luci-base: implement JSON endpoint to fetch menu information

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

modules/luci-base/luasrc/controller/admin/index.lua

@@ -182,3 +182,15 @@ function action_ubus()
 	luci.http.prepare_content("application/json")
 	luci.http.write_json(response)
 end
+
+function action_menu()
+	local dsp = require "luci.dispatcher"
+	local utl = require "luci.util"
+	local http = require "luci.http"
+
+	local acls = utl.ubus("session", "access", { ubus_rpc_session = http.getcookie("sysauth") })
+	local menu = dsp.menu_json(acls or {}) or {}
+
+	http.prepare_content("application/json")
+	http.write_json(menu)
+end

modules/luci-base/root/usr/share/luci/menu.d/luci-base.json

@@ -136,5 +136,14 @@
 			"function": "action_confirm"
 		},
 		"auth": {}
+	},
+
+	"admin/menu": {
+		"action": {
+			"type": "call",
+			"module": "luci.controller.admin.index",
+			"function": "action_menu"
+		},
+		"auth": {}
 	}
 }