apps/catalogue/models.py

   1 # -*- coding: utf-8 -*-
   2 # This file is part of Wolnelektury, licensed under GNU Affero GPLv3 or later.
   3 # Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information.
   4 #
   5 from collections import namedtuple
   6
   7 from django.db import models
   8 from django.db.models import permalink
   9 import django.dispatch
  10 from django.core.cache import get_cache
  11 from django.utils.translation import ugettext_lazy as _
  12 from django.contrib.auth.models import User
  13 from django.template.loader import render_to_string
  14 from django.utils.datastructures import SortedDict
  15 from django.utils.safestring import mark_safe
  16 from django.utils.translation import get_language
  17 from django.core.urlresolvers import reverse
  18 from django.db.models.signals import post_save, pre_delete, post_delete
  19 import jsonfield
  20
  21 from django.conf import settings
  22
  23 from newtagging.models import TagBase, tags_updated
  24 from newtagging import managers
  25 from catalogue.fields import JSONField, OverwritingFileField
  26 from catalogue.utils import create_zip, split_tags, truncate_html_words
  27 from catalogue import tasks
  28 import re
  29
  30 import search
  31
  32 # Those are hard-coded here so that makemessages sees them.
  33 TAG_CATEGORIES = (
  34     ('author', _('author')),
  35     ('epoch', _('epoch')),
  36     ('kind', _('kind')),
  37     ('genre', _('genre')),
  38     ('theme', _('theme')),
  39     ('set', _('set')),
  40     ('book', _('book')),
  41 )
  42
  43
  44 permanent_cache = get_cache('permanent')
  45
  46
  47 class TagSubcategoryManager(models.Manager):
  48     def __init__(self, subcategory):
  49         super(TagSubcategoryManager, self).__init__()
  50         self.subcategory = subcategory
  51
  52     def get_query_set(self):
  53         return super(TagSubcategoryManager, self).get_query_set().filter(category=self.subcategory)
  54
  55
  56 class Tag(TagBase):
  57     name = models.CharField(_('name'), max_length=50, db_index=True)
  58     slug = models.SlugField(_('slug'), max_length=120, db_index=True)
  59     sort_key = models.CharField(_('sort key'), max_length=120, db_index=True)
  60     category = models.CharField(_('category'), max_length=50, blank=False, null=False,
  61         db_index=True, choices=TAG_CATEGORIES)
  62     description = models.TextField(_('description'), blank=True)
  63
  64     user = models.ForeignKey(User, blank=True, null=True)
  65     book_count = models.IntegerField(_('book count'), blank=True, null=True)
  66     gazeta_link = models.CharField(blank=True, max_length=240)
  67     wiki_link = models.CharField(blank=True, max_length=240)
  68
  69     created_at    = models.DateTimeField(_('creation date'), auto_now_add=True, db_index=True)
  70     changed_at    = models.DateTimeField(_('creation date'), auto_now=True, db_index=True)
  71
  72     class UrlDeprecationWarning(DeprecationWarning):
  73         pass
  74
  75     categories_rev = {
  76         'autor': 'author',
  77         'epoka': 'epoch',
  78         'rodzaj': 'kind',
  79         'gatunek': 'genre',
  80         'motyw': 'theme',
  81         'polka': 'set',
  82     }
  83     categories_dict = dict((item[::-1] for item in categories_rev.iteritems()))
  84
  85     class Meta:
  86         ordering = ('sort_key',)
  87         verbose_name = _('tag')
  88         verbose_name_plural = _('tags')
  89         unique_together = (("slug", "category"),)
  90
  91     def __unicode__(self):
  92         return self.name
  93
  94     def __repr__(self):
  95         return "Tag(slug=%r)" % self.slug
  96
  97     @permalink
  98     def get_absolute_url(self):
  99         return ('catalogue.views.tagged_object_list', [self.url_chunk])
 100
 101     def has_description(self):
 102         return len(self.description) > 0
 103     has_description.short_description = _('description')
 104     has_description.boolean = True
 105
 106     def get_count(self):
 107         """Returns global book count for book tags, fragment count for themes."""
