Application

Everything in nanohttp start from an application. You should define your root controller in application. for more information and samples see WSGI.

Life cycle

Hooks

Hooks is part of your application life-cycle and calling when they are need.

A few hooks are available:

• app_init: After application initialized.

• begin_request: Before start to processing request.

• begin_response: After processing request and preparing the response.

• end_response: Response is ready to send to client.

from nanohttp import Application, Controller, context

class JwtApplication(Application):
    token_key = 'HTTP_AUTHORIZATION'
    refresh_token_cookie_key = 'refresh-token'

    def begin_request(self):
        if self.token_key in context.environ:
            encoded_token = context.environ[self.token_key]
            try:
                context.identity = JwtPrincipal.decode(encoded_token)
            except itsdangerous.SignatureExpired as ex:
                refresh_token_encoded = context.cookies.get(self.refresh_token_cookie_key)
                if refresh_token_encoded:
                    # Extracting session_id
                    session_id = ex.payload.get('sessionId')
                    if session_id:
                        context.identity = new_token = self.refresh_jwt_token(refresh_token_encoded, session_id)
                        if new_token:
                            context.response_headers.add_header('X-New-JWT-Token', new_token.encode().decode())

            except itsdangerous.BadData:
                pass

        if not hasattr(context, 'identity'):
            context.identity = None

Note

[Pro-tip] in some cases, you can override Application._handle_exception to handle exception for all requests.