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