apps/catalogue/models/book.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 import re
   6 from django.conf import settings
   7 from django.core.cache import get_cache
   8 from django.db import models
   9 from django.db.models import permalink
  10 import django.dispatch
  11 from django.utils.datastructures import SortedDict
  12 from django.utils.translation import ugettext_lazy as _
  13 import jsonfield
  14 from catalogue import constants
  15 from catalogue.fields import EbookField
  16 from catalogue.models import Tag, Fragment, BookMedia
  17 from catalogue.utils import create_zip, split_tags, book_upload_path, related_tag_name
  18 from catalogue import app_settings
  19 from catalogue import tasks
  20 from newtagging import managers
  21
  22
  23 permanent_cache = get_cache('permanent')
  24
  25
  26 class Book(models.Model):
  27     """Represents a book imported from WL-XML."""
  28     title         = models.CharField(_('title'), max_length=120)
  29     sort_key = models.CharField(_('sort key'), max_length=120, db_index=True, editable=False)
  30     sort_key_author = models.CharField(_('sort key by author'), max_length=120, db_index=True, editable=False, default=u'')
  31     slug = models.SlugField(_('slug'), max_length=120, db_index=True,
  32             unique=True)
  33     common_slug = models.SlugField(_('slug'), max_length=120, db_index=True)
  34     language = models.CharField(_('language code'), max_length=3, db_index=True,
  35                     default=app_settings.DEFAULT_LANGUAGE)
  36     description   = models.TextField(_('description'), blank=True)
  37     created_at    = models.DateTimeField(_('creation date'), auto_now_add=True, db_index=True)
  38     changed_at    = models.DateTimeField(_('creation date'), auto_now=True, db_index=True)
  39     parent_number = models.IntegerField(_('parent number'), default=0)
  40     extra_info    = jsonfield.JSONField(_('extra information'), default={})
  41     gazeta_link   = models.CharField(blank=True, max_length=240)
  42     wiki_link     = models.CharField(blank=True, max_length=240)
  43     # files generated during publication
  44
  45     cover = EbookField('cover', _('cover'),
  46                 upload_to=book_upload_path('jpg'), null=True, blank=True)
  47     # Cleaner version of cover for thumbs
  48     cover_thumb = EbookField('cover_thumb', _('cover thumbnail'),
  49                 upload_to=book_upload_path('th.jpg'), null=True, blank=True)
  50     ebook_formats = constants.EBOOK_FORMATS
  51     formats = ebook_formats + ['html', 'xml']
  52
  53     parent = models.ForeignKey('self', blank=True, null=True,
  54         related_name='children')
  55
  56     _related_info = jsonfield.JSONField(blank=True, null=True, editable=False)
  57
  58     objects  = models.Manager()
  59     tagged   = managers.ModelTaggedItemManager(Tag)
  60     tags     = managers.TagDescriptor(Tag)
  61
  62     html_built = django.dispatch.Signal()
  63     published = django.dispatch.Signal()
  64
  65     class AlreadyExists(Exception):
  66         pass
  67
  68     class Meta:
  69         ordering = ('sort_key',)
  70         verbose_name = _('book')
  71         verbose_name_plural = _('books')
  72         app_label = 'catalogue'
  73
  74     def __unicode__(self):
  75         return self.title
  76
  77     def save(self, force_insert=False, force_update=False, reset_short_html=True, **kwargs):
  78         from sortify import sortify
  79
  80         self.sort_key = sortify(self.title)
  81         self.title = unicode(self.title) # ???
