123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206 |
- /*!
- * body-parser
- * Copyright(c) 2014 Jonathan Ong
- * Copyright(c) 2014 Douglas Christopher Wilson
- * MIT Licensed
- */
-
- /**
- * Module dependencies.
- */
-
- var bytes = require('bytes')
- var deprecate = require('depd')('body-parser')
- var read = require('../read')
- var typer = require('media-typer')
- var typeis = require('type-is')
-
- /**
- * Module exports.
- */
-
- module.exports = urlencoded
-
- /**
- * Cache of parser modules.
- */
-
- var parsers = Object.create(null)
-
- /**
- * Create a middleware to parse urlencoded bodies.
- *
- * @param {object} [options]
- * @return {function}
- * @api public
- */
-
- function urlencoded(options){
- options = options || {};
-
- // notice because option default will flip in next major
- if (options.extended === undefined) {
- deprecate('undefined extended: provide extended option')
- }
-
- var extended = options.extended !== false
- var inflate = options.inflate !== false
- var limit = typeof options.limit !== 'number'
- ? bytes(options.limit || '100kb')
- : options.limit
- var type = options.type || 'urlencoded'
- var verify = options.verify || false
-
- if (verify !== false && typeof verify !== 'function') {
- throw new TypeError('option verify must be function')
- }
-
- var queryparse = extended
- ? extendedparser(options)
- : simpleparser(options)
-
- function parse(body) {
- return body.length
- ? queryparse(body)
- : {}
- }
-
- return function urlencodedParser(req, res, next) {
- if (req._body) return next();
- req.body = req.body || {}
-
- if (!typeis(req, type)) return next();
-
- var charset = typer.parse(req).parameters.charset || 'utf-8'
- if (charset.toLowerCase() !== 'utf-8') {
- var err = new Error('unsupported charset')
- err.status = 415
- next(err)
- return
- }
-
- // read
- read(req, res, next, parse, {
- encoding: charset,
- inflate: inflate,
- limit: limit,
- verify: verify
- })
- }
- }
-
- /**
- * Get the extended query parser.
- *
- * @param {object} options
- */
-
- function extendedparser(options) {
- var parameterLimit = options.parameterLimit !== undefined
- ? options.parameterLimit
- : 1000
- var parse = parser('qs')
-
- if (isNaN(parameterLimit) || parameterLimit < 1) {
- throw new TypeError('option parameterLimit must be a positive number')
- }
-
- if (isFinite(parameterLimit)) {
- parameterLimit = parameterLimit | 0
- }
-
- var opts = {
- arrayLimit: 100,
- parameterLimit: parameterLimit
- }
-
- return function queryparse(body) {
- if (overlimit(body, parameterLimit)) {
- var err = new Error('too many parameters')
- err.status = 413
- throw err
- }
-
- return parse(body, opts)
- }
- }
-
- /**
- * Determine if the parameter count is over the limit.
- *
- * @param {string} body
- * @param {number} limit
- * @api private
- */
-
- function overlimit(body, limit) {
- if (limit === Infinity) {
- return false
- }
-
- var count = 0
- var index = 0
-
- while ((index = body.indexOf('&', index)) !== -1) {
- count++
- index++
-
- if (count === limit) {
- return true
- }
- }
-
- return false
- }
-
- /**
- * Get parser for module name dynamically.
- *
- * @param {string} name
- * @return {function}
- * @api private
- */
-
- function parser(name) {
- var mod = parsers[name]
-
- if (mod) {
- return mod.parse
- }
-
- // load module
- mod = parsers[name] = require(name)
-
- return mod.parse
- }
-
- /**
- * Get the simple query parser.
- *
- * @param {object} options
- */
-
- function simpleparser(options) {
- var parameterLimit = options.parameterLimit !== undefined
- ? options.parameterLimit
- : 1000
- var parse = parser('querystring')
-
- if (isNaN(parameterLimit) || parameterLimit < 1) {
- throw new TypeError('option parameterLimit must be a positive number')
- }
-
- if (isFinite(parameterLimit)) {
- parameterLimit = parameterLimit | 0
- }
-
- return function queryparse(body) {
- if (overlimit(body, parameterLimit)) {
- var err = new Error('too many parameters')
- err.status = 413
- throw err
- }
-
- return parse(body, undefined, undefined, {maxKeys: parameterLimit})
- }
- }
|