fix(auth): do not panic with invalid openid provider configuration (#1354)

pkg/modules/auth/openid/providers_test.go

@@ -0,0 +1,86 @@
+// Vikunja is a to-do list application to facilitate your life.
+// Copyright 2018-present Vikunja and contributors. All rights reserved.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package openid
+
+import (
+	"testing"
+
+	"code.vikunja.io/api/pkg/config"
+	"code.vikunja.io/api/pkg/modules/keyvalue"
+)
+
+func TestGetAllProvidersTypeSafety(t *testing.T) {
+	// Clean up any existing providers
+	defer func() {
+		CleanupSavedOpenIDProviders()
+	}()
+
+	t.Run("should handle []interface{} without panic", func(t *testing.T) {
+		// Setup config with OpenID enabled
+		config.AuthOpenIDEnabled.Set(true)
+
+		// Mock the config value to be []interface{} which causes the original panic
+		configValue := []interface{}{
+			map[string]interface{}{
+				"name":         "test-provider",
+				"authurl":      "https://example.com/auth",
+				"clientid":     "test-client",
+				"clientsecret": "test-secret",
+			},
+		}
+		config.AuthOpenIDProviders.Set(configValue)
+
+		// Clear keyvalue cache to force reading from config
+		_ = keyvalue.Del("openid_providers")
+
+		// This should not panic, but should handle gracefully and return empty
+		providers, err := GetAllProviders()
+
+		// Should return empty providers since the config format is invalid
+		if err != nil {
+			t.Errorf("Expected no error, got: %v", err)
+		}
+
+		if len(providers) != 0 {
+			t.Errorf("Expected empty providers list, got: %d", len(providers))
+		}
+	})
+
+	t.Run("should handle other invalid types without panic", func(t *testing.T) {
+		// Setup config with OpenID enabled
+		config.AuthOpenIDEnabled.Set(true)
+
+		// Mock the config value to be a string (another invalid type)
+		configValue := "invalid-config"
+		config.AuthOpenIDProviders.Set(configValue)
+
+		// Clear keyvalue cache to force reading from config
+		_ = keyvalue.Del("openid_providers")
+
+		// This should not panic
+		providers, err := GetAllProviders()
+
+		// Should return empty providers since the config format is invalid
+		if err != nil {
+			t.Errorf("Expected no error, got: %v", err)
+		}
+
+		if len(providers) != 0 {
+			t.Errorf("Expected empty providers list, got: %d", len(providers))
+		}
+	})
+}