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_http.py
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_http.py
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"""
websocket - WebSocket client library for Python
Copyright (C) 2010 Hiroki Ohtani(liris)
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1335 USA
"""
import six
import socket
import errno
import os
import sys
if six.PY3:
from base64 import encodebytes as base64encode
else:
from base64 import encodestring as base64encode
from ._logging import *
from ._url import *
from ._socket import*
from ._exceptions import *
from ._ssl_compat import *
__all__ = ["proxy_info", "connect", "read_headers"]
class proxy_info(object):
def __init__(self, **options):
self.host = options.get("http_proxy_host", None)
if self.host:
self.port = options.get("http_proxy_port", 0)
self.auth = options.get("http_proxy_auth", None)
self.no_proxy = options.get("http_no_proxy", None)
else:
self.port = 0
self.auth = None
self.no_proxy = None
def connect(url, options, proxy, socket):
hostname, port, resource, is_secure = parse_url(url)
if socket:
return socket, (hostname, port, resource)
addrinfo_list, need_tunnel, auth = _get_addrinfo_list(hostname, port, is_secure, proxy)
if not addrinfo_list:
raise WebSocketException(
"Host not found.: " + hostname + ":" + str(port))
sock = None
try:
sock = _open_socket(addrinfo_list, options.sockopt, options.timeout)
if need_tunnel:
sock = _tunnel(sock, hostname, port, auth)
if is_secure:
if HAVE_SSL:
sock = _ssl_socket(sock, options.sslopt, hostname)
else:
raise WebSocketException("SSL not available.")
return sock, (hostname, port, resource)
except:
if sock:
sock.close()
raise
def _get_addrinfo_list(hostname, port, is_secure, proxy):
phost, pport, pauth = get_proxy_info(hostname, is_secure,
proxy.host, proxy.port, proxy.auth, proxy.no_proxy)
if not phost:
addrinfo_list = socket.getaddrinfo(hostname, port, 0, 0, socket.SOL_TCP)
return addrinfo_list, False, None
else:
pport = pport and pport or 80
addrinfo_list = socket.getaddrinfo(phost, pport, 0, 0, socket.SOL_TCP)
return addrinfo_list, True, pauth
def _open_socket(addrinfo_list, sockopt, timeout):
err = None
for addrinfo in addrinfo_list:
family = addrinfo[0]
sock = socket.socket(family)
sock.settimeout(timeout)
for opts in DEFAULT_SOCKET_OPTION:
sock.setsockopt(*opts)
for opts in sockopt:
sock.setsockopt(*opts)
address = addrinfo[4]
try:
sock.connect(address)
except socket.error as error:
error.remote_ip = str(address[0])
if error.errno in (errno.ECONNREFUSED, ):
err = error
continue
else:
raise
else:
break
else:
raise err
return sock
def _can_use_sni():
return six.PY2 and sys.version_info >= (2, 7, 9) or sys.version_info >= (3, 2)
def _wrap_sni_socket(sock, sslopt, hostname, check_hostname):
context = ssl.SSLContext(sslopt.get('ssl_version', ssl.PROTOCOL_SSLv23))
if sslopt.get('cert_reqs', ssl.CERT_NONE) != ssl.CERT_NONE:
context.load_verify_locations(cafile=sslopt.get('ca_certs', None))
if sslopt.get('certfile', None):
context.load_cert_chain(
sslopt['certfile'],
sslopt.get('keyfile', None),
sslopt.get('password', None),
)
# see https://github.com/liris/websocket-client/commit/b96a2e8fa765753e82eea531adb19716b52ca3ca#commitcomment-10803153
context.verify_mode = sslopt['cert_reqs']
if HAVE_CONTEXT_CHECK_HOSTNAME:
context.check_hostname = check_hostname
if 'ciphers' in sslopt:
context.set_ciphers(sslopt['ciphers'])
if 'cert_chain' in sslopt :
certfile,keyfile,password = sslopt['cert_chain']
context.load_cert_chain(certfile, keyfile, password)
return context.wrap_socket(
sock,
do_handshake_on_connect=sslopt.get('do_handshake_on_connect', True),
suppress_ragged_eofs=sslopt.get('suppress_ragged_eofs', True),
server_hostname=hostname,
)
def _ssl_socket(sock, user_sslopt, hostname):
sslopt = dict(cert_reqs=ssl.CERT_REQUIRED)
sslopt.update(user_sslopt)
certPath = os.path.join(
os.path.dirname(__file__), "cacert.pem")
if os.path.isfile(certPath) and user_sslopt.get('ca_certs', None) == None:
sslopt['ca_certs'] = certPath
check_hostname = sslopt["cert_reqs"] != ssl.CERT_NONE and sslopt.pop('check_hostname', True)
if _can_use_sni():
sock = _wrap_sni_socket(sock, sslopt, hostname, check_hostname)
else:
sslopt.pop('check_hostname', True)
sock = ssl.wrap_socket(sock, **sslopt)
if not HAVE_CONTEXT_CHECK_HOSTNAME and check_hostname:
match_hostname(sock.getpeercert(), hostname)
return sock
def _tunnel(sock, host, port, auth):
debug("Connecting proxy...")
connect_header = "CONNECT %s:%d HTTP/1.0\r\n" % (host, port)
# TODO: support digest auth.
if auth and auth[0]:
auth_str = auth[0]
if auth[1]:
auth_str += ":" + auth[1]
encoded_str = base64encode(auth_str.encode()).strip().decode()
connect_header += "Proxy-Authorization: Basic %s\r\n" % encoded_str
connect_header += "\r\n"
dump("request header", connect_header)
send(sock, connect_header)
try:
status, resp_headers = read_headers(sock)
except Exception as e:
raise WebSocketProxyException(str(e))
if status != 200:
raise WebSocketProxyException(
"failed CONNECT via proxy status: %r" % status)
return sock
def read_headers(sock):
status = None
headers = {}
trace("--- response header ---")
while True:
line = recv_line(sock)
line = line.decode('utf-8').strip()
if not line:
break
trace(line)
if not status:
status_info = line.split(" ", 2)
status = int(status_info[1])
else:
kv = line.split(":", 1)
if len(kv) == 2:
key, value = kv
headers[key.lower()] = value.strip().lower()
else:
raise WebSocketException("Invalid header")
trace("-----------------------")
return status, headers

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