Security: Add configuration setting 'webservice_remote_ppt2png_enable' to disable additional_webservices.php by default

main/admin/configure_extensions.php

@@ -159,7 +159,11 @@ Display::display_header($nameTool);
                 <form method="POST" class="form-horizontal" action="<?php echo api_get_self(); ?>">
                     <?php
                     $form = new FormValidator('ppt2lp');
-                    $form->addElement('text', 'host', get_lang('Host'));
+                    if (api_get_configuration_value('webservice_remote_ppt2png_enable') == true) {
+                        $form->addElement('text', 'host', get_lang('Host'));
+                    } else {
+                        $form->addElement('text', 'host', [get_lang('Host'),'Remote host disabled - set webservice_remote_ppt2png_enable setting to true in configuration.php to enable']);
+                    }
                     //$form -> addElement('html','<br /><br />');
                     $form->addElement('text', 'port', get_lang('Port'));
                     //$form -> addElement('html','<br /><br />');

main/install/configuration.dist.php

@@ -2479,3 +2479,6 @@ INSERT INTO extra_field_options (field_id, option_value, display_text, priority,
 
 // Enable use of a custom course logo in mail & PDF headers
 // $_configuration['mail_header_from_custom_course_logo'] = false;
+
+// Enable additional_webservices.php for *remote* PPT2PNG/Oogie service
+//$_configuration['webservice_remote_ppt2png_enable'] = false;

main/webservices/additional_webservices.php

@@ -7,6 +7,12 @@
  */
 require_once __DIR__.'/../inc/global.inc.php';
 
+$enableThis = api_get_configuration_value('webservice_remote_ppt2png_enable');
+if (!$enableThis) {
+    echo "Remote PPT2PNG service is disabled. \n";
+    echo "To enable, add \$_configuration['webservice_remote_ppt2png_enable'] = true; to your configuration.php";
+    exit;
+}
 api_protect_webservices();
 
 /**