apps/catalogue/models/book.py

   1 # -*- coding: utf-8 -*-
   2 #
   3 # This file is part of FNP-Redakcja, licensed under GNU Affero GPLv3 or later.
   4 # Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information.
   5 #
   6 from django.contrib.sites.models import Site
   7 from django.db import models, transaction
   8 from django.template.loader import render_to_string
   9 from django.utils.translation import ugettext_lazy as _
  10 from django.conf import settings
  11 from slugify import slugify
  12
  13
  14 import apiclient
  15 from catalogue.helpers import cached_in_field, GalleryMerger
  16 from catalogue.models import BookPublishRecord, ChunkPublishRecord, Project
  17 from catalogue.signals import post_publish
  18 from catalogue.tasks import refresh_instance, book_content_updated
  19 from catalogue.xml_tools import compile_text, split_xml
  20 from cover.models import Image
  21 import os
  22 import shutil
  23 import re
  24
  25 class Book(models.Model):
  26     """ A document edited on the wiki """
  27
  28     title = models.CharField(_('title'), max_length=255, db_index=True)
  29     slug = models.SlugField(_('slug'), max_length=128, unique=True, db_index=True)
  30     public = models.BooleanField(_('public'), default=True, db_index=True)
  31     gallery = models.CharField(_('scan gallery name'), max_length=255, blank=True)
  32     project = models.ForeignKey(Project, null=True, blank=True)
  33
  34     #wl_slug = models.CharField(_('title'), max_length=255, null=True, db_index=True, editable=False)
  35     parent = models.ForeignKey('self', null=True, blank=True, verbose_name=_('parent'), related_name="children", editable=False)
  36     parent_number = models.IntegerField(_('parent number'), null=True, blank=True, db_index=True, editable=False)
  37
  38     # Cache
  39     _short_html = models.TextField(null=True, blank=True, editable=False)
  40     _single = models.NullBooleanField(editable=False, db_index=True)
  41     _new_publishable = models.NullBooleanField(editable=False)
  42     _published = models.NullBooleanField(editable=False)
  43     _on_track = models.IntegerField(null=True, blank=True, db_index=True, editable=False)
  44     dc_cover_image = models.ForeignKey(Image, blank=True, null=True,
  45         db_index=True, on_delete=models.SET_NULL, editable=False)
  46     dc_slug = models.CharField(max_length=128, null=True, blank=True,
  47             editable=False, db_index=True)
  48
  49     class NoTextError(BaseException):
  50         pass
  51
  52     class Meta:
  53         app_label = 'catalogue'
  54         ordering = ['title', 'slug']
  55         verbose_name = _('book')
  56         verbose_name_plural = _('books')
  57
  58
  59     # Representing
  60     # ============
  61
  62     def __iter__(self):
  63         return iter(self.chunk_set.all())
  64
  65     def __getitem__(self, chunk):
  66         return self.chunk_set.all()[chunk]
  67
  68     def __len__(self):
  69         return self.chunk_set.count()
  70
  71     def __nonzero__(self):
  72         """
  73             Necessary so that __len__ isn't used for bool evaluation.
  74         """
  75         return True
  76
  77     def __unicode__(self):
  78         return self.title
  79
  80     @models.permalink
  81     def get_absolute_url(self):
  82         return ("catalogue_book", [self.slug])
  83
  84     def correct_about(self):
  85         return "http://%s%s" % (
  86             Site.objects.get_current().domain,
  87             self.get_absolute_url()
  88         )
  89
  90     def gallery_path(self):
  91         return os.path.join(settings.MEDIA_ROOT, settings.IMAGE_DIR, self.gallery)
  92
  93     def gallery_url(self):
  94         return '%s%s%s/' % (settings.MEDIA_URL, settings.IMAGE_DIR, self.gallery)
  95
  96     # Creating & manipulating
  97     # =======================
  98
  99     def accessible(self, request):
 100         return self.public or request.user.is_authenticated()
 101
 102     @classmethod
 103     @transaction.atomic
 104     def create(cls, creator, text, *args, **kwargs):
 105         b = cls.objects.create(*args, **kwargs)
 106         b.chunk_set.all().update(creator=creator)
 107         b[0].commit(text, author=creator)
 108         return b
 109
 110     def add(self, *args, **kwargs):
 111         """Add a new chunk at the end."""
