Add box art and campaign image metadata fields; update feeds and backfill command

twitch/feeds.py

@@ -497,16 +497,27 @@ class GameFeed(Feed):
             return box_art
         return ""
 
-    def item_enclosure_length(self, item: Game) -> int:  # noqa: ARG002
-        """Returns the length of the enclosure."""
-        # TODO(TheLovinator): Track image size for proper length  # noqa: TD003
+    def item_enclosure_length(self, item: Game) -> int:
+        """Returns the length of the enclosure.
 
-        return 0
+        Prefer the newly-added ``box_art_size_bytes`` field so that the RSS
+        feed can include an accurate ``length`` attribute.  Fall back to 0 if
+        the value is missing or ``None``.
+        """
+        try:
+            size = getattr(item, "box_art_size_bytes", None)
+            return int(size) if size is not None else 0
+        except TypeError, ValueError:
+            return 0
 
-    def item_enclosure_mime_type(self, item: Game) -> str:  # noqa: ARG002
-        """Returns the MIME type of the enclosure."""
-        # TODO(TheLovinator): Determine actual MIME type if needed  # noqa: TD003
-        return "image/jpeg"
+    def item_enclosure_mime_type(self, item: Game) -> str:
+        """Returns the MIME type of the enclosure.
+
+        Use the ``box_art_mime_type`` field when available, otherwise fall back
+        to a generic JPEG string (as was previously hard-coded).
+        """
+        mime: str = getattr(item, "box_art_mime_type", "")
+        return mime or "image/jpeg"
 
 
 # MARK: /rss/campaigns/
@@ -633,15 +644,26 @@ class DropCampaignFeed(Feed):
         """Returns the URL of the campaign image for enclosure."""
         return item.get_feed_enclosure_url()
 
-    def item_enclosure_length(self, item: DropCampaign) -> int:  # noqa: ARG002
-        """Returns the length of the enclosure."""
-        # TODO(TheLovinator): Track image size for proper length  # noqa: TD003
-        return 0
+    def item_enclosure_length(self, item: DropCampaign) -> int:
+        """Returns the length of the enclosure.
 
-    def item_enclosure_mime_type(self, item: DropCampaign) -> str:  # noqa: ARG002
-        """Returns the MIME type of the enclosure."""
-        # TODO(TheLovinator): Determine actual MIME type if needed  # noqa: TD003
-        return "image/jpeg"
+        Reads the `image_size_bytes` field added to the model.  If the field is
+        unset it returns `0` to match previous behavior.
+        """
+        try:
+            size = getattr(item, "image_size_bytes", None)
+            return int(size) if size is not None else 0
+        except TypeError, ValueError:
+            return 0
+
+    def item_enclosure_mime_type(self, item: DropCampaign) -> str:
+        """Returns the MIME type of the enclosure.
+
+        Uses `image_mime_type` on the campaign if set, falling back to the
+        previous hard-coded `image/jpeg`.
+        """
+        mime: str = getattr(item, "image_mime_type", "")
+        return mime or "image/jpeg"
 
 
 # MARK: /rss/games/<twitch_id>/campaigns/
@@ -801,16 +823,26 @@ class GameCampaignFeed(Feed):
         """Returns the URL of the campaign image for enclosure."""
         return item.get_feed_enclosure_url()
 
-    def item_enclosure_length(self, item: DropCampaign) -> int:  # noqa: ARG002
-        """Returns the length of the enclosure."""
-        # TODO(TheLovinator): Track image size for proper length  # noqa: TD003
+    def item_enclosure_length(self, item: DropCampaign) -> int:
+        """Returns the length of the enclosure.
 
-        return 0
+        Reads the ``image_size_bytes`` field added to the model when rendering a
+        game-specific campaign feed.
+        """
+        try:
+            size = getattr(item, "image_size_bytes", None)
+            return int(size) if size is not None else 0
+        except TypeError, ValueError:
+            return 0
 
-    def item_enclosure_mime_type(self, item: DropCampaign) -> str:  # noqa: ARG002
-        """Returns the MIME type of the enclosure."""
-        # TODO(TheLovinator): Determine actual MIME type if needed  # noqa: TD003
-        return "image/jpeg"
+    def item_enclosure_mime_type(self, item: DropCampaign) -> str:
+        """Returns the MIME type of the enclosure.
+
+        Prefers `image_mime_type` on the campaign object; falls back to
+        `image/jpeg` when not available.
+        """
+        mime: str = getattr(item, "image_mime_type", "")
+        return mime or "image/jpeg"
 
