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- /*!
- * 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] : ''
- }
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