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