src/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 from collections import OrderedDict
   6 from random import randint
   7 import re
   8 from django.conf import settings
   9 from django.db import connection, models, transaction
  10 from django.db.models import permalink
  11 import django.dispatch
  12 from django.contrib.contenttypes.fields import GenericRelation
  13 from django.core.urlresolvers import reverse
  14 from django.utils.translation import ugettext_lazy as _
  15 import jsonfield
  16 from fnpdjango.storage import BofhFileSystemStorage
  17 from ssify import flush_ssi_includes
  18 from newtagging import managers
  19 from catalogue import constants
  20 from catalogue.fields import EbookField
  21 from catalogue.models import Tag, Fragment, BookMedia
  22 from catalogue.utils import create_zip
  23 from catalogue import app_settings
  24 from catalogue import tasks
  25
  26 bofh_storage = BofhFileSystemStorage()
  27
  28
  29 def _make_upload_to(path):
  30     def _upload_to(i, n):
  31         return path % i.slug
  32     return _upload_to
  33
  34
  35 _cover_upload_to = _make_upload_to('book/cover/%s.jpg')
  36 _cover_thumb_upload_to = _make_upload_to('book/cover_thumb/%s.jpg')
  37
  38
  39 def _ebook_upload_to(upload_path):
  40     return _make_upload_to(upload_path)
  41
  42
  43 class Book(models.Model):
  44     """Represents a book imported from WL-XML."""
  45     title = models.CharField(_('title'), max_length=32767)
  46     sort_key = models.CharField(_('sort key'), max_length=120, db_index=True, editable=False)
  47     sort_key_author = models.CharField(
  48         _('sort key by author'), max_length=120, db_index=True, editable=False, default=u'')
  49     slug = models.SlugField(_('slug'), max_length=120, db_index=True, unique=True)
  50     common_slug = models.SlugField(_('slug'), max_length=120, db_index=True)
  51     language = models.CharField(_('language code'), max_length=3, db_index=True, default=app_settings.DEFAULT_LANGUAGE)
  52     description = models.TextField(_('description'), blank=True)
  53     created_at = models.DateTimeField(_('creation date'), auto_now_add=True, db_index=True)
  54     changed_at = models.DateTimeField(_('creation date'), auto_now=True, db_index=True)
  55     parent_number = models.IntegerField(_('parent number'), default=0)
  56     extra_info = jsonfield.JSONField(_('extra information'), default={})
  57     gazeta_link = models.CharField(blank=True, max_length=240)
  58     wiki_link = models.CharField(blank=True, max_length=240)
  59
  60     # files generated during publication
  61     cover = EbookField(
  62         'cover', _('cover'),
  63         null=True, blank=True,
  64         upload_to=_cover_upload_to,
  65         storage=bofh_storage, max_length=255)
  66     # Cleaner version of cover for thumbs
  67     cover_thumb = EbookField(
  68         'cover_thumb', _('cover thumbnail'),
  69         null=True, blank=True,
  70         upload_to=_cover_thumb_upload_to,
  71         max_length=255)
  72     ebook_formats = constants.EBOOK_FORMATS
  73     formats = ebook_formats + ['html', 'xml']
  74
  75     parent = models.ForeignKey('self', blank=True, null=True, related_name='children')
  76     ancestor = models.ManyToManyField('self', blank=True, editable=False, related_name='descendant', symmetrical=False)
  77
  78     objects = models.Manager()
  79     tagged = managers.ModelTaggedItemManager(Tag)
  80     tags = managers.TagDescriptor(Tag)
  81     tag_relations = GenericRelation(Tag.intermediary_table_model)
  82
  83     html_built = django.dispatch.Signal()
  84     published = django.dispatch.Signal()
  85
  86     short_html_url_name = 'catalogue_book_short'
  87
  88     class AlreadyExists(Exception):
  89         pass
  90
  91     class Meta:
  92         ordering = ('sort_key',)
  93         verbose_name = _('book')
  94         verbose_name_plural = _('books')
  95         app_label = 'catalogue'
  96
  97     def __unicode__(self):
  98         return self.title
  99
 100     def get_initial(self):
 101         try:
 102             return re.search(r'\w', self.title, re.U).group(0)
 103         except AttributeError:
 104             return ''
 105
 106     def author_str(self):
 107         return ", ".join(str(t) for t in self.tags.filter(category='author'))
 108
 109     def save(self, force_insert=False, force_update=False, **kwargs):
 110         from sortify import sortify
 111
 112         self.sort_key = sortify(self.title)[:120]
 113         self.title = unicode(self.title)  # ???
