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