#!/usr/bin/python
# -*- mode: python; coding: utf-8 -*-

from __future__ import division
import sys
import dbus
from optparse import OptionParser
import locale
import datetime
import re
import os

locale.setlocale(locale.LC_ALL, u'')

tablewords = {
    'Name': u'Name',
    'Enabled': u'Enabled',
    'Timeout': u'Timeout',
    'LastCheckedOK': u'Last Successful Check',
    'Created': u'Created',
    'Interval': u'Interval',
    'Host': u'Host',
    'Fingerprint': u'Fingerprint',
    'CheckerRunning': u'Check Is Running',
    'LastEnabled': u'Last Enabled',
    'Checker': u'Checker',
    }
defaultkeywords = ('Name', 'Enabled', 'Timeout', 'LastCheckedOK')
domain = 'se.bsnet.fukt'
busname = domain + '.Mandos'
server_path = '/'
server_interface = domain + '.Mandos'
client_interface = domain + '.Mandos.Client'
version = "1.0.14"

def timedelta_to_milliseconds(td):
    "Convert a datetime.timedelta object to milliseconds"
    return ((td.days * 24 * 60 * 60 * 1000)
            + (td.seconds * 1000)
            + (td.microseconds // 1000))

def milliseconds_to_string(ms):
    td = datetime.timedelta(0, 0, 0, ms)
    return (u"%(days)s%(hours)02d:%(minutes)02d:%(seconds)02d"
            % { "days": "%dT" % td.days if td.days else "",
                "hours": td.seconds // 3600,
                "minutes": (td.seconds % 3600) // 60,
                "seconds": td.seconds % 60,
                })


def string_to_delta(interval):
    """Parse a string and return a datetime.timedelta

    >>> string_to_delta('7d')
    datetime.timedelta(7)
    >>> string_to_delta('60s')
    datetime.timedelta(0, 60)
    >>> string_to_delta('60m')
    datetime.timedelta(0, 3600)
    >>> string_to_delta('24h')
    datetime.timedelta(1)
    >>> string_to_delta(u'1w')
    datetime.timedelta(7)
    >>> string_to_delta('5m 30s')
    datetime.timedelta(0, 330)
    """
    timevalue = datetime.timedelta(0)
    regexp = re.compile("\d+[dsmhw]")
    
    for s in regexp.findall(interval):
        try:
            suffix = unicode(s[-1])
            value = int(s[:-1])
            if suffix == u"d":
                delta = datetime.timedelta(value)
            elif suffix == u"s":
                delta = datetime.timedelta(0, value)
            elif suffix == u"m":
                delta = datetime.timedelta(0, 0, 0, 0, value)
            elif suffix == u"h":
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
            elif suffix == u"w":
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
            else:
                raise ValueError
        except (ValueError, IndexError):
            raise ValueError
        timevalue += delta
    return timevalue

def print_clients(clients, keywords):
    def valuetostring(value, keyword):
        if type(value) is dbus.Boolean:
            return u"Yes" if value else u"No"
        if keyword in (u"timeout", u"interval"):
            return milliseconds_to_string(value)
        return unicode(value)
    
    # Create format string to print table rows
    format_string = u' '.join(u'%%-%ds' %
                              max(len(tablewords[key]),
                                  max(len(valuetostring(client[key],
                                                        key))
                                      for client in
                                      clients))
                              for key in keywords)
    # Print header line
    print format_string % tuple(tablewords[key] for key in keywords)
    for client in clients:
        print format_string % tuple(valuetostring(client[key], key)
                                    for key in keywords)
def has_actions(options):
    return any((options.enable,
                options.disable,
                options.bump_timeout,
                options.start_checker,
                options.stop_checker,
                options.is_enabled,
                options.remove,
                options.checker is not None,
                options.timeout is not None,
                options.interval is not None,
                options.host is not None,
                options.secret is not None,
                options.approve,
                options.deny))
        
def main():
	parser = OptionParser(version = "%%prog %s" % version)
	parser.add_option("-a", "--all", action="store_true",
	                  help="Select all clients")
	parser.add_option("-v", "--verbose", action="store_true",
	                  help="Print all fields")
	parser.add_option("-e", "--enable", action="store_true",
	                  help="Enable client")
	parser.add_option("-d", "--disable", action="store_true",
	                  help="disable client")
	parser.add_option("-b", "--bump-timeout", action="store_true",
	                  help="Bump timeout for client")
	parser.add_option("--start-checker", action="store_true",
	                  help="Start checker for client")
	parser.add_option("--stop-checker", action="store_true",
	                  help="Stop checker for client")
	parser.add_option("-V", "--is-enabled", action="store_true",
	                  help="Check if client is enabled")
	parser.add_option("-r", "--remove", action="store_true",
	                  help="Remove client")
	parser.add_option("-c", "--checker", type="string",
	                  help="Set checker command for client")
	parser.add_option("-t", "--timeout", type="string",
	                  help="Set timeout for client")
	parser.add_option("-i", "--interval", type="string",
	                  help="Set checker interval for client")
	parser.add_option("-H", "--host", type="string",
	                  help="Set host for client")
	parser.add_option("-s", "--secret", type="string",
	                  help="Set password blob (file) for client")
	parser.add_option("-A", "--approve", action="store_true",
	                  help="Approve any current client request")
	parser.add_option("-D", "--deny", action="store_true",
	                  help="Deny any current client request")
	options, client_names = parser.parse_args()

