370 lines
15 KiB
PHP
370 lines
15 KiB
PHP
<?php
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/**
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* Canonical API to handle WordPress Redirecting
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*
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* Based on "Permalink Redirect" from Scott Yang and "Enforce www. Preference"
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* by Mark Jaquith
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*
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* @author Scott Yang
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* @author Mark Jaquith
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* @package WordPress
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* @since 2.3.0
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*/
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/**
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* Redirects incoming links to the proper URL based on the site url.
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*
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* Search engines consider www.somedomain.com and somedomain.com to be two
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* different URLs when they both go to the same location. This SEO enhancement
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* prevents penality for duplicate content by redirecting all incoming links to
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* one or the other.
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*
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* Prevents redirection for feeds, trackbacks, searches, comment popup, and
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* admin URLs. Does not redirect on IIS, page/post previews, and on form data.
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*
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* Will also attempt to find the correct link when a user enters a URL that does
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* not exist based on exact WordPress query. Will instead try to parse the URL
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* or query in an attempt to figure the correct page to go to.
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*
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* @since 2.3.0
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* @uses $wp_rewrite
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* @uses $is_IIS
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*
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* @param string $requested_url Optional. The URL that was requested, used to
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* figure if redirect is needed.
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* @param bool $do_redirect Optional. Redirect to the new URL.
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* @return null|false|string Null, if redirect not needed. False, if redirect
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* not needed or the string of the URL
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*/
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function redirect_canonical($requested_url=null, $do_redirect=true) {
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global $wp_rewrite, $is_IIS, $wp_query, $wpdb;
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if ( is_trackback() || is_search() || is_comments_popup() || is_admin() || $is_IIS || ( isset($_POST) && count($_POST) ) || is_preview() || is_robots() )
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return;
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if ( !$requested_url ) {
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// build the URL in the address bar
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$requested_url = ( !empty($_SERVER['HTTPS'] ) && strtolower($_SERVER['HTTPS']) == 'on' ) ? 'https://' : 'http://';
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$requested_url .= $_SERVER['HTTP_HOST'];
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$requested_url .= $_SERVER['REQUEST_URI'];
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}
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$original = @parse_url($requested_url);
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if ( false === $original )
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return;
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// Some PHP setups turn requests for / into /index.php in REQUEST_URI
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// See: http://trac.wordpress.org/ticket/5017
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// See: http://trac.wordpress.org/ticket/7173
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// Disabled, for now:
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// $original['path'] = preg_replace('|/index\.php$|', '/', $original['path']);
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$redirect = $original;
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$redirect_url = false;
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// Notice fixing
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if ( !isset($redirect['path']) ) $redirect['path'] = '';
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if ( !isset($redirect['query']) ) $redirect['query'] = '';
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if ( is_singular() && 1 > $wp_query->post_count && ($id = get_query_var('p')) ) {
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$vars = $wpdb->get_results( $wpdb->prepare("SELECT post_type, post_parent FROM $wpdb->posts WHERE ID = %d", $id) );
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if ( isset($vars[0]) && $vars = $vars[0] ) {
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if ( 'revision' == $vars->post_type && $vars->post_parent > 0 )
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$id = $vars->post_parent;
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if ( $redirect_url = get_permalink($id) )
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$redirect['query'] = remove_query_arg(array('p', 'page_id', 'attachment_id'), $redirect['query']);
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}
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}
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// These tests give us a WP-generated permalink
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if ( is_404() ) {
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$redirect_url = redirect_guess_404_permalink();
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} elseif ( is_object($wp_rewrite) && $wp_rewrite->using_permalinks() ) {
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// rewriting of old ?p=X, ?m=2004, ?m=200401, ?m=20040101
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if ( is_attachment() && !empty($_GET['attachment_id']) && ! $redirect_url ) {
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if ( $redirect_url = get_attachment_link(get_query_var('attachment_id')) )
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$redirect['query'] = remove_query_arg('attachment_id', $redirect['query']);
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} elseif ( is_single() && !empty($_GET['p']) && ! $redirect_url ) {
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if ( $redirect_url = get_permalink(get_query_var('p')) )
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$redirect['query'] = remove_query_arg('p', $redirect['query']);
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if ( get_query_var( 'page' ) ) {
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$redirect_url = trailingslashit( $redirect_url ) . user_trailingslashit( get_query_var( 'page' ), 'single_paged' );
