auth with openstreetmap

oauth.js

function(token, tokenSecret, ctx, cb) {
    var OAuth = new require("oauth").OAuth;
    var parser = require('xml2json');
    var oauth = new OAuth(ctx.requestTokenURL, ctx.accessTokenURL, ctx.client_id, ctx.client_secret, "1.0", null, "HMAC-SHA1");
    oauth.get("https://api.openstreetmap.org/api/0.6/user/details", token, tokenSecret, function(e, xml, r) {
        console.log(xml);
        if (e) return cb(e);
        if (r.statusCode !== 200) return cb(new Error("StatusCode: " + r.statusCode));
        try {
            var jsonResp = JSON.parse(parser.toJson(xml));
            var user = jsonResp.user;
            cb(null, user);
        }
        catch (e) {
            console.log(e);
            cb(new UnauthorizedError("[+] fetchUserProfile: OSM fetch script failed. Check Webtask logs"));
        }
    });
}