Use new metadata API

Signed-off-by: Louis Chemineau <louis@chmn.me>

lib/AppInfo/Application.php

@@ -31,12 +31,15 @@
 use OCA\Photos\Listener\PlaceManagerEventListener;
 use OCA\Photos\Listener\SabrePluginAuthInitListener;
 use OCA\Photos\Listener\TagListener;
+use OCA\Photos\MetadataProvider\ExifMetadataProvider;
+use OCA\Photos\MetadataProvider\OriginalDateTimeMetadataProvider;
+use OCA\Photos\MetadataProvider\SizeMetadataProvider;
 use OCP\AppFramework\App;
 use OCP\AppFramework\Bootstrap\IBootContext;
 use OCP\AppFramework\Bootstrap\IBootstrap;
 use OCP\AppFramework\Bootstrap\IRegistrationContext;
 use OCP\Files\Events\Node\NodeDeletedEvent;
-use OCP\Files\Events\Node\NodeWrittenEvent;
+use OCP\FilesMetadata\Event\MetadataLiveEvent;
 use OCP\Group\Events\GroupDeletedEvent;
 use OCP\Group\Events\UserRemovedEvent;
 use OCP\Share\Events\ShareDeletedEvent;
@@ -75,8 +78,11 @@ public function register(IRegistrationContext $context): void {
 		/** Register $principalBackend for the DAV collection */
 		$context->registerServiceAlias('principalBackend', Principal::class);
 
-		// Priority of -1 to be triggered after event listeners populating metadata.
-		$context->registerEventListener(NodeWrittenEvent::class, PlaceManagerEventListener::class, -1);
+		// Metadata
+		$context->registerEventListener(MetadataLiveEvent::class, ExifMetadataProvider::class, 1);
+		$context->registerEventListener(MetadataLiveEvent::class, SizeMetadataProvider::class);
+		$context->registerEventListener(MetadataLiveEvent::class, OriginalDateTimeMetadataProvider::class);
+		$context->registerEventListener(MetadataLiveEvent::class, PlaceManagerEventListener::class, -1);
 
 		$context->registerEventListener(NodeDeletedEvent::class, AlbumsManagementEventListener::class);
 		$context->registerEventListener(UserRemovedEvent::class, AlbumsManagementEventListener::class);