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$redirect['query'] = remove_query_arg( 'page', $redirect['query'] );
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}
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} elseif ( is_single() && !empty($_GET['name']) && ! $redirect_url ) {
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if ( $redirect_url = get_permalink( $wp_query->get_queried_object_id() ) )
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$redirect['query'] = remove_query_arg('name', $redirect['query']);
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} elseif ( is_page() && !empty($_GET['page_id']) && ! $redirect_url ) {
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if ( $redirect_url = get_permalink(get_query_var('page_id')) )
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$redirect['query'] = remove_query_arg('page_id', $redirect['query']);
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} elseif ( is_page() && isset($wp_query->queried_object) && 'page' == get_option('show_on_front') && $wp_query->queried_object->ID == get_option('page_on_front') && ! $redirect_url ) {
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$redirect_url = home_url('/');
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} elseif ( is_home() && !empty($_GET['page_id']) && 'page' == get_option('show_on_front') && get_query_var('page_id') == get_option('page_for_posts') && ! $redirect_url ) {
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if ( $redirect_url = get_permalink(get_option('page_for_posts')) )
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$redirect['query'] = remove_query_arg('page_id', $redirect['query']);
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} elseif ( !empty($_GET['m']) && ( is_year() || is_month() || is_day() ) ) {
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$m = get_query_var('m');
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switch ( strlen($m) ) {
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case 4: // Yearly
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$redirect_url = get_year_link($m);
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break;
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case 6: // Monthly
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$redirect_url = get_month_link( substr($m, 0, 4), substr($m, 4, 2) );
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break;
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case 8: // Daily
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$redirect_url = get_day_link(substr($m, 0, 4), substr($m, 4, 2), substr($m, 6, 2));
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break;
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}
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if ( $redirect_url )
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$redirect['query'] = remove_query_arg('m', $redirect['query']);
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// now moving on to non ?m=X year/month/day links
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} elseif ( is_day() && get_query_var('year') && get_query_var('monthnum') && !empty($_GET['day']) ) {
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if ( $redirect_url = get_day_link(get_query_var('year'), get_query_var('monthnum'), get_query_var('day')) )
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$redirect['query'] = remove_query_arg(array('year', 'monthnum', 'day'), $redirect['query']);
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} elseif ( is_month() && get_query_var('year') && !empty($_GET['monthnum']) ) {
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if ( $redirect_url = get_month_link(get_query_var('year'), get_query_var('monthnum')) )
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$redirect['query'] = remove_query_arg(array('year', 'monthnum'), $redirect['query']);
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} elseif ( is_year() && !empty($_GET['year']) ) {
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if ( $redirect_url = get_year_link(get_query_var('year')) )
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$redirect['query'] = remove_query_arg('year', $redirect['query']);
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} elseif ( is_category() && !empty($_GET['cat']) && preg_match( '|^[0-9]+$|', $_GET['cat'] ) ) {
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if ( $redirect_url = get_category_link(get_query_var('cat')) )
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$redirect['query'] = remove_query_arg('cat', $redirect['query']);
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} elseif ( is_author() && !empty($_GET['author']) && preg_match( '|^[0-9]+$|', $_GET['author'] ) ) {
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$author = get_userdata(get_query_var('author'));
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if ( false !== $author && $redirect_url = get_author_posts_url($author->ID, $author->user_nicename) )
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$redirect['query'] = remove_query_arg('author', $redirect['query']);
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}
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// redirect sub-terms of taxonomies to their correct urls
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if ( is_category() || is_tax() ) {
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if ( is_category() ) {
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$taxonomy = 'category';
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$slug = get_query_var('category_name');
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} else {
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$taxonomy = get_query_var('taxonomy');
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$slug = get_query_var('term');
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}
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if ( $tax_url = get_term_link($slug, $taxonomy) ) {
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$tax_url = parse_url($tax_url);
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$redirect['path'] = $tax_url['path'];
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}
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}
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// paging and feeds
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if ( get_query_var('paged') || is_feed() || get_query_var('cpage') ) {
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if ( !$redirect_url )
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$redirect_url = $requested_url;
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$paged_redirect = @parse_url($redirect_url);
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while ( preg_match( '#/page/[0-9]+?(/+)?$#', $paged_redirect['path'] ) || preg_match( '#/(comments/?)?(feed|rss|rdf|atom|rss2)(/+)?$#', $paged_redirect['path'] ) || preg_match( '#/comment-page-[0-9]+(/+)?$#', $paged_redirect['path'] ) ) {
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// Strip off paging and feed
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$paged_redirect['path'] = preg_replace('#/page/[0-9]+?(/+)?$#', '/', $paged_redirect['path']); // strip off any existing paging
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$paged_redirect['path'] = preg_replace('#/(comments/?)?(feed|rss2?|rdf|atom)(/+|$)#', '/', $paged_redirect['path']); // strip off feed endings
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$paged_redirect['path'] = preg_replace('#/comment-page-[0-9]+?(/+)?$#', '/', $paged_redirect['path']); // strip off any existing comment paging
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}
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$addl_path = '';
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if ( is_feed() ) {
