From 8a80094cc28081486413eb0d9dce39dda52a0ba2 Mon Sep 17 00:00:00 2001
From: Moonjunhyeon <84641360+moon-jun@users.noreply.github.com>
Date: Thu, 10 Apr 2025 16:43:00 +0900
Subject: [PATCH] Update oic_session.rb

fix: JWT Token Json Parsing Error At using Korean, Turkish...else
purpose
1. JWT use Base 64 URL encoding
So, Before Base 64 Decoding
URL-safe character(-, _) should change to (+, /)
 2. Including korean JWT payload is Json string That encoding by UTF-8
So,  ByteArray Decoded by Base64 should change to UTF-8 String
3. Finally payload is Json So, Parsing And return To JS Object
---
 app/models/oic_session.rb | 27 ++++++++++++++++++++++-----
 1 file changed, 22 insertions(+), 5 deletions(-)

diff --git a/app/models/oic_session.rb b/app/models/oic_session.rb
index dba5071..9c36e9e 100644
--- a/app/models/oic_session.rb
+++ b/app/models/oic_session.rb
@@ -157,7 +157,16 @@ def authorized?
 
     return false
   end
-
+  
+ def decode_jwt_payload(payload_encoded)
+    # Add missing padding (JWT may omit padding)
+    remainder = payload_encoded.length % 4
+    if remainder > 0
+      payload_encoded += "=" * (4 - remainder)
+    end
+    Base64.urlsafe_decode64(payload_encoded).force_encoding("UTF-8")
+  end
+  
   def admin?
     if client_config['admin_group'].present?
       if user["member_of"].present?
@@ -174,11 +183,19 @@ def admin?
   end
 
   def user
-    if access_token? # keycloak way...
-      @user = JSON::parse(Base64::decode64(access_token.split('.')[1]))
-    else
-      @user = JSON::parse(Base64::decode64(id_token.split('.')[1]))
+    begin
+      payload_encoded = if access_token?
+                          access_token.split('.')[1]
+                        else
+                          id_token.split('.')[1]
+                        end
+      decoded_payload = Base64.decode64(payload_encoded).force_encoding("UTF-8")
+
+      @user = JSON.parse(decoded_payload)
+    rescue JSON::ParserError => e
+      raise e 
     end
+
     return @user
   end