TYPO3 Core

I have a proposal for a solution to this problem.

Change lines 135-144 in typo3/mod/user/ws/wsol_preview.php to:

$pageId = intval(t3lib_div::_GP('id'));
                $language = intval(t3lib_div::_GP('L'));

// Get the domain record, if present:
                $domainRec = array();
                $pId = $pageId;
                while($page = t3lib_befunc::getRecord('pages',$pId)) {
                  $res = $GLOBALS['TYPO3_DB']->exec_SELECTquery('*','sys_domain','pid='.$pId.' AND redirectTo=\'\'','','sorting');
                  if($domainRec = $GLOBALS['TYPO3_DB']->sql_fetch_assoc($res)) {
                    break;
                  }
                  $pId = $page['pid'];
                }

// Set the prefix, if domain record found, use it:
                $prefix = t3lib_div::getIndpEnv('TYPO3_SITE_URL');
                if(!empty($domainRec)) {
                  $prefix = 'http://'.preg_replace('/\/$/','',$domainRec['domainName']).'/';
                }

$this->URL = array(
                                   'liveHeader' => 'wsol_preview.php?header=live',
                                   'draftHeader' => 'wsol_preview.php?header=draft',
                                   'live' => $prefix.'index.php?id='.$pageId.'&L='.$language.'&ADMCMD_noBeUser=1',
                                   'draft' => $prefix.'index.php?id='.$pageId.'&L='.$language.'&ADMCMD_view=1&ADMCMD_editIcons=1&ADMCMD_previewWS='.$this->workspace,
                                   'versionMod' => '../../../sysext/version/cm1/index.php?id='.intval(t3lib_div::_GP('id')).'&diffOnly=1'
                                   );

And if you want this to work (with the setup descriped in the problem) you need to setup your backend user sessions to work over multiple domains, which can be done with $TYPO3_CONF_VARS['SYS']['cookieDomain'] from the install tool.

Example for subdomains could be (be aware of the dot):
$TYPO3_CONF_VARS['SYS']['cookieDomain'] = .example.com

If this is implemented in the core, it might be a good idea to implement a warning message in the workspace preview, when you preview without beeing looked in (this happens if $TYPO3_CONF_VARS['SYS']['cookieDomain'] is not set correctly).

If you copy the above code, then be aware of that mantis is adding something to the end of the http thing

I had the same problem.
But I think the problem is in the function viewOnClick in the file t3lib/class.t3lib_befunc.php.

The path must be changed for the right domain also for the workspace preview instead of using only TYPO3_SITE_URL.

The patch "bug_3976.diff" solves the problem.

I use version 4.1.5 of TYPO3.

Doesn't the Draft-Preview require BE-user authentication? How will the browser submit the session-cookie from its "a.domain/typo3/" BE-Session when accessing the "b.domain/index.php?..."? Or isn't there any BE-access check for Workspace previews?

What exactly is the problem? In my eyes the Drafts-Preview should work without checking domain records and without using realurl, because:

http://a.domain/index.php?id=X

should output the same content as:

http://b.domain/index.php?id=X

If they both come from the same TYPO3 database. The "page-id" is unique across all domains, so no matter what domain you access it from. Isn't that working?

Cheers,
Ernesto

fixed in 4.2 RC2