How to generate an absolute URI from a Location with eZ Platform

GenerateAbsoluteLocationUriCommand.php

<?php
/**
 * @license For full copyright and license information view LICENSE file distributed with this source code.
 */
namespace BD\SandboxBundle\Command;

use eZ\Publish\Core\MVC\Symfony\Routing\RouteReference;
use eZ\Publish\Core\MVC\Symfony\SiteAccess;
use Symfony\Bundle\FrameworkBundle\Command\ContainerAwareCommand;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Output\OutputInterface;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\RequestStack;

class SandboxCommand extends ContainerAwareCommand
{
    protected function configure()
    {
        $this->setName('bd:sandbox');
    }

    protected function execute(InputInterface $input, OutputInterface $output)
    {
        $locationService = $this->getContainer()->get('ezpublish.api.service.location');

        $routeRefGenerator = $this->getContainer()->get('ezpublish.route_reference.generator');
        $requestStack = new RequestStack();
        $request = new Request();
        $requestStack->push($request);
        $routeRefGenerator->setRequestStack($requestStack);

        $this->getContainer()->get('ezpublish.siteaccess_router')->setSiteAccess(new SiteAccess('site'));

        $router = $this->getContainer()->get('router');

        $routeReference = $routeRefGenerator->generate($locationService->loadLocation(54));
        $routeReference->set('siteaccess', 'other_site');

        $output->writeln("url: " . $router->generate($routeReference, [], 'true'));
    }
}

In a web context, this should be sufficient:

$locationService = $this->getContainer()->get('ezpublish.api.service.location');
$routeRefGenerator = $this->getContainer()->get('ezpublish.route_reference.generator');
$router = $this->getContainer()->get('router');

$routeReference = $routeRefGenerator->generate($locationService->loadLocation(54));
$routeReference->set('siteaccess', 'other_site');

$link = $router->generate($routeReference, [], 'true');