def preview_from_xml(request):
from hashlib import sha1
from PIL import Image
from os import makedirs
from lxml import etree
from librarian.cover import make_cover
from librarian.dcparser import BookInfo
xml = request.POST['xml']
try:
info = BookInfo.from_bytes(xml.encode('utf-8'))
except:
return HttpResponse(os.path.join(settings.STATIC_URL, "img/sample_cover.png"))
coverid = sha1(etree.tostring(info.to_etree())).hexdigest()
cover = make_cover(info)
cover_dir = 'cover/preview'
try:
makedirs(os.path.join(settings.MEDIA_ROOT, cover_dir))
except OSError:
pass
fname = os.path.join(cover_dir, "%s.%s" % (coverid, cover.ext()))
img = cover.image().resize(PREVIEW_SIZE, Image.ANTIALIAS)
img.save(os.path.join(settings.MEDIA_ROOT, fname))
return HttpResponse(os.path.join(settings.MEDIA_URL, fname))
def preview(request, book, chunk=None, rev=None):
"""Creates a cover image.
If chunk and rev number are given, use version from given revision.
If rev is not given, use publishable version.
"""
from PIL import Image
from librarian.cover import make_cover
from librarian.dcparser import BookInfo
chunk = Chunk.get(book, chunk)
if rev is not None:
try:
revision = chunk.at_revision(rev)
except Chunk.change_model.DoesNotExist:
raise Http404
else:
revision = chunk.publishable()
if revision is None:
raise Http404
xml = revision.materialize().encode('utf-8')
try:
info = BookInfo.from_bytes(xml)
except:
return HttpResponseRedirect(os.path.join(settings.STATIC_URL, "img/sample_cover.png"))
cover = make_cover(info)
response = HttpResponse(content_type=cover.mime_type())
img = cover.image().resize(PREVIEW_SIZE, Image.ANTIALIAS)
img.save(response, cover.format)
return response
def book_info(self, publishable=True):
try:
book_xml = self.materialize(publishable=publishable)
except self.NoTextError:
pass
else:
from librarian.dcparser import BookInfo
from librarian import NoDublinCore, ParseError, ValidationError
try:
return BookInfo.from_bytes(book_xml.encode('utf-8'))
except (self.NoTextError, ParseError, NoDublinCore, ValidationError):
return None