[Bug]: can't upload same name file in directory share as fileexists.html is unauthorized

[ThibaultNocchi]

⚠️ This issue respects the following points: ⚠️

• This is a bug, not a question or a configuration/webserver/proxy issue.
• This issue is not already reported on Github OR Nextcloud Community Forum (I've searched it).
• Nextcloud Server is up to date. See Maintenance and Release Schedule for supported versions.
• I agree to follow Nextcloud's Code of Conduct.

Bug description

When using a publicly shared directory, if a user tries to upload a file with the same name as another one in the directory, he gets an error promp Error loading file exists template.

It seems that the popup that's normally used when logged in can't be fetched as I get a 401 fetching it: /apps/files/templates/fileexists.html

I don't know much of how it works, but maybe that file could be beside a public endpoint?

To note, when using a share in filedrop mode (create only), the file is automatically renamed.

Thank you!

Steps to reproduce

1. Create directory
2. Create public share link with read and create
3. Reach that link, upload a file once
4. Try to upload that file a second time, see the error prompt and the 401 error in the network console

Expected behavior

Either we should get the prompt, or better yet, if only create and read are allowed the file should be auto-renamed.

Installation method

Community Docker image

Nextcloud Server version

29

Operating system

None

PHP engine version

PHP 8.2

Web server

Apache (supported)

Database engine version

MariaDB

Is this bug present after an update or on a fresh install?

None

Are you using the Nextcloud Server Encryption module?

None

What user-backends are you using?

• Default user-backend (database)
• LDAP/ Active Directory
• SSO - SAML
• Other

Configuration report

{
    "system": {
        "loglevel": 0,
        "logfile": "",
        "htaccess.RewriteBase": "\/",
        "memcache.local": "\\OC\\Memcache\\APCu",
        "apps_paths": [
            {
                "path": "\/var\/www\/html\/apps",
                "url": "\/apps",
                "writable": false
            },
            {
                "path": "\/var\/www\/html\/custom_apps",
                "url": "\/custom_apps",
                "writable": true
            }
        ],
        "trusted_proxies": "***REMOVED SENSITIVE VALUE***",
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": [
            "localhost",
            "MYDOMAIN"
        ],
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "dbtype": "mysql",
        "version": "29.0.4.1",
        "overwrite.cli.url": "http:\/\/localhost",
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "installed": true,
        "instanceid": "***REMOVED SENSITIVE VALUE***",
        "ldapProviderFactory": "OCA\\User_LDAP\\LDAPProviderFactory",
        "mail_from_address": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpmode": "smtp",
        "mail_sendmailmode": "smtp",
        "mail_domain": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpauth": 1,
        "mail_smtpsecure": "ssl",
        "mail_smtpauthtype": "LOGIN",
        "mail_smtphost": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpport": "465",
        "mail_smtpname": "***REMOVED SENSITIVE VALUE***",
        "mail_smtppassword": "***REMOVED SENSITIVE VALUE***",
        "app_install_overwrite": [
            "breezedark"
        ],
        "maintenance": false,
        "maintenance_window_start": 1,
        "default_phone_region": "FR",
        "mysql.utf8mb4": true,
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "upgrade.disable-web": true
    }
}

List of activated Apps

Enabled:
  - cloud_federation_api: 1.12.0
  - comments: 1.19.0
  - contactsinteraction: 1.10.0
  - dav: 1.30.1
  - duplicatefinder: 1.2.5
  - federatedfilesharing: 1.19.0
  - files: 2.1.0
  - files_downloadlimit: 2.0.0
  - files_external: 1.21.0
  - files_pdfviewer: 2.10.0
  - files_reminders: 1.2.0
  - files_sharing: 1.21.0
  - files_trashbin: 1.19.0
  - files_versions: 1.22.0
  - firstrunwizard: 2.18.0
  - logreader: 2.14.0
  - lookup_server_connector: 1.17.0
  - notifications: 2.17.0
  - oauth2: 1.17.0
  - password_policy: 1.19.0
  - privacy: 1.13.0
  - provisioning_api: 1.19.0
  - recommendations: 2.1.0
  - related_resources: 1.4.0
  - serverinfo: 1.19.0
  - settings: 1.12.0
  - sharebymail: 1.19.0
  - support: 1.12.0
  - systemtags: 1.19.0
  - text: 3.10.1
  - theming: 2.4.0
  - twofactor_backupcodes: 1.18.0
  - unroundedcorners: 1.1.3
  - updatenotification: 1.19.1
  - user_ldap: 1.20.0
  - viewer: 2.3.0
  - workflowengine: 2.11.0
Disabled:
  - activity: 2.21.1 (installed 2.17.0)
  - admin_audit: 1.19.0
  - bruteforcesettings: 2.9.0
  - circles: 29.0.0-dev (installed 27.0.1)
  - dashboard: 7.9.0 (installed 7.5.0)
  - encryption: 2.17.0
  - federation: 1.19.0 (installed 1.15.0)
  - files_rightclick: 0.15.1 (installed 1.6.0)
  - nextcloud_announcements: 1.18.0 (installed 1.14.0)
  - photos: 2.5.0 (installed 2.0.1)
  - survey_client: 1.17.0 (installed 1.13.0)
  - suspicious_login: 7.0.0
  - twofactor_totp: 11.0.0-dev
  - user_status: 1.9.0 (installed 1.5.0)
  - weather_status: 1.9.0 (installed 1.5.0)

Nextcloud Signing status

No errors have been found.

Nextcloud Logs

No response

Additional info

No response

[susnux]

Duplicate of #46848