api-service-core/lib/middleware/request_uuid.js

NodeJS api-service

"use strict";
/*************************************************************************
 *
 * Troven CONFIDENTIAL
 * __________________
 *
 *  (c) 2017-2019 Troven 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
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 * 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.
 */
Object.defineProperty(exports, "__esModule", { value: true });
const uuidv5 = require("uuid/v5");
const os = require("os");
/**
 * Request UUID
 * ------------
 * Feature generates a UUIDv5 and inject into X-REQUEST-UUID header
 *
 * @type {{name: string, title: string, description: string, options: {header: string}, fn: module.exports.fn}}
 */
class request_uuid {
    constructor() {
        this.name = "api.request_uuid";
        this.title = "Inject a X-REQUEST-UUID into request and response headers";
        this.options = {
            header: "X-REQUEST-UUID"
        };
        this.header = function () {
            return this.options.header;
        };
    }
    fn(operation, options) {
        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 = uuidv5(seed + ip, uuidv5.DNS);
            // 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_uuid: request_uuid, code: "api:policy:request_uuid", message: req.method + " " + req.path });
            }
            // continue processing request ...
            next();
        };
    }
}
exports.default = request_uuid;
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