Fix XEP-0078 using the new stream feature workflow.

Honestly, this is mainly just a demo/proof of concept that we
can handle dependencies and ordering issues with stream features.

DON'T use XEP-0078 if you are able to use the normal SASL method,
which should be the case unless you are dealing with a very old
XMPP server implementation.

5 files changed, 165 insertions, 72 deletions

diff --git a/sleekxmpp/plugins/__init__.py b/sleekxmpp/plugins/__init__.py
index 7fa031ef..c0b1121b 100644
--- a/sleekxmpp/plugins/__init__.py
+++ b/sleekxmpp/plugins/__init__.py
@@ -9,3 +9,5 @@ __all__ = ['xep_0004', 'xep_0009', 'xep_0012', 'xep_0030', 'xep_0033',
            'xep_0045', 'xep_0050', 'xep_0060', 'xep_0066', 'xep_0082',
            'xep_0085', 'xep_0086', 'xep_0092', 'xep_0128', 'xep_0199',
            'xep_0203', 'xep_0224', 'xep_0249', 'gmail_notify']
+
+# Don't automatically load xep_0078
diff --git a/sleekxmpp/plugins/xep_0078.py b/sleekxmpp/plugins/xep_0078.py
deleted file mode 100644
index bb6a4632..00000000
--- a/sleekxmpp/plugins/xep_0078.py
+++ /dev/null
@@ -1,72 +0,0 @@
-"""
-    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
-from xml.etree import cElementTree as ET
-import logging
-import hashlib
-from . import base
-
-
-log = logging.getLogger(__name__)
-
-
-class xep_0078(base.base_plugin):
-	"""
-	XEP-0078 NON-SASL Authentication
-	"""
-	def plugin_init(self):
-		self.description = "Non-SASL Authentication (broken)"
-		self.xep = "0078"
-		self.xmpp.add_event_handler("session_start", self.check_stream)
-		#disabling until I fix conflict with PLAIN
-		#self.xmpp.registerFeature("<auth xmlns='http://jabber.org/features/iq-auth'/>", self.auth)
-		self.streamid = ''
-
-	def check_stream(self, xml):
-		self.streamid = xml.attrib['id']
-		if xml.get('version', '0') != '1.0':
-			self.auth()
-
-	def auth(self, xml=None):
-		log.debug("Starting jabber:iq:auth Authentication")
-		auth_request = self.xmpp.makeIqGet()
-		auth_request_query = ET.Element('{jabber:iq:auth}query')
-		auth_request.attrib['to'] = self.xmpp.boundjid.host
-		username = ET.Element('username')
-		username.text = self.xmpp.username
-		auth_request_query.append(username)
-		auth_request.append(auth_request_query)
-		result = auth_request.send()
-		rquery = result.find('{jabber:iq:auth}query')
-		attempt = self.xmpp.makeIqSet()
-		query = ET.Element('{jabber:iq:auth}query')
-		resource = ET.Element('resource')
-		resource.text = self.xmpp.resource
-		query.append(username)
-		query.append(resource)
-		if rquery.find('{jabber:iq:auth}digest') is None:
-			log.warning("Authenticating via jabber:iq:auth Plain.")
-			password = ET.Element('password')
-			password.text = self.xmpp.password
-			query.append(password)
-		else:
-			log.debug("Authenticating via jabber:iq:auth Digest")
-			digest = ET.Element('digest')
-			digest.text = hashlib.sha1(b"%s%s" % (self.streamid, self.xmpp.password)).hexdigest()
-			query.append(digest)
-		attempt.append(query)
-		result = attempt.send()
-		if result.attrib['type'] == 'result':
-			with self.xmpp.lock:
-				self.xmpp.authenticated = True
-				self.xmpp.sessionstarted = True
-			self.xmpp.event("session_start")
-		else:
-			log.info("Authentication failed")
-			self.xmpp.disconnect()
-			self.xmpp.event("failed_auth")
diff --git a/sleekxmpp/plugins/xep_0078/__init__.py b/sleekxmpp/plugins/xep_0078/__init__.py
new file mode 100644
index 00000000..5a2bda77
--- /dev/null
+++ b/sleekxmpp/plugins/xep_0078/__init__.py
@@ -0,0 +1,12 @@
+"""
+    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.
+"""
+
+from sleekxmpp.plugins.xep_0078 import stanza
+from sleekxmpp.plugins.xep_0078.stanza import IqAuth, AuthFeature
+from sleekxmpp.plugins.xep_0078.legacyauth import xep_0078
+
diff --git a/sleekxmpp/plugins/xep_0078/legacyauth.py b/sleekxmpp/plugins/xep_0078/legacyauth.py
new file mode 100644
index 00000000..bdd2df67
--- /dev/null
+++ b/sleekxmpp/plugins/xep_0078/legacyauth.py
@@ -0,0 +1,108 @@
+"""
+    SleekXMPP: The Sleek XMPP Library
+    Copyright (C) 2011 Nathanael C. Fritz
+    This file is part of SleekXMPP.
+
+    See the file LICENSE for copying permission.
+"""
+
+import logging
+import hashlib
+import random
+
+from sleekxmpp.stanza import Iq, StreamFeatures
+from sleekxmpp.xmlstream import ElementBase, ET, register_stanza_plugin
+from sleekxmpp.plugins.base import base_plugin
+from sleekxmpp.plugins.xep_0078 import stanza
+
+
+log = logging.getLogger(__name__)
+
+
+class xep_0078(base_plugin):
+
+    """
+    XEP-0078 NON-SASL Authentication
+
