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