/usr/lib/python2.7/dist-packages/terminado/websocket.py is in python-terminado 0.5-1.
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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 | """Tornado websocket handler to serve a terminal interface.
"""
#
# BSD License
#
# Copyright (c) 2014, Ramalingam Saravanan <sarava@sarava.net>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice, this
# list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
# and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
# ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
from __future__ import absolute_import, print_function
# Python3-friendly imports
try:
from urllib.parse import urlparse
except ImportError:
from urlparse import urlparse
import json
import logging
import tornado.web
import tornado.websocket
def _cast_unicode(s):
if isinstance(s, bytes):
return s.decode('utf-8')
return s
class TermSocket(tornado.websocket.WebSocketHandler):
"""Handler for a terminal websocket"""
def initialize(self, term_manager):
self.term_manager = term_manager
self.term_name = ""
self.size = (None, None)
self.terminal = None
self._log = logging.getLogger(__name__)
def origin_check(self):
"""Reject connections from other origin pages.
This is superfluous with Tornado >= 4, as the same check was added to
Tornado itself. For now, we keep this around for older versions of
Tornado.
"""
if "Origin" in self.request.headers:
origin = self.request.headers.get("Origin")
else:
origin = self.request.headers.get("Sec-Websocket-Origin", None)
if not origin:
return False
host = self.request.headers.get("Host").lower()
ws_host = urlparse(origin).netloc.lower()
if host == ws_host:
return True
else:
self._log.error("pyxterm.origin_check: ERROR %s != %s", host, ws_host)
return False
def open(self, url_component=None):
"""Websocket connection opened.
Call our terminal manager to get a terminal, and connect to it as a
client.
"""
if not self.origin_check():
raise tornado.web.HTTPError(404, "Websocket origin mismatch")
self._log.info("TermSocket.open: %s", url_component)
url_component = _cast_unicode(url_component)
self.term_name = url_component or 'tty'
self.terminal = self.term_manager.get_terminal(url_component)
for s in self.terminal.read_buffer:
self.on_pty_read(s)
self.terminal.clients.append(self)
self.send_json_message(["setup", {}])
self._log.info("TermSocket.open: Opened %s", self.term_name)
def on_pty_read(self, text):
"""Data read from pty; send to frontend"""
self.send_json_message(['stdout', text])
def send_json_message(self, content):
json_msg = json.dumps(content)
self.write_message(json_msg)
def on_message(self, message):
"""Handle incoming websocket message
We send JSON arrays, where the first element is a string indicating
what kind of message this is. Data associated with the message follows.
"""
##logging.info("TermSocket.on_message: %s - (%s) %s", self.term_name, type(message), len(message) if isinstance(message, bytes) else message[:250])
command = json.loads(message)
msg_type = command[0]
if msg_type == "stdin":
self.terminal.ptyproc.write(command[1])
elif msg_type == "set_size":
self.size = command[1:3]
self.terminal.resize_to_smallest()
def on_close(self):
"""Handle websocket closing.
Disconnect from our terminal, and tell the terminal manager we're
disconnecting.
"""
self._log.info("Websocket closed")
if self.terminal:
self.terminal.clients.remove(self)
self.terminal.resize_to_smallest()
self.term_manager.client_disconnected(self)
def on_pty_died(self):
"""Terminal closed: tell the frontend, and close the socket.
"""
self.send_json_message(['disconnect', 1])
self.close()
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