+    This XEP is OBSOLETE in favor of using SASL, so DO NOT use this plugin
+    unless you are forced to use an old XMPP server implementation.
+    """
+
+    def plugin_init(self):
+        self.xep = "0078"
+        self.description = "Non-SASL Authentication"
+        self.stanza = stanza
+
+        self.xmpp.register_feature('auth',
+                self._handle_auth,
+                restart=False,
+                order=self.config.get('order', 15))
+
+        register_stanza_plugin(Iq, stanza.IqAuth)
+        register_stanza_plugin(StreamFeatures, stanza.AuthFeature)
+
+
+    def _handle_auth(self, features):
+        # If we can or have already authenticated with SASL, do nothing.
+        if 'mechanisms' in features['features']:
+            return False
+        if self.xmpp.authenticated:
+            return False
+
+        log.debug("Starting jabber:iq:auth Authentication")
+
+        # Step 1: Request the auth form
+        iq = self.xmpp.Iq()
+        iq['type'] = 'get'
+        iq['to'] = self.xmpp.boundjid.host
+        iq['auth']['username'] = self.xmpp.boundjid.user
+        resp = iq.send(now=True)
+
+        if resp is None or resp['type'] != 'result':
+            log.info("Authentication failed: %s" % resp['error']['condition'])
+            self.xmpp.event('failed_auth', resp, direct=True)
+            self.xmpp.disconnect()
+            return True
+
+        # Step 2: Fill out auth form for either password or digest auth
+        iq = self.xmpp.Iq()
+        iq['type'] = 'set'
+        iq['auth']['username'] = self.xmpp.boundjid.user
+
+        # A resource is required, so create a random one if necessary
+        if self.xmpp.boundjid.resource:
+            iq['auth']['resource'] = self.xmpp.boundjid.resource
+        else:
+            iq['auth']['resource'] = '%s' % random.random()
+
+        if 'digest' in resp['auth']['fields']:
+            log.debug('Authenticating via jabber:iq:auth Digest')
+            if sys.version_info < (3, 0):
+                stream_id = bytes(self.xmpp.stream_id)
+                password = bytes(self.xmpp.password)
+            else:
+                stream_id = bytes(self.xmpp.stream_id, encoding='utf-8')
+                password = bytes(self.xmpp.password, encoding='utf-8')
+
+            digest = hashlib.sha1(b'%s%s' % (stream_id, password)).hexdigest()
+            iq['auth']['digest'] = digest
+        else:
+            log.warning('Authenticating via jabber:iq:auth Plain.')
+            iq['auth']['password'] = self.xmpp.password
+
+        # Step 3: Send credentials
+        result = iq.send(now=True)
+        if result is not None and result.attrib['type'] == 'result':
+            self.xmpp.features.add('auth')
+
+            self.xmpp.authenticated = True
+            log.debug("Established Session")
+            self.xmpp.sessionstarted = True
+            self.xmpp.session_started_event.set()
+            self.xmpp.event('session_start')
+        else:
+            log.info("Authentication failed")
+            self.xmpp.disconnect()
+            self.xmpp.event("failed_auth")
+
+        return True
diff --git a/sleekxmpp/plugins/xep_0078/stanza.py b/sleekxmpp/plugins/xep_0078/stanza.py
new file mode 100644
index 00000000..86ba09ad
--- /dev/null
+++ b/sleekxmpp/plugins/xep_0078/stanza.py
@@ -0,0 +1,43 @@
+"""
+    SleekXMPP: The Sleek XMPP Library
+    Copyright (C) 2011 Nathanael C. Fritz
+    This file is part of SleekXMPP.
+
+    See the file LICENSE for copying permission.
+"""
+
+from sleekxmpp.xmlstream import ElementBase, ET, register_stanza_plugin
+
+
+class IqAuth(ElementBase):
+    namespace = 'jabber:iq:auth'
+    name = 'query'
+    plugin_attrib = 'auth'
+    interfaces = set(('fields', 'username', 'password', 'resource', 'digest'))
+    sub_interfaces = set(('username', 'password', 'resource', 'digest'))
+    plugin_tag_map = {}
+    plugin_attrib_map = {}
+
+    def get_fields(self):
+        fields = set()
+        for field in self.sub_interfaces:
+            if self.xml.find('{%s}%s' % (self.namespace, field)) is not None:
+                fields.add(field)
+        return fields
+
+    def set_resource(self, value):
+        self._set_sub_text('resource', value, keep=True)
+
+    def set_password(self, value):
+        self._set_sub_text('password', value, keep=True)
+
+
+class AuthFeature(ElementBase):
+    namespace = 'http://jabber.org/features/iq-auth'
+    name = 'auth'
+    plugin_attrib = 'auth'
+    interfaces = set()
+    plugin_tag_map = {}
+    plugin_attrib_map = {}
+
+