        if has_actions(options) and not client_names and not options.all:
            parser.error('Options requires clients names or --all.')
        if options.verbose and has_actions(options):
            parser.error('Verbose option can only be used alone or with --all.')
        if options.all and not has_actions(options):
            parser.error('--all requires an action')
            
        try:
            bus = dbus.SystemBus()
            mandos_dbus_objc = bus.get_object(busname, server_path)
        except dbus.exceptions.DBusException:
            print >> sys.stderr, "Could not connect to Mandos server"
            sys.exit(1)
    
        mandos_serv = dbus.Interface(mandos_dbus_objc,
                                     dbus_interface = server_interface)

        #block stderr since dbus library prints to stderr
        null = os.open(os.path.devnull, os.O_RDWR)
        stderrcopy = os.dup(sys.stderr.fileno())
        os.dup2(null, sys.stderr.fileno())
        os.close(null)
        try:
            try:
                mandos_clients = mandos_serv.GetAllClientsWithProperties()
            finally:
                #restore stderr
                os.dup2(stderrcopy, sys.stderr.fileno())
                os.close(stderrcopy)
        except dbus.exceptions.DBusException, e:
            print >> sys.stderr, "Access denied: Accessing mandos server through dbus."
            sys.exit(1)
            
	# Compile list of clients to process
	clients=[]

        if options.all or not client_names:
            clients = (bus.get_object(busname, path) for path in mandos_clients.iterkeys())
        else:
            for name in client_names:
                for path, client in mandos_clients.iteritems():
                    if client['Name'] == name:
                        client_objc = bus.get_object(busname, path)
                        clients.append(client_objc)
                        break
                else:
                    print >> sys.stderr, "Client not found on server: %r" % name
                    sys.exit(1)
            
	if not has_actions(options) and clients:
	    if options.verbose:
	        keywords = ('Name', 'Enabled', 'Timeout', 'LastCheckedOK',
	                    'Created', 'Interval', 'Host', 'Fingerprint',
	                    'CheckerRunning', 'LastEnabled', 'Checker')
            else:
                keywords = defaultkeywords
                
	    print_clients(mandos_clients.values(), keywords)
        else:
            # Process each client in the list by all selected options
            for client in clients:
                if options.remove:
                    mandos_serv.RemoveClient(client.__dbus_object_path__)
                if options.enable:
                    client.Enable(dbus_interface=client_interface)
                if options.disable:
                    client.Disable(dbus_interface=client_interface)
                if options.bump_timeout:
                    client.CheckedOK(dbus_interface=client_interface)
                if options.start_checker:
                    client.StartChecker(dbus_interface=client_interface)
                if options.stop_checker:
                    client.StopChecker(dbus_interface=client_interface)
                if options.is_enabled:
                    sys.exit(0 if client.Get(client_interface,
                                             u"Enabled",
                                             dbus_interface=dbus.PROPERTIES_IFACE)
                             else 1)
                if options.checker:
                    client.Set(client_interface, u"Checker", options.checker,
                               dbus_interface=dbus.PROPERTIES_IFACE)
                if options.host:
                    client.Set(client_interface, u"Host", options.host,
                               dbus_interface=dbus.PROPERTIES_IFACE)
                if options.interval:
                    client.Set(client_interface, u"Interval",
                               timedelta_to_milliseconds
                               (string_to_delta(options.interval)),
                               dbus_interface=dbus.PROPERTIES_IFACE)
                if options.timeout:
                    client.Set(client_interface, u"Timeout",
                               timedelta_to_milliseconds(string_to_delta
                                                         (options.timeout)),
                               dbus_interface=dbus.PROPERTIES_IFACE)
                if options.secret:
                    client.Set(client_interface, u"Secret",
                               dbus.ByteArray(open(options.secret, u'rb').read()),
                               dbus_interface=dbus.PROPERTIES_IFACE)
                if options.approve:
                    client.Approve(dbus.Boolean(True), dbus_interface=client_interface)
                if options.deny:
                    client.Approve(dbus.Boolean(False), dbus_interface=client_interface)

if __name__ == '__main__':
    main()
