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[redakcja.git] / 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 io import BytesIO
5 from django.core.files.base import ContentFile
6 from django.core.files.storage import FileSystemStorage
7 from django.db import models
8 from django.db.models.signals import post_save
9 from django.dispatch import receiver
10 from django.urls import reverse
11 from django.utils.translation import ugettext_lazy as _
12 from django.contrib.sites.models import Site
13 from PIL import Image as PILImage
14 from cover.utils import URLOpener
15
16
17 class OverwriteStorage(FileSystemStorage):
18
19     def get_available_name(self, name, max_length=None):
20         self.delete(name)
21         return name
22
23
24 class Image(models.Model):
25     title = models.CharField(max_length=255, verbose_name=_('title'))
26     author = models.CharField(max_length=255, verbose_name=_('author'))
27     license_name = models.CharField(max_length=255, verbose_name=_('license name'))
28     license_url = models.URLField(max_length=255, blank=True, verbose_name=_('license URL'))
29     source_url = models.URLField(verbose_name=_('source URL'), null=True, blank=True)
30     download_url = models.URLField(unique=True, verbose_name=_('image download URL'), null=True, blank=True)
31     file = models.ImageField(
32         upload_to='cover/image',
33         storage=OverwriteStorage(),
34         verbose_name=_('file')
35     )
36     use_file = models.ImageField(
37         upload_to='cover/use',
38         storage=OverwriteStorage(),
39         editable=True,
40         verbose_name=_('file for use')
41     )
42     cut_top = models.IntegerField(default=0, )
43     cut_bottom = models.IntegerField(default=0)
44     cut_left = models.IntegerField(default=0)
45     cut_right = models.IntegerField(default=0)
46
47     class Meta:
48         verbose_name = _('cover image')
49         verbose_name_plural = _('cover images')
50
51     def __str__(self):
52         return u"%s - %s" % (self.author, self.title)
53
54     def save(self, **kwargs):
55         super().save(**kwargs)
56         img = self.file
57         if self.cut_top or self.cut_bottom or self.cut_left or self.cut_right:
58             img = PILImage.open(img)
59             img = img.crop((
60                 self.cut_left,
61                 self.cut_top,
62                 img.size[0] - self.cut_right,
63                 img.size[1] - self.cut_bottom,
64             ))
65             buffer = BytesIO()
66             img.save(
67                 buffer,
68                 format='JPEG',
69             )
70             img = ContentFile(buffer.getvalue())
71         self.use_file.save(
72             "%d.jpg" % self.pk,
73             img,
74             save=False
75         )
76         super().save(**kwargs)
77     
78     def get_absolute_url(self):
79         return reverse('cover_image', args=[self.id])
80
81     def get_full_url(self):
82         return "http://%s%s" % (Site.objects.get_current().domain, self.get_absolute_url())
83
84
85 @receiver(post_save, sender=Image)
86 def download_image(sender, instance, **kwargs):
87     if instance.pk and not instance.file:
88         t = URLOpener().open(instance.download_url).read()
89         instance.file.save("%d.jpg" % instance.pk, ContentFile(t))