lib/MetadataProvider/ExifMetadataProvider.php

@@ -0,0 +1,136 @@
+<?php
+
+declare(strict_types=1);
+/**
+ * @copyright Copyright 2022 Carl Schwan <carl@carlschwan.eu>
+ * @copyright Copyright 2022 Louis Chmn <louis@chmn.me>
+ * @license AGPL-3.0-or-later
+ *
+ * This code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License, version 3,
+ * along with this program. If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+
+namespace OCA\Photos\MetadataProvider;
+
+use OCA\Photos\AppInfo\Application;
+use OCP\EventDispatcher\Event;
+use OCP\EventDispatcher\IEventListener;
+use OCP\Files\File;
+use OCP\FilesMetadata\Event\MetadataLiveEvent;
+use Psr\Log\LoggerInterface;
+
+/**
+ * Extract EXIF, IFD0, and GPS data from a picture file.
+ * EXIF data reference: https://web.archive.org/web/20220428165430/exif.org/Exif2-2.PDF
+ *
+ * @template-implements IEventListener<OCP\FilesMetadata\Event\MetadataLiveEvent>
+ */
+class ExifMetadataProvider implements IEventListener {
+	public function __construct(
+		private LoggerInterface $logger
+	) {
+	}
+
+	public function handle(Event $event): void {
+		if (!($event instanceof MetadataLiveEvent)) {
+			return;
+		}
+
+		$node = $event->getNode();
+
+		if (!$node instanceof File) {
+			return;
+		}
+
+		$path = $node->getPath();
+		if (str_starts_with($path, 'appdata_') || str_starts_with($path, 'files_versions/') || str_starts_with($path, 'files_trashbin/')) {
+			return;
+		}
+
+		if (!in_array($node->getMimeType(), Application::IMAGE_MIMES)) {
+			return;
+		}
+
+		if (!extension_loaded('exif')) {
+			return;
+		}
+
+		$fileDescriptor = $node->fopen('rb');
+		if ($fileDescriptor === false) {
+			return;
+		}
+
+		$rawExifData = null;
+
+		try {
+			// HACK: The stream_set_chunk_size call is needed to make reading exif data reliable.
+			// This is to trigger this condition: https://github.com/php/php-src/blob/d64aa6f646a7b5e58359dc79479860164239580a/main/streams/streams.c#L710
+			// But I don't understand yet why 1 as a special meaning.
+			$oldBufferSize = stream_set_chunk_size($fileDescriptor, 1);
+			$rawExifData = @exif_read_data($fileDescriptor, 'EXIF, GPS', true);
+			// We then revert the change after having read the exif data.
+			stream_set_chunk_size($fileDescriptor, $oldBufferSize);
+		} catch (\Exception $ex) {
+			$this->logger->info("Failed to extract metadata for " . $node->getId(), ['exception' => $ex]);
+		}
+
+		if ($rawExifData && array_key_exists('EXIF', $rawExifData)) {
+			$event->getMetadata()->setArray('photos-exif', $rawExifData['EXIF']);
+		}
+
+		if ($rawExifData && array_key_exists('IFD0', $rawExifData)) {
+			$event->getMetadata()->setArray('photos-ifd0', $rawExifData['IFD0']);
+		}
+
+		if (
+			$rawExifData &&
+			array_key_exists('GPS', $rawExifData) &&
+			array_key_exists('GPSLatitude', $rawExifData['GPS']) && array_key_exists('GPSLatitudeRef', $rawExifData['GPS']) &&
+			array_key_exists('GPSLongitude', $rawExifData['GPS']) && array_key_exists('GPSLongitudeRef', $rawExifData['GPS'])
+		) {
+			$event->getMetadata()->setArray('photos-gps', [
+				'latitude' => $this->gpsDegreesToDecimal($rawExifData['GPS']['GPSLatitude'], $rawExifData['GPS']['GPSLatitudeRef']),
+				'longitude' => $this->gpsDegreesToDecimal($rawExifData['GPS']['GPSLongitude'], $rawExifData['GPS']['GPSLongitudeRef']),
+				'altitude' => ($rawExifData['GPS']['GPSAltitudeRef'] === "\u{0000}" ? 1 : -1) * $this->parseGPSData($rawExifData['GPS']['GPSAltitude']),
+			]);
+		}
+	}
+
+	/**
+	 * @param array|string $coordinates
+	 */
+	private function gpsDegreesToDecimal($coordinates, ?string $hemisphere): float {
+		if (is_string($coordinates)) {
+			$coordinates = array_map("trim", explode(",", $coordinates));
+		}
+
+		if (count($coordinates) !== 3) {
+			throw new \Exception('Invalid coordinate format: ' . json_encode($coordinates));
+		}
+
+		[$degrees, $minutes, $seconds] = array_map(fn ($rawDegree) => $this->parseGPSData($rawDegree), $coordinates);
+
+		$sign = ($hemisphere === 'W' || $hemisphere === 'S') ? -1 : 1;
+		return $sign * ($degrees + $minutes / 60 + $seconds / 3600);
+	}
+
+	private function parseGPSData(string $rawData): float {
+		$parts = explode('/', $rawData);
+
+		if ($parts[1] === '0') {
+			return 0;
+		}
+
+		return floatval($parts[0]) / floatval($parts[1] ?? 1);
+	}
+}

lib/MetadataProvider/OriginalDateTimeMetadataProvider.php

@@ -0,0 +1,94 @@
+<?php
+
+declare(strict_types=1);
+/**
+ * @copyright Copyright 2022 Carl Schwan <carl@carlschwan.eu>
+ * @copyright Copyright 2022 Louis Chmn <louis@chmn.me>
+ * @license AGPL-3.0-or-later
+ *
+ * This code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License, version 3,
+ * along with this program. If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+
+namespace OCA\Photos\MetadataProvider;
+
+use DateTime;
+use OCA\Photos\AppInfo\Application;
+use OCP\EventDispatcher\Event;
+use OCP\EventDispatcher\IEventListener;
+use OCP\Files\File;
+use OCP\FilesMetadata\Event\MetadataLiveEvent;
+
+/**
+ * @template-implements IEventListener<OCP\FilesMetadata\Event\MetadataLiveEvent>
+ */
+class OriginalDateTimeMetadataProvider implements IEventListener {
+	public function __construct() {
+	}
+
+	public function handle(Event $event): void {
+		if (!($event instanceof MetadataLiveEvent)) {
+			return;
+		}
+
+		$node = $event->getNode();
+
+		if (!$node instanceof File) {
+			return;
+		}
+
+		$path = $node->getPath();
+		if (str_starts_with($path, 'appdata_') || str_starts_with($path, 'files_versions/') || str_starts_with($path, 'files_trashbin/')) {
+			return;
+		}
+
+		if (!in_array($node->getMimeType(), Application::IMAGE_MIMES)) {
+			return;
+		}
+
+		$metadata = $event->getMetadata();
+
+		if ($metadata->hasKey('photos-exif') && array_key_exists('DateTimeOriginal', $metadata->getArray('photos-exif'))) {
+			$rawDateTimeOriginal = $metadata->getArray('photos-exif')['DateTimeOriginal'];
+			$dateTimeOriginal = DateTime::createFromFormat("Y:m:d G:i:s", $rawDateTimeOriginal);
+			$metadata->setInt('photos-original_date_time', $dateTimeOriginal->getTimestamp(), true);
+			return;
+		}
+
+		$name = $node->getName();
+		$matches = [];
+
+		$matchesCount = preg_match('/^IMG_([0-9]{8}_[0-9]{6})/', $name, $matches);
+		if ($matchesCount > 0) {
+			$dateTimeOriginal = DateTime::createFromFormat("Ymd_Gis", $matches[1]);
+			$metadata->setInt('photos-original_date_time', $dateTimeOriginal->getTimestamp(), true);
+			return;
+		}
+
+		$matchesCount = preg_match('/^PANO_([0-9]{8}_[0-9]{6})/', $name, $matches);
+		if ($matchesCount > 0) {
+			$dateTimeOriginal = DateTime::createFromFormat("Ymd_Gis", $matches[1]);
+			$metadata->setInt('photos-original_date_time', $dateTimeOriginal->getTimestamp(), true);
+			return;
+		}
+
+		$matchesCount = preg_match('/^([0-9]{4}-[0-9]{2}-[0-9]{2}-[0-9]{2}-[0-9]{2}-[0-9]{2}-[0-9]{4})/', $name, $matches);
+		if ($matchesCount > 0) {
+			$dateTimeOriginal = DateTime::createFromFormat("Y-m-d-G-i-s", $matches[1]);
+			$metadata->setInt('photos-original_date_time', $dateTimeOriginal->getTimestamp(), true);
+			return;
+		}
+
+		$metadata->setInt('photos-original_date_time', $node->getMTime(), true);
+	}
+}

