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523 lines
10 KiB
JavaScript
523 lines
10 KiB
JavaScript
/*!
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* morgan
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* Copyright(c) 2010 Sencha Inc.
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* Copyright(c) 2011 TJ Holowaychuk
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* Copyright(c) 2014 Jonathan Ong
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* Copyright(c) 2014-2017 Douglas Christopher Wilson
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* MIT Licensed
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*/
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'use strict'
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/**
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* Module exports.
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* @public
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*/
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module.exports = morgan
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module.exports.compile = compile
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module.exports.format = format
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module.exports.token = token
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/**
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* Module dependencies.
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* @private
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*/
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var auth = require('basic-auth')
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var debug = require('debug')('morgan')
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var deprecate = require('depd')('morgan')
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var onFinished = require('on-finished')
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var onHeaders = require('on-headers')
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/**
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* Array of CLF month names.
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* @private
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*/
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var CLF_MONTH = [
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'Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun',
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'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'
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]
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/**
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* Default log buffer duration.
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* @private
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*/
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var DEFAULT_BUFFER_DURATION = 1000
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/**
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* Create a logger middleware.
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*
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* @public
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* @param {String|Function} format
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* @param {Object} [options]
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* @return {Function} middleware
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*/
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function morgan (format, options) {
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var fmt = format
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var opts = options || {}
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if (format && typeof format === 'object') {
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opts = format
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fmt = opts.format || 'default'
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// smart deprecation message
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deprecate('morgan(options): use morgan(' + (typeof fmt === 'string' ? JSON.stringify(fmt) : 'format') + ', options) instead')
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}
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if (fmt === undefined) {
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deprecate('undefined format: specify a format')
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}
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// output on request instead of response
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var immediate = opts.immediate
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// check if log entry should be skipped
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var skip = opts.skip || false
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// format function
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var formatLine = typeof fmt !== 'function'
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? getFormatFunction(fmt)
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: fmt
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// stream
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var buffer = opts.buffer
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var stream = opts.stream || process.stdout
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// buffering support
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if (buffer) {
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deprecate('buffer option')
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// flush interval
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var interval = typeof buffer !== 'number'
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? DEFAULT_BUFFER_DURATION
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: buffer
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// swap the stream
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stream = createBufferStream(stream, interval)
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}
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return function logger (req, res, next) {
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// request data
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req._startAt = undefined
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req._startTime = undefined
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req._remoteAddress = getip(req)
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// response data
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res._startAt = undefined
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res._startTime = undefined
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// record request start
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recordStartTime.call(req)
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function logRequest () {
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if (skip !== false && skip(req, res)) {
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debug('skip request')
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return
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}
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var line = formatLine(morgan, req, res)
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if (line == null) {
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debug('skip line')
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return
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}
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debug('log request')
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stream.write(line + '\n')
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};
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if (immediate) {
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// immediate log
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logRequest()
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} else {
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// record response start
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onHeaders(res, recordStartTime)
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// log when response finished
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onFinished(res, logRequest)
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}
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next()
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}
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}
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/**
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* Apache combined log format.
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*/
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morgan.format('combined', ':remote-addr - :remote-user [:date[clf]] ":method :url HTTP/:http-version" :status :res[content-length] ":referrer" ":user-agent"')
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/**
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* Apache common log format.
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*/
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morgan.format('common', ':remote-addr - :remote-user [:date[clf]] ":method :url HTTP/:http-version" :status :res[content-length]')
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/**
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* Default format.
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*/
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morgan.format('default', ':remote-addr - :remote-user [:date] ":method :url HTTP/:http-version" :status :res[content-length] ":referrer" ":user-agent"')
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deprecate.property(morgan, 'default', 'default format: use combined format')
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/**
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* Short format.
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*/
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morgan.format('short', ':remote-addr :remote-user :method :url HTTP/:http-version :status :res[content-length] - :response-time ms')
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/**
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* Tiny format.
