src/picture/models.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 django.db import models, transaction
   6 import catalogue.models
   7 from django.db.models import permalink
   8 from sorl.thumbnail import ImageField
   9 from django.conf import settings
  10 from django.contrib.contenttypes.fields import GenericRelation
  11 from django.core.files.storage import FileSystemStorage
  12 from django.utils.datastructures import SortedDict
  13 from fnpdjango.utils.text.slughifi import slughifi
  14 from ssify import flush_ssi_includes
  15 from picture import tasks
  16 from StringIO import StringIO
  17 import jsonfield
  18 import itertools
  19 import logging
  20 import re
  21
  22 from PIL import Image
  23
  24 from django.utils.translation import ugettext_lazy as _
  25 from newtagging import managers
  26 from os import path
  27
  28
  29 picture_storage = FileSystemStorage(location=path.join(
  30         settings.MEDIA_ROOT, 'pictures'),
  31         base_url=settings.MEDIA_URL + "pictures/")
  32
  33
  34 class PictureArea(models.Model):
  35     picture = models.ForeignKey('picture.Picture', related_name='areas')
  36     area = jsonfield.JSONField(_('area'), default={}, editable=False)
  37     kind = models.CharField(
  38         _('kind'), max_length=10, blank=False, null=False, db_index=True,
  39         choices=(('thing', _('thing')), ('theme', _('theme'))))
  40
  41     objects = models.Manager()
  42     tagged = managers.ModelTaggedItemManager(catalogue.models.Tag)
  43     tags = managers.TagDescriptor(catalogue.models.Tag)
  44     tag_relations = GenericRelation(catalogue.models.Tag.intermediary_table_model)
  45
  46     short_html_url_name = 'picture_area_short'
  47
  48     @classmethod
  49     def rectangle(cls, picture, kind, coords):
  50         pa = PictureArea()
  51         pa.picture = picture
  52         pa.kind = kind
  53         pa.area = coords
  54         return pa
  55
  56     def flush_includes(self, languages=True):
  57         if not languages:
  58             return
  59         if languages is True:
  60             languages = [lc for (lc, _ln) in settings.LANGUAGES]
  61         flush_ssi_includes([
  62             template % (self.pk, lang)
  63             for template in [
  64                 '/katalog/pa/%d/short.%s.html',
  65                 ]
  66             for lang in languages
  67             ])
  68
  69
  70 class Picture(models.Model):
  71     """
  72     Picture resource.
  73
  74     """
  75     title = models.CharField(_('title'), max_length=32767)
  76     slug = models.SlugField(_('slug'), max_length=120, db_index=True, unique=True)
  77     sort_key = models.CharField(_('sort key'), max_length=120, db_index=True, editable=False)
  78     sort_key_author = models.CharField(
  79         _('sort key by author'), max_length=120, db_index=True, editable=False, default=u'')
  80     created_at = models.DateTimeField(_('creation date'), auto_now_add=True, db_index=True)
  81     changed_at = models.DateTimeField(_('creation date'), auto_now=True, db_index=True)
  82     xml_file = models.FileField(_('xml file'), upload_to="xml", storage=picture_storage)
  83     image_file = ImageField(_('image file'), upload_to="images", storage=picture_storage)
  84     html_file = models.FileField(_('html file'), upload_to="html", storage=picture_storage)
  85     areas_json = jsonfield.JSONField(_('picture areas JSON'), default={}, editable=False)
  86     extra_info = jsonfield.JSONField(_('extra information'), default={})
  87     culturepl_link = models.CharField(blank=True, max_length=240)
  88     wiki_link = models.CharField(blank=True, max_length=240)
  89
  90     width = models.IntegerField(null=True)
  91     height = models.IntegerField(null=True)
  92
  93     objects = models.Manager()
  94     tagged = managers.ModelTaggedItemManager(catalogue.models.Tag)
  95     tags = managers.TagDescriptor(catalogue.models.Tag)
  96     tag_relations = GenericRelation(catalogue.models.Tag.intermediary_table_model)
  97
  98     short_html_url_name = 'picture_short'
  99
 100     class AlreadyExists(Exception):
 101         pass
 102
 103     class Meta:
 104         ordering = ('sort_key',)
 105
 106         verbose_name = _('picture')
 107         verbose_name_plural = _('pictures')
 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
 114         try:
 115             author = self.tags.filter(category='author')[0].sort_key
 116         except IndexError:
 117             author = u''
 118         self.sort_key_author = author
 119
 120         ret = super(Picture, self).save(force_insert, force_update)
 121
 122         return ret
 123
 124     def __unicode__(self):
 125         return self.title
 126
 127     def author_str(self):
 128         return ", ".join(str(t) for t in self.tags.filter(category='author'))
 129
 130     def author_unicode(self):
 131         return ", ".join(unicode(t) for t in self.tags.filter(category='author'))
 132
 133     @permalink
 134     def get_absolute_url(self):
 135         return 'picture.views.picture_detail', [self.slug]
 136
 137     def get_initial(self):
 138         try:
 139             return re.search(r'\w', self.title, re.U).group(0)
 140         except AttributeError:
 141             return ''
 142
 143     def get_next(self):
 144         try:
 145             return type(self).objects.filter(sort_key__gt=self.sort_key)[0]
 146         except IndexError:
 147             return None
 148
 149     def get_previous(self):
 150         try:
 151             return type(self).objects.filter(sort_key__lt=self.sort_key).order_by('-sort_key')[0]
 152         except IndexError:
 153             return None
 154
 155     @classmethod
 156     def from_xml_file(cls, xml_file, image_file=None, image_store=None, overwrite=False):
 157         """
