109 lines
2.2 KiB
JavaScript
109 lines
2.2 KiB
JavaScript
/*!
|
|
* body-parser
|
|
* Copyright(c) 2014 Jonathan Ong
|
|
* Copyright(c) 2014 Douglas Christopher Wilson
|
|
* MIT Licensed
|
|
*/
|
|
|
|
/**
|
|
* Module dependencies.
|
|
*/
|
|
|
|
var bytes = require('bytes')
|
|
var read = require('../read')
|
|
var typer = require('media-typer')
|
|
var typeis = require('type-is')
|
|
|
|
/**
|
|
* Module exports.
|
|
*/
|
|
|
|
module.exports = json
|
|
|
|
/**
|
|
* RegExp to match the first non-space in a string.
|
|
*/
|
|
|
|
var firstcharRegExp = /^\s*(.)/
|
|
|
|
/**
|
|
* 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')
|
|
}
|
|
|
|
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 !== '[') {
|
|
throw new Error('invalid json')
|
|
}
|
|
}
|
|
|
|
return JSON.parse(body, reviver)
|
|
}
|
|
|
|
return function jsonParser(req, res, next) {
|
|
if (req._body) return next()
|
|
req.body = req.body || {}
|
|
|
|
if (!typeis(req, type)) return next()
|
|
|
|
// RFC 7159 sec 8.1
|
|
var charset = typer.parse(req).parameters.charset || 'utf-8'
|
|
if (charset.substr(0, 4).toLowerCase() !== 'utf-') {
|
|
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 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] : ''
|
|
}
|