 
 # MARK: /rss/reward-campaigns/

twitch/management/commands/backfill_image_dimensions.py

@@ -1,4 +1,5 @@
-"""Management command to backfill image dimensions for existing cached images."""
+import contextlib
+import mimetypes
 
 from django.core.management.base import BaseCommand
 
@@ -24,6 +25,14 @@ class Command(BaseCommand):
                 try:
                     # Opening the file and saving triggers dimension calculation
                     game.box_art_file.open()
+
+                    # populate size and mime if available
+                    with contextlib.suppress(Exception):
+                        game.box_art_size_bytes = game.box_art_file.size
+                    mime, _ = mimetypes.guess_type(game.box_art_file.name or "")
+                    if mime:
+                        game.box_art_mime_type = mime
+
                     game.save()
                     total_updated += 1
                     self.stdout.write(self.style.SUCCESS(f"  Updated {game}"))
@@ -36,6 +45,13 @@ class Command(BaseCommand):
             if campaign.image_file and not campaign.image_width:
                 try:
                     campaign.image_file.open()
+
+                    with contextlib.suppress(Exception):
+                        campaign.image_size_bytes = campaign.image_file.size
+                    mime, _ = mimetypes.guess_type(campaign.image_file.name or "")
+                    if mime:
+                        campaign.image_mime_type = mime
+
                     campaign.save()
                     total_updated += 1
                     self.stdout.write(self.style.SUCCESS(f"  Updated {campaign}"))

twitch/migrations/0013_game_box_art_mime_type_game_box_art_size_bytes.py

@@ -0,0 +1,36 @@
+# Generated by Django 6.0.3 on 2026-03-09 18:33
+
+from django.db import migrations
+from django.db import models
+
+
+class Migration(migrations.Migration):
+    """Add box art MIME type and size fields to Game, and backfill existing data."""
+
+    dependencies = [
+        ("twitch", "0012_dropcampaign_operation_names_gin_index"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="game",
+            name="box_art_mime_type",
+            field=models.CharField(
+                blank=True,
+                default="",
+                editable=False,
+                help_text="MIME type of the cached box art image (e.g., 'image/png').",
+                max_length=50,
+            ),
+        ),
+        migrations.AddField(
+            model_name="game",
+            name="box_art_size_bytes",
+            field=models.PositiveIntegerField(
+                blank=True,
+                editable=False,
+                help_text="File size of the cached box art image in bytes.",
+                null=True,
+            ),
+        ),
+    ]

twitch/migrations/0014_dropcampaign_image_mime_type_and_more.py

@@ -0,0 +1,36 @@
+# Generated by Django 6.0.3 on 2026-03-09 18:35
+
+from django.db import migrations
+from django.db import models
+
+
+class Migration(migrations.Migration):
+    """Add image MIME type and size fields to DropCampaign, and backfill existing data."""
+
+    dependencies = [
+        ("twitch", "0013_game_box_art_mime_type_game_box_art_size_bytes"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="dropcampaign",
+            name="image_mime_type",
+            field=models.CharField(
+                blank=True,
+                default="",
+                editable=False,
+                help_text="MIME type of the cached campaign image (e.g., 'image/png').",
+                max_length=50,
+            ),
+        ),
+        migrations.AddField(
+            model_name="dropcampaign",
+            name="image_size_bytes",
+            field=models.PositiveIntegerField(
+                blank=True,
+                editable=False,
+                help_text="File size of the cached campaign image in bytes.",
+                null=True,
+            ),
+        ),
+    ]

twitch/models.py

@@ -115,6 +115,19 @@ class Game(auto_prefetch.Model):
         editable=False,
         help_text="Height of cached box art image in pixels.",
     )
+    box_art_size_bytes = models.PositiveIntegerField(
+        null=True,
+        blank=True,
+        editable=False,
+        help_text="File size of the cached box art image in bytes.",
+    )
+    box_art_mime_type = models.CharField(
+        max_length=50,
+        blank=True,
+        default="",
+        editable=False,
+        help_text="MIME type of the cached box art image (e.g., 'image/png').",
+    )
 
     owners = models.ManyToManyField(
         Organization,
@@ -357,6 +370,19 @@ class DropCampaign(auto_prefetch.Model):
         editable=False,
         help_text="Height of cached image in pixels.",
     )
+    image_size_bytes = models.PositiveIntegerField(
+        null=True,
+        blank=True,
+        editable=False,
+        help_text="File size of the cached campaign image in bytes.",
+    )
+    image_mime_type = models.CharField(
+        max_length=50,
+        blank=True,
+        default="",
+        editable=False,
+        help_text="MIME type of the cached campaign image (e.g., 'image/png').",
+    )
     start_at = models.DateTimeField(
         null=True,
         blank=True,

twitch/tests/test_feeds.py

@@ -6,10 +6,15 @@ from datetime import timedelta
 from typing import TYPE_CHECKING
 
 import pytest
+from django.core.files.base import ContentFile
+from django.core.management import call_command
 from django.urls import reverse
 from django.utils import timezone
 from hypothesis.extra.django import TestCase
 
