duplex.js

var jsonBody = require('body/json');

/* usage

```js
router.addRoute('/foo/bar',
    bodyParser(function (req, res, opts, cb)))
```

using multiple "middlewares"

```js
router.addRoute('/foo/bar',
    bodyParser(
        getSession(
            myRouteHandler
        )
    )
)
```

using a sugar module

```js
var compose = require('composite');

router.addRoute('/foo/bar', compose(
    getSession,
    bodyParser
)(myRouteHandler))
```

*/
module.exports = bodyParser;

function bodyParser(handler) {
    return function (req, res, opts, cb) {
        jsonBody(req, res, function (err, body) {
            if (err) {
                return cb(err);
            }

            opts.body = body;
            handler(req, res, opts, cb);
        });
    };
}