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From a89bd2361a3971d0dc11908707509bbf5e1fd1ac Mon Sep 17 00:00:00 2001
From: Ilya Etingof <etingof@gmail.com>
Date: Wed, 11 Oct 2017 20:27:41 +0200
Subject: [PATCH] accommodate changed pyasn1 behaviour

pyasn1 versions prior to 0.2.3 indicate absent value by
returning `None` object, later pyasn1 versions use
the `noValue` sentinel object which is the basis for
the `.hasValue()` method call (and .isValue property).

This fix makes the code compatible with both `None` sentinel
and the `.hasValue()` test thus making it compatible with all
reasonable pyasn1 versions in circulation.
---
Index: Lib/ldap/syncrepl.py
===================================================================
RCS file: /cvsroot/python-ldap/python-ldap/Lib/ldap/syncrepl.py,v
retrieving revision 1.9
diff -u -r1.9 syncrepl.py
--- Lib/ldap/syncrepl.py	9 Oct 2017 15:09:28 -0000	1.9
+++ Lib/ldap/syncrepl.py	7 Nov 2017 13:40:32 -0000
@@ -131,11 +131,13 @@
         d = decoder.decode(encodedControlValue, asn1Spec = syncStateValue())
         state = d[0].getComponentByName('state')
         uuid = UUID(bytes=d[0].getComponentByName('entryUUID'))
-        self.cookie = d[0].getComponentByName('cookie')
+        cookie = d[0].getComponentByName('cookie')
+        if cookie is None or not cookie.hasValue():
+            self.cookie = None
+        else:
+            self.cookie = str(cookie)
         self.state = self.__class__.opnames[int(state)]
         self.entryUUID = str(uuid)
-        if self.cookie is not None:
-            self.cookie = str(self.cookie)
 
 KNOWN_RESPONSE_CONTROLS[SyncStateControl.controlType] = SyncStateControl
 
@@ -165,10 +167,10 @@
 
     def decodeControlValue(self, encodedControlValue):
         d = decoder.decode(encodedControlValue, asn1Spec = syncDoneValue())
-        self.cookie = d[0].getComponentByName('cookie')
+        cookie = d[0].getComponentByName('cookie')
+        if cookie is not None and cookie.hasValue():
+            self.cookie = str(cookie)
         self.refreshDeletes = d[0].getComponentByName('refreshDeletes')
-        if self.cookie is not None:
-            self.cookie = str(self.cookie)
         if self.refreshDeletes is not None:
             self.refreshDeletes = bool(self.refreshDeletes)
 
@@ -263,7 +265,7 @@
         for attr in [ 'newcookie', 'refreshDelete', 'refreshPresent', 'syncIdSet']:
             comp = d[0].getComponentByName(attr)
 
-            if comp is not None:
+            if comp is not None and comp.hasValue():
 
                 if attr == 'newcookie':
                     self.newcookie = str(comp)
@@ -272,7 +274,7 @@
                 val = dict()
 
                 cookie = comp.getComponentByName('cookie')
-                if cookie is not None:
+                if cookie is not None and cookie.hasValue():
                     val['cookie'] = str(cookie)
 
