rest.py

import ssl
import socket
import errno
import select
import asyncore
import base64
import re
import json
import urllib
import irc as Irc
from datetime import datetime, timedelta
from configfile import Config
import hgpoll as HgPoll

g_credentials = None
g_portnumber = None
g_throttle = []

valid_repos = ['Torr_Samaho/zandronum', 'Torr_Samaho/zandronum-stable',
	'crimsondusk/zandronum-sandbox', 'crimsondusk/zandronum-sandbox-stable']

def is_throttled (address):
	i = 0

	while i < len (g_throttle):
		if g_throttle[i][1] <= datetime.utcnow():
			print 'Throttle of %s expired' % g_throttle[i][0]
			item = g_throttle.pop (i) # expired

			if item[0] == address:
				return False # this address expired

			continue

		if g_throttle[i][0] == address:
			return True # is throttled

		i += 1

	return False # not throttled

def throttle (address):
	tt = datetime.utcnow() + timedelta (0, 30)

	try:
		# attempt to just update the item
		g_throttle[g_throttle.index (address)][1] = tt
	except ValueError:
		# not in list
		g_throttle.append ([address, tt])

	Irc.broadcast ('Throttling %s for 30 seconds' % address)

def handle_rest_http (data, address):
	global g_credentials
	displayaddress = address
	authrex = re.compile (r'^authorization: Basic (.+)$')
	payloadrex = re.compile (r'^payload=(.+)$')
	authenticated = False
	payload = ''

	if not g_credentials:
		g_credentials = base64.b64encode (Config.get_node ('rest').get_value ('credentials'))

	# Authenticate and find the payload
	for line in data:
		match = authrex.match (line)

		if match and match.group (1) == g_credentials:
			authenticated = True
			continue

		match = payloadrex.match (line)
		if match:
			payload = match.group (1)

	if not authenticated:
		Irc.broadcast ('%s failed to authenticate' % address)
		throttle (address)
		return

	jsonstring = urllib.unquote_plus (payload).decode ('utf-8')

	try:
		jsondata = json.loads (jsonstring)
		repodata = jsondata['repository']
		repo_fullname = '%s/%s' % (repodata['owner'], repodata['name'])

		if repo_fullname not in valid_repos:
			raise ValueError ('unknown repository %s' % repo_fullname)

		commit_data = []

		if 'commits' in jsondata:
			for commit in jsondata['commits']:
				commit_data.append ([commit['node'], commit['message']])

			if len (commit_data) > 0:
				HgPoll.process_new_commits (repodata['name'], commit_data)
	except Exception as e:
		Irc.broadcast ('%s provided bad JSON: %s' % (address, e))

		try:
			with open ('rejected_json.txt', 'w') as fp:
				fp.write (jsonstring)
			Irc.broadcast ('bad json written to rejected_json.txt')
		except:
			Irc.broadcast ('failed to log json')
			pass

		throttle (address)
		return

class RESTConnection (asyncore.dispatcher):
	httpdata = ''
	writebuffer = ''
	address = None

	def __init__ (self, conn, address):
		asyncore.dispatcher.__init__ (self, conn)
		self.socket = ssl.wrap_socket (conn, server_side=True, keyfile='key.pem',
			certfile='cert.pem', do_handshake_on_connect=False)
		self.socket.settimeout (3)
		self.address = address

		while True:
			try:
				self.socket.do_handshake()
				break
			except ssl.SSLError, err:
				if err.args[0] == ssl.SSL_ERROR_WANT_READ:
					select.select([self.socket], [], [])
				elif err.args[0] == ssl.SSL_ERROR_WANT_WRITE:
					select.select([], [self.socket], [])
				else:
					Irc.broadcast ('%s:%s: SSL error: %s' % (self.address[0], err))
					throttle (self.address[0])
					self.close()
					return

	def write (self, msg):
		self.writebuffer += msg

	def readable (self):
		return True

	def writable (self):
		return self.writebuffer

	def handle_close (self):
		self.finish()

	def handle_read (self):
		while 1:
			try:
				data = self.recv (4096)
			except:
				# EOF
				self.finish()
				return

			self.httpdata += data.replace ('\r', '')

	def finish (self):
		handle_rest_http (self.httpdata.split ('\n'), self.address[0])
		self.close()

	def handle_write (self):
		self.send (self.writebuffer)
		self.writebuffer=''

	def handle_error (self):
		raise

class RESTServer (asyncore.dispatcher):
	def __init__ (self):
		global g_portnumber

		if g_portnumber == None:
			g_portnumber = Config.get_node ('rest').get_value ('port')

		asyncore.dispatcher.__init__ (self)
		self.create_socket (socket.AF_INET, socket.SOCK_STREAM)
		self.setsockopt (socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
		self.bind (('', g_portnumber))
		self.listen (5)
		print 'REST server initialized'

	def handle_accept (self):
		sock, address = self.accept()

		if is_throttled (address):
			# throttled
			sock.close()
			return

		conn = RESTConnection (sock, address)

	def handle_error (self):
		return