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