 108
 109         if self.category == 'book':
 110             # never used
 111             objects = Book.objects.none()
 112         elif self.category == 'theme':
 113             objects = Fragment.tagged.with_all((self,))
 114         else:
 115             objects = Book.tagged.with_all((self,)).order_by()
 116             if self.category != 'set':
 117                 # eliminate descendants
 118                 l_tags = Tag.objects.filter(slug__in=[book.book_tag_slug() for book in objects])
 119                 descendants_keys = [book.pk for book in Book.tagged.with_any(l_tags)]
 120                 if descendants_keys:
 121                     objects = objects.exclude(pk__in=descendants_keys)
 122         return objects.count()
 123
 124     @staticmethod
 125     def get_tag_list(tags):
 126         if isinstance(tags, basestring):
 127             real_tags = []
 128             ambiguous_slugs = []
 129             category = None
 130             deprecated = False
 131             tags_splitted = tags.split('/')
 132             for name in tags_splitted:
 133                 if category:
 134                     real_tags.append(Tag.objects.get(slug=name, category=category))
 135                     category = None
 136                 elif name in Tag.categories_rev:
 137                     category = Tag.categories_rev[name]
 138                 else:
 139                     try:
 140                         real_tags.append(Tag.objects.exclude(category='book').get(slug=name))
 141                         deprecated = True
 142                     except Tag.MultipleObjectsReturned, e:
 143                         ambiguous_slugs.append(name)
 144
 145             if category:
 146                 # something strange left off
 147                 raise Tag.DoesNotExist()
 148             if ambiguous_slugs:
 149                 # some tags should be qualified
 150                 e = Tag.MultipleObjectsReturned()
 151                 e.tags = real_tags
 152                 e.ambiguous_slugs = ambiguous_slugs
 153                 raise e
 154             if deprecated:
 155                 e = Tag.UrlDeprecationWarning()
 156                 e.tags = real_tags
 157                 raise e
 158             return real_tags
 159         else:
 160             return TagBase.get_tag_list(tags)
 161
 162     @property
 163     def url_chunk(self):
 164         return '/'.join((Tag.categories_dict[self.category], self.slug))
 165
 166     @staticmethod
 167     def tags_from_info(info):
 168         from slughifi import slughifi
 169         from sortify import sortify
 170         meta_tags = []
 171         categories = (('kinds', 'kind'), ('genres', 'genre'), ('authors', 'author'), ('epochs', 'epoch'))
 172         for field_name, category in categories:
 173             try:
 174                 tag_names = getattr(info, field_name)
 175             except:
 176                 try:
 177                     tag_names = [getattr(info, category)]
 178                 except:
 179                     # For instance, Pictures do not have 'genre' field.
 180                     continue
 181             for tag_name in tag_names:
 182                 tag_sort_key = tag_name
 183                 if category == 'author':
 184                     tag_sort_key = tag_name.last_name
 185                     tag_name = tag_name.readable()
 186                 tag, created = Tag.objects.get_or_create(slug=slughifi(tag_name), category=category)
 187                 if created:
 188                     tag.name = tag_name
 189                     tag.sort_key = sortify(tag_sort_key.lower())
 190                     tag.save()
 191                 meta_tags.append(tag)
 192         return meta_tags
 193
 194
 195
 196 def get_dynamic_path(media, filename, ext=None, maxlen=100):
 197     from slughifi import slughifi
 198
 199     # how to put related book's slug here?
 200     if not ext:
 201         # BookMedia case
 202         ext = media.formats[media.type].ext
 203     if media is None or not media.name:
 204         name = slughifi(filename.split(".")[0])
 205     else:
 206         name = slughifi(media.name)
 207     return 'book/%s/%s.%s' % (ext, name[:maxlen-len('book/%s/.%s' % (ext, ext))-4], ext)
 208
 209
 210 # TODO: why is this hard-coded ?
 211 def book_upload_path(ext=None, maxlen=100):
 212     return lambda *args: get_dynamic_path(*args, ext=ext, maxlen=maxlen)
 213
 214
 215 class BookMedia(models.Model):
 216     FileFormat = namedtuple("FileFormat", "name ext")
 217     formats = SortedDict([
 218         ('mp3', FileFormat(name='MP3', ext='mp3')),
 219         ('ogg', FileFormat(name='Ogg Vorbis', ext='ogg')),
 220         ('daisy', FileFormat(name='DAISY', ext='daisy.zip')),
 221     ])
 222     format_choices = [(k, _('%s file') % t.name)
 223             for k, t in formats.items()]
 224
 225     type        = models.CharField(_('type'), choices=format_choices, max_length="100")
 226     name        = models.CharField(_('name'), max_length="100")
 227     file        = OverwritingFileField(_('file'), upload_to=book_upload_path())
 228     uploaded_at = models.DateTimeField(_('creation date'), auto_now_add=True, editable=False)
 229     extra_info  = JSONField(_('extra information'), default='{}', editable=False)
 230     book = models.ForeignKey('Book', related_name='media')
 231     source_sha1 = models.CharField(null=True, blank=True, max_length=40, editable=False)
 232
 233     def __unicode__(self):
 234         return "%s (%s)" % (self.name, self.file.name.split("/")[-1])
 235
 236     class Meta:
 237         ordering            = ('type', 'name')
 238         verbose_name        = _('book media')
 239         verbose_name_plural = _('book media')
 240
 241     def save(self, *args, **kwargs):
 242         from slughifi import slughifi
 243         from catalogue.utils import ExistingFile, remove_zip
 244
 245         try:
 246             old = BookMedia.objects.get(pk=self.pk)
 247         except BookMedia.DoesNotExist:
 248             old = None
 249         else:
 250             # if name changed, change the file name, too
 251             if slughifi(self.name) != slughifi(old.name):
 252                 self.file.save(None, ExistingFile(self.file.path), save=False, leave=True)
 253
 254         super(BookMedia, self).save(*args, **kwargs)
 255
 256         # remove the zip package for book with modified media
 257         if old:
 258             remove_zip("%s_%s" % (old.book.slug, old.type))
 259         remove_zip("%s_%s" % (self.book.slug, self.type))
 260
 261         extra_info = self.get_extra_info_value()
 262         extra_info.update(self.read_meta())
 263         self.set_extra_info_value(extra_info)
 264         self.source_sha1 = self.read_source_sha1(self.file.path, self.type)
 265         return super(BookMedia, self).save(*args, **kwargs)
 266
 267     def read_meta(self):
 268         """
