view sat/plugins/plugin_exp_parrot.py @ 2646:712cb4ff3e13

core: new EncryptionHandler class which manage encrypted session as a core feature: Plugin handling encryption can now register using host.registerEncryptionPlugin, and an encryption session can now be started using messageEncryptionStart bridge method. This will make encryption handling more easy, as we now know if a session is clear or e2e encrypted, and which plugin handle it.
author Goffi <goffi@goffi.org>
date Sun, 29 Jul 2018 19:22:56 +0200
parents 56f94936df1e
children 003b8b4b56a7
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#!/usr/bin/env python2
# -*- coding: utf-8 -*-

# SAT plugin for parrot mode (experimental)
# Copyright (C) 2009-2018 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.words.protocols.jabber import jid

from sat.core.exceptions import UnknownEntityError

# from sat.tools import trigger

PLUGIN_INFO = {
    C.PI_NAME: "Parrot Plugin",
    C.PI_IMPORT_NAME: "EXP-PARROT",
    C.PI_TYPE: "EXP",
    C.PI_PROTOCOLS: [],
    C.PI_DEPENDENCIES: ["XEP-0045"],
    C.PI_RECOMMENDATIONS: [C.TEXT_CMDS],
    C.PI_MAIN: "Exp_Parrot",
    C.PI_HANDLER: "no",
    C.PI_DESCRIPTION: _(
        u"""Implementation of parrot mode (repeat messages between 2 entities)"""
    ),
}


class Exp_Parrot(object):
    """Parrot mode plugin: repeat messages from one entity or MUC room to another one"""

    # XXX: This plugin can be potentially dangerous if we don't trust entities linked
    #      this is specially true if we have other triggers.
    #      sendMessageTrigger avoid other triggers execution, it's deactivated to allow
    #      /unparrot command in text commands plugin.
    # FIXME: potentially unsecure, specially with e2e encryption

    def __init__(self, host):
        log.info(_("Plugin Parrot initialization"))
        self.host = host
        host.trigger.add("MessageReceived", self.MessageReceivedTrigger, priority=100)
        # host.trigger.add("sendMessage", self.sendMessageTrigger, priority=100)
        try:
            self.host.plugins[C.TEXT_CMDS].registerTextCommands(self)
        except KeyError:
            log.info(_(u"Text commands not available"))

    # def sendMessageTrigger(self, client, mess_data, treatments):
    #    """ Deactivate other triggers if recipient is in parrot links """
    #    try:
    #        _links = client.parrot_links
    #    except AttributeError:
    #        return True
    #
    #    if mess_data['to'].userhostJID() in _links.values():
    #        log.debug("Parrot link detected, skipping other triggers")
    #        raise trigger.SkipOtherTriggers

    def MessageReceivedTrigger(self, client, message_elt, post_treat):
        """ Check if source is linked and repeat message, else do nothing  """
        # TODO: many things are not repeated (subject, thread, etc)
        profile = client.profile
        client = self.host.getClient(profile)
        from_jid = message_elt["from"]

        try:
            _links = client.parrot_links
        except AttributeError:
            return True

        if not from_jid.userhostJID() in _links:
            return True

        message = {}
        for e in message_elt.elements(C.NS_CLIENT, "body"):
            body = unicode(e)
            lang = e.getAttribute("lang") or ""

            try:
                entity_type = self.host.memory.getEntityData(from_jid, ["type"], profile)[
                    "type"
                ]
            except (UnknownEntityError, KeyError):
                entity_type = "contact"
            if entity_type == "chatroom":
                src_txt = from_jid.resource
                if src_txt == self.host.plugins["XEP-0045"].getRoomNick(
                    client, from_jid.userhostJID()
                ):
                    # we won't repeat our own messages
                    return True
            else:
                src_txt = from_jid.user
            message[lang] = u"[{}] {}".format(src_txt, body)

            linked = _links[from_jid.userhostJID()]

            client.sendMessage(
                jid.JID(unicode(linked)), message, None, "auto", no_trigger=True
            )

        return True

    def addParrot(self, client, source_jid, dest_jid):
        """Add a parrot link from one entity to another one

        @param source_jid: entity from who messages will be repeated
        @param dest_jid: entity where the messages will be repeated
        """
        try:
            _links = client.parrot_links
        except AttributeError:
            _links = client.parrot_links = {}

        _links[source_jid.userhostJID()] = dest_jid
        log.info(
            u"Parrot mode: %s will be repeated to %s"
            % (source_jid.userhost(), unicode(dest_jid))
        )

    def removeParrot(self, client, source_jid):
        """Remove parrot link

        @param source_jid: this entity will no more be repeated
        """
        try:
            del client.parrot_links[source_jid.userhostJID()]
        except (AttributeError, KeyError):
            pass

    def cmd_parrot(self, client, mess_data):
        """activate Parrot mode between 2 entities, in both directions."""
        log.debug("Catched parrot command")
        txt_cmd = self.host.plugins[C.TEXT_CMDS]

        try:
            link_left_jid = jid.JID(mess_data["unparsed"].strip())
            if not link_left_jid.user or not link_left_jid.host:
                raise jid.InvalidFormat
        except (RuntimeError, jid.InvalidFormat, AttributeError):
            txt_cmd.feedBack(
                client, "Can't activate Parrot mode for invalid jid", mess_data
            )
            return False

        link_right_jid = mess_data["to"]

        self.addParrot(client, link_left_jid, link_right_jid)
        self.addParrot(client, link_right_jid, link_left_jid)

        txt_cmd.feedBack(
            client,
            "Parrot mode activated for {}".format(unicode(link_left_jid)),
            mess_data,
        )

        return False

    def cmd_unparrot(self, client, mess_data):
        """remove Parrot mode between 2 entities, in both directions."""
        log.debug("Catched unparrot command")
        txt_cmd = self.host.plugins[C.TEXT_CMDS]

        try:
            link_left_jid = jid.JID(mess_data["unparsed"].strip())
            if not link_left_jid.user or not link_left_jid.host:
                raise jid.InvalidFormat
        except jid.InvalidFormat:
            txt_cmd.feedBack(
                client, u"Can't deactivate Parrot mode for invalid jid", mess_data
            )
            return False

        link_right_jid = mess_data["to"]

        self.removeParrot(client, link_left_jid)
        self.removeParrot(client, link_right_jid)

        txt_cmd.feedBack(
            client,
            u"Parrot mode deactivated for {} and {}".format(
                unicode(link_left_jid), unicode(link_right_jid)
            ),
            mess_data,
        )

        return False