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