broken Sync with IOS App PDF Expert

[critzinger]

Hello everybody,

We have been using the IOS App PDF Expert for a long time to synchronize with our Nextcloud.
Up to version 11.0.3 there were no problems.

After an update to version 12.0.0 we now have the following problem.

Pdf files are recognized as folders and can not be opened.

Up to version 11.0.3 it worked without problems.

There were some changes in version 12.0.0 in the webdav server side

Do you have any solution for me?

Steps to reproduce

1. Sync PDF Files with IOS App PDF Expert
2. in PDF Expert PDF Files recognized as folder
3. open pdf files over webdav sync with PDF Expert fails

Expected behaviour

1. Sync PDF Files with IOS App PDF Expert
2. in PDF Expert PDF Files recognized as PDF Documents
3. open pdf files over webdav sync with PDF Expert success

Actual behaviour

1. Sync PDF Files with IOS App PDF Expert
2. in PDF Expert PDF Files recognized as folder
3. open pdf files over webdav sync with PDF Expert fails

Server configuration

Operating system: Debian 8

Web server: apache 2.4

Database: mysql

PHP version: 7

Nextcloud version: 12.0.0

Updated from an older Nextcloud/ownCloud or fresh install: update from 11.0.3

Where did you install Nextcloud from: https://download.nextcloud.com/server/releases/

Signing status

No errors have been found.

App list

Enabled:

• activity: 2.5.2
• bruteforcesettings: 1.0.2
• comments: 1.2.0
• dav: 1.3.0
• federatedfilesharing: 1.2.0
• files: 1.7.2
• files_pdfviewer: 1.1.1
• files_sharing: 1.4.0
• files_trashbin: 1.2.0
• logreader: 2.0.0
• lookup_server_connector: 1.0.0
• nextant: 1.0.8
• nextcloud_announcements: 1.1
• notifications: 2.0.0
• oauth2: 1.0.5
• password_policy: 1.2.2
• provisioning_api: 1.2.0
• serverinfo: 1.2.0
• sharebymail: 1.2.0
• survey_client: 1.0.0
• systemtags: 1.2.0
• theming: 1.3.0
• twofactor_backupcodes: 1.1.1
• updatenotification: 1.2.0
• workflowengine: 1.2.0

Nextcloud configuration:

Config report

{
"system": {
"passwordsalt": "REMOVED SENSITIVE VALUE",
"secret": "REMOVED SENSITIVE VALUE",
"trusted_domains": [
"xxx.de"
],
"datadirectory": "/var/www/html/owncloud/data",
"dbtype": "mysql",
"version": "12.0.0.29",
"dbname": "owncloud",
"dbhost": "localhost",
"dbtableprefix": "oc_",
"dbuser": "REMOVED SENSITIVE VALUE",
"dbpassword": "REMOVED SENSITIVE VALUE",
"installed": true,
"default_language": "de",
"activity_expire_days": 30,
"appcodechecker": false,
"appstore.experimental.enabled": true,
"appstoreenabled": true,
"appstoreurl": "https://api.owncloud.com/v1",
"assetdirectory": "/var/www/html/owncloud",
"asset-pipeline.enabled": true,
"check_for_working_htaccess": true,
"check_for_working_webdav": true,
"filesystem_check_changes": 1,
"forcessl": true,
"loglevel": 2,
"logdateformat": "F d, Y H:i:s",
"logtimezone": "Europe/Berlin",
"log_query": false,
"cron_log": true,
"maintenance": false,
"memcache.local": "\OC\Memcache\APCu",
"memcache.distributed": "\OC\Memcache\Redis",
"memcache.locking": "\OC\Memcache\Redis",
"redis": {
"host": "localhost",
"port": 6379
},
"theme": "",
"trashbin_retention_obligation": "auto, 30",
"updatechecker": true,
"updater.server.url": "https://updates.nextcloud.com/updater_server/",
"updater.release.channel": "stable",
"versions_retention_obligation": "auto, 30",
"htaccess.RewriteBase": "/owncloud",
"skeletondirectory": "",
"ldapIgnoreNamingRules": false,
"ldapProviderFactory": "\OCA\User_LDAP\LDAPProviderFactory"
}

Are you using external storage, if yes which one: no

Are you using encryption: no

Are you using an external user-backend, if yes which one: no

Client configuration

Browser: PDF Expert

Operating system: IOS 10.3

Logs

Web server error log

Web server error log

No errors have been found.

Nextcloud log (data/nextcloud.log)

Nextcloud log

No errors have been found.

Browser log

Browser log

No errors have been found.

one false example (PDF files recognized as Folders):

one right example (PDF files recognized as PDF files):

[critzinger]

Is it possible that the following article describes the same problem?

#5088

[critzinger]

Hello everbody,

now i have answer from app developer:

Thank you for your patience while the case investigation. Our QA team checked the case and stated that the issue relates to your specific server. Our app displays the file as folder as this information is sent from server.
At this moment, there is not much we can improve on our end. I would recommend that you contact your network administrator with the inquiry to improve the server behavior.

does anyone can help me how i can find out what is the problem with webdav in nc12?

[critzinger]

the fix for the Problem is: owncloud/core#28341

[TravelTrader]

Morning from Germany. I have this same issue. I'm working with PDF Expert iOS-App and I edit and mark PDFs without any problems while they're on iCloud but I cannot edit PDFs on my Nextcloud. Not by connection to webDAV, not through FTP-connection.

the fix for the Problem is: owncloud/core#28341

Here the file Server.php is mentioned I do not find in /lib/composer/sabre/dav/lib/DAV/Server.php. Can anyone help me to edit and mark my PDFs on my Nextcloud? Would be great!

EDIT: With FTP I got it but I have to open every file within the Browser-Nextcloud-System and then the synch of the macOS-integration starts and I can watch the changed file in macOS and iOS. Very strange and not useful for everyday work.

EDIT: After this problems happened now I do not have any access with my iOS-Apps. I didn't change any settings or config.php-lines ... what happened? What changed?

SOLUTION: Deleting all entries in bruteforce_attempts made iOS-/macOS-Client work again. But for PDF Expert I don't have a solution ...