sidhantmourya commented on issue #3704:
URL:
https://github.com/apache/logging-log4j2/issues/3704#issuecomment-3084605338
Hi @ppkarwasz,
After reading through the documentation, I've updated the header handling to
properly encode and fold values per RFC 5322 requirements. The current
implementation uses MimeUtility to ensure ASCII-only content with proper line
length limits.
```
for (Property header : headers)
{
String value = MimeUtility.fold(78,
MimeUtility.encodeText(substitutor.replace(header.getValue())));
setHeader.invoke(message, header.getName(), value);
}
```
I'm now looking at how to implement PatternLayout support for headers
similar to how SubjectSerializer works.
```
PatternLayout.java
final Serializer subjectSerializer = PatternLayout.newSerializerBuilder()
.setConfiguration(getConfiguration())
.setPattern(subject)
.build();
```
The issue is that while there's only one subject per email, there can be
multiple headers each with their own potential patterns.
Looking at the SMTPAppender test case in , I see subjects can contain
patterns like "%X{key}", but I'm unsure how to properly extend this to multiple
headers.
```
@Test
void testDelivery() {
final String subjectKey = getClass().getName();
final String subjectValue = "SubjectValue1";
ThreadContext.put(subjectKey, subjectValue);
final int smtpPort = AvailablePortFinder.getNextAvailable();
final SmtpAppender appender = SmtpAppender.newBuilder()
.setName("Test")
.setTo("t...@example.com")
.setCc("c...@example.com")
.setBcc("b...@example.com")
.setFrom("f...@example.com")
.setReplyTo("repl...@example.com")
.setSubject("Subject Pattern %X{" + subjectKey + "}
%maxLen{%m}{10}")
.setSmtpHost(HOST)
.setSmtpPort(smtpPort)
.setBufferSize(3)
.build();
assertNotNull(appender);
assertInstanceOf(SmtpManager.class, appender.getManager());
appender.start();
...
}
```
I went through the documentation and found this
https://logging.apache.org/log4j/2.x/manual/pattern-layout.html#plugin-attr-header.
Are there any existing examples in the codebase of similar multi-pattern
handling that I could follow?
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