Is there any way to view the file checksum from the drupal UI?

[Natkeeran]

Is there any way to view the file checksum from the drupal UI?

[mjordan]

Checksums managed by Riprap or by Drupal?

[Natkeeran]

Drupal. We have filehash enabled, thus I assume it calculates it. However, not sure where that info is stored.

If we have another way to display this info, that should be sufficient too.

[mjordan]

Don't know off top of my head but if the filehash module doesn't provide a way, you could write a field plugin for the Media view like the one I have for Islandora Riprap (https://github.com/mjordan/islandora_riprap/blob/master/src/Plugin/views/field/RiprapResults.php) to grab the checksum and render it. Replying on my phone now but can provide more info tomorrow if you want.

[dannylamb]

IIRC it stores checksums in a separate table, but then stuffs them into the file entity early on so that it's available there (and not coming from a bookeeper or 'manager' service that you have to inject in). I think it also makes it available through views, so you could alter the main File view (admin/content/file) to include the hash in the results. Or just make a custom one.

And this is pure speculation on my part, but if you wanted it in the UI on Media display, maybe a pseudo field?

[Natkeeran]

@dannylamb
http://localhost:8000/admin/content/files, yes able to add the checksum.

Is there a way to provide checksum and check it when a file gets uploaded via UI? Not an urgent issue. I remember that if a file or media gets created via REST, it will check the checksum.

[dannylamb]

The filehash module implements the file_validate hook to check the checksum of an uploaded file against existing checksums to dedupe: https://git.drupalcode.org/project/filehash/blob/8.x-1.x/filehash.module#L92 I imagine you could alter the form widget (or make another widget altogether) that has a text field where you can put a checksum. Then implement the file_validate hook and check for mismatch.

[mjordan]

Also relevant is #867.

[dannylamb]

Also, just realized that there's a field formatter for files included in the filehash module that can be used to render file fields as checksums. So we can display it on the Media as well, np.

[Natkeeran]

@mjordan @dannylamb
Closing this ticket as 867 address this issue.