memories/lib/Db/TimelineQueryFaces.php

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<?php
declare(strict_types=1);
namespace OCA\Memories\Db;
use OCP\IDBConnection;
use OCP\DB\QueryBuilder\IQueryBuilder;
use OCP\Files\Folder;
trait TimelineQueryFaces {
protected IDBConnection $connection;
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public function transformFaceFilter(IQueryBuilder &$query, string $userId, string $faceName) {
// Get title and uid of face user
$faceNames = explode('/', $faceName);
if (count($faceNames) !== 2) return;
$faceUid = $faceNames[0];
$faceName = $faceNames[1];
// Get cluster ID
$sq = $query->getConnection()->getQueryBuilder();
$id = $sq->select('id')->from('recognize_face_clusters')
->where($query->expr()->eq('user_id', $sq->createNamedParameter($faceUid)))
->andWhere($query->expr()->eq('title', $sq->createNamedParameter($faceName)))
->executeQuery()->fetchOne();
if (!$id) return;
// Join with cluster
$query->innerJoin('m', 'recognize_face_detections', 'rfd', $query->expr()->andX(
$query->expr()->eq('rfd.file_id', 'm.fileid'),
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$query->expr()->eq('rfd.cluster_id', $query->createNamedParameter($id)),
));
}
public function getFaces(Folder $folder) {
$query = $this->connection->getQueryBuilder();
// SELECT all face clusters
$count = $query->func()->count($query->createFunction('DISTINCT m.fileid'), 'count');
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$query->select('rfc.id', 'rfc.user_id', 'rfc.title', $count)->from('recognize_face_clusters', 'rfc');
// WHERE there are faces with this cluster
$query->innerJoin('rfc', 'recognize_face_detections', 'rfd', $query->expr()->eq('rfc.id', 'rfd.cluster_id'));
// WHERE these items are memories indexed photos
$query->innerJoin('rfd', 'memories', 'm', $query->expr()->eq('m.fileid', 'rfd.file_id'));
// WHERE these photos are in the user's requested folder recursively
$query->innerJoin('m', 'filecache', 'f', $this->getFilecacheJoinQuery($query, $folder, true, false));
// GROUP by ID of face cluster
$query->groupBy('rfc.id');
// ORDER by number of faces in cluster
$query->orderBy('count', 'DESC');
// FETCH all faces
$faces = $query->executeQuery()->fetchAll();
// Post process
foreach($faces as &$row) {
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$row['id'] = intval($row['id']);
$row["name"] = $row["title"];
unset($row["title"]);
$row["count"] = intval($row["count"]);
}
return $faces;
}
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public function getFacePreviews(Folder $folder) {
$query = $this->connection->getQueryBuilder();
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// Windowing
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$rowNumber = $query->createFunction('ROW_NUMBER() OVER (PARTITION BY rfd.cluster_id) as n');
// SELECT face detections for ID
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$query->select(
'rfd.cluster_id',
'rfd.file_id',
'rfd.x', 'rfd.y', 'rfd.width', 'rfd.height',
'f.etag',
$rowNumber,
)->from('recognize_face_detections', 'rfd');
$query->where($query->expr()->isNotNull('rfd.cluster_id'));
// WHERE these photos are memories indexed
$query->innerJoin('rfd', 'memories', 'm', $query->expr()->eq('m.fileid', 'rfd.file_id'));
// WHERE these photos are in the user's requested folder recursively
$query->innerJoin('m', 'filecache', 'f', $this->getFilecacheJoinQuery($query, $folder, true, false));
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// Make this a sub query
$fun = $query->createFunction('(' . $query->getSQL() . ')');
// Create outer query
$outerQuery = $this->connection->getQueryBuilder();
$outerQuery->setParameters($query->getParameters());
$outerQuery->select('*')->from($fun, 't');
$outerQuery->where($query->expr()->lte('t.n', $outerQuery->createParameter('nc')));
$outerQuery->setParameter('nc', 4, IQueryBuilder::PARAM_INT);
// FETCH all face detections
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$previews = $outerQuery->executeQuery()->fetchAll();
// Post-process, everthing is a number
foreach($previews as &$row) {
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$row["cluster_id"] = intval($row["cluster_id"]);
$row["fileid"] = intval($row["file_id"]);
$row["x"] = floatval($row["x"]);
$row["y"] = floatval($row["y"]);
$row["width"] = floatval($row["width"]);
$row["height"] = floatval($row["height"]);
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// remove stale
unset($row["file_id"]);
unset($row["n"]);
}
return $previews;
}
}