generate-nginx-hash.js

var crypto = require("crypto");

function generateSecurePathHash(url, expires, secret) {
    if (!url || !expires || !secret) {
        return undefined;
    }
    
    var input = expires + url + " " + secret;
    var binaryHash = crypto.createHash("md5").update(input).digest();
    var base64Value = new Buffer(binaryHash).toString('base64');
    return base64Value.replace(/=/g, '').replace(/\+/g, '-').replace(/\//g, '_');
}

generateSecurePathHash('/img/file.doc', Math.ceil(Date.now() / 1000) + 8, "6q3R9jhzG5"); // link expires in 8 seconds