gencon-hotel-check.py

#!/usr/bin/env python2
from argparse import Action, ArgumentParser, ArgumentTypeError, SUPPRESS
from datetime import datetime, timedelta
from HTMLParser import HTMLParser
from json import loads as fromJS
from os.path import abspath, dirname, join as pathjoin
from re import compile as reCompile, IGNORECASE as RE_IGNORECASE
from ssl import create_default_context as create_ssl_context, CERT_NONE, SSLError
from sys import version_info
from threading import Thread
from time import sleep
from urllib import urlencode
from urllib2 import HTTPError, Request, URLError, urlopen
import urllib, urllib2

firstDay, lastDay, startDay = datetime(2018, 7, 30), datetime(2018, 8, 8), datetime(2018, 8, 2)
eventUrl = 'https://aws.passkey.com/event/49547714/owner/10909638/rooms/select'

distanceUnits = {
	1: 'blocks',
	2: 'yards',
	3: 'miles',
	4: 'meters',
	5: 'kilometers',
}

class PasskeyParser(HTMLParser):
	def __init__(self, resp):
		HTMLParser.__init__(self)
		self.json = None
		self.feed(resp.read())
		self.close()

	def handle_starttag(self, tag, attrs):
		if tag.lower() == 'script':
			attrs = dict(attrs)
			if attrs.get('id', '').lower() == 'last-search-results':
				self.json = True

	def handle_data(self, data):
		if self.json is True:
			self.json = data

def type_day(arg):
	try:
		d = datetime.strptime(arg, '%Y-%m-%d')
	except ValueError:
		raise ArgumentTypeError("%s is not a date in the form YYYY-MM-DD" % arg)
	if not firstDay <= d <= lastDay:
		raise ArgumentTypeError("%s is outside the Gencon housing block window" % arg)
	return arg

def type_distance(arg):
	if arg == 'connected':
		return arg
	try:
		return float(arg)
	except ValueError:
		raise ArgumentTypeError("invalid float value: '%s'" % arg)

def type_regex(arg):
	try:
		return reCompile(arg, RE_IGNORECASE)
	except Exception, e:
		raise ArgumentTypeError("invalid regex '%s': %s" % (arg, e))

class EmailAction(Action):
	def __call__(self, parser, namespace, values, option_string=None):
		dest = getattr(namespace, self.dest)
		if dest is None:
			dest = []
			setattr(namespace, self.dest, dest)
		dest.append(tuple(['email'] + values))

if version_info < (2, 7, 9):
	print "Requires Python 2.7.9+"
	exit(1)

parser = ArgumentParser()
parser.add_argument('--guests', type = int, default = 1, help = 'number of guests')
parser.add_argument('--children', type = int, default = 0, help = 'number of children')
parser.add_argument('--rooms', type = int, default = 1, help = 'number of rooms')
group = parser.add_mutually_exclusive_group()
group.add_argument('--checkin', type = type_day, metavar = 'YYYY-MM-DD', default = startDay.strftime('%Y-%m-%d'), help = 'check in')
group.add_argument('--wednesday', dest = 'checkin', action = 'store_const', const = (startDay - timedelta(1)).strftime('%Y-%m-%d'), help = 'check in on Wednesday')
parser.add_argument('--checkout', type = type_day, metavar = 'YYYY-MM-DD', default = (startDay + timedelta(3)).strftime('%Y-%m-%d'), help = 'check out')
group = parser.add_mutually_exclusive_group()
group.add_argument('--max-distance', type = type_distance, metavar = 'BLOCKS', help = "max hotel distance that triggers an alert (or 'connected' to require skywalk hotels)")
group.add_argument('--connected', dest = 'max_distance', action = 'store_const', const = 'connected', help = 'shorthand for --max-distance connected')
parser.add_argument('--budget', type = float, metavar = 'PRICE', default = '99999', help = 'max total rate (not counting taxes/fees) that triggers an alert')
parser.add_argument('--hotel-regex', type = type_regex, metavar = 'PATTERN', default = reCompile('.*'), help = 'regular expression to match hotel name against')
parser.add_argument('--room-regex', type = type_regex, metavar = 'PATTERN', default = reCompile('.*'), help = 'regular expression to match room against')
parser.add_argument('--show-all', action = 'store_true', help = 'show all rooms, even if miles away (these rooms never trigger alerts)')
parser.add_argument('--ssl-insecure', action = 'store_false', dest = 'ssl_cert_verify', help = SUPPRESS)
group = parser.add_mutually_exclusive_group()
group.add_argument('--delay', type = int, default = 1, metavar = 'MINS', help = 'search every MINS minute(s)')
group.add_argument('--once', action = 'store_true', help = 'search once and exit')
parser.add_argument('--test', action = 'store_true', dest = 'test', help = 'trigger every specified alert and exit')

