From 437f5dc4cf0e3c4a4614aeaf298aac4ab0f8284a Mon Sep 17 00:00:00 2001
From: Marina Glancy <marina@moodle.com>
Date: Thu, 9 Aug 2012 13:50:42 +0800
Subject: [PATCH] MDL-34290 Auto synchronise newly created references when
 possible

---
 lib/filestorage/file_storage.php | 29 +++++++++++++++++++++++------
 repository/repository_ajax.php   |  9 +++++++--
 2 files changed, 30 insertions(+), 8 deletions(-)

diff --git a/lib/filestorage/file_storage.php b/lib/filestorage/file_storage.php
index 71c8fc8389a13..b18105b18debb 100644
--- a/lib/filestorage/file_storage.php
+++ b/lib/filestorage/file_storage.php
@@ -1266,22 +1266,39 @@ public function create_file_from_reference($filerecord, $repositoryid, $referenc
         $transaction = $DB->start_delegated_transaction();
 
         try {
-            $filerecord->referencefileid = $this->get_or_create_referencefileid($repositoryid, $reference,
-                $filerecord->referencelastsync, $filerecord->referencelifetime);
+            $filerecord->referencefileid = $this->get_or_create_referencefileid($repositoryid, $reference);
         } catch (Exception $e) {
             throw new file_reference_exception($repositoryid, $reference, null, null, $e->getMessage());
         }
 
-        // External file doesn't have content in moodle.
-        // So we create an empty file for it.
-        list($filerecord->contenthash, $filerecord->filesize, $newfile) = $this->add_string_to_pool(null);
+        if (isset($filerecord->contenthash) && $this->content_exists($filerecord->contenthash)) {
+            // there was specified the contenthash for a file already stored in moodle filepool
+            if (empty($filerecord->filesize)) {
+                $filepathname = $this->path_from_hash($filerecord->contenthash) . '/' . $filerecord->contenthash;
+                $filerecord->filesize = filesize($filepathname);
+            } else {
+                $filerecord->filesize = clean_param($filerecord->filesize, PARAM_INT);
+            }
+        } else {
+            // atempt to get the result of last synchronisation for this reference
+            $lastcontent = $DB->get_record('files', array('referencefileid' => $filerecord->referencefileid),
+                    'id, contenthash, filesize', IGNORE_MULTIPLE);
+            if ($lastcontent) {
+                $filerecord->contenthash = $lastcontent->contenthash;
+                $filerecord->filesize = $lastcontent->filesize;
+            } else {
+                // External file doesn't have content in moodle.
+                // So we create an empty file for it.
+                list($filerecord->contenthash, $filerecord->filesize, $newfile) = $this->add_string_to_pool(null);
+            }
+        }
 
         $filerecord->pathnamehash = $this->get_pathname_hash($filerecord->contextid, $filerecord->component, $filerecord->filearea, $filerecord->itemid, $filerecord->filepath, $filerecord->filename);
 
         try {
             $filerecord->id = $DB->insert_record('files', $filerecord);
         } catch (dml_exception $e) {
-            if ($newfile) {
+            if (!empty($newfile)) {
                 $this->deleted_file_cleanup($filerecord->contenthash);
             }
             throw new stored_file_creation_exception($filerecord->contextid, $filerecord->component, $filerecord->filearea, $filerecord->itemid,
diff --git a/repository/repository_ajax.php b/repository/repository_ajax.php
index 8c9fc7faf6d6e..17d679c00348d 100644
--- a/repository/repository_ajax.php
+++ b/repository/repository_ajax.php
@@ -234,6 +234,8 @@
                 if ($file && $file->is_external_file()) {
                     $sourcefield = $file->get_source(); // remember the original source
                     $record->source = $repo::build_source_field($sourcefield);
+                    $record->contenthash = $file->get_contenthash();
+                    $record->filesize = $file->get_filesize();
                     $reference = $file->get_reference();
                     $repo_id = $file->get_repository_id();
                     $repo = repository::get_repository_by_id($repo_id, $contextid, $repooptions);
@@ -241,8 +243,11 @@
             }
 
             if ($usefilereference) {
-                // get reference life time from repo
-                $record->referencelifetime = $repo->get_reference_file_lifetime($reference);
+                if ($repo->has_moodle_files()) {
+                    $sourcefile = repository::get_moodle_file($reference);
+                    $record->contenthash = $sourcefile->get_contenthash();
+                    $record->filesize = $sourcefile->get_filesize();
+                }
                 // Check if file exists.
                 if (repository::draftfile_exists($itemid, $saveas_path, $saveas_filename)) {
                     // File name being used, rename it.