From ca2fafa21461b2f9def5ab76f7c902a19d2cef42 Mon Sep 17 00:00:00 2001
From: "kihwan.song" <kihwan.song@pitap.at>
Date: Mon, 13 Jul 2026 11:45:26 +0900
Subject: [PATCH] =?UTF-8?q?vpn=20=EC=84=B8=ED=8C=85=20=EC=8A=A4=ED=81=AC?=
 =?UTF-8?q?=EB=A6=BD=ED=8A=B8=20=EC=88=98=EC=A0=95=202?=
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---
 connect-vpn/action.yml | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/connect-vpn/action.yml b/connect-vpn/action.yml
index c61936e..bddf7fa 100644
--- a/connect-vpn/action.yml
+++ b/connect-vpn/action.yml
@@ -26,10 +26,10 @@ inputs:
     description: TOTP 시드 키 (이 값으로 매 실행 OTP 코드를 로컬 생성)
   otp-seed-format:
     required: false
-    default: "base32"
+    default: "base64"
     description: >
-      OTP 시드 포맷. base32=구글OTP류 문자열(대문자/공백은 자동 정규화),
-      hex=16진수 문자열. base32에서 'Base32 invalid' 나면 hex로 시도.
+      OTP 시드 포맷. base32=구글OTP류 문자열(대문자/공백 자동 정규화),
+      hex=16진수 문자열, base64=base64로 인코딩된 키(예 R1F5...== → 디코딩 후 사용).
   otp-mode:
     required: false
     default: "append"
@@ -141,8 +141,16 @@ runs:
           hex)
             OTP=$(oathtool --totp "$SEED")
             ;;
+          base64)
+            # base64 키를 디코딩 → raw 바이트를 hex로 변환 → oathtool에 hex로 전달
+            SEED_HEX=$(printf '%s' "$SEED" | base64 -d 2>/dev/null | od -An -v -tx1 | tr -d ' \n')
+            if [ -z "$SEED_HEX" ]; then
+              echo "base64 디코딩 실패: 시드가 올바른 base64인지 확인"; exit 1
+            fi
+            OTP=$(oathtool --totp "$SEED_HEX")
+            ;;
           *)
-            echo "잘못된 otp-seed-format: $OTP_SEED_FORMAT (base32|hex)"; exit 1
+            echo "잘못된 otp-seed-format: $OTP_SEED_FORMAT (base32|hex|base64)"; exit 1
             ;;
         esac