context_suite-8.x-1.0-beta1/src/Plugin/Condition/RequestPathRegex.php

<?php

namespace Drupal\context_suite\Plugin\Condition;

use Drupal\Core\Condition\ConditionPluginBase;
use Drupal\Core\Config\ConfigFactoryInterface;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Path\AliasManagerInterface;
use Drupal\Core\Path\CurrentPathStack;
use Drupal\Core\Path\PathMatcherInterface;
use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;
use Symfony\Component\HttpFoundation\RequestStack;

/**
 * Provides a 'Request Path Regex' condition.
 *
 * @Condition(
 *   id = "request_path_regex",
 *   label = @Translation("Request Path Regex"),
 * )
 */
class RequestPathRegex extends ConditionPluginBase implements ContainerFactoryPluginInterface {

  /**
   * The default front page.
   *
   * @var string
   */
  protected $frontPage;

  /**
   * An alias manager to find the alias for the current system path.
   *
   * @var \Drupal\Core\Path\AliasManagerInterface
   */
  protected $aliasManager;

  /**
   * The path matcher.
   *
   * @var \Drupal\Core\Path\PathMatcherInterface
   */
  protected $pathMatcher;

  /**
   * The request stack.
   *
   * @var \Symfony\Component\HttpFoundation\RequestStack
   */
  protected $requestStack;

  /**
   * The current path.
   *
   * @var \Drupal\Core\Path\CurrentPathStack
   */
  protected $currentPath;

  /**
   * The cache of regular expressions.
   *
   * @var array
   */
  protected $regexes;

  /**
   * The config factory service.
   *
   * @var \Drupal\Core\Config\ConfigFactoryInterface
   */
  protected $configFactory;

  /**
   * Constructs a RequestPath condition plugin.
   *
   * @param \Drupal\Core\Path\AliasManagerInterface $alias_manager
   *   An alias manager to find the alias for the current system path.
   * @param \Drupal\Core\Path\PathMatcherInterface $path_matcher
   *   The path matcher service.
   * @param \Symfony\Component\HttpFoundation\RequestStack $request_stack
   *   The request stack.
   * @param \Drupal\Core\Path\CurrentPathStack $current_path
   *   The current path.
   * @param array $configuration
   *   A configuration array containing information about the plugin instance.
   * @param string $plugin_id
   *   The plugin_id for the plugin instance.
   * @param array $plugin_definition
   *   The plugin implementation definition.
   * @param \Drupal\Core\Config\ConfigFactoryInterface $config_factory
   *   The config factory.
   */
  public function __construct(AliasManagerInterface $alias_manager, PathMatcherInterface $path_matcher, RequestStack $request_stack, CurrentPathStack $current_path, array $configuration, $plugin_id, array $plugin_definition, ConfigFactoryInterface $config_factory) {
    parent::__construct($configuration, $plugin_id, $plugin_definition);
    $this->aliasManager = $alias_manager;
    $this->pathMatcher = $path_matcher;
    $this->requestStack = $request_stack;
    $this->currentPath = $current_path;
    $this->configFactory = $config_factory;
  }

  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
    return new static(
      $container->get('path.alias_manager'),
      $container->get('path.matcher'),
      $container->get('request_stack'),
      $container->get('path.current'),
      $configuration,
      $plugin_id,
      $plugin_definition,
      $container->get('config.factory')
      );
  }

  /**
   * {@inheritdoc}
   */
  public function defaultConfiguration() {
    return ['pages' => ''] + parent::defaultConfiguration();
  }

  /**
   * {@inheritdoc}
   */
  public function buildConfigurationForm(array $form, FormStateInterface $form_state) {
    $form['pages'] = [
      '#type' => 'textarea',
      '#title' => $this->t('Pages'),
      '#default_value' => $this->configuration['pages'],
      '#description' => $this->t("Specify pages by using their paths regular expression. Enter one path per line.<br>An example path is <strong>@user-wildcard</strong> for every user page.<br> %front is the front page.", [
        '@user-wildcard' => '\/user\/([0-9]+)',
        '%front' => '<front>',
      ]),
    ];
    return parent::buildConfigurationForm($form, $form_state);
  }

  /**
   * {@inheritdoc}
   */
  public function submitConfigurationForm(array &$form, FormStateInterface $form_state) {
    $this->configuration['pages'] = $form_state->getValue('pages');
    parent::submitConfigurationForm($form, $form_state);
  }

  /**
   * {@inheritdoc}
   */
  public function summary() {
    $pages = array_map('trim', explode("\n", $this->configuration['pages']));
    $pages = implode(', ', $pages);
    if (!empty($this->configuration['negate'])) {
      return $this->t('Do not return true on the following pages: @pages', ['@pages' => $pages]);
    }
    return $this->t('Return true on the following pages: @pages', ['@pages' => $pages]);
  }

  /**
   * {@inheritdoc}
   */
  public function evaluate() {
    // Convert path to lowercase. This allows comparison of the same path
    // with different case. Ex: /Page, /page, /PAGE.
    $pages = mb_strtolower($this->configuration['pages']);
    if (!$pages) {
      return TRUE;
    }

    $request = $this->requestStack->getCurrentRequest();
    // Compare the lowercase path alias (if any) and internal path.
    $path = $this->currentPath->getPath($request);
    // Do not trim a trailing slash if that is the complete path.
    $path = $path === '/' ? $path : rtrim($path, '/');
    $path_alias = mb_strtolower($this->aliasManager->getAliasByPath($path));

    return $this->matchPath($path_alias, $pages) || (($path != $path_alias) && $this->matchPath($path, $pages));
  }

  /**
   * Checks if a path matches any pattern in a set of patterns.
   *
   * @param string $path
   *   The path to match.
   * @param string $patterns
   *   A set of patterns separated by a newline.
   *
   * @return bool
   *   TRUE if the path matches a pattern, FALSE otherwise.
   */
  public function matchPath($path, $patterns) {

    if (!isset($this->regexes[$patterns])) {
      // Convert path settings to a regular expression.
      $to_replace = [
        // Replace newlines with a logical 'or'.
        '/(\r\n?|\n)/',
        // Quote <front> keyword.
        '/(^|\|)\\\\<front\\\\>($|\|)/',
      ];
      $replacements = [
        '|',
        '\1' . preg_quote($this->getFrontPagePath(), '/') . '\2',
      ];
      $this->regexes[$patterns] = '/^(' . preg_replace($to_replace, $replacements, $patterns) . ')$/';
    }
    return (bool) preg_match($this->regexes[$patterns], $path);
  }

  /**
   * Gets the current front page path.
   *
   * @return string
   *   The front page path.
   */
  protected function getFrontPagePath() {
    // Lazy-load front page config.
    if (!isset($this->frontPage)) {
      $this->frontPage = $this->configFactory->get('system.site')
        ->get('page.front');
    }
    return $this->frontPage;
  }

  /**
   * {@inheritdoc}
   */
  public function getCacheContexts() {
    $contexts = parent::getCacheContexts();
    $contexts[] = 'url.path';
    return $contexts;
  }

}