GUACAMOLE-524: Added reading of LDAP attributes in guacamole.properties named 'ldap-user-attributes'.

Added method getAttributes() in ConfigurationService to read environment property
LDAPGuacamoleProperties.LDAP_USER_ATTRIBUTES. These
attributes are arbitrary LDAP attributes that will
be mapped to the user in credentials and
tokens.

extensions/guacamole-auth-ldap/src/main/java/org/apache/guacamole/auth/ldap/ConfigurationService.java

@@ -227,7 +227,7 @@ public class ConfigurationService {
     private int getMaxResults() throws GuacamoleException {
         return environment.getProperty(
             LDAPGuacamoleProperties.LDAP_MAX_SEARCH_RESULTS,
-            1000 
+            1000
         );
     }
 
@@ -344,4 +344,20 @@ public class ConfigurationService {
         );
     }
 
+    /**
+     * Returns names for custom LDAP user attributes.
+     *
+     * @return
+     *     LDAP user attributes as defined in the guacamole.properties file
+     *     as ldap-user-attributes: ''
+     *
+     * @throws GuacamoleException
+     *     If guacamole.properties cannot be parsed.
+     */
+    public List<String> getAttributes() throws GuacamoleException {
+        return environment.getProperty(
+            LDAPGuacamoleProperties.LDAP_USER_ATTRIBUTES
+        );
+    }
+
 }

extensions/guacamole-auth-ldap/src/main/java/org/apache/guacamole/auth/ldap/LDAPGuacamoleProperties.java

@@ -205,4 +205,14 @@ public class LDAPGuacamoleProperties {
 
     };
 
+    /**
+     * Custom attribute or attributes in Guacamole user's record in the
+     * LDAP directory.
+     */
+    public static final StringListProperty LDAP_USER_ATTRIBUTES = new StringListProperty() {
+
+        @Override
+        public String getName() { return "ldap-user-attributes"; }
+
+    };
 }