Add exif tags to systemtags table

lib/Db/ExifFields.php

@@ -73,6 +73,7 @@ class ExifFields
         'CircleOfConfusion' => true,
         'DOF' => true,
         'FOV' => true,
+        'TagsList' => true,
 
         // Currently unused fields
         'ExifVersion' => true,

lib/Db/TimelineWrite.php

@@ -22,6 +22,7 @@ class TimelineWrite
     use TimelineWriteMap;
     use TimelineWriteOrphans;
     use TimelineWritePlaces;
+    use TimelineWriteTags;
 
     public function __construct(
         protected IDBConnection $connection,
@@ -104,6 +105,10 @@ public function processFile(
             return Util::transaction(fn () => $this->livePhoto->processVideoPart($file, $exif));
         }
 
+        if (!empty($exif['TagsList'])){
+            Util::transaction(fn () => $this->processTags($file, $exif));
+        }
+
         // If control reaches here, it's not a Live Photo video part
         // But if prevRow exists and dayid is not set, it *was* a live video part
         // In this case delete that entry (very rare edge case)

lib/Db/TimelineWriteTags.php

@@ -0,0 +1,49 @@
+<?php
+
+declare(strict_types=1);
+
+namespace OCA\Memories\Db;
+
+use OCP\DB\QueryBuilder\IQueryBuilder;
+use OCP\Files\File;
+use Psr\Log\LoggerInterface;
+use OCP\IDBConnection;
+
+trait TimelineWriteTags
+{
+    protected IDBConnection $connection;
+    protected LoggerInterface $logger;
+
+    public function processTags(File $file, array $exif): void
+    {
+        foreach ($exif["TagsList"] as $tag) {
+            $query = $this->connection->getQueryBuilder();
+            $exists = $query->select('id')
+                ->from('systemtag')
+                ->where($query->expr()->eq('name', $query->createNamedParameter($tag,  IQueryBuilder::PARAM_STR)))
+                ->executeQuery()
+                ->fetch();
+
+            if (!$exists) {
+                $query = $this->connection->getQueryBuilder();
+                $query->insert('systemtag')
+                    ->values([
+                        'name' => $query->createNamedParameter($tag, IQueryBuilder::PARAM_STR)
+                    ])->executeStatement();
+                $exists = $query->getLastInsertId();
+            }
+
+            $query = $this->connection->getQueryBuilder();
+            $params = [
+                'systemtagid' => $query->createNamedParameter($exists, IQueryBuilder::PARAM_INT),
+                'objectid' => $query->createNamedParameter($file->getId(), IQueryBuilder::PARAM_STR),
+                'objecttype' => $query->createNamedParameter('files', IQueryBuilder::PARAM_STR),
+            ];
+            $query->insert('systemtag_object_mapping')
+                ->values($params)->executeStatement();
+
+            $this->logger->info("Added $tag to file {$file->getId()}");
+        }
+    }
+}
+