From 4ff3b79b99a3919235295bf9ad055ec5a52c65ab Mon Sep 17 00:00:00 2001
From: steckbrief <steckbrief@chefmail.de>
Date: Sun, 21 Oct 2018 00:11:53 +0200
Subject: adds possibility to sort ascending or descending by timestamp

---
 storage-backend/index.php                          |  3 ++-
 storage-backend/lib/functions.filetransfer.inc.php | 17 ++++++++++++-----
 2 files changed, 14 insertions(+), 6 deletions(-)

diff --git a/storage-backend/index.php b/storage-backend/index.php
index 77a38f0..3dd9a8f 100644
--- a/storage-backend/index.php
+++ b/storage-backend/index.php
@@ -80,7 +80,8 @@ switch ($method) {
       case 'list':
         $limit = getOptionalPostParameter('limit', $config['list_default_limit']);
         $offset = getOptionalPostParameter('offset', 0);
-        $files = listFiles($userJid, $limit, $offset);
+        $descending = getOptionalPostParameter('descending', 'false') === 'true';
+        $files = listFiles($userJid, $limit, $offset, $descending);
         $result = ['list' => $files];
         break;
       case 'upload':
diff --git a/storage-backend/lib/functions.filetransfer.inc.php b/storage-backend/lib/functions.filetransfer.inc.php
index b89ac7a..e0cf35b 100644
--- a/storage-backend/lib/functions.filetransfer.inc.php
+++ b/storage-backend/lib/functions.filetransfer.inc.php
@@ -24,14 +24,21 @@ function loadSlotParameters($slotUUID, $config) {
   return $slotParameters;
 }
 
-function listFiles($jid, $limit = -1, $offset = 0) {
+function listFiles($jid, $limit = -1, $offset = 0, $descending = false) {
     // Read complete set of existing slots per jid (unsorted)
     $slots = readSlots($jid, $limit, $offset);
 
-    // Sort ascending by timestamp
-    usort($slots, function($a, $b) {
-        return $a['sent_time'] - $b['sent_time'];
-    });
+    if ($descending) {
+        // Sort descending by timestamp
+        usort($slots, function($a, $b) {
+            return $b['sent_time'] - $a['sent_time'];
+        });
+    } else {
+        // Sort ascending by timestamp
+        usort($slots, function($a, $b) {
+            return $a['sent_time'] - $b['sent_time'];
+        });
+    }
 
     // Select requested slot subset
     $offsetCounter = 0;
-- 
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