A login's storage is counted, and can have a quota

MediaAttachment.Size was stored and never summed: nobody, the administrator included, could tell what media took,
and nothing bounded it. Counted.Media and MediaOfRoot sum what is kept (not trashed). A login sees what its personas'
uploads and pictures take at /clientapi/user/storage (ViewStorage), with its quota when the server sets one;
Media:QuotaBytesPerRoot (0, no quota, by default) refuses an upload or a picture over it with 422, whichever persona
sends it; the statistics overview gains the media totals, the proxy cache and the trash (ViewMediaTotals). Tests: a
login's storage counts what its personas keep and forgets what is trashed; two uploads from two personas of one login
are refused together past the quota.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LsXgEaXee4GCU1hwYgPJXw

PrivaPub/Domain/Media/MediaOptions.cs

@@ -16,5 +16,6 @@ namespace PrivaPub.Domain.Media
 		public long MaxVideoPixels { get; set; } = 2_304_000;//a larger video is made smaller (as Mastodon's video_matrix_limit)
 		public double MaxFrameRate { get; set; } = 60;
 		public int MaxSeconds { get; set; } = 3600;//audio or video may not last longer
+		public long QuotaBytesPerRoot { get; set; }//what a login's media may take (0: no quota)
 	}
 }

PrivaPub/Domain/Media/MediaService.cs

@@ -120,6 +120,8 @@ namespace PrivaPub.Domain.Media
 				return MediaOutcome.Fail(StatusCodes.Status422UnprocessableEntity, "Validation failed: File can't be blank");
 			var options = _options.CurrentValue;
 			var contentType = file.ContentType?.Split(';')[0].Trim().ToLowerInvariant();
+			if (await OverQuota(owner.Id, file.Length, token) is { } full)
+				return full;
 
 			var attachment = new MediaAttachment
 			{
@@ -203,6 +205,8 @@ namespace PrivaPub.Domain.Media
 				return MediaOutcome.Fail(StatusCodes.Status422UnprocessableEntity, "Validation failed: File type is not supported");
 			if (file.Length > _options.CurrentValue.MaxImageBytes)
 				return MediaOutcome.Fail(StatusCodes.Status422UnprocessableEntity, "Validation failed: File is too big");
+			if (await OverQuota(avatarId, file.Length, token) is { } full)
+				return full;
 			var input = await Read(file, token);
 			if (Refusal(input, _options.CurrentValue) is { } refused)
 				return refused;
@@ -241,6 +245,19 @@ namespace PrivaPub.Domain.Media
 			return new MediaOutcome(attachment);
 		}
 
+		// a login over its quota (Media:QuotaBytesPerRoot; none when 0) uploads nothing more
+		async Task<MediaOutcome> OverQuota(string avatarId, long incoming, CancellationToken token)
+		{
+			var quota = _options.CurrentValue.QuotaBytesPerRoot;
+			if (quota <= 0)
+				return default;
+			var rootId = (await DB.Default.Find<Models.User.RootToAvatar>().Match(r => r.AvatarId == avatarId).ExecuteFirstAsync(token))?.RootId;
+			if (rootId == default)
+				return default;
+			var (bytes, _) = await Privacy.Counted.MediaOfRoot(rootId, token);
+			return bytes + incoming > quota ? MediaOutcome.Fail(StatusCodes.Status422UnprocessableEntity, "Validation failed: Your storage is full") : default;
+		}
+
 		public async Task<long> Trash(System.Linq.Expressions.Expression<Func<MediaAttachment, bool>> which, string reason, CancellationToken token)
 		{
 			var trashed = 0L;

PrivaPub/Domain/Privacy/Counted.cs

@@ -1,3 +1,4 @@
+using MongoDB.Driver;
 using MongoDB.Entities;
 
 using PrivaPub.Federation.Actors;
@@ -64,6 +65,24 @@ namespace PrivaPub.Domain.Privacy
 			return distinct.Count == 0 ? 0 : await DB.Default.CountAsync<Avatar>(a => distinct.Contains(a.ID) && !a.DeletionAt.HasValue, token);
 		}
 
+		// the media kept (not trashed) that which holds: their bytes and how many
+		public static async Task<(long Bytes, long Files)> Media(Expression<Func<Models.Media.MediaAttachment, bool>> which, CancellationToken token)
+		{
+			var totals = await DB.Default.Fluent<Models.Media.MediaAttachment>()
+				.Match(m => m.TrashedAt == null)
+				.Match(which)
+				.Group(m => true, g => new { Bytes = g.Sum(m => m.Size), Files = g.LongCount() })
+				.FirstOrDefaultAsync(token);
+			return totals == default ? (0, 0) : (totals.Bytes, totals.Files);
+		}
+
+		// a login's media: every persona's uploads and pictures
+		public static async Task<(long Bytes, long Files)> MediaOfRoot(string rootId, CancellationToken token)
+		{
+			var personas = (await DB.Default.Find<Models.User.RootToAvatar>().Match(r => r.RootId == rootId).ExecuteAsync(token)).Select(r => r.AvatarId).ToList();
+			return await Media(m => personas.Contains(m.OwnerAvatarId), token);
+		}
+
 		public static async Task<long> LocalPosts(CancellationToken token)
 		{
 			var barred = await BarredPersonas(token);

PrivaPub/Domain/Statistics/StatisticsQueries.cs

@@ -74,10 +74,18 @@ namespace PrivaPub.Domain.Statistics
 					Written = server.Sum(d => d.LedgerWritten),
 					Dropped = server.Sum(d => d.LedgerDropped),
 					Failed = server.Sum(d => d.LedgerFailed)
-				}
+				},
+				Media = await MediaTotals(token)
 			};
 		}
 
+		// the media rows kept; the disk's caches are added by whoever knows where they are
+		static async Task<ViewMediaTotals> MediaTotals(CancellationToken token)
+		{
+			var (bytes, files) = await Domain.Privacy.Counted.Media(m => true, token);
+			return new ViewMediaTotals { MediaBytes = bytes, MediaFiles = files };
+		}
+
 		public async Task<ViewHostsPage> Hosts(int days, string sort, string software, int page, int limit, CancellationToken token)
 		{
 			var hostDays = await Days(days, default, token);