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*/
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morgan.format('tiny', ':method :url :status :res[content-length] - :response-time ms')
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/**
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* dev (colored)
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*/
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morgan.format('dev', function developmentFormatLine (tokens, req, res) {
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// get the status code if response written
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var status = headersSent(res)
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? res.statusCode
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: undefined
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// get status color
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var color = status >= 500 ? 31 // red
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: status >= 400 ? 33 // yellow
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: status >= 300 ? 36 // cyan
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: status >= 200 ? 32 // green
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: 0 // no color
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// get colored function
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var fn = developmentFormatLine[color]
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if (!fn) {
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// compile
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fn = developmentFormatLine[color] = compile('\x1b[0m:method :url \x1b[' +
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color + 'm:status \x1b[0m:response-time ms - :res[content-length]\x1b[0m')
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}
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return fn(tokens, req, res)
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})
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/**
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* request url
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*/
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morgan.token('url', function getUrlToken (req) {
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return req.originalUrl || req.url
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})
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/**
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* request method
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*/
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morgan.token('method', function getMethodToken (req) {
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return req.method
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})
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/**
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* response time in milliseconds
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*/
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morgan.token('response-time', function getResponseTimeToken (req, res, digits) {
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if (!req._startAt || !res._startAt) {
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// missing request and/or response start time
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return
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}
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// calculate diff
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var ms = (res._startAt[0] - req._startAt[0]) * 1e3 +
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(res._startAt[1] - req._startAt[1]) * 1e-6
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// return truncated value
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return ms.toFixed(digits === undefined ? 3 : digits)
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})
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/**
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* current date
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*/
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morgan.token('date', function getDateToken (req, res, format) {
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var date = new Date()
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switch (format || 'web') {
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case 'clf':
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return clfdate(date)
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case 'iso':
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return date.toISOString()
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case 'web':
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return date.toUTCString()
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}
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})
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/**
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* response status code
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*/
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morgan.token('status', function getStatusToken (req, res) {
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return headersSent(res)
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? String(res.statusCode)
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: undefined
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})
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/**
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* normalized referrer
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*/
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morgan.token('referrer', function getReferrerToken (req) {
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return req.headers['referer'] || req.headers['referrer']
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})
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/**
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* remote address
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*/
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morgan.token('remote-addr', getip)
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/**
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* remote user
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*/
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morgan.token('remote-user', function getRemoteUserToken (req) {
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// parse basic credentials
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var credentials = auth(req)
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// return username
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return credentials
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? credentials.name
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: undefined
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})
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/**
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* HTTP version
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*/
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morgan.token('http-version', function getHttpVersionToken (req) {
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return req.httpVersionMajor + '.' + req.httpVersionMinor
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})
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/**
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* UA string
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*/
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morgan.token('user-agent', function getUserAgentToken (req) {
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return req.headers['user-agent']
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})
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/**
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* request header
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*/
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morgan.token('req', function getRequestToken (req, res, field) {
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// get header
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var header = req.headers[field.toLowerCase()]
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return Array.isArray(header)
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? header.join(', ')
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: header
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})
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/**
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* response header
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*/
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morgan.token('res', function getResponseHeader (req, res, field) {
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if (!headersSent(res)) {
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return undefined
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}
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// get header
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var header = res.getHeader(field)
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return Array.isArray(header)
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? header.join(', ')
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: header
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})
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/**
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* Format a Date in the common log format.
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*
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* @private
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* @param {Date} dateTime
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* @return {string}
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*/
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function clfdate (dateTime) {
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var date = dateTime.getUTCDate()
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var hour = dateTime.getUTCHours()
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var mins = dateTime.getUTCMinutes()
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var secs = dateTime.getUTCSeconds()
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var year = dateTime.getUTCFullYear()
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var month = CLF_MONTH[dateTime.getUTCMonth()]
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return pad2(date) + '/' + month + '/' + year +
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':' + pad2(hour) + ':' + pad2(mins) + ':' + pad2(secs) +
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' +0000'
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}
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/**
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* Compile a format string into a function.
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*
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* @param {string} format
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* @return {function}
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* @public
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*/
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function compile (format) {
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if (typeof format !== 'string') {
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throw new TypeError('argument format must be a string')
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}
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var fmt = String(JSON.stringify(format))
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var js = ' "use strict"\n return ' + fmt.replace(/:([-\w]{2,})(?:\[([^\]]+)\])?/g, function (_, name, arg) {
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var tokenArguments = 'req, res'
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var tokenFunction = 'tokens[' + String(JSON.stringify(name)) + ']'
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if (arg !== undefined) {
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tokenArguments += ', ' + String(JSON.stringify(arg))
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}
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return '" +\n (' + tokenFunction + '(' + tokenArguments + ') || "-") + "'
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})
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// eslint-disable-next-line no-new-func
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return new Function('tokens, req, res', js)
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}
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/**
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* Create a basic buffering stream.
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*
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* @param {object} stream
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* @param {number} interval
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* @public
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*/
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function createBufferStream (stream, interval) {
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var buf = []
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var timer = null
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// flush function
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function flush () {
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timer = null
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stream.write(buf.join(''))
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buf.length = 0
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}
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// write function
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function write (str) {
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if (timer === null) {
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timer = setTimeout(flush, interval)
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}
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buf.push(str)
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}
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// return a minimal "stream"
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return { write: write }
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}
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/**
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* Define a format with the given name.
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*
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* @param {string} name
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* @param {string|function} fmt
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* @public
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*/
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function format (name, fmt) {
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morgan[name] = fmt
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return this
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}
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/**
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* Lookup and compile a named format function.
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*
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* @param {string} name
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* @return {function}
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* @public
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*/
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function getFormatFunction (name) {
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// lookup format
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var fmt = morgan[name] || name || morgan.default
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// return compiled format
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return typeof fmt !== 'function'
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? compile(fmt)
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: fmt
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}
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/**
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* Get request IP address.
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*
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* @private
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* @param {IncomingMessage} req
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* @return {string}
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*/
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function getip (req) {
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return req.ip ||
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req._remoteAddress ||
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(req.connection && req.connection.remoteAddress) ||
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undefined
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}
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/**
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* Determine if the response headers have been sent.
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*
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* @param {object} res
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* @returns {boolean}
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* @private
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*/
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function headersSent (res) {
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return typeof res.headersSent !== 'boolean'
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? Boolean(res._header)
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: res.headersSent
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}
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/**
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* Pad number to two digits.
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*
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* @private
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* @param {number} num
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* @return {string}
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*/
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function pad2 (num) {
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var str = String(num)
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return (str.length === 1 ? '0' : '') + str
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}
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/**
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* Record the start time.
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* @private
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*/
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function recordStartTime () {
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this._startAt = process.hrtime()
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this._startTime = new Date()
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}
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/**
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* Define a token function with the given name,
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* and callback fn(req, res).
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*
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* @param {string} name
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* @param {function} fn
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* @public
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*/
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function token (name, fn) {
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morgan[name] = fn
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return this
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}
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