var LayergroupToken = require('../../models/layergroup-token');

module.exports = function layergroupTokenMiddleware(req, res, next) {
    if (!req.params.hasOwnProperty('token')) {
        return next();
    }

    var user = req.context.user;

    var layergroupToken = LayergroupToken.parse(req.params.token);
    req.params.token = layergroupToken.token;
    req.params.cache_buster = layergroupToken.cacheBuster;

    if (layergroupToken.signer) {
        req.params.signer = layergroupToken.signer;
        if (!req.params.signer) {
            req.params.signer = user;
        } else if (req.params.signer !== user) {
            var err = new Error(`Cannot use map signature of user "${req.params.signer}" on db of user "${user}"`);
            err.type = 'auth';
            err.http_status = 403;
            if (req.query && req.query.callback) {
                err.http_status = 200;
            }
            
            req.profiler.done('req2params');
            return next(err);
        }
    }

    return next();
};