Implement token caching and refresh mechanism for auth.

Added distributed caching for access and refresh tokens in both `AuthController` and `AppProxyController`. Introduced logic to handle token expiration and refresh, ensuring continuous authorization through token renewal and session management.

src/dotnet/Suspectus.Gandalf.Bridgekeeper.Api/Controllers/AppProxyController.cs

@@ -1,9 +1,8 @@
 using System.Net;
 using System.Net.Http.Headers;
-using Microsoft.AspNetCore.Authentication;
 using Microsoft.AspNetCore.Mvc;
-using Microsoft.AspNetCore.Server.HttpSys;
 using Microsoft.Extensions.Caching.Distributed;
+using Suspectus.Gandalf.Core.Abstractions.DTOs.Internal.Auth;
 using Suspectus.Gandalf.Core.Abstractions.Extensions;
 using Suspectus.Gandalf.Palantir.Client;
 
@@ -50,6 +49,11 @@ public class AppProxyController : ControllerBase
 
         var token = await GetToken(sessionCookie, appId, cancellationToken);
 
+        if (token is null)
+        {
+            return Unauthorized("Session expired.");
+        }
+        
         _httpClient.BaseAddress = new Uri(appInfo.BaseAddress);
         _httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", token);
         
@@ -78,32 +82,82 @@ public class AppProxyController : ControllerBase
         return new EmptyResult();
     }
 
-    private async Task<string> GetToken(string subjectId, string appId, CancellationToken cancellationToken)
+    private async Task<string?> GetToken(string subjectId, string appId, CancellationToken cancellationToken)
     {
-        // TODO: Get actual token for subject and app
         var accessTokenCacheKey = GetCacheKey(subjectId, appId, "access_token");
         var accessToken = await _tokenCache.GetStringAsync(accessTokenCacheKey, cancellationToken);
 
         if (accessToken is not null)
+        {
             return accessToken;
+        }
+        
+        var refreshTokenCacheKey = GetCacheKey(subjectId, appId, "refresh_token");
+        var refreshToken = await _tokenCache.GetStringAsync(refreshTokenCacheKey, cancellationToken);
+
+        if (refreshToken is null)
+        {
+            return null;
+        }
+        
+        var tokenRequestCommandResponse = await _client.Internal.Auth.Token(new TokenRequestCommand
+        {
+            GrandType = GrandType.RefreshToken,
+            RefreshToken = refreshToken,
+            ClientId = appId
+        });
+
+        if (tokenRequestCommandResponse.IsFaulted)
+        {
+            return null;
+        }
+        
+        var tokenRequestResponse = tokenRequestCommandResponse.GetValue();
+        
+        if (tokenRequestResponse is null)
+        {
+            return null;
+        }
         
-        const string newToken = "totallyARealToken"; // Replace with actual token retrieval logic
         await _tokenCache.SetStringAsync(
             accessTokenCacheKey,
-            newToken,
+            tokenRequestResponse.AccessToken,
             new DistributedCacheEntryOptions
             {
-                AbsoluteExpiration = DateTimeOffset.UtcNow.AddMinutes(1),
+                AbsoluteExpiration = tokenRequestResponse.AccessTokenExpiresAt.AddSeconds(-10),
             },
             cancellationToken
         );
-        accessToken =  newToken;
 
-        return accessToken;
+        var refreshTokenCacheExpiration = tokenRequestResponse.RefreshTokenExpiresAt.AddSeconds(-10);
+        
+        await _tokenCache.SetStringAsync(
+            refreshTokenCacheKey,
+            tokenRequestResponse.RefreshToken,
+            new DistributedCacheEntryOptions
+            {
+                AbsoluteExpiration = refreshTokenCacheExpiration,
+            },
+            cancellationToken
+        );
+        
+        UpdateSessionCookie(subjectId, refreshTokenCacheExpiration);
+        return tokenRequestResponse.AccessToken;
     }
 
     private string GetCacheKey(string subjectId, string appId, string tokenType)
     {
         return $"{subjectId}:{appId}:{tokenType}";
     }
+    
+    private void UpdateSessionCookie(string subjectId, DateTimeOffset refreshTokenCacheExpiration)
+    {
+        Response.Cookies.Append("MithrandirSession", subjectId, new CookieOptions
+        {
+            Secure = true,
+            HttpOnly = true,
+            SameSite = SameSiteMode.Lax,
+            Expires = refreshTokenCacheExpiration
+        });
+    }
 }

src/dotnet/Suspectus.Gandalf.Bridgekeeper.Api/Controllers/AuthController.cs

@@ -1,7 +1,9 @@
 using Microsoft.AspNetCore.Mvc;
+using Microsoft.Extensions.Caching.Distributed;
 using Suspectus.Gandalf.Core.Abstractions.CQRS.Commands;
+using Suspectus.Gandalf.Core.Abstractions.DTOs.Internal.Auth;
+using Suspectus.Gandalf.Core.Abstractions.Extensions;
 using Suspectus.Gandalf.Palantir.Client;
-using Suspectus.Gandalf.Palantir.Contracts.Controller.Auth;
 
 namespace Suspectus.Gandalf.Bridgekeeper.Api.Controllers;
 
