Collabora Online and SMB/CIFS

[rex105]

Steps to reproduce
1.Create SMB / CIFS external storage with option “Log-In credentials, save in session”
2.Use Collabora online to open any Office file from this storage.

Expected behaviour
Document opens in Collabora Office.

Actual behaviour
You receive a message: "Failed to read document from storage. Please contact your storage server (you.host.name) administrator.

Server configuration
CentOS Linux release 7.7.1908
Apache 2.4.6
MariaDB 5.5.64
php 7.2.25
ownCloud 10.3.2
CODE-brand-4.0-2
loolwsd-4.0.9
Collabora Online 2.2.0

Additional info:
Everything works fine when I create SMB / CIFS external storage with option “Username and Password”. I may be wrong, but I think that it means that Owncloud can’t translate credentials to Collabora Online.

I, also, see this in log (corrected):
Dec 25 14:31:28 my-host-name ownCloud[6981]: [XgNIkMidtdBX5PI3n0IqrgAAAAM][IP.IP.IP.IP][1E302CBD-16AE-4A25-8943-D2399C1BBE21][richdocuments][GET][/index.php/apps/richdocuments/wopi/files/2355_ocpwuq48hvp9_0_0?access_token=vnMR6djYyacvhuirZMUitAHK9YPrMvPS&access_token_ttl=0&reuse_cookies=_ym_d%3D1571316561%3A_ga%3DGA1.2.643618832.1548410423%3A_ym_uid%3D1548…7902%3Aocp…vp9%3D0gk2eosm2h227sbnq17d0pj50t%3Aoc_sessionPassphrase%3DNppgeuDF07Pp%2F6W…Ut%2FS3%2F8pnH1ZDaMnv…cooQfJPYsmdlJfJMg0WDsLBPYMmRkDzH2P&permission=edit] wopiCheckFileInfo(): Could not retrieve file

[rex105]

After some investigation I found this.

If in DocumentController.php I change this:

if (!$this->appConfig->encryptionEnabled()) {
// Set session for a user
\OC::$server->getUserSession()->setUser($user);

to this (add just one line):

if (!$this->appConfig->encryptionEnabled()) {
// Set session for a user
\OC::$server->getUserSession()->setUser($user);
\OC_Hook::emit('OC_User', 'post_login', ['run' => true, 'uid' => $user->getUID(), 'password' => 'myuserpassword']);

everything starts working for my session only (because of the constant ‘myuserpassword’)

As workaround, if there's no other way, how can I get the password which have been saved for SMB connection and insert it here for current user session?