apps/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 import re
   7 from urllib2 import urlopen
   8 from django import forms
   9 from django.utils.translation import ugettext_lazy as _
  10 from cover.models import Image
  11
  12 class ImageAddForm(forms.ModelForm):
  13     class Meta:
  14         model = Image
  15         exclude = []
  16
  17     def __init__(self, *args, **kwargs):
  18         super(ImageAddForm, self).__init__(*args, **kwargs)
  19         self.fields['file'].required = self.fields['download_url'].required = self.fields['source_url'].required = False
  20
  21     def clean_download_url(self):
  22         return self.cleaned_data['download_url'] or None
  23
  24     def clean_source_url(self):
  25         return self.cleaned_data['source_url'] or None
  26
  27     def clean(self):
  28         cleaned_data = super(ImageAddForm, self).clean()
  29         if not cleaned_data.get('download_url', None) and not cleaned_data.get('file', None):
  30             raise forms.ValidationError('No image specified')
  31         return cleaned_data
  32
  33
  34 class ImageEditForm(forms.ModelForm):
  35     """Form used for editing a Book."""
  36     class Meta:
  37         model = Image
  38         exclude = ['download_url']
  39
  40
  41 class ReadonlyImageEditForm(ImageEditForm):
  42     """Form used for not editing a Book."""
  43
  44     def __init__(self, *args, **kwargs):
  45         ret = super(ReadonlyImageEditForm, self).__init__(*args, **kwargs)
  46         for field in self.fields.values():
  47             field.widget.attrs.update({"readonly": True})
  48         return ret
  49
  50     def save(self, *args, **kwargs):
  51         raise AssertionError, "ReadonlyImageEditForm should not be saved."
  52
  53
  54 class FlickrForm(forms.Form):
  55     source_url = forms.URLField(label=_('Flickr URL'))
  56
  57     def clean_source_url(self):
  58         def normalize_html(html):
  59             return re.sub('[\t\n]', '', html)
  60
  61         url = self.cleaned_data['source_url']
  62         m = re.match(r'(https?://)?(www\.|secure\.)?flickr\.com/photos/(?P<author>[^/]+)/(?P<img>\d+)/?', url)
  63         if not m:
  64             raise forms.ValidationError("It doesn't look like Flickr URL.")
  65         author_slug, img_id = m.group('author'), m.group('img')
  66         base_url = "https://www.flickr.com/photos/%s/%s/" % (author_slug, img_id)
  67
  68         try:
  69             html = normalize_html(urlopen(url).read().decode('utf-8'))
  70         except:
  71             raise forms.ValidationError('Error reading page.')
  72         match = re.search(r'<a href="([^"]*)" rel="license cc:license">Some rights reserved</a>', html)
  73         try:
  74             assert match
  75             license_url = match.group(1)
  76             self.cleaned_data['license_url'] = license_url
  77             re_license = re.compile(r'http://creativecommons.org/licenses/([^/]*)/([^/]*)/.*')
  78             m = re_license.match(license_url)
  79             assert m
  80             self.cleaned_data['license_name'] = 'CC %s %s' % (m.group(1).upper(), m.group(2))
  81         except AssertionError:
  82             raise forms.ValidationError('Error reading license name.')
  83
  84         m = re.search(r'"ownername":"([^"]*)', html)
  85         if m:
  86             self.cleaned_data['author'] = "%s@Flickr" % m.group(1)
  87         else:
  88             raise forms.ValidationError('Error reading author name.')
  89
  90         m = re.search(r'<h1[^>]*>(.*?)</h1>', html)
  91         if not m:
  92             raise forms.ValidationError('Error reading image title.')
  93         self.cleaned_data['title'] = m.group(1)
  94
  95         url_size = base_url + "sizes/o/"
  96         html = normalize_html(urlopen(url_size).read().decode('utf-8'))
  97         m = re.search(r'<div id="allsizes-photo">\s*<img src="([^"]*)"', html)
  98         if m:
  99             self.cleaned_data['download_url'] = m.group(1)
 100         else:
 101             raise forms.ValidationError('Error reading image URL.')
 102         return base_url