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$addl_path = !empty( $addl_path ) ? trailingslashit($addl_path) : '';
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if ( get_query_var( 'withcomments' ) )
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$addl_path .= 'comments/';
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$addl_path .= user_trailingslashit( 'feed/' . ( ( 'rss2' == get_query_var('feed') || 'feed' == get_query_var('feed') ) ? '' : get_query_var('feed') ), 'feed' );
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$redirect['query'] = remove_query_arg( 'feed', $redirect['query'] );
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}
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if ( get_query_var('paged') > 0 ) {
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$paged = get_query_var('paged');
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$redirect['query'] = remove_query_arg( 'paged', $redirect['query'] );
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if ( !is_feed() ) {
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if ( $paged > 1 && !is_single() ) {
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$addl_path = ( !empty( $addl_path ) ? trailingslashit($addl_path) : '' ) . user_trailingslashit("page/$paged", 'paged');
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} elseif ( !is_single() ) {
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$addl_path = !empty( $addl_path ) ? trailingslashit($addl_path) : '';
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}
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} elseif ( $paged > 1 ) {
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$redirect['query'] = add_query_arg( 'paged', $paged, $redirect['query'] );
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}
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}
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if ( get_option('page_comments') && ( ( 'newest' == get_option('default_comments_page') && get_query_var('cpage') > 0 ) || ( 'newest' != get_option('default_comments_page') && get_query_var('cpage') > 1 ) ) ) {
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$addl_path = ( !empty( $addl_path ) ? trailingslashit($addl_path) : '' ) . user_trailingslashit( 'comment-page-' . get_query_var('cpage'), 'commentpaged' );
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$redirect['query'] = remove_query_arg( 'cpage', $redirect['query'] );
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}
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$paged_redirect['path'] = user_trailingslashit( preg_replace('|/index.php/?$|', '/', $paged_redirect['path']) ); // strip off trailing /index.php/
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if ( !empty( $addl_path ) && $wp_rewrite->using_index_permalinks() && strpos($paged_redirect['path'], '/index.php/') === false )
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$paged_redirect['path'] = trailingslashit($paged_redirect['path']) . 'index.php/';
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if ( !empty( $addl_path ) )
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$paged_redirect['path'] = trailingslashit($paged_redirect['path']) . $addl_path;
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$redirect_url = $paged_redirect['scheme'] . '://' . $paged_redirect['host'] . $paged_redirect['path'];
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$redirect['path'] = $paged_redirect['path'];
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}
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}
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// tack on any additional query vars
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$redirect['query'] = preg_replace( '#^\??&*?#', '', $redirect['query'] );
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if ( $redirect_url && !empty($redirect['query']) ) {
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if ( strpos($redirect_url, '?') !== false )
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$redirect_url .= '&';
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else
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$redirect_url .= '?';
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$redirect_url .= $redirect['query'];
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}
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if ( $redirect_url )
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$redirect = @parse_url($redirect_url);
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// www.example.com vs example.com
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$user_home = @parse_url(home_url());
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if ( !empty($user_home['host']) )
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$redirect['host'] = $user_home['host'];
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if ( empty($user_home['path']) )
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$user_home['path'] = '/';
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// Handle ports
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if ( !empty($user_home['port']) )
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$redirect['port'] = $user_home['port'];
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else
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unset($redirect['port']);
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// trailing /index.php
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$redirect['path'] = preg_replace('|/index.php/*?$|', '/', $redirect['path']);
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// Remove trailing spaces from the path
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$redirect['path'] = preg_replace( '#(%20| )+$#', '', $redirect['path'] );
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if ( !empty( $redirect['query'] ) ) {
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// Remove trailing spaces from certain terminating query string args
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$redirect['query'] = preg_replace( '#((p|page_id|cat|tag)=[^&]*?)(%20| )+$#', '$1', $redirect['query'] );
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// Clean up empty query strings
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$redirect['query'] = trim(preg_replace( '#(^|&)(p|page_id|cat|tag)=?(&|$)#', '&', $redirect['query']), '&');
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// Remove redundant leading ampersands
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$redirect['query'] = preg_replace( '#^\??&*?#', '', $redirect['query'] );
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}
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// strip /index.php/ when we're not using PATHINFO permalinks
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if ( !$wp_rewrite->using_index_permalinks() )
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$redirect['path'] = str_replace('/index.php/', '/', $redirect['path']);
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// trailing slashes
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if ( is_object($wp_rewrite) && $wp_rewrite->using_permalinks() && !is_404() && (!is_front_page() || ( is_front_page() && (get_query_var('paged') > 1) ) ) ) {
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$user_ts_type = '';
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if ( get_query_var('paged') > 0 ) {
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$user_ts_type = 'paged';
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} else {
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foreach ( array('single', 'category', 'page', 'day', 'month', 'year', 'home') as $type ) {
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$func = 'is_' . $type;
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if ( call_user_func($func) ) {
