program 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 Affero General Public License for more details.

# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

from sat.core.i18n import _
from sat.core.constants import Const as C
from sat.core.log import getLogger
log = getLogger(__name__)
from twisted.internet import defer
from sat.core import exceptions
from wokkel import disco, data_form, iwokkel
from zope.interface import implements
from sat.tools.common import data_format

try:
    from twisted.words.protocols.xmlstream import XMPPHandler
except ImportError:
    from wokkel.subprotocols import XMPPHandler

NS_PUBSUB = 'http://jabber.org/protocol/pubsub'
NS_GROUPBLOG = 'http://salut-a-toi.org/protocol/groupblog'
#NS_PUBSUB_EXP = 'http://goffi.org/protocol/pubsub' #for non official features
NS_PUBSUB_EXP = NS_PUBSUB  # XXX: we can't use custom namespace as Wokkel's PubSubService use official NS
NS_PUBSUB_GROUPBLOG = NS_PUBSUB_EXP + "#groupblog"
NS_PUBSUB_ITEM_CONFIG = NS_PUBSUB_EXP + "#item-config"


PLUGIN_INFO = {
    C.PI_NAME: "Group blogging through collections",
    C.PI_IMPORT_NAME: "GROUPBLOG",
    C.PI_TYPE: "MISC",
    C.PI_PROTOCOLS: [],
    C.PI_DEPENDENCIES: ["XEP-0277"],
    C.PI_MAIN: "GroupBlog",
    C.PI_HANDLER: "yes",
    C.PI_DESCRIPTION: _("""Implementation of microblogging fine permissions""")
}


class GroupBlog(object):
    """This class use a SàT PubSub Service to manage access on microblog"""

    def __init__(self, host):
        log.info(_("Group blog plugin initialization"))
        self.host = host
        self._p = self.host.plugins["XEP-0060"]
        host.trigger.add("XEP-0277_item2data", self._item2dataTrigger)
        host.trigger.add("XEP-0277_data2entry", self._data2entryTrigger)
        host.trigger.add("XEP-0277_comments", self._commentsTrigger)

    ## plugin management methods ##

    def getHandler(self, client):
        return GroupBlog_handler()

    @defer.inlineCallbacks
    def profileConnected(self, client):
        try:
            yield self.host.checkFeatures(client, (NS_PUBSUB_GROUPBLOG,))
        except exceptions.FeatureNotFound:
            client.server_groupblog_available = False
            log.warning(_(u"Server is not able to manage item-access pubsub, we can't use group blog"))
        else:
            client.server_groupblog_available = True
            log.info(_(u"Server can manage group blogs"))

    def getFeatures(self, profile):
        try:
            client = self.host.getClient(profile)
        except exceptions.ProfileNotSetError:
            return {}
        try:
            return {'available': C.boolConst(client.server_groupblog_available)}
        except AttributeError:
            if self.host.isConnected(profile):
                log.debug("Profile is not connected, service is not checked yet")
            else:
                log.error("client.server_groupblog_available should be available !")
            return {}

    def _item2dataTrigger(self, item_elt, entry_elt, microblog_data):
        """Parse item to find group permission elements"""
        config_form = data_form.findForm(item_elt, NS_PUBSUB_ITEM_CONFIG)
        if config_form is None:
            return
        access_model = config_form.get(self._p.OPT_ACCESS_MODEL, self._p.ACCESS_OPEN)
        if access_model == self._p.ACCESS_PUBLISHER_ROSTER:
            data_format.iter2dict('group', config_form.fields[self._p.OPT_ROSTER_GROUPS_ALLOWED].values, microblog_data)

    def _data2entryTrigger(self, client, mb_data, entry_elt, item_elt):
        """Build fine access permission if needed

        This trigger check if "group*" key are present,
        and create a fine item config to restrict view to these groups
        """
        groups = list(data_format.dict2iter('group', mb_data))
        if not groups:
            return
        if not client.server_groupblog_available:
            raise exceptions.CancelError(u"GroupBlog is not available")
        log.debug(u"This entry use group blog")
        form = data_form.Form('submit', formNamespace=NS_PUBSUB_ITEM_CONFIG)
        access = data_form.Field(None, self._p.OPT_ACCESS_MODEL, value=self._p.ACCESS_PUBLISHER_ROSTER)
        allowed = data_form.Field(None, self._p.OPT_ROSTER_GROUPS_ALLOWED, values=groups)
        form.addField(access)
        form.addField(allowed)
        item_elt.addChild(form.toElement())

    def _commentsTrigger(self, client, mb_data, options):
        """This method is called when a comments node is about to be created

        It changes the access mode to roster if needed, and give the authorized groups
        """
        if "group" in mb_data:
            options[self._p.OPT_ACCESS_MODEL] = self._p.ACCESS_PUBLISHER_ROSTER
            options[self._p.OPT_ROSTER_GROUPS_ALLOWED] = list(data_format.dict2iter('group', mb_data))


class GroupBlog_handler(XMPPHandler):
    implements(iwokkel.IDisco)

    def getDiscoInfo(self, requestor, target, nodeIdentifier=''):
        return [disco.DiscoFeature(NS_GROUPBLOG)]

    def getDiscoItems(self, requestor, target, nodeIdentifier=''):
        return []