public PostgreSQLSSLMode getPostgreSQLSSLMode() throws GuacamoleException {
        return getProperty(PostgreSQLGuacamoleProperties.POSTGRESQL_SSL_MODE,
                DEFAULT_SSL_MODE);
    }
Get the SSL mode to use to make the JDBC connection to the PostgreSQL
server.  If unspecified this will default to PREFER, attempting SSL
and falling back to plain-text if SSL fails.

@return
    The enum value of the SSL mode to use to make the JDBC connection
    to the server.

@throws GuacamoleException
    If an error occurs retrieving the value from guacamole.properties.
extensions/guacamole-auth-jdbc/modules/guacamole-auth-jdbc-postgresql/src/main/java/org/apache/guacamole/auth/postgresql/conf/PostgreSQLEnvironment.java