Download all attachments of an email

[jancborchardt]

When there are more attachments, we have a button for »Save all to Files«. What would be awesome is another button for »Download all«.

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[ChristophWurst]

We should use zip archives as they are supported well on most platforms.

[jancborchardt]

Yep, this is also what we do for the Files app.

[jakobsack]

The files app uses the private API (OC_FILES => \OC\Streamer).
Implementing the zip feature seems to be straight forward but we'd have to implement a streamer class/interface in the OCP namespace first.