614 lines
22 KiB
Python
614 lines
22 KiB
Python
"""
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SleekXMPP: The Sleek XMPP Library
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Copyright (C) 2011 Nathanael C. Fritz, Lance J.T. Stout
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This file is part of SleekXMPP.
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See the file LICENSE for copying permission.
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"""
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import logging
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import time
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from sleekxmpp import Iq
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from sleekxmpp.exceptions import IqError
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from sleekxmpp.xmlstream.handler import Callback
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from sleekxmpp.xmlstream.matcher import StanzaPath
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from sleekxmpp.xmlstream import register_stanza_plugin, JID
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from sleekxmpp.plugins.base import base_plugin
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from sleekxmpp.plugins.xep_0050 import stanza
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from sleekxmpp.plugins.xep_0050 import Command
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from sleekxmpp.plugins.xep_0004 import Form
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log = logging.getLogger(__name__)
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class xep_0050(base_plugin):
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"""
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XEP-0050: Ad-Hoc Commands
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XMPP's Adhoc Commands provides a generic workflow mechanism for
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interacting with applications. The result is similar to menu selections
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and multi-step dialogs in normal desktop applications. Clients do not
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need to know in advance what commands are provided by any particular
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application or agent. While adhoc commands provide similar functionality
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to Jabber-RPC, adhoc commands are used primarily for human interaction.
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Also see <http://xmpp.org/extensions/xep-0050.html>
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Configuration Values:
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threaded -- Indicates if command events should be threaded.
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Defaults to True.
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Events:
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command_execute -- Received a command with action="execute"
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command_next -- Received a command with action="next"
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command_complete -- Received a command with action="complete"
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command_cancel -- Received a command with action="cancel"
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Attributes:
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threaded -- Indicates if command events should be threaded.
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Defaults to True.
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commands -- A dictionary mapping JID/node pairs to command
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names and handlers.
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sessions -- A dictionary or equivalent backend mapping
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session IDs to dictionaries containing data
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relevant to a command's session.
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Methods:
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plugin_init -- Overrides base_plugin.plugin_init
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post_init -- Overrides base_plugin.post_init
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new_session -- Return a new session ID.
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prep_handlers -- Placeholder. May call with a list of handlers
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to prepare them for use with the session storage
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backend, if needed.
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set_backend -- Replace the default session storage with some
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external storage mechanism, such as a database.
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The provided backend wrapper must be able to
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act using the same syntax as a dictionary.
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add_command -- Add a command for use by external entitites.
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get_commands -- Retrieve a list of commands provided by a
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remote agent.
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send_command -- Send a command request to a remote agent.
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start_command -- Command user API: initiate a command session
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continue_command -- Command user API: proceed to the next step
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cancel_command -- Command user API: cancel a command
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complete_command -- Command user API: finish a command
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terminate_command -- Command user API: delete a command's session
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"""
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def plugin_init(self):
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"""Start the XEP-0050 plugin."""
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self.xep = '0050'
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self.description = 'Ad-Hoc Commands'
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self.stanza = stanza
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self.threaded = self.config.get('threaded', True)
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self.commands = {}
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self.sessions = self.config.get('session_db', {})
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self.xmpp.register_handler(
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Callback("Ad-Hoc Execute",
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StanzaPath('iq@type=set/command'),
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self._handle_command))
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register_stanza_plugin(Iq, Command)
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register_stanza_plugin(Command, Form)
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self.xmpp.add_event_handler('command_execute',
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self._handle_command_start,
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threaded=self.threaded)
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self.xmpp.add_event_handler('command_next',
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self._handle_command_next,
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threaded=self.threaded)
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self.xmpp.add_event_handler('command_cancel',
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self._handle_command_cancel,
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threaded=self.threaded)
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self.xmpp.add_event_handler('command_complete',
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self._handle_command_complete,
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threaded=self.threaded)
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def post_init(self):
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"""Handle cross-plugin interactions."""
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base_plugin.post_init(self)
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self.xmpp['xep_0030'].add_feature(Command.namespace)
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def set_backend(self, db):
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"""
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Replace the default session storage dictionary with
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a generic, external data storage mechanism.
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The replacement backend must be able to interact through
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the same syntax and interfaces as a normal dictionary.
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Arguments:
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db -- The new session storage mechanism.
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"""
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self.sessions = db
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def prep_handlers(self, handlers, **kwargs):
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"""
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Prepare a list of functions for use by the backend service.
