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 from hashlib import sha1
   5 from os import makedirs
   6 import os.path
   7 import PIL.Image
   8 from django.conf import settings
   9 from django.contrib.auth.decorators import permission_required
  10 from django.http import HttpResponse, HttpResponseRedirect, Http404
  11 from django.shortcuts import get_object_or_404, render
  12 from django.views.decorators.csrf import csrf_exempt
  13 from django.views.decorators.http import require_POST
  14 from lxml import etree
  15 from librarian import RDFNS, DCNS
  16 from librarian.cover import make_cover
  17 from librarian.dcparser import BookInfo
  18 from documents.helpers import active_tab
  19 from documents.models import Book, Chunk
  20 from cover.models import Image
  21 from cover import forms
  22 from cover.utils import get_import_data
  23
  24
  25 PREVIEW_SIZE = (216, 300)
  26
  27
  28 def preview(request, book, chunk=None, rev=None):
  29     """Creates a cover image.
  30
  31     If chunk and rev number are given, use version from given revision.
  32     If rev is not given, use publishable version.
  33     """
  34     chunk = Chunk.get(book, chunk)
  35
  36     if chunk.book.cover and rev is None and not request.GET.get('width') and not request.GET.get('height'):
  37         return HttpResponseRedirect(chunk.book.cover.url)
  38
  39     if rev is not None:
  40         try:
  41             revision = chunk.at_revision(rev)
  42         except Chunk.change_model.DoesNotExist:
  43             raise Http404
  44     else:
  45         revision = chunk.publishable()
  46         if revision is None:
  47             revision = chunk.head
  48     xml = revision.materialize().encode('utf-8')
  49
  50     try:
  51         info = BookInfo.from_bytes(xml)
  52     except Exception as e:
  53         print(e)
  54         return HttpResponseRedirect(os.path.join(settings.STATIC_URL, "img/sample_cover.png"))
  55     width = request.GET.get('width')
  56     width = int(width) if width else None
  57     height=request.GET.get('height')
  58     height = int(height) if height else None
  59
  60     if not (height or width):
  61         width, height = PREVIEW_SIZE
  62
  63     cover_class = request.GET.get('cover_class', 'default')
  64
  65     cover = make_cover(info, cover_class=cover_class, width=width, height=height)
  66     response = HttpResponse(content_type=cover.mime_type())
  67     img = cover.final_image()
  68     img.save(response, cover.format)
  69
  70     if 'download' in request.GET:
  71         response['Content-Disposition'] = 'attachment; filename=%s.jpg' % chunk.book.slug
  72
  73     return response
  74
  75
  76 @csrf_exempt
  77 @require_POST
  78 def preview_from_xml(request):
  79     xml = request.POST['xml']
  80     try:
  81         info = BookInfo.from_bytes(xml.encode('utf-8'))
  82     except Exception as e:
  83         print(e)
  84         return HttpResponse(os.path.join(settings.STATIC_URL, "img/sample_cover.png"))
  85     coverid = sha1(etree.tostring(info.to_etree())).hexdigest()
  86     cover = make_cover(info)
  87
  88     cover_dir = 'cover/preview'
  89     try:
  90         makedirs(os.path.join(settings.MEDIA_ROOT, cover_dir))
  91     except OSError:
  92         pass
  93     fname = os.path.join(cover_dir, "%s.%s" % (coverid, cover.ext()))
  94     img = cover.image().resize(PREVIEW_SIZE, PIL.Image.ANTIALIAS)
  95     img.save(os.path.join(settings.MEDIA_ROOT, fname))
  96     return HttpResponse(os.path.join(settings.MEDIA_URL, fname))
  97
  98
  99 @active_tab('cover')
 100 def image(request, pk):
 101     img = get_object_or_404(Image, pk=pk)
 102
 103     if request.user.has_perm('cover.change_image'):
 104         if request.method == "POST":
 105             form = forms.ImageEditForm(request.POST, request.FILES, instance=img)
 106             if form.is_valid():
 107                 form.save()
