+
+class EbookFieldFile(FieldFile):
+ """Represents contents of an ebook file field."""
+
+ def build(self):
+ """Build the ebook immediately."""
+ return self.field.builder.build(self)
+
+ def build_delay(self):
+ """Builds the ebook in a delayed task."""
+ return self.field.builder.delay(self.instance, self.field.attname)
+
+
+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
+
+ def deconstruct(self):
+ name, path, args, kwargs = super(EbookField, self).deconstruct()
+ args.insert(0, self.format_name)
+ return name, path, args, kwargs
+
+ @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__ = str("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, obj, field_name):
+ """Just run `build` on FieldFile, can't pass it directly to Celery."""
+ return self.build(getattr(obj, field_name))
+
+ def build(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,
+ cover=True)
+
+ def build(self, fieldfile):
+ BuildEbook.build(self, fieldfile)
+ clear_cache(fieldfile.instance.slug)
+
+
+@BuildEbook.register('epub')
+@task(ignore_result=True)
+class BuildEpub(BuildEbook):
+ @staticmethod
+ def transform(wldoc, fieldfile):
+ return wldoc.as_epub(cover=True)
+
+
+@BuildEbook.register('html')
+@task(ignore_result=True)
+class BuildHtml(BuildEbook):
+ def build(self, fieldfile):
+ from django.core.files.base import ContentFile
+ from fnpdjango.utils.text.slughifi import slughifi
+ from sortify import sortify
+ from librarian import html
+ from catalogue.models import Fragment, Tag
+
+ book = fieldfile.instance
+
+ html_output = self.transform(
+ book.wldocument(parse_dublincore=False),
+ fieldfile)
+
+ # Delete old fragments, create from scratch if necessary.
+ book.fragments.all().delete()
+
+ if html_output:
+ meta_tags = list(book.tags.filter(
+ category__in=('author', 'epoch', 'genre', 'kind')))
+
+ lang = book.language
+ lang = LANGUAGES_3TO2.get(lang, lang)
+ if lang not in [ln[0] for ln in settings.LANGUAGES]:
+ lang = None
+
+ fieldfile.save(None, ContentFile(html_output.get_string()),
+ save=False)
+ type(book).objects.filter(pk=book.pk).update(**{
+ fieldfile.field.attname: fieldfile
+ })
+
+ # 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
+ if lang == settings.LANGUAGE_CODE:
+ # Allow creating themes if book in default language.
+ tag, created = Tag.objects.get_or_create(
+ slug=slughifi(theme_name),
+ category='theme')
+ if created:
+ tag.name = theme_name
+ setattr(tag, "name_%s" % lang, theme_name)
+ tag.sort_key = sortify(theme_name.lower())
+ tag.save()
+ themes.append(tag)
+ elif lang is not None:
+ # Don't create unknown themes in non-default languages.
+ try:
+ tag = Tag.objects.get(category='theme',
+ **{"name_%s" % lang: theme_name})
+ except Tag.DoesNotExist:
+ pass
+ else:
+ 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.html_built.send(sender=type(self), instance=book)
+ return True
+ return False
+
+@BuildEbook.register('cover_thumb')
+@task(ignore_result=True)
+class BuildCoverThumb(BuildEbook):
+ @classmethod
+ def transform(cls, wldoc, fieldfile):
+ from librarian.cover import WLCover
+ return WLCover(wldoc.book_info, height=193).output_file()
+
+
+
+class OverwritingFieldFile(FieldFile):
+ """
+ Deletes the old file before saving the new one.
+ """
+
+ def save(self, name, content, *args, **kwargs):
+ leave = kwargs.pop('leave', None)
+ # delete if there's a file already and there's a new one coming
+ if not leave and self and (not hasattr(content, 'path') or
+ content.path != self.path):
+ self.delete(save=False)
+ return super(OverwritingFieldFile, self).save(
+ name, content, *args, **kwargs)
+
+
+class OverwritingFileField(models.FileField):
+ attr_class = OverwritingFieldFile
fnp / wolnelektury.git / blobdiff