added refresh endpoint and dto

ApiEfCoreLibrary/DTO/Refresh/Request/RefreshTokenDto.cs

@@ -0,0 +1,6 @@
+namespace ApiEfCoreLibrary.DTO.Refresh.Request;
+
+public class RefreshTokenDto
+{
+    public string? Token { get; set; }
+}

ApiEfCoreLibrary/DTO/Refresh/Response/GetRefreshDto.cs

@@ -0,0 +1,6 @@
+namespace ApiEfCoreLibrary.DTO.Refresh.Response;
+
+public class GetRefreshDto
+{
+    public string? Token { get; set; }
+}

ApiEfCoreLibrary/Endpoints/Refresh/RefreshTokenEndpoint.cs

@@ -0,0 +1,63 @@
+using System.IdentityModel.Tokens.Jwt;
+using ApiEfCoreLibrary.DTO.Login.Response;
+using ApiEfCoreLibrary.DTO.Refresh.Request;
+using ApiEfCoreLibrary.DTO.Refresh.Response;
+using FastEndpoints;
+using FastEndpoints.Security;
+using Microsoft.EntityFrameworkCore;
+
+namespace ApiEfCoreLibrary.Endpoints.Refresh;
+
+public class RefreshTokenEndpoint(LibraryDbContext database) : Endpoint<RefreshTokenDto, GetRefreshDto>
+{
+    public override void Configure()
+    {
+        Post("/refresh");
+        AllowAnonymous();
+    }
+    
+    public override async Task HandleAsync(RefreshTokenDto req, CancellationToken ct)
+    {
+        try
+        { 
+            JwtSecurityTokenHandler handler = new JwtSecurityTokenHandler();
+            var token = handler.ReadJwtToken(req.Token);
+            string? username = token.Claims.FirstOrDefault(c => c.Type == "Username")?.Value;
+
+            if (string.IsNullOrWhiteSpace(username))
+            {
+                await Send.UnauthorizedAsync(ct);
+                return;
+            }
+
+            var login = await database.Logins.FirstOrDefaultAsync(x => x.Username == username, ct);
+            if (login == null)
+            {
+                await Send.UnauthorizedAsync(ct);
+                return;
+            }
+
+            string jwtToken = JwtBearer.CreateToken(
+                o =>
+                {
+                    o.SigningKey = "ThisIsASuperSecretJwtKeyThatIsAtLeast32CharsLong";
+                    o.ExpireAt = DateTime.UtcNow.AddMinutes(15);
+                    if (login.Role != null) o.User.Roles.Add(login.Role);
+                    o.User.Claims.Add(("Username", login.Username)!);
+                    o.User.Claims.Add(("FullName", login.FullName)!);
+                    o.User["UserId"] = "001";
+                });
+
+            GetRefreshDto responseDto = new()
+            {
+                Token = jwtToken
+            };
+            
+            await Send.OkAsync(responseDto, ct);
+        }
+        catch
+        {
+            await Send.UnauthorizedAsync(ct);
+        }
+    }
+}