view sat/plugins/plugin_exp_command_export.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 dcebc585c29f
line wrap: on
line source

#!/usr/bin/env python3


# SAT plugin to export commands (experimental)
# 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.words.protocols.jabber import jid
from twisted.internet import reactor, protocol

from sat.tools import trigger
from sat.tools.utils import clean_ustr

PLUGIN_INFO = {
    C.PI_NAME: "Command export plugin",
    C.PI_IMPORT_NAME: "EXP-COMMANS-EXPORT",
    C.PI_TYPE: "EXP",
    C.PI_PROTOCOLS: [],
    C.PI_DEPENDENCIES: [],
    C.PI_MAIN: "CommandExport",
    C.PI_HANDLER: "no",
    C.PI_DESCRIPTION: _("""Implementation of command export"""),
}


class ExportCommandProtocol(protocol.ProcessProtocol):
    """ Try to register an account with prosody """

    def __init__(self, parent, client, target, options):
        self.parent = parent
        self.target = target
        self.options = options
        self.client = client

    def _clean(self, data):
        if not data:
            log.error("data should not be empty !")
            return ""
        decoded = data.decode("utf-8", "ignore")[: -1 if data[-1] == "\n" else None]
        return clean_ustr(decoded)

    def connectionMade(self):
        log.info("connectionMade :)")

    def outReceived(self, data):
        self.client.sendMessage(self.target, {"": self._clean(data)}, no_trigger=True)

    def errReceived(self, data):
        self.client.sendMessage(self.target, {"": self._clean(data)}, no_trigger=True)

    def processEnded(self, reason):
        log.info("process finished: %d" % (reason.value.exitCode,))
        self.parent.removeProcess(self.target, self)

    def write(self, message):
        self.transport.write(message.encode("utf-8"))

    def boolOption(self, key):
        """ Get boolean value from options
        @param key: name of the option
        @return: True if key exists and set to "true" (case insensitive),
                 False in all other cases """
        value = self.options.get(key, "")
        return value.lower() == "true"


class CommandExport(object):
    """Command export plugin: export a command to an entity"""

    # XXX: This plugin can be potentially dangerous if we don't trust entities linked
    #      this is specially true if we have other triggers.
    # FIXME: spawned should be a client attribute, not a class one

    def __init__(self, host):
        log.info(_("Plugin command export initialization"))
        self.host = host
        self.spawned = {}  # key = entity
        host.trigger.add("MessageReceived", self.MessageReceivedTrigger, priority=10000)
        host.bridge.addMethod(
            "exportCommand",
            ".plugin",
            in_sign="sasasa{ss}s",
            out_sign="",
            method=self._exportCommand,
        )

    def removeProcess(self, entity, process):
        """ Called when the process is finished
        @param entity: jid.JID attached to the process
        @param process: process to remove"""
        try:
            processes_set = self.spawned[(entity, process.client.profile)]
            processes_set.discard(process)
            if not processes_set:
                del (self.spawned[(entity, process.client.profile)])
        except ValueError:
            pass

    def MessageReceivedTrigger(self, client, message_elt, post_treat):
        """ Check if source is linked and repeat message, else do nothing  """
        from_jid = jid.JID(message_elt["from"])
        spawned_key = (from_jid.userhostJID(), client.profile)

        if spawned_key in self.spawned:
            try:
                body = next(message_elt.elements(C.NS_CLIENT, "body"))
            except StopIteration:
                # do not block message without body (chat state notification...)
                return True

            mess_data = str(body) + "\n"
            processes_set = self.spawned[spawned_key]
            _continue = False
            exclusive = False
            for process in processes_set:
                process.write(mess_data)
                _continue &= process.boolOption("continue")
                exclusive |= process.boolOption("exclusive")
            if exclusive:
                raise trigger.SkipOtherTriggers
            return _continue

        return True

    def _exportCommand(self, command, args, targets, options, profile_key):
        """ Export a commands to authorised targets
        @param command: full path of the command to execute
        @param args: list of arguments, with command name as first one
        @param targets: list of allowed entities
        @param options: export options, a dict which can have the following keys ("true" to set booleans):
                        - exclusive: if set, skip all other triggers
                        - loop: if set, restart the command once terminated #TODO
                        - pty: if set, launch in a pseudo terminal
                        - continue: continue normal MessageReceived handling
        """
        client = self.host.getClient(profile_key)
        for target in targets:
            try:
                _jid = jid.JID(target)
                if not _jid.user or not _jid.host:
                    raise jid.InvalidFormat
                _jid = _jid.userhostJID()
            except (RuntimeError, jid.InvalidFormat, AttributeError):
                log.info("invalid target ignored: %s" % (target,))
                continue
            process_prot = ExportCommandProtocol(self, client, _jid, options)
            self.spawned.setdefault((_jid, client.profile), set()).add(process_prot)
            reactor.spawnProcess(
                process_prot, command, args, usePTY=process_prot.boolOption("pty")
            )