const wopiValidator = require('wopi-proof-validator');

const isValid = wopiValidator.check(
    {
        url: mydomain + req.originalUrl,
        accessToken: req.query.access_token,
        timestamp: req.headers['x-wopi-timestamp']  //!String! Too big for JavaScript numeric types
    },
    {
        proof: req.headers['x-wopi-proof'],
        proofold: req.headers['x-wopi-proofold']
    },
    {
        modulus: '...',
        exponent: '...',
        oldmodulus: '...',
        oldexponent: '...'
    }
);