quantranhong1999 commented on code in PR #3059:
URL: https://github.com/apache/james-project/pull/3059#discussion_r3425555405


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protocols/sasl/src/main/java/org/apache/james/protocols/sasl/JamesSaslAuthenticator.java:
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@@ -0,0 +1,93 @@
+/****************************************************************
+ * Licensed to the Apache Software Foundation (ASF) under one   *
+ * or more contributor license agreements.  See the NOTICE file *
+ * distributed with this work for additional information        *
+ * regarding copyright ownership.  The ASF licenses this file   *
+ * to you under the Apache License, Version 2.0 (the            *
+ * "License"); you may not use this file except in compliance   *
+ * with the License.  You may obtain a copy of the License at   *
+ *                                                              *
+ *   http://www.apache.org/licenses/LICENSE-2.0                 *
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+ * specific language governing permissions and limitations      *
+ * under the License.                                           *
+ ****************************************************************/
+
+package org.apache.james.protocols.sasl;
+
+import java.util.Optional;
+
+import jakarta.inject.Inject;
+
+import org.apache.james.core.Username;
+import org.apache.james.mailbox.Authenticator;
+import org.apache.james.mailbox.Authorizator;
+import org.apache.james.mailbox.exception.MailboxException;
+import org.apache.james.protocols.api.sasl.SaslAuthenticationResult;
+import org.apache.james.protocols.api.sasl.SaslAuthenticator;
+import org.apache.james.protocols.api.sasl.SaslFailure;
+import org.apache.james.protocols.api.sasl.SaslIdentity;
+
+public class JamesSaslAuthenticator implements SaslAuthenticator {
+    private final Authenticator authenticator;
+    private final Authorizator authorizator;
+
+    @Inject
+    public JamesSaslAuthenticator(Authenticator authenticator, Authorizator 
authorizator) {

Review Comment:
   IMO, we should avoid injecting `SessionProvider` directly into SASL 
mechanisms because `SessionProvider` returns `MailboxSession`, which is an 
IMAP/mailbox-specific session object.
   
   For example, if SMTP later reuses OAUTHBEARER, the mechanism should not 
create a `MailboxSession`. SMTP only needs the authenticated/authorized 
identity to update its own SMTP session state and relay/submission policy.
   
   That is why I prefer keeping a small `SaslAuthenticator` wrapper: mechanisms 
perform credential validation and authorization, then return a protocol-neutral 
`SaslAuthenticationResult.Success(SaslIdentity)`. Each protocol remains 
responsible for initializing its own session model from that identity.



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