                 if attr.startswith('refresh'):
Index: Lib/ldap/controls/ppolicy.py
===================================================================
RCS file: /cvsroot/python-ldap/python-ldap/Lib/ldap/controls/ppolicy.py,v
retrieving revision 1.6
diff -u -r1.6 ppolicy.py
--- Lib/ldap/controls/ppolicy.py	9 Oct 2017 15:09:28 -0000	1.6
+++ Lib/ldap/controls/ppolicy.py	7 Nov 2017 13:40:32 -0000
@@ -71,7 +71,7 @@
   def decodeControlValue(self,encodedControlValue):
     ppolicyValue,_ = decoder.decode(encodedControlValue,asn1Spec=PasswordPolicyResponseValue())
     warning = ppolicyValue.getComponentByName('warning')
-    if warning is None:
+    if warning is None or not warning.hasValue():
       self.timeBeforeExpiration,self.graceAuthNsRemaining = None,None
     else:
       timeBeforeExpiration = warning.getComponentByName('timeBeforeExpiration')
@@ -85,7 +85,7 @@
       else:
         self.graceAuthNsRemaining = None
     error = ppolicyValue.getComponentByName('error')
-    if error is None:
+    if error is None or not error.hasValue():
       self.error = None
     else:
       self.error = int(error)
Index: Lib/ldap/controls/psearch.py
===================================================================
RCS file: /cvsroot/python-ldap/python-ldap/Lib/ldap/controls/psearch.py,v
retrieving revision 1.6
diff -u -r1.6 psearch.py
--- Lib/ldap/controls/psearch.py	9 Oct 2017 15:09:28 -0000	1.6
+++ Lib/ldap/controls/psearch.py	7 Nov 2017 13:40:32 -0000
@@ -115,18 +115,16 @@
   def decodeControlValue(self,encodedControlValue):
     ecncValue,_ = decoder.decode(encodedControlValue,asn1Spec=EntryChangeNotificationValue())
     self.changeType = int(ecncValue.getComponentByName('changeType'))
-    if len(ecncValue)==3:
-      self.previousDN = str(ecncValue.getComponentByName('previousDN'))
-      self.changeNumber = int(ecncValue.getComponentByName('changeNumber'))
-    elif len(ecncValue)==2:
-      if self.changeType==8:
-        self.previousDN = str(ecncValue.getComponentByName('previousDN'))
-        self.changeNumber = None
-      else:
-        self.previousDN = None
-        self.changeNumber = int(ecncValue.getComponentByName('changeNumber'))
+    previousDN = ecncValue.getComponentByName('previousDN')
+    if previousDN is None or not previousDN.hasValue():
+      self.previousDN = None
     else:
-      self.previousDN,self.changeNumber = None,None
+      self.previousDN = str(previousDN)
+    changeNumber = ecncValue.getComponentByName('changeNumber')
+    if changeNumber is None or not changeNumber.hasValue():
+      self.changeNumber = None
+    else:
+      self.changeNumber = int(changeNumber)
     return (self.changeType,self.previousDN,self.changeNumber)
 
 KNOWN_RESPONSE_CONTROLS[EntryChangeNotificationControl.controlType] = EntryChangeNotificationControl
Index: Lib/ldap/controls/sss.py
===================================================================
RCS file: /cvsroot/python-ldap/python-ldap/Lib/ldap/controls/sss.py,v
retrieving revision 1.5
diff -u -r1.5 sss.py
--- Lib/ldap/controls/sss.py	9 Oct 2017 15:09:28 -0000	1.5
+++ Lib/ldap/controls/sss.py	7 Nov 2017 13:40:32 -0000
@@ -121,7 +121,9 @@
         assert not rest, 'all data could not be decoded'
         self.result = int(p.getComponentByName('sortResult'))
         self.result_code = p.getComponentByName('sortResult').prettyOut(self.result)
-        self.attribute_type_error = p.getComponentByName('attributeType')
+        attribute_type_error = p.getComponentByName('attributeType')
+        if attribute_type_error is not None and attribute_type_error.hasValue():
+            self.attribute_type_error = attribute_type_error
 
 
 KNOWN_RESPONSE_CONTROLS[SSSRequestControl.controlType] = SSSRequestControl
Index: Lib/ldap/controls/vlv.py
===================================================================
RCS file: /cvsroot/python-ldap/python-ldap/Lib/ldap/controls/vlv.py,v
retrieving revision 1.5
diff -u -r1.5 vlv.py
--- Lib/ldap/controls/vlv.py	9 Oct 2017 15:09:28 -0000	1.5
+++ Lib/ldap/controls/vlv.py	7 Nov 2017 13:40:32 -0000
@@ -130,8 +130,9 @@
         self.result = int(p.getComponentByName('virtualListViewResult'))
         self.result_code = p.getComponentByName('virtualListViewResult') \
                 .prettyOut(self.result)
-        self.context_id = p.getComponentByName('contextID')
-        if self.context_id:
-            self.context_id = str(self.context_id)
+        context_id = p.getComponentByName('contextID')
+        if context_id is not None and context_id.hasValue():
+            self.context_id = str(context_id)
+
 
 KNOWN_RESPONSE_CONTROLS[VLVResponseControl.controlType] = VLVResponseControl