[james-project] 04/08: JAMES-3431 Mail hook for handling RET & ENVID parameters

[bt...@apache.org]

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commit 737de53c918e578036c5da65944deedde952a9a6
Author: Benoit Tellier <bt...@linagora.com>
AuthorDate: Thu Dec 10 11:05:09 2020 +0700

    JAMES-3431 Mail hook for handling RET & ENVID parameters
---
 .../james/smtpserver/dsn/DSNMailParameterHook.java | 63 ++++++++++++++++++++++
 1 file changed, 63 insertions(+)

diff --git a/server/protocols/protocols-smtp/src/main/java/org/apache/james/smtpserver/dsn/DSNMailParameterHook.java b/server/protocols/protocols-smtp/src/main/java/org/apache/james/smtpserver/dsn/DSNMailParameterHook.java
new file mode 100644
index 0000000..ddac5c5
--- /dev/null
+++ b/server/protocols/protocols-smtp/src/main/java/org/apache/james/smtpserver/dsn/DSNMailParameterHook.java
@@ -0,0 +1,63 @@
+/****************************************************************
+ * 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                 *
+ *                                                              *
+ * Unless required by applicable law or agreed to in writing,   *
+ * software distributed under the License is distributed on an  *
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY       *
+ * KIND, either express or implied.  See the License for the    *
+ * specific language governing permissions and limitations      *
+ * under the License.                                           *
+ ****************************************************************/
+
+package org.apache.james.smtpserver.dsn;
+
+import static org.apache.james.protocols.api.ProtocolSession.State.Transaction;
+import static org.apache.mailet.DsnParameters.ENVID_PARAMETER;
+import static org.apache.mailet.DsnParameters.RET_PARAMETER;
+
+import java.util.Optional;
+
+import org.apache.james.protocols.api.ProtocolSession;
+import org.apache.james.protocols.smtp.SMTPSession;
+import org.apache.james.protocols.smtp.hook.HookResult;
+import org.apache.james.protocols.smtp.hook.MailParametersHook;
+import org.apache.mailet.DsnParameters;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class DSNMailParameterHook implements MailParametersHook {
+    private static final Logger LOGGER = LoggerFactory.getLogger(DSNMailParameterHook.class);
+
+    public static final ProtocolSession.AttachmentKey<DsnParameters.Ret> DSN_RET = ProtocolSession.AttachmentKey.of("DSN_RET", DsnParameters.Ret.class);
+    public static final ProtocolSession.AttachmentKey<DsnParameters.EnvId> DSN_ENVID = ProtocolSession.AttachmentKey.of("DSN_ENVID", DsnParameters.EnvId.class);
+
+    @Override
+    public HookResult doMailParameter(SMTPSession session, String paramName, String paramValue) {
+        if (paramName.equals(RET_PARAMETER)) {
+            DsnParameters.Ret.parse(paramValue)
+                .or(() -> {
+                    LOGGER.debug("Invalid DSN RET value: {}", paramValue);
+                    return Optional.empty();
+                })
+                .ifPresent(ret -> session.setAttachment(DSN_RET, ret, Transaction));
+        }
+        if (paramName.equals(ENVID_PARAMETER)) {
+            DsnParameters.EnvId envId = DsnParameters.EnvId.of(paramValue);
+            session.setAttachment(DSN_ENVID, envId, Transaction);
+        }
+        return HookResult.DECLINED;
+    }
+
+    @Override
+    public String[] getMailParamNames() {
+        return new String[] {RET_PARAMETER, ENVID_PARAMETER};
+    }
+}


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