From f0f072c4a698236af3e76ec34436175e208ff3d1 Mon Sep 17 00:00:00 2001
From: Lan Tian <xuyh0120@outlook.com>
Date: Sun, 30 Jun 2024 13:04:15 -0700
Subject: [PATCH] frontend: handle UTF-8 characters in GraphViz graphs

---
 frontend/assets/templates/bgpmap.tpl | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/frontend/assets/templates/bgpmap.tpl b/frontend/assets/templates/bgpmap.tpl
index 8872a60..069a65d 100644
--- a/frontend/assets/templates/bgpmap.tpl
+++ b/frontend/assets/templates/bgpmap.tpl
@@ -5,8 +5,19 @@
 <script src="/static/jsdelivr/npm/viz.js@2.1.2/viz.min.js" crossorigin="anonymous"></script>
 <script src="/static/jsdelivr/npm/viz.js@2.1.2/lite.render.js" crossorigin="anonymous"></script>
 <script>
+  function decodeBase64(base64) {
+    const text = atob(base64);
+    const length = text.length;
+    const bytes = new Uint8Array(length);
+    for (let i = 0; i < length; i++) {
+        bytes[i] = text.charCodeAt(i);
+    }
+    const decoder = new TextDecoder();
+    return decoder.decode(bytes);
+  }
+
   var viz = new Viz();
-  viz.renderSVGElement(atob({{ .Result }}))
+  viz.renderSVGElement(decodeBase64({{ .Result }}))
   .then(element => {
     document.getElementById("bgpmap").appendChild(element);
   })