view sat/plugins/plugin_misc_groupblog.py @ 3153:2c7b42f53e9a

core (xmpp): avoid starting several clients at the same time: a check is done to avoid running startConnection several times at once, which would lead to the creation of several SatXMPPEntity instances at the same time, resulting in many issues. If startConnection is called while a previous one is not finished yet, a CancelError is now raised.
author Goffi <goffi@goffi.org>
date Mon, 03 Feb 2020 13:46:24 +0100
parents 559a625a236b
children be6d91572633
line wrap: on
line source

#!/usr/bin/env python3


# SAT plugin for microbloging with roster access
# Copyright (C) 2009-2020 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 implementer

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(
                _(
                    "Server is not able to manage item-access pubsub, we can't use group blog"
                )
            )
        else:
            client.server_groupblog_available = True
            log.info(_("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:
            opt = self._p.OPT_ROSTER_GROUPS_ALLOWED
            microblog_data['groups'] = config_form.fields[opt].values

    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 = mb_data.get('groups', [])
        if not groups:
            return
        if not client.server_groupblog_available:
            raise exceptions.CancelError("GroupBlog is not available")
        log.debug("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] = mb_data['groups']

@implementer(iwokkel.IDisco)
class GroupBlog_handler(XMPPHandler):

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

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