spetz commented on code in PR #2656:
URL: https://github.com/apache/iggy/pull/2656#discussion_r2753616097


##########
core/server/src/http/jwt/jwt_manager.rs:
##########
@@ -232,15 +248,63 @@ impl JwtManager {
             .error(|e: &IggyError| {
                 format!("{COMPONENT} (error: {e}) - failed to save revoked 
access token: {id}")
             })?;
-        self.generate(jwt_claims.claims.sub)
+        let user_id = jwt_claims
+            .claims
+            .sub
+            .parse::<u32>()
+            .map_err(|_| IggyError::InvalidAccessToken)?;
+        self.generate(user_id)
     }
 
-    pub fn decode(
+    pub async fn decode(
         &self,
         token: &str,
         algorithm: Algorithm,
     ) -> Result<TokenData<JwtClaims>, IggyError> {
         let validation = self.validations.get(&algorithm);
+        let kid = jsonwebtoken::decode_header(token).ok().and_then(|h| h.kid);
+
+        #[allow(clippy::collapsible_if)]
+        if let Ok(insecure) = 
jsonwebtoken::dangerous::insecure_decode::<JwtClaims>(token) {
+            debug!(
+                "JWT decoded insecurely, issuer: {}, kid: {:?}",
+                insecure.claims.iss, kid
+            );
+            if let Some(config) = 
self.trusted_issuer.get(&insecure.claims.iss) {
+                debug!("Found trusted issuer config: {}", config.issuer);
+                if let Some(kid_str) = kid.as_deref() {
+                    if let Some(decoding_key) = self

Review Comment:
   Please try to avoid multiple levels of if statements, better to return/break 
quickly whenever possible with `let Some()` or `let Ok()` patterns.



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