Ticket #6481: 6481.10.diff

src/wp-admin/includes/schema.php

@@ -397 +397 @@
         'links_updated_date_format' => __('F j, Y g:i a'),
         'comment_moderation' => 0,
         'moderation_notify' => 1,
-        'permalink_structure' => '',
+        'permalink_structure' => '/%year%/%monthnum%/%day%/%postname%/',
         'gzipcompression' => 0,
         'hack_file' => 0,
         'blog_charset' => 'UTF-8',
@@ -495 +495 @@
         if ( is_multisite() ) {
                 /* translators: blog tagline */
                 $options[ 'blogdescription' ] = sprintf(__('Just another %s site'), get_current_site()->site_name );
-                $options[ 'permalink_structure' ] = '/%year%/%monthnum%/%day%/%postname%/';
         }
 
         // Set autoload to no for these options

src/wp-admin/includes/upgrade.php

@@ -87 +87 @@
 
         wp_install_defaults($user_id);
 
+        wp_install_verify_pretty_permalinks();
+
         flush_rewrite_rules();
 
         wp_new_blog_notification($blog_title, $guessurl, $user_id, ($email_password ? $user_password : __('The password you chose during the install.') ) );
@@ -260 +262 @@
 }
 endif;
 
+if ( ! function_exists( 'wp_install_verify_pretty_permalinks' ) ) :
+/**
+ * Verify pretty permalinks.
+ *
+ * This function will verify that pretty permalinks work. If pretty permalinks
+ * fail to work, the web-server will fall back to ugly permalinks by setting
+ * an empty permalink structure.
+ *
+ * @since 4.2.0
+ *
+ * @global WP_Rewrite $wp_rewrite WordPress rewrite component.
+ */
+function wp_install_verify_pretty_permalinks() {
+        global $wp_rewrite;
+
+        /*
+         * Flush rules with the hard option to force refresh of the web-server's
+         * rewrite config file (e.g. .htaccess or web.config).
+         */
+        $wp_rewrite->flush_rules( true );
+
+        /*
+         * Send a HEAD request to a random page on the site, and check whether
+         * the 'x-pingback' header is returned as expected.
+         */
+        $response          = wp_remote_get( site_url( '/wordpress-check-for-rewrites/' ) );
+        $x_pingback_header = wp_remote_retrieve_header( $response, 'x-pingback' );
+        $pretty_permalinks = $x_pingback_header && $x_pingback_header === get_bloginfo( 'pingback_url' );
+
+        /*
+         * Fallback test that will send a HEAD request to the dummy post, 
+         * and check whether the response code returns 200 as expected.
+         */ 
+        if ( ! $pretty_permalinks ) {
+                $response          = wp_remote_head( get_permalink( 1 ) ); 
+                $pretty_permalinks = isset( $dummy_response['response']['code'] ) && 200 == $dummy_response['response']['code'];
+        }
+
+        /**
+         * Filter the pretty permalinks verification.
+         *
+         * @since 4.2.0
+         *
+         * @param bool $pretty_permalinks Pretty permalinks verified.
+         */
+        $pretty_permalinks = (bool) apply_filters( 'wp_install_verify_pretty_permalinks', $pretty_permalinks );
+
+        // Set an empty permalink structure to make it ugly again.
+        if ( ! $pretty_permalinks ) {
+                $wp_rewrite->set_permalink_structure('');
+        }
+}
+endif;
+
 if ( !function_exists('wp_new_blog_notification') ) :
 /**
  * {@internal Missing Short Description}}