123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165 |
- /*!
- * body-parser
- * Copyright(c) 2014 Jonathan Ong
- * Copyright(c) 2014-2015 Douglas Christopher Wilson
- * MIT Licensed
- */
- /**
- * Module dependencies.
- */
- var bytes = require('bytes')
- var contentType = require('content-type')
- var debug = require('debug')('body-parser:json')
- var read = require('../read')
- var typeis = require('type-is')
- /**
- * Module exports.
- */
- module.exports = json
- /**
- * RegExp to match the first non-space in a string.
- *
- * Allowed whitespace is defined in RFC 7159:
- *
- * ws = *(
- * %x20 / ; Space
- * %x09 / ; Horizontal tab
- * %x0A / ; Line feed or New line
- * %x0D ) ; Carriage return
- */
- var firstcharRegExp = /^[\x20\x09\x0a\x0d]*(.)/
- /**
- * Create a middleware to parse JSON bodies.
- *
- * @param {object} [options]
- * @return {function}
- * @api public
- */
- function json(options) {
- options = options || {}
- var limit = typeof options.limit !== 'number'
- ? bytes(options.limit || '100kb')
- : options.limit
- var inflate = options.inflate !== false
- var reviver = options.reviver
- var strict = options.strict !== false
- var type = options.type || 'json'
- var verify = options.verify || false
- if (verify !== false && typeof verify !== 'function') {
- throw new TypeError('option verify must be function')
- }
- // create the appropriate type checking function
- var shouldParse = typeof type !== 'function'
- ? typeChecker(type)
- : type
- function parse(body) {
- if (body.length === 0) {
- // special-case empty json body, as it's a common client-side mistake
- // TODO: maybe make this configurable or part of "strict" option
- return {}
- }
- if (strict) {
- var first = firstchar(body)
- if (first !== '{' && first !== '[') {
- debug('strict violation')
- throw new Error('invalid json')
- }
- }
- debug('parse json')
- return JSON.parse(body, reviver)
- }
- return function jsonParser(req, res, next) {
- if (req._body) {
- return debug('body already parsed'), next()
- }
- req.body = req.body || {}
- // skip requests without bodies
- if (!typeis.hasBody(req)) {
- return debug('skip empty body'), next()
- }
- debug('content-type %s', JSON.stringify(req.headers['content-type']))
- // determine if request should be parsed
- if (!shouldParse(req)) {
- return debug('skip parsing'), next()
- }
- // assert charset per RFC 7159 sec 8.1
- var charset = getCharset(req) || 'utf-8'
- if (charset.substr(0, 4) !== 'utf-') {
- var err = new Error('unsupported charset "' + charset.toUpperCase() + '"')
- err.charset = charset
- err.status = 415
- return debug('invalid charset'), next(err)
- }
- // read
- read(req, res, next, parse, debug, {
- encoding: charset,
- inflate: inflate,
- limit: limit,
- verify: verify
- })
- }
- }
- /**
- * Get the first non-whitespace character in a string.
- *
- * @param {string} str
- * @return {function}
- * @api public
- */
- function firstchar(str) {
- var match = firstcharRegExp.exec(str)
- return match ? match[1] : ''
- }
- /**
- * Get the charset of a request.
- *
- * @param {object} req
- * @api private
- */
- function getCharset(req) {
- try {
- return contentType.parse(req).parameters.charset.toLowerCase()
- } catch (e) {
- return undefined
- }
- }
- /**
- * Get the simple type checker.
- *
- * @param {string} type
- * @return {function}
- */
- function typeChecker(type) {
- return function checkType(req) {
- return Boolean(typeis(req, type))
- }
- }
|