Merge branch 'master' of ssh://git.mdrn.pl:2223/audio

diff --combined src/archive/models.py
index 11917b8,b15bec2..03cd816
--- 1/src/archive/models.py
--- 2/src/archive/models.py
+++ b/src/archive/models.py
@@@ -1,3 -1,4 +1,4 @@@
+ import io
  import json
  import os.path
  
@@@ -27,6 -28,7 +28,7 @@@ class Project(models.Model)
      name = models.CharField(max_length=128, unique=True, db_index=True, verbose_name="Nazwa")
      sponsors = models.TextField(blank=True, null=True, verbose_name="Sponsorzy")
      description = models.TextField(blank=True, verbose_name="Opis")
+     youtube = models.ForeignKey('youtube.YouTube', models.PROTECT)
  
      class Meta:
          verbose_name = _("project")
@@@ -63,7 -65,6 +65,7 @@@ class Audiobook(models.Model)
      source_file = models.FileField(upload_to=source_upload_to, max_length=255, 
              verbose_name=_('source file'), editable=False)
      source_sha1 = models.CharField(max_length=40, editable=False)
 +    duration = models.FloatField(null=True, editable=False)
  
      title = models.CharField(max_length=255, verbose_name=_('title'))
      part_name = models.CharField(max_length=255, verbose_name=_('part name'), help_text=_('eg. chapter in a novel'),
@@@ -82,7 -83,7 +84,7 @@@
      encoded_by = models.CharField(max_length=255, verbose_name=_('encoded by'))
      date = models.CharField(max_length=255, verbose_name=_('date'))
      project = models.ForeignKey(Project, models.PROTECT, verbose_name=_('project'))
-     slug = models.SlugField(max_length=120, help_text=_('WL catalogue slug of the book.'))
+     slug = models.SlugField(max_length=120, blank=True, help_text=_('WL catalogue slug of the book.'))
      translator = models.CharField(max_length=255, null=True, blank=True, verbose_name=_('translator'))
      modified = models.DateTimeField(null=True, editable=False)
      license = models.ForeignKey(License, models.PROTECT, null=True, blank=True, verbose_name=_('license'))
@@@ -223,5 -224,26 +225,26 @@@
  
      @cached_property
      def book(self):
-         apidata = requests.get(f'https://wolnelektury.pl/api/books/{self.slug}/').json()
+         if self.slug:
+             apidata = requests.get(f'https://wolnelektury.pl/api/books/{self.slug}/').json()
+         else:
+             return {}
          return apidata
+ 
+     @property
+     def document(self):
+         from librarian.document import WLDocument, parser
+         from lxml import etree
+ 
+         xml_url = self.book.get('xml', None)
+         if xml_url is None:
+             return None
+ 
+         return WLDocument(
+                 etree.parse(
+                     io.BytesIO(
+                         requests.get(xml_url).content
+                     )
+                     ,parser = parser
+                 )
+             )