  82
  83         ret = super(Book, self).save(force_insert, force_update, **kwargs)
  84
  85         if reset_short_html:
  86             self.reset_short_html()
  87
  88         return ret
  89
  90     @permalink
  91     def get_absolute_url(self):
  92         return ('catalogue.views.book_detail', [self.slug])
  93
  94     @staticmethod
  95     @permalink
  96     def create_url(slug):
  97         return ('catalogue.views.book_detail', [slug])
  98
  99     @property
 100     def name(self):
 101         return self.title
 102
 103     def language_code(self):
 104         return constants.LANGUAGES_3TO2.get(self.language, self.language)
 105
 106     def language_name(self):
 107         return dict(settings.LANGUAGES).get(self.language_code(), "")
 108
 109     def book_tag_slug(self):
 110         return ('l-' + self.slug)[:120]
 111
 112     def book_tag(self):
 113         slug = self.book_tag_slug()
 114         book_tag, created = Tag.objects.get_or_create(slug=slug, category='book')
 115         if created:
 116             book_tag.name = self.title[:50]
 117             book_tag.sort_key = self.title.lower()
 118             book_tag.save()
 119         return book_tag
 120
 121     def has_media(self, type_):
 122         if type_ in Book.formats:
 123             return bool(getattr(self, "%s_file" % type_))
 124         else:
 125             return self.media.filter(type=type_).exists()
 126
 127     def get_media(self, type_):
 128         if self.has_media(type_):
 129             if type_ in Book.formats:
 130                 return getattr(self, "%s_file" % type_)
 131             else:
 132                 return self.media.filter(type=type_)
 133         else:
 134             return None
 135
 136     def get_mp3(self):
 137         return self.get_media("mp3")
 138     def get_odt(self):
 139         return self.get_media("odt")
 140     def get_ogg(self):
 141         return self.get_media("ogg")
 142     def get_daisy(self):
 143         return self.get_media("daisy")
 144
 145     def reset_short_html(self):
 146         if self.id is None:
 147             return
 148
 149         type(self).objects.filter(pk=self.pk).update(_related_info=None)
 150         # Fragment.short_html relies on book's tags, so reset it here too
 151         for fragm in self.fragments.all().iterator():
 152             fragm.reset_short_html()
 153
 154         try:
 155             author = self.tags.filter(category='author')[0].sort_key
 156         except IndexError:
 157             author = u''
 158         type(self).objects.filter(pk=self.pk).update(sort_key_author=author)
 159
 160
 161
 162     def has_description(self):
 163         return len(self.description) > 0
 164     has_description.short_description = _('description')
 165     has_description.boolean = True
 166
 167     # ugly ugly ugly
 168     def has_mp3_file(self):
 169         return bool(self.has_media("mp3"))
 170     has_mp3_file.short_description = 'MP3'
 171     has_mp3_file.boolean = True
 172
 173     def has_ogg_file(self):
 174         return bool(self.has_media("ogg"))
 175     has_ogg_file.short_description = 'OGG'
 176     has_ogg_file.boolean = True
 177
 178     def has_daisy_file(self):
 179         return bool(self.has_media("daisy"))
 180     has_daisy_file.short_description = 'DAISY'
 181     has_daisy_file.boolean = True
 182
 183     def wldocument(self, parse_dublincore=True, inherit=True):
 184         from catalogue.import_utils import ORMDocProvider
 185         from librarian.parser import WLDocument
 186
 187         if inherit and self.parent:
 188             meta_fallbacks = self.parent.cover_info()
 189         else:
 190             meta_fallbacks = None
 191
 192         return WLDocument.from_file(self.xml_file.path,
 193                 provider=ORMDocProvider(self),
 194                 parse_dublincore=parse_dublincore,
 195                 meta_fallbacks=meta_fallbacks)
 196
 197     @staticmethod
 198     def zip_format(format_):
 199         def pretty_file_name(book):
 200             return "%s/%s.%s" % (
 201                 book.extra_info['author'],
 202                 book.slug,
 203                 format_)
 204
 205         field_name = "%s_file" % format_
 206         books = Book.objects.filter(parent=None).exclude(**{field_name: ""})
 207         paths = [(pretty_file_name(b), getattr(b, field_name).path)
 208                     for b in books.iterator()]