 112         return self.chunk_set.reverse()[0].split(*args, **kwargs)
 113
 114     @classmethod
 115     @transaction.atomic
 116     def import_xml_text(cls, text=u'', previous_book=None,
 117                 commit_args=None, **kwargs):
 118         """Imports a book from XML, splitting it into chunks as necessary."""
 119         texts = split_xml(text)
 120         if previous_book:
 121             instance = previous_book
 122         else:
 123             instance = cls(**kwargs)
 124             instance.save()
 125
 126         # if there are more parts, set the rest to empty strings
 127         book_len = len(instance)
 128         for i in range(book_len - len(texts)):
 129             texts.append((u'pusta część %d' % (i + 1), u''))
 130
 131         i = 0
 132         for i, (title, text) in enumerate(texts):
 133             if not title:
 134                 title = u'część %d' % (i + 1)
 135
 136             slug = slugify(title)
 137
 138             if i < book_len:
 139                 chunk = instance[i]
 140                 chunk.slug = slug[:50]
 141                 chunk.title = title[:255]
 142                 chunk.save()
 143             else:
 144                 chunk = instance.add(slug, title)
 145
 146             chunk.commit(text, **commit_args)
 147
 148         return instance
 149
 150     def make_chunk_slug(self, proposed):
 151         """
 152             Finds a chunk slug not yet used in the book.
 153         """
 154         slugs = set(c.slug for c in self)
 155         i = 1
 156         new_slug = proposed[:50]
 157         while new_slug in slugs:
 158             new_slug = "%s_%d" % (proposed[:45], i)
 159             i += 1
 160         return new_slug
 161
 162     @transaction.atomic
 163     def append(self, other, slugs=None, titles=None):
 164         """Add all chunks of another book to self."""
 165         assert self != other
 166
 167         number = self[len(self) - 1].number + 1
 168         len_other = len(other)
 169         single = len_other == 1
 170
 171         if slugs is not None:
 172             assert len(slugs) == len_other
 173         if titles is not None:
 174             assert len(titles) == len_other
 175             if slugs is None:
 176                 slugs = [slugify(t) for t in titles]
 177
 178         for i, chunk in enumerate(other):
 179             # move chunk to new book
 180             chunk.book = self
 181             chunk.number = number
 182
 183             if titles is None:
 184                 # try some title guessing
 185                 if other.title.startswith(self.title):
 186                     other_title_part = other.title[len(self.title):].lstrip(' /')
 187                 else:
 188                     other_title_part = other.title
 189
 190                 if single:
 191                     # special treatment for appending one-parters:
 192                     # just use the guessed title and original book slug
 193                     chunk.title = other_title_part
 194                     if other.slug.startswith(self.slug):
 195                         chunk.slug = other.slug[len(self.slug):].lstrip('-_')
 196                     else:
 197                         chunk.slug = other.slug
 198                 else:
 199                     chunk.title = ("%s, %s" % (other_title_part, chunk.title))[:255]
 200             else:
 201                 chunk.slug = slugs[i]
 202                 chunk.title = titles[i]
 203
 204             chunk.slug = self.make_chunk_slug(chunk.slug)
 205             chunk.save()
 206             number += 1
 207         assert not other.chunk_set.exists()
 208
 209         gm = GalleryMerger(self.gallery, other.gallery)
 210         self.gallery = gm.merge()
 211
 212         # and move the gallery starts
 213         if gm.was_merged:
 214                 for chunk in self[len(self) - len_other:]:
 215                         old_start = chunk.gallery_start or 1
 216                         chunk.gallery_start = old_start + gm.dest_size - gm.num_deleted
 217                         chunk.save()
 218
 219         other.delete()
 220
 221
 222     @transaction.atomic
 223     def prepend_history(self, other):
 224         """Prepend history from all the other book's chunks to own."""
