Ticket #6481: 6481.13.diff

src/wp-admin/includes/upgrade.php

@@ -87 +87 @@
 
         wp_install_defaults($user_id);
 
+        wp_install_maybe_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_maybe_pretty_permalinks' ) ) :
+/**
+ * Enable pretty permalinks if available.
+ *
+ * This function will enable pretty permalinks if it can verify they work.
+ * If all pretty permalinks formats fail to work, WordPress 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_maybe_pretty_permalinks() {
+        global $wp_rewrite;
+
+        // Bail if we alredy have permalinks enabled (Multisite)
+        if ( get_option( 'permalink_structure' ) ) {
+                return;
+        }
+
+        /**
+         * Filter the permalink structures WordPress should attempt to use during instalation.
+         *
+         * The first default array item is designed for mod_rewrite or nginx rewriting, 
+         * the second is for PATHINFO based permalinks offered under configurations 
+         * without rewrites enabled.
+         *
+         * @since 4.2.0
+         *
+         * @param array $permalink_structures An array of potential Permalink structures.
+         *                                    Default is array containing 
+         *                                    '/%year%/%monthnum%/%day%/%postname%/' and 
+         *                                    '/index.php/%year%/%monthnum%/%day%/%postname%/'.
+         */
+        $permalink_structures = apply_filters( 'wp_install_permalink_structures', array(
+                '/%year%/%monthnum%/%day%/%postname%/',
+                '/index.php/%year%/%monthnum%/%day%/%postname%/'
+        ) );
+
+        foreach ( (array) $permalink_structures as $permalink_structure ) {
+                // Set the desired Permalink structure to try
+                $wp_rewrite->set_permalink_structure( $permalink_structure );
+
+                /*
+                 * 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 );
+
+                // Test against a real WordPress Post, or if none were created, a Page URI
+                $test_url = get_permalink( 1 );
+                if ( ! $test_url ) {
+                        $test_url = home_url( '/wordpress-check-for-rewrites/' );
+                }
+
+                /*
+                 * 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( $test_url, array( 'timeout' => 5 ) );
+                $x_pingback_header = wp_remote_retrieve_header( $response, 'x-pingback' );
+                $pretty_permalinks = $x_pingback_header && $x_pingback_header === get_bloginfo( 'pingback_url' );
+
+                if ( $pretty_permalinks ) {
+                        return true;
+                }
+        }
+
+        /*
+         * If it makes it this far, Pretty Permalinks failed to activate.
+         * Reset and allow the user to select it themselves.
+         */
+        $wp_rewrite->set_permalink_structure( '' );
+        $wp_rewrite->flush_rules( true );
+}
+endif;
+
 if ( !function_exists('wp_new_blog_notification') ) :
 /**
  * {@internal Missing Short Description}}