add 404 handler for admin

_do_run_server_live

@@ -6,4 +6,4 @@ if ! command -v 'entr' > /dev/null; then
     exit 1
 fi
 
-find server/assets/ | entr -r ./_do_run_server $@
+find assets/ | entr -r ./_do_run_server $@

assets/pages/not_found.tmpl

@@ -0,0 +1,7 @@
+{{ define "content" }}
+<div class="padded mono">
+    <div class="text-right">
+        page not found
+    </div>
+</div>
+{{ end }}

server/ctrladmin/ctrl.go

@@ -134,13 +134,13 @@ func (c *Controller) H(h adminHandler) http.Handler {
 		if resp.data == nil {
 			resp.data = &templateData{}
 		}
-		session := r.Context().Value(key.Session).(*sessions.Session)
+		if session, ok := r.Context().Value(key.Session).(*sessions.Session); ok {
-		resp.data.Flashes = session.Flashes()
+			resp.data.Flashes = session.Flashes()
-		if err := session.Save(r, w); err != nil {
+			sessLogSave(w, r, session)
-			http.Error(w, fmt.Sprintf("saving session: %v", err), 500)
+		}
-			return
+		if user, ok := r.Context().Value(key.User).(*model.User); ok {
+			resp.data.User = user
 		}
-		resp.data.User, _ = r.Context().Value(key.User).(*model.User)
 		buff := c.buffPool.Get()
 		defer c.buffPool.Put(buff)
 		tmpl, ok := c.templates[resp.template]

server/ctrladmin/handlers.go

@@ -15,6 +15,10 @@ import (
 	"senan.xyz/g/gonic/server/lastfm"
 )
 
+func (c *Controller) ServeNotFound(w http.ResponseWriter, r *http.Request) *Response {
+	return &Response{template: "not_found.tmpl"}
+}
+
 func (c *Controller) ServeLogin(w http.ResponseWriter, r *http.Request) *Response {
 	return &Response{template: "login.tmpl"}
 }

server/server.go

@@ -63,6 +63,7 @@ func (s *Server) SetupAdmin() error {
 	// begin public routes (creates session)
 	routPublic := s.router.PathPrefix("/admin").Subrouter()
 	routPublic.Use(ctrl.WithSession)
+	routPublic.NotFoundHandler = ctrl.H(ctrl.ServeNotFound)
 	routPublic.Handle("/login", ctrl.H(ctrl.ServeLogin))
 	routPublic.Handle("/login_do", ctrl.H(ctrl.ServeLoginDo))
 	assets.PrefixDo("static", func(path string, asset *assets.EmbeddedAsset) {