GUACAMOLE-760: Add support for configuring server timezone.

extensions/guacamole-auth-jdbc/modules/guacamole-auth-jdbc-mysql/src/main/java/org/apache/guacamole/auth/mysql/MySQLAuthenticationProviderModule.java

@@ -24,6 +24,7 @@ import com.google.inject.Module;
 import com.google.inject.name.Names;
 import java.io.File;
 import java.util.Properties;
+import java.util.TimeZone;
 import org.apache.guacamole.GuacamoleException;
 import org.apache.guacamole.auth.mysql.conf.MySQLDriver;
 import org.apache.guacamole.auth.mysql.conf.MySQLEnvironment;
@@ -115,6 +116,11 @@ public class MySQLAuthenticationProviderModule implements Module {
         // Get the MySQL-compatible driver to use.
         mysqlDriver = environment.getMySQLDriver();
 
+        // If timezone is present, set it.
+        TimeZone serverTz = environment.getServerTimeZone();
+        if (serverTz != null)
+            driverProperties.setProperty("serverTimezone", serverTz.getID());
+
     }
 
     @Override

extensions/guacamole-auth-jdbc/modules/guacamole-auth-jdbc-mysql/src/main/java/org/apache/guacamole/auth/mysql/conf/MySQLEnvironment.java

@@ -23,6 +23,7 @@ import java.io.File;
 import java.sql.Connection;
 import java.sql.DatabaseMetaData;
 import java.sql.SQLException;
+import java.util.TimeZone;
 import org.apache.guacamole.GuacamoleException;
 import org.apache.guacamole.auth.jdbc.JDBCEnvironment;
 import org.slf4j.Logger;
@@ -393,4 +394,18 @@ public class MySQLEnvironment extends JDBCEnvironment {
                 false);
     }
 
+    /**
+     * Return the server timezone if configured in guacamole.properties, or
+     * null if the configuration option is not present.
+     * 
+     * @return
+     *     The server timezone as configured in guacamole.properties.
+     * 
+     * @throws GuacamoleException 
+     *     If an error occurs retrieving the configuration value.
+     */
+    public TimeZone getServerTimeZone() throws GuacamoleException {
+        return getProperty(MySQLGuacamoleProperties.SERVER_TIMEZONE);
+    }
+
 }

extensions/guacamole-auth-jdbc/modules/guacamole-auth-jdbc-mysql/src/main/java/org/apache/guacamole/auth/mysql/conf/MySQLGuacamoleProperties.java

@@ -24,6 +24,7 @@ import org.apache.guacamole.properties.EnumGuacamoleProperty;
 import org.apache.guacamole.properties.FileGuacamoleProperty;
 import org.apache.guacamole.properties.IntegerGuacamoleProperty;
 import org.apache.guacamole.properties.StringGuacamoleProperty;
+import org.apache.guacamole.properties.TimeZoneGuacamoleProperty;
 
 /**
  * Properties used by the MySQL Authentication plugin.
@@ -251,6 +252,16 @@ public class MySQLGuacamoleProperties {
     
         @Override
         public String getName() { return "mysql-auto-create-accounts"; }
+    };
+
+    /**
+     * The time zone of the MySQL database server.
+     */
+    public static final TimeZoneGuacamoleProperty SERVER_TIMEZONE =
+            new TimeZoneGuacamoleProperty() {
+                
+        @Override
+        public String getName() { return "mysql-server-timezone"; }
                 
     };
 

guacamole-ext/src/main/java/org/apache/guacamole/properties/TimeZoneGuacamoleProperty.java

@@ -0,0 +1,43 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.guacamole.properties;
+
+import java.util.TimeZone;
+import org.apache.guacamole.GuacamoleException;
+
+/**
+ * A GuacamoleProperty whose value is a TimeZone.
+ */
+public abstract class TimeZoneGuacamoleProperty
+        implements GuacamoleProperty<TimeZone> {
+    
+    @Override
+    public TimeZone parseValue(String value) throws GuacamoleException {
+        
+        // Nothing in, nothing out
+        if (value == null || value.isEmpty())
+            return null;
+        
+        // Attempt to return the TimeZone of the provided string value.
+        return TimeZone.getTimeZone(value);
+        
+    }
+    
+}