import datetime, encodings, os, setuptools, socketserver, ssltools, sys, syslog, threading

SYSLOG = 0
STDOUT = 1
STDDEB = 2 # STDOUT + Debug
SILENT = 9 # Quiet mode

SSL = 0
PORT = 1

logging = STDOUT

try:
 exec("logging = " + setuptools.getSetting("Log", "sink"))
except:
 pass

def logger(message, prio=syslog.LOG_INFO, sink=logging):
 if sink in (STDOUT, STDDEB):
  if prio not in (syslog.LOG_NOTICE, syslog.LOG_INFO, syslog.LOG_DEBUG):
   print(message)
   sys.stderr.write(message)
  elif prio != syslog.LOG_DEBUG or sink == STDDEB:
   print(message)
 elif sink == SYSLOG:
  syslog.openlog("KumiStatusServer", syslog.LOG_PID)
  syslog.syslog(prio, message)
 elif sink != SILENT:
  try:
   sys.stderr.write("Unknown logging level %s, assuming STDOUT from now on." % str(sink))
  except:
   pass
  logging = STDOUT
  logger(message, prio, logging)

def listIncluded(host, section):
 for i in setuptools.getListSetting("SSL" if section == 0 else "Ports", "hosts"):
  if i[0].lower() == host.lower():
   return True
 return False

class TCPHandler(socketserver.StreamRequestHandler):
 def readString(self):
  return self.rfile.readline().strip()

 def sendString(self, string):
  self.request.sendall((string + "\n").encode('utf8'))

 def requestHandler(self, request):
  pass

 def worker(self, message):
  content = message.split()
  command = content[0].lower()
  try:
   if command in ("hi"):
    return "HI: Kumi Status v0.8.15 (KSP)"
   elif command in ("heartbeat", "hb", "ping"):
    return "OK: Still here? Wow."
   elif command in ("stat", "status"):
    return "UA: Not currently implemented."
   elif command in ("ssl", "tls"):
    try:
     host = encodings.idna.ToASCII(str(content[1]))
     try:
      port = int(content[2])
     except IndexError:
      port = 443
     if listIncluded(host, SSL):
      expiry = ssltools.getRemoteExpiry(host, port)
      if expiry > datetime.datetime.now():
       dm = "%s certificate is valid until: %s" % (content[1], expiry)
       try:
        delta = int(content[3])
       except:
        delta = 0
       if expiry < datetime.datetime.now() + datetime.timedelta(days=delta):
        return "AL: %s" % dm
       return "OK: %s" % dm
      else:
       return "AL: %s certificate has expired on: %s" % (content[1], expiry)
     else:
      return "NM: %s is not being monitored!" % content[1]
    except:
     return "ER: Could not verify SSL certificate on %s:%i. Is the server down?" % (content[1], int(content[2]))
   elif command == "port":
    return "UA: Not currently implemented."
   elif command in ("req", "request"):
    return "NI: Requesting monitoring is not yet implemented."
   elif command == "help":
    return "UA: Not currently implemented."
   else:
    return "IM: Unknown command %s." % command
  except TypeError as e:
   return "IM: Invalid values passed to %s. Try HELP %s." % (command, command)
  except IndexError as e:
   return "IM: Invalid values passed to %s. Try HELP %s." % (command, command)

 def handle(self):
  remote = self.client_address[0] + ":" + str(self.client_address[1])
  logger("New connection from %s." % remote, syslog.LOG_INFO)
  self.sendString(self.worker("hi"))
  while True:
   message = self.readString().decode('utf8')
   if not message:
    logger("Connection from %s closed." % remote, syslog.LOG_DEBUG)
    break
   logger("%s said: %s" % (remote, message))
   response = self.worker(message)
   if response:
    self.sendString(response)
    logger("Sent to %s: %s" % (remote, response), syslog.LOG_DEBUG)

class TCPServer(socketserver.ThreadingMixIn, socketserver.TCPServer):
 pass

def shutdown(reboot = False, status = 0):
 if reboot:
  args = sys.argv[:]
  args.insert(0, sys.executable)
  try:
   os.execv(sys.executable, args)
  except:
   logger("Restart failed. Shutting down.")
  exit(status)