auth token endpoint added

TimetableDesigner.Backend.Services.Authentication.Core/Commands/AuthToken/AuthTokenHandler.cs

@@ -0,0 +1,39 @@
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+using TimetableDesigner.Backend.Services.Authentication.Core.Helpers;
+using TimetableDesigner.Backend.Services.Authentication.Database;
+using TimetableDesigner.Backend.Services.Authentication.Database.Model;
+
+namespace TimetableDesigner.Backend.Services.Authentication.Core.Commands.AuthToken;
+
+public class AuthTokenHandler : IRequestHandler<AuthTokenCommand, AuthTokenResult>
+{
+    private readonly DatabaseContext _databaseContext;
+    private readonly IAccessTokenGenerator _accessTokenGenerator;
+
+    public AuthTokenHandler(DatabaseContext databaseContext, IAccessTokenGenerator accessTokenGenerator)
+    {
+        _databaseContext = databaseContext;
+        _accessTokenGenerator = accessTokenGenerator;
+    }
+    
+    public async Task<AuthTokenResult> Handle(AuthTokenCommand request, CancellationToken cancellationToken)
+    {
+        RefreshToken? token = await _databaseContext.RefreshTokens
+                                                    .Include(x => x.Account)
+                                                    .FirstOrDefaultAsync(x => x.Token == Guid.Parse(request.RefreshToken), cancellationToken);
+        if (token is null || token.ExpirationDate < DateTimeOffset.UtcNow || !_accessTokenGenerator.ValidateExpiredAccessToken(request.AccessToken))
+        {
+            return AuthTokenResult.Failure();
+        }
+        
+        string accessToken = _accessTokenGenerator.GenerateAccessToken(token.Account);
+        if (token.IsExtendable)
+        {
+            
+        }
+        
+
+        return AuthTokenResult.Success(refreshToken, accessToken);
+    }
+}