Converstation Management API returns empty string instead of xml

[matzexcom]

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After updating from 14.0.4 to 14.0.5 the endpoints from talk don't return XML OCS Results.

Steps to reproduce

1. Install Nextcloud with Talk APP
2. Call "Creating new Conversation" Endpoint (https://nextcloud-talk.readthedocs.io/en/latest/conversation/#creating-a-new-conversation)
3. Return value is an empty string

Expected behaviour

Conversation Management API returns XML OCS Result

Actual behaviour

An empty string is returned after API request

Talk app

Talk app version: 14.0.5

Custom Signaling server configured: no

Custom TURN server configured: no
Custom STUN server configured: no

Browser

not needed

Server configuration

Operating system: Linux 5.4.0-123-generic x86_64

Web server: Apache

Database: MySQL

PHP version: 8.0.23

Nextcloud Version: 24.0.5

List of activated apps:

Details

Enabled:
 - accessibility: 1.10.0
 - activity: 2.16.0
 - admin_audit: 1.14.0
 - circles: 24.0.1
 - cloud_federation_api: 1.7.0
 - comments: 1.14.0
 - contactsinteraction: 1.5.0
 - dashboard: 7.4.0
 - dav: 1.22.0
 - federatedfilesharing: 1.14.0
 - federation: 1.14.0
 - files: 1.19.0
 - files_pdfviewer: 2.5.0
 - files_rightclick: 1.3.0
 - files_sharing: 1.16.2
 - files_trashbin: 1.14.0
 - files_versions: 1.17.0
 - files_videoplayer: 1.13.0
 - firstrunwizard: 2.13.0
 - groupfolders: 12.0.1
 - logreader: 2.9.0
 - lookup_server_connector: 1.12.0
 - nextcloud_announcements: 1.13.0
 - notifications: 2.12.1
 - oauth2: 1.12.0
 - password_policy: 1.14.0
 - photos: 1.6.0
 - privacy: 1.8.0
 - provisioning_api: 1.14.0
 - recommendations: 1.3.0
 - serverinfo: 1.14.0
 - settings: 1.6.0
 - sharebymail: 1.14.0
 - spreed: 14.0.5
 - support: 1.7.0
 - survey_client: 1.12.0
 - systemtags: 1.14.0
 - text: 3.5.1
 - theming: 1.15.0
 - twofactor_backupcodes: 1.13.0
 - updatenotification: 1.14.0
 - user_status: 1.4.0
 - viewer: 1.8.0
 - weather_status: 1.4.0
 - workflowengine: 2.6.0
Disabled:
 - encryption
 - files_external
 - user_ldap

Nextcloud configuration:

Details

{
  "system": {
    "passwordsalt": "***REMOVED SENSITIVE VALUE***",
    "secret": "***REMOVED SENSITIVE VALUE***",
    "trusted_domains": [
      "*"
    ],
    "datadirectory": "***REMOVED SENSITIVE VALUE***",
    "dbtype": "mysql",
    "version": "24.0.5.1",
    "overwrite.cli.url": "http:\/\/nextcloud.p601723.webspaceconfig.de\/",
    "dbname": "***REMOVED SENSITIVE VALUE***",
    "dbhost": "***REMOVED SENSITIVE VALUE***",
    "dbport": "",
    "dbtableprefix": "oc_",
    "mysql.utf8mb4": true,
    "dbuser": "***REMOVED SENSITIVE VALUE***",
    "dbpassword": "***REMOVED SENSITIVE VALUE***",
    "installed": true,
    "instanceid": "***REMOVED SENSITIVE VALUE***",
    "htaccess.RewriteBase": "\/",
    "default_language": "de",
    "default_locale": "de_DE",
    "mail_smtpmode": "sendmail",
    "mail_sendmailmode": "pipe",
    "mail_from_address": "***REMOVED SENSITIVE VALUE***",
    "mail_domain": "***REMOVED SENSITIVE VALUE***",
    "check_for_working_wellknown_setup": false,
    "maintenance": false,
    "loglevel": 2
  }
}

Server log (data/nextcloud.log)

Details

[PHP] Fehler: TypeError: XMLWriter::writeElement(): Argument # 2 ($content) must be of type ?string, stdClass given at /html/nextcloud/lib/private/AppFramework/OCS/BaseResponse.php#148

POST /ocs/v2.php/apps/spreed/api/v4/room
from 95.91.234.152 by p601723 at 2022-10-06T14:10:31+00:00

[nickvergessen]

There should be something in the nextcloud.log file giving us a hint.
Then again, the top of the conversation api documentation page has a warning about incompatibility with XML.

In general the XML source is more like deprecated. if you use ocs/v2.php/ the default layout is JSON and that is also what we test and use in our clients.

Out of curiosity: What of tool/client are you developing?
Would it be possible to use the JSON format?

[matzexcom]

Thanks for the quick reply. I didn't check the server log my bad 🙈

Server Log:

[PHP] Fehler: TypeError: XMLWriter::writeElement(): Argument # 2 ($content) must be of type ?string, stdClass given at /html/nextcloud/lib/private/AppFramework/OCS/BaseResponse.php#148

POST /ocs/v2.php/apps/spreed/api/v4/room
from 95.91.234.152 by p601723 at 2022-10-06T14:10:31+00:00

Details

{"reqId":"4EokD6UTXuIf9BU0ziOU","level":3,"time":"2022-10-06T14:10:31+00:00","remoteAddr":"95.91.234.152","user":"p601723","app":"PHP","method":"POST","url":"/ocs/v2.php/apps/spreed/api/v4/room","message":"TypeError: XMLWriter::writeElement(): Argument #2 ($content) must be of type ?string, stdClass given at /html/nextcloud/lib/private/AppFramework/OCS/BaseResponse.php#148","userAgent":"GuzzleHttp/6.5.5 curl/7.74.0 PHP/7.4.30","version":"24.0.5.1","data":{"app":"PHP"},"id":"633ee1d9ce7b7"}

Thank you a lot for the tip to switch to JSON, I always thought XML was the only return format for the nextcloud. After applying Accept: application/json to the header it works. I know I have to roll back all these XML additions to use JSON, but it will be better when XML is somewhat deprecated.

Out of curiosity: What of tool/client are you developing?

Details

We created a social network for our company on Drupal (PHP) basis with groups and so on and use nextcloud for file management with groupfolders and talk group chats. So we rely on the API endpoint because drupal sends requests to create, update, delete nextcloud groups, talk conversations, etc

[nickvergessen]

Urgh, we had fixed this already. Just forgot to backport:
#7954

[nickvergessen]

Fixed as per above