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read.js 3.80 KiB
/*!
 * body-parser
 * Copyright(c) 2014-2015 Douglas Christopher Wilson
 * MIT Licensed
 */
'use strict'
/**
 * Module dependencies.
 * @private
var createError = require('http-errors')
var getBody = require('raw-body')
var iconv = require('iconv-lite')
var onFinished = require('on-finished')
var zlib = require('zlib')
/**
 * Module exports.
module.exports = read
/**
 * Read a request into a buffer and parse.
 * @param {object} req
 * @param {object} res
 * @param {function} next
 * @param {function} parse
 * @param {function} debug
 * @param {object} options
 * @private
function read (req, res, next, parse, debug, options) {
  var length
  var opts = options
  var stream
  // flag as parsed
  req._body = true
  // read options
  var encoding = opts.encoding !== null
    ? opts.encoding
    : null
  var verify = opts.verify
  try {
    // get the content stream
    stream = contentstream(req, debug, opts.inflate)
    length = stream.length
    stream.length = undefined
  } catch (err) {
    return next(err)
  // set raw-body options
  opts.length = length
  opts.encoding = verify
    ? null
    : encoding
  // assert charset is supported
  if (opts.encoding === null && encoding !== null && !iconv.encodingExists(encoding)) {
    return next(createError(415, 'unsupported charset "' + encoding.toUpperCase() + '"', {
      charset: encoding.toLowerCase(),
type: 'charset.unsupported' })) } // read body debug('read body') getBody(stream, opts, function (error, body) { if (error) { var _error if (error.type === 'encoding.unsupported') { // echo back charset _error = createError(415, 'unsupported charset "' + encoding.toUpperCase() + '"', { charset: encoding.toLowerCase(), type: 'charset.unsupported' }) } else { // set status code on error _error = createError(400, error) } // read off entire request stream.resume() onFinished(req, function onfinished () { next(createError(400, _error)) }) return } // verify if (verify) { try { debug('verify body') verify(req, res, body, encoding) } catch (err) { next(createError(403, err, { body: body, type: err.type || 'entity.verify.failed' })) return } } // parse var str = body try { debug('parse body') str = typeof body !== 'string' && encoding !== null ? iconv.decode(body, encoding) : body req.body = parse(str) } catch (err) { next(createError(400, err, { body: str, type: err.type || 'entity.parse.failed' })) return } next() }) } /** * Get the content stream of the request. * * @param {object} req * @param {function} debug * @param {boolean} [inflate=true] * @return {object}
* @api private */ function contentstream (req, debug, inflate) { var encoding = (req.headers['content-encoding'] || 'identity').toLowerCase() var length = req.headers['content-length'] var stream debug('content-encoding "%s"', encoding) if (inflate === false && encoding !== 'identity') { throw createError(415, 'content encoding unsupported', { encoding: encoding, type: 'encoding.unsupported' }) } switch (encoding) { case 'deflate': stream = zlib.createInflate() debug('inflate body') req.pipe(stream) break case 'gzip': stream = zlib.createGunzip() debug('gunzip body') req.pipe(stream) break case 'identity': stream = req stream.length = length break default: throw createError(415, 'unsupported content encoding "' + encoding + '"', { encoding: encoding, type: 'encoding.unsupported' }) } return stream }