Fix: LogtoCookieContextManager setting double slash in fetch token request uri

src/Logto.AspNetCore.Authentication.Tests/LogtoCookieContextManagerTests.cs

@@ -0,0 +1,31 @@
+namespace Logto.AspNetCore.Authentication.Tests;
+
+public class LogtoCookieContextManagerTests
+{
+    [Theory]
+    [InlineData("https://www.example.com/", "https://www.example.com/oidc/token")]
+    [InlineData("https://www.example.com", "https://www.example.com/oidc/token")]
+    [InlineData("https://example.com", "https://example.com/oidc/token")]
+    [InlineData("http://www.example.com", "http://www.example.com/oidc/token")]
+    [InlineData("https://sub.example.com", "https://sub.example.com/oidc/token")]
+    [InlineData("https://www.example.com/path/", "https://www.example.com/path/oidc/token")]
+    public void FetchTokenUriParseTest(string endpoint, string expectedUri)
+    {
+        var requestUri = LogtoCookieContextManager.GetOidcTokenRequestUri(endpoint);
+        Assert.Equal(requestUri.ToString(), expectedUri);
+    }
+
+    [Fact]
+    public void FetchTokenUriInvalidFormatTest()
+    {
+        Assert.Throws<UriFormatException>(() => LogtoCookieContextManager.GetOidcTokenRequestUri("https:///example.com//"));
+    }
+
+    [Fact]
+    public void FetchTokenUriNullOrEmptyTest()
+    {
+        Assert.Throws<ArgumentNullException>(() => LogtoCookieContextManager.GetOidcTokenRequestUri(null!));
+        Assert.Throws<UriFormatException>(() => LogtoCookieContextManager.GetOidcTokenRequestUri(string.Empty));
+    }
+
+}

src/Logto.AspNetCore.Authentication/LogtoCookieContextManager.cs

@@ -8,6 +8,7 @@
 using Microsoft.AspNetCore.Authentication;
 using Microsoft.AspNetCore.Authentication.Cookies;
 using Microsoft.AspNetCore.Authentication.OpenIdConnect;
+using Microsoft.AspNetCore.Http.Extensions;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Options;
 
@@ -78,7 +79,6 @@ public async Task Handle()
     if (logtoOptions.Resource != null && !await RefreshTokens(true))
     {
       context.RejectPrincipal();
-      return;
     }
   }
 
@@ -177,7 +177,7 @@ public async Task<LogtoTokenResponse> FetchTokensByRefreshToken(string refreshTo
     }
 
     // TODO: The token endpoint should be read from the discovery endpoint or the OpenID Connect context.
-    var request = new HttpRequestMessage(HttpMethod.Post, $"{logtoOptions.Endpoint}/oidc/token")
+    var request = new HttpRequestMessage(HttpMethod.Post, GetOidcTokenRequestUri(logtoOptions.Endpoint))
     {
       Content = new FormUrlEncodedContent(body)
     };
@@ -191,4 +191,17 @@ public async Task<LogtoTokenResponse> FetchTokensByRefreshToken(string refreshTo
       PropertyNameCaseInsensitive = true,
     })!;
   }
+
+  /// <summary>
+  /// Constructs a URI for the OpenID Connect (OIDC) token request based on the provided endpoint.
+  /// </summary>
+  /// <param name="endpoint">The base endpoint URL as a string.</param>
+  /// <returns>A <see cref="Uri"/> object representing the full token request URI.</returns>
+  /// <exception cref="UriFormatException">Thrown when the provided endpoint is not a valid URI.</exception>
+  public static Uri GetOidcTokenRequestUri(string endpoint)
+  {
+    var baseUri = new Uri(endpoint);
+    var requestUri = new Uri(baseUri, "oidc/token");
+    return requestUri;
+  }
 }