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Viewing file:     json.js (1.44 KB)      -rw-r--r--

'use strict';

/**
 * Module dependencies.
 */

const raw = require('raw-body');
const inflate = require('inflation');
const utils = require('./utils');

// Allowed whitespace is defined in RFC 7159
// http://www.rfc-editor.org/rfc/rfc7159.txt
const strictJSONReg = /^[\x20\x09\x0a\x0d]*(\[|\{)/;

/**
 * Return a Promise which parses json requests.
 *
 * Pass a node request or an object with `.req`,
 * such as a koa Context.
 *
 * @param {Request} req
 * @param {Options} [opts]
 * @return {Function}
 * @api public
 */

module.exports = async function(req, opts) {
  req = req.req || req;
  opts = utils.clone(opts);

  // defaults
  const len = req.headers['content-length'];
  const encoding = req.headers['content-encoding'] || 'identity';
  if (len && encoding === 'identity') opts.length = ~~len;
  opts.encoding = opts.encoding || 'utf8';
  opts.limit = opts.limit || '1mb';
  const strict = opts.strict !== false;

  const str = await raw(inflate(req), opts);
  try {
    const parsed = parse(str);
    return opts.returnRawBody ? { parsed, raw: str } : parsed;
  } catch (err) {
    err.status = 400;
    err.body = str;
    throw err;
  }

  function parse(str) {
    if (!strict) return str ? JSON.parse(str) : str;
    // strict mode always return object
    if (!str) return {};
    // strict JSON test
    if (!strictJSONReg.test(str)) {
      throw new SyntaxError('invalid JSON, only supports object and array');
    }
    return JSON.parse(str);
  }
};