✨ Sanitize text to remove hidden unicode and control characters

DysonNetwork.Sphere/Account/AccountCurrentController.cs

@@ -6,6 +6,7 @@ using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.EntityFrameworkCore;
 using NodaTime;
+using Org.BouncyCastle.Utilities;
 
 namespace DysonNetwork.Sphere.Account;
 
@@ -421,6 +422,43 @@ public class AccountCurrentController(
         }
     }
 
+    public class AuthorizedDevice
+    {
+        public string? Label { get; set; }
+        public string UserAgent { get; set; } = null!;
+        public string DeviceId { get; set; } = null!;
+        public List<Session> Sessions { get; set; } = new();
+    }
+
+    [HttpGet("devices")]
+    [Authorize]
+    public async Task<ActionResult<List<AuthorizedDevice>>> GetDevices()
+    {
+        if (HttpContext.Items["CurrentUser"] is not Account currentUser)
+        {
+            return Unauthorized();
+        }
+
+        // Group sessions by the related DeviceId, then create an AuthorizedDevice for each group.
+        var deviceGroups = await db.AuthSessions
+            .Where(s => s.Account.Id == currentUser.Id)
+            // Include the challenge if you need it to access DeviceId
+            .Include(s => s.Challenge)
+            .GroupBy(s => s.Challenge.DeviceId!)
+            .Select(g => new AuthorizedDevice
+            {
+                DeviceId = g.Key!,
+                UserAgent = g.First(x => x.Challenge.UserAgent != null).Challenge.UserAgent!,
+                Label = g.Where(x => string.IsNullOrWhiteSpace(x.Label)).Select(x => x.Label).FirstOrDefault(),
+                Sessions = g
+                    .OrderByDescending(x => x.LastGrantedAt)
+                    .ToList()
+            })
+            .ToListAsync();
+
+        return Ok(deviceGroups);
+    }
+
     [HttpGet("sessions")]
     [Authorize]
     public async Task<ActionResult<List<Session>>> GetSessions(
@@ -434,8 +472,7 @@ public class AccountCurrentController(
         var query = db.AuthSessions
             .Include(session => session.Account)
             .Include(session => session.Challenge)
-            .Where(session => session.Account.Id == currentUser.Id)
+            .Where(session => session.Account.Id == currentUser.Id);
-            .OrderByDescending(session => session.CreatedAt);
 
         var total = await query.CountAsync();
         Response.Headers.Append("X-Total", total.ToString());

DysonNetwork.Sphere/Chat/ChatController.cs

@@ -1,4 +1,6 @@
 using System.ComponentModel.DataAnnotations;
+using System.Globalization;
+using System.Text;
 using System.Text.RegularExpressions;
 using DysonNetwork.Sphere.Permission;
 using DysonNetwork.Sphere.Storage;
@@ -142,6 +144,8 @@ public partial class ChatController(AppDatabase db, ChatService cs, ChatRoomServ
     public async Task<ActionResult> SendMessage([FromBody] SendMessageRequest request, Guid roomId)
     {
         if (HttpContext.Items["CurrentUser"] is not Account.Account currentUser) return Unauthorized();
+
+        request.Content = TextSanitizer.Sanitize(request.Content);
         if (string.IsNullOrWhiteSpace(request.Content) &&
             (request.AttachmentsId == null || request.AttachmentsId.Count == 0))
             return BadRequest("You cannot send an empty message.");
@@ -218,6 +222,8 @@ public partial class ChatController(AppDatabase db, ChatService cs, ChatRoomServ
     {
         if (HttpContext.Items["CurrentUser"] is not Account.Account currentUser) return Unauthorized();
 
+        request.Content = TextSanitizer.Sanitize(request.Content);
+
         var message = await db.ChatMessages
             .Include(m => m.Sender)
             .Include(m => m.Sender.Account)
@@ -230,6 +236,10 @@ public partial class ChatController(AppDatabase db, ChatService cs, ChatRoomServ
         if (message.Sender.AccountId != currentUser.Id)
             return StatusCode(403, "You can only edit your own messages.");
 
+        if (string.IsNullOrWhiteSpace(request.Content) &&
+            (request.AttachmentsId == null || request.AttachmentsId.Count == 0))
+            return BadRequest("You cannot send an empty message.");
+
         if (request.RepliedMessageId.HasValue)
         {
             var repliedMessage = await db.ChatMessages

DysonNetwork.Sphere/Post/PostController.cs

@@ -3,6 +3,7 @@ using System.Text.Json;
 using DysonNetwork.Sphere.Account;
 using DysonNetwork.Sphere.Permission;
 using DysonNetwork.Sphere.Publisher;
+using DysonNetwork.Sphere.Storage;
 using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.EntityFrameworkCore;
@@ -149,6 +150,7 @@ public class PostController(
         [FromHeader(Name = "X-Pub")] string? publisherName
     )
     {
+        request.Content = TextSanitizer.Sanitize(request.Content);
         if (string.IsNullOrWhiteSpace(request.Content) && request.Attachments is { Count: 0 })
             return BadRequest("Content is required.");
         if (HttpContext.Items["CurrentUser"] is not Account.Account currentUser) return Unauthorized();
@@ -290,6 +292,7 @@ public class PostController(
     [HttpPatch("{id:guid}")]
     public async Task<ActionResult<Post>> UpdatePost(Guid id, [FromBody] PostRequest request)
     {
+        request.Content = TextSanitizer.Sanitize(request.Content);
         if (string.IsNullOrWhiteSpace(request.Content) && request.Attachments is { Count: 0 })
             return BadRequest("Content is required.");
         if (HttpContext.Items["CurrentUser"] is not Account.Account currentUser) return Unauthorized();

DysonNetwork.Sphere/Storage/TextSanitizer.cs

@@ -0,0 +1,24 @@
+using System.Globalization;
+using System.Text;
+
+namespace DysonNetwork.Sphere.Storage;
+
+public abstract class TextSanitizer
+{
+    public static string? Sanitize(string? text)
+    {
+        if (string.IsNullOrEmpty(text)) return text;
+
+        var filtered = new StringBuilder();
+        foreach (var ch in from ch in text
+                 let category = CharUnicodeInfo.GetUnicodeCategory(ch)
+                 where category is not (UnicodeCategory.Control or UnicodeCategory.Format
+                     or UnicodeCategory.NonSpacingMark)
+                 select ch)
+        {
+            filtered.Append(ch);
+        }
+        
+        return filtered.ToString(); 
+    }
+}