 158         Import xml and it's accompanying image file.
 159         If image file is missing, it will be fetched by librarian.picture.ImageStore
 160         which looks for an image file in the same directory the xml is, with extension matching
 161         its mime type.
 162         """
 163         from sortify import sortify
 164         from django.core.files import File
 165         from librarian.picture import WLPicture, ImageStore
 166         close_xml_file = False
 167         close_image_file = False
 168
 169         if image_file is not None and not isinstance(image_file, File):
 170             image_file = File(open(image_file))
 171             close_image_file = True
 172
 173         if not isinstance(xml_file, File):
 174             xml_file = File(open(xml_file))
 175             close_xml_file = True
 176
 177         with transaction.atomic():
 178             # use librarian to parse meta-data
 179             if image_store is None:
 180                 image_store = ImageStore(picture_storage.path('images'))
 181             picture_xml = WLPicture.from_file(xml_file, image_store=image_store)
 182
 183             picture, created = Picture.objects.get_or_create(slug=picture_xml.slug[:120])
 184             if not created and not overwrite:
 185                 raise Picture.AlreadyExists('Picture %s already exists' % picture_xml.slug)
 186
 187             picture.areas.all().delete()
 188             picture.title = unicode(picture_xml.picture_info.title)
 189             picture.extra_info = picture_xml.picture_info.to_dict()
 190
 191             picture_tags = set(catalogue.models.Tag.tags_from_info(picture_xml.picture_info))
 192             motif_tags = set()
 193             thing_tags = set()
 194
 195             area_data = {'themes': {}, 'things': {}}
 196
 197             # Treat all names in picture XML as in default language.
 198             lang = settings.LANGUAGE_CODE
 199
 200             for part in picture_xml.partiter():
 201                 if picture_xml.frame:
 202                     c = picture_xml.frame[0]
 203                     part['coords'] = [[p[0] - c[0], p[1] - c[1]] for p in part['coords']]
 204                 if part.get('object', None) is not None:
 205                     _tags = set()
 206                     for objname in part['object'].split(','):
 207                         objname = objname.strip().capitalize()
 208                         tag, created = catalogue.models.Tag.objects.get_or_create(
 209                             slug=slughifi(objname), category='thing')
 210                         if created:
 211                             tag.name = objname
 212                             setattr(tag, 'name_%s' % lang, tag.name)
 213                             tag.sort_key = sortify(tag.name)
 214                             tag.save()
 215                         # thing_tags.add(tag)
 216                         area_data['things'][tag.slug] = {
 217                             'object': objname,
 218                             'coords': part['coords'],
 219                             }
 220
 221                         _tags.add(tag)
 222                     area = PictureArea.rectangle(picture, 'thing', part['coords'])
 223                     area.save()
 224                     area.tags = _tags
 225                 else:
 226                     _tags = set()
 227                     for motifs in part['themes']:
 228                         for motif in motifs.split(','):
 229                             tag, created = catalogue.models.Tag.objects.get_or_create(
 230                                 slug=slughifi(motif), category='theme')
 231                             if created:
 232                                 tag.name = motif
 233                                 tag.sort_key = sortify(tag.name)
 234                                 tag.save()
 235                             # motif_tags.add(tag)
 236                             _tags.add(tag)
 237                             area_data['themes'][tag.slug] = {
 238                                 'theme': motif,
 239                                 'coords': part['coords']
 240                                 }
 241
 242                     logging.debug("coords for theme: %s" % part['coords'])
 243                     area = PictureArea.rectangle(picture, 'theme', part['coords'])
 244                     area.save()
 245                     area.tags = _tags.union(picture_tags)
 246
 247             picture.tags = picture_tags.union(motif_tags).union(thing_tags)
 248             picture.areas_json = area_data
