src/cover/models.py

   1 # This file is part of FNP-Redakcja, licensed under GNU Affero GPLv3 or later.
   2 # Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information.
   3 #
   4 from django.core.files.base import ContentFile
   5 from django.core.files.storage import FileSystemStorage
   6 from django.db import models
   7 from django.db.models.signals import post_save
   8 from django.dispatch import receiver
   9 from django.urls import reverse
  10 from django.utils.translation import ugettext_lazy as _
  11 from django.contrib.sites.models import Site
  12 from cover.utils import URLOpener
  13
  14
  15 class OverwriteStorage(FileSystemStorage):
  16
  17     def get_available_name(self, name, max_length=None):
  18         self.delete(name)
  19         return name
  20
  21
  22 class Image(models.Model):
  23     title = models.CharField(max_length=255, verbose_name=_('title'))
  24     author = models.CharField(max_length=255, verbose_name=_('author'))
  25     license_name = models.CharField(max_length=255, verbose_name=_('license name'))
  26     license_url = models.URLField(max_length=255, blank=True, verbose_name=_('license URL'))
  27     source_url = models.URLField(verbose_name=_('source URL'), null=True, blank=True)
  28     download_url = models.URLField(unique=True, verbose_name=_('image download URL'), null=True, blank=True)
  29     file = models.ImageField(
  30         upload_to='cover/image', storage=OverwriteStorage(), editable=True, verbose_name=_('file'))
  31
  32     class Meta:
  33         verbose_name = _('cover image')
  34         verbose_name_plural = _('cover images')
  35
  36     def __str__(self):
  37         return u"%s - %s" % (self.author, self.title)
  38
  39     def get_absolute_url(self):
  40         return reverse('cover_image', args=[self.id])
  41
  42     def get_full_url(self):
  43         return "http://%s%s" % (Site.objects.get_current().domain, self.get_absolute_url())
  44
  45
  46 @receiver(post_save, sender=Image)
  47 def download_image(sender, instance, **kwargs):
  48     if instance.pk and not instance.file:
  49         t = URLOpener().open(instance.download_url).read()
  50         instance.file.save("%d.jpg" % instance.pk, ContentFile(t))