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

Rytass Utils Storages Images Converter

'use strict';

var sharp = require('sharp');
var stream = require('stream');
var fileType = require('file-type');

const SupportSources = [
    'jpg',
    'png',
    'webp',
    'gif',
    'avif',
    'tif',
    'svg'
];

class UnsupportedSource extends Error {
    message = 'UnsupportedSource';
}

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 fileType.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 stream.Readable) {
            file.pipe(converter);
        }
        if (file instanceof Buffer) {
            return converter.toBuffer();
        }
        return converter;
    }
}

exports.ImageTranscoder = ImageTranscoder;