 269             Reads some metadata from the audiobook.
 270         """
 271         import mutagen
 272         from mutagen import id3
 273
 274         artist_name = director_name = project = funded_by = ''
 275         if self.type == 'mp3':
 276             try:
 277                 audio = id3.ID3(self.file.path)
 278                 artist_name = ', '.join(', '.join(tag.text) for tag in audio.getall('TPE1'))
 279                 director_name = ', '.join(', '.join(tag.text) for tag in audio.getall('TPE3'))
 280                 project = ", ".join([t.data for t in audio.getall('PRIV')
 281                         if t.owner=='wolnelektury.pl?project'])
 282                 funded_by = ", ".join([t.data for t in audio.getall('PRIV')
 283                         if t.owner=='wolnelektury.pl?funded_by'])
 284             except:
 285                 pass
 286         elif self.type == 'ogg':
 287             try:
 288                 audio = mutagen.File(self.file.path)
 289                 artist_name = ', '.join(audio.get('artist', []))
 290                 director_name = ', '.join(audio.get('conductor', []))
 291                 project = ", ".join(audio.get('project', []))
 292                 funded_by = ", ".join(audio.get('funded_by', []))
 293             except:
 294                 pass
 295         else:
 296             return {}
 297         return {'artist_name': artist_name, 'director_name': director_name,
 298                 'project': project, 'funded_by': funded_by}
 299
 300     @staticmethod
 301     def read_source_sha1(filepath, filetype):
 302         """
 303             Reads source file SHA1 from audiobok metadata.
 304         """
 305         import mutagen
 306         from mutagen import id3
 307
 308         if filetype == 'mp3':
 309             try:
 310                 audio = id3.ID3(filepath)
 311                 return [t.data for t in audio.getall('PRIV')
 312                         if t.owner=='wolnelektury.pl?flac_sha1'][0]
 313             except:
 314                 return None
 315         elif filetype == 'ogg':
 316             try:
 317                 audio = mutagen.File(filepath)
 318                 return audio.get('flac_sha1', [None])[0]
 319             except:
 320                 return None
 321         else:
 322             return None
 323
 324
 325 class Book(models.Model):
 326     title         = models.CharField(_('title'), max_length=120)
 327     sort_key = models.CharField(_('sort key'), max_length=120, db_index=True, editable=False)
 328     slug = models.SlugField(_('slug'), max_length=120, db_index=True,
 329             unique=True)
 330     common_slug = models.SlugField(_('slug'), max_length=120, db_index=True)
 331     language = models.CharField(_('language code'), max_length=3, db_index=True,
 332                     default=settings.CATALOGUE_DEFAULT_LANGUAGE)
 333     description   = models.TextField(_('description'), blank=True)
 334     created_at    = models.DateTimeField(_('creation date'), auto_now_add=True, db_index=True)
 335     changed_at    = models.DateTimeField(_('creation date'), auto_now=True, db_index=True)
 336     parent_number = models.IntegerField(_('parent number'), default=0)
 337     extra_info    = JSONField(_('extra information'), default='{}')
 338     gazeta_link   = models.CharField(blank=True, max_length=240)
 339     wiki_link     = models.CharField(blank=True, max_length=240)
 340     # files generated during publication
 341
 342     cover = models.FileField(_('cover'), upload_to=book_upload_path('png'),
 343                 null=True, blank=True)
 344     ebook_formats = ['pdf', 'epub', 'mobi', 'txt']
 345     formats = ebook_formats + ['html', 'xml']
 346
 347     parent        = models.ForeignKey('self', blank=True, null=True, related_name='children')
 348
 349     _related_info = jsonfield.JSONField(blank=True, null=True, editable=False)
