summaryrefslogtreecommitdiff
path: root/sleekxmpp/xmlstream/xmlstream.py
blob: 6ce89c25c26ffd5dc2e462537c746c997cb038d7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
"""
    SleekXMPP: The Sleek XMPP Library
    Copyright (C) 2010  Nathanael C. Fritz
    This file is part of SleekXMPP.

    See the file LICENSE for copying permission.
"""

from __future__ import with_statement, unicode_literals
try:
	import queue
except ImportError:
	import Queue as queue
from . import statemachine
from . stanzabase import StanzaBase
from xml.etree import cElementTree
from xml.parsers import expat
import logging
import socket
import threading
import time
import types
import copy
import xml.sax.saxutils
from . import scheduler

HANDLER_THREADS = 1

ssl_support = True
#try:
import ssl
#except ImportError:
#	ssl_support = False
import sys
if sys.version_info < (3, 0):
	#monkey patch broken filesocket object
	from . import filesocket
	#socket._fileobject = filesocket.filesocket
	

class RestartStream(Exception):
	pass

class CloseStream(Exception):
	pass

stanza_extensions = {}

class XMLStream(object):
	"A connection manager with XML events."

	def __init__(self, socket=None, host='', port=0, escape_quotes=False):
		global ssl_support
		self.ssl_support = ssl_support
		self.escape_quotes = escape_quotes
		self.state = statemachine.StateMachine()
		self.state.addStates({'connected':False, 'is client':False, 'ssl':False, 'tls':False, 'reconnect':True, 'processing':False, 'disconnecting':False}) #set initial states

		self.setSocket(socket)
		self.address = (host, int(port))

		self.__thread = {}

		self.__root_stanza = []
		self.__stanza = {}
		self.__stanza_extension = {}
		self.__handlers = []

		self.__tls_socket = None
		self.filesocket = None
		self.use_ssl = False
		self.use_tls = False

		self.stream_header = "<stream>"
		self.stream_footer = "</stream>"

		self.eventqueue = queue.Queue()
		self.sendqueue = queue.Queue()
		self.scheduler = scheduler.Scheduler(self.eventqueue)

		self.namespace_map = {}

		self.run = True
	
	def setSocket(self, socket):
		"Set the socket"
		self.socket = socket
		if socket is not None:
			self.filesocket = socket.makefile('rb', 0) # ElementTree.iterparse requires a file.  0 buffer files have to be binary
			self.state.set('connected', True)

	
	def setFileSocket(self, filesocket):
		self.filesocket = filesocket
	
	def connect(self, host='', port=0, use_ssl=False, use_tls=True):
		"Link to connectTCP"
		return self.connectTCP(host, port, use_ssl, use_tls)

	def connectTCP(self, host='', port=0, use_ssl=None, use_tls=None, reattempt=True):
		"Connect and create socket"
		while reattempt and not self.state['connected']:
			if host and port:
				self.address = (host, int(port))
			if use_ssl is not None:
				self.use_ssl = use_ssl
			if use_tls is not None:
				self.use_tls = use_tls
			self.state.set('is client', True)
			if sys.version_info < (3, 0):
				self.socket = filesocket.Socket26(socket.AF_INET, socket.SOCK_STREAM)
			else:
				self.socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
			self.socket.settimeout(None)
			if self.use_ssl and self.ssl_support:
				logging.debug("Socket Wrapped for SSL")
				self.socket = ssl.wrap_socket(self.socket)
			try:
				self.socket.connect(self.address)
				#self.filesocket = self.socket.makefile('rb', 0)
				self.filesocket = self.socket.makefile('rb', 0)
				self.state.set('connected', True)
				return True
			except socket.error as serr:
				logging.error("Could not connect. Socket Error #%s: %s" % (serr.errno, serr.strerror))
				time.sleep(1)
	
	def connectUnix(self, filepath):
		"Connect to Unix file and create socket"

	def startTLS(self):
		"Handshakes for TLS"
		if self.ssl_support:
			logging.info("Negotiating TLS")
			self.realsocket = self.socket
			self.socket = ssl.wrap_socket(self.socket, ssl_version=ssl.PROTOCOL_TLSv1, do_handshake_on_connect=False)
			self.socket.do_handshake()
			if sys.version_info < (3,0):
				from . filesocket import filesocket
				self.filesocket = filesocket(self.socket)
			else:
				self.filesocket = self.socket.makefile('rb', 0)
			return True
		else:
			logging.warning("Tried to enable TLS, but ssl module not found.")
			return False
		raise RestartStream()
	
	def process(self, threaded=True):
		self.scheduler.process(threaded=True)
		for t in range(0, HANDLER_THREADS):
			logging.debug("Starting HANDLER THREAD")
			self.__thread['eventhandle%s' % t] = threading.Thread(name='eventhandle%s' % t, target=self._eventRunner)
			self.__thread['eventhandle%s' % t].start()
		self.__thread['sendthread'] = threading.Thread(name='sendthread', target=self._sendThread)
		self.__thread['sendthread'].start()
		if threaded:
			self.__thread['process'] = threading.Thread(name='process', target=self._process)
			self.__thread['process'].start()
		else:
			self._process()
	