 225         assert self != other
 226
 227         for i in range(len(self), len(other)):
 228             title = u"pusta część %d" % i
 229             chunk = self.add(slugify(title), title)
 230             chunk.commit('')
 231
 232         for i in range(len(other)):
 233             self[i].prepend_history(other[0])
 234
 235         assert not other.chunk_set.exists()
 236         other.delete()
 237
 238     def split(self):
 239         """Splits all the chunks into separate books."""
 240         self.title
 241         for chunk in self:
 242             book = Book.objects.create(title=chunk.title, slug=chunk.slug,
 243                     public=self.public, gallery=self.gallery)
 244             book[0].delete()
 245             chunk.book = book
 246             chunk.number = 1
 247             chunk.save()
 248         assert not self.chunk_set.exists()
 249         self.delete()
 250
 251     # State & cache
 252     # =============
 253
 254     def last_published(self):
 255         try:
 256             return self.publish_log.all()[0].timestamp
 257         except IndexError:
 258             return None
 259
 260     def assert_publishable(self):
 261         assert self.chunk_set.exists(), _('No chunks in the book.')
 262         try:
 263             changes = self.get_current_changes(publishable=True)
 264         except self.NoTextError:
 265             raise AssertionError(_('Not all chunks have publishable revisions.'))
 266
 267         from librarian import NoDublinCore, ParseError, ValidationError
 268
 269         try:
 270             bi = self.wldocument(changes=changes, strict=True).book_info
 271         except ParseError, e:
 272             raise AssertionError(_('Invalid XML') + ': ' + unicode(e))
 273         except NoDublinCore:
 274             raise AssertionError(_('No Dublin Core found.'))
 275         except ValidationError, e:
 276             raise AssertionError(_('Invalid Dublin Core') + ': ' + unicode(e))
 277
 278         valid_about = self.correct_about()
 279         assert bi.about == valid_about, _("rdf:about is not") + " " + valid_about
 280
 281     def publishable_error(self):
 282         try:
 283             return self.assert_publishable()
 284         except AssertionError, e:
 285             return e
 286         else:
 287             return None
 288
 289     def hidden(self):
 290         return self.slug.startswith('.')
 291
 292     def is_new_publishable(self):
 293         """Checks if book is ready for publishing.
 294
 295         Returns True if there is a publishable version newer than the one
 296         already published.
 297
 298         """
 299         new_publishable = False
 300         if not self.chunk_set.exists():
 301             return False
 302         for chunk in self:
 303             change = chunk.publishable()
 304             if not change:
 305                 return False
 306             if not new_publishable and not change.publish_log.exists():
 307                 new_publishable = True
 308         return new_publishable
 309     new_publishable = cached_in_field('_new_publishable')(is_new_publishable)
 310
 311     def is_published(self):
 312         return self.publish_log.exists()
 313     published = cached_in_field('_published')(is_published)
 314
 315     def get_on_track(self):
 316         if self.published:
 317             return -1
 318         stages = [ch.stage.ordering if ch.stage is not None else 0
 319                     for ch in self]
 320         if not len(stages):
 321             return 0
 322         return min(stages)
 323     on_track = cached_in_field('_on_track')(get_on_track)
 324
 325     def is_single(self):
 326         return len(self) == 1
 327     single = cached_in_field('_single')(is_single)
 328
 329     @cached_in_field('_short_html')
 330     def short_html(self):
 331         return render_to_string('catalogue/book_list/book.html', {'book': self})
 332
 333     def book_info(self, publishable=True):
 334         try:
 335             book_xml = self.materialize(publishable=publishable)
 336         except self.NoTextError:
 337             pass
 338         else:
 339             from librarian.dcparser import BookInfo
 340             from librarian import NoDublinCore, ParseError, ValidationError