 209         return create_zip(paths, app_settings.FORMAT_ZIPS[format_])
 210
 211     def zip_audiobooks(self, format_):
 212         bm = BookMedia.objects.filter(book=self, type=format_)
 213         paths = map(lambda bm: (None, bm.file.path), bm)
 214         return create_zip(paths, "%s_%s" % (self.slug, format_))
 215
 216     def search_index(self, book_info=None, index=None, index_tags=True, commit=True):
 217         import search
 218         if index is None:
 219             index = search.Index()
 220         try:
 221             index.index_book(self, book_info)
 222             if index_tags:
 223                 index.index_tags()
 224             if commit:
 225                 index.index.commit()
 226         except Exception, e:
 227             index.index.rollback()
 228             raise e
 229
 230
 231     @classmethod
 232     def from_xml_file(cls, xml_file, **kwargs):
 233         from django.core.files import File
 234         from librarian import dcparser
 235
 236         # use librarian to parse meta-data
 237         book_info = dcparser.parse(xml_file)
 238
 239         if not isinstance(xml_file, File):
 240             xml_file = File(open(xml_file))
 241
 242         try:
 243             return cls.from_text_and_meta(xml_file, book_info, **kwargs)
 244         finally:
 245             xml_file.close()
 246
 247     @classmethod
 248     def from_text_and_meta(cls, raw_file, book_info, overwrite=False,
 249             dont_build=None, search_index=True,
 250             search_index_tags=True):
 251         if dont_build is None:
 252             dont_build = set()
 253         dont_build = set.union(set(dont_build), set(app_settings.DONT_BUILD))
 254
 255         # check for parts before we do anything
 256         children = []
 257         if hasattr(book_info, 'parts'):
 258             for part_url in book_info.parts:
 259                 try:
 260                     children.append(Book.objects.get(slug=part_url.slug))
 261                 except Book.DoesNotExist:
 262                     raise Book.DoesNotExist(_('Book "%s" does not exist.') %
 263                             part_url.slug)
 264
 265         # Read book metadata
 266         book_slug = book_info.url.slug
 267         if re.search(r'[^a-z0-9-]', book_slug):
 268             raise ValueError('Invalid characters in slug')
 269         book, created = Book.objects.get_or_create(slug=book_slug)
 270
 271         if created:
 272             book_shelves = []
 273             old_cover = None
 274         else:
 275             if not overwrite:
 276                 raise Book.AlreadyExists(_('Book %s already exists') % (
 277                         book_slug))
 278             # Save shelves for this book
 279             book_shelves = list(book.tags.filter(category='set'))
 280             old_cover = book.cover_info()
 281
 282         # Save XML file
 283         book.xml_file.save('%s.xml' % book.slug, raw_file, save=False)
 284
 285         book.language = book_info.language
 286         book.title = book_info.title
 287         if book_info.variant_of:
 288             book.common_slug = book_info.variant_of.slug
 289         else:
 290             book.common_slug = book.slug
 291         book.extra_info = book_info.to_dict()
 292         book.save()
 293
 294         meta_tags = Tag.tags_from_info(book_info)
 295
 296         book.tags = set(meta_tags + book_shelves)
 297
 298         cover_changed = old_cover != book.cover_info()
 299         obsolete_children = set(b for b in book.children.all()
 300                                 if b not in children)
 301         notify_cover_changed = []
 302         for n, child_book in enumerate(children):
 303             new_child = child_book.parent != book
 304             child_book.parent = book
 305             child_book.parent_number = n
 306             child_book.save()
 307             if new_child or cover_changed:
 308                 notify_cover_changed.append(child_book)
 309         # Disown unfaithful children and let them cope on their own.
 310         for child in obsolete_children:
 311             child.parent = None
 312             child.parent_number = 0
 313             child.save()
 314             tasks.fix_tree_tags.delay(child)
 315             if old_cover:
 316                 notify_cover_changed.append(child)
 317
 318         # delete old fragments when overwriting
 319         book.fragments.all().delete()
 320         # Build HTML, fix the tree tags, build cover.
