###
# Copyright (c) 2011, Valentin Lorentz
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright notice,
# this list of conditions, and the following disclaimer.
# * 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.
# * Neither the name of the author of this software nor the name of
# contributors to this software may be used to endorse or promote products
# derived from this software without specific prior written consent.
#
# 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
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# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
###
"""
An embedded and centralized HTTP server for Supybot's plugins.
"""
import os
import cgi
import socket
from threading import Event, Thread
from cStringIO import StringIO
from SocketServer import ThreadingMixIn
from BaseHTTPServer import HTTPServer, BaseHTTPRequestHandler
# For testing purposes
from SocketServer import StreamRequestHandler
import supybot.log as log
import supybot.conf as conf
import supybot.world as world
from supybot.i18n import PluginInternationalization
_ = PluginInternationalization()
configGroup = conf.supybot.servers.http
class RequestNotHandled(Exception):
pass
TEMPLATE_DEFAULTS = {
'index.html': """\
""" + _('Supybot Web server index') + """
""" + _('Here is a list of the plugins that have a Web interface:') +\
"""
%(list)s
""",
'robots.txt': """""",
}
for filename, content in TEMPLATE_DEFAULTS.items():
path = conf.supybot.directories.data.web.dirize(filename)
if not os.path.isfile(path):
with open(path, 'a') as fd:
fd.write(content)
def get_template(filename):
path = conf.supybot.directories.data.web.dirize(filename)
return open(path, 'r').read()
class RealSupyHTTPServer(HTTPServer):
# TODO: make this configurable
timeout = 0.5
running = False
def __init__(self, address, protocol, callback):
if protocol == 4:
self.address_family = socket.AF_INET
elif protocol == 6:
self.address_family = socket.AF_INET6
else:
raise AssertionError(protocol)
HTTPServer.__init__(self, address, callback)
self.callbacks = {}
def hook(self, subdir, callback):
if subdir in self.callbacks:
log.warning(('The HTTP subdirectory `%s` was already hooked but '
'has been claimed by another plugin (or maybe you '
'reloaded the plugin and it didn\'t properly unhook. '
'Forced unhook.') % subdir)
self.callbacks[subdir] = callback
def unhook(self, subdir):
callback = self.callbacks.pop(subdir) # May raise a KeyError. We don't care.
callback.doUnhook(self)
return callback
def __str__(self):
return 'server at %s %i' % self.server_address[0:2]
class TestSupyHTTPServer(RealSupyHTTPServer):
def __init__(self, *args, **kwargs):
self.callbacks = {}
def serve_forever(self, *args, **kwargs):
pass
def shutdown(self, *args, **kwargs):
pass
if world.testing:
SupyHTTPServer = TestSupyHTTPServer
else:
SupyHTTPServer = RealSupyHTTPServer
class SupyHTTPRequestHandler(BaseHTTPRequestHandler):
def do_X(self, callbackMethod, *args, **kwargs):
if self.path == '/':
callback = SupyIndex()
elif self.path == '/robots.txt':
callback = RobotsTxt()
elif self.path == '/favicon.ico':
callback = Favicon()
else:
subdir = self.path.split('/')[1]
try:
callback = self.server.callbacks[subdir]
except KeyError:
callback = Supy404()
# Some shortcuts
for name in ('send_response', 'send_header', 'end_headers', 'rfile',
'wfile', 'headers'):
setattr(callback, name, getattr(self, name))
# We call doX, because this is more supybotic than do_X.
getattr(callback, callbackMethod)(self,
'/' + '/'.join(self.path.split('/')[2:]),
*args, **kwargs)
def do_GET(self):
self.do_X('doGet')
def do_POST(self):
if 'Content-Type' not in self.headers:
self.headers['Content-Type'] = 'application/x-www-form-urlencoded'
form = cgi.FieldStorage(
fp=self.rfile,
headers=self.headers,
environ={'REQUEST_METHOD':'POST',
'CONTENT_TYPE':self.headers['Content-Type'],
})
self.do_X('doPost', form=form)
def do_HEAD(self):
self.do_X('doHead')
def log_message(self, format, *args):
log.info('HTTP request: %s - %s' %
(self.address_string(), format % args))
class SupyHTTPServerCallback:
"""This is a base class that should be overriden by any plugin that want
to have a Web interface."""
name = "Unnamed plugin"
defaultResponse = _("""
This is a default response of the Supybot HTTP server. If you see this
message, it probably means you are developing a plugin, and you have
neither overriden this message or defined an handler for this query.""")
def doGet(self, handler, path, *args, **kwargs):
handler.send_response(400)
self.send_header('Content_type', 'text/plain; charset=utf-8')
self.send_header('Content-Length', len(self.defaultResponse))
self.end_headers()
self.wfile.write(self.defaultResponse)
doPost = doHead = doGet
def doUnhook(self, handler):
"""Method called when unhooking this callback."""
pass
class Supy404(SupyHTTPServerCallback):
"""A 404 Not Found error."""
name = "Error 404"
response = _("""
I am a pretty clever IRC bot, but I suck at serving Web pages, particulary
if I don't know what to serve.