 114
 115         try:
 116             author = self.tags.filter(category='author')[0].sort_key
 117         except IndexError:
 118             author = u''
 119         self.sort_key_author = author
 120
 121         ret = super(Book, self).save(force_insert, force_update, **kwargs)
 122
 123         return ret
 124
 125     @permalink
 126     def get_absolute_url(self):
 127         return 'catalogue.views.book_detail', [self.slug]
 128
 129     @staticmethod
 130     @permalink
 131     def create_url(slug):
 132         return 'catalogue.views.book_detail', [slug]
 133
 134     @property
 135     def name(self):
 136         return self.title
 137
 138     def language_code(self):
 139         return constants.LANGUAGES_3TO2.get(self.language, self.language)
 140
 141     def language_name(self):
 142         return dict(settings.LANGUAGES).get(self.language_code(), "")
 143
 144     def has_media(self, type_):
 145         if type_ in Book.formats:
 146             return bool(getattr(self, "%s_file" % type_))
 147         else:
 148             return self.media.filter(type=type_).exists()
 149
 150     def get_media(self, type_):
 151         if self.has_media(type_):
 152             if type_ in Book.formats:
 153                 return getattr(self, "%s_file" % type_)
 154             else:
 155                 return self.media.filter(type=type_)
 156         else:
 157             return None
 158
 159     def get_mp3(self):
 160         return self.get_media("mp3")
 161
 162     def get_odt(self):
 163         return self.get_media("odt")
 164
 165     def get_ogg(self):
 166         return self.get_media("ogg")
 167
 168     def get_daisy(self):
 169         return self.get_media("daisy")
 170
 171     def has_description(self):
 172         return len(self.description) > 0
 173     has_description.short_description = _('description')
 174     has_description.boolean = True
 175
 176     # ugly ugly ugly
 177     def has_mp3_file(self):
 178         return bool(self.has_media("mp3"))
 179     has_mp3_file.short_description = 'MP3'
 180     has_mp3_file.boolean = True
 181
 182     def has_ogg_file(self):
 183         return bool(self.has_media("ogg"))
 184     has_ogg_file.short_description = 'OGG'
 185     has_ogg_file.boolean = True
 186
 187     def has_daisy_file(self):
 188         return bool(self.has_media("daisy"))
 189     has_daisy_file.short_description = 'DAISY'
 190     has_daisy_file.boolean = True
 191
 192     def wldocument(self, parse_dublincore=True, inherit=True):
 193         from catalogue.import_utils import ORMDocProvider
 194         from librarian.parser import WLDocument
 195
 196         if inherit and self.parent:
 197             meta_fallbacks = self.parent.cover_info()
 198         else:
 199             meta_fallbacks = None
 200
 201         return WLDocument.from_file(
 202             self.xml_file.path,
 203             provider=ORMDocProvider(self),
 204             parse_dublincore=parse_dublincore,
 205             meta_fallbacks=meta_fallbacks)
 206
 207     @staticmethod
 208     def zip_format(format_):
 209         def pretty_file_name(book):
 210             return "%s/%s.%s" % (
 211                 book.extra_info['author'],
 212                 book.slug,
 213                 format_)
 214
 215         field_name = "%s_file" % format_
 216         books = Book.objects.filter(parent=None).exclude(**{field_name: ""})
 217         paths = [(pretty_file_name(b), getattr(b, field_name).path) for b in books.iterator()]
 218         return create_zip(paths, app_settings.FORMAT_ZIPS[format_])
 219
 220     def zip_audiobooks(self, format_):
 221         bm = BookMedia.objects.filter(book=self, type=format_)
 222         paths = map(lambda bm: (None, bm.file.path), bm)
 223         return create_zip(paths, "%s_%s" % (self.slug, format_))
 224
 225     def search_index(self, book_info=None, index=None, index_tags=True, commit=True):
 226         if index is None:
 227             from search.index import Index
 228             index = Index()
 229         try:
 230             index.index_book(self, book_info)
 231             if index_tags:
 232                 index.index_tags()
 233             if commit:
 234                 index.index.commit()
 235         except Exception, e:
 236             index.index.rollback()
 237             raise e
 238
 239     @classmethod
 240     def from_xml_file(cls, xml_file, **kwargs):
 241         from django.core.files import File
 242         from librarian import dcparser
 243
