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, JsonResponse
  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 = (212, 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 not request.accepts('text/html') and request.accepts('application/json') or request.GET.get('format') == 'json':
 107         return JsonResponse({
 108             'attribution': img.attribution,
 109             'cut_left': img.cut_left,
 110             'cut_right': img.cut_right,
 111             'cut_top': img.cut_top,
 112             'cut_bottom': img.cut_bottom,
 113             'file': img.file.url,
 114             'use_file': img.use_file.url,
 115         })
 116
 117     if request.user.has_perm('cover.change_image'):
 118         if request.method == "POST":
 119             form = forms.ImageEditForm(request.POST, request.FILES, instance=img)
 120             if form.is_valid():
 121                 form.save()
 122                 return HttpResponseRedirect(img.get_absolute_url())
 123         else:
 124             form = forms.ImageEditForm(instance=img)
 125         editable = True
 126     else:
 127         form = forms.ReadonlyImageEditForm(instance=img)
 128         editable = False
 129
 130     return render(request, "cover/image_detail.html", {
 131         "object": Image.objects.get(id=img.id),
 132         "form": form,
 133         "editable": editable,
 134     })
 135
 136
 137 def image_file(request, pk):
 138     img = get_object_or_404(Image, pk=pk)
 139     return HttpResponseRedirect(img.file.url)
 140
 141
 142 @active_tab('cover')
 143 def image_list(request):
 144     return render(request, "cover/image_list.html", {
 145         'object_list': Image.objects.all().order_by('-id'),
 146         'can_add': request.user.has_perm('cover.add_image'),
 147     })
 148
 149
 150 @permission_required('cover.add_image')
 151 @active_tab('cover')
 152 def add_image(request):
 153     form = ff = None
 154     if request.method == 'POST':
 155         if request.POST.get('form_id') == 'import':
 156             ff = forms.ImportForm(request.POST)
 157             if ff.is_valid():
 158                 form = forms.ImageAddForm(ff.cleaned_data)
 159         else:
 160             form = forms.ImageAddForm(request.POST, request.FILES)
 161             if form.is_valid():
 162                 obj = form.save()
 163                 return HttpResponseRedirect(obj.get_absolute_url())
 164     if form is None:
 165         form = forms.ImageAddForm()
 166     if ff is None:
 167         ff = forms.ImportForm()
 168     return render(request, 'cover/add_image.html', {
 169             'form': form,
 170             'ff': ff,
 171         })
 172
 173 @permission_required('cover.add_image')
 174 def quick_import(request, pk):
 175     url = request.POST.get('url')
 176     if url.startswith('%s://%s/' % (
 177             request.scheme,
 178             request.get_host())):
 179         cover_id = url.rstrip('/').rsplit('/', 1)[-1]
 180         cover = Image.objects.get(pk=cover_id)
 181     else:
 182         data = get_import_data(url)
 183         same = Image.objects.filter(source_url=data['source_url'])
 184         if not same.exists():
 185             same = Image.objects.filter(download_url=data['download_url'])
 186         if same.exists():
 187             cover = same.first()
 188         else:
 189             form = forms.ImageAddForm(data)
 190             if form.is_valid():
 191                 cover = form.save()
 192
 193     # We have a cover. Now let's commit.
 194     book = Book.objects.get(pk=pk)
 195     chunk = book[0]
 196     text = chunk.head.materialize()
 197
 198     root = etree.fromstring(text)
 199     rdf = root.find('.//' + RDFNS('Description'))
 200     for tag in 'url', 'attribution', 'source':
 201         for elem in rdf.findall('.//' + DCNS('relation.coverImage.%s' % tag)):
 202             rdf.remove(elem)
 203     e = etree.Element(DCNS('relation.coverImage.url'))
 204     e.text = request.build_absolute_uri(cover.use_file.url)
 205     rdf.append(e)
 206     e.tail = '\n    '
 207     e = etree.Element(DCNS('relation.coverImage.attribution'))
 208     e.text = ''
 209     if cover.title:
 210         e.text += cover.title + ', '
 211     if cover.author:
 212         e.text += cover.author + ', '
 213     e.text += cover.license_name
 214     e.tail = '\n    '
 215     rdf.append(e)
 216     e = etree.Element(DCNS('relation.coverImage.source'))
 217     e.text = cover.get_full_url()
 218     e.tail = '\n    '
 219     rdf.append(e)
 220
 221     xml = etree.tostring(root, encoding='unicode')
 222     chunk.commit(
 223         xml,
 224         author=request.user,
 225         comment='Cover',
 226         publishable=chunk.head.publishable,
 227     )
 228     return HttpResponseRedirect(book.get_absolute_url())
 229