# This file is part of Wolnelektury, licensed under GNU Affero GPLv3 or later.
# Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information.
#
+from django.conf import settings
+from django.core.files import File
from django.db import models
from django.db.models.fields.files import FieldFile
+from catalogue import app_settings
+from catalogue.utils import remove_zip, truncate_html_words
+from celery import Task
+from celery.task import task
+from waiter.utils import clear_cache
+
+
+class EbookFieldFile(FieldFile):
+ """Represents contents of an ebook file field."""
+
+ def build(self):
+ """Build the ebook immediately."""
+ return self.field.builder(self)
+
+ def build_delay(self):
+ """Builds the ebook in a delayed task."""
+ return self.field.builder.delay(self)
+
+
+class EbookField(models.FileField):
+ """Represents an ebook file field, attachable to a model."""
+ attr_class = EbookFieldFile
+
+ def __init__(self, format_name, *args, **kwargs):
+ super(EbookField, self).__init__(*args, **kwargs)
+ self.format_name = format_name
+
+ @property
+ def builder(self):
+ """Finds a celery task suitable for the format of the field."""
+ return BuildEbook.for_format(self.format_name)
+
+ def contribute_to_class(self, cls, name):
+ super(EbookField, self).contribute_to_class(cls, name)
+
+ def has(model_instance):
+ return bool(getattr(model_instance, self.attname, None))
+ has.__doc__ = None
+ has.__name__ = "has_%s" % self.attname
+ has.short_description = self.name
+ has.boolean = True
+ setattr(cls, 'has_%s' % self.attname, has)
+
+
+class BuildEbook(Task):
+ formats = {}
+
+ @classmethod
+ def register(cls, format_name):
+ """A decorator for registering subclasses for particular formats."""
+ def wrapper(builder):
+ cls.formats[format_name] = builder
+ return builder
+ return wrapper
+
+ @classmethod
+ def for_format(cls, format_name):
+ """Returns a celery task suitable for specified format."""
+ return cls.formats.get(format_name, BuildEbookTask)
+
+ @staticmethod
+ def transform(wldoc, fieldfile):
+ """Transforms an librarian.WLDocument into an librarian.OutputFile.
+
+ By default, it just calls relevant wldoc.as_??? method.
+
+ """
+ return getattr(wldoc, "as_%s" % fieldfile.field.format_name)()
+
+ def run(self, fieldfile):
+ book = fieldfile.instance
+ out = self.transform(book.wldocument(), fieldfile)
+ fieldfile.save(None, File(open(out.get_filename())), save=False)
+ if book.pk is not None:
+ type(book).objects.filter(pk=book.pk).update(**{
+ fieldfile.field.attname: fieldfile
+ })
+ if fieldfile.field.format_name in app_settings.FORMAT_ZIPS:
+ remove_zip(app_settings.FORMAT_ZIPS[fieldfile.field.format_name])
+# Don't decorate BuildEbook, because we want to subclass it.
+BuildEbookTask = task(BuildEbook, ignore_result=True)
+
+
+@BuildEbook.register('txt')
+@task(ignore_result=True)
+class BuildTxt(BuildEbook):
+ @staticmethod
+ def transform(wldoc, fieldfile):
+ return wldoc.as_text()
+
+
+@BuildEbook.register('pdf')
+@task(ignore_result=True)
+class BuildPdf(BuildEbook):
+ @staticmethod
+ def transform(wldoc, fieldfile):
+ return wldoc.as_pdf(morefloats=settings.LIBRARIAN_PDF_MOREFLOATS)
+
+ def run(self, fieldfile):
+ BuildEbook.run(self, fieldfile)
+ clear_cache(fieldfile.instance.slug)
+
+
+@BuildEbook.register('html')
+@task(ignore_result=True)
+class BuildHtml(BuildEbook):
+ def run(self, fieldfile):
+ from django.core.files.base import ContentFile
+ from slughifi import slughifi
+ from sortify import sortify
+ from librarian import html
+ from catalogue.models import Fragment, Tag
+
+ book = fieldfile.instance
+
+ meta_tags = list(book.tags.filter(
+ category__in=('author', 'epoch', 'genre', 'kind')))
+ book_tag = book.book_tag()
+
+ html_output = self.transform(
+ book.wldocument(parse_dublincore=False),
+ fieldfile)
+ if html_output:
+ fieldfile.save(None, ContentFile(html_output.get_string()),
+ save=False)
+ type(book).objects.filter(pk=book.pk).update(**{
+ fieldfile.field.attname: fieldfile
+ })
+
+ # get ancestor l-tags for adding to new fragments
+ ancestor_tags = []
+ p = book.parent
+ while p:
+ ancestor_tags.append(p.book_tag())
+ p = p.parent
+
+ # Delete old fragments and create them from scratch
+ book.fragments.all().delete()
+ # Extract fragments
+ closed_fragments, open_fragments = html.extract_fragments(fieldfile.path)
+ for fragment in closed_fragments.values():
+ try:
+ theme_names = [s.strip() for s in fragment.themes.split(',')]
+ except AttributeError:
+ continue
+ themes = []
+ for theme_name in theme_names:
+ if not theme_name:
+ continue
+ tag, created = Tag.objects.get_or_create(
+ slug=slughifi(theme_name),
+ category='theme')
+ if created:
+ tag.name = theme_name
+ tag.sort_key = sortify(theme_name.lower())
+ tag.save()
+ themes.append(tag)
+ if not themes:
+ continue
+
+ text = fragment.to_string()
+ short_text = truncate_html_words(text, 15)
+ if text == short_text:
+ short_text = ''
+ new_fragment = Fragment.objects.create(anchor=fragment.id,
+ book=book, text=text, short_text=short_text)
+
+ new_fragment.save()
+ new_fragment.tags = set(meta_tags + themes + [book_tag] + ancestor_tags)
+ book.html_built.send(sender=book)
+ return True
+ return False
class OverwritingFieldFile(FieldFile):
try:
# check for south
from south.modelsinspector import add_introspection_rules
-
- add_introspection_rules([], ["^catalogue\.fields\.OverwritingFileField"])
except ImportError:
pass
+else:
+ add_introspection_rules([
+ (
+ [EbookField],
+ [],
+ {'format_name': ('format_name', {})}
+ )
+ ], ["^catalogue\.fields\.EbookField"])
+ add_introspection_rules([], ["^catalogue\.fields\.OverwritingFileField"])
fnp / wolnelektury.git / blobdiff