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""" |
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weitersager.http |
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~~~~~~~~~~~~~~~~ |
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HTTP server to receive messages |
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:Copyright: 2007-2022 Jochen Kupperschmidt |
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:License: MIT, see LICENSE for details. |
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""" |
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from __future__ import annotations |
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from dataclasses import dataclass |
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from http import HTTPStatus |
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import logging |
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import sys |
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from typing import Optional |
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from wsgiref.simple_server import make_server, ServerHandler, WSGIServer |
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from werkzeug.exceptions import abort, HTTPException |
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from werkzeug.routing import Map, Rule |
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from werkzeug.wrappers import Request, Response |
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from .config import HttpConfig |
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from .signals import message_received |
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from .util import start_thread |
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logger = logging.getLogger(__name__) |
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@dataclass(frozen=True) |
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class Message: |
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channel: str |
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text: str |
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def create_app(api_tokens: set[str]): |
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return Application(api_tokens) |
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class Application: |
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def __init__(self, api_tokens: set[str]): |
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self._api_tokens = api_tokens |
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self._url_map = Map( |
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[ |
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Rule('/', endpoint='root'), |
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] |
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) |
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def __call__(self, environ, start_response): |
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return self.wsgi_app(environ, start_response) |
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@Request.application |
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def wsgi_app(self, request): |
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adapter = self._url_map.bind_to_environ(request.environ) |
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try: |
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endpoint, values = adapter.match() |
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handler = getattr(self, f'on_{endpoint}') |
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return handler(request, **values) |
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except HTTPException as exc: |
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return exc |
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def on_root(self, request): |
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if self._api_tokens: |
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api_token = _get_api_token(request.headers) |
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if not api_token: |
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abort(HTTPStatus.UNAUTHORIZED) |
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if api_token not in self._api_tokens: |
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abort(HTTPStatus.FORBIDDEN) |
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if not request.is_json: |
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abort(HTTPStatus.UNSUPPORTED_MEDIA_TYPE) |
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try: |
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message = _parse_json_message(request.json) |
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except (KeyError, ValueError): |
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logger.info( |
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'Invalid message received from %s.', request.remote_addr |
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) |
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abort(HTTPStatus.BAD_REQUEST) |
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message_received.send( |
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channel_name=message.channel, |
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text=message.text, |
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source_ip_address=request.remote_addr, |
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) |
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return Response('', status=HTTPStatus.ACCEPTED) |
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def _get_api_token(headers) -> Optional[str]: |
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authorization_value = headers.get('Authorization') |
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if not authorization_value: |
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return None |
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prefix = 'Token ' |
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if not authorization_value.startswith(prefix): |
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return None |
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return authorization_value[len(prefix) :] |
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def _parse_json_message(data: dict[str, str]) -> Message: |
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"""Extract message from JSON.""" |
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channel = data['channel'] |
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text = data['text'] |
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return Message(channel=channel, text=text) |
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# Override value of `Server:` header sent by wsgiref. |
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ServerHandler.server_software = 'Weitersager' |
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def create_server(config: HttpConfig) -> WSGIServer: |
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"""Create the HTTP server.""" |
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app = create_app(config.api_tokens) |
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return make_server(config.host, config.port, app) |
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def start_receive_server(config: HttpConfig) -> None: |
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"""Start in a separate thread.""" |
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try: |
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server = create_server(config) |
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except OSError as e: |
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sys.stderr.write(f'Error {e.errno:d}: {e.strerror}\n') |
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sys.stderr.write( |
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f'Probably no permission to open port {config.port}. ' |
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'Try to specify a port number above 1,024 (or even ' |
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'4,096) and up to 65,535.\n' |
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) |
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sys.exit(1) |
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thread_name = server.__class__.__name__ |
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start_thread(server.serve_forever, thread_name) |
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logger.info('Listening for HTTP requests on %s:%d.', *server.server_address) |
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homeworkprod /
weitersager
