2 files changed, 178 insertions, 0 deletions
diff --git a/apps/files_versions/lib/Db/VersionEntity.php b/apps/files_versions/lib/Db/VersionEntity.php
new file mode 100644
index 00000000000..10f1dc8cbba
--- /dev/null
+++ b/apps/files_versions/lib/Db/VersionEntity.php
@@ -0,0 +1,74 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2022 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OCA\Files_Versions\Db;
+
+use JsonSerializable;
+
+use OCP\AppFramework\Db\Entity;
+use OCP\DB\Types;
+
+/**
+ * @method int getFileId()
+ * @method void setFileId(int $fileId)
+ * @method int getTimestamp()
+ * @method void setTimestamp(int $timestamp)
+ * @method int|float getSize()
+ * @method void setSize(int|float $size)
+ * @method int getMimetype()
+ * @method void setMimetype(int $mimetype)
+ * @method array|null getMetadata()
+ * @method void setMetadata(array $metadata)
+ */
+class VersionEntity extends Entity implements JsonSerializable {
+	protected ?int $fileId = null;
+	protected ?int $timestamp = null;
+	protected ?int $size = null;
+	protected ?int $mimetype = null;
+	protected ?array $metadata = null;
+
+	public function __construct() {
+		$this->addType('id', Types::INTEGER);
+		$this->addType('file_id', Types::INTEGER);
+		$this->addType('timestamp', Types::INTEGER);
+		$this->addType('size', Types::INTEGER);
+		$this->addType('mimetype', Types::INTEGER);
+		$this->addType('metadata', Types::JSON);
+	}
+
+	public function jsonSerialize(): array {
+		return [
+			'id' => $this->id,
+			'file_id' => $this->fileId,
+			'timestamp' => $this->timestamp,
+			'size' => $this->size,
+			'mimetype' => $this->mimetype,
+			'metadata' => $this->metadata,
+		];
+	}
+
+	/**
+	 * @abstract given a key, return the value associated with the key in the metadata column
+	 * if nothing is found, we return an empty string
+	 * @param string $key key associated with the value
+	 */
+	public function getMetadataValue(string $key): ?string {
+		return $this->metadata[$key] ?? null;
+	}
+
+	/**
+	 * @abstract sets a key value pair in the metadata column
+	 * @param string $key key associated with the value
+	 * @param string $value value associated with the key
+	 */
+	public function setMetadataValue(string $key, string $value): void {
+		$this->metadata[$key] = $value;
+		$this->markFieldUpdated('metadata');
+	}
+}
diff --git a/apps/files_versions/lib/Db/VersionsMapper.php b/apps/files_versions/lib/Db/VersionsMapper.php
new file mode 100644
index 00000000000..318dd8f0d82
--- /dev/null
+++ b/apps/files_versions/lib/Db/VersionsMapper.php
@@ -0,0 +1,104 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2022 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OCA\Files_Versions\Db;
+
+use OCP\AppFramework\Db\QBMapper;
+use OCP\DB\QueryBuilder\IQueryBuilder;
+use OCP\IDBConnection;
+
+/**
+ * @extends QBMapper<VersionEntity>
+ */
+class VersionsMapper extends QBMapper {
+	public function __construct(IDBConnection $db) {
+		parent::__construct($db, 'files_versions', VersionEntity::class);
+	}
+
+	/**
+	 * @return VersionEntity[]
+	 */
+	public function findAllVersionsForFileId(int $fileId): array {
+		$qb = $this->db->getQueryBuilder();
+
+		$qb->select('*')
+			->from($this->getTableName())
+			->where($qb->expr()->eq('file_id', $qb->createNamedParameter($fileId)));
+
+		return $this->findEntities($qb);
+	}
+
+	/**
+	 * @return VersionEntity
+	 */
+	public function findCurrentVersionForFileId(int $fileId): VersionEntity {
+		$qb = $this->db->getQueryBuilder();
+
+		$qb->select('*')
+			->from($this->getTableName())
+			->where($qb->expr()->eq('file_id', $qb->createNamedParameter($fileId)))
+			->orderBy('timestamp', 'DESC')
+			->setMaxResults(1);
+
+		return $this->findEntity($qb);
+	}
+
+	public function findVersionForFileId(int $fileId, int $timestamp): VersionEntity {
+		$qb = $this->db->getQueryBuilder();
+
+		$qb->select('*')
+			->from($this->getTableName())
+			->where($qb->expr()->eq('file_id', $qb->createNamedParameter($fileId)))
+			->andWhere($qb->expr()->eq('timestamp', $qb->createNamedParameter($timestamp)));
+
+		return $this->findEntity($qb);
+	}
+
+	public function deleteAllVersionsForFileId(int $fileId): int {
+		$qb = $this->db->getQueryBuilder();
+
+		return $qb->delete($this->getTableName())
+			->where($qb->expr()->eq('file_id', $qb->createNamedParameter($fileId)))
+			->executeStatement();
+	}
+
+	public function deleteAllVersionsForUser(int $storageId, ?string $path = null): void {
+		$fileIdsGenerator = $this->getFileIdsGenerator($storageId, $path);
+
+		$versionEntitiesDeleteQuery = $this->db->getQueryBuilder();
+		$versionEntitiesDeleteQuery->delete($this->getTableName())
+			->where($versionEntitiesDeleteQuery->expr()->in('file_id', $versionEntitiesDeleteQuery->createParameter('file_ids')));
+
+		foreach ($fileIdsGenerator as $fileIds) {
+			$versionEntitiesDeleteQuery->setParameter('file_ids', $fileIds, IQueryBuilder::PARAM_INT_ARRAY);
+			$versionEntitiesDeleteQuery->executeStatement();
+		}
+	}
+
+	private function getFileIdsGenerator(int $storageId, ?string $path): \Generator {
+		$offset = 0;
+		do {
+			$filesIdsSelect = $this->db->getQueryBuilder();
+			$filesIdsSelect->select('fileid')
+				->from('filecache')
+				->where($filesIdsSelect->expr()->eq('storage', $filesIdsSelect->createNamedParameter($storageId, IQueryBuilder::PARAM_STR)))
+				->andWhere($filesIdsSelect->expr()->like('path', $filesIdsSelect->createNamedParameter('files' . ($path ? '/' . $this->db->escapeLikeParameter($path) : '') . '/%', IQueryBuilder::PARAM_STR)))
+				->andWhere($filesIdsSelect->expr()->gt('fileid', $filesIdsSelect->createParameter('offset')))
+				->setMaxResults(1000)
+				->orderBy('fileid', 'ASC');
+
+			$filesIdsSelect->setParameter('offset', $offset, IQueryBuilder::PARAM_INT);
+			$result = $filesIdsSelect->executeQuery();
+			$fileIds = $result->fetchAll(\PDO::FETCH_COLUMN);
+			$offset = end($fileIds);
+
+			yield $fileIds;
+		} while (!empty($fileIds));
+	}
+}