 321         has_own_text = bool(book.html_file.build())
 322         tasks.fix_tree_tags.delay(book)
 323         if 'cover' not in dont_build:
 324             book.cover.build_delay()
 325             book.cover_thumb.build_delay()
 326
 327         # No saves behind this point.
 328
 329         if has_own_text:
 330             for format_ in constants.EBOOK_FORMATS_WITHOUT_CHILDREN:
 331                 if format_ not in dont_build:
 332                     getattr(book, '%s_file' % format_).build_delay()
 333         for format_ in constants.EBOOK_FORMATS_WITH_CHILDREN:
 334             if format_ not in dont_build:
 335                 getattr(book, '%s_file' % format_).build_delay()
 336
 337         if not settings.NO_SEARCH_INDEX and search_index:
 338             tasks.index_book.delay(book.id, book_info=book_info, index_tags=search_index_tags)
 339
 340         for child in notify_cover_changed:
 341             child.parent_cover_changed()
 342
 343         cls.published.send(sender=book)
 344         return book
 345
 346     def fix_tree_tags(self):
 347         """Fixes the l-tags on the book's subtree.
 348
 349         Makes sure that:
 350         * the book has its parents book-tags,
 351         * its fragments have the book's and its parents book-tags,
 352         * runs those for every child book too,
 353         * touches all relevant tags,
 354         * resets tag and theme counter on the book and its ancestry.
 355         """
 356         def fix_subtree(book, parent_tags):
 357             affected_tags = set(book.tags)
 358             book.tags = list(book.tags.exclude(category='book')) + parent_tags
 359             sub_parent_tags = parent_tags + [book.book_tag()]
 360             for frag in book.fragments.all():
 361                 affected_tags.update(frag.tags)
 362                 frag.tags = list(frag.tags.exclude(category='book')
 363                                     ) + sub_parent_tags
 364             for child in book.children.all():
 365                 affected_tags.update(fix_subtree(child, sub_parent_tags))
 366             return affected_tags
 367
 368         parent_tags = []
 369         parent = self.parent
 370         while parent is not None:
 371             parent_tags.append(parent.book_tag())
 372             parent = parent.parent
 373
 374         affected_tags = fix_subtree(self, parent_tags)
 375         for tag in affected_tags:
 376             tasks.touch_tag(tag)
 377
 378         book = self
 379         while book is not None:
 380             book.reset_tag_counter()
 381             book.reset_theme_counter()
 382             book = book.parent
 383
 384     def cover_info(self, inherit=True):
 385         """Returns a dictionary to serve as fallback for BookInfo.
 386
 387         For now, the only thing inherited is the cover image.
 388         """
 389         need = False
 390         info = {}
 391         for field in ('cover_url', 'cover_by', 'cover_source'):
 392             val = self.extra_info.get(field)
 393             if val:
 394                 info[field] = val
 395             else:
 396                 need = True
 397         if inherit and need and self.parent is not None:
 398             parent_info = self.parent.cover_info()
 399             parent_info.update(info)
 400             info = parent_info
 401         return info
 402
 403     def parent_cover_changed(self):
 404         """Called when parent book's cover image is changed."""
 405         if not self.cover_info(inherit=False):
 406             if 'cover' not in app_settings.DONT_BUILD:
 407                 self.cover.build_delay()
 408                 self.cover_thumb.build_delay()
 409             for format_ in constants.EBOOK_FORMATS_WITH_COVERS:
 410                 if format_ not in app_settings.DONT_BUILD:
 411                     getattr(self, '%s_file' % format_).build_delay()
 412             for child in self.children.all():
 413                 child.parent_cover_changed()
 414
 415     def other_versions(self):
 416         """Find other versions (i.e. in other languages) of the book."""
 417         return type(self).objects.filter(common_slug=self.common_slug).exclude(pk=self.pk)
 418
 419     def related_info(self):
 420         """Keeps info about related objects (tags, media) in cache field."""