 350
 351     objects  = models.Manager()
 352     tagged   = managers.ModelTaggedItemManager(Tag)
 353     tags     = managers.TagDescriptor(Tag)
 354
 355     html_built = django.dispatch.Signal()
 356     published = django.dispatch.Signal()
 357
 358     class AlreadyExists(Exception):
 359         pass
 360
 361     class Meta:
 362         ordering = ('sort_key',)
 363         verbose_name = _('book')
 364         verbose_name_plural = _('books')
 365
 366     def __unicode__(self):
 367         return self.title
 368
 369     def save(self, force_insert=False, force_update=False, reset_short_html=True, **kwargs):
 370         from sortify import sortify
 371
 372         self.sort_key = sortify(self.title)
 373
 374         ret = super(Book, self).save(force_insert, force_update)
 375
 376         if reset_short_html:
 377             self.reset_short_html()
 378
 379         return ret
 380
 381     @permalink
 382     def get_absolute_url(self):
 383         return ('catalogue.views.book_detail', [self.slug])
 384
 385     @property
 386     def name(self):
 387         return self.title
 388
 389     def book_tag_slug(self):
 390         return ('l-' + self.slug)[:120]
 391
 392     def book_tag(self):
 393         slug = self.book_tag_slug()
 394         book_tag, created = Tag.objects.get_or_create(slug=slug, category='book')
 395         if created:
 396             book_tag.name = self.title[:50]
 397             book_tag.sort_key = self.title.lower()
 398             book_tag.save()
 399         return book_tag
 400
 401     def has_media(self, type_):
 402         if type_ in Book.formats:
 403             return bool(getattr(self, "%s_file" % type_))
 404         else:
 405             return self.media.filter(type=type_).exists()
 406
 407     def get_media(self, type_):
 408         if self.has_media(type_):
 409             if type_ in Book.formats:
 410                 return getattr(self, "%s_file" % type_)
 411             else:
 412                 return self.media.filter(type=type_)
 413         else:
 414             return None
 415
 416     def get_mp3(self):
 417         return self.get_media("mp3")
 418     def get_odt(self):
 419         return self.get_media("odt")
 420     def get_ogg(self):
 421         return self.get_media("ogg")
 422     def get_daisy(self):
 423         return self.get_media("daisy")
 424
 425     def reset_short_html(self):
 426         if self.id is None:
 427             return
 428
 429         type(self).objects.filter(pk=self.pk).update(_related_info=None)
 430         # Fragment.short_html relies on book's tags, so reset it here too
 431         for fragm in self.fragments.all():
 432             fragm.reset_short_html()
 433
 434     def has_description(self):
 435         return len(self.description) > 0
 436     has_description.short_description = _('description')
 437     has_description.boolean = True
 438
 439     # ugly ugly ugly
 440     def has_mp3_file(self):
 441         return bool(self.has_media("mp3"))
 442     has_mp3_file.short_description = 'MP3'
 443     has_mp3_file.boolean = True
 444
 445     def has_ogg_file(self):
 446         return bool(self.has_media("ogg"))
 447     has_ogg_file.short_description = 'OGG'
 448     has_ogg_file.boolean = True
 449
 450     def has_daisy_file(self):
 451         return bool(self.has_media("daisy"))
 452     has_daisy_file.short_description = 'DAISY'
 453     has_daisy_file.boolean = True
 454
 455     def wldocument(self, parse_dublincore=True):
 456         from catalogue.import_utils import ORMDocProvider
 457         from librarian.parser import WLDocument
 458
 459         return WLDocument.from_file(self.xml_file.path,
 460                 provider=ORMDocProvider(self),
 461                 parse_dublincore=parse_dublincore)
 462
 463     def build_cover(self, book_info=None):
 464         """(Re)builds the cover image."""
