Code layout change.

[wolnelektury.git] / src / catalogue / models / bookmedia.py

diff --git a/src/catalogue/models/bookmedia.py b/src/catalogue/models/bookmedia.py
new file mode 100644 (file)
index 0000000..1ef3fd7
--- /dev/null
+++ b/src/catalogue/models/bookmedia.py
@@ -0,0 +1,134 @@
+# -*- coding: utf-8 -*-
+# This file is part of Wolnelektury, licensed under GNU Affero GPLv3 or later.
+# Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information.
+#
+from collections import OrderedDict
+import json
+from collections import namedtuple
+from django.db import models
+from django.utils.translation import ugettext_lazy as _
+import jsonfield
+from fnpdjango.utils.text.slughifi import slughifi
+from catalogue.fields import OverwritingFileField
+
+
+def _file_upload_to(i, _n):
+    return 'book/%(ext)s/%(name)s.%(ext)s' % {
+            'ext': i.ext(), 'name': slughifi(i.name)}
+
+class BookMedia(models.Model):
+    """Represents media attached to a book."""
+    FileFormat = namedtuple("FileFormat", "name ext")
+    formats = OrderedDict([
+        ('mp3', FileFormat(name='MP3', ext='mp3')),
+        ('ogg', FileFormat(name='Ogg Vorbis', ext='ogg')),
+        ('daisy', FileFormat(name='DAISY', ext='daisy.zip')),
+    ])
+    format_choices = [(k, _('%s file' % t.name))
+            for k, t in formats.items()]
+
+    type = models.CharField(_('type'), db_index=True, choices=format_choices, max_length=20)
+    name = models.CharField(_('name'), max_length=512)
+    file = OverwritingFileField(_('file'), max_length=600,
+        upload_to=_file_upload_to)
+    uploaded_at = models.DateTimeField(_('creation date'), auto_now_add=True, editable=False, db_index=True)
+    extra_info = jsonfield.JSONField(_('extra information'), default={}, editable=False)
+    book = models.ForeignKey('Book', related_name='media')
+    source_sha1 = models.CharField(null=True, blank=True, max_length=40, editable=False)
+
+    def __unicode__(self):
+        return "%s (%s)" % (self.name, self.file.name.split("/")[-1])
+
+    class Meta:
+        ordering            = ('type', 'name')
+        verbose_name        = _('book media')
+        verbose_name_plural = _('book media')
+        app_label = 'catalogue'
+
+    def save(self, *args, **kwargs):
+        from catalogue.utils import ExistingFile, remove_zip
+
+        try:
+            old = BookMedia.objects.get(pk=self.pk)
+        except BookMedia.DoesNotExist:
+            old = None
+        else:
+            # if name changed, change the file name, too
+            if slughifi(self.name) != slughifi(old.name):
+                self.file.save(None, ExistingFile(self.file.path), save=False, leave=True)
+
+        super(BookMedia, self).save(*args, **kwargs)
+
+        # remove the zip package for book with modified media
+        if old:
+            remove_zip("%s_%s" % (old.book.slug, old.type))
+        remove_zip("%s_%s" % (self.book.slug, self.type))
+
+        extra_info = self.extra_info
+        if isinstance(extra_info, basestring):
+            # Walkaround for weird jsonfield 'no-decode' optimization.
+            extra_info = json.loads(extra_info)
+        extra_info.update(self.read_meta())
+        self.extra_info = extra_info
+        self.source_sha1 = self.read_source_sha1(self.file.path, self.type)
+        return super(BookMedia, self).save(*args, **kwargs)
+
+    def read_meta(self):
+        """
+            Reads some metadata from the audiobook.
+        """
+        import mutagen
+        from mutagen import id3
+
+        artist_name = director_name = project = funded_by = ''
+        if self.type == 'mp3':
+            try:
+                audio = id3.ID3(self.file.path)
+                artist_name = ', '.join(', '.join(tag.text) for tag in audio.getall('TPE1'))
+                director_name = ', '.join(', '.join(tag.text) for tag in audio.getall('TPE3'))
+                project = ", ".join([t.data for t in audio.getall('PRIV')
+                        if t.owner == 'wolnelektury.pl?project'])
+                funded_by = ", ".join([t.data for t in audio.getall('PRIV')
+                        if t.owner == 'wolnelektury.pl?funded_by'])
+            except:
+                pass
+        elif self.type == 'ogg':
+            try:
+                audio = mutagen.File(self.file.path)
+                artist_name = ', '.join(audio.get('artist', []))
+                director_name = ', '.join(audio.get('conductor', []))
+                project = ", ".join(audio.get('project', []))
+                funded_by = ", ".join(audio.get('funded_by', []))
+            except:
+                pass
+        else:
+            return {}
+        return {'artist_name': artist_name, 'director_name': director_name,
+                'project': project, 'funded_by': funded_by}
+
+    def ext(self):
+        return self.formats[self.type].ext
+
+    @staticmethod
+    def read_source_sha1(filepath, filetype):
+        """
+            Reads source file SHA1 from audiobok metadata.
+        """
+        import mutagen
+        from mutagen import id3
+
+        if filetype == 'mp3':
+            try:
+                audio = id3.ID3(filepath)
+                return [t.data for t in audio.getall('PRIV')
+                        if t.owner == 'wolnelektury.pl?flac_sha1'][0]
+            except:
+                return None
+        elif filetype == 'ogg':
+            try:
+                audio = mutagen.File(filepath)
+                return audio.get('flac_sha1', [None])[0]
+            except:
+                return None
+        else:
+            return None