Simple Django FOIA CCing code

models.py

from django.db import models
from django.db.models import Q
from django.conf import settings
from django.utils.functional import cached_property
from django.contrib.postgres.fields import HStoreField, ArrayField
from datetime import date, datetime, time, timedelta
from foiaminder.schedule import SCHEDULES
from business_calendar import Calendar
import requests

class Schedule(models.Model):
    date = models.DateField()
    n = models.IntegerField() # Which number reminder email this is. 
    repeatable = models.BooleanField(default=False)
    foia = models.ForeignKey('FOIA')

    class Meta:
        ordering = ('date',)

    def send_reminder(self):
        return requests.post(
            "https://api.mailgun.net/v3/<MYDOMAIN>/messages",
            auth=("api", settings.MAILGUN_API_KEY),
            data={"from": "FOIA Minder <reminders@foiaminder.mydomain.com>",
                  "to": [self.foia.sender],
                  "h:References": self.foia.primary_email.message_id,
                  "subject": "REMINDER: %s" % self.foia.display_subject(),
                  "text": "You have an action due on the data request mentioned above."})

    def push_forward(self):
        """
        Pushes us forward by the every-after interval, so we can keep
        on bird-dogging old requests. Never give up, never surrender.
        """
        repeat = self.foia.get_schedule_data().get('every-after')
        self.date = self.foia.add_days(self.date, repeat)
        self.n += 1
        self.save()

class FOIA(models.Model):
    #agency = models.CharField(max_length=255, null=True, blank=True)
    sender = models.CharField(max_length=255)
    subject = models.CharField(max_length=255)
    body_html = models.TextField()
    text = models.TextField()
    is_active = models.BooleanField(default=True)
    participants = ArrayField(models.CharField(max_length=255)) # The participants field of the initial email
    type = models.CharField(max_length=255)
    timestamp = models.DateTimeField()
    closed_on = models.DateTimeField(null=True, blank=True)
    notes = models.TextField() # this could be helpful


    class Meta:
        ordering = ('-timestamp',)

    def next_date(self):
        try:
            return self.schedule_set.all()[0].date
        except IndexError:
            return None 
    
    @property
    def primary_email(self):
        return self.email_set.get(primary=True)

    def close(self):
        self.is_active = False
        self.closed_on = datetime.now()
        self.save()
        self.schedule_set.all().delete() #kill any planned schedules.

    def days_since(self):
        if self.is_active:
            dt = date.today() - self.timestamp.date()
        else:
            dt = self.closed_on.date() - self.timestamp.date()
        return dt.days

    def display_subject(self):
        return self.subject.replace("Fwd: ", "").replace("Re: ", "")

    def get_schedule_data(self):
        return SCHEDULES.get(self.type)

    def add_days(self, date, interval):
        cal = Calendar()
        sched = self.get_schedule_data()
        if sched.get('business-days'):
            return cal.addbusdays(date, interval)
        else:
            return date + timedelta(days=interval)
    
    def to_schedule(self):
        sched = self.get_schedule_data()
        date = self.timestamp.date()
        # If it's past 6pm, it's really the next day.
        if self.timestamp.time() >= time(hour=18):
            date += timedelta(days=1)
        
        for i, interval in enumerate(sched.get('days')):
            date = self.add_days(date, interval)
            Schedule.objects.create(date=date, foia=self, n=i)

        repeat = sched.get('every-after')
        if repeat:
            Schedule.objects.create(date = self.add_days(date, repeat),
                foia = self,
                n = i+1,
                repeatable = True
                )

    def save(self, *args, **kwargs):
        # If we haven't been saved, save and create a schedule.
        if not self.id:
            super(FOIA, self).save(*args, **kwargs)
            self.to_schedule()
            return
        return super(FOIA, self).save(*args, **kwargs)
            

class Email(models.Model):
    body_html = models.TextField()
    text= models.TextField()
    timestamp = models.DateTimeField()
    sender = models.CharField(max_length=255)
    recipient = models.CharField(max_length=255)
    subject = models.CharField(max_length=255)
    cc = models.TextField()
    to = models.TextField()
    bcc = models.TextField()
    primary = models.BooleanField(default=False)
    message_id = models.CharField(max_length=255, null=True, blank=True)
    in_reply_to = models.CharField(max_length=255, null=True, blank=True)
    references = models.CharField(max_length=255, null=True, blank=True)

    participants = ArrayField(models.CharField(max_length=255))

    foia = models.ForeignKey(FOIA, null=True, blank=True)

