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<?php |
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|
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/** |
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* Provides permalink migration facilities |
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*/ |
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class Red_Permalinks { |
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/** |
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* List of migrated permalink structures |
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* |
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* @var string[] |
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*/ |
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private $permalinks = []; |
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|
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/** |
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* Current permalink structure |
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* |
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* @var string|null |
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*/ |
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private $current_permalink = null; |
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|
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/** |
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* Constructor |
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* |
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* @param string[] $permalinks List of migrated permalinks. |
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*/ |
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public function __construct( $permalinks ) { |
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$this->permalinks = $permalinks; |
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} |
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|
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/** |
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* Match and migrate any permalinks |
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* |
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* @param WP_Query $query Query. |
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* @return void |
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*/ |
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public function migrate( WP_Query $query ) { |
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global $wp; |
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|
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if ( count( $this->permalinks ) === 0 ) { |
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return; |
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} |
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|
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if ( ! $this->needs_migrating() ) { |
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return; |
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} |
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|
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$this->intercept_permalinks(); |
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|
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foreach ( $this->permalinks as $old ) { |
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// Set the current permalink |
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$this->current_permalink = $old; |
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|
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// Run the WP query again |
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$wp->init(); |
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$wp->parse_request(); |
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|
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// Anything matched? |
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if ( $wp->matched_rule ) { |
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// Perform the post query |
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$wp->query_posts(); |
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|
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// A single post? |
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if ( is_single() && count( $query->posts ) > 0 ) { |
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// Restore permalinks |
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$this->release_permalinks(); |
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|
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// Get real URL from the post ID |
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$url = get_permalink( $query->posts[0]->ID ); |
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if ( $url ) { |
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wp_safe_redirect( $url, 301, 'redirection' ); |
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die(); |
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} |
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} |
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|
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break; |
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} |
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} |
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|
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$this->release_permalinks(); |
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} |
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|
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/** |
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* Determine if the current request needs migrating. This is based on `WP::handle_404` in class-wp.php |
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* |
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* @return boolean |
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*/ |
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private function needs_migrating() { |
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global $wp_query; |
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|
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// It's a 404 - shortcut to yes |
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if ( is_404() ) { |
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return true; |
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} |
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|
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// Not admin pages |
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if ( is_admin() || is_robots() || is_favicon() ) { |
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return false; |
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} |
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|
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if ( $wp_query->posts && ! $wp_query->is_posts_page && empty( $this->query_vars['page'] ) ) { |
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return false; |
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} |
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|
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if ( ! is_paged() ) { |
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$author = get_query_var( 'author' ); |
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|
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// Don't 404 for authors without posts as long as they matched an author on this site. |
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if ( is_author() && is_numeric( $author ) && $author > 0 && is_user_member_of_blog( $author ) |
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// Don't 404 for these queries if they matched an object. |
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|| ( is_tag() || is_category() || is_tax() || is_post_type_archive() ) && get_queried_object() |
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// Don't 404 for these queries either. |
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|| is_home() || is_search() || is_feed() |
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) { |
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return false; |
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} |
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} |
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|
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// If we've got this far then it's a 404 |
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return true; |
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} |
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|
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/** |
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* Hook the permalink options and return the migrated one |
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* |
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* @return void |
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*/ |
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private function intercept_permalinks() { |
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add_filter( 'pre_option_rewrite_rules', [ $this, 'get_old_rewrite_rules' ] ); |
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add_filter( 'pre_option_permalink_structure', [ $this, 'get_old_permalink' ] ); |
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} |
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|
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/** |
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* Restore the hooked option |
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* |
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* @return void |
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*/ |
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private function release_permalinks() { |
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remove_filter( 'pre_option_rewrite_rules', [ $this, 'get_old_rewrite_rules' ] ); |
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remove_filter( 'pre_option_permalink_structure', [ $this, 'get_old_permalink' ] ); |
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} |
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|
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/** |
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* Returns rewrite rules for the current migrated permalink |
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* |
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* @param array $rules Current rules. |
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* @return array |
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*/ |
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public function get_old_rewrite_rules( $rules ) { |
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global $wp_rewrite; |
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|
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if ( $this->current_permalink ) { |
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$wp_rewrite->init(); |
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$wp_rewrite->matches = 'matches'; |
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return $wp_rewrite->rewrite_rules(); |
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} |
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|
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return $rules; |
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} |
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|
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/** |
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* Get the current migrated permalink structure |
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* |
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* @param string $result Current value. |
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* @return string |
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*/ |
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public function get_old_permalink( $result ) { |
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if ( $this->current_permalink ) { |
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return $this->current_permalink; |
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} |
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|
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return $result; |
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} |
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} |
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