	def schedule(self, name, seconds, callback, args=None, kwargs=None, repeat=False):
		self.scheduler.add(name, seconds, callback, args, kwargs, repeat, qpointer=self.eventqueue)
	
	def _process(self):
		"Start processing the socket."
		firstrun = True
		while self.run and (firstrun or self.state['reconnect']):
			self.state.set('processing', True)
			firstrun = False
			try:
				if self.state['is client']:
					self.sendRaw(self.stream_header)
				while self.run and self.__readXML():
					if self.state['is client']:
						self.sendRaw(self.stream_header)
			except KeyboardInterrupt:
				logging.debug("Keyboard Escape Detected")
				self.state.set('processing', False)
				self.state.set('reconnect', False)
				self.disconnect()
				self.run = False
				self.scheduler.run = False
				self.eventqueue.put(('quit', None, None))
				return
			except CloseStream:
				return
			except SystemExit:
				self.eventqueue.put(('quit', None, None))
				return
			except socket.error:
				if not self.state.reconnect:
					return
				else:
					self.state.set('processing', False)
					logging.exception('Socket Error')
					self.disconnect(reconnect=True)
			except:
				if not self.state.reconnect:
					return
				else:
					self.state.set('processing', False)
					logging.exception('Connection error. Reconnecting.')
					self.disconnect(reconnect=True)
			if self.state['reconnect']:
				self.reconnect()
			self.state.set('processing', False)
			self.eventqueue.put(('quit', None, None))
		#self.__thread['readXML'] = threading.Thread(name='readXML', target=self.__readXML)
		#self.__thread['readXML'].start()
		#self.__thread['spawnEvents'] = threading.Thread(name='spawnEvents', target=self.__spawnEvents)
		#self.__thread['spawnEvents'].start()
	
	def __readXML(self):
		"Parses the incoming stream, adding to xmlin queue as it goes"
		#build cElementTree object from expat was we go
		#self.filesocket = self.socket.makefile('rb', 0)
		#print self.filesocket.read(1024) #self.filesocket._sock.recv(1024)
		edepth = 0
		root = None
		for (event, xmlobj) in cElementTree.iterparse(self.filesocket, (b'end', b'start')):
			if edepth == 0: # and xmlobj.tag.split('}', 1)[-1] == self.basetag:
				if event == b'start':
					root = xmlobj
					self.start_stream_handler(root)
			if event == b'end':
				edepth += -1
				if edepth == 0 and event == b'end':
					self.disconnect(reconnect=self.state['reconnect'])
					logging.debug("Ending readXML loop")
					return False
				elif edepth == 1:
					#self.xmlin.put(xmlobj)
					try:
						self.__spawnEvent(xmlobj)
					except RestartStream:
						return True
					except CloseStream:
						logging.debug("Ending readXML loop")
						return False
					if root:
						root.clear()
			if event == b'start':
				edepth += 1
		logging.debug("Ending readXML loop")
	
	def _sendThread(self):
		while self.run:
			data = self.sendqueue.get(True)
			logging.debug("SEND: %s" % data)
			try:
				self.socket.send(data.encode('utf-8'))
				#self.socket.send(bytes(data, "utf-8"))
				#except socket.error,(errno, strerror):
			except:
				logging.warning("Failed to send %s" % data)
				self.state.set('connected', False)
				if self.state.reconnect:
					logging.exception("Disconnected. Socket Error.")
					self.disconnect(reconnect=True)
	
	def sendRaw(self, data):
		self.sendqueue.put(data)
		return True
	
	def disconnect(self, reconnect=False):
		self.state.set('reconnect', reconnect)
		if self.state['disconnecting']:
			return
		if not self.state['reconnect']:
			logging.debug("Disconnecting...")
			self.state.set('disconnecting', True)
			self.run = False
			self.scheduler.run = False
		if self.state['connected']:
			self.sendRaw(self.stream_footer)
			time.sleep(1)
			#send end of stream
			#wait for end of stream back
		try:
			self.socket.close()
			self.filesocket.close()
			self.socket.shutdown(socket.SHUT_RDWR)
		except socket.error as serr:
			#logging.warning("Error while disconnecting. Socket Error #%s: %s" % (errno, strerror))
			#thread.exit_thread()
			pass
		if self.state['processing']:
			#raise CloseStream
			pass
	
	def reconnect(self):
		self.state.set('tls',False)
		self.state.set('ssl',False)
		time.sleep(1)
		self.connect()
	