 421         if self._related_info is not None:
 422             return self._related_info
 423         else:
 424             rel = {'tags': {}, 'media': {}}
 425
 426             tags = self.tags.filter(category__in=(
 427                     'author', 'kind', 'genre', 'epoch'))
 428             tags = split_tags(tags)
 429             for category in tags:
 430                 cat = []
 431                 for tag in tags[category]:
 432                     tag_info = {'slug': tag.slug, 'name': tag.name}
 433                     for lc, ln in settings.LANGUAGES:
 434                         tag_name = getattr(tag, "name_%s" % lc)
 435                         if tag_name:
 436                             tag_info["name_%s" % lc] = tag_name
 437                     cat.append(tag_info)
 438                 rel['tags'][category] = cat
 439
 440             for media_format in BookMedia.formats:
 441                 rel['media'][media_format] = self.has_media(media_format)
 442
 443             book = self
 444             parents = []
 445             while book.parent:
 446                 parents.append((book.parent.title, book.parent.slug))
 447                 book = book.parent
 448             parents = parents[::-1]
 449             if parents:
 450                 rel['parents'] = parents
 451
 452             if self.pk:
 453                 type(self).objects.filter(pk=self.pk).update(_related_info=rel)
 454             return rel
 455
 456     def related_themes(self):
 457         theme_counter = self.theme_counter
 458         book_themes = list(Tag.objects.filter(pk__in=theme_counter.keys()))
 459         for tag in book_themes:
 460             tag.count = theme_counter[tag.pk]
 461         return book_themes
 462
 463     def reset_tag_counter(self):
 464         if self.id is None:
 465             return
 466
 467         cache_key = "Book.tag_counter/%d" % self.id
 468         permanent_cache.delete(cache_key)
 469         if self.parent:
 470             self.parent.reset_tag_counter()
 471
 472     @property
 473     def tag_counter(self):
 474         if self.id:
 475             cache_key = "Book.tag_counter/%d" % self.id
 476             tags = permanent_cache.get(cache_key)
 477         else:
 478             tags = None
 479
 480         if tags is None:
 481             tags = {}
 482             for child in self.children.all().order_by().iterator():
 483                 for tag_pk, value in child.tag_counter.iteritems():
 484                     tags[tag_pk] = tags.get(tag_pk, 0) + value
 485             for tag in self.tags.exclude(category__in=('book', 'theme', 'set')).order_by().iterator():
 486                 tags[tag.pk] = 1
 487
 488             if self.id:
 489                 permanent_cache.set(cache_key, tags)
 490         return tags
 491
 492     def reset_theme_counter(self):
 493         if self.id is None:
 494             return
 495
 496         cache_key = "Book.theme_counter/%d" % self.id
 497         permanent_cache.delete(cache_key)
 498         if self.parent:
 499             self.parent.reset_theme_counter()
 500
 501     @property
 502     def theme_counter(self):
 503         if self.id:
 504             cache_key = "Book.theme_counter/%d" % self.id
 505             tags = permanent_cache.get(cache_key)
 506         else:
 507             tags = None
 508
 509         if tags is None:
 510             tags = {}
 511             for fragment in Fragment.tagged.with_any([self.book_tag()]).order_by().iterator():
 512                 for tag in fragment.tags.filter(category='theme').order_by().iterator():
 513                     tags[tag.pk] = tags.get(tag.pk, 0) + 1
 514
 515             if self.id:
 516                 permanent_cache.set(cache_key, tags)
 517         return tags
 518
 519     def pretty_title(self, html_links=False):
 520         book = self
 521         rel_info = book.related_info()
 522         names = [(related_tag_name(tag), Tag.create_url('author', tag['slug']))
 523                     for tag in rel_info['tags'].get('author', ())]
 524         import logging
 525         logging.info("%s, %s" % (book.slug, unicode(rel_info['tags'].get('author', ()))))
 526         if 'parents' in rel_info:
 527             books = [(name, Book.create_url(slug))
 528                         for name, slug in rel_info['parents']]
 529             names.extend(reversed(books))
 530         names.append((self.title, self.get_absolute_url()))
 531
 532         if html_links:
 533             names = ['<a href="%s">%s</a>' % (tag[1], tag[0]) for tag in names]
 534         else:
 535             names = [tag[0] for tag in names]
 536         return ', '.join(names)
 537
 538     @classmethod
 539     def tagged_top_level(cls, tags):
 540         """ Returns top-level books tagged with `tags`.
