/*************************************************************************
 *
 * Troven CONFIDENTIAL
 * __________________
 *
 *  (c) 2017-2020 Troven Ventures Pty Ltd
 *  All Rights Reserved.
 *
 * NOTICE:  All information contained herein is, and remains
 * the property of Troven Pty Ltd and its licensors,
 * if any.  The intellectual and technical concepts contained
 * herein are proprietary to Troven Pty Ltd
 * and its suppliers and may be covered by International and Regional Patents,
 * patents in process, and are protected by trade secret or copyright law.
 * Dissemination of this information or reproduction of this material
 * is strictly forbidden unless prior written permission is obtained
 * from Troven Pty Ltd.
 */

import { IOperation, IChassisMiddleware } from "../interfaces";

import * as os from "os";
import { Utils } from "../helpers";

/**
 * Request UUID
 * ------------
 * Feature generates a UUIDv5 and inject into x-request-id header
 *
 * @type {{name: string, title: string, description: string, options: {header: string}, fn: module.exports.fn}}
 */
export default class request_uuid implements IChassisMiddleware {
    name = "api.request_uuid";
    title = "Inject a 'x-request-id' into request and response headers";

    public options = {
        header: "X-REQUEST-IDd",
    };

    header = function () {
        return this.options.header;
    };

    fn(operation: IOperation, options: any): Function {
        let context = operation.context;

        let seed = os.hostname() + Date.now();

        return function (req, res, next) {
            let ip =
                req.headers["x-forwarded-for"] || req.connection.remoteAddress;
            let request_uuid = Utils.uuid(seed + ip);

            // inject a header into both request & response
            req.header(this.options.header, request_uuid);
            res.header(this.options.header, request_uuid);

            // auditing - defaults to true
            if (!(options.audit === false)) {
                context.audit({
                    uuid: context.uuid,
                    request_id: request_uuid,
                    code: "api:request_id",
                    message: req.method + " " + req.path,
                });
            }

            req.a6s_uuid = request_uuid;

            // continue processing request ...
            next();
        };
    }
}