@sap/ams-dev/src/util.js

NodesJS AMS development environment

const fs = require('node:fs');

function debouncePromise(fn, ms = 0) {
	let timeoutId;
	const pending = [];

	return (...args) =>
		new Promise((res, rej) => {
			clearTimeout(timeoutId);
			timeoutId = setTimeout(() => {
				const currentPending = [...pending];
				pending.length = 0;
				Promise.resolve(fn.call(null, ...args)).then(
					data => {
						currentPending.forEach(({ resolve }) => resolve(data));
					},
					error => {
						currentPending.forEach(({ reject }) => reject(error));
					}
				);
			}, ms);
			pending.push({ resolve: res, reject: rej });
		});
}

/**
* Creates the given folders if they do not exist.
* @param {Array<string>} folders array of folder paths
*/
function prepareFolders(folders) {
	return Promise.all(
		folders.map(f => {
			if (!fs.existsSync(f)) {
				return fs.mkdirSync(f, { recursive: true });
			}
		})
	);
}

/**
* Removes CRLF characters from a value so that untrusted (e.g. server-provided)
* text cannot be used to forge additional log entries (log injection).
* @param {*} value the value to sanitize; non-string values are returned unchanged
* @returns {*} the sanitized value with carriage returns and line feeds stripped
*/
function sanitizeForLog(value) {
	if (typeof value !== 'string') {
		return value;
	}
	return value.replace(/[\r\n]+/g, ' ');
}

module.exports = {
	debouncePromise,
	prepareFolders,
	sanitizeForLog
}