src/cover/models.py

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