 244         # use librarian to parse meta-data
 245         book_info = dcparser.parse(xml_file)
 246
 247         if not isinstance(xml_file, File):
 248             xml_file = File(open(xml_file))
 249
 250         try:
 251             return cls.from_text_and_meta(xml_file, book_info, **kwargs)
 252         finally:
 253             xml_file.close()
 254
 255     @classmethod
 256     def from_text_and_meta(cls, raw_file, book_info, overwrite=False, dont_build=None, search_index=True,
 257                            search_index_tags=True):
 258         if dont_build is None:
 259             dont_build = set()
 260         dont_build = set.union(set(dont_build), set(app_settings.DONT_BUILD))
 261
 262         # check for parts before we do anything
 263         children = []
 264         if hasattr(book_info, 'parts'):
 265             for part_url in book_info.parts:
 266                 try:
 267                     children.append(Book.objects.get(slug=part_url.slug))
 268                 except Book.DoesNotExist:
 269                     raise Book.DoesNotExist(_('Book "%s" does not exist.') % part_url.slug)
 270
 271         # Read book metadata
 272         book_slug = book_info.url.slug
 273         if re.search(r'[^a-z0-9-]', book_slug):
 274             raise ValueError('Invalid characters in slug')
 275         book, created = Book.objects.get_or_create(slug=book_slug)
 276
 277         if created:
 278             book_shelves = []
 279             old_cover = None
 280         else:
 281             if not overwrite:
 282                 raise Book.AlreadyExists(_('Book %s already exists') % book_slug)
 283             # Save shelves for this book
 284             book_shelves = list(book.tags.filter(category='set'))
 285             old_cover = book.cover_info()
 286
 287         # Save XML file
 288         book.xml_file.save('%s.xml' % book.slug, raw_file, save=False)
 289
 290         book.language = book_info.language
 291         book.title = book_info.title
 292         if book_info.variant_of:
 293             book.common_slug = book_info.variant_of.slug
 294         else:
 295             book.common_slug = book.slug
 296         book.extra_info = book_info.to_dict()
 297         book.save()
 298
 299         meta_tags = Tag.tags_from_info(book_info)
 300
 301         book.tags = set(meta_tags + book_shelves)
 302
 303         cover_changed = old_cover != book.cover_info()
 304         obsolete_children = set(b for b in book.children.all()
 305                                 if b not in children)
 306         notify_cover_changed = []
 307         for n, child_book in enumerate(children):
 308             new_child = child_book.parent != book
 309             child_book.parent = book
 310             child_book.parent_number = n
 311             child_book.save()
 312             if new_child or cover_changed:
 313                 notify_cover_changed.append(child_book)
 314         # Disown unfaithful children and let them cope on their own.
 315         for child in obsolete_children:
 316             child.parent = None
 317             child.parent_number = 0
 318             child.save()
 319             if old_cover:
 320                 notify_cover_changed.append(child)
 321
 322         cls.repopulate_ancestors()
 323         tasks.update_counters.delay()
 324
 325         # No saves beyond this point.
 326
 327         # Build cover.
 328         if 'cover' not in dont_build:
 329             book.cover.build_delay()
 330             book.cover_thumb.build_delay()
 331
 332         # Build HTML and ebooks.
 333         book.html_file.build_delay()
 334         if not children:
 335             for format_ in constants.EBOOK_FORMATS_WITHOUT_CHILDREN:
 336                 if format_ not in dont_build:
 337                     getattr(book, '%s_file' % format_).build_delay()
 338         for format_ in constants.EBOOK_FORMATS_WITH_CHILDREN:
 339             if format_ not in dont_build:
 340                 getattr(book, '%s_file' % format_).build_delay()
 341
 342         if not settings.NO_SEARCH_INDEX and search_index:
 343             tasks.index_book.delay(book.id, book_info=book_info, index_tags=search_index_tags)
 344
 345         for child in notify_cover_changed:
 346             child.parent_cover_changed()
 347
 348         cls.published.send(sender=cls, instance=book)
 349         return book
 350
 351     @classmethod
 352     @transaction.atomic
 353     def repopulate_ancestors(cls):
 354         """Fixes the ancestry cache."""
