Cannot save WOPI allow list when wopi_allowlist setting needs creating

[artfulrobot]

Describe the bug

Entering an IP address in the allow list box and clicking the → button causes the box to get blanked; the IP is not saved.

To Reproduce
Steps to reproduce the behavior:

1. Go to /index.php/settings/admin/richdocuments
2. Enter an IP address
3. Click →
4. pause while it loads then box goes blank.

Expected behavior
Save the IP

Screenshots
Screencast from 2024-02-01 08-19-47.webm

Client details:

• OS: Fedora 39
• Browser Firefox
• Version 123.0b4
• Device: desktop

Server details

Operating system: Debian

Web server: nginx

Database: MariaDB

PHP version: 8.1

Nextcloud version: 28.0.1

Version of the richdocuments app 8.3.1

Version of Collabora Online 23.5.705

Configuration of the richdocuments app

{                                                                                                                                                     
    "apps": {                                                                                                                                         
        "richdocuments": {                                                                                                                            
            "canonical_webroot": "",                                                                                                                  
            "disable_certificate_verification": "yes",                                                                                                
            "enabled": "yes",                                                                                                                         
            "installed_version": "8.3.1",                                                                                                             
            "public_wopi_url": "https:\/\/xxxx.uk",                                                                                       
            "types": "prevent_group_restriction",                                                                                                     
            "wopi_url": "https:\/\/xxxx.uk\/apps\/richdocumentscode\/proxy.php?req="                                                      
        }                                                                                                                                             
    }                                                                                                                                                 
} 

Browser log

It seems the problem is that the browser is sending null to https://safe.artfulrobot.uk/index.php/apps/richdocuments/ajax/admin.php

Body of the POST request:

{"wopi_allowlist":null}

[artfulrobot]

The fix seems to be to set it from the command line, after that the UI works:

./occ  config:app:set richdocuments wopi_allowlist --value  '127.0.0.1' 

After doing this - which created the config value ,the UI shows 127... and also lets me update and save that value ok.

(If I was to guess it would be something javascripty around binding of things that don't exist.)

[Routhinator]

Confirming the bug with the latest helm chart and Nextcloud 28.0.1 and 28.0.2, and Nextcloud Office 8.3.1

Also confirming the workaround, and adding a quick one liner for those running with the helm chart:

kubectl -n nextcloud exec -it service/nextcloud -c nextcloud -- su -s /bin/sh www-data -c "php occ config:app:set richdocuments wopi_allowlist --value  '127.0.0.1,10.0.0.0/8'"
Config value wopi_allowlist for app richdocuments set to 127.0.0.1,10.0.0.0/8

[joshtrichards]

Duplicate of #3377