[Feature]: Allow chunked uploads for large files (⚠️ Mod comment: Better do not do this!)

Problem / Motivation

Currently, there is a hardcoded limit of 500 MB per file when uploading to webdav in Bulwarkmail.

Proposed Solution

Chunked uploads can be performed for larger files, for example, using Blob.slice().

Alternatives Considered

No response

Feature Area

None

Mockups / Examples

No response

Additional Context

No response

[rathlinus]

it will use the stalwart set max value in the next version

[chrilep]

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⚠️ WARNING! ⚠️WARNING! ⚠️WARNING! ⚠️WARNING! ⚠️WARNING! ⚠️WARNING! ⚠️WARNING! ⚠️WARNING! ⚠️

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The file feature of Stalwart kann kill the server! This is not Bulwark's fault but Stalwart's. Or more precise: RocksDB data persistence after deletes. See below.

I recommend to not use this feature in a productive environment. A user with a 1 GB mailbox can kill the server with this!

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I just verified this issue and found a bad side effect.

1. Started uploads which caused Stalwart to crash with out-of-memory errors (no Bulwark, no reverse proxy issue)
2. I had to increase my server's container to 8 GB RAM for uploading a 2GB file, ok...
3. I did some uploads with various files and found decided to have 8 GB RAM and max upload size at 2 GB as the sweet spot.
4. Then Stalwart died. ☠️
5. PVE tells me 100% disk usage, researching... Stalwart data storage, files are thrown into blob-storage
6. trying to purge the store via api endpoints did not work (tried as admin, as the user, tried all storages and even purged the account)
7. OMFG: Deleting the file from the account does not lead to the file being removed from RocksDB (/var/data/stalwart/data) blob-store!
8. My server stopped working because after many upload tests the hard disk was at 100%!

Fix: Add more disk, clean up apt cache, journal, logs, wait for Stalwart to heal itself.

I hope that the overnight purge run to be seen in the web ui will release the occupied space...

[chrilep]

Nightly maintenance run did not clean up anything. re-opening and pinning this to make users aware.

@rathlinus added a warning to the files section of the app.