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# Copyright 2014 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""WSGI application to manage a USB gadget.
"""
import datetime
import hashlib
import re
import subprocess
import sys
import time
import urllib2
from tornado import httpserver
from tornado import ioloop
from tornado import web
import default_gadget
VERSION_PATTERN = re.compile(r'.*usb_gadget-([a-z0-9]{32})\.zip')
address = None
chip = None
claimed_by = None
default = default_gadget.DefaultGadget()
gadget = None
hardware = None
interface = None
port = None
def SwitchGadget(new_gadget):
if chip.IsConfigured():
chip.Destroy()
global gadget
gadget = new_gadget
gadget.AddStringDescriptor(3, address)
chip.Create(gadget)
class VersionHandler(web.RequestHandler):
def get(self):
version = 'unpackaged'
for path in sys.path:
match = VERSION_PATTERN.match(path)
if match:
version = match.group(1)
break
self.write(version)
class UpdateHandler(web.RequestHandler):
def post(self):
fileinfo = self.request.files['file'][0]
match = VERSION_PATTERN.match(fileinfo['filename'])
if match is None:
self.write('Filename must contain MD5 hash.')
self.set_status(400)
return
content = fileinfo['body']
md5sum = hashlib.md5(content).hexdigest()
if md5sum != match.group(1):
self.write('File hash does not match.')
self.set_status(400)
return
filename = 'usb_gadget-{}.zip'.format(md5sum)
with open(filename, 'wb') as f:
f.write(content)
args = ['/usr/bin/python', filename,
'--interface', interface,
'--port', str(port),
'--hardware', hardware]
if claimed_by is not None:
args.extend(['--start-claimed', claimed_by])
print 'Reloading with version {}...'.format(md5sum)
global http_server
if chip.IsConfigured():
chip.Destroy()
http_server.stop()
child = subprocess.Popen(args, close_fds=True)
while True:
child.poll()
if child.returncode is not None:
self.write('New package exited with error {}.'
.format(child.returncode))
self.set_status(500)
http_server = httpserver.HTTPServer(app)
http_server.listen(port)
SwitchGadget(gadget)
return
try:
f = urllib2.urlopen('http://{}/version'.format(address))
if f.getcode() == 200:
# Update complete, wait 1 second to make sure buffers are flushed.
io_loop = ioloop.IOLoop.instance()
io_loop.add_timeout(datetime.timedelta(seconds=1), io_loop.stop)
return
except urllib2.URLError:
pass
time.sleep(0.1)
class ClaimHandler(web.RequestHandler):
def post(self):
global claimed_by
if claimed_by is None:
claimed_by = self.get_argument('session_id')
else:
self.write('Device is already claimed by "{}".'.format(claimed_by))
self.set_status(403)
class UnclaimHandler(web.RequestHandler):
def post(self):
global claimed_by
claimed_by = None
if gadget != default:
SwitchGadget(default)
class UnconfigureHandler(web.RequestHandler):
def post(self):
SwitchGadget(default)
class DisconnectHandler(web.RequestHandler):
def post(self):
if chip.IsConfigured():
chip.Destroy()
class ReconnectHandler(web.RequestHandler):
def post(self):
if not chip.IsConfigured():
chip.Create(gadget)
app = web.Application([
(r'/version', VersionHandler),
(r'/update', UpdateHandler),
(r'/claim', ClaimHandler),
(r'/unclaim', UnclaimHandler),
(r'/unconfigure', UnconfigureHandler),
(r'/disconnect', DisconnectHandler),
(r'/reconnect', ReconnectHandler),
])
http_server = httpserver.HTTPServer(app)
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