51 lines
2.4 KiB
Plaintext
51 lines
2.4 KiB
Plaintext
<?php
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/**
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* @file
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* Caches responses for anonymous users, request and response policies allowing.
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*/
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use Drupal\Core\Form\FormStateInterface;
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use Drupal\Core\PageCache\RequestPolicyInterface;
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use Drupal\Core\Routing\RouteMatchInterface;
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/**
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* Implements hook_help().
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*/
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function page_cache_help($route_name, RouteMatchInterface $route_match) {
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switch ($route_name) {
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case 'help.page.page_cache':
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$output = '<h3>' . t('About') . '</h3>';
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$output .= '<p>' . t('The Internal page cache module caches pages for anonymous users in the database.') . '</p>';
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$output .= '<h3>' . t('Uses') . '</h3>';
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$output .= '<dl>';
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$output .= '<dt>' . t('Speeding up your site') . '</dt>';
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$output .= '<dd>';
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$output .= '<p>' . t('Pages requested by anonymous users are stored the first time they are requested and then reused; depending on your site configuration and the amount of your web traffic tied to anonymous visitors, the caching system may significantly increase the speed of your site.');
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$output .= '<p>' . t('(For authenticated users, pages need to be assembled for each user individually, but anonymous users all get the exact same version of each page.)') . '</p>';
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$output .= '</dd>';
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$output .= '<dt>' . t('Configuring Internal page cache') . '</dt>';
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$output .= '<dd>';
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$output .= '<p>' . t('On the <a href="@cache-settings">Performance settings page</a>, you can configure how long browsers and proxies may cache pages, that setting is also respected by the Internal page cache module. There is no other configuration.', array('@cache-settings' => \Drupal::url('system.performance_settings'))) . '</p>';
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$output .= '</dd>';
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$output .= '</dl>';
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return $output;
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}
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}
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/**
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* Implements hook_form_alter().
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*/
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function page_cache_form_alter(&$form, FormStateInterface $form_state, $form_id) {
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// If the page that's being built is cacheable, set the 'immutable' flag, to
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// ensure that when the form is used, a new form build ID is generated when
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// appropriate, to prevent information disclosure.
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$request_policy = \Drupal::service('page_cache_request_policy');
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$request = \Drupal::requestStack()->getCurrentRequest();
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$request_is_cacheable = $request_policy->check($request) === RequestPolicyInterface::ALLOW;
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if ($request_is_cacheable) {
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$form_state->addBuildInfo('immutable', TRUE);
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}
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}
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