review fixes apr 2026 (#130)

* Multiple fixes

- refresh coordinator dedup + memory pressure wire
- middleware sse consolidation + timer leak + claim cache
- universal cache sync backfill + isDebug gate
- lazy background task race
- memory monitor stw cached + refresh() api

* fix(auth): suppress OIDC redirects on non-navigation requests

- [x] Add isNonNavigationRequest using Sec-Fetch-Mode and Accept headers
- [x] Add comprehensive TestIsNonNavigationRequest
- [x] Update ServeHTTP to 401 non-navigation and AJAX requests

Fixes #129

* feat(config): add custom CA and insecure skip verify for OIDC TLS

- [x] Add CACertPath, CACertPEM, InsecureSkipVerify to Config
- [x] Implement loadCACertPool for CA bundle loading
- [x] Update HTTPClientConfig with RootCAs and InsecureSkipVerify
- [x] Apply CA pool and skip verify to pooled HTTP clients
- [x] Enhance configKey to distinguish TLS configs
- [x] Add comprehensive ca_cert_test.go

Fixes #125

* feat(oidc): add custom CA certificate support for private OIDC providers

- [x] Add caCertPath, caCertPEM, insecureSkipVerify config options
- [x] Update traefik.yml with new OIDC client config fields
- [x] Add configuration schema descriptions for new options
- [x] Update README table and add Custom CA Certificates section

* Fix the documentation.

* test(redis): add oversized argument rejection test

- [x] Add TestRedisConn_RejectOversizedArgumentBytes
- [x] Import strings package

* Dependencies cleanup

internal/cache/backends/redis_pool_test.go

@@ -3,6 +3,7 @@ package backends
 import (
 	"context"
 	"errors"
+	"strings"
 	"sync"
 	"testing"
 	"time"
@@ -617,4 +618,33 @@ func TestRedisConn_TooManyArguments(t *testing.T) {
 			assert.NotContains(t, err.Error(), "too many arguments")
 		}
 	})
+
+}
+
+// TestRedisConn_RejectOversizedArgumentBytes is a regression test for CodeQL
+// alert #10 (go/allocation-size-overflow). A single argument larger than
+// maxTotalArgBytes (64 MiB) must be rejected by the per-argument overflow
+// guard in Do() before any allocation is attempted.
+func TestRedisConn_RejectOversizedArgumentBytes(t *testing.T) {
+	mr := NewMiniredisServer(t)
+
+	pool, err := NewConnectionPool(&PoolConfig{
+		Address:        mr.GetAddr(),
+		MaxConnections: 1,
+		ConnectTimeout: 5 * time.Second,
+		ReadTimeout:    3 * time.Second,
+		WriteTimeout:   3 * time.Second,
+	})
+	require.NoError(t, err)
+	defer pool.Close()
+
+	conn, err := pool.Get(context.Background())
+	require.NoError(t, err)
+	defer pool.Put(conn)
+
+	largeArg := strings.Repeat("x", (64<<20)+1)
+
+	_, err = conn.Do("SET", "k", largeArg)
+	require.Error(t, err)
+	assert.Contains(t, err.Error(), "arguments too large")
 }

internal/providers/registry.go

@@ -147,7 +147,8 @@ func (r *ProviderRegistry) detectProviderUnsafe(issuerURL string) OIDCProvider {
 				return p
 			}
 		case ProviderTypeKeycloak:
-			if strings.Contains(host, "keycloak") || strings.Contains(normalizedURL.Path, "/auth/realms/") {
+			// Match both Keycloak <17 (`/auth/realms/`) and 17+ (`/realms/`).
+			if strings.Contains(host, "keycloak") || strings.Contains(normalizedURL.Path, "/realms/") {
 				return p
 			}
 		case ProviderTypeAWSCognito:

internal/providers/registry_test.go

@@ -225,10 +225,15 @@ func TestProviderRegistry_DetectProvider(t *testing.T) {
 			expected:  oktaProvider,
 		},
 		{
-			name:      "Keycloak provider detection",
+			name:      "Keycloak provider detection (legacy /auth/realms/)",
 			issuerURL: "https://auth.example.com/auth/realms/master",
 			expected:  keycloakProvider,
 		},
+		{
+			name:      "Keycloak provider detection (modern /realms/, KC 17+)",
+			issuerURL: "https://auth.example.com/realms/master",
+			expected:  keycloakProvider,
+		},
 		{
 			name:      "AWS Cognito provider detection",
 			issuerURL: "https://cognito-idp.us-east-1.amazonaws.com/us-east-1_example",