/**
 * Copyright 2015 IBM Corp.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 **/

var util = require('util');

var readRE = /^(.*)\.read$/
var writeRE = /^(.*)\.write$/

function needsPermission(perm) {
    return function(req,res,next) {
        if (!req.user) {
            return next();
        }
        if (hasPermission(req.user,perm)) {
            return next();
        }
        return res.send(401);
    }
}

function hasPermission(user,permission) {
    if (!user.permissions) {
        return false;
    }
    if (user.permissions == "*") {
        return true;
    }
    if (user.permissions == "read") {
        return readRE.test(permission);
    }
}

module.exports = {
    hasPermission: hasPermission,
    needsPermission: needsPermission,
    
}