python-websocket/websocket.py at master · garrows/python-websocket · GitHub

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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, urlparse, socket, asyncore, threading

urlparse.uses_netloc.append("ws")

urlparse.uses_fragment.append("ws")

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,sync=False):

self._dispatcher.write('\x00' + _utf8(data) + '\xff',sync)

def close(self):

self._dispatcher.handle_close()

@classmethod

def _parse_url(cls, url):

p = urlparse.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 u'/'

if p.query: resource += u'?' + 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):

self.lock = threading.Lock() #threadsafe addon

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 = ''

with self.lock: #threadsafe addon

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_connect (self):

pass

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):

with self.lock: #threadsafe addon

sent = self.send(self._write_buffer)

self._write_buffer = self._write_buffer[sent:]

def writable(self):

with self.lock: #threadsafe addon

return len(self._write_buffer) > 0

def write(self, data,sync=False):

with self.lock: #threadsafe addon

self._write_buffer += data # TODO: separate buffer for handshake from data to

# prevent mix-up when send() is called before

# handshake is complete?

if sync:

self.handle_write()

def _read_until(self, delimiter, callback):

self._read_buffer += self.recv(4096)

pos = self._read_buffer.find(delimiter)

if pos >= 0:

pos += len(delimiter)

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')

python-websocket/websocket.py at master · garrows/python-websocket · GitHub

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