SmartlingTranslator Plugin returns TypeError on PHP 8.1

Problem/Motivation

TMGMT Smartling module is returning an error on PHP 8.1 when the user attempts to create a translation job. Site has no translator credentials configured when the issue was prompted.

TypeError: strpos(): Argument #1 ($haystack) must be of type string, Drupal\Core\Url given in strpos() (line 358 of /var/www/html/docroot/core/lib/Drupal/Component/Utility/UrlHelper.php)
#0 /var/www/html/docroot/core/lib/Drupal/Component/Utility/UrlHelper.php(358): strpos(Object(Drupal\Core\Url), ':')
#1 /var/www/html/docroot/core/lib/Drupal/Component/Render/FormattableMarkup.php(213): Drupal\Component\Utility\UrlHelper::stripDangerousProtocols(Object(Drupal\Core\Url))
#2 /var/www/html/docroot/core/lib/Drupal/Core/StringTranslation/TranslatableMarkup.php(195): Drupal\Component\Render\FormattableMarkup::placeholderFormat('@translator is ...', Array)
#3 /var/www/html/docroot/core/lib/Drupal/Component/Utility/ToStringTrait.php(15): Drupal\Core\StringTranslation\TranslatableMarkup->render()
#4 /var/www/html/vendor/twig/twig/src/Environment.php(418) : eval()'d code(76): Drupal\Core\StringTranslation\TranslatableMarkup->__toString()
#5 /var/www/html/vendor/twig/twig/src/Template.php(405): __TwigTemplate_1765dca3c1f0df043f664df1920e822a22bd996ac05c9bcafab8d6fcf79f3cdb->doDisplay(Array, Array)
#6 /var/www/html/vendor/twig/twig/src/Template.php(378): Twig\Template->displayWithErrorHandling(Array, Array)
#7 /var/www/html/vendor/twig/twig/src/Template.php(390): Twig\Template->display(Array)
#8 /var/www/html/docroot/core/themes/engines/twig/twig.engine(55): Twig\Template->render(Array)
#9 /var/www/html/docroot/core/lib/Drupal/Core/Theme/ThemeManager.php(384): twig_render_template('core/themes/sev...', Array)
#10 /var/www/html/docroot/core/lib/Drupal/Core/Render/Renderer.php(478): Drupal\Core\Theme\ThemeManager->render('details', Array)
#11 /var/www/html/docroot/core/lib/Drupal/Core/Render/Renderer.php(435): Drupal\Core\Render\Renderer->doRender(Array)
#12 /var/www/html/docroot/core/lib/Drupal/Core/Render/Renderer.php(435): Drupal\Core\Render\Renderer->doRender(Array)
#13 /var/www/html/docroot/core/lib/Drupal/Core/Render/Renderer.php(201): Drupal\Core\Render\Renderer->doRender(Array, false)
#14 /var/www/html/docroot/core/lib/Drupal/Core/Render/MainContent/HtmlRenderer.php(241): Drupal\Core\Render\Renderer->render(Array, false)
#15 /var/www/html/docroot/core/lib/Drupal/Core/Render/Renderer.php(564): Drupal\Core\Render\MainContent\HtmlRenderer->Drupal\Core\Render\MainContent\{closure}()
#16 /var/www/html/docroot/core/lib/Drupal/Core/Render/MainContent/HtmlRenderer.php(242): Drupal\Core\Render\Renderer->executeInRenderContext(Object(Drupal\Core\Render\RenderContext), Object(Closure))
#17 /var/www/html/docroot/core/lib/Drupal/Core/Render/MainContent/HtmlRenderer.php(132): Drupal\Core\Render\MainContent\HtmlRenderer->prepare(Array, Object(Symfony\Component\HttpFoundation\Request), Object(Drupal\Core\Routing\CurrentRouteMatch))
#18 /var/www/html/docroot/core/lib/Drupal/Core/EventSubscriber/MainContentViewSubscriber.php(90): Drupal\Core\Render\MainContent\HtmlRenderer->renderResponse(Array, Object(Symfony\Component\HttpFoundation\Request), Object(Drupal\Core\Routing\CurrentRouteMatch))
#19 [internal function]: Drupal\Core\EventSubscriber\MainContentViewSubscriber->onViewRenderArray(Object(Symfony\Component\HttpKernel\Event\ViewEvent), 'kernel.view', Object(Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher))
#20 /var/www/html/docroot/core/lib/Drupal/Component/EventDispatcher/ContainerAwareEventDispatcher.php(142): call_user_func(Array, Object(Symfony\Component\HttpKernel\Event\ViewEvent), 'kernel.view', Object(Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher))
#21 /var/www/html/vendor/symfony/http-kernel/HttpKernel.php(174): Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch(Object(Symfony\Component\HttpKernel\Event\ViewEvent), 'kernel.view')
#22 /var/www/html/vendor/symfony/http-kernel/HttpKernel.php(81): Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object(Symfony\Component\HttpFoundation\Request), 1)
#23 /var/www/html/docroot/core/lib/Drupal/Core/StackMiddleware/Session.php(58): Symfony\Component\HttpKernel\HttpKernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#24 /var/www/html/docroot/core/lib/Drupal/Core/StackMiddleware/KernelPreHandle.php(48): Drupal\Core\StackMiddleware\Session->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#25 /var/www/html/docroot/core/modules/page_cache/src/StackMiddleware/PageCache.php(106): Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#26 /var/www/html/docroot/core/modules/page_cache/src/StackMiddleware/PageCache.php(85): Drupal\page_cache\StackMiddleware\PageCache->pass(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#27 /var/www/html/docroot/core/lib/Drupal/Core/StackMiddleware/ReverseProxyMiddleware.php(48): Drupal\page_cache\StackMiddleware\PageCache->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#28 /var/www/html/docroot/core/lib/Drupal/Core/StackMiddleware/NegotiationMiddleware.php(51): Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#29 /var/www/html/vendor/stack/builder/src/Stack/StackedHttpKernel.php(23): Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#30 /var/www/html/docroot/core/lib/Drupal/Core/DrupalKernel.php(709): Stack\StackedHttpKernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#31 /var/www/html/docroot/index.php(19): Drupal\Core\DrupalKernel->handle(Object(Symfony\Component\HttpFoundation\Request))
#32 {main}

Steps to reproduce

• Install TMGMT Smartling module on a Drupal 9.4 site
• Navigate to the job overview
• Add continuous job
• Error is shown

Proposed resolution

Use toString() method to the checkAvailable function

Remaining tasks

User interface changes

API changes

Data model changes