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json.js
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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 debug = require('debug')('body-parser:json')
var read = require('../read')
var { normalizeOptions } = require('../utils')
/**
* 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]*([^\x20\x09\x0a\x0d])/ // eslint-disable-line no-control-regex
var JSON_SYNTAX_CHAR = '#'
var JSON_SYNTAX_REGEXP = /#+/g
/**
* Create a middleware to parse JSON bodies.
*
* @param {Object} [options]
* @returns {Function}
* @public
*/
function json (options) {
const normalizedOptions = normalizeOptions(options, 'application/json')
var reviver = options?.reviver
var strict = options?.strict !== false
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, {
message: e.message,
stack: e.stack
})
}
}
const readOptions = {
...normalizedOptions,
// assert charset per RFC 7159 sec 8.1
isValidCharset: (charset) => charset.slice(0, 4) === 'utf-'
}
return function jsonParser (req, res, next) {
read(req, res, next, parse, debug, readOptions)
}
}
/**
* Create strict violation syntax error matching native error.
*
* @param {string} str
* @param {string} char
* @returns {Error}
* @private
*/
function createStrictSyntaxError (str, char) {
var index = str.indexOf(char)
var partial = ''
if (index !== -1) {
partial = str.substring(0, index) + JSON_SYNTAX_CHAR.repeat(str.length - index)
}
try {
JSON.parse(partial); /* istanbul ignore next */ throw new SyntaxError('strict violation')
} catch (e) {
return normalizeJsonSyntaxError(e, {
message: e.message.replace(JSON_SYNTAX_REGEXP, function (placeholder) {
return str.substring(index, index + placeholder.length)
}),
stack: e.stack
})
}
}
/**
* Get the first non-whitespace character in a string.
*
* @param {string} str
* @returns {string|undefined}
* @private
*/
function firstchar (str) {
var match = FIRST_CHAR_REGEXP.exec(str)
return match
? match[1]
: undefined
}
/**
* Normalize a SyntaxError for JSON.parse.
*
* @param {SyntaxError} error
* @param {Object} obj
* @returns {SyntaxError}
* @private
*/
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]
}
}
// replace stack before message for Node.js 0.10 and below
error.stack = obj.stack.replace(error.message, obj.message)
error.message = obj.message
return error
}