Switch to exifr for image metadata extraction (#6922)

* Switch to exifr for image metadata extraction

* Fix migrations on pg

* Prevent double divider

Co-authored-by: rijkvanzanten <rijkvanzanten@me.com>

api/src/database/migrations/20210805B-change-image-metadata-structure.ts

@@ -0,0 +1,94 @@
+import { Knex } from 'knex';
+
+// Change image metadata structure to match the output from 'exifr'
+export async function up(knex: Knex): Promise<void> {
+	const files = await knex
+		.select<{ id: number; metadata: string }[]>('id', 'metadata')
+		.from('directus_files')
+		.whereNotNull('metadata');
+
+	for (const { id, metadata } of files) {
+		let prevMetadata;
+
+		try {
+			prevMetadata = JSON.parse(metadata);
+		} catch {
+			continue;
+		}
+
+		// Update only required if metadata has 'exif' data
+		if (prevMetadata.exif) {
+			// Get all data from 'exif' and rename the following keys:
+			// - 'image' to 'ifd0'
+			// - 'thumbnail to 'ifd1'
+			// - 'interoperability' to 'interop'
+			const newMetadata = prevMetadata.exif;
+
+			if (newMetadata.image) {
+				newMetadata.ifd0 = newMetadata.image;
+				delete newMetadata.image;
+			}
+			if (newMetadata.thumbnail) {
+				newMetadata.ifd1 = newMetadata.thumbnail;
+				delete newMetadata.thumbnail;
+			}
+			if (newMetadata.interoperability) {
+				newMetadata.interop = newMetadata.interoperability;
+				delete newMetadata.interoperability;
+			}
+			if (prevMetadata.icc) {
+				newMetadata.icc = prevMetadata.icc;
+			}
+			if (prevMetadata.iptc) {
+				newMetadata.iptc = prevMetadata.iptc;
+			}
+
+			await knex('directus_files')
+				.update({ metadata: JSON.stringify(newMetadata) })
+				.where({ id });
+		}
+	}
+}
+
+export async function down(knex: Knex): Promise<void> {
+	const files = await knex
+		.select<{ id: number; metadata: string }[]>('id', 'metadata')
+		.from('directus_files')
+		.whereNotNull('metadata')
+		.whereNot('metadata', '{}');
+
+	for (const { id, metadata } of files) {
+		const prevMetadata = JSON.parse(metadata);
+
+		// Update only required if metadata has keys other than 'icc' and 'iptc'
+		if (Object.keys(prevMetadata).filter((key) => key !== 'icc' && key !== 'iptc').length > 0) {
+			// Put all data under 'exif' and rename/move keys afterwards
+			const newMetadata: { exif: Record<string, unknown>; icc?: unknown; iptc?: unknown } = { exif: prevMetadata };
+
+			if (newMetadata.exif.ifd0) {
+				newMetadata.exif.image = newMetadata.exif.ifd0;
+				delete newMetadata.exif.ifd0;
+			}
+			if (newMetadata.exif.ifd1) {
+				newMetadata.exif.thumbnail = newMetadata.exif.ifd1;
+				delete newMetadata.exif.ifd1;
+			}
+			if (newMetadata.exif.interop) {
+				newMetadata.exif.interoperability = newMetadata.exif.interop;
+				delete newMetadata.exif.interop;
+			}
+			if (newMetadata.exif.icc) {
+				newMetadata.icc = newMetadata.exif.icc;
+				delete newMetadata.exif.icc;
+			}
+			if (newMetadata.exif.iptc) {
+				newMetadata.iptc = newMetadata.exif.iptc;
+				delete newMetadata.exif.iptc;
+			}
+
+			await knex('directus_files')
+				.update({ metadata: JSON.stringify(newMetadata) })
+				.where({ id });
+		}
+	}
+}