MDL-26069 detect missing file postprocessing

brokenfile.php

@@ -0,0 +1,31 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * This is an empty file which is used in order to prevent
+ * error logs in the serverlog.
+ *
+ * Sometimes developer forgets to postprocess files when saving
+ * submitted form data or forget to replace the file placeholders
+ * with the current area information.
+ *
+ * @package    core
+ * @subpackage file
+ * @copyright  2011 Petr Skoda (http://skodak.org)
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+@header('HTTP/1.0 404 not found');

lib/filelib.php

@@ -321,7 +321,7 @@ function file_get_unused_draft_itemid() {
  * @return string if $text was passed in, the rewritten $text is returned. Otherwise NULL.
  */
 function file_prepare_draft_area(&$draftitemid, $contextid, $component, $filearea, $itemid, array $options=null, $text=null) {
-    global $CFG, $USER;
+    global $CFG, $USER, $CFG;
 
     $options = (array)$options;
     if (!isset($options['subdirs'])) {
@@ -351,6 +351,12 @@ function file_prepare_draft_area(&$draftitemid, $contextid, $component, $fileare
                 $fs->create_file_from_storedfile($file_record, $file);
             }
         }
+        if (!is_null($text)) {
+            // at this point there should not be any draftfile links yet,
+            // because this is a new text from database that should still contain the @@pluginfile@@ links
+            // this happens when developers forget to post process the text
+            $text = str_replace("\"$CFG->httpswwwroot/draftfile.php", "\"$CFG->httpswwwroot/brokenfile.php#", $text);
+        }
     } else {
         // nothing to do
     }

lib/weblib.php

@@ -1106,6 +1106,13 @@ function format_text($text, $format = FORMAT_MOODLE, $options = NULL, $courseid_
             $text = $filtermanager->filter_text($text, $context, array('originalformat' => $format));
             break;
     }
+    if ($options['filter']) {
+        // at this point there should not be any draftfile links any more,
+        // this happens when developers forget to post process the text.
+        // The only potential problem is that somebody might try to format
+        // the text before storing into database which would be itself big bug.
+        $text = str_replace("\"$CFG->httpswwwroot/draftfile.php", "\"$CFG->httpswwwroot/brokenfile.php#", $text);
+    }
 
     // Warn people that we have removed this old mechanism, just in case they
     // were stupid enough to rely on it.