@@ -10,10 +12,12 @@ namespace Suspectus.Gandalf.Bridgekeeper.Api.Controllers;
 public class AuthController : ControllerBase
 {
     private readonly IPalantirClient _client;
+    private readonly IDistributedCache _tokenCache;
 
-    public AuthController(IPalantirClient client)
+    public AuthController(IPalantirClient client, IDistributedCache tokenCache)
     {
         _client = client;
+        _tokenCache = tokenCache;
     }
 
     [HttpGet("[action]")]
@@ -23,28 +27,72 @@ public class AuthController : ControllerBase
     }
 
     [HttpPost("[action]")]
-    public async Task<IActionResult> Login([FromBody] LoginCommand loginCommand)
+    public async Task<IActionResult> Login([FromBody] ValidateCredentialsCommand validateCredentialsCommand, [FromQuery] string? clientId, CancellationToken cancellationToken)
     {
-        var validationResult = await _client.Internal.Auth.ValidateCredentials(new ValidateCredentialsCommand { Password = loginCommand.Password, UsernameOrEmail = loginCommand.UsernameOrEmail });
+        if (clientId is null)
+        {
+            var masterAppInfoResponse = await _client.Internal.App.GetMasterInfo();
 
-        return validationResult.Match<IActionResult>(valid =>
+            if (masterAppInfoResponse.IsFaulted)
             {
-                if (!valid)
+                return BadRequest($"Failed to retrieve master app info.");
-                {
+            }
-                    return BadRequest("Invalid username or password.");
-                }
 
-                Response.Cookies.Append("MithrandirSession", loginCommand.UsernameOrEmail, new CookieOptions
+            clientId = masterAppInfoResponse.GetValue().Id;
-                {
+        }
-                    Secure = true,
-                    HttpOnly = true,
-                    SameSite = SameSiteMode.Lax,
-                    Expires = DateTime.UtcNow.AddMinutes(30)
-                });
 
-                return Ok();
+        var tokenRequestCommandResponse = await _client.Internal.Auth.Token(new TokenRequestCommand
-            }, e => BadRequest($"{e.Message}\n{e.InnerException?.Message}")
+        {
+            Password = validateCredentialsCommand.Password,
+            Username = validateCredentialsCommand.UsernameOrEmail,
+            GrandType = GrandType.Password,
+            ClientId = clientId
+        });
+
+        if (tokenRequestCommandResponse.IsFaulted)
+        {
+            return tokenRequestCommandResponse.Match<IActionResult>(
+                BadRequest,
+                e => BadRequest($"{e.Message}\n{e.InnerException?.Message}")
+            );
+        }
+
+        var tokenRequestResponse = tokenRequestCommandResponse.GetValue();
+
+        if (tokenRequestResponse is null)
+        {
+            return BadRequest("Invalid username or password.");
+        }
+
+        await _tokenCache.SetStringAsync(
+            GetCacheKey(tokenRequestResponse.SubjectId, clientId, "access_token"),
+            tokenRequestResponse.AccessToken,
+            new DistributedCacheEntryOptions
+            {
+                AbsoluteExpiration = tokenRequestResponse.AccessTokenExpiresAt.AddSeconds(-10),
+            },
+            cancellationToken
         );
+        
+        await _tokenCache.SetStringAsync(
+            GetCacheKey(tokenRequestResponse.SubjectId, clientId, "refresh_token"),
+            tokenRequestResponse.RefreshToken,
+            new DistributedCacheEntryOptions
+            {
+                AbsoluteExpiration = tokenRequestResponse.RefreshTokenExpiresAt.AddSeconds(-10),
+            },
+            cancellationToken
+        );
+
+        Response.Cookies.Append("MithrandirSession", tokenRequestResponse.SubjectId, new CookieOptions
+        {
+            Secure = true,
+            HttpOnly = true,
+            SameSite = SameSiteMode.Lax,
+            Expires = tokenRequestResponse.RefreshTokenExpiresAt.AddSeconds(-10)
+        });
+
+        return Ok();
     }
 
     [HttpGet("[action]")]
@@ -60,4 +108,9 @@ public class AuthController : ControllerBase
     {
         return Ok(true);
     }
+
+    private string GetCacheKey(string subjectId, string appId, string tokenType)
+    {
+        return $"{subjectId}:{appId}:{tokenType}";
+    }
 }