simple node app

gistfile1.txt

index.js

const express = require('express')
const logger = require('./logger')
const common = {}

common.app = () => {
    const app = express()
    app.disable('x-powered-by')
    return app
}

const app = common.app()

app.use((req, res, next) => {
    req.locals = req.locals || {}
    next()
})

app.use(logger.router)

app.get('/', function (req, res) {
    res.send('Hello World')
})

app.listen(3000)

================================================================================================
logger.js


const logFuncToOverride = ['debug', 'error', 'log', 'info', 'warn']
const _ = require('underscore')
const url = require('url')

const MISSING = 'MISSING'
const COOKIE = 'COOKIE'
const BEARER_TOKEN = 'BEARER_TOKEN'
const LOG_LEVEL = 'log_level'

module.exports = {
    MISSING,
    COOKIE,
    BEARER_TOKEN,
    LOG_LEVEL: LOG_LEVEL,
    router: (req, res, next) => {
        try {
            let reqid
            let clientid

            _.find(
                req.query,
                (val, key) => {
                    if (reqid && clientid) {
                        return true
                    }
                    if (!key) {
                        return false
                    }
                    switch (key.toLowerCase()) {
                        case 'reqid':
                            reqid = req.query[key]
                            break
                        case 'clientid':
                            clientid = req.query[key]
                            break
                    }
                }
            )

            req.console = req.console || {}

            logFuncToOverride.forEach((funcName) => {
                req.console[funcName] = console[funcName].bind(console, `reqid="${reqid || MISSING}"  clientid="${clientid} || MISSING}"`)
            })

            const urlObj = url.parse(req.url, true)

            req.locals = req.locals || {}
            req.locals.clientid = clientid || MISSING
            req.locals.reqPathname = urlObj.pathname

            let authorizationType = MISSING
            if (req.headers.cookie && req.headers.cookie.length > 50) {
                authorizationType = COOKIE
            } else if (req.headers.authorization && req.headers.cookie.length > 20) {
                authorizationType = BEARER_TOKEN
            }
            req.locals.authorization_type = authorizationType

            req.console.log('REQUEST_STARTED',
                `req_method="${req.method}"`,
                `req_url="${req.url}"`,
                `req_pathname="${urlObj.pathname}"`,
                `req.header_client="${req.headers.client || MISSING}"`,
                `req_locals_authorization_type="${req.locals.authorization_type}"`,
                `req_headers_authorization_has_value="${!!req.headers.authorization}"`,
                `req_headers_authorization_length="${!!req.headers.authorization && req.headers.authorization.length}"`,
                `req_headers_cookie_has_value="${!!req.headers.cookie}"`,
                `req_headers_cookie_length="${req.headers.cookie && req.headers.cookie.length}"`,
                `req_local_address="${req.socket.localAddress}"`,
                `req_local_port="${req.socket.localPort}"`
            )
        } catch (err) {
            req.console.error('Error while extracting reqid and clientid.  err', err)
        } finally {
            next()
        }
    }
}