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@hakib hakib/models.py

Created Feb 12, 2020
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building-interactive-voice-response-ivr-system-python-django-twilio
from django.db import models
class Theater(models.Model):
class Meta:
verbose_name = 'Theater'
verbose_name_plural = 'Theaters'
name = models.CharField(max_length=50)
address = models.TextField()
digits = models.PositiveSmallIntegerField(unique=True)
def __str__(self) -> str:
return self.name
class Movie(models.Model):
class Meta:
verbose_name = 'Movie'
verbose_name_plural = 'Movies'
title = models.CharField(max_length=50)
digits = models.PositiveSmallIntegerField(unique=True)
def __str__(self) -> str:
return self.title
class Show(models.Model):
class Meta:
verbose_name = 'Show'
verbose_name_plural = 'Shows'
movie = models.ForeignKey(Movie, on_delete=models.CASCADE)
theater = models.ForeignKey(Theater, on_delete=models.CASCADE)
starts_at = models.DateTimeField()
import datetime
from django.core.exceptions import SuspiciousOperation
from django.http import HttpRequest, HttpResponse
from django.conf import settings
from django.utils import timezone
from django.shortcuts import reverse
from django.views.decorators.csrf import csrf_exempt
from django.views.decorators.http import require_POST
from twilio.request_validator import RequestValidator
from twilio.twiml.voice_response import VoiceResponse
from .models import Theater, Movie, Show
request_validator = RequestValidator(settings.TWILIO_AUTH_TOKEN)
def validate_django_request(request: HttpRequest):
try:
signature = request.META['HTTP_X_TWILIO_SIGNATURE']
except KeyError:
is_valid_twilio_request = False
else:
is_valid_twilio_request = request_validator.validate(
signature = signature,
uri = request.get_raw_uri(),
params = request.POST,
)
if not is_valid_twilio_request:
# Invalid request from Twilio
raise SuspiciousOperation()
@require_POST
@csrf_exempt
def choose_theater(request: HttpRequest) -> HttpResponse:
validate_django_request(request)
vr = VoiceResponse()
vr.say('Welcome to movie info!')
with vr.gather(
action=reverse('choose-movie'),
finish_on_key='#',
timeout=20,
) as gather:
gather.say('Please choose a theater and press #')
theaters = (
Theater.objects
.filter(digits__isnull=False)
.order_by('digits')
)
for theater in theaters:
gather.say(f'For {theater.name} at {theater.address} press {theater.digits}')
vr.say('We did not receive your selection')
vr.redirect('')
return HttpResponse(str(vr), content_type='text/xml')
@require_POST
@csrf_exempt
def choose_movie(request: HttpRequest) -> HttpResponse:
validate_django_request(request)
vr = VoiceResponse()
digits = request.POST.get('Digits')
try:
theater = Theater.objects.get(digits=digits)
except Theater.DoesNotExist:
vr.say('Please select a theater from the list.')
vr.redirect(reverse('choose-theater'))
else:
with vr.gather(
action=f'{reverse("list-showtimes")}?theater={theater.id}',
finish_on_key='#',
timeout=20,
) as gather:
gather.say('Please choose a movie and press #')
movies = (
Movie.objects
.filter(digits__isnull=False)
.order_by('digits')
)
for movie in movies:
gather.say(f'For {movie.title} press {movie.digits}')
vr.say('We did not receive your selection')
vr.redirect(reverse('choose-theater'))
return HttpResponse(str(vr), content_type='text/xml')
@require_POST
@csrf_exempt
def list_showtimes(request: HttpRequest) -> HttpResponse:
validate_django_request(request)
vr = VoiceResponse()
digits = request.POST.get('Digits')
theater = Theater.objects.get(id=request.GET['theater'])
# Validate the user selection
try:
movie = Movie.objects.get(id=digits)
except Movie.DoesNotExist:
vr.say('Please select a movie from the list.')
vr.redirect(f'{reverse("choose-movie")}?theater={theater.id}')
else:
# User selected movie and theater, search shows in the next 12 hours:
from_time = timezone.now()
until_time = from_time + datetime.timedelta(hours=12)
shows = list(
Show.objects.filter(
theater=theater,
movie=movie,
starts_at__range=(from_time, until_time),
).order_by('starts_at')
)
if len(shows) == 0:
vr.say('Sorry, the movie is not playing any time soon in this theater.')
else:
showtimes = ', '.join(show.starts_at.time().strftime('%I:%M%p') for show in shows)
vr.say(f'The movie {movie.title} will be playing at {theater.name} at {showtimes}')
vr.say('Thank you for using movie info!')
vr.hangup()
return HttpResponse(str(vr), content_type='text/xml')
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