+from twitch.feeds import DropCampaignFeed
+from twitch.feeds import GameCampaignFeed
+from twitch.feeds import GameFeed
 from twitch.models import Channel
 from twitch.models import ChatBadge
 from twitch.models import ChatBadgeSet
@@ -51,6 +56,19 @@ class RSSFeedTestCase(TestCase):
             operation_names=["DropCampaignDetails"],
         )
 
+        # populate the new enclosure metadata fields so feeds can return them
+        self.game.box_art_size_bytes = 42
+        self.game.box_art_mime_type = "image/png"
+        # provide a URL so that the RSS enclosure element is emitted
+        self.game.box_art = "https://example.com/box.png"
+        self.game.save()
+
+        self.campaign.image_size_bytes = 314
+        self.campaign.image_mime_type = "image/gif"
+        # feed will only include an enclosure if there is some image URL/field
+        self.campaign.image_url = "https://example.com/campaign.png"
+        self.campaign.save()
+
     def test_organization_feed(self) -> None:
         """Test organization feed returns 200."""
         url: str = reverse("twitch:organization_feed")
@@ -73,6 +91,16 @@ class RSSFeedTestCase(TestCase):
         )
         assert expected_rss_link in content
 
+        # enclosure metadata from our new fields should be present
+        assert 'length="42"' in content
+        assert 'type="image/png"' in content
+
+    def test_game_feed_enclosure_helpers(self) -> None:
+        """Helper methods should return values from model fields."""
+        feed = GameFeed()
+        assert feed.item_enclosure_length(self.game) == 42
+        assert feed.item_enclosure_mime_type(self.game) == "image/png"
+
     def test_campaign_feed(self) -> None:
         """Test campaign feed returns 200."""
         url: str = reverse("twitch:campaign_feed")
@@ -80,6 +108,17 @@ class RSSFeedTestCase(TestCase):
         assert response.status_code == 200
         assert response["Content-Type"] == "application/rss+xml; charset=utf-8"
 
+        content: str = response.content.decode("utf-8")
+        # verify enclosure meta
+        assert 'length="314"' in content
+        assert 'type="image/gif"' in content
+
+    def test_campaign_feed_enclosure_helpers(self) -> None:
+        """Helper methods for campaigns should respect new fields."""
+        feed = DropCampaignFeed()
+        assert feed.item_enclosure_length(self.campaign) == 314
+        assert feed.item_enclosure_mime_type(self.campaign) == "image/gif"
+
     def test_campaign_feed_includes_badge_description(self) -> None:
         """Badge benefit descriptions should be visible in the RSS drop summary."""
         drop: TimeBasedDrop = TimeBasedDrop.objects.create(
@@ -152,6 +191,60 @@ class RSSFeedTestCase(TestCase):
         # Should NOT contain other campaign
         assert "Other Campaign" not in content
 
+        # enclosure metadata also should appear here
+        assert 'length="314"' in content
+        assert 'type="image/gif"' in content
+
+    def test_game_campaign_feed_enclosure_helpers(self) -> None:
+        """GameCampaignFeed helper methods should pull from the model fields."""
+        feed = GameCampaignFeed()
+        assert feed.item_enclosure_length(self.campaign) == 314
+        assert feed.item_enclosure_mime_type(self.campaign) == "image/gif"
+
+    def test_backfill_command_sets_metadata(self) -> None:
+        """Running the backfill command should populate size and mime fields.
+
+        We create a fake file for both a game and a campaign and then execute the
+        management command.  Afterward, the corresponding metadata fields should
+        be filled in.
+        """
+        # create game with local file
+        game2: Game = Game.objects.create(
+            twitch_id="file-game",
+            slug="file-game",
+            name="File Game",
+            display_name="File Game",
+        )
+        game2.box_art_file.save("sample.png", ContentFile(b"hello"))
+        game2.save()
+
+        campaign2: DropCampaign = DropCampaign.objects.create(
+            twitch_id="file-camp",
+            name="File Campaign",
+            game=self.game,
+            start_at=timezone.now(),
+            end_at=timezone.now() + timedelta(days=1),
+            operation_names=["DropCampaignDetails"],
+        )
+        campaign2.image_file.save("camp.jpg", ContentFile(b"world"))
+        campaign2.save()
+
+        # ensure fields are not populated initially
+        assert campaign2.image_size_bytes is None
+        assert not campaign2.image_mime_type
+        assert game2.box_art_size_bytes is None
+        assert not game2.box_art_mime_type
+
+        call_command("backfill_image_dimensions")
+
+        campaign2.refresh_from_db()
+        game2.refresh_from_db()
+
+        assert campaign2.image_size_bytes == len(b"world")
+        assert campaign2.image_mime_type == "image/jpeg"
+        assert game2.box_art_size_bytes == len(b"hello")
+        assert game2.box_art_mime_type == "image/png"
+
 
 QueryAsserter = Callable[..., AbstractContextManager[object]]