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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: 2007-2020 Jochen Kupperschmidt |
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:License: MIT, see LICENSE for details. |
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""" |
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from dataclasses import dataclass |
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from http import HTTPStatus |
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from http.server import BaseHTTPRequestHandler, HTTPServer |
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import json |
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import sys |
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from typing import Optional |
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from .config import HttpConfig |
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from .signals import message_received |
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from .util import log, start_thread |
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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 parse_json_message(json_data: str) -> Message: |
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"""Extract message from JSON.""" |
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data = json.loads(json_data) |
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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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class RequestHandler(BaseHTTPRequestHandler): |
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"""Handler for messages submitted via HTTP.""" |
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def do_POST(self) -> None: |
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valid_api_tokens = self.server.api_tokens |
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if valid_api_tokens: |
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api_token = self._get_api_token() |
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if not api_token: |
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self.send_response(HTTPStatus.UNAUTHORIZED) |
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self.end_headers() |
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return |
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if api_token not in valid_api_tokens: |
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self.send_response(HTTPStatus.FORBIDDEN) |
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self.end_headers() |
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return |
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try: |
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content_length = int(self.headers.get('Content-Length', 0)) |
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data = self.rfile.read(content_length).decode('utf-8') |
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message = parse_json_message(data) |
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except (KeyError, ValueError): |
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log(f'Invalid message received from {self.address_string()}.') |
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self.send_error(HTTPStatus.BAD_REQUEST) |
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return |
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self.send_response(HTTPStatus.ACCEPTED) |
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self.end_headers() |
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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_address=self.client_address, |
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) |
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def _get_api_token(self) -> Optional[str]: |
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authorization_value = self.headers.get('authorization') |
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if not authorization_value: |
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return None |
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prefix = 'WTRSGR ' |
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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 version_string(self) -> str: |
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"""Return custom server version string.""" |
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return 'Weitersager' |
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class ReceiveServer(HTTPServer): |
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"""HTTP server that waits for messages.""" |
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def __init__(self, config: HttpConfig) -> None: |
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address = (config.host, config.port) |
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HTTPServer.__init__(self, address, RequestHandler) |
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log('Listening for HTTP requests on {}:{:d}.', *address) |
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self.api_tokens = config.api_tokens |
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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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receiver = ReceiveServer(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 = receiver.__class__.__name__ |
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start_thread(receiver.serve_forever, thread_name) |
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homeworkprod /
weitersager
