salix/loopback/server/middleware/current-user.js

module.exports = function(options) {
    return function(req, res, next) {
        if (!req.accessToken)
            return next();

        let LoopBackContext = require('loopback-context');
        let loopbackContext = LoopBackContext.getCurrentContext();

        if (loopbackContext)
            loopbackContext.set('currentUser', req.accessToken.userId);

        next();
    };
};