From 8009b0485e1205833af03f914721a7789f88e31c Mon Sep 17 00:00:00 2001
From: Lance Stout <lancestout@gmail.com>
Date: Mon, 30 Jul 2012 19:30:01 -0700
Subject: Add stream feature for server support of subscription pre-approvals.

---
 sleekxmpp/clientxmpp.py                            |  3 +-
 sleekxmpp/features/__init__.py                     |  3 +-
 sleekxmpp/features/feature_preapproval/__init__.py | 15 ++++++++
 .../features/feature_preapproval/preapproval.py    | 42 ++++++++++++++++++++++
 sleekxmpp/features/feature_preapproval/stanza.py   | 17 +++++++++
 5 files changed, 78 insertions(+), 2 deletions(-)
 create mode 100644 sleekxmpp/features/feature_preapproval/__init__.py
 create mode 100644 sleekxmpp/features/feature_preapproval/preapproval.py
 create mode 100644 sleekxmpp/features/feature_preapproval/stanza.py

diff --git a/sleekxmpp/clientxmpp.py b/sleekxmpp/clientxmpp.py
index e3b434e9..7cdaa799 100644
--- a/sleekxmpp/clientxmpp.py
+++ b/sleekxmpp/clientxmpp.py
@@ -113,9 +113,10 @@ class ClientXMPP(BaseXMPP):
         self.register_plugin('feature_starttls')
         self.register_plugin('feature_bind')
         self.register_plugin('feature_session')
+        self.register_plugin('feature_rosterver')
+        self.register_plugin('feature_preapproval')
         self.register_plugin('feature_mechanisms',
                 pconfig={'use_mech': sasl_mech} if sasl_mech else None)
-        self.register_plugin('feature_rosterver')
 
     @property
     def password(self):
diff --git a/sleekxmpp/features/__init__.py b/sleekxmpp/features/__init__.py
index 1ef1e0cf..869de7e9 100644
--- a/sleekxmpp/features/__init__.py
+++ b/sleekxmpp/features/__init__.py
@@ -11,5 +11,6 @@ __all__ = [
     'feature_mechanisms',
     'feature_bind',
     'feature_session',
-    'feature_rosterver'
+    'feature_rosterver',
+    'feature_preapproval'
 ]
diff --git a/sleekxmpp/features/feature_preapproval/__init__.py b/sleekxmpp/features/feature_preapproval/__init__.py
new file mode 100644
index 00000000..ae8b6b70
--- /dev/null
+++ b/sleekxmpp/features/feature_preapproval/__init__.py
@@ -0,0 +1,15 @@
+"""
+    SleekXMPP: The Sleek XMPP Library
+    Copyright (C) 2012  Nathanael C. Fritz
+    This file is part of SleekXMPP.
+
+    See the file LICENSE for copying permission.
+"""
+
+from sleekxmpp.plugins.base import register_plugin
+
+from sleekxmpp.features.feature_preapproval.preapproval import FeaturePreApproval
+from sleekxmpp.features.feature_preapproval.stanza import PreApproval
+
+
+register_plugin(FeaturePreApproval)
diff --git a/sleekxmpp/features/feature_preapproval/preapproval.py b/sleekxmpp/features/feature_preapproval/preapproval.py
new file mode 100644
index 00000000..3823c472
--- /dev/null
+++ b/sleekxmpp/features/feature_preapproval/preapproval.py
@@ -0,0 +1,42 @@
+"""
+    SleekXMPP: The Sleek XMPP Library
+    Copyright (C) 2012  Nathanael C. Fritz
+    This file is part of SleekXMPP.
+
+    See the file LICENSE for copying permission.
+"""
+
+import logging
+
+from sleekxmpp.stanza import Iq, StreamFeatures
+from sleekxmpp.features.feature_preapproval import stanza
+from sleekxmpp.xmlstream import register_stanza_plugin
+from sleekxmpp.plugins.base import BasePlugin
+
+
+log = logging.getLogger(__name__)
+
+
+class FeaturePreApproval(BasePlugin):
+
+    name = 'feature_preapproval'
+    description = 'RFC 6121: Stream Feature: Subscription Pre-Approval'
+    dependences = set()
+    stanza = stanza
+
+    def plugin_init(self):
+        self.xmpp.register_feature('preapproval',
+                self._handle_preapproval,
+                restart=False,
+                order=9001)
+
+        register_stanza_plugin(StreamFeatures, stanza.PreApproval)
+
+    def _handle_preapproval(self, features):
+        """Save notice that the server support subscription pre-approvals.
+
+        Arguments:
+            features -- The stream features stanza.
+        """
+        log.debug("Server supports subscription pre-approvals.")
+        self.xmpp.features.add('preapproval')
diff --git a/sleekxmpp/features/feature_preapproval/stanza.py b/sleekxmpp/features/feature_preapproval/stanza.py
new file mode 100644
index 00000000..4a59bd16
--- /dev/null
+++ b/sleekxmpp/features/feature_preapproval/stanza.py
@@ -0,0 +1,17 @@
+"""
+    SleekXMPP: The Sleek XMPP Library
+    Copyright (C) 2012  Nathanael C. Fritz
+    This file is part of SleekXMPP.
+
+    See the file LICENSE for copying permission.
+"""
+
+from sleekxmpp.xmlstream import ElementBase
+
+
+class PreApproval(ElementBase):
+
+    name = 'sub'
+    namespace = 'urn:xmpp:features:pre-approval'
+    interfaces = set()
+    plugin_attrib = 'preapproval'
-- 
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