104 lines
3.8 KiB
Python
104 lines
3.8 KiB
Python
from django.db import models
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from django.utils.crypto import get_random_string
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from django.core.mail import EmailMessage, get_connection
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from django.conf import settings
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from django.contrib.contenttypes.fields import GenericForeignKey
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from django.contrib.contenttypes.models import ContentType
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from django.utils.translation import ugettext_lazy as _
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from django.contrib.auth import get_user_model
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import hashlib
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def generate_message_token():
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# /!\ birthday problem
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return get_random_string(length=32, allowed_chars='abcdefghijklmnopqrstuvwxyz0123456789')
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def hexdigest_sha256(*args):
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r = hashlib.sha256()
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for arg in args:
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r.update(str(arg).encode('utf-8'))
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return r.hexdigest()
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class MessageCorrespondent(models.Model):
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email = models.EmailField()
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token = models.CharField(max_length=64, default=generate_message_token, unique=True)
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class MessageThread(models.Model):
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created = models.DateTimeField(auto_now_add=True)
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token = models.CharField(max_length=64, default=generate_message_token, unique=True)
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class MessageManager(models.Manager):
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def get_queyset(self):
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qs = super().get_queryset()
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# Does not work so well as prefetch_related is limited to one content type for generic foreign keys
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qs = qs.prefetch_related('author')
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return qs
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class Message(models.Model):
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created = models.DateTimeField(auto_now_add=True)
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thread = models.ForeignKey(MessageThread)
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author_type = models.ForeignKey(ContentType, on_delete=models.CASCADE, null=True, blank=True)
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author_id = models.PositiveIntegerField(null=True, blank=True)
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author = GenericForeignKey('author_type', 'author_id')
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from_email = models.EmailField()
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content = models.TextField(blank=True)
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token = models.CharField(max_length=64, default=generate_message_token, unique=True)
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objects = MessageManager()
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class Meta:
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ordering = ['created']
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def send_notification(self, subject, sender, dests, reply_to=None, message_id=None, reference=None, footer=None):
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messages = []
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for dest_name, dest_email in dests:
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correspondent, created = MessageCorrespondent.objects.get_or_create(email=dest_email)
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token = self.thread.token + correspondent.token + hexdigest_sha256(settings.SECRET_KEY, self.thread.token, correspondent.token)[:16]
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if reply_to:
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reply_to_name, reply_to_email = reply_to
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reply_to_list = ['%s <%s>' % (reply_to_name, reply_to_email.format(token=token))]
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else:
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reply_to_list = []
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headers = dict()
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if message_id:
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headers.update({
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'Message-ID': message_id.format(id=self.token),
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})
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if message_id and reference:
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headers.update({
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'References': message_id.format(id=reference),
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})
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body = self.content
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if footer is not None:
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body += footer
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messages.append(EmailMessage(
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subject=subject,
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body=body,
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from_email='%s <%s>' % sender,
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to=['%s <%s>' % (dest_name, dest_email)],
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reply_to=reply_to_list,
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headers=headers,
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))
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connection = get_connection()
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connection.send_messages(messages)
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@property
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def author_display(self):
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if self.author:
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author_class = ContentType.objects.get_for_model(self.author).model_class()
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if author_class == get_user_model():
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return self.author.get_full_name()
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else:
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return str(self.author)
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else:
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return self.from_email
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def __str__(self):
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return _("Message from %(author)s") % {'author': self.author_display}
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