 341             try:
 342                 return BookInfo.from_string(book_xml.encode('utf-8'))
 343             except (self.NoTextError, ParseError, NoDublinCore, ValidationError):
 344                 return None
 345
 346     def refresh_dc_cache(self):
 347         update = {
 348             'dc_slug': None,
 349             'dc_cover_image': None,
 350         }
 351
 352         info = self.book_info()
 353         if info is not None:
 354             update['dc_slug'] = info.url.slug
 355             if info.cover_source:
 356                 try:
 357                     image = Image.objects.get(pk=int(info.cover_source.rstrip('/').rsplit('/', 1)[-1]))
 358                 except:
 359                     pass
 360                 else:
 361                     if info.cover_source == image.get_full_url():
 362                         update['dc_cover_image'] = image
 363         Book.objects.filter(pk=self.pk).update(**update)
 364
 365     def touch(self):
 366         # this should only really be done when text or publishable status changes
 367         book_content_updated.delay(self)
 368
 369         update = {
 370             "_new_publishable": self.is_new_publishable(),
 371             "_published": self.is_published(),
 372             "_single": self.is_single(),
 373             "_on_track": self.get_on_track(),
 374             "_short_html": None,
 375         }
 376         Book.objects.filter(pk=self.pk).update(**update)
 377         refresh_instance(self)
 378
 379     def refresh(self):
 380         """This should be done offline."""
 381         self.short_html
 382         self.single
 383         self.new_publishable
 384         self.published
 385
 386     # Materializing & publishing
 387     # ==========================
 388
 389     def get_current_changes(self, publishable=True):
 390         """
 391             Returns a list containing one Change for every Chunk in the Book.
 392             Takes the most recent revision (publishable, if set).
 393             Throws an error, if a proper revision is unavailable for a Chunk.
 394         """
 395         if publishable:
 396             changes = [chunk.publishable() for chunk in self]
 397         else:
 398             changes = [chunk.head for chunk in self if chunk.head is not None]
 399         if None in changes:
 400             raise self.NoTextError('Some chunks have no available text.')
 401         return changes
 402
 403     def materialize(self, publishable=False, changes=None):
 404         """
 405             Get full text of the document compiled from chunks.
 406             Takes the current versions of all texts
 407             or versions most recently tagged for publishing,
 408             or a specified iterable changes.
 409         """
 410         if changes is None:
 411             changes = self.get_current_changes(publishable)
 412         return compile_text(change.materialize() for change in changes)
 413
 414     def wldocument(self, publishable=True, changes=None,
 415             parse_dublincore=True, strict=False):
 416         from catalogue.ebook_utils import RedakcjaDocProvider
 417         from librarian.parser import WLDocument
 418
 419         return WLDocument.from_string(
 420                 self.materialize(publishable=publishable, changes=changes),
 421                 provider=RedakcjaDocProvider(publishable=publishable),
 422                 parse_dublincore=parse_dublincore,
 423                 strict=strict)
 424
 425     def publish(self, user, fake=False, host=None):
 426         """
 427             Publishes a book on behalf of a (local) user.
 428         """
 429         self.assert_publishable()
 430         changes = self.get_current_changes(publishable=True)
 431         book_xml = self.materialize(changes=changes)
 432         if not fake:
 433             data = {"book_xml": book_xml}
 434             if host:
 435                 data['gallery_url'] = host + self.gallery_url()
 436             apiclient.api_call(user, "books/", data)
 437         # record the publish
 438         br = BookPublishRecord.objects.create(book=self, user=user)
 439         for c in changes:
 440             ChunkPublishRecord.objects.create(book_record=br, change=c)
 441         post_publish.send(sender=br)