Initial

backend/internal/csrf/handler.go

@@ -0,0 +1,21 @@
+package csrf
+
+import (
+	"net/http"
+)
+
+func UpdateCsrf(w http.ResponseWriter, cookieName string, secure bool) (string, error) {
+	cookieValue, err := generateToken(CsrfLength)
+	if err != nil {
+		return "", err
+	}
+	http.SetCookie(w, &http.Cookie{
+		Name:     cookieName,
+		Value:    cookieValue,
+		Path:     "/",
+		HttpOnly: false,
+		Secure:   secure,
+		SameSite: http.SameSiteLaxMode,
+	})
+	return cookieValue, nil
+}