Add file type information to the Django models

load_sample_data.sh

@@ -57,7 +57,7 @@ docker-compose exec -T "$UPSTREAM_DB_SERVICE_NAME" /bin/bash -c "psql -U deploy
 docker-compose exec -T "$UPSTREAM_DB_SERVICE_NAME" /bin/bash -c "PGPASSWORD=deploy pg_dump -s -t audio -U deploy -d openledger -h db | head -n -14 | psql -U deploy -d openledger"
 docker-compose exec -T "$UPSTREAM_DB_SERVICE_NAME" /bin/bash -c "psql -U deploy -d openledger <<-EOF
 	ALTER TABLE audio RENAME TO audio_view;
-	ALTER TABLE audio_view ADD COLUMN standardized_popularity double precision, ADD COLUMN ingestion_type varchar(1000), ADD column filetype varchar(80), ADD COLUMN audio_set jsonb;
+	ALTER TABLE audio_view ADD COLUMN standardized_popularity double precision, ADD COLUMN ingestion_type varchar(1000), ADD COLUMN audio_set jsonb;
 	\copy audio_view (identifier,created_on,updated_on,ingestion_type,provider,source,foreign_identifier,foreign_landing_url,url,thumbnail,filetype,duration,bit_rate,sample_rate,category,genres,audio_set,audio_set_position,alt_files,filesize,license,license_version,creator,creator_url,title,meta_data,tags,watermarked,last_synced_with_source,removed_from_source,standardized_popularity) from './sample_data/sample_audio_data.csv' with (FORMAT csv, HEADER true)
 	EOF"
 

openverse_api/catalog/api/migrations/0038_filetypes.py

@@ -0,0 +1,43 @@
+# Generated by Django 3.2.7 on 2021-10-05 14:29
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('api', '0037_media_thumbnails'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='audio',
+            name='filetype',
+            field=models.CharField(blank=True, help_text='The type of the file, related to the file extension.', max_length=80, null=True),
+        ),
+        migrations.AddField(
+            model_name='audioset',
+            name='filetype',
+            field=models.CharField(blank=True, help_text='The type of the file, related to the file extension.', max_length=80, null=True),
+        ),
+        migrations.AddField(
+            model_name='image',
+            name='filetype',
+            field=models.CharField(blank=True, help_text='The type of the file, related to the file extension.', max_length=80, null=True),
+        ),
+        migrations.AlterField(
+            model_name='audio',
+            name='filesize',
+            field=models.IntegerField(blank=True, help_text='Number in bytes, e.g. 1024.', null=True),
+        ),
+        migrations.AlterField(
+            model_name='audioset',
+            name='filesize',
+            field=models.IntegerField(blank=True, help_text='Number in bytes, e.g. 1024.', null=True),
+        ),
+        migrations.AlterField(
+            model_name='image',
+            name='filesize',
+            field=models.IntegerField(blank=True, help_text='Number in bytes, e.g. 1024.', null=True),
+        ),
+    ]

openverse_api/catalog/api/models/audio.py

@@ -49,7 +49,36 @@ class AudioSet(IdentifierMixin, MediaMixin, FileMixin, OpenLedgerModel):
     pass
 
 
-class Audio(AbstractMedia):
+class AudioFileMixin(FileMixin):
+    """
+    This mixin adds fields related to audio quality to the standard file mixin.
+    Do not use this as the sole base class.
+    """
+
+    bit_rate = models.IntegerField(
+        blank=True,
+        null=True,
+        help_text="Number in bits per second, eg. 128000.",
+    )
+    sample_rate = models.IntegerField(
+        blank=True,
+        null=True,
+        help_text="Number in hertz, eg. 44100.",
+    )
+
+    @property
+    def sample_rate_in_khz(self):
+        return self.sample_rate / 1e3
+
+    @property
+    def bit_rate_in_kbps(self):
+        return self.bit_rate / 1e3
+
+    class Meta:
+        abstract = True
+
+
+class Audio(AudioFileMixin, AbstractMedia):
     audio_set = models.ForeignKey(
         help_text="Reference to set of which this track is a part.",
         to=AudioSet,
@@ -85,16 +114,6 @@ class Audio(AbstractMedia):
         null=True,
         help_text="The time length of the audio file in milliseconds.",
     )
-    bit_rate = models.IntegerField(
-        blank=True,
-        null=True,
-        help_text="Number in bits per second, eg. 128000.",
-    )
-    sample_rate = models.IntegerField(
-        blank=True,
-        null=True,
-        help_text="Number in hertz, eg. 44100.",
-    )
 
     alt_files = models.JSONField(
         blank=True,
@@ -112,14 +131,6 @@ def alternative_files(self):
     def duration_in_s(self):
         return self.duration / 1e3
 
