[jira] [Created] (JAMES-2132) Refactor and match spec for MDN

["Tellier Benoit (JIRA)" <se...@james.apache.org>]

Tellier Benoit created JAMES-2132:
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             Summary: Refactor and match spec for MDN
                 Key: JAMES-2132
                 URL: https://issues.apache.org/jira/browse/JAMES-2132
             Project: James Server
          Issue Type: Improvement
          Components: mdn
    Affects Versions: master
            Reporter: Tellier Benoit
             Fix For: master


Code already exist for Message Delivery Notification. This code is specific to JSieve and is a bit "outdated".

We should:

 - Extract it in a separate library. For now, we can simply do a submodule in **james-project**. Rationals: MDN is something useful and a separate library for using them adds some value.
 - We need to unit test it.
 - We need to refactor current code. We need to make the API immutable, and we have to rely on builders.
 - We need to match the specification: the builder should not allow building an invalid RFC-8098 MDN.

Here is an overview of what needs to be done to be https://tools.ietf.org/html/rfc8098 compliant :

 - Typo Recepients -> Recipients
 - Most fields are optional
 - Most field values is compulsory
 - Additional Disposition types
 - Arbitrary Disposition modifiers
 - Missing MDN-Gateway field
 - Missing Errors fields
 - Missing user defined fields
 - Text can be multiline
 - Address types needs to be flexible

I will also add minimal JavaDoc pointing to specific parts of the spec.



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