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|
<?php
namespace OC\Metadata\Provider;
use OC\Metadata\FileMetadata;
use OC\Metadata\IMetadataProvider;
use OCP\Files\File;
use Psr\Log\LoggerInterface;
class ExifProvider implements IMetadataProvider {
private LoggerInterface $logger;
public function __construct(
LoggerInterface $logger
) {
$this->logger = $logger;
}
public static function groupsProvided(): array {
return ['size', 'gps'];
}
public static function isAvailable(): bool {
return extension_loaded('exif');
}
public function execute(File $file): array {
$exifData = [];
$fileDescriptor = $file->fopen('rb');
$data = null;
try {
// 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 why 1 as a special meaning.
// Revert right after reading the exif data.
$oldBufferSize = stream_set_chunk_size($fileDescriptor, 1);
$data = exif_read_data($fileDescriptor, 'ANY_TAG', true);
stream_set_chunk_size($fileDescriptor, $oldBufferSize);
} catch (\Exception $ex) {
$this->logger->warning("Couldn't extract metadata for ".$file->getId(), ['exception' => $ex]);
}
$size = new FileMetadata();
$size->setGroupName('size');
$size->setId($file->getId());
$size->setMetadata([]);
if (!$data) {
$sizeResult = getimagesizefromstring($file->getContent());
if ($sizeResult !== false) {
$size->setMetadata([
'width' => $sizeResult[0],
'height' => $sizeResult[1],
]);
$exifData['size'] = $size;
}
} elseif (array_key_exists('COMPUTED', $data)) {
if (array_key_exists('Width', $data['COMPUTED']) && array_key_exists('Height', $data['COMPUTED'])) {
$size->setMetadata([
'width' => $data['COMPUTED']['Width'],
'height' => $data['COMPUTED']['Height'],
]);
$exifData['size'] = $size;
}
}
if ($data && array_key_exists('GPS', $data)
&& array_key_exists('GPSLatitude', $data['GPS']) && array_key_exists('GPSLatitudeRef', $data['GPS'])
&& array_key_exists('GPSLongitude', $data['GPS']) && array_key_exists('GPSLongitudeRef', $data['GPS'])
) {
$gps = new FileMetadata();
$gps->setGroupName('gps');
$gps->setId($file->getId());
$gps->setMetadata([
'latitude' => $this->gpsDegreesToDecimal($data['GPS']['GPSLatitude'], $data['GPS']['GPSLatitudeRef']),
'longitude' => $this->gpsDegreesToDecimal($data['GPS']['GPSLongitude'], $data['GPS']['GPSLongitudeRef']),
]);
$exifData['gps'] = $gps;
}
return $exifData;
}
public static function getMimetypesSupported(): string {
return '/image\/.*/';
}
/**
* @param array|string $coordinates
*/
private static function gpsDegreesToDecimal($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(function (string $rawDegree) {
$parts = explode('/', $rawDegree);
if ($parts[1] === '0') {
return 0;
}
return floatval($parts[0]) / floatval($parts[1] ?? 1);
}, $coordinates);
$sign = ($hemisphere === 'W' || $hemisphere === 'S') ? -1 : 1;
return $sign * ($degrees + $minutes / 60 + $seconds / 3600);
}
}
|
