add persistent proxy/visitor store with CRUD API and web UI (#5188)

pkg/config/v1/common.go

@@ -15,15 +15,15 @@
 package v1
 
 import (
+	"maps"
 	"sync"
 
 	"github.com/fatedier/frp/pkg/util/util"
 )
 
-// TODO(fatedier): Due to the current implementation issue of the go json library, the UnmarshalJSON method
-// of a custom struct cannot access the DisallowUnknownFields parameter of the parent decoder.
-// Here, a global variable is temporarily used to control whether unknown fields are allowed.
-// Once the v2 version is implemented by the community, we can switch to a standardized approach.
+// TODO(fatedier): Migrate typed config decoding to encoding/json/v2 when it is stable for production use.
+// The current encoding/json(v1) path cannot propagate DisallowUnknownFields into custom UnmarshalJSON
+// methods, so we temporarily keep this global strictness flag protected by a mutex.
 //
 // https://github.com/golang/go/issues/41144
 // https://github.com/golang/go/discussions/63397
@@ -32,6 +32,19 @@ var (
 	DisallowUnknownFieldsMu sync.Mutex
 )
 
+// WithDisallowUnknownFields temporarily overrides typed config JSON strictness.
+// It restores the previous value before returning.
+func WithDisallowUnknownFields(disallow bool, fn func() error) error {
+	DisallowUnknownFieldsMu.Lock()
+	prev := DisallowUnknownFields
+	DisallowUnknownFields = disallow
+	defer func() {
+		DisallowUnknownFields = prev
+		DisallowUnknownFieldsMu.Unlock()
+	}()
+	return fn()
+}
+
 type AuthScope string
 
 const (
@@ -104,6 +117,14 @@ type NatTraversalConfig struct {
 	DisableAssistedAddrs bool `json:"disableAssistedAddrs,omitempty"`
 }
 
+func (c *NatTraversalConfig) Clone() *NatTraversalConfig {
+	if c == nil {
+		return nil
+	}
+	out := *c
+	return &out
+}
+
 type LogConfig struct {
 	// This is destination where frp should write the logs.
 	// If "console" is used, logs will be printed to stdout, otherwise,
@@ -138,6 +159,12 @@ type HeaderOperations struct {
 	Set map[string]string `json:"set,omitempty"`
 }
 
+func (o HeaderOperations) Clone() HeaderOperations {
+	return HeaderOperations{
+		Set: maps.Clone(o.Set),
+	}
+}
+
 type HTTPHeader struct {
 	Name  string `json:"name"`
 	Value string `json:"value"`