start using gorilla csrf - in place but not used

main.go

@@ -6,6 +6,7 @@ import (
 	"flag"
 	"fmt"
 	"github.com/gorilla/sessions"
+	"github.com/gorilla/csrf"
 	_ "github.com/lib/pq"
 	"net/http"
 	"os"
@@ -44,6 +45,7 @@ func loadConfig(env string) {
 		fmt.Println("Error: cannot open config file: config/" + env + ".json")
 		os.Exit(-1)
 	}
+	defer file.Close();
 	decoder := json.NewDecoder(file)
 	err = decoder.Decode(&config)
 	if err != nil {
@@ -67,6 +69,21 @@ func dbConnect() {
 	}
 }
 
+func csrfSecret() string {
+	file, err := os.Open("csrf-secret.txt")
+	if err != nil {
+		fmt.Println("Error: cannot open csrf-secret.txt (run gen-csrf.sh to generate)")
+		os.Exit(-1)
+	}
+	defer file.Close();
+	var bytes []byte = make([]byte, 32)
+	n, err := file.Read(bytes)
+	if err != nil || n != 32 {
+		fmt.Println("Error: cannot open csrf-secret.txt (run gen-csrf.sh to generate)")
+	}
+	return string(bytes)
+}
+
 func main() {
 	fmt.Println("transmet ", VERSION)
 
@@ -78,10 +95,10 @@ func main() {
 	loadConfig(*envFlag)
 	dbConnect()
 	initTemplates()
-	init_route_handlers()
+	r := init_route_handlers()
 
 	fmt.Println("Listening on", config.Port, "...")
-	err := http.ListenAndServe(":"+config.Port, nil)
+	err := http.ListenAndServe(":"+config.Port, csrf.Protect([]byte(csrfSecret()))(r))
 	if err != nil {
 		fmt.Println("Fatal Error: ", err)
 	}

route_handlers.go

@@ -420,7 +420,7 @@ func ServeFileHandler(res http.ResponseWriter, req *http.Request) {
 	http.ServeFile(res, req, "./"+fname)
 }
 
-func init_route_handlers() {
+func init_route_handlers() *mux.Router {
 	http.Handle("/js/", http.StripPrefix("/js/", http.FileServer(http.Dir("js/"))))
 	http.Handle("/css/", http.StripPrefix("/css/", http.FileServer(http.Dir("css/"))))
 	http.Handle("/fonts/", http.StripPrefix("/fonts", http.FileServer(http.Dir("fonts/"))))
@@ -447,4 +447,6 @@ func init_route_handlers() {
 	r.HandleFunc("/categories/delete", userHandler(categoryDeleteHandler))
 
 	http.Handle("/", r)
+	
+	return r
 }