Refactor authentication services and implement JWT validation logic

src/Core/API/API.Core/Controllers/AuthController.cs

@@ -11,8 +11,8 @@ namespace API.Core.Controllers
     public class AuthController(
         IRegisterService registerService,
         ILoginService loginService,
-        IConfirmationService confirmationService)
-        : ControllerBase
+        IConfirmationService confirmationService
+    ) : ControllerBase
     {
         [HttpPost("register")]
         public async Task<ActionResult<UserAccount>> Register(
@@ -69,13 +69,16 @@ namespace API.Core.Controllers
         public async Task<ActionResult> Confirm([FromQuery] string token)
         {
             var rtn = await confirmationService.ConfirmUserAsync(token);
-            return Ok(new ResponseBody<ConfirmationPayload>
-            {
-                Message = "User with ID " + rtn.userId + " is confirmed.",
-                Payload = new ConfirmationPayload(
-                    rtn.userId, rtn.confirmedAt
-                )
-            });
+            return Ok(
+                new ResponseBody<ConfirmationPayload>
+                {
+                    Message = "User with ID " + rtn.userId + " is confirmed.",
+                    Payload = new ConfirmationPayload(
+                        rtn.userId,
+                        rtn.confirmedAt
+                    ),
+                }
+            );
         }
     }
-}
+}

src/Core/API/API.Core/Program.cs

@@ -14,8 +14,8 @@ using Infrastructure.Repository.UserAccount;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.AspNetCore.Mvc.Filters;
 using Service.Auth;
-using Service.UserManagement.User;
 using Service.Emails;
+using Service.UserManagement.User;
 
 var builder = WebApplication.CreateBuilder(args);
 

src/Core/Infrastructure/Infrastructure.Jwt/ITokenInfrastructure.cs

@@ -1,3 +1,5 @@
+using System.Security.Claims;
+
 namespace Infrastructure.Jwt;
 
 public interface ITokenInfrastructure
@@ -8,4 +10,6 @@ public interface ITokenInfrastructure
         DateTime expiry,
         string secret
     );
-}
+
+    Task<ClaimsPrincipal> ValidateJwtAsync(string token, string secret);
+}

src/Core/Infrastructure/Infrastructure.Jwt/Infrastructure.Jwt.csproj

@@ -16,4 +16,8 @@
       Version="8.2.1"
     />
   </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\Domain.Exceptions\Domain.Exceptions.csproj" />
+  </ItemGroup>
 </Project>

src/Core/Infrastructure/Infrastructure.Jwt/JwtInfrastructure.cs

@@ -3,6 +3,7 @@ using System.Text;
 using Microsoft.IdentityModel.JsonWebTokens;
 using Microsoft.IdentityModel.Tokens;
 using JwtRegisteredClaimNames = System.IdentityModel.Tokens.Jwt.JwtRegisteredClaimNames;
+using Domain.Exceptions;
 
 namespace Infrastructure.Jwt;
 
@@ -16,16 +17,19 @@ public class JwtInfrastructure : ITokenInfrastructure
     )
     {
         var handler = new JsonWebTokenHandler();
-
-        var key = Encoding.UTF8.GetBytes(
-            secret ?? throw new InvalidOperationException("secret not set")
-        );
-
-        // Base claims (always present)
+        var key = Encoding.UTF8.GetBytes(secret);
         var claims = new List<Claim>
         {
             new(JwtRegisteredClaimNames.Sub, userId.ToString()),
             new(JwtRegisteredClaimNames.UniqueName, username),
+            new(
+                JwtRegisteredClaimNames.Iat,
+                DateTimeOffset.UtcNow.ToUnixTimeSeconds().ToString()
+            ),
+            new(
+                JwtRegisteredClaimNames.Exp,
+                new DateTimeOffset(expiry).ToUnixTimeSeconds().ToString()
+            ),
             new(JwtRegisteredClaimNames.Jti, Guid.NewGuid().ToString()),
         };
 
@@ -41,4 +45,36 @@ public class JwtInfrastructure : ITokenInfrastructure
 
         return handler.CreateToken(tokenDescriptor);
     }
-}
+
+
+    public async Task<ClaimsPrincipal> ValidateJwtAsync(
+        string token,
+        string secret
+    )
+    {
+        var handler = new JsonWebTokenHandler();
+        var keyBytes = Encoding.UTF8.GetBytes(
+            secret
+        );
+        var parameters = new TokenValidationParameters
+        {
+            ValidateIssuer = false,
+            ValidateAudience = false,
+            ValidateLifetime = true,
+            IssuerSigningKey = new SymmetricSecurityKey(keyBytes),
+        };
+
+        try
+        {
+            var result = await handler.ValidateTokenAsync(token, parameters);
+            if (!result.IsValid || result.ClaimsIdentity == null)
+                throw new UnauthorizedAccessException();
+            
+            return new ClaimsPrincipal(result.ClaimsIdentity);
+        }
+        catch (Exception e)
+        {
+            throw new UnauthorizedException("Invalid token");
+        }
+    }
+}

src/Core/Service/Service.Auth/IConfirmationService.cs

@@ -10,12 +10,13 @@ public interface IConfirmationService
     Task<ConfirmationServiceReturn> ConfirmUserAsync(string confirmationToken);
 }
 
-
-public class ConfirmationService(IAuthRepository authRepository) : IConfirmationService
+public class ConfirmationService(IAuthRepository authRepository)
+    : IConfirmationService
 {
-
-    public async Task<ConfirmationServiceReturn> ConfirmUserAsync(string confirmationToken)
+    public async Task<ConfirmationServiceReturn> ConfirmUserAsync(
+        string confirmationToken
+    )
     {
         return new ConfirmationServiceReturn(DateTime.Now, Guid.NewGuid());
     }
-}
+}

src/Core/Service/Service.Auth/ITokenService.cs

@@ -3,11 +3,21 @@ using Infrastructure.Jwt;
 
 namespace Service.Auth;
 
+public enum TokenType
+{
+    AccessToken,
+    RefreshToken,
+    ConfirmationToken,
+}
+
 public interface ITokenService
 {
     public string GenerateAccessToken(UserAccount user);
     public string GenerateRefreshToken(UserAccount user);
     public string GenerateConfirmationToken(UserAccount user);
+
+    public string GenerateToken<T>(UserAccount user)
+        where T : struct, Enum;
 }
 
 public static class TokenServiceExpirationHours
@@ -76,4 +86,28 @@ public class TokenService(ITokenInfrastructure tokenInfrastructure)
             _confirmationTokenSecret
         );
     }
+
+    public string GenerateToken<T>(UserAccount userAccount)
+        where T : struct, Enum
+    {
+        var tokenType = typeof(T);
+        if (tokenType == typeof(TokenType))
+        {
+            var tokenTypeValue = (TokenType)
+                Enum.Parse(tokenType, typeof(T).Name);
+            return tokenTypeValue switch
+            {
+                TokenType.AccessToken => GenerateAccessToken(userAccount),
+                TokenType.RefreshToken => GenerateRefreshToken(userAccount),
+                TokenType.ConfirmationToken => GenerateConfirmationToken(
+                    userAccount
+                ),
+                _ => throw new InvalidOperationException("Invalid token type"),
+            };
+        }
+        else
+        {
+            throw new InvalidOperationException("Invalid token type");
+        }
+    }
 }