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
  19 PREVIEW_SIZE = (216, 300)
  20
  21
  22 def preview(request, book, chunk=None, rev=None):
  23     """Creates a cover image.
  24
  25     If chunk and rev number are given, use version from given revision.
  26     If rev is not given, use publishable version.
  27     """
  28     from PIL import Image
  29     from librarian.cover import DefaultEbookCover
  30     from librarian.dcparser import BookInfo
  31
  32     chunk = Chunk.get(book, chunk)
  33     if rev is not None:
  34         try:
  35             revision = chunk.at_revision(rev)
  36         except Chunk.change_model.DoesNotExist:
  37             raise Http404
  38     else:
  39         revision = chunk.publishable()
  40         if revision is None:
  41             raise Http404
  42     xml = revision.materialize().encode('utf-8')
  43
  44     try:
  45         info = BookInfo.from_string(xml)
  46     except:
  47         return HttpResponseRedirect(os.path.join(settings.STATIC_URL, "img/sample_cover.png"))
  48     cover = DefaultEbookCover(info)
  49     response = HttpResponse(mimetype=cover.mime_type())
  50     image = cover.image().resize(PREVIEW_SIZE, Image.ANTIALIAS)
  51     image.save(response, cover.format)
  52     return response
  53
  54
  55 @csrf_exempt
  56 @require_POST
  57 def preview_from_xml(request):
  58     from hashlib import sha1
  59     from PIL import Image
  60     from os import makedirs
  61     from lxml import etree
  62     from librarian.cover import DefaultEbookCover
  63     from librarian.dcparser import BookInfo
  64
  65     xml = request.POST['xml']
  66     try:
  67         info = BookInfo.from_string(xml.encode('utf-8'))
  68     except:
  69         return HttpResponse(os.path.join(settings.STATIC_URL, "img/sample_cover.png"))
  70     coverid = sha1(etree.tostring(info.to_etree())).hexdigest()
  71     cover = DefaultEbookCover(info)
  72
  73     cover_dir = 'cover/preview'
  74     try:
  75         makedirs(os.path.join(settings.MEDIA_ROOT, cover_dir))
  76     except OSError:
  77         pass
  78     fname = os.path.join(cover_dir, "%s.%s" % (coverid, cover.ext()))
  79     image = cover.image().resize(PREVIEW_SIZE, Image.ANTIALIAS)
  80     image.save(os.path.join(settings.MEDIA_ROOT, fname))
  81     return HttpResponse(os.path.join(settings.MEDIA_URL, fname))
  82
  83
  84 @active_tab('cover')
  85 def image(request, pk):
  86     image = get_object_or_404(Image, pk=pk)
  87
  88     if request.user.has_perm('cover.change_image'):
  89         if request.method == "POST":
  90             form = forms.ImageEditForm(request.POST, request.FILES, instance=image)
  91             if form.is_valid():
  92                 form.save()
  93                 return HttpResponseRedirect(image.get_absolute_url())
  94         else:
  95             form = forms.ImageEditForm(instance=image)
  96         editable = True
  97     else:
  98         form = forms.ReadonlyImageEditForm(instance=image)
  99         editable = False
 100
 101     return render(request, "cover/image_detail.html", {
 102         "object": image,
 103         "form": form,
 104         "editable": editable,
 105     })
 106
 107
 108 @active_tab('cover')
 109 def image_list(request):
 110     objects = Image.objects.all()
 111     enable_add = request.user.has_perm('cover.add_image')
 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         })