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$user_ts_type = $type;
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break;
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}
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}
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}
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$redirect['path'] = user_trailingslashit($redirect['path'], $user_ts_type);
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} elseif ( is_front_page() ) {
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$redirect['path'] = trailingslashit($redirect['path']);
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}
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// Strip multiple slashes out of the URL
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if ( strpos($redirect['path'], '//') > -1 )
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$redirect['path'] = preg_replace('|/+|', '/', $redirect['path']);
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// Always trailing slash the Front Page URL
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if ( trailingslashit( $redirect['path'] ) == trailingslashit( $user_home['path'] ) )
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$redirect['path'] = trailingslashit($redirect['path']);
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// Ignore differences in host capitalization, as this can lead to infinite redirects
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// Only redirect no-www <=> yes-www
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if ( strtolower($original['host']) == strtolower($redirect['host']) ||
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( strtolower($original['host']) != 'www.' . strtolower($redirect['host']) && 'www.' . strtolower($original['host']) != strtolower($redirect['host']) ) )
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$redirect['host'] = $original['host'];
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$compare_original = array($original['host'], $original['path']);
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if ( !empty( $original['port'] ) )
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$compare_original[] = $original['port'];
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if ( !empty( $original['query'] ) )
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$compare_original[] = $original['query'];
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$compare_redirect = array($redirect['host'], $redirect['path']);
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if ( !empty( $redirect['port'] ) )
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$compare_redirect[] = $redirect['port'];
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if ( !empty( $redirect['query'] ) )
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$compare_redirect[] = $redirect['query'];
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if ( $compare_original !== $compare_redirect ) {
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$redirect_url = $redirect['scheme'] . '://' . $redirect['host'];
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if ( !empty($redirect['port']) )
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$redirect_url .= ':' . $redirect['port'];
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$redirect_url .= $redirect['path'];
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if ( !empty($redirect['query']) )
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$redirect_url .= '?' . $redirect['query'];
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}
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if ( !$redirect_url || $redirect_url == $requested_url )
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return false;
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// Note that you can use the "redirect_canonical" filter to cancel a canonical redirect for whatever reason by returning FALSE
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$redirect_url = apply_filters('redirect_canonical', $redirect_url, $requested_url);
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if ( !$redirect_url || $redirect_url == $requested_url ) // yes, again -- in case the filter aborted the request
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return false;
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if ( $do_redirect ) {
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// protect against chained redirects
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if ( !redirect_canonical($redirect_url, false) ) {
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wp_redirect($redirect_url, 301);
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exit();
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} else {
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// Debug
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// die("1: $redirect_url<br />2: " . redirect_canonical( $redirect_url, false ) );
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return false;
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}
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} else {
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return $redirect_url;
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}
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}
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/**
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* Attempts to guess correct post based on query vars.
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*
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* @since 2.3.0
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* @uses $wpdb
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*
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* @return bool|string Returns False, if it can't find post, returns correct
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* location on success.
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*/
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function redirect_guess_404_permalink() {
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global $wpdb;
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if ( !get_query_var('name') )
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return false;
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$where = $wpdb->prepare("post_name LIKE %s", get_query_var('name') . '%');
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// if any of year, monthnum, or day are set, use them to refine the query
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if ( get_query_var('year') )
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$where .= $wpdb->prepare(" AND YEAR(post_date) = %d", get_query_var('year'));
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if ( get_query_var('monthnum') )
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$where .= $wpdb->prepare(" AND MONTH(post_date) = %d", get_query_var('monthnum'));
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if ( get_query_var('day') )
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$where .= $wpdb->prepare(" AND DAYOFMONTH(post_date) = %d", get_query_var('day'));
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$post_id = $wpdb->get_var("SELECT ID FROM $wpdb->posts WHERE $where AND post_status = 'publish'");
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if ( !$post_id )
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return false;
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return get_permalink($post_id);
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}
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add_action('template_redirect', 'redirect_canonical');
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?>
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