 355         # TODO: table names
 356         cursor = connection.cursor()
 357         if connection.vendor == 'postgres':
 358             cursor.execute("TRUNCATE catalogue_book_ancestor")
 359             cursor.execute("""
 360                 WITH RECURSIVE ancestry AS (
 361                     SELECT book.id, book.parent_id
 362                     FROM catalogue_book AS book
 363                     WHERE book.parent_id IS NOT NULL
 364                     UNION
 365                     SELECT ancestor.id, book.parent_id
 366                     FROM ancestry AS ancestor, catalogue_book AS book
 367                     WHERE ancestor.parent_id = book.id
 368                         AND book.parent_id IS NOT NULL
 369                     )
 370                 INSERT INTO catalogue_book_ancestor
 371                     (from_book_id, to_book_id)
 372                     SELECT id, parent_id
 373                     FROM ancestry
 374                     ORDER BY id;
 375                 """)
 376         else:
 377             cursor.execute("DELETE FROM catalogue_book_ancestor")
 378             for b in cls.objects.exclude(parent=None):
 379                 parent = b.parent
 380                 while parent is not None:
 381                     b.ancestor.add(parent)
 382                     parent = parent.parent
 383
 384     def flush_includes(self, languages=True):
 385         if not languages:
 386             return
 387         if languages is True:
 388             languages = [lc for (lc, _ln) in settings.LANGUAGES]
 389         flush_ssi_includes([
 390             template % (self.pk, lang)
 391             for template in [
 392                 '/katalog/b/%d/mini.%s.html',
 393                 '/katalog/b/%d/mini_nolink.%s.html',
 394                 '/katalog/b/%d/short.%s.html',
 395                 '/katalog/b/%d/wide.%s.html',
 396                 '/api/include/book/%d.%s.json',
 397                 '/api/include/book/%d.%s.xml',
 398                 ]
 399             for lang in languages
 400             ])
 401
 402     def cover_info(self, inherit=True):
 403         """Returns a dictionary to serve as fallback for BookInfo.
 404
 405         For now, the only thing inherited is the cover image.
 406         """
 407         need = False
 408         info = {}
 409         for field in ('cover_url', 'cover_by', 'cover_source'):
 410             val = self.extra_info.get(field)
 411             if val:
 412                 info[field] = val
 413             else:
 414                 need = True
 415         if inherit and need and self.parent is not None:
 416             parent_info = self.parent.cover_info()
 417             parent_info.update(info)
 418             info = parent_info
 419         return info
 420
 421     def related_themes(self):
 422         return Tag.objects.usage_for_queryset(
 423             Fragment.objects.filter(models.Q(book=self) | models.Q(book__ancestor=self)),
 424             counts=True).filter(category='theme')
 425
 426     def parent_cover_changed(self):
 427         """Called when parent book's cover image is changed."""
 428         if not self.cover_info(inherit=False):
 429             if 'cover' not in app_settings.DONT_BUILD:
 430                 self.cover.build_delay()
 431                 self.cover_thumb.build_delay()
 432             for format_ in constants.EBOOK_FORMATS_WITH_COVERS:
 433                 if format_ not in app_settings.DONT_BUILD:
 434                     getattr(self, '%s_file' % format_).build_delay()
 435             for child in self.children.all():
 436                 child.parent_cover_changed()
 437
 438     def other_versions(self):
 439         """Find other versions (i.e. in other languages) of the book."""