What I'm saying is you just triggered a 404 Not Found, and I am not
trained to help you in such a case.""")
def doGet(self, handler, path, *args, **kwargs):
handler.send_response(404)
self.send_header('Content_type', 'text/plain; charset=utf-8')
self.send_header('Content-Length', len(self.response))
self.end_headers()
self.wfile.write(self.response)
doPost = doHead = doGet
class SupyIndex(SupyHTTPServerCallback):
"""Displays the index of available plugins."""
name = "index"
defaultResponse = _("Request not handled.")
def doGet(self, handler, path):
plugins = [x for x in handler.server.callbacks.items()]
if plugins == []:
plugins = _('No plugins available.')
else:
plugins = '' % ''.join(
['%s' % (x,y.name) for x,y in plugins])
response = get_template('index.html') % {'list': plugins}
handler.send_response(200)
self.send_header('Content_type', 'text/html')
self.send_header('Content-Length', len(response))
self.end_headers()
self.wfile.write(response)
class RobotsTxt(SupyHTTPServerCallback):
"""Serves the robot.txt file to robots."""
name = 'robotstxt'
defaultResponse = _('Request not handled')
def doGet(self, handler, path):
response = get_template('robots.txt')
handler.send_response(200)
self.send_header('Content-type', 'text/plain')
self.send_header('Content-Length', len(response))
self.end_headers()
self.wfile.write(response)
class Favicon(SupyHTTPServerCallback):
"""Services the favicon.ico file to browsers."""
name = 'favicon'
defaultResponse = _('Request not handled')
def doGet(self, handler, path):
file_path = conf.supybot.servers.http.favicon()
found = False
if file_path:
try:
icon = open(file_path, 'r')
found = True
except IOError:
pass
if found:
response = icon.read()
filename = file_path.rsplit(os.sep, 1)[1]
if '.' in filename:
ext = filename.rsplit('.', 1)[1]
else:
ext = 'ico'
# I have no idea why, but this headers are already sent.
# self.send_header('Content-Length', len(response))
# self.send_header('Content-type', 'image/' + ext)
# self.end_headers()
self.wfile.write(response)
else:
response = _('No favicon set.')
handler.send_response(404)
self.send_header('Content-type', 'text/plain')
self.send_header('Content-Length', len(response))
self.end_headers()
self.wfile.write(response)
http_servers = None
def startServer():
"""Starts the HTTP server. Shouldn't be called from other modules.
The callback should be an instance of a child of SupyHTTPServerCallback."""
global http_servers
addresses4 = [(4, (x, configGroup.port()))
for x in configGroup.hosts4().split(' ') if x != '']
addresses6 = [(6, (x, configGroup.port()))
for x in configGroup.hosts6().split(' ') if x != '']
http_servers = []
for protocol, address in (addresses4 + addresses6):
server = SupyHTTPServer(address, protocol, SupyHTTPRequestHandler)
Thread(target=server.serve_forever, name='HTTP Server').start()
http_servers.append(server)
log.info('Starting HTTP server: %s' % str(server))
def stopServer():
"""Stops the HTTP server. Should be run only from this module or from
when the bot is dying (ie. from supybot.world)"""
global http_servers
if http_servers is not None:
for server in http_servers:
log.info('Stopping HTTP server: %s' % str(server))
server.shutdown()
server = None
if configGroup.keepAlive():
startServer()
def hook(subdir, callback):
"""Sets a callback for a given subdir."""
if http_servers is None:
startServer()
assert isinstance(http_servers, list)
for server in http_servers:
server.hook(subdir, callback)
def unhook(subdir):
"""Unsets the callback assigned to the given subdir, and return it."""
global http_servers
assert isinstance(http_servers, list)
for server in http_servers:
callback = server.unhook(subdir)
if len(server.callbacks) <= 0 and not configGroup.keepAlive():
server.shutdown()
http_servers.remove(server)