|
1
|
|
|
""" |
|
2
|
|
|
weitersager.http |
|
3
|
|
|
~~~~~~~~~~~~~~~~ |
|
4
|
|
|
|
|
5
|
|
|
HTTP server to receive messages |
|
6
|
|
|
|
|
7
|
|
|
:Copyright: 2007-2021 Jochen Kupperschmidt |
|
8
|
|
|
:License: MIT, see LICENSE for details. |
|
9
|
|
|
""" |
|
10
|
|
|
|
|
11
|
1 |
|
from dataclasses import dataclass |
|
12
|
1 |
|
from functools import partial |
|
13
|
1 |
|
from http import HTTPStatus |
|
14
|
1 |
|
from http.server import BaseHTTPRequestHandler, HTTPServer |
|
15
|
1 |
|
import json |
|
16
|
1 |
|
import sys |
|
17
|
1 |
|
from typing import Optional, Set |
|
18
|
|
|
|
|
19
|
1 |
|
from .config import HttpConfig |
|
20
|
1 |
|
from .signals import message_received |
|
21
|
1 |
|
from .util import log, start_thread |
|
22
|
|
|
|
|
23
|
|
|
|
|
24
|
1 |
|
@dataclass(frozen=True) |
|
25
|
|
|
class Message: |
|
26
|
1 |
|
channel: str |
|
27
|
1 |
|
text: str |
|
28
|
|
|
|
|
29
|
|
|
|
|
30
|
1 |
|
def parse_json_message(json_data: str) -> Message: |
|
31
|
|
|
"""Extract message from JSON.""" |
|
32
|
1 |
|
data = json.loads(json_data) |
|
33
|
|
|
|
|
34
|
1 |
|
channel = data['channel'] |
|
35
|
1 |
|
text = data['text'] |
|
36
|
|
|
|
|
37
|
1 |
|
return Message(channel=channel, text=text) |
|
38
|
|
|
|
|
39
|
|
|
|
|
40
|
1 |
|
class RequestHandler(BaseHTTPRequestHandler): |
|
41
|
|
|
"""Handler for messages submitted via HTTP.""" |
|
42
|
|
|
|
|
43
|
1 |
|
def __init__(self, api_tokens: Set[str], *args, **kwargs) -> None: |
|
44
|
1 |
|
self.api_tokens = api_tokens |
|
45
|
1 |
|
super().__init__(*args, **kwargs) |
|
46
|
|
|
|
|
47
|
1 |
|
def do_POST(self) -> None: |
|
48
|
1 |
|
if self.api_tokens: |
|
49
|
1 |
|
api_token = self._get_api_token() |
|
50
|
1 |
|
if not api_token: |
|
51
|
1 |
|
self.send_response(HTTPStatus.UNAUTHORIZED) |
|
52
|
1 |
|
self.end_headers() |
|
53
|
1 |
|
return |
|
54
|
|
|
|
|
55
|
1 |
|
if api_token not in self.api_tokens: |
|
56
|
1 |
|
self.send_response(HTTPStatus.FORBIDDEN) |
|
57
|
1 |
|
self.end_headers() |
|
58
|
1 |
|
return |
|
59
|
|
|
|
|
60
|
1 |
|
try: |
|
61
|
1 |
|
content_length = int(self.headers.get('Content-Length', 0)) |
|
62
|
1 |
|
data = self.rfile.read(content_length).decode('utf-8') |
|
63
|
1 |
|
message = parse_json_message(data) |
|
64
|
1 |
|
except (KeyError, ValueError): |
|
65
|
1 |
|
log(f'Invalid message received from {self.address_string()}.') |
|
66
|
1 |
|
self.send_error(HTTPStatus.BAD_REQUEST) |
|
67
|
1 |
|
return |
|
68
|
|
|
|
|
69
|
1 |
|
self.send_response(HTTPStatus.ACCEPTED) |
|
70
|
1 |
|
self.end_headers() |
|
71
|
|
|
|
|
72
|
1 |
|
message_received.send( |
|
73
|
|
|
channel_name=message.channel, |
|
74
|
|
|
text=message.text, |
|
75
|
|
|
source_address=self.client_address, |
|
76
|
|
|
) |
|
77
|
|
|
|
|
78
|
1 |
|
def _get_api_token(self) -> Optional[str]: |
|
79
|
1 |
|
authorization_value = self.headers.get('Authorization') |
|
80
|
1 |
|
if not authorization_value: |
|
81
|
1 |
|
return None |
|
82
|
|
|
|
|
83
|
1 |
|
prefix = 'Token ' |
|
84
|
1 |
|
if not authorization_value.startswith(prefix): |
|
85
|
|
|
return None |
|
86
|
|
|
|
|
87
|
1 |
|
return authorization_value[len(prefix) :] |
|
88
|
|
|
|
|
89
|
1 |
|
def version_string(self) -> str: |
|
90
|
|
|
"""Return custom server version string.""" |
|
91
|
1 |
|
return 'Weitersager' |
|
92
|
|
|
|
|
93
|
|
|
|
|
94
|
1 |
|
def create_server(config: HttpConfig) -> HTTPServer: |
|
95
|
|
|
"""Create the HTTP server.""" |
|
96
|
1 |
|
address = (config.host, config.port) |
|
97
|
1 |
|
handler_class = partial(RequestHandler, config.api_tokens) |
|
98
|
1 |
|
return HTTPServer(address, handler_class) |
|
99
|
|
|
|
|
100
|
|
|
|
|
101
|
1 |
|
def start_receive_server(config: HttpConfig) -> None: |
|
102
|
|
|
"""Start in a separate thread.""" |
|
103
|
|
|
try: |
|
104
|
|
|
server = create_server(config) |
|
105
|
|
|
except OSError as e: |
|
106
|
|
|
sys.stderr.write(f'Error {e.errno:d}: {e.strerror}\n') |
|
107
|
|
|
sys.stderr.write( |
|
108
|
|
|
f'Probably no permission to open port {config.port}. ' |
|
109
|
|
|
'Try to specify a port number above 1,024 (or even ' |
|
110
|
|
|
'4,096) and up to 65,535.\n' |
|
111
|
|
|
) |
|
112
|
|
|
sys.exit(1) |
|
113
|
|
|
|
|
114
|
|
|
thread_name = server.__class__.__name__ |
|
115
|
|
|
start_thread(server.serve_forever, thread_name) |
|
116
|
|
|
log('Listening for HTTP requests on {}:{:d}.', *server.server_address) |
|
117
|
|
|
|
homeworkprod /
weitersager
