src/cover/forms.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
   6 from django import forms
   7 from django.conf import settings
   8 from django.utils.translation import ugettext_lazy as _, ugettext
   9 from cover.models import Image
  10 from django.utils.safestring import mark_safe
  11 from PIL import Image as PILImage
  12
  13 from cover.utils import get_import_data, FlickrError, URLOpener
  14
  15
  16 class ImageAddForm(forms.ModelForm):
  17     class Meta:
  18         model = Image
  19         exclude = []
  20
  21     def __init__(self, *args, **kwargs):
  22         super(ImageAddForm, self).__init__(*args, **kwargs)
  23         self.fields['file'].required = False
  24         self.fields['use_file'].required = False
  25         self.fields['cut_top'].required = False
  26         self.fields['cut_left'].required = False
  27         self.fields['cut_bottom'].required = False
  28         self.fields['cut_right'].required = False
  29
  30     def clean_download_url(self):
  31         cl = self.cleaned_data['download_url'] or None
  32         if cl is not None:
  33             try:
  34                 img = Image.objects.get(download_url=cl)
  35             except Image.DoesNotExist:
  36                 pass
  37             else:
  38                 raise forms.ValidationError(mark_safe(
  39                     ugettext('Image <a href="%(url)s">already in repository</a>.')
  40                     % {'url': img.get_absolute_url()}))
  41         return cl
  42
  43     def clean_source_url(self):
  44         source_url = self.cleaned_data['source_url'] or None
  45         if source_url is not None:
  46             same_source = Image.objects.filter(source_url=source_url)
  47             if same_source:
  48                 raise forms.ValidationError(mark_safe(
  49                     ugettext('Image <a href="%(url)s">already in repository</a>.')
  50                     % {'url': same_source.first().get_absolute_url()}))
  51         return source_url
  52
  53     def clean(self):
  54         cleaned_data = super(ImageAddForm, self).clean()
  55         download_url = cleaned_data.get('download_url', None)
  56         uploaded_file = cleaned_data.get('file', None)
  57         if not download_url and not uploaded_file:
  58             raise forms.ValidationError(ugettext('No image specified'))
  59         if download_url:
  60             image_data = URLOpener().open(download_url).read()
  61             width, height = PILImage.open(BytesIO(image_data)).size
  62         else:
  63             width, height = PILImage.open(uploaded_file.file).size
  64         min_width, min_height = settings.MIN_COVER_SIZE
  65         if width < min_width or height < min_height:
  66             raise forms.ValidationError(ugettext('Image too small: %sx%s, minimal dimensions %sx%s') %
  67                                         (width, height, min_width, min_height))
  68         return cleaned_data
  69
  70
  71 class ImageEditForm(forms.ModelForm):
  72     """Form used for editing a Book."""
  73     class Meta:
  74         model = Image
  75         exclude = ['download_url']
  76
  77     def clean(self):
  78         cleaned_data = super(ImageEditForm, self).clean()
  79         uploaded_file = cleaned_data.get('file', None)
  80         width, height = PILImage.open(uploaded_file.file).size
  81         min_width, min_height = settings.MIN_COVER_SIZE
  82         if width < min_width or height < min_height:
  83             raise forms.ValidationError(ugettext('Image too small: %sx%s, minimal dimensions %sx%s') %
  84                                         (width, height, min_width, min_height))
  85
  86
  87 class ReadonlyImageEditForm(ImageEditForm):
  88     """Form used for not editing an Image."""
  89
  90     def __init__(self, *args, **kwargs):
  91         super(ReadonlyImageEditForm, self).__init__(*args, **kwargs)
  92         for field in self.fields.values():
  93             field.widget.attrs.update({"readonly": True})
  94
  95     def save(self, *args, **kwargs):
  96         raise AssertionError("ReadonlyImageEditForm should not be saved.")
  97
  98
  99 class ImportForm(forms.Form):
 100     source_url = forms.URLField(label=_('WikiCommons, MNW or Flickr URL'))
 101
 102     def clean_source_url(self):
 103         url = self.cleaned_data['source_url']
 104         try:
 105             import_data = get_import_data(url)
 106         except FlickrError as e:
 107             raise forms.ValidationError(e)
 108         for field_name in ('license_url', 'license_name', 'author', 'title', 'download_url'):
 109             self.cleaned_data[field_name] = import_data[field_name]
 110         return import_data['source_url']
 111