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# Copyright 2014 The Chromium Authors
# 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.
"""
from __future__ import print_function
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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