lib/MetadataProvider/PlaceMetadataProvider.php

@@ -0,0 +1,62 @@
+<?php
+
+declare(strict_types=1);
+/**
+ * @copyright Copyright 2023 Louis Chmn <louis@chmn.me>
+ * @license AGPL-3.0-or-later
+ *
+ * This code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License, version 3,
+ * along with this program. If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+
+namespace OC\FilesMetadata\Provider;
+
+use DateTime;
+use OCP\EventDispatcher\Event;
+use OCP\EventDispatcher\IEventListener;
+use OCP\Files\File;
+use OCP\FilesMetadata\Event\MetadataLiveEvent;
+
+class OriginalDateTimeMetadataProvider implements IEventListener {
+	public function __construct() {
+	}
+
+	public function handle(Event $event): void {
+		if ($event instanceof MetadataLiveEvent) {
+			$node = $event->getNode();
+
+			if (!$node instanceof File) {
+				return;
+			}
+
+			if (!preg_match('/image\/(png|jpeg|heif|webp|tiff)/', $node->getMimetype())) {
+				return;
+			}
+
+			$event->requestBackgroundJob();
+			return;
+		}
+
+		if (!($event instanceof MetadataBackgroundEvent)) {
+			return;
+		}
+
+		return;
+
+		$metadata = $event->getMetadata();
+
+		$this->mediaPlaceManager->setPlaceForFile($fileId);
+
+		$metadata->set('photos-place', '', true)
+	}
+}

lib/MetadataProvider/SizeMetadataProvider.php

@@ -0,0 +1,72 @@
+<?php
+
+declare(strict_types=1);
+/**
+ * @copyright Copyright 2022 Carl Schwan <carl@carlschwan.eu>
+ * @copyright Copyright 2022 Louis Chmn <louis@chmn.me>
+ * @license AGPL-3.0-or-later
+ *
+ * This code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License, version 3,
+ * along with this program. If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+
+namespace OCA\Photos\MetadataProvider;
+
+use OCA\Photos\AppInfo\Application;
+use OCP\EventDispatcher\Event;
+use OCP\EventDispatcher\IEventListener;
+use OCP\Files\File;
+use OCP\FilesMetadata\Event\MetadataLiveEvent;
+use Psr\Log\LoggerInterface;
+
+/**
+ * @template-implements IEventListener<OCP\FilesMetadata\Event\MetadataLiveEvent>
+ */
+class SizeMetadataProvider implements IEventListener {
+	public function __construct(
+		private LoggerInterface $logger
+	) {
+	}
+
+	public function handle(Event $event): void {
+		if (!($event instanceof MetadataLiveEvent)) {
+			return;
+		}
+
+		$node = $event->getNode();
+
+		if (!$node instanceof File) {
+			return;
+		}
+
+		$path = $node->getPath();
+		if (str_starts_with($path, 'appdata_') || str_starts_with($path, 'files_versions/') || str_starts_with($path, 'files_trashbin/')) {
+			return;
+		}
+
+		if (!in_array($node->getMimeType(), Application::IMAGE_MIMES)) {
+			return;
+		}
+
+		$size = getimagesizefromstring($node->getContent());
+
+		if ($size === false) {
+			return;
+		}
+
+		$event->getMetadata()->setArray('photos-size', [
+			'width' => $size[0],
+			'height' => $size[1],
+		]);
+	}
+}