modules/backend/middlewares/host.js

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */

'use strict';

// Fire me up!

module.exports = {
    implements: 'middlewares:host',
    factory: () => {
        return (req, res, next) => {
            req.origin = function() {
                if (req.headers.origin)
                    return req.headers.origin;

                const proto = req.headers['x-forwarded-proto'] || req.protocol;

                const host = req.headers['x-forwarded-host'] || req.get('host');

                return `${proto}://${host}`;
            };

            next();
        };
    }
};