 465         from StringIO import StringIO
 466         from django.core.files.base import ContentFile
 467         from librarian.cover import WLCover
 468
 469         if book_info is None:
 470             book_info = self.wldocument().book_info
 471
 472         cover = WLCover(book_info).image()
 473         imgstr = StringIO()
 474         cover.save(imgstr, 'png')
 475         self.cover.save(None, ContentFile(imgstr.getvalue()))
 476
 477     def build_html(self):
 478         from django.core.files.base import ContentFile
 479         from slughifi import slughifi
 480         from librarian import html
 481
 482         meta_tags = list(self.tags.filter(
 483             category__in=('author', 'epoch', 'genre', 'kind')))
 484         book_tag = self.book_tag()
 485
 486         html_output = self.wldocument(parse_dublincore=False).as_html()
 487         if html_output:
 488             self.html_file.save('%s.html' % self.slug,
 489                     ContentFile(html_output.get_string()))
 490
 491             # get ancestor l-tags for adding to new fragments
 492             ancestor_tags = []
 493             p = self.parent
 494             while p:
 495                 ancestor_tags.append(p.book_tag())
 496                 p = p.parent
 497
 498             # Delete old fragments and create them from scratch
 499             self.fragments.all().delete()
 500             # Extract fragments
 501             closed_fragments, open_fragments = html.extract_fragments(self.html_file.path)
 502             for fragment in closed_fragments.values():
 503                 try:
 504                     theme_names = [s.strip() for s in fragment.themes.split(',')]
 505                 except AttributeError:
 506                     continue
 507                 themes = []
 508                 for theme_name in theme_names:
 509                     if not theme_name:
 510                         continue
 511                     tag, created = Tag.objects.get_or_create(slug=slughifi(theme_name), category='theme')
 512                     if created:
 513                         tag.name = theme_name
 514                         tag.sort_key = theme_name.lower()
 515                         tag.save()
 516                     themes.append(tag)
 517                 if not themes:
 518                     continue
 519
 520                 text = fragment.to_string()
 521                 short_text = truncate_html_words(text, 15)
 522                 if text == short_text:
 523                     short_text = ''
 524                 new_fragment = Fragment.objects.create(anchor=fragment.id, book=self,
 525                     text=text, short_text=short_text)
 526
 527                 new_fragment.save()
 528                 new_fragment.tags = set(meta_tags + themes + [book_tag] + ancestor_tags)
 529             self.save()
 530             self.html_built.send(sender=self)
 531             return True
 532         return False
 533
 534     # Thin wrappers for builder tasks
 535     def build_pdf(self, *args, **kwargs):
 536         return tasks.build_pdf.delay(self.pk, *args, **kwargs)
 537     def build_epub(self, *args, **kwargs):
 538         return tasks.build_epub.delay(self.pk, *args, **kwargs)
 539     def build_mobi(self, *args, **kwargs):
 540         return tasks.build_mobi.delay(self.pk, *args, **kwargs)
 541     def build_txt(self, *args, **kwargs):
 542         return tasks.build_txt.delay(self.pk, *args, **kwargs)
 543
 544     @staticmethod
 545     def zip_format(format_):
 546         def pretty_file_name(book):
 547             return "%s/%s.%s" % (
 548                 b.get_extra_info_value()['author'],
 549                 b.slug,
 550                 format_)
 551
 552         field_name = "%s_file" % format_
 553         books = Book.objects.filter(parent=None).exclude(**{field_name: ""})
 554         paths = [(pretty_file_name(b), getattr(b, field_name).path)
 555                     for b in books]
 556         return create_zip(paths,
 557                     getattr(settings, "ALL_%s_ZIP" % format_.upper()))
 558
 559     def zip_audiobooks(self, format_):
 560         bm = BookMedia.objects.filter(book=self, type=format_)
 561         paths = map(lambda bm: (None, bm.file.path), bm)
 562         return create_zip(paths, "%s_%s" % (self.slug, format_))
 563
 564     def search_index(self, book_info=None, reuse_index=False, index_tags=True):
 565         if reuse_index:
 566             idx = search.ReusableIndex()
 567         else:
 568             idx = search.Index()
 569
 570         idx.open()
 571         try:
 572             idx.index_book(self, book_info)
 573             if index_tags:
 574                 idx.index_tags()
 575         finally:
 576             idx.close()
 577
 578     @classmethod
 579     def from_xml_file(cls, xml_file, **kwargs):
 580         from django.core.files import File
 581         from librarian import dcparser
 582
 583         # use librarian to parse meta-data
 584         book_info = dcparser.parse(xml_file)
 585
 586         if not isinstance(xml_file, File):
 587             xml_file = File(open(xml_file))
 588
 589         try:
 590             return cls.from_text_and_meta(xml_file, book_info, **kwargs)
 591         finally:
 592             xml_file.close()
