feat(files): add per-channel storage quota [CI]

server/tests/WebDrop.Core.Tests/ChannelServiceTests.cs

@@ -163,6 +163,28 @@ public class ChannelServiceTests : IDisposable
         Assert.Equal("Team space", Svc.GetChannel(channel.Id, channel.Owner(_ownerEp)).Settings.Name);
     }
 
+    [Fact]
+    public async Task FileGroupQuotaIsPerWorkspaceChannelAndFreedOnDelete()
+    {
+        _env.Limits.MaxWorkspaceChannelBytes = 200;
+        var space = _env.Create(_ownerEp, ChannelMode.Raw);
+        var owner = space.Owner(_ownerEp);
+        var channelId = Svc.GetWorkspace(space.Id, owner).DefaultChannelId!;
+        var first = TestEnv.NewId(); var second = TestEnv.NewId();
+        Svc.DeclareObject(space.Id, owner, new ObjectEnvelope { ItemId = first.ToBase64Url(), ChannelId = channelId, Domain = CryptoDomain.Files, Epoch = 0, KeyEnvelope = "" });
+        Svc.DeclareObject(space.Id, owner, new ObjectEnvelope { ItemId = second.ToBase64Url(), ChannelId = channelId, Domain = CryptoDomain.Files, Epoch = 0, KeyEnvelope = "" });
+
+        byte[] firstFrame = TestEnv.Frame(first, 0, FrameFlags.Final, 120);
+        await Svc.AppendFrameAsync(space.Id, owner, firstFrame, null);
+        Assert.Equal(firstFrame.Length, Svc.GetWorkspace(space.Id, owner).Channels.Single().FileBytes);
+        await AssertCode(ErrorCode.TooLarge, () => Svc.AppendFrameAsync(space.Id, owner, TestEnv.Frame(second, 0, FrameFlags.Final, 60), null));
+
+        Svc.DeleteItem(space.Id, owner, first);
+        Assert.Equal(0, Svc.GetWorkspace(space.Id, owner).Channels.Single().FileBytes);
+        await Svc.AppendFrameAsync(space.Id, owner, TestEnv.Frame(second, 0, FrameFlags.Final, 60), null);
+        Assert.Equal(86, Svc.GetWorkspace(space.Id, owner).Channels.Single().FileBytes);
+    }
+
     [Fact]
     public async Task ItemIdsAndFramesAreScopedToTheirChannel()
     {