Exif Reader IMplementation

app/code/Magento/MediaGalleryMetadata/Model/Jpeg/Segment/ReadExif.php

@@ -0,0 +1,74 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\MediaGalleryMetadata\Model\Jpeg\Segment;
+
+use Magento\MediaGalleryMetadataApi\Api\Data\MetadataInterface;
+use Magento\MediaGalleryMetadataApi\Api\Data\MetadataInterfaceFactory;
+use Magento\MediaGalleryMetadataApi\Model\FileInterface;
+use Magento\MediaGalleryMetadataApi\Model\ReadMetadataInterface;
+use Magento\MediaGalleryMetadataApi\Model\SegmentInterface;
+
+/**
+ * Jpeg EXIF Reader
+ */
+class ReadExif implements ReadMetadataInterface
+{
+    private const EXIF_SEGMENT_NAME = 'APP1';
+    private const EXIF_SEGMENT_START = "Exif\x00";
+    private const EXIF_DATA_START_POSITION = 0;
+
+    /**
+     * @var MetadataInterfaceFactory
+     */
+    private $metadataFactory;
+
+    /**
+     * @param MetadataInterfaceFactory $metadataFactory
+     */
+    public function __construct(
+        MetadataInterfaceFactory $metadataFactory
+    ) {
+        $this->metadataFactory = $metadataFactory;
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function execute(FileInterface $file): MetadataInterface
+    {
+        $title = null;
+        $description = null;
+        $keywords = [];
+
+        foreach ($file->getSegments() as $segment) {
+            if ($this->isExifSegment($segment)) {
+            }
+        }
+        return $this->metadataFactory->create([
+            'title' => $title,
+            'description' => $description,
+            'keywords' => !empty($keywords) ? $keywords : null
+        ]);
+    }
+
+    /**
+     * Does segment contain Exif data
+     *
+     * @param SegmentInterface $segment
+     * @return bool
+     */
+    private function isExifSegment(SegmentInterface $segment): bool
+    {
+        return $segment->getName() === self::EXIF_SEGMENT_NAME
+            && strncmp(
+                substr($segment->getData(), self::EXIF_DATA_START_POSITION, 4),
+                self::EXIF_SEGMENT_START,
+                self::EXIF_DATA_START_POSITION
+            ) == 0;
+    }
+}

app/code/Magento/MediaGalleryMetadata/etc/di.xml

@@ -121,6 +121,7 @@
             <argument name="segmentReaders" xsi:type="array">
                 <item name="xmp" xsi:type="object">Magento\MediaGalleryMetadata\Model\Jpeg\Segment\ReadXmp</item>
                 <item name="iptc" xsi:type="object">Magento\MediaGalleryMetadata\Model\Jpeg\Segment\ReadIptc</item>
+                <item name="exif" xsi:type="object">Magento\MediaGalleryMetadata\Model\Jpeg\Segment\ReadExif</item>
             </argument>
         </arguments>
     </virtualType>