 108                 return HttpResponseRedirect(img.get_absolute_url())
 109         else:
 110             form = forms.ImageEditForm(instance=img)
 111         editable = True
 112     else:
 113         form = forms.ReadonlyImageEditForm(instance=img)
 114         editable = False
 115
 116     return render(request, "cover/image_detail.html", {
 117         "object": Image.objects.get(id=img.id),
 118         "form": form,
 119         "editable": editable,
 120     })
 121
 122
 123 def image_file(request, pk):
 124     img = get_object_or_404(Image, pk=pk)
 125     return HttpResponseRedirect(img.file.url)
 126
 127
 128 @active_tab('cover')
 129 def image_list(request):
 130     return render(request, "cover/image_list.html", {
 131         'object_list': Image.objects.all().order_by('-id'),
 132         'can_add': request.user.has_perm('cover.add_image'),
 133     })
 134
 135
 136 @permission_required('cover.add_image')
 137 @active_tab('cover')
 138 def add_image(request):
 139     form = ff = None
 140     if request.method == 'POST':
 141         if request.POST.get('form_id') == 'import':
 142             ff = forms.ImportForm(request.POST)
 143             if ff.is_valid():
 144                 form = forms.ImageAddForm(ff.cleaned_data)
 145         else:
 146             form = forms.ImageAddForm(request.POST, request.FILES)
 147             if form.is_valid():
 148                 obj = form.save()
 149                 return HttpResponseRedirect(obj.get_absolute_url())
 150     if form is None:
 151         form = forms.ImageAddForm()
 152     if ff is None:
 153         ff = forms.ImportForm()
 154     return render(request, 'cover/add_image.html', {
 155             'form': form,
 156             'ff': ff,
 157         })
 158
 159 @permission_required('cover.add_image')
 160 def quick_import(request, pk):
 161     url = request.POST.get('url')
 162     if url.startswith('%s://%s/' % (
 163             request.scheme,
 164             request.get_host())):
 165         cover_id = url.rstrip('/').rsplit('/', 1)[-1]
 166         cover = Image.objects.get(pk=cover_id)
 167     else:
 168         data = get_import_data(url)
 169         same = Image.objects.filter(source_url=data['source_url'])
 170         if not same.exists():
 171             same = Image.objects.filter(download_url=data['download_url'])
 172         if same.exists():
 173             cover = same.first()
 174         else:
 175             form = forms.ImageAddForm(data)
 176             if form.is_valid():
 177                 cover = form.save()
 178
 179     # We have a cover. Now let's commit.
 180     book = Book.objects.get(pk=pk)
 181     chunk = book[0]
 182     text = chunk.head.materialize()
 183
 184     root = etree.fromstring(text)
 185     rdf = root.find('.//' + RDFNS('Description'))
 186     for tag in 'url', 'attribution', 'source':
 187         for elem in rdf.findall('.//' + DCNS('relation.coverImage.%s' % tag)):
 188             rdf.remove(elem)
 189     e = etree.Element(DCNS('relation.coverImage.url'))
 190     e.text = request.build_absolute_uri(cover.use_file.url)
 191     rdf.append(e)
 192     e.tail = '\n    '
 193     e = etree.Element(DCNS('relation.coverImage.attribution'))
 194     e.text = ''
 195     if cover.title:
 196         e.text += cover.title + ', '
 197     if cover.author:
 198         e.text += cover.author + ', '
 199     e.text += cover.license_name
 200     e.tail = '\n    '
 201     rdf.append(e)
 202     e = etree.Element(DCNS('relation.coverImage.source'))
 203     e.text = cover.get_full_url()
 204     e.tail = '\n    '
 205     rdf.append(e)
 206
 207     xml = etree.tostring(root, encoding='unicode')
 208     chunk.commit(
 209         xml,
 210         author=request.user,
 211         comment='Cover',
 212         publishable=chunk.head.publishable,
 213     )
 214     return HttpResponseRedirect(book.get_absolute_url())
 215