feat: move validate envoy gateway

Signed-off-by: bitliu <[email protected]>

api/v1alpha1/validation/envoygateway_validate.go

@@ -0,0 +1,87 @@
+// Copyright Envoy Gateway Authors
+// SPDX-License-Identifier: Apache-2.0
+// The full text of the Apache license is available in the LICENSE file at
+// the root of the repo.
+
+package validation
+
+import (
+	"errors"
+	"fmt"
+	"net/url"
+
+	gwapiv1 "sigs.k8s.io/gateway-api/apis/v1"
+
+	"github.com/envoyproxy/gateway/api/v1alpha1"
+)
+
+// Validate validates the provided EnvoyGateway.
+func ValidateEnvoyGateway(eg *v1alpha1.EnvoyGateway) error {
+	switch {
+	case eg == nil:
+		return errors.New("envoy gateway config is unspecified")
+	case eg.Gateway == nil:
+		return errors.New("gateway is unspecified")
+	case len(eg.Gateway.ControllerName) == 0:
+		return errors.New("gateway controllerName is unspecified")
+	case eg.Provider == nil:
+		return errors.New("provider is unspecified")
+	case eg.Provider.Type != v1alpha1.ProviderTypeKubernetes:
+		return fmt.Errorf("unsupported provider %v", eg.Provider.Type)
+	case eg.Logging != nil && len(eg.Logging.Level) != 0:
+		level := eg.Logging.Level
+		for component, logLevel := range level {
+			switch component {
+			case v1alpha1.LogComponentGatewayDefault,
+				v1alpha1.LogComponentProviderRunner,
+				v1alpha1.LogComponentGatewayAPIRunner,
+				v1alpha1.LogComponentXdsTranslatorRunner,
+				v1alpha1.LogComponentXdsServerRunner,
+				v1alpha1.LogComponentInfrastructureRunner,
+				v1alpha1.LogComponentGlobalRateLimitRunner:
+				switch logLevel {
+				case v1alpha1.LogLevelDebug, v1alpha1.LogLevelError, v1alpha1.LogLevelWarn, v1alpha1.LogLevelInfo:
+				default:
+					return errors.New("envoy gateway logging level invalid. valid options: info/debug/warn/error")
+				}
+			default:
+				return errors.New("envoy gateway logging components invalid. valid options: system/provider/gateway-api/xds-translator/xds-server/infrastructure")
+			}
+		}
+	case eg.RateLimit != nil:
+		if eg.RateLimit.Backend.Type != v1alpha1.RedisBackendType {
+			return fmt.Errorf("unsupported ratelimit backend %v", eg.RateLimit.Backend.Type)
+		}
+		if eg.RateLimit.Backend.Redis == nil || eg.RateLimit.Backend.Redis.URL == "" {
+			return fmt.Errorf("empty ratelimit redis settings")
+		}
+		if _, err := url.Parse(eg.RateLimit.Backend.Redis.URL); err != nil {
+			return fmt.Errorf("unknown ratelimit redis url format: %w", err)
+		}
+	case eg.ExtensionManager != nil:
+		if eg.ExtensionManager.Hooks == nil || eg.ExtensionManager.Hooks.XDSTranslator == nil {
+			return fmt.Errorf("registered extension has no hooks specified")
+		}
+
+		if len(eg.ExtensionManager.Hooks.XDSTranslator.Pre) == 0 && len(eg.ExtensionManager.Hooks.XDSTranslator.Post) == 0 {
+			return fmt.Errorf("registered extension has no hooks specified")
+		}
+
+		if eg.ExtensionManager.Service == nil {
+			return fmt.Errorf("extension service config is empty")
+		}
+
+		if eg.ExtensionManager.Service.TLS != nil {
+			certificateRefKind := eg.ExtensionManager.Service.TLS.CertificateRef.Kind
+
+			if certificateRefKind == nil {
+				return fmt.Errorf("certificateRef empty in extension service server TLS settings")
+			}
+
+			if *certificateRefKind != gwapiv1.Kind("Secret") {
+				return fmt.Errorf("unsupported extension server TLS certificateRef %v", certificateRefKind)
+			}
+		}
+	}
+	return nil
+}