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__( |
44
|
|
|
self, *args, api_tokens: Optional[Set[str]] = None, **kwargs |
45
|
|
|
) -> None: |
46
|
1 |
|
if api_tokens is None: |
47
|
|
|
api_tokens = set() |
48
|
1 |
|
self.api_tokens = api_tokens |
49
|
|
|
|
50
|
1 |
|
super().__init__(*args, **kwargs) |
51
|
|
|
|
52
|
1 |
|
def do_POST(self) -> None: |
53
|
1 |
|
valid_api_tokens = self.api_tokens |
54
|
1 |
|
if valid_api_tokens: |
55
|
1 |
|
api_token = self._get_api_token() |
56
|
1 |
|
if not api_token: |
57
|
1 |
|
self.send_response(HTTPStatus.UNAUTHORIZED) |
58
|
1 |
|
self.end_headers() |
59
|
1 |
|
return |
60
|
|
|
|
61
|
1 |
|
if api_token not in valid_api_tokens: |
62
|
1 |
|
self.send_response(HTTPStatus.FORBIDDEN) |
63
|
1 |
|
self.end_headers() |
64
|
1 |
|
return |
65
|
|
|
|
66
|
1 |
|
try: |
67
|
1 |
|
content_length = int(self.headers.get('Content-Length', 0)) |
68
|
1 |
|
data = self.rfile.read(content_length).decode('utf-8') |
69
|
1 |
|
message = parse_json_message(data) |
70
|
1 |
|
except (KeyError, ValueError): |
71
|
1 |
|
log(f'Invalid message received from {self.address_string()}.') |
72
|
1 |
|
self.send_error(HTTPStatus.BAD_REQUEST) |
73
|
1 |
|
return |
74
|
|
|
|
75
|
1 |
|
self.send_response(HTTPStatus.ACCEPTED) |
76
|
1 |
|
self.end_headers() |
77
|
|
|
|
78
|
1 |
|
message_received.send( |
79
|
|
|
channel_name=message.channel, |
80
|
|
|
text=message.text, |
81
|
|
|
source_address=self.client_address, |
82
|
|
|
) |
83
|
|
|
|
84
|
1 |
|
def _get_api_token(self) -> Optional[str]: |
85
|
1 |
|
authorization_value = self.headers.get('Authorization') |
86
|
1 |
|
if not authorization_value: |
87
|
1 |
|
return None |
88
|
|
|
|
89
|
1 |
|
prefix = 'Token ' |
90
|
1 |
|
if not authorization_value.startswith(prefix): |
91
|
|
|
return None |
92
|
|
|
|
93
|
1 |
|
return authorization_value[len(prefix) :] |
94
|
|
|
|
95
|
1 |
|
def version_string(self) -> str: |
96
|
|
|
"""Return custom server version string.""" |
97
|
1 |
|
return 'Weitersager' |
98
|
|
|
|
99
|
|
|
|
100
|
1 |
|
def create_server(config: HttpConfig) -> HTTPServer: |
101
|
|
|
"""Create the HTTP server.""" |
102
|
1 |
|
address = (config.host, config.port) |
103
|
1 |
|
handler_class = partial(RequestHandler, api_tokens=config.api_tokens) |
104
|
1 |
|
return HTTPServer(address, handler_class) |
105
|
|
|
|
106
|
|
|
|
107
|
1 |
|
def start_receive_server(config: HttpConfig) -> None: |
108
|
|
|
"""Start in a separate thread.""" |
109
|
|
|
try: |
110
|
|
|
server = create_server(config) |
111
|
|
|
except OSError as e: |
112
|
|
|
sys.stderr.write(f'Error {e.errno:d}: {e.strerror}\n') |
113
|
|
|
sys.stderr.write( |
114
|
|
|
f'Probably no permission to open port {config.port}. ' |
115
|
|
|
'Try to specify a port number above 1,024 (or even ' |
116
|
|
|
'4,096) and up to 65,535.\n' |
117
|
|
|
) |
118
|
|
|
sys.exit(1) |
119
|
|
|
|
120
|
|
|
thread_name = server.__class__.__name__ |
121
|
|
|
start_thread(server.serve_forever, thread_name) |
122
|
|
|
log('Listening for HTTP requests on {}:{:d}.', *server.server_address) |
123
|
|
|
|