For getting whiteboard info

dotnet/AipsCore/Application/Models/Whiteboard/Query/GetWhiteboard/GetWhiteboardQuery.cs

@@ -0,0 +1,5 @@
+using AipsCore.Application.Abstract.Query;
+
+namespace AipsCore.Application.Models.Whiteboard.Query.GetWhiteboard;
+
+public record GetWhiteboardQuery(string WhiteboardId) : IQuery<Infrastructure.Persistence.Whiteboard.Whiteboard?>;

dotnet/AipsCore/Application/Models/Whiteboard/Query/GetWhiteboard/GetWhiteboardQueryHandler.cs

@@ -0,0 +1,23 @@
+using AipsCore.Application.Abstract.Query;
+using AipsCore.Infrastructure.Persistence.Db;
+using Microsoft.EntityFrameworkCore;
+
+namespace AipsCore.Application.Models.Whiteboard.Query.GetWhiteboard;
+
+public class GetWhiteboardQueryHandler 
+    : IQueryHandler<GetWhiteboardQuery, Infrastructure.Persistence.Whiteboard.Whiteboard?>
+{
+    private readonly AipsDbContext _context;
+    
+    public GetWhiteboardQueryHandler(AipsDbContext context)
+    {
+        _context = context;
+    }
+    
+    public async Task<Infrastructure.Persistence.Whiteboard.Whiteboard?> Handle(GetWhiteboardQuery query, CancellationToken cancellationToken = default)
+    {
+        return await _context.Whiteboards
+            .Where(w => w.Id.ToString() == query.WhiteboardId)
+            .FirstOrDefaultAsync(cancellationToken);
+    }
+}

dotnet/AipsWebApi/Controllers/WhiteboardController.cs

@@ -1,6 +1,7 @@
 using AipsCore.Application.Abstract;
 using AipsCore.Application.Models.Whiteboard.Command.CreateWhiteboard;
 using AipsCore.Application.Models.Whiteboard.Query.GetRecentWhiteboards;
+using AipsCore.Application.Models.Whiteboard.Query.GetWhiteboard;
 using AipsCore.Application.Models.Whiteboard.Query.GetWhiteboardHistory;
 using AipsCore.Application.Models.WhiteboardMembership.Command.CreateWhiteboardMembership;
 using Microsoft.AspNetCore.Authorization;
@@ -22,11 +23,23 @@ public class WhiteboardController : ControllerBase
     
     [Authorize]
     [HttpPost]
-    public async Task<ActionResult<int>> CreateWhiteboard(CreateWhiteboardCommand command, CancellationToken cancellationToken)
+    public async Task<ActionResult<string>> CreateWhiteboard(CreateWhiteboardCommand command, CancellationToken cancellationToken)
     {
         var whiteboardId = await _dispatcher.Execute(command, cancellationToken);
         return Ok(whiteboardId.IdValue);
     }
+    
+    [Authorize]
+    [HttpGet("{whiteboardId}")]
+    public async Task<ActionResult<Whiteboard>> GetWhiteboardById([FromRoute] string whiteboardId, CancellationToken cancellationToken)
+    {
+        var whiteboard = await _dispatcher.Execute(new GetWhiteboardQuery(whiteboardId), cancellationToken);
+        if (whiteboard == null)
+        {
+            return NotFound();
+        }
+        return Ok(whiteboard);
+    }
 
     [Authorize]
     [HttpGet("history")]