Benoit Tellier created JAMES-4103:
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Summary: Customize MessageParser
Key: JAMES-4103
URL: https://issues.apache.org/jira/browse/JAMES-4103
Project: James Server
Issue Type: Improvement
Components: JMAP, mailbox
Reporter: Benoit Tellier
Assignee: Antoine Duprat
h3. Why?
Mailbox extract a representation of attachments and store them in a separated,
decoded and parsed projection. This mechanism was introduced for "JMAP draft".
However JMAP RFC-8621 did actually expose attachments as part of body structure
(a subset of body structure) making it hard to make it correspond to the
"mailbox attachments", resulting in each attachment download downloading the
all message, parses it, locate the part, then decode it, which is innefficient.
While discussing the topic with Houssem NASRI, I realized the problem is way
easier flipping it around: it's easie to rework mailbox attachements so that it
reuse JMAP attachment parsing and assign it an attachmentId that ids exactly
the blobId that JMAP will later expose as a blobPart.
THough this solution requires:
- mailbox to somehow depend on JMAP
- MessageParser to have access to the messageId and pass the attachmentId to
the Attachment Mapper
- And finally to attempt mailbox attachment download and fallback if relevant
to message part download.
It's hacky and might result in bigger code changes if implemented in James,
which is overkill for an experiment.
That's why I would like to be able to do such changes in Twake mail, experiment
it and validate it before proposing it to the wider community.
h3. How?
Turn Message Parser as an interface. Then I can provide my own.
Create a AttachmentIDAssignationPolicy in AttachmentMapper. That way we can
override attachmentId assignation policy,
And finally make it easier to override Blob resolvers.
THis results in minimal code changes on James side and unlocks the possibility
to experiment this in Twake mail side.
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