 249
 250             if image_file is not None:
 251                 img = image_file
 252             else:
 253                 img = picture_xml.image_file()
 254
 255             modified = cls.crop_to_frame(picture_xml, img)
 256             modified = cls.add_source_note(picture_xml, modified)
 257
 258             picture.width, picture.height = modified.size
 259
 260             modified_file = StringIO()
 261             modified.save(modified_file, format='JPEG', quality=95)
 262             # FIXME: hardcoded extension - detect from DC format or orginal filename
 263             picture.image_file.save(path.basename(picture_xml.image_path), File(modified_file))
 264
 265             picture.xml_file.save("%s.xml" % picture.slug, File(xml_file))
 266             picture.save()
 267             tasks.generate_picture_html(picture.id)
 268
 269         if close_xml_file:
 270             xml_file.close()
 271         if close_image_file:
 272             image_file.close()
 273
 274         return picture
 275
 276     @classmethod
 277     def crop_to_frame(cls, wlpic, image_file):
 278         img = Image.open(image_file)
 279         if wlpic.frame is None or wlpic.frame == [[0, 0], [-1, -1]]:
 280             return img
 281         img = img.crop(itertools.chain(*wlpic.frame))
 282         return img
 283
 284     @staticmethod
 285     def add_source_note(wlpic, img):
 286         from PIL import ImageDraw, ImageFont
 287         from librarian import get_resource
 288
 289         annotated = Image.new(img.mode, (img.size[0], img.size[1] + 40), (255, 255, 255))
 290         annotated.paste(img, (0, 0))
 291         annotation = Image.new('RGB', (img.size[0] * 3, 120), (255, 255, 255))
 292         ImageDraw.Draw(annotation).text(
 293             (30, 15),
 294             wlpic.picture_info.source_name,
 295             (0, 0, 0),
 296             font=ImageFont.truetype(get_resource("fonts/DejaVuSerif.ttf"), 75)
 297         )
 298         annotated.paste(annotation.resize((img.size[0], 40), Image.ANTIALIAS), (0, img.size[1]))
 299         return annotated
 300
 301     # WTF/unused
 302     @classmethod
 303     def picture_list(cls, filter=None):
 304         """Generates a hierarchical listing of all pictures
 305         Pictures are optionally filtered with a test function.
 306         """
 307
 308         pics = cls.objects.all().order_by('sort_key').only('title', 'slug', 'image_file')
 309
 310         if filter:
 311             pics = pics.filter(filter).distinct()
 312
 313         pics_by_author = SortedDict()
 314         orphans = []
 315         for tag in catalogue.models.Tag.objects.filter(category='author'):
 316             pics_by_author[tag] = []
 317
 318         for pic in pics.iterator():
 319             authors = list(pic.tags.filter(category='author'))
 320             if authors:
 321                 for author in authors:
 322                     pics_by_author[author].append(pic)
 323             else:
 324                 orphans.append(pic)
 325
 326         return pics_by_author, orphans
 327
 328     @property
 329     def info(self):
 330         if not hasattr(self, '_info'):
 331             from librarian import dcparser
 332             from librarian import picture
 333             info = dcparser.parse(self.xml_file.path, picture.PictureInfo)
 334             self._info = info
 335         return self._info
 336
 337     def pretty_title(self, html_links=False):
 338         picture = self
 339         names = [(tag.name, tag.get_absolute_url())
 340                  for tag in self.tags.filter(category='author')]
 341         names.append((self.title, self.get_absolute_url()))
 342
 343         if html_links:
 344             names = ['<a href="%s">%s</a>' % (tag[1], tag[0]) for tag in names]
 345         else:
 346             names = [tag[0] for tag in names]
 347         return ', '.join(names)
 348
 349     def related_themes(self):
 350         return catalogue.models.Tag.objects.usage_for_queryset(
 351             self.areas.all(), counts=True).filter(category__in=('theme', 'thing'))
 352
 353     def flush_includes(self, languages=True):
 354         if not languages:
 355             return
 356         if languages is True:
 357             languages = [lc for (lc, _ln) in settings.LANGUAGES]
 358         flush_ssi_includes([
 359             template % (self.pk, lang)
 360             for template in [
 361                 '/katalog/p/%d/short.%s.html',
 362                 '/katalog/p/%d/mini.%s.html',
 363                 ]
 364             for lang in languages
 365             ])