oauth-simple-signature-check

This package is a simple way to quickly test an OAuth 1.0a signature for validity. As it is intended to be extremely simple, there are no configuration options; however, you may use it as a base if you need different behavior. The algorithm for validating OAuth signatures was adapted from this site: http://lti.tools/oauth/

It was originally designed to simplify OAuth signature validation within the LTI (Learning Tools Interopability) spec, but it can be adapted to many other uses as well.

Assumptions

The package works out-of-the-box with Express.js.

The algorithm assumes you are using HMAC-SHA1 within the OAuth 1.0a spec. Again, you can fork this package and easily change this, if needed. It also assumes you are using UTF-8 for encoding (which you should be).

How to use

Call it in your express.js app, within a route. Here is an example:

const validateOAuthSignature = require("oauth-simple-signature-check");

app.post("/", function (req, res) => {
  const isOAuthSignatureValid = validateOAuthSignature(req, process.env.CONSUMER_SECRET); 

  if (isOAuthSignatureValid)
    res.json({ data: {str: "my secret string"} });
  else
    res.json({});
});