@rytass/file-converter-adapter-image-transcoder/image-transcoder.js

Rytass Utils Storages Images Converter

import sharp from 'sharp';
import { Readable } from 'stream';
import { fromBuffer } from 'file-type';
import { SupportSources } from './constants.js';
import { UnsupportedSource } from './errors.js';

sharp.cache(false);
class ImageTranscoder {
    options;
    constructor(options){
        this.options = options;
        sharp.concurrency(options.concurrency ?? 1);
    }
    async convert(file) {
        let converter;
        if (file instanceof Buffer) {
            const extension = await fromBuffer(file);
            if (!extension || !~SupportSources.indexOf(extension.ext)) {
                throw new UnsupportedSource();
            }
            converter = sharp(file);
        } else {
            converter = sharp();
        }
        converter.toFormat(this.options.targetFormat, this.options);
        // Stream cannot throw when format not supported
        if (file instanceof Readable) {
            file.pipe(converter);
        }
        if (file instanceof Buffer) {
            return converter.toBuffer();
        }
        return converter;
    }
}

export { ImageTranscoder };