Add proxy auth ui

proxy/internal/auth/middleware.go

@@ -3,9 +3,7 @@ package auth
 import (
 	"context"
 	"crypto/rand"
-	_ "embed"
 	"encoding/base64"
-	"html/template"
 	"net"
 	"net/http"
 	"sync"
@@ -13,12 +11,10 @@ import (
 
 	"google.golang.org/grpc"
 
+	"github.com/netbirdio/netbird/proxy/web"
 	"github.com/netbirdio/netbird/shared/management/proto"
 )
 
-//go:embed auth.gohtml
-var authTemplate string
-
 type Method string
 
 var (
@@ -91,7 +87,6 @@ func NewMiddleware() *Middleware {
 // In the event that no authentication schemes are defined for the domain,
 // then the request will also be simply passed through.
 func (mw *Middleware) Protect(next http.Handler) http.Handler {
-	tmpl := template.Must(template.New("auth").Parse(authTemplate))
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		host, _, err := net.SplitHostPort(r.Host)
 		if err != nil {
@@ -141,13 +136,7 @@ func (mw *Middleware) Protect(next http.Handler) http.Handler {
 		// if none of them intercept the request, then this handler will
 		// be called and present the user with the authentication page.
 		handler := http.Handler(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-			if err := tmpl.Execute(w, struct {
-				Methods map[string]string
-			}{
-				Methods: methods,
-			}); err != nil {
-				http.Error(w, err.Error(), http.StatusBadGateway)
-			}
+			web.ServeHTTP(w, r, map[string]any{"methods": methods})
 		}))
 
 		// No authentication succeeded. Apply the scheme handlers.