 593
 594     @classmethod
 595     def from_text_and_meta(cls, raw_file, book_info, overwrite=False,
 596             build_epub=True, build_txt=True, build_pdf=True, build_mobi=True,
 597             search_index=True, search_index_tags=True, search_index_reuse=False):
 598
 599         # check for parts before we do anything
 600         children = []
 601         if hasattr(book_info, 'parts'):
 602             for part_url in book_info.parts:
 603                 try:
 604                     children.append(Book.objects.get(slug=part_url.slug))
 605                 except Book.DoesNotExist:
 606                     raise Book.DoesNotExist(_('Book "%s" does not exist.') %
 607                             part_url.slug)
 608
 609
 610         # Read book metadata
 611         book_slug = book_info.url.slug
 612         if re.search(r'[^a-z0-9-]', book_slug):
 613             raise ValueError('Invalid characters in slug')
 614         book, created = Book.objects.get_or_create(slug=book_slug)
 615
 616         if created:
 617             book_shelves = []
 618         else:
 619             if not overwrite:
 620                 raise Book.AlreadyExists(_('Book %s already exists') % (
 621                         book_slug))
 622             # Save shelves for this book
 623             book_shelves = list(book.tags.filter(category='set'))
 624
 625         book.language = book_info.language
 626         book.title = book_info.title
 627         if book_info.variant_of:
 628             book.common_slug = book_info.variant_of.slug
 629         else:
 630             book.common_slug = book.slug
 631         book.set_extra_info_value(book_info.to_dict())
 632         book.save()
 633
 634         meta_tags = Tag.tags_from_info(book_info)
 635
 636         book.tags = set(meta_tags + book_shelves)
 637
 638         book_tag = book.book_tag()
 639
 640         for n, child_book in enumerate(children):
 641             child_book.parent = book
 642             child_book.parent_number = n
 643             child_book.save()
 644
 645         # Save XML and HTML files
 646         book.xml_file.save('%s.xml' % book.slug, raw_file, save=False)
 647
 648         # delete old fragments when overwriting
 649         book.fragments.all().delete()
 650
 651         if book.build_html():
 652             if not settings.NO_BUILD_TXT and build_txt:
 653                 book.build_txt()
 654
 655         book.build_cover(book_info)
 656
 657         if not settings.NO_BUILD_EPUB and build_epub:
 658             book.build_epub()
 659
 660         if not settings.NO_BUILD_PDF and build_pdf:
 661             book.build_pdf()
 662
 663         if not settings.NO_BUILD_MOBI and build_mobi:
 664             book.build_mobi()
 665
 666         if not settings.NO_SEARCH_INDEX and search_index:
 667             book.search_index(index_tags=search_index_tags, reuse_index=search_index_reuse)
 668             #index_book.delay(book.id, book_info)
 669
 670         book_descendants = list(book.children.all())
 671         descendants_tags = set()
 672         # add l-tag to descendants and their fragments
 673         while len(book_descendants) > 0:
 674             child_book = book_descendants.pop(0)
 675             descendants_tags.update(child_book.tags)
 676             child_book.tags = list(child_book.tags) + [book_tag]
 677             child_book.save()
 678             for fragment in child_book.fragments.all():
 679                 fragment.tags = set(list(fragment.tags) + [book_tag])
 680             book_descendants += list(child_book.children.all())
 681
 682         for tag in descendants_tags:
 683             tasks.touch_tag(tag)
 684
 685         book.save()
 686
 687         # refresh cache
 688         book.reset_tag_counter()
 689         book.reset_theme_counter()
 690
 691         cls.published.send(sender=book)
 692         return book
 693
 694     def related_info(self):
 695         """Keeps info about related objects (tags, media) in cache field."""
 696         if self._related_info is not None:
 697             return self._related_info
 698         else:
 699             rel = {'tags': {}, 'media': {}}
 700
 701             tags = self.tags.filter(category__in=(
 702                     'author', 'kind', 'genre', 'epoch'))
 703             tags = split_tags(tags)
 704             for category in tags:
 705                 rel['tags'][category] = [
 706                         (t.name, t.slug) for t in tags[category]]
 707
 708             for media_format in BookMedia.formats:
 709                 rel['media'][media_format] = self.has_media(media_format)
 710
 711             book = self
 712             parents = []
 713             while book.parent:
 714                 parents.append((book.parent.title, book.parent.slug))
 715                 book = book.parent
 716             parents = parents[::-1]
 717             if parents:
 718                 rel['parents'] = parents
 719
 720             if self.pk:
 721                 type(self).objects.filter(pk=self.pk).update(_related_info=rel)
 722             return rel
 723
 724     def related_themes(self):
 725         theme_counter = self.theme_counter
 726         book_themes = Tag.objects.filter(pk__in=theme_counter.keys())
 727         for tag in book_themes:
