Use TYPO3 Flow UriBuilder in a non-controller context (fx. in a service that is used by command controller)

CliEmailService.php

<?php

    ...

    /**
	 * @var \TYPO3\Flow\Mvc\Routing\UriBuilder
	 */
	protected $uriBuilder;

	/**
	 * @param \TYPO3\Flow\Configuration\ConfigurationManager $configurationManager
	 */
	public function injectUriBuilder(\TYPO3\Flow\Configuration\ConfigurationManager $configurationManager) {
		$flowSettings = $configurationManager->getConfiguration(ConfigurationManager::CONFIGURATION_TYPE_SETTINGS, 'TYPO3.Flow');
		$httpRequest = \TYPO3\Flow\Http\Request::create(new \TYPO3\Flow\Http\Uri('http://localhost'));
		$httpRequest->injectSettings($flowSettings);
		$request = new \TYPO3\Flow\Mvc\ActionRequest($httpRequest);

		$uriBuilder = new \TYPO3\Flow\Mvc\Routing\UriBuilder();
		$uriBuilder->setRequest($request);
		$uriBuilder->setCreateAbsoluteUri(TRUE);

		$this->uriBuilder = $uriBuilder;
	}

    ...

?>

Exactly what I was looking for, thank you!

I needed to make sure the routes configuration was loaded as well to make it work_

$flowSettings = $this->configurationManager->getConfiguration(\TYPO3\Flow\Configuration\ConfigurationManager::CONFIGURATION_TYPE_SETTINGS, 'TYPO3.Flow');
$httpRequest = \TYPO3\Flow\Http\Request::create(new \TYPO3\Flow\Http\Uri('http://opeepl.dev'));
$httpRequest->injectSettings($flowSettings);

$request = new \TYPO3\Flow\Mvc\ActionRequest($httpRequest);
$uriBuilder = new \TYPO3\Flow\Mvc\Routing\UriBuilder();
$uriBuilder->setRequest($request);

$routesConfiguration = $this->configurationManager>getConfiguration(\TYPO3\Flow\Configuration\ConfigurationManager::CONFIGURATION_TYPE_ROUTES);
$router = \TYPO3\Flow\Reflection\ObjectAccess::getProperty($uriBuilder, 'router', TRUE);

$router->setRoutesConfiguration($routesConfiguration);

Nice snippet thanks!

The httpRequest can be constructed with createFromEnvironment() now, so this worked for me:

$httpRequest = \TYPO3\Flow\Http\Request::createFromEnvironment();
$request = new \TYPO3\Flow\Mvc\ActionRequest($httpRequest);
$uriBuilder = new \TYPO3\Flow\Mvc\Routing\UriBuilder();
$uriBuilder->setRequest($request);
$this->uriBuilder = $uriBuilder;

Here is an example if you're using Extbase:

$objectManager = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance('TYPO3\CMS\Extbase\Object\ObjectManager');
$request = $objectManager->get(\TYPO3\CMS\Extbase\Mvc\Web\Request::class);
$request->setRequestURI(\TYPO3\CMS\Core\Utility\GeneralUtility::getIndpEnv('TYPO3_REQUEST_URL'));
$request->setBaseURI(\TYPO3\CMS\Core\Utility\GeneralUtility::getIndpEnv('TYPO3_SITE_URL'));
$this->uriBuilder = $this->objectManager->get(\TYPO3\CMS\Extbase\Mvc\Web\Routing\UriBuilder::class);
$this->uriBuilder->setRequest($request);