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