 728             tag.count = theme_counter[tag.pk]
 729         return book_themes
 730
 731     def reset_tag_counter(self):
 732         if self.id is None:
 733             return
 734
 735         cache_key = "Book.tag_counter/%d" % self.id
 736         permanent_cache.delete(cache_key)
 737         if self.parent:
 738             self.parent.reset_tag_counter()
 739
 740     @property
 741     def tag_counter(self):
 742         if self.id:
 743             cache_key = "Book.tag_counter/%d" % self.id
 744             tags = permanent_cache.get(cache_key)
 745         else:
 746             tags = None
 747
 748         if tags is None:
 749             tags = {}
 750             for child in self.children.all().order_by():
 751                 for tag_pk, value in child.tag_counter.iteritems():
 752                     tags[tag_pk] = tags.get(tag_pk, 0) + value
 753             for tag in self.tags.exclude(category__in=('book', 'theme', 'set')).order_by():
 754                 tags[tag.pk] = 1
 755
 756             if self.id:
 757                 permanent_cache.set(cache_key, tags)
 758         return tags
 759
 760     def reset_theme_counter(self):
 761         if self.id is None:
 762             return
 763
 764         cache_key = "Book.theme_counter/%d" % self.id
 765         permanent_cache.delete(cache_key)
 766         if self.parent:
 767             self.parent.reset_theme_counter()
 768
 769     @property
 770     def theme_counter(self):
 771         if self.id:
 772             cache_key = "Book.theme_counter/%d" % self.id
 773             tags = permanent_cache.get(cache_key)
 774         else:
 775             tags = None
 776
 777         if tags is None:
 778             tags = {}
 779             for fragment in Fragment.tagged.with_any([self.book_tag()]).order_by():
 780                 for tag in fragment.tags.filter(category='theme').order_by():
 781                     tags[tag.pk] = tags.get(tag.pk, 0) + 1
 782
 783             if self.id:
 784                 permanent_cache.set(cache_key, tags)
 785         return tags
 786
 787     def pretty_title(self, html_links=False):
 788         book = self
 789         names = list(book.tags.filter(category='author'))
 790
 791         books = []
 792         while book:
 793             books.append(book)
 794             book = book.parent
 795         names.extend(reversed(books))
 796
 797         if html_links:
 798             names = ['<a href="%s">%s</a>' % (tag.get_absolute_url(), tag.name) for tag in names]
 799         else:
 800             names = [tag.name for tag in names]
 801
 802         return ', '.join(names)
 803
 804     @classmethod
 805     def tagged_top_level(cls, tags):
 806         """ Returns top-level books tagged with `tags'.
 807
 808         It only returns those books which don't have ancestors which are
 809         also tagged with those tags.
 810
 811         """
 812         # get relevant books and their tags
 813         objects = cls.tagged.with_all(tags)
 814         # eliminate descendants
 815         l_tags = Tag.objects.filter(category='book', slug__in=[book.book_tag_slug() for book in objects])
 816         descendants_keys = [book.pk for book in cls.tagged.with_any(l_tags)]
 817         if descendants_keys:
 818             objects = objects.exclude(pk__in=descendants_keys)
 819
 820         return objects
 821
 822     @classmethod
 823     def book_list(cls, filter=None):
 824         """Generates a hierarchical listing of all books.
 825
 826         Books are optionally filtered with a test function.
 827
 828         """
 829
 830         books_by_parent = {}
 831         books = cls.objects.all().order_by('parent_number', 'sort_key').only(
 832                 'title', 'parent', 'slug')
 833         if filter:
 834             books = books.filter(filter).distinct()
 835             book_ids = set((book.pk for book in books))
 836             for book in books:
 837                 parent = book.parent_id
 838                 if parent not in book_ids:
 839                     parent = None
 840                 books_by_parent.setdefault(parent, []).append(book)
 841         else:
 842             for book in books:
 843                 books_by_parent.setdefault(book.parent_id, []).append(book)
 844
 845         orphans = []
 846         books_by_author = SortedDict()
 847         for tag in Tag.objects.filter(category='author'):
 848             books_by_author[tag] = []
 849
 850         for book in books_by_parent.get(None,()):
 851             authors = list(book.tags.filter(category='author'))
 852             if authors:
 853                 for author in authors:
 854                     books_by_author[author].append(book)
 855             else:
 856                 orphans.append(book)
 857
 858         return books_by_author, orphans, books_by_parent
 859
 860     _audiences_pl = {
 861         "SP1": (1, u"szkoła podstawowa"),
 862         "SP2": (1, u"szkoła podstawowa"),
 863         "P": (1, u"szkoła podstawowa"),
 864         "G": (2, u"gimnazjum"),
 865         "L": (3, u"liceum"),
 866         "LP": (3, u"liceum"),
 867     }
 868     def audiences_pl(self):
 869         audiences = self.get_extra_info_value().get('audiences', [])
 870         audiences = sorted(set([self._audiences_pl[a] for a in audiences]))
