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Python 3.1 version of python-websocket
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""" | |
This program is free software: you can redistribute it and/or modify | |
it under the terms of the GNU General Public License as published by | |
the Free Software Foundation, either version 3 of the License, or | |
(at your option) any later version. | |
This program 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 General Public License for more details. | |
You should have received a copy of the GNU General Public License | |
along with this program. If not, see <http://www.gnu.org/licenses/> | |
""" | |
import sys, re, socket, asyncore | |
from urllib.parse import urlparse | |
class WebSocket(object): | |
def __init__(self, url, **kwargs): | |
self.host, self.port, self.resource, self.secure = WebSocket._parse_url(url) | |
self.protocol = kwargs.pop('protocol', None) | |
self.cookie_jar = kwargs.pop('cookie_jar', None) | |
self.onopen = kwargs.pop('onopen', None) | |
self.onmessage = kwargs.pop('onmessage', None) | |
self.onerror = kwargs.pop('onerror', None) | |
self.onclose = kwargs.pop('onclose', None) | |
if kwargs: raise ValueError('Unexpected argument(s): %s' % ', '.join(kwargs.values())) | |
self._dispatcher = _Dispatcher(self) | |
def send(self, data): | |
self._dispatcher.write('\x00' + _utf8(data) + '\xff') | |
def close(self): | |
self._dispatcher.handle_close() | |
@classmethod | |
def _parse_url(cls, url): | |
p = urlparse(url) | |
if p.hostname: | |
host = p.hostname | |
else: | |
raise ValueError('URL must be absolute') | |
if p.fragment: | |
raise ValueError('URL must not contain a fragment component') | |
if p.scheme == 'ws': | |
secure = False | |
port = p.port or 80 | |
elif p.scheme == 'wss': | |
raise NotImplementedError('Secure WebSocket not yet supported') | |
# secure = True | |
# port = p.port or 443 | |
else: | |
raise ValueError('Invalid URL scheme') | |
resource = p.path or "/" | |
if p.query: resource += "?" + p.query | |
return (host, port, resource, secure) | |
#@classmethod | |
#def _generate_key(cls): | |
# spaces = random.randint(1, 12) | |
# number = random.randint(0, 0xffffffff/spaces) | |
# key = list(str(number*spaces)) | |
# chars = map(unichr, range(0x21, 0x2f) + range(0x3a, 0x7e)) | |
# random_inserts = random.sample(xrange(len(key)), random.randint(1,12)) | |
# for (i, c) in [(r, random.choice(chars)) for r in random_inserts]: | |
# key.insert(i, c) | |
# print key | |
# return ''.join(key) | |
class WebSocketError(Exception): | |
def _init_(self, value): | |
self.value = value | |
def _str_(self): | |
return str(self.value) | |
class _Dispatcher(asyncore.dispatcher): | |
def __init__(self, ws): | |
asyncore.dispatcher.__init__(self) | |
self.create_socket(socket.AF_INET, socket.SOCK_STREAM) | |
self.connect((ws.host, ws.port)) | |
self.ws = ws | |
self._read_buffer = '' | |
self._write_buffer = '' | |
self._handshake_complete = False | |
if self.ws.port != 80: | |
hostport = '%s:%d' % (self.ws.host, self.ws.port) | |
else: | |
hostport = self.ws.host | |
fields = [ | |
'Upgrade: WebSocket', | |
'Connection: Upgrade', | |
'Host: ' + hostport, | |
'Origin: http://' + hostport, | |
#'Sec-WebSocket-Key1: %s' % WebSocket.generate_key(), | |
#'Sec-WebSocket-Key2: %s' % WebSocket.generate_key() | |
] | |
if self.ws.protocol: fields['Sec-WebSocket-Protocol'] = self.ws.protocol | |
if self.ws.cookie_jar: | |