 541
 542         It only returns those books which don't have ancestors which are
 543         also tagged with those tags.
 544
 545         """
 546         # get relevant books and their tags
 547         objects = cls.tagged.with_all(tags)
 548         parents = objects.exclude(children=None).only('slug')
 549         # eliminate descendants
 550         l_tags = Tag.objects.filter(category='book',
 551             slug__in=[book.book_tag_slug() for book in parents.iterator()])
 552         descendants_keys = [book.pk for book in cls.tagged.with_any(l_tags).only('pk').iterator()]
 553         if descendants_keys:
 554             objects = objects.exclude(pk__in=descendants_keys)
 555
 556         return objects
 557
 558     @classmethod
 559     def book_list(cls, filter=None):
 560         """Generates a hierarchical listing of all books.
 561
 562         Books are optionally filtered with a test function.
 563
 564         """
 565
 566         books_by_parent = {}
 567         books = cls.objects.all().order_by('parent_number', 'sort_key').only(
 568                 'title', 'parent', 'slug')
 569         if filter:
 570             books = books.filter(filter).distinct()
 571
 572             book_ids = set(b['pk'] for b in books.values("pk").iterator())
 573             for book in books.iterator():
 574                 parent = book.parent_id
 575                 if parent not in book_ids:
 576                     parent = None
 577                 books_by_parent.setdefault(parent, []).append(book)
 578         else:
 579             for book in books.iterator():
 580                 books_by_parent.setdefault(book.parent_id, []).append(book)
 581
 582         orphans = []
 583         books_by_author = SortedDict()
 584         for tag in Tag.objects.filter(category='author').iterator():
 585             books_by_author[tag] = []
 586
 587         for book in books_by_parent.get(None,()):
 588             authors = list(book.tags.filter(category='author'))
 589             if authors:
 590                 for author in authors:
 591                     books_by_author[author].append(book)
 592             else:
 593                 orphans.append(book)
 594
 595         return books_by_author, orphans, books_by_parent
 596
 597     _audiences_pl = {
 598         "SP": (1, u"szkoła podstawowa"),
 599         "SP1": (1, u"szkoła podstawowa"),
 600         "SP2": (1, u"szkoła podstawowa"),
 601         "P": (1, u"szkoła podstawowa"),
 602         "G": (2, u"gimnazjum"),
 603         "L": (3, u"liceum"),
 604         "LP": (3, u"liceum"),
 605     }
 606     def audiences_pl(self):
 607         audiences = self.extra_info.get('audiences', [])
 608         audiences = sorted(set([self._audiences_pl.get(a, (99, a)) for a in audiences]))
 609         return [a[1] for a in audiences]
 610
 611     def choose_fragment(self):
 612         tag = self.book_tag()
 613         fragments = Fragment.tagged.with_any([tag])
 614         if fragments.exists():
 615             return fragments.order_by('?')[0]
 616         elif self.parent:
 617             return self.parent.choose_fragment()
 618         else:
 619             return None
 620
 621
 622 # add the file fields
 623 for format_ in Book.formats:
 624     field_name = "%s_file" % format_
 625     EbookField(format_, _("%s file" % format_.upper()),
 626             upload_to=book_upload_path(format_),
 627             blank=True, default='').contribute_to_class(Book, field_name)