サムネイルを予め生成するように

src/models/drive-file-thumbnail.ts

@@ -0,0 +1,61 @@
+import * as mongo from 'mongodb';
+import monkDb, { nativeDbConn } from '../db/mongodb';
+
+const DriveFileThumbnail = monkDb.get<IDriveFileThumbnail>('driveFileThumbnails.files');
+DriveFileThumbnail.createIndex('metadata.originalId', { sparse: true, unique: true });
+export default DriveFileThumbnail;
+
+export const DriveFileThumbnailChunk = monkDb.get('driveFileThumbnails.chunks');
+
+export const getDriveFileThumbnailBucket = async (): Promise<mongo.GridFSBucket> => {
+	const db = await nativeDbConn();
+	const bucket = new mongo.GridFSBucket(db, {
+		bucketName: 'driveFileThumbnails'
+	});
+	return bucket;
+};
+
+export type IMetadata = {
+	originalId: mongo.ObjectID;
+};
+
+export type IDriveFileThumbnail = {
+	_id: mongo.ObjectID;
+	uploadDate: Date;
+	md5: string;
+	filename: string;
+	contentType: string;
+	metadata: IMetadata;
+};
+
+/**
+ * DriveFileThumbnailを物理削除します
+ */
+export async function deleteDriveFileThumbnail(driveFile: string | mongo.ObjectID | IDriveFileThumbnail) {
+	let d: IDriveFileThumbnail;
+
+	// Populate
+	if (mongo.ObjectID.prototype.isPrototypeOf(driveFile)) {
+		d = await DriveFileThumbnail.findOne({
+			_id: driveFile
+		});
+	} else if (typeof driveFile === 'string') {
+		d = await DriveFileThumbnail.findOne({
+			_id: new mongo.ObjectID(driveFile)
+		});
+	} else {
+		d = driveFile as IDriveFileThumbnail;
+	}
+
+	if (d == null) return;
+
+	// このDriveFileThumbnailのチャンクをすべて削除
+	await DriveFileThumbnailChunk.remove({
+		files_id: d._id
+	});
+
+	// このDriveFileThumbnailを削除
+	await DriveFileThumbnail.remove({
+		_id: d._id
+	});
+}