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Intended to be replaced by the backend service as needed.
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Arguments:
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handlers -- A list of function pointers
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**kwargs -- Any additional parameters required by the backend.
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"""
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pass
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# =================================================================
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# Server side (command provider) API
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def add_command(self, jid=None, node=None, name='', handler=None):
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"""
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Make a new command available to external entities.
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Access control may be implemented in the provided handler.
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Command workflow is done across a sequence of command handlers. The
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first handler is given the initial Iq stanza of the request in order
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to support access control. Subsequent handlers are given only the
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payload items of the command. All handlers will receive the command's
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session data.
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Arguments:
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jid -- The JID that will expose the command.
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node -- The node associated with the command.
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name -- A human readable name for the command.
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handler -- A function that will generate the response to the
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initial command request, as well as enforcing any
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access control policies.
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"""
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if jid is None:
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jid = self.xmpp.boundjid
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elif not isinstance(jid, JID):
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jid = JID(jid)
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item_jid = jid.full
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# Client disco uses only the bare JID
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if self.xmpp.is_component:
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jid = jid.full
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else:
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jid = jid.bare
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self.xmpp['xep_0030'].add_identity(category='automation',
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itype='command-list',
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name='Ad-Hoc commands',
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node=Command.namespace,
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jid=jid)
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self.xmpp['xep_0030'].add_item(jid=item_jid,
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name=name,
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node=Command.namespace,
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subnode=node,
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ijid=jid)
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self.xmpp['xep_0030'].add_identity(category='automation',
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itype='command-node',
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name=name,
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node=node,
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jid=jid)
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self.xmpp['xep_0030'].add_feature(Command.namespace, None, jid)
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self.commands[(item_jid, node)] = (name, handler)
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def new_session(self):
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"""Return a new session ID."""
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return str(time.time()) + '-' + self.xmpp.new_id()
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def _handle_command(self, iq):
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"""Raise command events based on the command action."""
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self.xmpp.event('command_%s' % iq['command']['action'], iq)
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def _handle_command_start(self, iq):
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"""
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Process an initial request to execute a command.
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Arguments:
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iq -- The command execution request.
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"""
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sessionid = self.new_session()
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node = iq['command']['node']
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key = (iq['to'].full, node)
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name, handler = self.commands.get(key, ('Not found', None))
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if not handler:
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log.debug('Command not found: %s, %s', key, self.commands)
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initial_session = {'id': sessionid,
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'from': iq['from'],
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'to': iq['to'],
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'node': node,
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'payload': None,
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'interfaces': '',
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'payload_classes': None,
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'notes': None,
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'has_next': False,
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'allow_complete': False,
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'allow_prev': False,
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'past': [],
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'next': None,
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'prev': None,
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'cancel': None}
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session = handler(iq, initial_session)
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self._process_command_response(iq, session)
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def _handle_command_next(self, iq):
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"""
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Process a request for the next step in the workflow
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for a command with multiple steps.
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Arguments:
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iq -- The command continuation request.
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"""
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sessionid = iq['command']['sessionid']
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session = self.sessions[sessionid]
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handler = session['next']
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interfaces = session['interfaces']
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results = []
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for stanza in iq['command']['substanzas']:
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if stanza.plugin_attrib in interfaces:
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results.append(stanza)
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if len(results) == 1:
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results = results[0]
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session = handler(results, session)
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self._process_command_response(iq, session)
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def _process_command_response(self, iq, session):
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"""
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Generate a command reply stanza based on the
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provided session data.
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Arguments:
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iq -- The command request stanza.
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session -- A dictionary of relevant session data.
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"""
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sessionid = session['id']
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payload = session['payload']
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if not isinstance(payload, list):
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payload = [payload]
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session['interfaces'] = [item.plugin_attrib for item in payload]
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session['payload_classes'] = [item.__class__ for item in payload]
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self.sessions[sessionid] = session
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for item in payload:
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register_stanza_plugin(Command, item.__class__, iterable=True)
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iq.reply()
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iq['command']['node'] = session['node']
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iq['command']['sessionid'] = session['id']
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if session['next'] is None:
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iq['command']['actions'] = []
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iq['command']['status'] = 'completed'
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elif session['has_next']:
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actions = ['next']
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if session['allow_complete']:
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actions.append('complete')
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if session['allow_prev']:
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actions.append('prev')
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iq['command']['actions'] = actions
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iq['command']['status'] = 'executing'
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else:
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iq['command']['actions'] = ['complete']
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iq['command']['status'] = 'executing'
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iq['command']['notes'] = session['notes']
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for item in payload:
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iq['command'].append(item)
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iq.send()
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def _handle_command_cancel(self, iq):
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"""
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Process a request to cancel a command's execution.
