GUACAMOLE-363: Allow use of alternate JTDS driver.

extensions/guacamole-auth-jdbc/modules/guacamole-auth-jdbc-sqlserver/src/main/java/org/apache/guacamole/auth/sqlserver/SQLServerAuthenticationProviderModule.java

@@ -41,6 +41,11 @@ public class SQLServerAuthenticationProviderModule implements Module {
      */
     private final Properties driverProperties = new Properties();
 
+    /**
+     * Whether or not to use JTDS Driver
+     */
+    private Boolean useJTDSDriver = false;
+    
     /**
      * Creates a new SQLServer authentication provider module that configures
      * driver and MyBatis properties using the given environment.
@@ -70,12 +75,18 @@ public class SQLServerAuthenticationProviderModule implements Module {
         // Use UTF-8 in database
         driverProperties.setProperty("characterEncoding", "UTF-8");
 
+        // Capture whether or not to use the JTDS driver.
+        this.useJTDSDriver = environment.getSQLServerJTDSDriver();
+
     }
 
     @Override
     public void configure(Binder binder) {
 
         // Bind SQLServer-specific properties
+        if (this.useJTDSDriver)
+            JdbcHelper.SQL_Server_jTDS.configure(binder);
+        else
             JdbcHelper.SQL_Server_2005_MS_Driver.configure(binder);
         
         // Bind MyBatis properties

extensions/guacamole-auth-jdbc/modules/guacamole-auth-jdbc-sqlserver/src/main/java/org/apache/guacamole/auth/sqlserver/SQLServerEnvironment.java

@@ -303,4 +303,22 @@ public class SQLServerEnvironment extends JDBCEnvironment {
         return getRequiredProperty(SQLServerGuacamoleProperties.SQLSERVER_PASSWORD);
     }
 
+    /**
+     * Returns whether or not to use the SourceForge JTDS driver for more
+     * generic JTDS connections instead of the Microsoft-provided JDBC driver.
+     *
+     * @return
+     *     True if the JTDS driver should be used; false by default.
+     *
+     * @throws GuacamoleException
+     *     If an error occurs while retrieving the property value, or if the
+     *     value was not set, as this property is required.
+     */
+    public Boolean getSQLServerJTDSDriver() throws GuacamoleException {
+        return getProperty(
+            SQLServerGuacamoleProperties.SQLSERVER_JTDS_DRIVER,
+            false
+        );
+    }
+    
 }

extensions/guacamole-auth-jdbc/modules/guacamole-auth-jdbc-sqlserver/src/main/java/org/apache/guacamole/auth/sqlserver/SQLServerGuacamoleProperties.java

@@ -197,4 +197,15 @@ public class SQLServerGuacamoleProperties {
 
     };
 
+    /**
+     * Whether or not to use the JTDS driver for SQL Server connections.
+     */
+    public static final BooleanGuacamoleProperty
+            SQLSERVER_JTDS_DRIVER = new BooleanGuacamoleProperty() {
+
+        @Override
+        public String getName() { return "sqlserver-use-jtds-driver"; }
+
+    };
+
 }