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     try:
  35         chunk = Chunk.get(book, chunk)
  36     except Chunk.DoesNotExist:
  37         raise Http404
  38
  39     if chunk.book.cover and rev is None and not request.GET.get('width') and not request.GET.get('height'):
  40         return HttpResponseRedirect(chunk.book.cover.url)
  41
  42     if rev is not None:
  43         try:
  44             revision = chunk.at_revision(rev)
  45         except Chunk.change_model.DoesNotExist:
  46             raise Http404
  47     else:
  48         revision = chunk.publishable()
  49         if revision is None:
  50             revision = chunk.head
  51     xml = revision.materialize().encode('utf-8')
  52
  53     try:
  54         info = BookInfo.from_bytes(xml)
  55     except Exception as e:
  56         print(e)
  57         return HttpResponseRedirect(os.path.join(settings.STATIC_URL, "img/sample_cover.png"))
  58     width = request.GET.get('width')
  59     width = int(width) if width else None
  60     height=request.GET.get('height')
  61     height = int(height) if height else None
  62
  63     if not (height or width):
  64         width, height = PREVIEW_SIZE
  65
  66     cover_class = request.GET.get('cover_class', 'default')
  67
  68     cover = make_cover(info, cover_class=cover_class, width=width, height=height)
  69     response = HttpResponse(content_type=cover.mime_type())
  70     img = cover.final_image()
  71     img.save(response, cover.format)
  72
  73     if 'download' in request.GET:
  74         response['Content-Disposition'] = 'attachment; filename=%s.jpg' % chunk.book.slug
  75
  76     return response
  77
  78
  79 @csrf_exempt
  80 @require_POST
  81 def preview_from_xml(request):
  82     xml = request.POST['xml']
  83     try:
  84         info = BookInfo.from_bytes(xml.encode('utf-8'))
  85     except Exception as e:
  86         print(e)
  87         return HttpResponse(os.path.join(settings.STATIC_URL, "img/sample_cover.png"))
  88     coverid = sha1(etree.tostring(info.to_etree())).hexdigest()
  89     cover = make_cover(info)
  90
  91     cover_dir = 'cover/preview'
  92     try:
  93         makedirs(os.path.join(settings.MEDIA_ROOT, cover_dir))
  94     except OSError:
  95         pass
  96     fname = os.path.join(cover_dir, "%s.%s" % (coverid, cover.ext()))
  97     img = cover.image().resize(PREVIEW_SIZE, PIL.Image.ANTIALIAS)
  98     img.save(os.path.join(settings.MEDIA_ROOT, fname))
  99     return HttpResponse(os.path.join(settings.MEDIA_URL, fname))
 100
 101
 102 @active_tab('cover')
 103 def image(request, pk):
 104     img = get_object_or_404(Image, pk=pk)
 105
 106     if request.user.has_perm('cover.change_image'):
 107         if request.method == "POST":
 108             form = forms.ImageEditForm(request.POST, request.FILES, instance=img)
 109             if form.is_valid():
 110                 form.save()
 111                 return HttpResponseRedirect(img.get_absolute_url())
 112         else:
 113             form = forms.ImageEditForm(instance=img)
 114         editable = True
 115     else:
 116         form = forms.ReadonlyImageEditForm(instance=img)
 117         editable = False
 118
 119     return render(request, "cover/image_detail.html", {
 120         "object": Image.objects.get(id=img.id),
 121         "form": form,
 122         "editable": editable,
 123     })
 124
 125
 126 def image_file(request, pk):
 127     img = get_object_or_404(Image, pk=pk)
 128     return HttpResponseRedirect(img.file.url)
 129
 130
 131 @active_tab('cover')
 132 def image_list(request):
 133     return render(request, "cover/image_list.html", {
 134         'object_list': Image.objects.all().order_by('-id'),
 135         'can_add': request.user.has_perm('cover.add_image'),
 136     })
 137
 138
 139 @permission_required('cover.add_image')
 140 @active_tab('cover')
 141 def add_image(request):
 142     form = ff = None
 143     if request.method == 'POST':
 144         if request.POST.get('form_id') == 'import':
 145             ff = forms.ImportForm(request.POST)
 146             if ff.is_valid():
 147                 form = forms.ImageAddForm(ff.cleaned_data)
 148         else:
 149             form = forms.ImageAddForm(request.POST, request.FILES)
 150             if form.is_valid():
 151                 obj = form.save()
 152                 return HttpResponseRedirect(obj.get_absolute_url())
 153     if form is None:
 154         form = forms.ImageAddForm()
 155     if ff is None:
 156         ff = forms.ImportForm()
 157     return render(request, 'cover/add_image.html', {
 158             'form': form,
 159             'ff': ff,
 160         })
 161
 162 @permission_required('cover.add_image')
 163 def quick_import(request, pk):
 164     url = request.POST.get('url')
 165     if url.startswith('%s://%s/' % (
 166             request.scheme,
 167             request.get_host())):
 168         cover_id = url.rstrip('/').rsplit('/', 1)[-1]
 169         cover = Image.objects.get(pk=cover_id)
 170     else:
 171         data = get_import_data(url)
 172         same = Image.objects.filter(source_url=data['source_url'])
 173         if not same.exists():
 174             same = Image.objects.filter(download_url=data['download_url'])
 175         if same.exists():
 176             cover = same.first()
 177         else:
 178             form = forms.ImageAddForm(data)
 179             if form.is_valid():
 180                 cover = form.save()
 181
 182     # We have a cover. Now let's commit.
 183     book = Book.objects.get(pk=pk)
 184     chunk = book[0]
 185     text = chunk.head.materialize()
 186
 187     root = etree.fromstring(text)
 188     rdf = root.find('.//' + RDFNS('Description'))
 189     for tag in 'url', 'attribution', 'source':
 190         for elem in rdf.findall('.//' + DCNS('relation.coverImage.%s' % tag)):
 191             rdf.remove(elem)
 192     e = etree.Element(DCNS('relation.coverImage.url'))
 193     e.text = request.build_absolute_uri(cover.use_file.url)
 194     rdf.append(e)
 195     e.tail = '\n    '
 196     e = etree.Element(DCNS('relation.coverImage.attribution'))
 197     e.text = ''
 198     if cover.title:
 199         e.text += cover.title + ', '
 200     if cover.author:
 201         e.text += cover.author + ', '
 202     e.text += cover.license_name
 203     e.tail = '\n    '
 204     rdf.append(e)
 205     e = etree.Element(DCNS('relation.coverImage.source'))
 206     e.text = cover.get_full_url()
 207     e.tail = '\n    '
 208     rdf.append(e)
 209
 210     xml = etree.tostring(root, encoding='unicode')
 211     chunk.commit(
 212         xml,
 213         author=request.user,
 214         comment='Cover',
 215         publishable=chunk.head.publishable,
 216     )
 217     return HttpResponseRedirect(book.get_absolute_url())
 218