You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: setting_apply.go
    path of file: ./repos/Artalk/server/handler
    
    the code of the file until where you have to start completion: package handler

import (
	"os"

	"github.com/ArtalkJS/Artalk/internal/config"
	"github.com/ArtalkJS/Artalk/internal/core"
	"github.com/ArtalkJS/Artalk/internal/i18n"
	"github.com/ArtalkJS/Artalk/internal/log"
	"github.com/ArtalkJS/Artalk/server/common"
	"github.com/gofiber/fiber/v2"
)

type ParamsSettingApply struct {
	Yaml string `json:"yaml" validate:"required"` // The content of the config file in YAML format
}

// @Id           ApplySettings
// @Summary      Save and apply Settings
// @Description  Apply settings and restart the server
// @Tags         System
// @Security     ApiKeyAuth
// @Param        settings  body  ParamsSettingApply  true "The settings"
// @Accept       json
// @Produce      json
// @Success      200  {object}  Map{
    
func SettingApply(app *core.App, router fiber.Router) {
	router.Put("/settings", common.AdminGuard(app, func(c *fiber.Ctx) error {
		var p ParamsSettingApply
		if isOK, resp := common.ParamsDecode(c, &p); !isOK {
			return resp
		}

		configFile := app.Conf().GetCfgFileLoaded()
		f, err := os.Create(configFile)
		if err != nil {
			return common.RespError(c, 500, i18n.T("Config file read failed")+": "+err.Error())
		}

		defer f.Close()

		_, err2 := f.WriteString(p.Yaml)
		if err2 != nil {
			return common.RespError(c, 500, i18n.T("Save failed")+": "+err2.Error())
		}

		// 应用新配置文件
		conf, err := config.NewFromFile(configFile)
		if err != nil {
			return common.RespError(c, 500, "Config instance err: "+err.Error())
		}

		app.SetConf(conf)

		// 重启服务
		if err := app.Restart(); err != nil {
			return common.RespError(c, 500, i18n.T("Restart failed: {{err}}", map[string]interface{}{"err": err.Error()}))
		}

		log.Info("[Apply Settings] " + i18n.T("Services restart complete"))

		return common.RespSuccess(c)
	}))
}