Fetching backend user in TYPO3 v9 not possible

Question

I worked with older TYPO3 versions (< v9)

I am not able to fetch the logged in backend user in my frontend extension. In earlier TYPO3 versions I was able to do that.

Now when I logged in in TYPO3 backend and ask for it now it won't work anymore.

My approach is:

$context = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance(\TYPO3\CMS\Core\Context\Context::class);
$be_username = $context->getPropertyFromAspect('backend.user', 'username');

I am getting an empty string. I know that backend user might be not available for FE. But I need to check on him.

Thank you for any suggestions.

Benni · Accepted Answer · 2019-11-22 07:19:20Z

0

If you want to find out if a Backend user is currently logged in, then the code is exactly right (you don't even need to check on the username).

$context = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance(\TYPO3\CMS\Core\Context\Context::class);
$isLoggedIn = $context->getPropertyFromAspect('backend.user', 'isLoggedIn');

However, if you do this in your extension in a Plugin, that is cacheable ("USER" cObject, or a "non-cacheable action" in an Extbase Plugin), this information could be cached, which can lead to serious! sideffects.

In general, you should only check for a backend user in Frontend-related events, PSR-15 middlewares or hooks from TSFE, not in plugins/cObjects etc. unless you really know what you are doing.

All the best, Benni-

answered Nov 22, 2019 at 7:19

Benni

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3 Comments

Geee Over a year ago

Well, I checked the code in TYPO3 version 9.5.9, Its return username for me. Don't know what's wrong with his case.

user3332010 Over a year ago

@Benni: Thanks, Can you give me a short example how to do that with hooks from TSFE?

Benni Over a year ago

@user3332010 are you using an Extbase plugin? Can you share your ext_localconf.php where you register your actions?

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