Falcon JSON Translator

json_translator.py

# middlewares/json_translator.py
import json
import falcon

class JSONTranslatorMiddleware(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['doc'] = json.loads(body.decode('utf-8'))

        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'])