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/*!
* body-parser
* Copyright(c) 2014 Jonathan Ong
* Copyright(c) 2014-2015 Douglas Christopher Wilson
* MIT Licensed
*/
'use strict'
/**
* Module dependencies.
* @private
*/
var bytes = require('bytes')
var contentType = require('content-type')
var createError = require('http-errors')
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 FIRST_CHAR_REGEXP = /^[\x20\x09\x0a\x0d]*(.)/ // eslint-disable-line no-control-regex
/**
* Create a middleware to parse JSON bodies.
*
* @param {object} [options]
* @return {function}
* @public
*/
function json (options) {
var opts = options || {}
var limit = typeof opts.limit !== 'number'
? bytes.parse(opts.limit || '100kb')
: opts.limit
var inflate = opts.inflate !== false
var reviver = opts.reviver
var strict = opts.strict !== false
var type = opts.type || 'application/json'
var verify = opts.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 createStrictSyntaxError(body, first)
}
}
try {
debug('parse json')
return JSON.parse(body, reviver)
} catch (e) {
throw normalizeJsonSyntaxError(e, {
stack: e.stack
})
}
}
return function jsonParser (req, res, next) {
if (req._body) {
debug('body already parsed')
next()
return
}
req.body = req.body || {}
// skip requests without bodies
if (!typeis.hasBody(req)) {
debug('skip empty body')
next()
return
}
debug('content-type %j', req.headers['content-type'])
// determine if request should be parsed
if (!shouldParse(req)) {
debug('skip parsing')
next()
return
}
// assert charset per RFC 7159 sec 8.1
var charset = getCharset(req) || 'utf-8'
if (charset.substr(0, 4) !== 'utf-') {
debug('invalid charset')
next(createError(415, 'unsupported charset "' + charset.toUpperCase() + '"', {
charset: charset,
type: 'charset.unsupported'
}))
return
}
// read
read(req, res, next, parse, debug, {
encoding: charset,
inflate: inflate,
limit: limit,
verify: verify
})
}
}
/**
* Create strict violation syntax error matching native error.
*
* @param {string} str
* @param {string} char
* @return {Error}
* @private
*/
function createStrictSyntaxError (str, char) {
var index = str.indexOf(char)
var partial = str.substring(0, index) + '#'
try {
JSON.parse(partial); /* istanbul ignore next */ throw new SyntaxError('strict violation')
} catch (e) {
return normalizeJsonSyntaxError(e, {
message: e.message.replace('#', char),
stack: e.stack
})
}
}
/**
* Get the first non-whitespace character in a string.
*
* @param {string} str
* @return {function}
* @private
*/
function firstchar (str) {
return FIRST_CHAR_REGEXP.exec(str)[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
}
}
/**
* Normalize a SyntaxError for JSON.parse.
*
* @param {SyntaxError} error
* @param {object} obj
* @return {SyntaxError}
*/
function normalizeJsonSyntaxError (error, obj) {
var keys = Object.getOwnPropertyNames(error)
for (var i = 0; i < keys.length; i++) {
var key = keys[i]
if (key !== 'stack' && key !== 'message') {
delete error[key]
}
}
var props = Object.keys(obj)
for (var j = 0; j < props.length; j++) {
var prop = props[j]
error[prop] = obj[prop]
}
return error
}
/**
* Get the simple type checker.
*
* @param {string} type
* @return {function}
*/
function typeChecker (type) {
return function checkType (req) {
return Boolean(typeis(req, type))
}
}
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