overleaf/services/filestore/app/coffee/ImageOptimiser.js

/*
 * decaffeinate suggestions:
 * DS102: Remove unnecessary code created because of implicit returns
 * DS207: Consider shorter variations of null checks
 * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
 */
const {
    exec
} = require('child_process');
const logger = require("logger-sharelatex");
const Settings = require("settings-sharelatex");

module.exports = { 

	compressPng(localPath, callback){
		const startTime = new Date();
		logger.log({localPath}, "optimising png path");
		const args = `optipng ${localPath}`;
		const opts = {
			timeout: 30 * 1000,
			killSignal: "SIGKILL"
		};
		if (!Settings.enableConversions) {
			const error = new Error("Image conversions are disabled");
			return callback(error);
		}
		return exec(args, opts,function(err, stdout, stderr){
			if ((err != null) && (err.signal === 'SIGKILL')) {
				logger.warn({err, stderr, localPath}, "optimiser timeout reached");
				err = null;
			} else if (err != null) {
				logger.err({err, stderr, localPath}, "something went wrong converting compressPng");
			} else {
				logger.log({localPath}, "finished compressPng file");
			}
			return callback(err);
		});
	}
};