	def incoming_filter(self, xmlobj):
		return xmlobj
		
	def __spawnEvent(self, xmlobj):
		"watching xmlOut and processes handlers"
		#convert XML into Stanza
		logging.debug("RECV: %s" % cElementTree.tostring(xmlobj))
		xmlobj = self.incoming_filter(xmlobj)
		stanza_type = StanzaBase
		for stanza_class in self.__root_stanza:
			if xmlobj.tag == "{%s}%s" % (self.default_ns, stanza_class.name):
				stanza_type = stanza_class
				break
		unhandled = True
		stanza = stanza_type(self, xmlobj)
		for handler in self.__handlers:
			if handler.match(stanza):
				stanza_copy = stanza_type(self, copy.deepcopy(xmlobj))
				handler.prerun(stanza_copy)
				self.eventqueue.put(('stanza', handler, stanza_copy))
				if handler.checkDelete(): self.__handlers.pop(self.__handlers.index(handler))
				unhandled = False
		if unhandled:
			stanza.unhandled()
			#loop through handlers and test match
			#spawn threads as necessary, call handlers, sending Stanza
	
	def _eventRunner(self):
		logging.debug("Loading event runner")
		while self.run:
			try:
				event = self.eventqueue.get(True, timeout=5)
			except queue.Empty:
				event = None
			except KeyboardInterrupt:
				self.run = False
				self.scheduler.run = False
			if event is not None:
				etype = event[0]
				handler = event[1]
				args = event[2:]
				#etype, handler, *args = event  #python 3.x way
				if etype == 'stanza':
					try:
						handler.run(args[0])
					except Exception as e:
						logging.exception('Error processing event handler: %s' % handler.name)
						args[0].exception(e)
				elif etype == 'schedule':
					try:
						logging.debug(args)
						handler(*args[0])
					except:
						logging.exception('Error processing scheduled task')
				elif etype == 'quit':
					logging.debug("Quitting eventRunner thread")
					return False
	
	def registerHandler(self, handler, before=None, after=None):
		"Add handler with matcher class and parameters."
		self.__handlers.append(handler)
	
	def removeHandler(self, name):
		"Removes the handler."
		idx = 0
		for handler in self.__handlers:
			if handler.name == name:
				self.__handlers.pop(idx)
				return
			idx += 1
	
	def registerStanza(self, stanza_class):
		"Adds stanza.  If root stanzas build stanzas sent in events while non-root stanzas build substanza objects."
		self.__root_stanza.append(stanza_class)
	
	def registerStanzaExtension(self, stanza_class, stanza_extension):
		if stanza_class not in stanza_extensions:
			stanza_extensions[stanza_class] = [stanza_extension]
		else:
			stanza_extensions[stanza_class].append(stanza_extension)
	
	def removeStanza(self, stanza_class, root=False):
		"Removes the stanza's registration."
		if root:
			del self.__root_stanza[stanza_class]
		else:
			del self.__stanza[stanza_class]
	
	def removeStanzaExtension(self, stanza_class, stanza_extension):
		stanza_extension[stanza_class].pop(stanza_extension)

	def tostring(self, xml, xmlns='', stringbuffer=''):
		newoutput = [stringbuffer]
		#TODO respect ET mapped namespaces
		itag = xml.tag.split('}', 1)[-1]
		if '}' in xml.tag:
			ixmlns = xml.tag.split('}', 1)[0][1:]
		else:
			ixmlns = ''
		nsbuffer = ''
		if xmlns != ixmlns and ixmlns != '':
			if ixmlns in self.namespace_map:
				if self.namespace_map[ixmlns] != '':
					itag = "%s:%s" % (self.namespace_map[ixmlns], itag)
			else:
				nsbuffer = """ xmlns="%s\"""" % ixmlns
		newoutput.append("<%s" % itag)
		newoutput.append(nsbuffer)
		for attrib in xml.attrib:
			newoutput.append(""" %s="%s\"""" % (attrib, self.xmlesc(xml.attrib[attrib])))
		if len(xml) or xml.text or xml.tail:
			newoutput.append(">")
			if xml.text:
				newoutput.append(self.xmlesc(xml.text))
			if len(xml):
				for child in xml.getchildren():
					newoutput.append(self.tostring(child, ixmlns))
			newoutput.append("</%s>" % (itag, ))
			if xml.tail:
				newoutput.append(self.xmlesc(xml.tail))
		elif xml.text:
			newoutput.append(">%s</%s>" % (self.xmlesc(xml.text), itag))
		else:
			newoutput.append(" />")
		return ''.join(newoutput)

	def xmlesc(self, text):
		text = list(text)
		cc = 0
		matches = ('&', '<', '"', '>', "'")
		for c in text:
			if c in matches:
				if c == '&':
					text[cc] = '&amp;'
				elif c == '<':
					text[cc] = '&lt;'
				elif c == '>':
					text[cc] = '&gt;'
				elif c == "'":
					text[cc] = '&apos;'
				elif self.escape_quotes:
					text[cc] = '&quot;'
			cc += 1
		return ''.join(text)
	
	def start_stream_handler(self, xml):
		"""Meant to be overridden"""
		pass