[APIV4] GET /config - getConfig endpoint for apiV4 (#5701)

api4/system.go

@@ -7,6 +7,8 @@ import (
 	"net/http"
 
 	l4g "github.com/alecthomas/log4go"
+	"github.com/mattermost/platform/app"
+	"github.com/mattermost/platform/model"
 	"github.com/mattermost/platform/utils"
 )
 
@@ -14,8 +16,21 @@ func InitSystem() {
 	l4g.Debug(utils.T("api.system.init.debug"))
 
 	BaseRoutes.System.Handle("/ping", ApiHandler(getSystemPing)).Methods("GET")
+	BaseRoutes.ApiRoot.Handle("/config", ApiSessionRequired(getConfig)).Methods("GET")
 }
 
 func getSystemPing(c *Context, w http.ResponseWriter, r *http.Request) {
 	ReturnStatusOK(w)
 }
+
+func getConfig(c *Context, w http.ResponseWriter, r *http.Request) {
+	if !app.SessionHasPermissionTo(c.Session, model.PERMISSION_MANAGE_SYSTEM) {
+		c.SetPermissionError(model.PERMISSION_MANAGE_SYSTEM)
+		return
+	}
+
+	cfg := app.GetConfig()
+
+	w.Header().Set("Cache-Control", "no-cache, no-store, must-revalidate")
+	w.Write([]byte(cfg.ToJson()))
+}