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Move metadata extraction out to its own service (#45)
Also moved the GPS coordinate/altitude methods out of the Helper class as they're not called anywhere else.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,242 @@ | ||
| <?php | ||
|
|
||
| namespace App\Metadata; | ||
|
|
||
| class Extractor | ||
| { | ||
| /** | ||
| * Extracts metadata from an image file | ||
| * | ||
| * @param string $filename | ||
| * @return array | ||
| */ | ||
| public function extract(string $filename) : array | ||
| { | ||
| $imageInfo = []; | ||
| $info = getimagesize($filename, $imageInfo); | ||
|
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| $metadata = [ | ||
| 'type' => $info['mime'], | ||
| 'width' => $info[0], | ||
| 'height' => $info[1], | ||
| 'title' => '', | ||
| 'description' => '', | ||
| 'orientation' => '', | ||
| 'iso' => '', | ||
| 'aperture' => '', | ||
| 'make' => '', | ||
| 'model' => '', | ||
| 'shutter' => '', | ||
| 'focal' => '', | ||
| 'takestamp' => null, | ||
| 'lens' => '', | ||
| 'tags' => '', | ||
| 'position' => '', | ||
| 'latitude' => null, | ||
| 'longitude' => null, | ||
| 'altitude' => null | ||
| ]; | ||
|
|
||
| // Size | ||
| $size = filesize($filename) / 1024; | ||
| if ($size >= 1024) { | ||
| $metadata['size'] = round($size / 1024, 1).' MB'; | ||
| } | ||
| else { | ||
| $metadata['size'] = round($size, 1).' KB'; | ||
| } | ||
|
|
||
| // IPTC Metadata | ||
| // See https://www.iptc.org/std/IIM/4.2/specification/IIMV4.2.pdf for mapping | ||
| if (isset($imageInfo['APP13'])) { | ||
| $imageInfo = iptcparse($imageInfo['APP13']); | ||
| if (is_array($imageInfo)) { | ||
| // Title | ||
| if (!empty($imageInfo['2#105'][0])) { | ||
| $metadata['title'] = $imageInfo['2#105'][0]; | ||
| } | ||
| else { | ||
| if (!empty($imageInfo['2#005'][0])) { | ||
| $metadata['title'] = $imageInfo['2#005'][0]; | ||
| } | ||
| } | ||
|
|
||
| // Description | ||
| if (!empty($imageInfo['2#120'][0])) { | ||
| $metadata['description'] = $imageInfo['2#120'][0]; | ||
| } | ||
|
|
||
| // Tags | ||
| if (!empty($imageInfo['2#025'])) { | ||
| $metadata['tags'] = implode(',', $imageInfo['2#025']); | ||
| } | ||
|
|
||
| // Position | ||
| $fields = array(); | ||
| if (!empty($imageInfo['2#090'])) { | ||
| $fields[] = trim($imageInfo['2#090'][0]); | ||
| } | ||
| if (!empty($imageInfo['2#092'])) { | ||
| $fields[] = trim($imageInfo['2#092'][0]); | ||
| } | ||
| if (!empty($imageInfo['2#095'])) { | ||
| $fields[] = trim($imageInfo['2#095'][0]); | ||
| } | ||
| if (!empty($imageInfo['2#101'])) { | ||
| $fields[] = trim($imageInfo['2#101'][0]); | ||
| } | ||
|
|
||
| if (!empty($fields)) { | ||
| $metadata['position'] = implode(', ', $fields); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| // Read EXIF | ||
| if ($info['mime'] == 'image/jpeg') { | ||
| $exif = @exif_read_data($filename, 'EXIF', false, false); | ||
| } | ||
| else { | ||
| $exif = false; | ||
| } | ||
|
|
||
| // EXIF Metadata | ||
| if ($exif !== false) { | ||
| // Orientation | ||
| if (isset($exif['Orientation'])) { | ||
| $metadata['orientation'] = $exif['Orientation']; | ||
| } | ||
| else { | ||
| if (isset($exif['IFD0']['Orientation'])) { | ||
| $metadata['orientation'] = $exif['IFD0']['Orientation']; | ||
| } | ||
| } | ||
|
|
||
| // ISO | ||
| if (!empty($exif['ISOSpeedRatings'])) { | ||
| $metadata['iso'] = $exif['ISOSpeedRatings']; | ||
| } | ||
|
|
||
| // Aperture | ||
| if (!empty($exif['COMPUTED']['ApertureFNumber'])) { | ||
| $metadata['aperture'] = $exif['COMPUTED']['ApertureFNumber']; | ||
| } | ||
|
|
||
| // Make | ||
| if (!empty($exif['Make'])) { | ||
| $metadata['make'] = trim($exif['Make']); | ||
| } | ||
|
|
||
| // Model | ||
| if (!empty($exif['Model'])) { | ||
