Bulk upload

[tobiasKaminsky]

• on desktop clients: construct binary blob with multiple files and send it together with filename/path and byte offset
• on the server: split the big file into the individual ones and write them to the filesystem

There is already a PoC by @juliushaertl

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Refs:

• Bulk upload desktop#3657
• https://github.com/nextcloud-gmbh/server/issues/44

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Gist:

• https://gist.github.com/juliushaertl/59da4c8a31ea4a0cc7f73dfe5f15d538

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Tests refs for upload:

• https://github.com/nextcloud/server/blob/master/build/integration/features/webdav-related.feature#L281-L306
• https://github.com/nextcloud/server/blob/master/build/integration/features/bootstrap/WebDav.php#L533

CC: @skjnldsv @AndyScherzinger

[skjnldsv]

close in favour of #28395 ?

[juliusknorr]

No, #28395 is a further improvement that could be done. I just noticed that I haven't migrated my notes and implementation idea here, I'll update the original post later with more details.