/*!
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* body-parser
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* Copyright(c) 2014 Jonathan Ong
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* Copyright(c) 2014-2015 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 dependencies.
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* @private
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*/
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var bytes = require('bytes')
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var contentType = require('content-type')
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var createError = require('http-errors')
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var debug = require('debug')('body-parser:json')
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var read = require('../read')
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var typeis = require('type-is')
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/**
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* Module exports.
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*/
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module.exports = json
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/**
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* RegExp to match the first non-space in a string.
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*
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* Allowed whitespace is defined in RFC 7159:
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*
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* ws = *(
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* %x20 / ; Space
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* %x09 / ; Horizontal tab
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* %x0A / ; Line feed or New line
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* %x0D ) ; Carriage return
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*/
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var FIRST_CHAR_REGEXP = /^[\x20\x09\x0a\x0d]*(.)/ // eslint-disable-line no-control-regex
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/**
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* Create a middleware to parse JSON bodies.
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*
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* @param {object} [options]
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* @return {function}
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* @public
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*/
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function json (options) {
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var opts = options || {}
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var limit = typeof opts.limit !== 'number'
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? bytes.parse(opts.limit || '100kb')
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: opts.limit
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var inflate = opts.inflate !== false
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var reviver = opts.reviver
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var strict = opts.strict !== false
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var type = opts.type || 'application/json'
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var verify = opts.verify || false
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if (verify !== false && typeof verify !== 'function') {
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throw new TypeError('option verify must be function')
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}
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// create the appropriate type checking function
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var shouldParse = typeof type !== 'function'
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? typeChecker(type)
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: type
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function parse (body) {
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if (body.length === 0) {
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// special-case empty json body, as it's a common client-side mistake
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// TODO: maybe make this configurable or part of "strict" option
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return {}
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}
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if (strict) {
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var first = firstchar(body)
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if (first !== '{' && first !== '[') {
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debug('strict violation')
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throw createStrictSyntaxError(body, first)
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}
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}
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try {
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debug('parse json')
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return JSON.parse(body, reviver)
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} catch (e) {
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throw normalizeJsonSyntaxError(e, {
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stack: e.stack
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})
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}
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}
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return function jsonParser (req, res, next) {
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if (req._body) {
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debug('body already parsed')
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next()
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return
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}
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req.body = req.body || {}
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// skip requests without bodies
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if (!typeis.hasBody(req)) {
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debug('skip empty body')
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next()
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return
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}
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debug('content-type %j', req.headers['content-type'])
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// determine if request should be parsed
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if (!shouldParse(req)) {
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debug('skip parsing')
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next()
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return
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}
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// assert charset per RFC 7159 sec 8.1
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var charset = getCharset(req) || 'utf-8'
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if (charset.substr(0, 4) !== 'utf-') {
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debug('invalid charset')
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next(createError(415, 'unsupported charset "' + charset.toUpperCase() + '"', {
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charset: charset,
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type: 'charset.unsupported'
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}))
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return
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}
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// read
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read(req, res, next, parse, debug, {
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encoding: charset,
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inflate: inflate,
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limit: limit,
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verify: verify
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})
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}
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}
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/**
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* Create strict violation syntax error matching native error.
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*
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* @param {string} str
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* @param {string} char
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* @return {Error}
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* @private
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*/
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function createStrictSyntaxError (str, char) {
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var index = str.indexOf(char)
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var partial = str.substring(0, index) + '#'
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try {
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JSON.parse(partial); /* istanbul ignore next */ throw new SyntaxError('strict violation')
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} catch (e) {
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return normalizeJsonSyntaxError(e, {
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message: e.message.replace('#', char),
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stack: e.stack
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})
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}
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}
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/**
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* Get the first non-whitespace character in a string.
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*
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* @param {string} str
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* @return {function}
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* @private
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*/
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function firstchar (str) {
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return FIRST_CHAR_REGEXP.exec(str)[1]
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}
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/**
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* Get the charset of a request.
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*
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* @param {object} req
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* @api private
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*/
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function getCharset (req) {
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try {
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return (contentType.parse(req).parameters.charset || '').toLowerCase()
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} catch (e) {
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return undefined
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}
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}
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/**
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* Normalize a SyntaxError for JSON.parse.
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*
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* @param {SyntaxError} error
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* @param {object} obj
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* @return {SyntaxError}
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*/
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function normalizeJsonSyntaxError (error, obj) {
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var keys = Object.getOwnPropertyNames(error)
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for (var i = 0; i < keys.length; i++) {
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var key = keys[i]
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if (key !== 'stack' && key !== 'message') {
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delete error[key]
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}
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}
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var props = Object.keys(obj)
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for (var j = 0; j < props.length; j++) {
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var prop = props[j]
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error[prop] = obj[prop]
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}
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return error
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}
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/**
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* Get the simple type checker.
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*
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* @param {string} type
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* @return {function}
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*/
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function typeChecker (type) {
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return function checkType (req) {
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return Boolean(typeis(req, type))
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}
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}
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