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Arguments:
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iq -- The command cancellation request.
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"""
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node = iq['command']['node']
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sessionid = iq['command']['sessionid']
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session = self.sessions[sessionid]
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handler = session['cancel']
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if handler:
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handler(iq, session)
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try:
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del self.sessions[sessionid]
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except:
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pass
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iq.reply()
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iq['command']['node'] = node
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iq['command']['sessionid'] = sessionid
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iq['command']['status'] = 'canceled'
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iq['command']['notes'] = session['notes']
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iq.send()
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def _handle_command_complete(self, iq):
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"""
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Process a request to finish the execution of command
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and terminate the workflow.
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All data related to the command session will be removed.
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Arguments:
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iq -- The command completion request.
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"""
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node = iq['command']['node']
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sessionid = iq['command']['sessionid']
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session = self.sessions[sessionid]
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handler = session['next']
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interfaces = session['interfaces']
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results = []
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for stanza in iq['command']['substanzas']:
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if stanza.plugin_attrib in interfaces:
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results.append(stanza)
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if len(results) == 1:
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results = results[0]
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if handler:
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handler(results, session)
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iq.reply()
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iq['command']['node'] = node
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iq['command']['sessionid'] = sessionid
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iq['command']['actions'] = []
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iq['command']['status'] = 'completed'
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iq['command']['notes'] = session['notes']
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iq.send()
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del self.sessions[sessionid]
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# =================================================================
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# Client side (command user) API
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def get_commands(self, jid, **kwargs):
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"""
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Return a list of commands provided by a given JID.
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Arguments:
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jid -- The JID to query for commands.
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local -- If true, then the query is for a JID/node
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combination handled by this Sleek instance and
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no stanzas need to be sent.
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Otherwise, a disco stanza must be sent to the
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remove JID to retrieve the items.
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ifrom -- Specifiy the sender's JID.
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block -- If true, block and wait for the stanzas' reply.
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timeout -- The time in seconds to block while waiting for
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a reply. If None, then wait indefinitely.
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callback -- Optional callback to execute when a reply is
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received instead of blocking and waiting for
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the reply.
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iterator -- If True, return a result set iterator using
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the XEP-0059 plugin, if the plugin is loaded.
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Otherwise the parameter is ignored.
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"""
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return self.xmpp['xep_0030'].get_items(jid=jid,
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node=Command.namespace,
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**kwargs)
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def send_command(self, jid, node, ifrom=None, action='execute',
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payload=None, sessionid=None, flow=False, **kwargs):
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"""
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Create and send a command stanza, without using the provided
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workflow management APIs.
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Arguments:
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jid -- The JID to send the command request or result.
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node -- The node for the command.
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ifrom -- Specify the sender's JID.
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action -- May be one of: execute, cancel, complete,
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or cancel.
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payload -- Either a list of payload items, or a single
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payload item such as a data form.
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sessionid -- The current session's ID value.
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flow -- If True, process the Iq result using the
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command workflow methods contained in the
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session instead of returning the response
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stanza itself. Defaults to False.
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block -- Specify if the send call will block until a
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response is received, or a timeout occurs.
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Defaults to True.
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timeout -- The length of time (in seconds) to wait for a
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response before exiting the send call
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if blocking is used. Defaults to
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sleekxmpp.xmlstream.RESPONSE_TIMEOUT
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callback -- Optional reference to a stream handler
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function. Will be executed when a reply
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stanza is received if flow=False.
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"""
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iq = self.xmpp.Iq()
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iq['type'] = 'set'
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iq['to'] = jid
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iq['from'] = ifrom
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iq['command']['node'] = node
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iq['command']['action'] = action
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if sessionid is not None:
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iq['command']['sessionid'] = sessionid
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if payload is not None:
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if not isinstance(payload, list):
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payload = [payload]
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for item in payload:
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iq['command'].append(item)
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if not flow:
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return iq.send(**kwargs)
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else:
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if kwargs.get('block', True):
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try:
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result = iq.send(**kwargs)
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except IqError as err:
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result = err.iq
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self._handle_command_result(result)
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else:
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iq.send(block=False, callback=self._handle_command_result)
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def start_command(self, jid, node, session, ifrom=None, block=False):
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"""
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Initiate executing a command provided by a remote agent.
