support yaml/json/toml configuration format, make ini deprecated (#3599)

pkg/config/v1/validation/visitor.go

@@ -0,0 +1,59 @@
+// Copyright 2023 The frp Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package validation
+
+import (
+	"errors"
+	"fmt"
+
+	"github.com/samber/lo"
+
+	v1 "github.com/fatedier/frp/pkg/config/v1"
+)
+
+func ValidateVisitorConfigurer(c v1.VisitorConfigurer) error {
+	base := c.GetBaseConfig()
+	if err := validateVisitorBaseConfig(base); err != nil {
+		return err
+	}
+
+	switch v := c.(type) {
+	case *v1.STCPVisitorConfig:
+	case *v1.SUDPVisitorConfig:
+	case *v1.XTCPVisitorConfig:
+		return validateXTCPVisitorConfig(v)
+	default:
+		return errors.New("unknown visitor config type")
+	}
+	return nil
+}
+
+func validateVisitorBaseConfig(c *v1.VisitorBaseConfig) error {
+	if c.Name == "" {
+		return errors.New("name should not be empty")
+	}
+
+	if c.BindPort == 0 {
+		return errors.New("bind port is required")
+	}
+	return nil
+}
+
+func validateXTCPVisitorConfig(c *v1.XTCPVisitorConfig) error {
+	if !lo.Contains([]string{"kcp", "quic"}, c.Protocol) {
+		return fmt.Errorf("protocol should be kcp or quic")
+	}
+	return nil
+}