Add Edit > Show ID with QR (fixes #243)

cmd/syncthing/gui.go

@@ -19,6 +19,7 @@ import (
 	"github.com/calmh/syncthing/logger"
 	"github.com/calmh/syncthing/model"
 	"github.com/codegangsta/martini"
+	"github.com/vitrun/qart/qr"
 )
 
 type guiError struct {
@@ -80,6 +81,7 @@ func startGUI(cfg config.GUIConfiguration, m *model.Model) error {
 	router.Get("/rest/system", restGetSystem)
 	router.Get("/rest/errors", restGetErrors)
 	router.Get("/rest/discovery", restGetDiscovery)
+	router.Get("/qr/:text", getQR)
 
 	router.Post("/rest/config", restPostConfig)
 	router.Post("/rest/restart", restPostRestart)
@@ -289,6 +291,17 @@ func restGetDiscovery(w http.ResponseWriter) {
 	json.NewEncoder(w).Encode(discoverer.All())
 }
 
+func getQR(w http.ResponseWriter, params martini.Params) {
+	code, err := qr.Encode(params["text"], qr.M)
+	if err != nil {
+		http.Error(w, "Invalid", 500)
+		return
+	}
+
+	w.Header().Set("Content-Type", "image/png")
+	w.Write(code.PNG())
+}
+
 func basic(username string, passhash string) http.HandlerFunc {
 	return func(res http.ResponseWriter, req *http.Request) {
 		error := func() {