pankajlele/DetectLanguageComponent.php

## DetectLanguageComponent.php
<?php
namespace Wwwision\Test\Http;

/*                                                                        *
 * This script belongs to the TYPO3 Flow package "Wwwision.Test".         *
 *                                                                        *
 *                                                                        */

use TYPO3\Flow\Annotations as Flow;
use TYPO3\Flow\Http\Component\ComponentChain;
use TYPO3\Flow\Http\Component\ComponentContext;
use TYPO3\Flow\Http\Component\ComponentInterface;
use TYPO3\Flow\I18n\Detector;
use TYPO3\Flow\I18n\Locale;
use TYPO3\Neos\Domain\Service\ContentDimensionPresetSourceInterface;

/**
 * A HTTP component that detects the user agent language and redirects to a corresponding section
 */
class DetectLanguageComponent implements ComponentInterface {

	/**
	 * @Flow\Inject
	 * @var Detector
	 */
	protected $localeDetector;

	/**
	 * @Flow\Inject
	 * @var ContentDimensionPresetSourceInterface
	 */
	protected $contentDimensionPresetSource;

	/**
	 * @var array
	 */
	protected $options;

	/**
	 * @param array $options The component options
	 */
	public function __construct(array $options = array()) {
		$this->options = $options;
	}

	/**
	 * @param ComponentContext $componentContext
	 * @return void
	 */
	public function handle(ComponentContext $componentContext) {
		$httpRequest = $componentContext->getHttpRequest();
		$requestPath = $httpRequest->getUri()->getPath();

		if (preg_match($this->options['ignorePattern'], $requestPath) === 1) {
			return;
		}

		$firstRequestPathSegment = explode('/', ltrim($requestPath, '/'))[0];
		$preset = $this->contentDimensionPresetSource->findPresetByUriSegment('language', $firstRequestPathSegment);

		// first request path segment corresponds to a valid language preset -> no need to redirect
		if ($preset !== NULL) {
			return;
		}

		$detectedLocale = $this->localeDetector->detectLocaleFromHttpHeader($httpRequest->getHeader('Accept-Language'));
		if (!$detectedLocale instanceof Locale) {
			return;
		}

		$detectedLanguage = $detectedLocale->getLanguage();
		$preset = $this->contentDimensionPresetSource->findPresetByUriSegment('language', $detectedLanguage);

		// language preset for detected language is invalid -> do not redirect
		if ($preset === NULL) {
			return;
		}

		$uri = $httpRequest->getUri();
		$uri->setPath('/' . $detectedLanguage . $requestPath);

		$httpResponse = $componentContext->getHttpResponse();
		$httpResponse->setContent(sprintf('<html><head><meta http-equiv="refresh" content="0;url=%s"/></head></html>', htmlentities((string)$uri, ENT_QUOTES, 'utf-8')));
		$httpResponse->setStatus(303);
		$httpResponse->setHeader('Location', (string)$uri);

		$componentContext->setParameter(ComponentChain::class, 'cancel', TRUE);
	}
}

## Settings.yaml
TYPO3:
  Flow:
    http:
      chain:
        'preprocess':
          chain:
            'detectLanguage':
              component: 'Wwwision\Test\Http\DetectLanguageComponent'
              componentOptions:
                ignorePattern: '/(^\/neos|^\/@)/'
	<?php
	namespace Wwwision\Test\Http;

	/* *
	* This script belongs to the TYPO3 Flow package "Wwwision.Test". *
	* *
	* */

	use TYPO3\Flow\Annotations as Flow;
	use TYPO3\Flow\Http\Component\ComponentChain;
	use TYPO3\Flow\Http\Component\ComponentContext;
	use TYPO3\Flow\Http\Component\ComponentInterface;
	use TYPO3\Flow\I18n\Detector;
	use TYPO3\Flow\I18n\Locale;
	use TYPO3\Neos\Domain\Service\ContentDimensionPresetSourceInterface;

	/**
	* A HTTP component that detects the user agent language and redirects to a corresponding section
	*/
	class DetectLanguageComponent implements ComponentInterface {

	/**
	* @Flow\Inject
	* @var Detector
	*/
	protected $localeDetector;

	/**
	* @Flow\Inject
	* @var ContentDimensionPresetSourceInterface
	*/
	protected $contentDimensionPresetSource;

	/**
	* @var array
	*/
	protected $options;

	/**
	* @param array $options The component options
	*/
	public function __construct(array $options = array()) {
	$this->options = $options;
	}

	/**
	* @param ComponentContext $componentContext
	* @return void
	*/
	public function handle(ComponentContext $componentContext) {
	$httpRequest = $componentContext->getHttpRequest();
	$requestPath = $httpRequest->getUri()->getPath();

	if (preg_match($this->options['ignorePattern'], $requestPath) === 1) {
	return;
	}

	$firstRequestPathSegment = explode('/', ltrim($requestPath, '/'))[0];
	$preset = $this->contentDimensionPresetSource->findPresetByUriSegment('language', $firstRequestPathSegment);

	// first request path segment corresponds to a valid language preset -> no need to redirect
	if ($preset !== NULL) {
	return;
	}

	$detectedLocale = $this->localeDetector->detectLocaleFromHttpHeader($httpRequest->getHeader('Accept-Language'));
	if (!$detectedLocale instanceof Locale) {
	return;
	}

	$detectedLanguage = $detectedLocale->getLanguage();
	$preset = $this->contentDimensionPresetSource->findPresetByUriSegment('language', $detectedLanguage);

	// language preset for detected language is invalid -> do not redirect
	if ($preset === NULL) {
	return;
	}

	$uri = $httpRequest->getUri();
	$uri->setPath('/' . $detectedLanguage . $requestPath);

	$httpResponse = $componentContext->getHttpResponse();
	$httpResponse->setContent(sprintf('<html><head><meta http-equiv="refresh" content="0;url=%s"/></head></html>', htmlentities((string)$uri, ENT_QUOTES, 'utf-8')));
	$httpResponse->setStatus(303);
	$httpResponse->setHeader('Location', (string)$uri);

	$componentContext->setParameter(ComponentChain::class, 'cancel', TRUE);
	}
	}
	TYPO3:
	Flow:
	http:
	chain:
	'preprocess':
	chain:
	'detectLanguage':
	component: 'Wwwision\Test\Http\DetectLanguageComponent'
	componentOptions:
	ignorePattern: '/(^\/neos\|^\/@)/'