Add clash mode support

experimental/clashapi/configs.go

@@ -2,6 +2,7 @@ package clashapi
 
 import (
 	"net/http"
+	"strings"
 
 	"github.com/sagernet/sing-box/log"
 
@@ -9,11 +10,11 @@ import (
 	"github.com/go-chi/render"
 )
 
-func configRouter(logFactory log.Factory) http.Handler {
+func configRouter(server *Server, logFactory log.Factory, logger log.Logger) http.Handler {
 	r := chi.NewRouter()
-	r.Get("/", getConfigs(logFactory))
+	r.Get("/", getConfigs(server, logFactory))
 	r.Put("/", updateConfigs)
-	r.Patch("/", patchConfigs)
+	r.Patch("/", patchConfigs(server, logger))
 	return r
 }
 
@@ -31,7 +32,7 @@ type configSchema struct {
 	Tun         map[string]any `json:"tun"`
 }
 
-func getConfigs(logFactory log.Factory) func(w http.ResponseWriter, r *http.Request) {
+func getConfigs(server *Server, logFactory log.Factory) func(w http.ResponseWriter, r *http.Request) {
 	return func(w http.ResponseWriter, r *http.Request) {
 		logLevel := logFactory.Level()
 		if logLevel == log.LevelTrace {
@@ -40,15 +41,31 @@ func getConfigs(logFactory log.Factory) func(w http.ResponseWriter, r *http.Requ
 			logLevel = log.LevelError
 		}
 		render.JSON(w, r, &configSchema{
-			Mode:        "rule",
+			Mode:        server.mode,
 			BindAddress: "*",
 			LogLevel:    log.FormatLevel(logLevel),
 		})
 	}
 }
 
-func patchConfigs(w http.ResponseWriter, r *http.Request) {
-	render.NoContent(w, r)
+func patchConfigs(server *Server, logger log.Logger) func(w http.ResponseWriter, r *http.Request) {
+	return func(w http.ResponseWriter, r *http.Request) {
+		var newConfig configSchema
+		err := render.DecodeJSON(r.Body, &newConfig)
+		if err != nil {
+			render.Status(r, http.StatusBadRequest)
+			render.JSON(w, r, ErrBadRequest)
+			return
+		}
+		if newConfig.Mode != "" {
+			mode := strings.ToLower(newConfig.Mode)
+			if server.mode != mode {
+				server.mode = mode
+				logger.Info("updated mode: ", mode)
+			}
+		}
+		render.NoContent(w, r)
+	}
 }
 
 func updateConfigs(w http.ResponseWriter, r *http.Request) {