src/cover/views.py

   1 # This file is part of FNP-Redakcja, licensed under GNU Affero GPLv3 or later.
   2 # Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information.
   3 #
   4 import os.path
   5 from django.conf import settings
   6 from django.contrib.auth.decorators import permission_required
   7 from django.http import HttpResponse, HttpResponseRedirect, Http404
   8 from django.shortcuts import get_object_or_404, render
   9 from django.views.decorators.csrf import csrf_exempt
  10 from django.views.decorators.http import require_POST
  11 from catalogue.helpers import active_tab
  12 from catalogue.models import Chunk
  13 from cover.models import Image
  14 from cover import forms
  15
  16 PREVIEW_SIZE = (216, 300)
  17
  18
  19 def preview(request, book, chunk=None, rev=None):
  20     """Creates a cover image.
  21
  22     If chunk and rev number are given, use version from given revision.
  23     If rev is not given, use publishable version.
  24     """
  25     from PIL import Image
  26     from librarian.cover import make_cover
  27     from librarian.dcparser import BookInfo
  28
  29     chunk = Chunk.get(book, chunk)
  30     if rev is not None:
  31         try:
  32             revision = chunk.at_revision(rev)
  33         except Chunk.change_model.DoesNotExist:
  34             raise Http404
  35     else:
  36         revision = chunk.publishable()
  37         if revision is None:
  38             revision = chunk.head
  39     xml = revision.materialize().encode('utf-8')
  40
  41     try:
  42         info = BookInfo.from_bytes(xml)
  43     except:
  44         return HttpResponseRedirect(os.path.join(settings.STATIC_URL, "img/sample_cover.png"))
  45     cover = make_cover(info)
  46     response = HttpResponse(content_type=cover.mime_type())
  47     img = cover.image().resize(PREVIEW_SIZE, Image.ANTIALIAS)
  48     img.save(response, cover.format)
  49     return response
  50
  51
  52 @csrf_exempt
  53 @require_POST
  54 def preview_from_xml(request):
  55     from hashlib import sha1
  56     from PIL import Image
  57     from os import makedirs
  58     from lxml import etree
  59     from librarian.cover import make_cover
  60     from librarian.dcparser import BookInfo
  61
  62     xml = request.POST['xml']
  63     try:
  64         info = BookInfo.from_bytes(xml.encode('utf-8'))
  65     except:
  66         return HttpResponse(os.path.join(settings.STATIC_URL, "img/sample_cover.png"))
  67     coverid = sha1(etree.tostring(info.to_etree())).hexdigest()
  68     cover = make_cover(info)
  69
  70     cover_dir = 'cover/preview'
  71     try:
  72         makedirs(os.path.join(settings.MEDIA_ROOT, cover_dir))
  73     except OSError:
  74         pass
  75     fname = os.path.join(cover_dir, "%s.%s" % (coverid, cover.ext()))
  76     img = cover.image().resize(PREVIEW_SIZE, Image.ANTIALIAS)
  77     img.save(os.path.join(settings.MEDIA_ROOT, fname))
  78     return HttpResponse(os.path.join(settings.MEDIA_URL, fname))
  79
  80
  81 @active_tab('cover')
  82 def image(request, pk):
  83     img = get_object_or_404(Image, pk=pk)
  84
  85     if request.user.has_perm('cover.change_image'):
  86         if request.method == "POST":
  87             form = forms.ImageEditForm(request.POST, request.FILES, instance=img)
  88             if form.is_valid():
  89                 form.save()
  90                 return HttpResponseRedirect(img.get_absolute_url())
  91         else:
  92             form = forms.ImageEditForm(instance=img)
  93         editable = True
  94     else:
  95         form = forms.ReadonlyImageEditForm(instance=img)
  96         editable = False
  97
  98     return render(request, "cover/image_detail.html", {
  99         "object": Image.objects.get(id=img.id),
 100         "form": form,
 101         "editable": editable,
 102     })
 103
 104
 105 def image_file(request, pk):
 106     img = get_object_or_404(Image, pk=pk)
 107     return HttpResponseRedirect(img.file.url)
 108
 109
 110 @active_tab('cover')
 111 def image_list(request):
 112     return render(request, "cover/image_list.html", {
 113         'object_list': Image.objects.all(),
 114         'can_add': request.user.has_perm('cover.add_image'),
 115     })
 116
 117
 118 @permission_required('cover.add_image')
 119 @active_tab('cover')
 120 def add_image(request):
 121     form = ff = None
 122     if request.method == 'POST':
 123         if request.POST.get('form_id') == 'flickr':
 124             ff = forms.FlickrForm(request.POST)
 125             if ff.is_valid():
 126                 form = forms.ImageAddForm(ff.cleaned_data)
 127         else:
 128             form = forms.ImageAddForm(request.POST, request.FILES)
 129             if form.is_valid():
 130                 obj = form.save()
 131                 return HttpResponseRedirect(obj.get_absolute_url())
 132     if form is None:
 133         form = forms.ImageAddForm()
 134     if ff is None:
 135         ff = forms.FlickrForm()
 136     return render(request, 'cover/add_image.html', {
 137             'form': form,
 138             'ff': ff,
 139         })