group = parser.add_argument_group('required arguments')
group.add_argument('--key', required = True, help = 'key (see the README for more information)')

group = parser.add_argument_group('alerts')
group.add_argument('--popup', dest = 'alerts', action = 'append_const', const = ('popup',), help = 'show a dialog box')
group.add_argument('--cmd', dest = 'alerts', action = 'append', type = lambda arg: ('cmd', arg), metavar = 'CMD', help = 'run the specified command, passing each hotel name as an argument')
group.add_argument('--browser', dest = 'alerts', action = 'append_const', const = ('browser',), help = 'open the Passkey website in the default browser')
group.add_argument('--email', dest = 'alerts', action = EmailAction, nargs = 3, metavar = ('HOST', 'FROM', 'TO'), help = 'send an e-mail')

args = parser.parse_args()
startUrl = "https://aws.passkey.com/reg/%s/null/null/1/0/null" % args.key

sslCtx = create_ssl_context()
if not args.ssl_cert_verify:
	sslCtx.check_hostname = False
	sslCtx.verify_mode = CERT_NONE

# Attempt to check the version against Github, but ignore it if it fails
# Only updating the version when a breaking bug is fixed (a crash or a failure to search correctly)
try:
	version = open(pathjoin(dirname(abspath(__file__)), 'version')).read()
	resp = urlopen('https://raw.githubusercontent.com/mrozekma/gencon-hotel-check/master/version', context = sslCtx)
	if resp.getcode() == 200:
		head = resp.read()
		if version != head:
			print "Warning: This script is out-of-date. If you downloaded it via git, use 'git pull' to fetch the latest version. Otherwise, visit https://github.com/mrozekma/gencon-hotel-check"
			print
except (HTTPError, IOError):
	pass

# Setup the alert handlers
alertFns = []
success = True
for alert in args.alerts or []:
	if alert[0] == 'popup':
		try:
			import win32api
			alertFns.append(lambda preamble, hotels: win32api.MessageBox(0, 'Gencon Hotel Search', "%s\n\n%s" % (preamble, '\n'.join("%s: %s: %s" % (hotel['distance'], hotel['name'], hotel['room']) for hotel in hotels))))
		except ImportError:
			try:
				import Tkinter, tkMessageBox
				def handle(preamble, hotels):
					window = Tkinter.Tk()
					window.wm_withdraw()
					tkMessageBox.showinfo(title = 'Gencon Hotel Search', message = "%s\n\n%s" % (preamble, '\n'.join("%s: %s: %s" % (hotel['distance'], hotel['name'], hotel['room']) for hotel in hotels)))
					window.destroy()
				alertFns.append(handle)
			except ImportError:
				print "Unable to show a popup. Install either win32api (if on Windows) or Tkinter"
				success = False
	elif alert[0] == 'cmd':
		import subprocess
		alertFns.append(lambda preamble, hotels, cmd = alert[1]: subprocess.Popen([cmd] + [hotel['name'] for hotel in hotels]))
	elif alert[0] == 'browser':
		import webbrowser
		alertFns.append(lambda preamble, hotels: webbrowser.open(startUrl))
	elif alert[0] == 'email':
		from email.mime.text import MIMEText
		import getpass, smtplib, socket
		_, host, fromEmail, toEmail = alert
		password = getpass.getpass("Enter password for %s (or blank if %s requires no authentication): " % (fromEmail, host))
		def smtpConnect():
			try:
				smtp = smtplib.SMTP_SSL(host)
			except socket.error:
				smtp = smtplib.SMTP(host)
			if password:
				smtp.login(fromEmail, password)
			return smtp
		try:
			smtpConnect()
			def handle(preamble, hotels):
				msg = MIMEText("%s\n\n%s\n\n%s" % (preamble, '\n'.join("  * %s: %s: %s" % (hotel['distance'], hotel['name'].encode('utf-8'), hotel['room'].encode('utf-8')) for hotel in hotels), startUrl), 'plain', 'utf-8')
				msg['Subject'] = 'Gencon Hotel Search'
				msg['From'] = fromEmail
				msg['To'] = toEmail
				smtpConnect().sendmail(fromEmail, toEmail, msg.as_string())
			alertFns.append(handle)
		except Exception, e:
			print e
			success = False

if not success:
	exit(1)
if not alertFns:
	print "Warning: You have no alert methods selected, so you're not going to know about a match unless you're staring at this window when it happens. See the README for more information"
	print

if args.test:
	print "Testing alerts one at a time..."
	preamble = 'This is a test'
	hotels = [{'name': 'Test hotel 1', 'distance': '2 blocks', 'rooms': 1, 'room': 'Queen/Queen suite'}, {'name': 'Test hotel 2', 'distance': '5 blocks', 'rooms': 5, 'room': 'Standard King'}]
	for fn in alertFns:
		fn(preamble, hotels)
	print "Done"
	exit(0)

