[OCM][Test Suite] Nextcloud/ownCloud cannot access share from oCIS

[MahdiBaghbani]

Everything between oCIS and Nextcloud works as expected except accessing the share from oCIS.

Trying to click on a share from oCIS to Nextcloud in Nextcloud UI leads to these logs.

oCIS:

2024-08-13T07:46:14Z INF access-log bytes=7947 duration=1.16117 line=github.com/owncloud/ocis/v2/services/proxy/pkg/middleware/accesslog.go:34 method=GET path=/ocm-provider/ proto=HTTP/1.1 remote-addr=172.20.0.4:56918 request-id=49c112facee3/Pog3fMACH0-000612 service=proxy status=200 traceid=de4297bdbd9ed1841a9cc1c4bc06c96b
2024-08-13T07:46:14Z INF access-log bytes=7947 duration=0.92403 line=github.com/owncloud/ocis/v2/services/proxy/pkg/middleware/accesslog.go:34 method=PROPFIND path=/public.php/webdav/ proto=HTTP/1.1 remote-addr=172.20.0.4:56928 request-id=49c112facee3/Pog3fMACH0-000614 service=proxy status=200 traceid=e45d55dede2fd3c05fe88567d92a7011
2024-08-13T07:46:14Z INF access-log bytes=7947 duration=1.02239 line=github.com/owncloud/ocis/v2/services/proxy/pkg/middleware/accesslog.go:34 method=PROPFIND path=/public.php/webdav/ proto=HTTP/1.1 remote-addr=172.20.0.4:56928 request-id=49c112facee3/Pog3fMACH0-000616 service=proxy status=200 traceid=3e2cfd78e04aa57c91aac3b4c3641171
2024-08-13T07:46:15Z INF access-log bytes=7947 duration=1.07183 line=github.com/owncloud/ocis/v2/services/proxy/pkg/middleware/accesslog.go:34 method=GET path=/ocm-provider/ proto=HTTP/1.1 remote-addr=172.20.0.4:56934 request-id=49c112facee3/Pog3fMACH0-000618 service=proxy status=200 traceid=c12a71ed6dc81f5cd795d2bd9fe11948

Nextcloud:

::1 - - [13/Aug/2024:07:46:13 +0000] "OPTIONS * HTTP/1.0" 200 126 "-" "Apache/2.4.59 (Ubuntu) OpenSSL/3.0.2 (internal dummy connection)"
172.20.0.6 - - [13/Aug/2024:07:46:14 +0000] "GET /remote.php/webdav/invite-link-ocis-nc.txt HTTP/1.1" 404 12287 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:128.0) Gecko/20100101 Firefox/128.0"
{"reqId":"wNqepFC11thAb4SizCMp","level":3,"time":"2024-08-13T07:46:14+00:00","remoteAddr":"172.20.0.6","user":"marie","app":"PHP","method":"GET","url":"/remote.php/webdav/invite-link-ocis-nc.txt","message":"Undefined variable $response at /var/www/html/lib/private/Files/Storage/DAV.php#305","userAgent":"Mozilla/5.0 (X11; Linux x86_64; rv:128.0) Gecko/20100101 Firefox/128.0","version":"27.1.10.2","data":{"app":"PHP"}}
{"reqId":"wNqepFC11thAb4SizCMp","level":3,"time":"2024-08-13T07:46:14+00:00","remoteAddr":"172.20.0.6","user":"marie","app":"PHP","method":"GET","url":"/remote.php/webdav/invite-link-ocis-nc.txt","message":"Undefined variable $response at /var/www/html/lib/private/Files/Storage/DAV.php#305","userAgent":"Mozilla/5.0 (X11; Linux x86_64; rv:128.0) Gecko/20100101 Firefox/128.0","version":"27.1.10.2","data":{"app":"PHP"}}
172.20.0.6 - - [13/Aug/2024:07:46:15 +0000] "GET /index.php/apps/files/preview-service-worker.js HTTP/1.1" 200 6378 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:128.0) Gecko/20100101 Firefox/128.0"
172.20.0.6 - - [13/Aug/2024:07:46:15 +0000] "GET /remote.php/webdav/cron.php HTTP/1.1" 404 11967 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:128.0) Gecko/20100101 Firefox/128.0"
172.20.0.6 - - [13/Aug/2024:07:46:16 +0000] "GET /index.php/apps/files/preview-service-worker.js HTTP/1.1" 200 6378 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:128.0) Gecko/20100101 Firefox/128.0"

Nextcloud Json error prettified:

{
  "reqId": "wNqepFC11thAb4SizCMp",
  "level": 3,
  "time": "2024-08-13T07:46:14+00:00",
  "remoteAddr": "172.20.0.6",
  "user": "marie",
  "app": "PHP",
  "method": "GET",
  "url": "/remote.php/webdav/invite-link-ocis-nc.txt",
  "message": "Undefined variable $response at /var/www/html/lib/private/Files/Storage/DAV.php#305",
  "userAgent": "Mozilla/5.0 (X11; Linux x86_64; rv:128.0) Gecko/20100101 Firefox/128.0",
  "version": "27.1.10.2",
  "data": {
    "app": "PHP"
  }
}

This line:
https://github.com/nextcloud/server/blob/f7e1218ad98ab77de36edb7bd3ad3124d6e78ba9/lib/private/Files/Storage/DAV.php#L305

Probably a bug in Nextcloud core code.