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     width = request.GET.get('width')
  46     width = int(width) if width else None
  47     height=request.GET.get('height')
  48     height = int(height) if height else None
  49     cover = make_cover(info, width=width, height=height)
  50     #cover = make_cover(info)
  51     response = HttpResponse(content_type=cover.mime_type())
  52     if height or width:
  53         size = (width, height)
  54     else:
  55         size = PREVIEW_SIZE
  56     img = cover.image().resize(size, Image.ANTIALIAS)
  57     img.save(response, cover.format)
  58
  59     if 'download' in request.GET:
  60         response['Content-Disposition'] = 'attachment; filename=%s.jpg' % chunk.book.slug
  61
  62     return response
  63
  64
  65 @csrf_exempt
  66 @require_POST
  67 def preview_from_xml(request):
  68     from hashlib import sha1
  69     from PIL import Image
  70     from os import makedirs
  71     from lxml import etree
  72     from librarian.cover import make_cover
  73     from librarian.dcparser import BookInfo
  74
  75     xml = request.POST['xml']
  76     try:
  77         info = BookInfo.from_bytes(xml.encode('utf-8'))
  78     except:
  79         return HttpResponse(os.path.join(settings.STATIC_URL, "img/sample_cover.png"))
  80     coverid = sha1(etree.tostring(info.to_etree())).hexdigest()
  81     cover = make_cover(info)
  82
  83     cover_dir = 'cover/preview'
  84     try:
  85         makedirs(os.path.join(settings.MEDIA_ROOT, cover_dir))
  86     except OSError:
  87         pass
  88     fname = os.path.join(cover_dir, "%s.%s" % (coverid, cover.ext()))
  89     img = cover.image().resize(PREVIEW_SIZE, Image.ANTIALIAS)
  90     img.save(os.path.join(settings.MEDIA_ROOT, fname))
  91     return HttpResponse(os.path.join(settings.MEDIA_URL, fname))
  92
  93
  94 @active_tab('cover')
  95 def image(request, pk):
  96     img = get_object_or_404(Image, pk=pk)
  97
  98     if request.user.has_perm('cover.change_image'):
  99         if request.method == "POST":
 100             form = forms.ImageEditForm(request.POST, request.FILES, instance=img)
 101             if form.is_valid():
 102                 form.save()
 103                 return HttpResponseRedirect(img.get_absolute_url())
 104         else:
 105             form = forms.ImageEditForm(instance=img)
 106         editable = True
 107     else:
 108         form = forms.ReadonlyImageEditForm(instance=img)
 109         editable = False
 110
 111     return render(request, "cover/image_detail.html", {
 112         "object": Image.objects.get(id=img.id),
 113         "form": form,
 114         "editable": editable,
 115     })
 116
 117
 118 def image_file(request, pk):
 119     img = get_object_or_404(Image, pk=pk)
 120     return HttpResponseRedirect(img.file.url)
 121
 122
 123 @active_tab('cover')
 124 def image_list(request):
 125     return render(request, "cover/image_list.html", {
 126         'object_list': Image.objects.all(),
 127         'can_add': request.user.has_perm('cover.add_image'),
 128     })
 129
 130
 131 @permission_required('cover.add_image')
 132 @active_tab('cover')
 133 def add_image(request):
 134     form = ff = None
 135     if request.method == 'POST':
 136         if request.POST.get('form_id') == 'flickr':
 137             ff = forms.FlickrForm(request.POST)
 138             if ff.is_valid():
 139                 form = forms.ImageAddForm(ff.cleaned_data)
 140         else:
 141             form = forms.ImageAddForm(request.POST, request.FILES)
 142             if form.is_valid():
 143                 obj = form.save()
 144                 return HttpResponseRedirect(obj.get_absolute_url())
 145     if form is None:
 146         form = forms.ImageAddForm()
 147     if ff is None:
 148         ff = forms.FlickrForm()
 149     return render(request, 'cover/add_image.html', {
 150             'form': form,
 151             'ff': ff,
 152         })