1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
|
# SPDX-License-Identifier: AGPL-3.0-or-later
# lint: pylint
# pylint: disable=missing-module-docstring, global-statement
import asyncio
import logging
import random
from ssl import SSLContext
import threading
from typing import Any, Dict
import httpx
from httpx_socks import AsyncProxyTransport
from python_socks import parse_proxy_url, ProxyConnectionError, ProxyTimeoutError, ProxyError
from searx import logger
# Optional uvloop (support Python 3.6)
try:
import uvloop
except ImportError:
pass
else:
uvloop.install()
logger = logger.getChild('searx.network.client')
LOOP = None
SSLCONTEXTS: Dict[Any, SSLContext] = {}
def shuffle_ciphers(ssl_context):
"""Shuffle httpx's default ciphers of a SSL context randomly.
From `What Is TLS Fingerprint and How to Bypass It`_
> When implementing TLS fingerprinting, servers can't operate based on a
> locked-in whitelist database of fingerprints. New fingerprints appear
> when web clients or TLS libraries release new versions. So, they have to
> live off a blocklist database instead.
> ...
> It's safe to leave the first three as is but shuffle the remaining ciphers
> and you can bypass the TLS fingerprint check.
.. _What Is TLS Fingerprint and How to Bypass It:
https://www.zenrows.com/blog/what-is-tls-fingerprint#how-to-bypass-tls-fingerprinting
"""
c_list = httpx._config.DEFAULT_CIPHERS.split(':') # pylint: disable=protected-access
sc_list, c_list = c_list[:3], c_list[3:]
random.shuffle(c_list)
ssl_context.set_ciphers(":".join(sc_list + c_list))
def get_sslcontexts(proxy_url=None, cert=None, verify=True, trust_env=True, http2=False):
key = (proxy_url, cert, verify, trust_env, http2)
if key not in SSLCONTEXTS:
SSLCONTEXTS[key] = httpx.create_ssl_context(cert, verify, trust_env, http2)
shuffle_ciphers(SSLCONTEXTS[key])
return SSLCONTEXTS[key]
class AsyncHTTPTransportNoHttp(httpx.AsyncHTTPTransport):
"""Block HTTP request"""
async def handle_async_request(self, request):
raise httpx.UnsupportedProtocol('HTTP protocol is disabled')
class AsyncProxyTransportFixed(AsyncProxyTransport):
"""Fix httpx_socks.AsyncProxyTransport
Map python_socks exceptions to httpx.ProxyError exceptions
"""
async def handle_async_request(self, request):
try:
return await super().handle_async_request(request)
except ProxyConnectionError as e:
raise httpx.ProxyError("ProxyConnectionError: " + e.strerror, request=request) from e
except ProxyTimeoutError as e:
raise httpx.ProxyError("ProxyTimeoutError: " + e.args[0], request=request) from e
except ProxyError as e:
raise httpx.ProxyError("ProxyError: " + e.args[0], request=request) from e
def get_transport_for_socks_proxy(verify, http2, local_address, proxy_url, limit, retries):
# support socks5h (requests compatibility):
# https://requests.readthedocs.io/en/master/user/advanced/#socks
# socks5:// hostname is resolved on client side
# socks5h:// hostname is resolved on proxy side
rdns = False
socks5h = 'socks5h://'
if proxy_url.startswith(socks5h):
proxy_url = 'socks5://' + proxy_url[len(socks5h) :]
rdns = True
proxy_type, proxy_host, proxy_port, proxy_username, proxy_password = parse_proxy_url(proxy_url)
verify = get_sslcontexts(proxy_url, None, verify, True, http2) if verify is True else verify
return AsyncProxyTransportFixed(
proxy_type=proxy_type,
proxy_host=proxy_host,
proxy_port=proxy_port,
username=proxy_username,
password=proxy_password,
rdns=rdns,
loop=get_loop(),
verify=verify,
http2=http2,
local_address=local_address,
limits=limit,
retries=retries,
)
def get_transport(verify, http2, local_address, proxy_url, limit, retries):
verify = get_sslcontexts(None, None, verify, True, http2) if verify is True else verify
return httpx.AsyncHTTPTransport(
# pylint: disable=protected-access
verify=verify,
http2=http2,
limits=limit,
proxy=httpx._config.Proxy(proxy_url) if proxy_url else None,
local_address=local_address,
retries=retries,
)
def new_client(
# pylint: disable=too-many-arguments
enable_http,
verify,
enable_http2,
max_connections,
max_keepalive_connections,
keepalive_expiry,
proxies,
local_address,
retries,
max_redirects,
hook_log_response,
):
limit = httpx.Limits(
max_connections=max_connections,
max_keepalive_connections=max_keepalive_connections,
keepalive_expiry=keepalive_expiry,
)
# See https://www.python-httpx.org/advanced/#routing
mounts = {}
for pattern, proxy_url in proxies.items():
if not enable_http and pattern.startswith('http://'):
continue
if proxy_url.startswith('socks4://') or proxy_url.startswith('socks5://') or proxy_url.startswith('socks5h://'):
mounts[pattern] = get_transport_for_socks_proxy(
verify, enable_http2, local_address, proxy_url, limit, retries
)
else:
mounts[pattern] = get_transport(verify, enable_http2, local_address, proxy_url, limit, retries)
if not enable_http:
mounts['http://'] = AsyncHTTPTransportNoHttp()
transport = get_transport(verify, enable_http2, local_address, None, limit, retries)
event_hooks = None
if hook_log_response:
event_hooks = {'response': [hook_log_response]}
return httpx.AsyncClient(
transport=transport,
mounts=mounts,
max_redirects=max_redirects,
event_hooks=event_hooks,
)
def get_loop():
return LOOP
def init():
# log
for logger_name in ('hpack.hpack', 'hpack.table', 'httpx._client'):
logging.getLogger(logger_name).setLevel(logging.WARNING)
# loop
def loop_thread():
global LOOP
LOOP = asyncio.new_event_loop()
LOOP.run_forever()
thread = threading.Thread(
target=loop_thread,
name='asyncio_loop',
daemon=True,
)
thread.start()
init()
|
