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