rudeshark.net/src/drive/gen-thumbnail.ts

26 lines
567 B
TypeScript

import * as stream from 'stream';
import * as Gm from 'gm';
import { IDriveFile, getDriveFileBucket } from '../models/drive-file';
const gm = Gm.subClass({
imageMagick: true
});
export default async function(file: IDriveFile): Promise<stream.Readable> {
if (!/^image\/.*$/.test(file.contentType)) return null;
const bucket = await getDriveFileBucket();
const readable = bucket.openDownloadStream(file._id);
const g = gm(readable);
const stream = g
.resize(256, 256)
.compress('jpeg')
.quality(70)
.interlace('line')
.stream();
return stream;
}