    @cached_property
    def text_lower(self):
        return self.text.lower()

    def parse_hashtags(self):
        return [i[1:]  for i in self.text_lower.split() if i.startswith("#") ]

    def get_schedule(self):
        sched = self.recipient.split('@')[0].lower()
        if not SCHEDULES.has_key(sched):
            sched = 'default'
        return sched

    @property
    def references_list(self):
        try:
            return self.references.split()
        except:
            return None

    @property
    def in_reply_to_list(self):
        try:
            return self.in_reply_to.split()
        except:
            return None

    def save(self, *args, **kwargs):
        if self.id:
            return super(Email, self).save(*args, **kwargs)

        if self.primary:
            foia = FOIA.objects.create(
                subject = self.subject,
                body_html = self.body_html,
                text = self.text,
                participants = self.participants,
                type = self.get_schedule(),
                sender = self.sender,
                timestamp = self.timestamp
                )
        else:
            foia = FOIA.objects.get(
                Q(email__message_id__in=self.references_list) |
                Q(email__message_id__in=self.in_reply_to_list)
                )

        self.foia = foia

        # Quick one to match 'closed.', 'closed!', "#closed it", "CLOSED" etc.
        if any(['closed' in hashtag for hashtag in self.parse_hashtags()]) or 'closed' in self.text_lower.strip():
            foia.close()

        return super(Email, self).save(*args, **kwargs)

schedule.py

SCHEDULES = {
    'ny': {
        'days': [5, 20, 30],
        'every-after': 5,
        'business-days': True
    },
    'ca': {
        'days': [10, 14],
        'every-after': 7,
        'business-days': False
    },
    'foia': {
        'days': [30],
        'every-after': 14,
        'business-days': False
    },
    'default':  {
        'days': [30],
        'every-after': 14,
        'business-days': False
    }
}

views.py

from django.shortcuts import render
from django.http import HttpResponse
from django.db.models import Q
from datetime import datetime
from email import utils
from models import FOIA, Email, Schedule
from django.views.decorators.csrf import csrf_exempt
from pprint import pprint
from django.contrib.auth.decorators import login_required


def status(request):
    return HttpResponse("OK")

@login_required(login_url='/login/google-oauth2')
def index(request):
    foias = FOIA.objects.filter(sender=request.user.email)
    # Sometimes you might wanna see it all....
    if request.GET.get('all') and '@mydomain.com' in request.user.email:
        foias = FOIA.objects.all()
    d = {'foias': foias}
    return render(request, 'list.html', d)

# Normally Django will vomit a 403 if you get a POST without a CSRF token.
# Since we're getting these request externally, we need to mark the view exempt.
@csrf_exempt
def rcv(request):
    pprint(dict(request.POST.iterlists()))
    sender      = request.POST.get('sender', '')
    recipient   = request.POST.get('recipient', '')
    subject     = request.POST.get('subject', '')
    body_html   = request.POST.get('body-html', '')
    text        = request.POST.get('stripped-text', '')
    cc          = request.POST.get('Cc', '')
    to          = request.POST.get('To', '')
    bcc         = request.POST.get('Bcc','')
    file_count  = request.POST.get('attachment-count', 0)
    message_id  = request.POST.get('Message-Id', '')
    in_reply_to = request.POST.get('In-Reply-To', '')
    references  = request.POST.get('References', '')
    timestamp   = request.POST.get('timestamp')

    participants = [a[1] for a in utils.getaddresses([cc] + [bcc] + [to]) if a[1] != '' and 'foiaminder' not in a[1] ]

    if Email.objects.filter(message_id=message_id):
        return HttpResponse("Duplicate")

    primary = True
    if Email.objects.filter(
        Q(message_id__in=in_reply_to.split()) |
        Q(message_id__in=references.split())
        ):
        primary = False

    raw = dict(request.POST.iterlists())

    email = Email.objects.create(
        body_html = body_html,
        text = text,
        timestamp = datetime.fromtimestamp(float(timestamp)),
        sender = sender,
        recipient = recipient,
        subject = subject,
        cc = cc,
        to = to,
        bcc = bcc,
        message_id = message_id,
        in_reply_to = in_reply_to or None,
        references = references or None,
        participants = participants,
        primary = primary
        #raw = raw
        )

    return HttpResponse("OK")