cookies = filter(lambda c: _cookie_for_domain(c, _eff_host(self.ws.host)) and \ | |
_cookie_for_path(c, self.ws.resource) and \ | |
not c.is_expired(), self.ws.cookie_jar) | |
for cookie in cookies: | |
fields.append('Cookie: %s=%s' % (cookie.name, cookie.value)) | |
# key3 = ''.join(map(unichr, (random.randrange(256) for i in xrange(8)))) | |
self.write(_utf8('GET %s HTTP/1.1\r\n' \ | |
'%s\r\n\r\n' % (self.ws.resource, | |
'\r\n'.join(fields)))) | |
# key3))) | |
def handl_expt(self): | |
self.handle_error() | |
def handle_error(self): | |
self.close() | |
t, e, trace = sys.exc_info() | |
if self.ws.onerror: | |
self.ws.onerror(e) | |
else: | |
asyncore.dispatcher.handle_error(self) | |
def handle_close(self): | |
self.close() | |
if self.ws.onclose: | |
self.ws.onclose() | |
def handle_read(self): | |
if self._handshake_complete: | |
self._read_until('\xff', self._handle_frame) | |
else: | |
self._read_until('\r\n\r\n', self._handle_header) | |
def handle_write(self): | |
sent = self.send(self._write_buffer) | |
self._write_buffer = self._write_buffer[sent:] | |
def writable(self): | |
return len(self._write_buffer) > 0 | |
def write(self, data): | |
self._write_buffer += data.decode('utf8') # TODO: separate buffer for handshake from data to | |
# prevent mix-up when send() is called before | |
# handshake is complete? | |
def _read_until(self, delimiter, callback): | |
self._read_buffer += self.recv(4096) | |
pos = self._read_buffer.find(delimiter)+len(delimiter)+1 | |
if pos > 0: | |
data = self._read_buffer[:pos] | |
self._read_buffer = self._read_buffer[pos:] | |
if data: | |
callback(data) | |
def _handle_frame(self, frame): | |
assert frame[-1] == '\xff' | |
if frame[0] != '\x00': | |
raise WebSocketError('WebSocket stream error') | |
if self.ws.onmessage: | |
self.ws.onmessage(frame[1:-1]) | |
# TODO: else raise WebSocketError('No message handler defined') | |
def _handle_header(self, header): | |
assert header[-4:] == '\r\n\r\n' | |
start_line, fields = _parse_http_header(header) | |
if start_line != 'HTTP/1.1 101 Web Socket Protocol Handshake' or \ | |
fields.get('Connection', None) != 'Upgrade' or \ | |
fields.get('Upgrade', None) != 'WebSocket': | |
raise WebSocketError('Invalid server handshake') | |
self._handshake_complete = True | |
if self.ws.onopen: | |
self.ws.onopen() | |
_IPV4_RE = re.compile(r'\.\d+$') | |
_PATH_SEP = re.compile(r'/+') | |
def _parse_http_header(header): | |
def split_field(field): | |
k, v = field.split(':', 1) | |
return (k, v.strip()) | |
lines = header.strip().split('\r\n') | |
if len(lines) > 0: | |
start_line = lines[0] | |
else: | |
start_line = None | |
return (start_line, dict(map(split_field, lines[1:]))) | |
def _eff_host(host): | |
if host.find('.') == -1 and not _IPV4_RE.search(host): | |
return host + '.local' | |
return host | |
def _cookie_for_path(cookie, path): | |
if not cookie.path or path == '' or path == '/': | |
return True | |
path = _PATH_SEP.split(path)[1:] | |
cookie_path = _PATH_SEP.split(cookie.path)[1:] | |
for p1, p2 in map(lambda *ps: ps, path, cookie_path): | |
if p1 == None: | |
return True | |
elif p1 != p2: | |
return False | |
return True | |
def _cookie_for_domain(cookie, domain): | |
if not cookie.domain: | |
return True | |
elif cookie.domain[0] == '.': | |
return domain.endswith(cookie.domain) | |
else: | |
return cookie.domain == domain | |
def _utf8(s): | |
return s.encode('utf-8') |
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