Custom translation servers

With the usage of XLIFF and the freely available Pootle translation server, companies and individuals may easily set up a custom translation server for their extensions.

The event ModifyLanguagePackRemoteBaseUrlEvent can be caught to change the translation server URL, for example:

EXT:my_extension/Classes/EventListener/CustomMirror.php 
<?php

declare(strict_types=1);

namespace MyVendor\MyExtension\EventListener;

use TYPO3\CMS\Core\Attribute\AsEventListener;
use TYPO3\CMS\Core\Http\Uri;
use TYPO3\CMS\Install\Service\Event\ModifyLanguagePackRemoteBaseUrlEvent;

#[AsEventListener(
    identifier: 'my-extension/custom-mirror',
)]
final readonly class CustomMirror
{
    private const EXTENSION_KEY = 'my_extension';
    private const MIRROR_URL = 'https://example.org/typo3-packages/';

    public function __invoke(ModifyLanguagePackRemoteBaseUrlEvent $event): void
    {
        if ($event->getPackageKey() === self::EXTENSION_KEY) {
            $event->setBaseUrl(new Uri(self::MIRROR_URL));
        }
    }
}
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In the above example, the URL is changed only for a given extension, but of course it could be changed on a more general basis.

On the custom translation server side, the structure needs to be:

https://example.org/typo3-packages/
`-- <first-letter-of-extension-key>
    `-- <second-letter-of-extension-key>
        `-- <extension-key>-l10n
            |-- <extension-key>-l10n-de.zip
            |-- <extension-key>-l10n-fr.zip
            `-- <extension-key>-l10n-it.zip
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hence in our example:

https://example.org/typo3-packages/
`-- m
    `-- y
        `-- my_extension-l10n
            |-- my_extension-l10n-de.zip
            |-- my_extension-l10n-fr.zip
            `-- my_extension-l10n-it.zip
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