zeroflag commented on a change in pull request #537:
URL: https://github.com/apache/knox/pull/537#discussion_r811837591



##########
File path: 
gateway-provider-identity-assertion-common/src/main/java/org/apache/knox/gateway/IdentityAsserterMessages.java
##########
@@ -17,12 +17,37 @@
  */
 package org.apache.knox.gateway;
 
+import java.util.Set;
+
 import org.apache.knox.gateway.i18n.messages.Message;
 import org.apache.knox.gateway.i18n.messages.MessageLevel;
 import org.apache.knox.gateway.i18n.messages.Messages;
+import org.apache.knox.gateway.plang.Ast;
+import org.apache.knox.gateway.plang.SyntaxException;
 
 @Messages(logger="org.apache.knox.gateway")
 public interface IdentityAsserterMessages {
   @Message( level = MessageLevel.ERROR, text = "Required subject/identity not 
available.  Check authentication/federation provider for proper configuration." 
)
   void subjectNotAvailable();
+
+  @Message( level = MessageLevel.WARN, text = "Virtual group name is missing 
after dot character.")
+  void missingVirtualGroupName();
+
+  @Message( level = MessageLevel.WARN, text = "Parse error: {2}. At {0}={1}")
+  void parseError(String key, String script, SyntaxException e);
+
+  @Message( level = MessageLevel.WARN, text = "Invalid result: {2}. Expected 
boolean when evaluating: {1}. For virtualGroup: {0}")

Review comment:
       I think this is a serious, but unlikely problem. So the predicate should 
always evaluate to a boolean value.
   
   For example:
   
   ```(= username 'admin')```
   
   But if the user specifies an expression that returns a string or a number, 
we won't know what to do and whether we should put the user into the virtual 
group or not. 




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