| $metadata['model'] = trim($exif['Model']); | ||
| } | ||
|
|
||
| // Exposure | ||
| if (!empty($exif['ExposureTime'])) { | ||
| $metadata['shutter'] = $exif['ExposureTime'].' s'; | ||
| } | ||
|
|
||
| // Focal Length | ||
| if (!empty($exif['FocalLength'])) { | ||
| if (strpos($exif['FocalLength'], '/') !== false) { | ||
| $temp = explode('/', $exif['FocalLength'], 2); | ||
| $temp = $temp[0] / $temp[1]; | ||
| $temp = round($temp, 1); | ||
| $metadata['focal'] = $temp.' mm'; | ||
| } | ||
| else { | ||
| $metadata['focal'] = $exif['FocalLength'].' mm'; | ||
| } | ||
| } | ||
|
|
||
| // Takestamp | ||
| if (!empty($exif['DateTimeOriginal'])) { | ||
| if ($exif['DateTimeOriginal'] == '0000:00:00 00:00:00') { | ||
| $metadata['takestamp'] = null; | ||
| } | ||
| else { | ||
| if (strtotime($exif['DateTimeOriginal']) == 0) { | ||
| $metadata['takestamp'] = null; | ||
| } | ||
| else { | ||
| $metadata['takestamp'] = date("Y-m-d H:i:s", strtotime($exif['DateTimeOriginal'])); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| if (!empty($exif['LensInfo'])) { | ||
| $metadata['lens'] = trim($exif['LensInfo']); | ||
| } | ||
| // Lens field from Lightroom | ||
| if ($metadata['lens'] == '' && !empty($exif['UndefinedTag:0xA434'])) { | ||
| $metadata['lens'] = trim($exif['UndefinedTag:0xA434']); | ||
| } | ||
|
|
||
| // Deal with GPS coordinates | ||
| if (!empty($exif['GPSLatitude']) && !empty($exif['GPSLatitudeRef'])) { | ||
| $metadata['latitude'] = $this->getGPSCoordinate($exif['GPSLatitude'], $exif['GPSLatitudeRef']); | ||
| } | ||
| if (!empty($exif['GPSLongitude']) && !empty($exif['GPSLongitudeRef'])) { | ||
| $metadata['longitude'] = $this->getGPSCoordinate($exif['GPSLongitude'], $exif['GPSLongitudeRef']); | ||
| } | ||
| if (!empty($exif['GPSAltitude']) && !empty($exif['GPSAltitudeRef'])) { | ||
| $metadata['altitude'] = $this->getGPSAltitude($exif['GPSAltitude'], $exif['GPSAltitudeRef']); | ||
| } | ||
| } | ||
|
|
||
| return $metadata; | ||
| } | ||
|
|
||
|
|
||
| /** | ||
| * Returns the normalized coordinate from EXIF array | ||
| * | ||
| * @param array $coordinate | ||
| * @param string $ref | ||
| * @return float Normalized coordinate as float number (degrees) | ||
| */ | ||
| private function getGPSCoordinate(array $coordinate, string $ref) : float | ||
| { | ||
| $degrees = count($coordinate) > 0 ? $this->formattedToFloatGPS($coordinate[0]) : 0; | ||
| $minutes = count($coordinate) > 1 ? $this->formattedToFloatGPS($coordinate[1]) : 0; | ||
| $seconds = count($coordinate) > 2 ? $this->formattedToFloatGPS($coordinate[2]) : 0; | ||
|
|
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| $flip = ($ref == 'W' || $ref == 'S') ? -1 : 1; | ||
|
|
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| return $flip * ($degrees + (float) $minutes / 60 + (float) $seconds / 3600); | ||
| } | ||
|
|
||
| /** | ||
| * Converts a `rational64u` to a float (`29451/625 => 47.1216`) | ||
| * | ||
| * @param string $rational | ||
| * @return float | ||
| */ | ||
| private function formattedToFloatGPS(string $rational) : float | ||
| { | ||
| $parts = explode('/', $rational, 2); | ||
|
|
||
| if (count($parts) <= 0) { | ||
| return 0.0; | ||
| } | ||
| if (count($parts) == 1) { | ||
| return (float) $parts[0]; | ||
| } | ||
|
|
||
| return (float) $parts[0] / $parts[1]; | ||
| } | ||
|
|
||
| /** | ||
| * Returns the altitude either above or below sea level | ||
| * | ||
| * @param string $altitude | ||
| * @param string $ref | ||
| * @return float | ||
| */ | ||
| private function getGPSAltitude(string $altitude, string $ref) : float | ||
| { | ||
| $flip = ($ref == '1') ? -1 : 1; | ||
| return $flip * $this->formattedToFloatGPS($altitude); | ||
| } | ||
| } |
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