Add ldap.filter.is_filter() which checks filter syntax

spaceone · spaceone · commit 8fb491687304 · 2019-03-30T09:59:34.000+01:00
diff --git a/Lib/ldap/dn.py b/Lib/ldap/dn.py
@@ -111,7 +111,7 @@ def explode_rdn(rdn, notypes=False, flags=0):
 
 def is_dn(s,flags=0):
   """
-  Returns True is `s' can be parsed by ldap.dn.str2dn() like as a
+  Returns True if `s' can be parsed by ldap.dn.str2dn() like as a
   distinguished host_name (DN), otherwise False is returned.
   """
   try:
diff --git a/Lib/ldap/filter.py b/Lib/ldap/filter.py
@@ -87,3 +87,20 @@ def time_span_filter(
         until_timestr=strf_secs(until_timestamp),
     )
     # end of time_span_filter()
+
+
+def is_filter(filter_):
+    """
+    Returns True if `filter_' is a valid LDAP filter, otherwise False is returned.
+    """
+    import ldap
+    lo = ldap.initialize('')
+    try:
+        lo.search_ext_s('', ldap.SCOPE_BASE, filter_)
+    except (ldap.FILTER_ERROR, TypeError, ValueError):
+        return False
+    except ldap.SERVER_DOWN:
+        pass
+    finally:
+        lo.unbind()
+    return True
