middleware.py

import falcon
import json


class JSONTranslator(object):
    def process_request(self, req, resp):
        if req.content_length in (None, 0):
            return

        body = req.stream.read()
        if not body:
            raise falcon.HTTPBadRequest('Empty request body',
                                        'A valid JSON document is required.')

        try:
            req.context = json.loads(body.decode('utf-8'))
            print req.context

        except (ValueError, UnicodeDecodeError):
            raise falcon.HTTPError(falcon.HTTP_753,
                                   'Malformed JSON',
                                   'Could not decode the request body. The '
                                   'JSON was incorrect or not encoded as '
                                   'UTF-8.')

    def process_response(self, req, resp, resource):
        if 'result' not in req.context:
            return

        resp.body = json.dumps(req.context['result'])

class SetHeaders(object):
    def process_request(self, req, resp):
        resp.set_header('Access-Control-Allow-Origin', '*')
        resp.status = falcon.HTTP_200