config: add some validations (#3610)

pkg/config/v1/validation/common.go

@@ -17,6 +17,8 @@ package validation
 import (
 	"fmt"
 
+	"github.com/samber/lo"
+
 	v1 "github.com/fatedier/frp/pkg/config/v1"
 )
 
@@ -29,13 +31,21 @@ func validateWebServerConfig(c *v1.WebServerConfig) error {
 			return fmt.Errorf("tls.keyFile must be specified when tls is enabled")
 		}
 	}
-	return nil
+
+	return ValidatePort(c.Port, "webServer.port")
 }
 
 // ValidatePort checks that the network port is in range
-func ValidatePort(port int) error {
+func ValidatePort(port int, fieldPath string) error {
 	if 0 <= port && port <= 65535 {
 		return nil
 	}
-	return fmt.Errorf("port number %d must be in the range 0..65535", port)
+	return fmt.Errorf("%s: port number %d must be in the range 0..65535", fieldPath, port)
+}
+
+func validateLogConfig(c *v1.LogConfig) error {
+	if !lo.Contains(supportedLogLevels, c.Level) {
+		return fmt.Errorf("invalid log level, optional values are %v", supportedLogLevels)
+	}
+	return nil
 }