From a1b11a6adb85b2a77eee6538f9fbf9e0172bf00d Mon Sep 17 00:00:00 2001
From: Sebastian Tobie <sebastian@sebastian-tobie.de>
Date: Tue, 19 Jan 2021 23:44:35 +0100
Subject: [PATCH] added a menu modul.

this module make it easier to use templating.
---
 http.go        |  8 +++++++
 menus/menus.go | 61 ++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 69 insertions(+)
 create mode 100644 menus/menus.go

diff --git a/http.go b/http.go
index 48cc766..a497475 100644
--- a/http.go
+++ b/http.go
@@ -9,6 +9,7 @@ import (
 	"github.com/pelletier/go-toml"
 	"github.com/phuslu/log"
 	"go.sebtobie.de/httpserver/auth"
+	"go.sebtobie.de/httpserver/menus"
 )
 
 // Config that is used to map the toml config to the settings that are used.
@@ -32,6 +33,7 @@ type Server struct {
 	config *toml.Tree
 	authhf auth.AuthenticationHandler
 	sites  []Site
+	menus  []menus.Menu
 }
 
 // StartServer starts the server as configured and sends the errormessage to the log.
@@ -79,6 +81,7 @@ func CreateServer(config *toml.Tree) *Server {
 	gin.DebugPrintRouteFunc = func(httpMethod, absolutePath, handlerName string, nuHandlers int) {
 		log.Trace().Msgf("%-4s(%02d): %-20s %s", httpMethod, nuHandlers-1, absolutePath, handlerName)
 	}
+	server.menus = []menus.Menu{}
 	return server
 }
 
@@ -112,5 +115,10 @@ type Site interface {
 func (s *Server) RegisterSite(path string, site Site) {
 	site.Init(s.router.Group(path))
 	s.sites = append(s.sites, site)
+	if ms, ok := site.(menus.MenuSite); ok {
+		menus := ms.Menu()
+		log.Debug().Msgf("%d menus are added", len(menus))
+		s.menus = append(s.menus, menus...)
+	}
 	return
 }
diff --git a/menus/menus.go b/menus/menus.go
new file mode 100644
index 0000000..dbcd930
--- /dev/null
+++ b/menus/menus.go
@@ -0,0 +1,61 @@
+package menus
+
+import (
+	"net/url"
+
+	"go.sebtobie.de/httpserver/auth"
+)
+
+// Menu is an Interface to give the server infos about menuitems
+type Menu interface {
+	Name() string
+	AltText() string
+	URL() *url.URL
+	Children() []Menu
+	Enabled(auth.Account) bool
+}
+
+// MenuSite is an interface that is fullfilled by sites to return an type of menu.
+type MenuSite interface {
+	Menu() []Menu
+}
+
+// MenuItem is an Implementation of the Menu Interface
+// Enabled returns always true
+type MenuItem struct {
+	ItemName     string
+	ItemAltText  string
+	ItemURL      *url.URL
+	ItemChildren []Menu
+}
+
+// Name returns the name of the Item.
+func (m *MenuItem) Name() string {
+	return m.ItemName
+}
+
+// AltText is for hovertext or Descriptions. Its can return "".
+// to make templatemaking easier i decided to make an return required.
+func (m *MenuItem) AltText() string {
+	return m.ItemAltText
+}
+
+// URL returns the full URL of the item.
+func (m *MenuItem) URL() *url.URL {
+	return m.ItemURL
+}
+
+// Children returns the ItemChildren or an empty Menu-Arry if ItemChildren is nil
+func (m *MenuItem) Children() []Menu {
+	if m.ItemChildren == nil {
+		return []Menu{}
+	}
+	return m.ItemChildren
+}
+
+// Enabled returns always true
+func (*MenuItem) Enabled(auth.Account) bool {
+	return true
+}
+
+var _ Menu = &MenuItem{}