MDL-32862 - Backup: Rewriting resource_old links on backup.

moodle · Sep 6, 2013 · a3b2df6 · a3b2df6
1 parent ee78814
commit a3b2df6
Showing 1 changed file with 61 additions and 4 deletions.
diff --git a/mod/resource/backup/moodle2/backup_resource_activity_task.class.php b/mod/resource/backup/moodle2/backup_resource_activity_task.class.php
@@ -33,6 +33,11 @@
  */
 class backup_resource_activity_task extends backup_activity_task {
 
+    /**
+     * @param bool $resourceoldexists True if there are records in the resource_old table.
+     */
+    protected static $resourceoldexists = null;
+
     /**
      * No specific settings for this activity
      */
@@ -57,14 +62,66 @@ static public function encode_content_links($content) {
 
         $base = preg_quote($CFG->wwwroot,"/");
 
-        // Link to the list of resources
+        // Link to the list of resources.
         $search="/(".$base."\/mod\/resource\/index.php\?id\=)([0-9]+)/";
         $content= preg_replace($search, '$@RESOURCEINDEX*$2@$', $content);
 
-        // Link to resource view by moduleid
-        $search="/(".$base."\/mod\/resource\/view.php\?id\=)([0-9]+)/";
-        $content= preg_replace($search, '$@RESOURCEVIEWBYID*$2@$', $content);
+        // Link to resource view by moduleid.
+        $search = "/(".$base."\/mod\/resource\/view.php\?id\=)([0-9]+)/";
+        // Link to resource view by recordid
+        $search2 = "/(".$base."\/mod\/resource\/view.php\?r\=)([0-9]+)/";
+
+        // Check whether there are contents in the resource old table.
+        if (static::$resourceoldexists === null) {
+            static::$resourceoldexists = $DB->record_exists('resource_old', array());
+        }
+
+        // If there are links to items in the resource_old table, rewrite them to be links to the correct URL
+        // for their new module.
+        if (static::$resourceoldexists) {
+            // Match all of the resources.
+            $result = preg_match_all($search, $content, $matches, PREG_PATTERN_ORDER);
+
+            // Course module ID resource links.
+            if ($result) {
+                list($insql, $params) = $DB->get_in_or_equal($matches[2]);
+                $oldrecs = $DB->get_records_select('resource_old', "cmid $insql", $params, '', 'cmid, newmodule');
+
+                for ($i = 0; $i < count($matches[0]); $i++) {
+                    $cmid = $matches[2][$i];
+                    if (isset($oldrecs[$cmid])) {
+                        // Resource_old item, rewrite it
+                        $replace = '$@' . strtoupper($oldrecs[$cmid]->newmodule) . 'VIEWBYID*' . $cmid . '@$';
+                    } else {
+                        // Not in the resource old table, don't rewrite
+                        $replace = '$@RESOURCEVIEWBYID*'.$cmid.'@$';
+                    }
+                    $content = str_replace($matches[0][$i], $replace, $content);
+                }
+            }
+
+            $matches = null;
+            $result = preg_match_all($search2, $content, $matches, PREG_PATTERN_ORDER);
+
+            // No resource links.
+            if (!$result) {
+                return $content;
+            }
+            // Resource ID links.
+            list($insql, $params) = $DB->get_in_or_equal($matches[2]);
+            $oldrecs = $DB->get_records_select('resource_old', "oldid $insql", $params, '', 'oldid, cmid, newmodule');
 
+            for ($i = 0; $i < count($matches[0]); $i++) {
+                $recordid = $matches[2][$i];
+                if (isset($oldrecs[$recordid])) {
+                    // Resource_old item, rewrite it
+                    $replace = '$@' . strtoupper($oldrecs[$recordid]->newmodule) . 'VIEWBYID*' . $oldrecs[$recordid]->cmid . '@$';
+                    $content = str_replace($matches[0][$i], $replace, $content);
+                }
+            }
+        } else {
+            $content = preg_replace($search, '$@RESOURCEVIEWBYID*$2@$', $content);
+        }
         return $content;
     }
 }