Add synced user notes

api/QuestionsApi/Controllers/NotesController.cs

@@ -0,0 +1,35 @@
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Mvc;
+using QuestionsApi.Models;
+using QuestionsApi.Services;
+using System.Security.Claims;
+
+namespace QuestionsApi.Controllers;
+
+[ApiController, Route("api/notes"), Authorize(Roles = "USER,SUPER")]
+public sealed class NotesController(UserNotepadStore notes) : ControllerBase
+{
+    [HttpGet]
+    public async Task<ActionResult<UserNotepadResponse>> Get()
+    {
+        var note = await notes.GetAsync(UserId());
+        return Ok(note is null ? UserNotepadResponse.Empty() : UserNotepadResponse.FromModel(note));
+    }
+
+    [HttpPut]
+    public async Task<ActionResult<UserNotepadResponse>> Update(UpdateUserNotepadRequest request)
+    {
+        if (UserNotepadValidator.Validate(request) is { } error) return BadRequest(error);
+        var result = await notes.UpdateAsync(UserId(), request.Content ?? "", request.ExpectedRevision);
+        if (result.Succeeded) return Ok(UserNotepadResponse.FromModel(result.Note!));
+        var current = result.Current is null
+            ? UserNotepadResponse.Empty()
+            : UserNotepadResponse.FromModel(result.Current);
+        return Conflict(current);
+    }
+
+    private string UserId() => User.FindFirstValue(ClaimTypes.NameIdentifier)
+        ?? User.FindFirstValue(ClaimTypes.Name)
+        ?? User.Identity?.Name
+        ?? "";
+}