From 6535eb879c2c5c524179ace8cce719ac6ac76c57 Mon Sep 17 00:00:00 2001
From: JianBo He <heeejianbo@gmail.com>
Date: Wed, 27 Apr 2022 17:27:27 +0800
Subject: [PATCH] fix(authn-jwt): avoid to save empty claim name

An empty claim_name has not a real meaning and will result in a
syntax error cluster_override.conf. i.e:
```
authentication {
  mechanism = "jwt"
  verify_claims { = "22"}
  ...
}
```
---
 apps/emqx_authn/src/simple_authn/emqx_authn_jwt.erl | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/apps/emqx_authn/src/simple_authn/emqx_authn_jwt.erl b/apps/emqx_authn/src/simple_authn/emqx_authn_jwt.erl
index 58c51facb..c82ec3d0a 100644
--- a/apps/emqx_authn/src/simple_authn/emqx_authn_jwt.erl
+++ b/apps/emqx_authn/src/simple_authn/emqx_authn_jwt.erl
@@ -441,6 +441,11 @@ check_claim_name(iat) ->
     false;
 check_claim_name(nbf) ->
     false;
+check_claim_name(Name) when
+    Name == <<>>;
+    Name == ""
+->
+    false;
 check_claim_name(_) ->
     true.