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The default workflow provided is non-blocking, but a blocking
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version may be used with block=True.
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The provided session dictionary should contain:
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next -- A handler for processing the command result.
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error -- A handler for processing any error stanzas
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generated by the request.
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Arguments:
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jid -- The JID to send the command request.
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node -- The node for the desired command.
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session -- A dictionary of relevant session data.
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ifrom -- Optionally specify the sender's JID.
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block -- If True, block execution until a result
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is received. Defaults to False.
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"""
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session['jid'] = jid
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session['node'] = node
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session['timestamp'] = time.time()
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session['payload'] = None
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session['block'] = block
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iq = self.xmpp.Iq()
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iq['type'] = 'set'
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iq['to'] = jid
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iq['from'] = ifrom
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session['from'] = ifrom
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iq['command']['node'] = node
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iq['command']['action'] = 'execute'
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sessionid = 'client:pending_' + iq['id']
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session['id'] = sessionid
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self.sessions[sessionid] = session
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if session['block']:
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try:
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result = iq.send(block=True)
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except IqError as err:
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result = err.iq
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self._handle_command_result(result)
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else:
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iq.send(block=False, callback=self._handle_command_result)
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def continue_command(self, session):
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"""
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Execute the next action of the command.
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Arguments:
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session -- All stored data relevant to the current
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command session.
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"""
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sessionid = 'client:' + session['id']
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self.sessions[sessionid] = session
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self.send_command(session['jid'],
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session['node'],
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ifrom=session.get('from', None),
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action='next',
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payload=session.get('payload', None),
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sessionid=session['id'],
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flow=True,
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block=session['block'])
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def cancel_command(self, session):
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"""
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Cancel the execution of a command.
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Arguments:
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session -- All stored data relevant to the current
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command session.
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"""
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sessionid = 'client:' + session['id']
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self.sessions[sessionid] = session
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self.send_command(session['jid'],
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session['node'],
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ifrom=session.get('from', None),
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action='cancel',
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payload=session.get('payload', None),
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sessionid=session['id'],
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flow=True,
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block=session['block'])
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def complete_command(self, session):
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"""
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Finish the execution of a command workflow.
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Arguments:
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session -- All stored data relevant to the current
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command session.
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"""
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sessionid = 'client:' + session['id']
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self.sessions[sessionid] = session
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self.send_command(session['jid'],
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session['node'],
|
|
ifrom=session.get('from', None),
|
|
action='complete',
|
|
payload=session.get('payload', None),
|
|
sessionid=session['id'],
|
|
flow=True,
|
|
block=session['block'])
|
|
|
|
def terminate_command(self, session):
|
|
"""
|
|
Delete a command's session after a command has completed
|
|
or an error has occured.
|
|
|
|
Arguments:
|
|
session -- All stored data relevant to the current
|
|
command session.
|
|
"""
|
|
try:
|
|
del self.sessions[session['id']]
|
|
except:
|
|
pass
|
|
|
|
def _handle_command_result(self, iq):
|
|
"""
|
|
Process the results of a command request.
|
|
|
|
Will execute the 'next' handler stored in the session
|
|
data, or the 'error' handler depending on the Iq's type.
|
|
|
|
Arguments:
|
|
iq -- The command response.
|
|
"""
|
|
sessionid = 'client:' + iq['command']['sessionid']
|
|
pending = False
|
|
|
|
if sessionid not in self.sessions:
|
|
pending = True
|
|
pendingid = 'client:pending_' + iq['id']
|
|
if pendingid not in self.sessions:
|
|
return
|
|
sessionid = pendingid
|
|
|
|
session = self.sessions[sessionid]
|
|
sessionid = 'client:' + iq['command']['sessionid']
|
|
session['id'] = iq['command']['sessionid']
|
|
|
|
self.sessions[sessionid] = session
|
|
|
|
if pending:
|
|
del self.sessions[pendingid]
|
|
|
|
handler_type = 'next'
|
|
if iq['type'] == 'error':
|
|
handler_type = 'error'
|
|
handler = session.get(handler_type, None)
|
|
if handler:
|
|
handler(iq, session)
|
|
elif iq['type'] == 'error':
|
|
self.terminate_command(session)
|
|
|
|
if iq['command']['status'] == 'completed':
|
|
self.terminate_command(session)
|