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"""
SleekXMPP: The Sleek XMPP Library
Copyright (C) 2011 Nathanael C. Fritz, Lance J.T. Stout
This file is part of SleekXMPP.
See the file LICENSE for copying permission.
"""
import logging
from sleekxmpp.stanza import Message, Presence, Iq
from sleekxmpp.exceptions import XMPPError
from sleekxmpp.xmlstream import register_stanza_plugin
from sleekxmpp.xmlstream.handler import Callback
from sleekxmpp.xmlstream.matcher import StanzaPath
from sleekxmpp.plugins.base import base_plugin
from sleekxmpp.plugins.xep_0066 import stanza
log = logging.getLogger(__name__)
class xep_0066(base_plugin):
"""
XEP-0066: Out-of-Band Data
Out-of-Band Data is a basic method for transferring files between
XMPP agents. The URL of the resource in question is sent to the receiving
entity, which then downloads the resource before responding to the OOB
request. OOB is also used as a generic means to transmit URLs in other
stanzas to indicate where to find additional information.
Also see <http://www.xmpp.org/extensions/xep-0066.html>.
Events:
oob_transfer -- Raised when a request to download a resource
has been received.
Methods:
send_oob -- Send a request to another entity to download a file
or other addressable resource.
"""
def plugin_init(self):
"""Start the XEP-0066 plugin."""
self.xep = '0066'
self.description = 'Out-of-Band Transfer'
self.stanza = stanza
self.url_handlers = {'global': self._default_handler,
'jid': {}}
register_stanza_plugin(Iq, stanza.OOBTransfer)
register_stanza_plugin(Message, stanza.OOB)
register_stanza_plugin(Presence, stanza.OOB)
self.xmpp.register_handler(
Callback('OOB Transfer',
StanzaPath('iq@type=set/oob_transfer'),
self._handle_transfer))
def post_init(self):
"""Handle cross-plugin dependencies."""
base_plugin.post_init(self)
self.xmpp['xep_0030'].add_feature(stanza.OOBTransfer.namespace)
self.xmpp['xep_0030'].add_feature(stanza.OOB.namespace)
def register_url_handler(self, jid=None, handler=None):
"""
Register a handler to process download requests, either for all
JIDs or a single JID.
Arguments:
jid -- If None, then set the handler as a global default.
handler -- If None, then remove the existing handler for the
given JID, or reset the global handler if the JID
is None.
"""
if jid is None:
if handler is not None:
self.url_handlers['global'] = handler
else:
self.url_handlers['global'] = self._default_handler
else:
if handler is not None:
self.url_handlers['jid'][jid] = handler
else:
del self.url_handlers['jid'][jid]
def send_oob(self, to, url, desc=None, ifrom=None, **iqargs):
"""
Initiate a basic file transfer by sending the URL of
a file or other resource.
Arguments:
url -- The URL of the resource to transfer.
desc -- An optional human readable description of the item
that is to be transferred.
ifrom -- Specifiy the sender's JID.
block -- If true, block and wait for the stanzas' reply.
timeout -- The time in seconds to block while waiting for
a reply. If None, then wait indefinitely.
callback -- Optional callback to execute when a reply is
received instead of blocking and waiting for
the reply.
"""
iq = self.xmpp.Iq()
iq['type'] = 'set'
iq['to'] = to
iq['from'] = ifrom
iq['oob_transfer']['url'] = url
iq['oob_transfer']['desc'] = desc
return iq.send(**iqargs)
def _run_url_handler(self, iq):
"""
Execute the appropriate handler for a transfer request.
Arguments:
iq -- The Iq stanza containing the OOB transfer request.
"""
if iq['to'] in self.url_handlers['jid']:
return self.url_handlers['jid'][jid](iq)
else:
if self.url_handlers['global']:
self.url_handlers['global'](iq)
else:
raise XMPPError('service-unavailable')
def _default_handler(self, iq):
"""
As a safe default, don't actually download files.
Register a new handler using self.register_url_handler to
screen requests and download files.
Arguments:
iq -- The Iq stanza containing the OOB transfer request.
"""
raise XMPPError('service-unavailable')
def _handle_transfer(self, iq):
"""
Handle receiving an out-of-band transfer request.
Arguments:
iq -- An Iq stanza containing an OOB transfer request.
"""
log.debug('Received out-of-band data request for %s from %s:' % (
iq['oob_transfer']['url'], iq['from']))
self._run_url_handler(iq)
iq.reply().send()
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