-    @property
-    def sample_rate_in_khz(self):
-        return self.sample_rate / 1e3
-
-    @property
-    def bit_rate_in_kbps(self):
-        return self.bit_rate / 1e3
-
     class Meta(AbstractMedia.Meta):
         db_table = "audio"
 

openverse_api/catalog/api/models/image.py

@@ -6,14 +6,31 @@
     AbstractMediaList,
     AbstractMediaReport,
 )
+from catalog.api.models.mixins import FileMixin
 from django.db import models
 from uuslug import uuslug
 
 
-class Image(AbstractMedia):
+class ImageFileMixin(FileMixin):
+    """
+    This mixin adds fields related to image resolution to the standard file
+    mixin. Do not use this as the sole base class.
+    """
+
     width = models.IntegerField(blank=True, null=True)
     height = models.IntegerField(blank=True, null=True)
 
+    @property
+    def resolution_in_mp(self):  # ~ MP or megapixels
+        return (self.width * self.height) / 1e6
+
+    class Meta:
+        abstract = True
+
+
+class Image(ImageFileMixin, AbstractMedia):
+    pass
+
     class Meta(AbstractMedia.Meta):
         db_table = "image"
 

openverse_api/catalog/api/models/media.py

@@ -1,7 +1,9 @@
+import mimetypes
+
 import catalog.api.controllers.search_controller as search_controller
 from catalog.api.licenses import ATTRIBUTION, get_license_url
 from catalog.api.models.base import OpenLedgerModel
-from catalog.api.models.mixins import FileMixin, IdentifierMixin, MediaMixin
+from catalog.api.models.mixins import IdentifierMixin, MediaMixin
 from django.contrib.postgres.fields import ArrayField
 from django.db import models
 from django.utils.html import format_html
@@ -17,7 +19,7 @@
 OTHER = "other"
 
 
-class AbstractMedia(IdentifierMixin, MediaMixin, FileMixin, OpenLedgerModel):
+class AbstractMedia(IdentifierMixin, MediaMixin, OpenLedgerModel):
     """
     Generic model from which to inherit all media classes. This class stores
     information common to all media types indexed by Openverse.
@@ -259,9 +261,28 @@ class AbstractAltFile:
     provides alternative qualities, formats and resolutions that are available
     from the provider that are not canonical.
 
-    The schema of the class must correspond to that of the ``FileMixin`` class.
+    The schema of the class must correspond to that of the
+    :py:class:`catalog.api.models.mixins.FileMixin` class.
     """
 
     def __init__(self, attrs):
         self.url = attrs.get("url")
         self.filesize = attrs.get("filesize")
+        self.filetype = attrs.get("filetype")
+
+    @property
+    def size_in_mib(self):  # ~ MiB or mibibytes
+        return self.filesize / 2 ** 20
+
+    @property
+    def size_in_mb(self):  # ~ MB or megabytes
+        return self.filesize / 1e6
+
+    @property
+    def mime_type(self):
+        """
+        Get the MIME type of the file inferred from the extension of the file.
+        :return: the inferred MIME type of the file
+        """
+
+        return mimetypes.types_map[f".{self.filetype}"]

openverse_api/catalog/api/models/mixins.py

@@ -1,3 +1,5 @@
+import mimetypes
+
 from django.db import models
 
 
@@ -64,7 +66,35 @@ class FileMixin(models.Model):
     url = models.URLField(
         unique=True, max_length=1000, help_text="The actual URL to the media file."
     )
-    filesize = models.IntegerField(blank=True, null=True)
+    filesize = models.IntegerField(
+        blank=True,
+        null=True,
+        help_text="Number in bytes, e.g. 1024.",
+        # Bytes for parity with the HTTP Content-Length header
+    )
+    filetype = models.CharField(
+        max_length=80,
+        blank=True,
+        null=True,
+        help_text="The type of the file, related to the file extension.",
+    )
+
+    @property
+    def size_in_mib(self):  # ~ MiB or mibibytes
+        return self.filesize / 2 ** 20
+
+    @property
+    def size_in_mbs(self):  # ~ MB or megabytes
+        return self.filesize / 1e6
+
+    @property
+    def mime_type(self):
+        """
+        Get the MIME type of the file inferred from the extension of the file.
+        :return: the inferred MIME type of the file
+        """
+
+        return mimetypes.types_map[f".{self.filetype}"]
 
     class Meta:
         abstract = True