 871         return [a[1] for a in audiences]
 872
 873     def choose_fragment(self):
 874         tag = self.book_tag()
 875         fragments = Fragment.tagged.with_any([tag])
 876         if fragments.exists():
 877             return fragments.order_by('?')[0]
 878         elif self.parent:
 879             return self.parent.choose_fragment()
 880         else:
 881             return None
 882
 883
 884 def _has_factory(ftype):
 885     has = lambda self: bool(getattr(self, "%s_file" % ftype))
 886     has.short_description = t.upper()
 887     has.boolean = True
 888     has.__name__ = "has_%s_file" % ftype
 889     return has
 890
 891
 892 # add the file fields
 893 for t in Book.formats:
 894     field_name = "%s_file" % t
 895     models.FileField(_("%s file" % t.upper()),
 896             upload_to=book_upload_path(t),
 897             blank=True).contribute_to_class(Book, field_name)
 898
 899     setattr(Book, "has_%s_file" % t, _has_factory(t))
 900
 901
 902 class Fragment(models.Model):
 903     text = models.TextField()
 904     short_text = models.TextField(editable=False)
 905     anchor = models.CharField(max_length=120)
 906     book = models.ForeignKey(Book, related_name='fragments')
 907
 908     objects = models.Manager()
 909     tagged = managers.ModelTaggedItemManager(Tag)
 910     tags = managers.TagDescriptor(Tag)
 911
 912     class Meta:
 913         ordering = ('book', 'anchor',)
 914         verbose_name = _('fragment')
 915         verbose_name_plural = _('fragments')
 916
 917     def get_absolute_url(self):
 918         return '%s#m%s' % (reverse('book_text', args=[self.book.slug]), self.anchor)
 919
 920     def reset_short_html(self):
 921         if self.id is None:
 922             return
 923
 924         cache_key = "Fragment.short_html/%d/%s"
 925         for lang, langname in settings.LANGUAGES:
 926             permanent_cache.delete(cache_key % (self.id, lang))
 927
 928     def get_short_text(self):
 929         """Returns short version of the fragment."""
 930         return self.short_text if self.short_text else self.text
 931
 932     def short_html(self):
 933         if self.id:
 934             cache_key = "Fragment.short_html/%d/%s" % (self.id, get_language())
 935             short_html = permanent_cache.get(cache_key)
 936         else:
 937             short_html = None
 938
 939         if short_html is not None:
 940             return mark_safe(short_html)
 941         else:
 942             short_html = unicode(render_to_string('catalogue/fragment_short.html',
 943                 {'fragment': self}))
 944             if self.id:
 945                 permanent_cache.set(cache_key, short_html)
 946             return mark_safe(short_html)
 947
 948
 949 class Collection(models.Model):
 950     """A collection of books, which might be defined before publishing them."""
 951     title = models.CharField(_('title'), max_length=120, db_index=True)
 952     slug = models.SlugField(_('slug'), max_length=120, primary_key=True)
 953     description = models.TextField(_('description'), null=True, blank=True)
 954
 955     models.SlugField(_('slug'), max_length=120, unique=True, db_index=True)
 956     book_slugs = models.TextField(_('book slugs'))
 957
 958     class Meta:
 959         ordering = ('title',)
 960         verbose_name = _('collection')
 961         verbose_name_plural = _('collections')
 962
 963     def __unicode__(self):
 964         return self.title
 965
 966
 967 ###########
 968 #
 969 # SIGNALS
 970 #
 971 ###########
 972
 973
 974 def _tags_updated_handler(sender, affected_tags, **kwargs):
 975     # reset tag global counter
 976     # we want Tag.changed_at updated for API to know the tag was touched
 977     for tag in affected_tags:
 978         tasks.touch_tag(tag)
 979
 980     # if book tags changed, reset book tag counter
 981     if isinstance(sender, Book) and \
 982                 Tag.objects.filter(pk__in=(tag.pk for tag in affected_tags)).\
 983                     exclude(category__in=('book', 'theme', 'set')).count():
 984         sender.reset_tag_counter()
 985     # if fragment theme changed, reset book theme counter
 986     elif isinstance(sender, Fragment) and \
 987                 Tag.objects.filter(pk__in=(tag.pk for tag in affected_tags)).\
 988                     filter(category='theme').count():
 989         sender.book.reset_theme_counter()
 990 tags_updated.connect(_tags_updated_handler)
 991
 992
 993 def _pre_delete_handler(sender, instance, **kwargs):
 994     """ refresh Book on BookMedia delete """
 995     if sender == BookMedia:
 996         instance.book.save()
 997 pre_delete.connect(_pre_delete_handler)
 998
 999
1000 def _post_save_handler(sender, instance, **kwargs):
1001     """ refresh all the short_html stuff on BookMedia update """
1002     if sender == BookMedia:
1003         instance.book.save()
1004 post_save.connect(_post_save_handler)
1005
1006
1007 @django.dispatch.receiver(post_delete, sender=Book)
1008 def _remove_book_from_index_handler(sender, instance, **kwargs):
1009     """ remove the book from search index, when it is deleted."""
1010     idx = search.Index()
1011     idx.open(timeout=10000)  # 10 seconds timeout.
1012     try:
1013         idx.remove_book(instance)
1014     finally:
1015         idx.close()