 440         return type(self).objects.filter(common_slug=self.common_slug).exclude(pk=self.pk)
 441
 442     def parents(self):
 443         books = []
 444         parent = self.parent
 445         while parent is not None:
 446             books.insert(0, parent)
 447             parent = parent.parent
 448         return books
 449
 450     def pretty_title(self, html_links=False):
 451         names = [(tag.name, tag.get_absolute_url()) for tag in self.tags.filter(category='author')]
 452         books = self.parents() + [self]
 453         names.extend([(b.title, b.get_absolute_url()) for b in books])
 454
 455         if html_links:
 456             names = ['<a href="%s">%s</a>' % (tag[1], tag[0]) for tag in names]
 457         else:
 458             names = [tag[0] for tag in names]
 459         return ', '.join(names)
 460
 461     @classmethod
 462     def tagged_top_level(cls, tags):
 463         """ Returns top-level books tagged with `tags`.
 464
 465         It only returns those books which don't have ancestors which are
 466         also tagged with those tags.
 467
 468         """
 469         objects = cls.tagged.with_all(tags)
 470         return objects.exclude(ancestor__in=objects)
 471
 472     @classmethod
 473     def book_list(cls, book_filter=None):
 474         """Generates a hierarchical listing of all books.
 475
 476         Books are optionally filtered with a test function.
 477
 478         """
 479
 480         books_by_parent = {}
 481         books = cls.objects.all().order_by('parent_number', 'sort_key').only(
 482                 'title', 'parent', 'slug')
 483         if book_filter:
 484             books = books.filter(book_filter).distinct()
 485
 486             book_ids = set(b['pk'] for b in books.values("pk").iterator())
 487             for book in books.iterator():
 488                 parent = book.parent_id
 489                 if parent not in book_ids:
 490                     parent = None
 491                 books_by_parent.setdefault(parent, []).append(book)
 492         else:
 493             for book in books.iterator():
 494                 books_by_parent.setdefault(book.parent_id, []).append(book)
 495
 496         orphans = []
 497         books_by_author = OrderedDict()
 498         for tag in Tag.objects.filter(category='author').iterator():
 499             books_by_author[tag] = []
 500
 501         for book in books_by_parent.get(None, ()):
 502             authors = list(book.tags.filter(category='author'))
 503             if authors:
 504                 for author in authors:
 505                     books_by_author[author].append(book)
 506             else:
 507                 orphans.append(book)
 508
 509         return books_by_author, orphans, books_by_parent
 510
 511     _audiences_pl = {
 512         "SP": (1, u"szkoła podstawowa"),
 513         "SP1": (1, u"szkoła podstawowa"),
 514         "SP2": (1, u"szkoła podstawowa"),
 515         "P": (1, u"szkoła podstawowa"),
 516         "G": (2, u"gimnazjum"),
 517         "L": (3, u"liceum"),
 518         "LP": (3, u"liceum"),
 519     }
 520
 521     def audiences_pl(self):
 522         audiences = self.extra_info.get('audiences', [])
 523         audiences = sorted(set([self._audiences_pl.get(a, (99, a)) for a in audiences]))
 524         return [a[1] for a in audiences]
 525
 526     def stage_note(self):
 527         stage = self.extra_info.get('stage')
 528         if stage and stage < '0.4':
 529             return (_('This work needs modernisation'),
 530                     reverse('infopage', args=['wymagajace-uwspolczesnienia']))
 531         else:
 532             return None, None
 533
 534     def choose_fragment(self):
 535         fragments = self.fragments.order_by()
 536         fragments_count = fragments.count()
 537         if not fragments_count and self.children.exists():
 538             fragments = Fragment.objects.filter(book__ancestor=self).order_by()
 539             fragments_count = fragments.count()
 540         if fragments_count:
 541             return fragments[randint(0, fragments_count - 1)]
 542         elif self.parent:
 543             return self.parent.choose_fragment()
 544         else:
 545             return None
 546
 547
 548 def add_file_fields():
 549     for format_ in Book.formats:
 550         field_name = "%s_file" % format_
 551         # This weird globals() assignment makes Django migrations comfortable.
 552         _upload_to = _ebook_upload_to('book/%s/%%s.%s' % (format_, format_))
 553         _upload_to.__name__ = '_%s_upload_to' % format_
 554         globals()[_upload_to.__name__] = _upload_to
 555
 556         EbookField(
 557             format_, _("%s file" % format_.upper()),
 558             upload_to=_upload_to,
 559             storage=bofh_storage,
 560             max_length=255,
 561             blank=True,
 562             default=''
 563         ).contribute_to_class(Book, field_name)
 564
 565 add_file_fields()