apps/cover/views.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 os.path
   7 from django.conf import settings
   8 from django.contrib.auth.decorators import permission_required
   9 from django.http import HttpResponse, HttpResponseRedirect, Http404
  10 from django.shortcuts import get_object_or_404, render
  11 from django.views.decorators.csrf import csrf_exempt
  12 from django.views.decorators.http import require_POST
  13 from catalogue.helpers import active_tab
  14 from catalogue.models import Chunk
  15 from cover.models import Image
  16 from cover import forms
  17
  18 PREVIEW_SIZE = (216, 300)
  19
  20
  21 def preview(request, book, chunk=None, rev=None):
  22     """Creates a cover image.
  23
  24     If chunk and rev number are given, use version from given revision.
  25     If rev is not given, use publishable version.
  26     """
  27     from PIL import Image
  28     from librarian.cover import DefaultEbookCover
  29     from librarian.dcparser import BookInfo
  30
  31     chunk = Chunk.get(book, chunk)
  32     if rev is not None:
  33         try:
  34             revision = chunk.at_revision(rev)
  35         except Chunk.change_model.DoesNotExist:
  36             raise Http404
  37     else:
  38         revision = chunk.publishable()
  39         if revision is None:
  40             raise Http404
  41     xml = revision.materialize().encode('utf-8')
  42
  43     try:
  44         info = BookInfo.from_string(xml)
  45     except:
  46         return HttpResponseRedirect(os.path.join(settings.STATIC_URL, "img/sample_cover.png"))
  47     cover = DefaultEbookCover(info)
  48     response = HttpResponse(content_type=cover.mime_type())
  49     image = cover.image().resize(PREVIEW_SIZE, Image.ANTIALIAS)
  50     image.save(response, cover.format)
  51     return response
  52
  53
  54 @csrf_exempt
  55 @require_POST
  56 def preview_from_xml(request):
  57     from hashlib import sha1
  58     from PIL import Image
  59     from os import makedirs
  60     from lxml import etree
  61     from librarian.cover import DefaultEbookCover
  62     from librarian.dcparser import BookInfo
  63
  64     xml = request.POST['xml']
  65     try:
  66         info = BookInfo.from_string(xml.encode('utf-8'))
  67     except:
  68         return HttpResponse(os.path.join(settings.STATIC_URL, "img/sample_cover.png"))
  69     coverid = sha1(etree.tostring(info.to_etree())).hexdigest()
  70     cover = DefaultEbookCover(info)
  71
  72     cover_dir = 'cover/preview'
  73     try:
  74         makedirs(os.path.join(settings.MEDIA_ROOT, cover_dir))
  75     except OSError:
  76         pass
  77     fname = os.path.join(cover_dir, "%s.%s" % (coverid, cover.ext()))
  78     image = cover.image().resize(PREVIEW_SIZE, Image.ANTIALIAS)
  79     image.save(os.path.join(settings.MEDIA_ROOT, fname))
  80     return HttpResponse(os.path.join(settings.MEDIA_URL, fname))
  81
  82
  83 @active_tab('cover')
  84 def image(request, pk):
  85     image = get_object_or_404(Image, pk=pk)
  86
  87     if request.user.has_perm('cover.change_image'):
  88         if request.method == "POST":
  89             form = forms.ImageEditForm(request.POST, request.FILES, instance=image)
  90             if form.is_valid():
  91                 form.save()
  92                 return HttpResponseRedirect(image.get_absolute_url())
  93         else:
  94             form = forms.ImageEditForm(instance=image)
  95         editable = True
  96     else:
  97         form = forms.ReadonlyImageEditForm(instance=image)
  98         editable = False
  99
 100     return render(request, "cover/image_detail.html", {
 101         "object": Image.objects.get(id=image.id),
 102         "form": form,
 103         "editable": editable,
 104     })
 105
 106
 107 @active_tab('cover')
 108 def image_list(request):
 109     return render(request, "cover/image_list.html", {
 110         'object_list': Image.objects.all(),
 111         'can_add': request.user.has_perm('cover.add_image'),
 112     })
 113
 114
 115 @permission_required('cover.add_image')
 116 @active_tab('cover')
 117 def add_image(request):
 118     form = ff = None
 119     if request.method == 'POST':
 120         if request.POST.get('form_id') == 'flickr':
 121             ff = forms.FlickrForm(request.POST)
 122             if ff.is_valid():
 123                 form = forms.ImageAddForm(ff.cleaned_data)
 124         else:
 125             form = forms.ImageAddForm(request.POST, request.FILES)
 126             if form.is_valid():
 127                 obj = form.save()
 128                 return HttpResponseRedirect(obj.get_absolute_url())
 129     if form is None:
 130         form = forms.ImageAddForm()
 131     if ff is None:
 132         ff = forms.FlickrForm()
 133     return render(request, 'cover/add_image.html', {
 134             'form': form,
 135             'ff': ff,
 136         })