lastAlerts = set()

def sessionSetup():
	try:
		resp = urlopen(startUrl, context = sslCtx)
	except URLError, e:
		if isinstance(e.reason, SSLError) and e.reason.reason == 'CERTIFICATE_VERIFY_FAILED':
			print e
			print
			print "If Python is having trouble finding your local certificate store, you can bypass this check with --ssl-insecure"
			exit(1)
		print "Session request failed: %s" % e
		return None
	if resp.getcode() != 200:
		print "Session request failed: %d" % resp.getcode()
		return None

	if 'Set-Cookie' not in resp.info():
		print "No session cookie received. Is your key correct?"
		return None
	cookies = resp.info()['Set-Cookie'].split(', ')
	cookies = map(lambda cookie: cookie.split(';')[0], cookies)
	headers = {'Cookie': ';'.join(cookies)}

	# Set search filter
	print "Searching... (%d %s, %d %s, %s - %s, %s)" % (args.guests, 'guest' if args.guests == 1 else 'guests', args.rooms, 'room' if args.rooms == 1 else 'rooms', args.checkin, args.checkout, 'connected' if args.max_distance == 'connected' else 'downtown' if args.max_distance is None else "within %.1f blocks" % args.max_distance)
	data = {
		'hotelId': '0',
		'blockMap.blocks[0].blockId': '0',
		'blockMap.blocks[0].checkIn': args.checkin,
		'blockMap.blocks[0].checkOut': args.checkout,
		'blockMap.blocks[0].numberOfGuests': str(args.guests),
		'blockMap.blocks[0].numberOfRooms': str(args.rooms),
		'blockMap.blocks[0].numberOfChildren': str(args.children),
	}
	try:
		resp = urlopen(Request(eventUrl, urlencode(data), headers), context = sslCtx)
	except URLError:
		resp = None
	if resp is None or resp.getcode() not in (200, 302):
		print "Search failed"
		return None
	return resp

def search(resp):
	global lastAlerts

	parser = PasskeyParser(resp)
	if not parser.json:
		print "Failed to find search results"
		return False

	hotels = fromJS(parser.json)

	print "Results:   (%s)" % datetime.now()
	alerts = []

	print "   %-15s %-10s %-80s %s" % ('Distance', 'Price', 'Hotel', 'Room')
	for hotel in hotels:
		for block in hotel['blocks']:
			# Don't show hotels miles away unless requested
			if hotel['distanceUnit'] == 3 and not args.show_all:
				continue

			connected = ('Skywalk to ICC' in (hotel['messageMap'] or ''))
			simpleHotel = {
				'name': parser.unescape(hotel['name']),
				'distance': 'Skywalk' if connected else "%4.1f %s" % (hotel['distanceFromEvent'], distanceUnits.get(hotel['distanceUnit'], '???')),
				'price': int(sum(inv['rate'] for inv in block['inventory'])),
				'rooms': min(inv['available'] for inv in block['inventory']),
				'room': parser.unescape(block['name']),
			}
			result = "%-15s $%-9s %-80s (%d) %s" % (simpleHotel['distance'], simpleHotel['price'], simpleHotel['name'], simpleHotel['rooms'], simpleHotel['room'])
			# I don't think these distances (yards, meters, kilometers) actually appear in the results, but if they do assume it must be close enough regardless of --max-distance
			closeEnough = hotel['distanceUnit'] in (2, 4, 5) or \
			              (hotel['distanceUnit'] == 1 and (args.max_distance is None or (isinstance(args.max_distance, float) and hotel['distanceFromEvent'] <= args.max_distance))) or \
			              (args.max_distance == 'connected' and connected)
			cheapEnough = simpleHotel['price'] <= args.budget
			regexMatch = args.hotel_regex.search(simpleHotel['name']) and args.room_regex.search(simpleHotel['room'])
			if closeEnough and cheapEnough and regexMatch:
				alerts.append(simpleHotel)
				print ' !',
			else:
				print '  ',
			print result

	if alerts:
		alertHash = {(alert['name'], alert['room']) for alert in alerts}
		if alertHash <= lastAlerts:
			print "Skipped alerts (no new rooms in nearby hotel list)"
		else:
			numHotels = len(set(alert['name'] for alert in alerts))
			preamble = "%d %s near the ICC:" % (numHotels, 'hotel' if numHotels == 1 else 'hotels')
			for fn in alertFns:
				# Run each alert on its own thread since some (e.g. popups) are blocking and some (e.g. e-mail) can throw
				Thread(target = fn, args = (preamble, alerts)).start()
			print "Triggered alerts"
	else:
		alertHash = set()

	print
	lastAlerts = alertHash
	return True

while True:
	resp = sessionSetup()
	if resp is not None:
		search(resp)
		if args.once:
			exit(0)
	sleep(60 * args.delay)