[jira] [Closed] (JAMES-4172) JMAP blob download for message/rfc822 parts returns truncated content due to Content-Length mismatch

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

     [ https://issues.apache.org/jira/browse/JAMES-4172?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Benoit Tellier closed JAMES-4172.
---------------------------------
    Resolution: Fixed

I merged the related PR

Thanks for the contribution and the fix.

> JMAP blob download for message/rfc822 parts returns truncated content due to Content-Length mismatch
> ----------------------------------------------------------------------------------------------------
>
>                 Key: JAMES-4172
>                 URL: https://issues.apache.org/jira/browse/JAMES-4172
>             Project: James Server
>          Issue Type: Improvement
>          Components: Blob, jpa
>    Affects Versions: 3.9.0
>            Reporter: omerfarukicen
>            Priority: Critical
>             Fix For: 3.9.0
>
>          Time Spent: 1h 10m
>  Remaining Estimate: 0h
>
> In \{{EmailBodyPartBlob}} (DownloadRoutes.scala), the \{{size}} and \{{content}} 
> methods use different calculation paths for non-SingleBody parts 
> (such as message/rfc822):
> - *size*: Uses \{{SizeUtils.sizeOf(entity)}} which relies on 
>   \{{SingleBody.size()}} — this returns the *decoded* size 
>   (since BasicBodyFactory decodes content-transfer-encoding during parsing)
> - *content*: Uses \{{DefaultMessageWriter.writeBody()}} which *re-encodes* 
>   the content (e.g. base64), producing more bytes than the decoded size
> Steps ReProducce:
> 1. Send an email containing an embedded message/rfc822 part 
>    (e.g. a KEP signed email with AttachedMimeMessage)
> 2. The inner message should contain multiple base64-encoded attachments
> 3. Use Email/parse on the message/rfc822 blob — attachments are listed correctly
> 4. Download the same blob via /download endpoint using curl
> 5. The downloaded .eml file is truncated — missing attachments and 
>    closing MIME boundaries



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