|
/**
|
* Module dependencies.
|
*/
|
|
var raw = require('raw-body');
|
var inflate = require('inflation');
|
var utils = require('./utils');
|
|
// Allowed whitespace is defined in RFC 7159
|
// http://www.rfc-editor.org/rfc/rfc7159.txt
|
var 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 = function(req, opts){
|
req = req.req || req;
|
opts = utils.clone(opts);
|
|
// defaults
|
var len = req.headers['content-length'];
|
var encoding = req.headers['content-encoding'] || 'identity';
|
if (len && encoding === 'identity') opts.length = len = ~~len;
|
opts.encoding = opts.encoding || 'utf8';
|
opts.limit = opts.limit || '1mb';
|
var strict = opts.strict !== false;
|
|
// raw-body returns a promise when no callback is specified
|
return Promise.resolve()
|
.then(function() {
|
return raw(inflate(req), opts);
|
})
|
.then(function(str) {
|
try {
|
var parsed = parse(str);
|
return opts.returnRawBody ? { parsed: 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 Error('invalid JSON, only supports object and array');
|
}
|
return JSON.parse(str);
|
}
|
};
|
