| 1 | <?php
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| 2 | /**
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| 3 | * Canonical API to handle WordPress Redirecting
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| 4 | *
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| 5 | * Based on "Permalink Redirect" from Scott Yang and "Enforce www. Preference"
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| 6 | * by Mark Jaquith
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| 7 | *
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| 8 | * @author Scott Yang
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| 9 | * @author Mark Jaquith
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| 10 | * @package WordPress
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| 11 | * @since 2.3.0
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| 12 | */
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| 13 |
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| 14 | /**
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| 15 | * Redirects incoming links to the proper URL based on the site url.
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| 16 | *
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| 17 | * Search engines consider www.somedomain.com and somedomain.com to be two
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| 18 | * different URLs when they both go to the same location. This SEO enhancement
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| 19 | * prevents penality for duplicate content by redirecting all incoming links to
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| 20 | * one or the other.
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| 21 | *
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| 22 | * Prevents redirection for feeds, trackbacks, searches, comment popup, and
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| 23 | * admin URLs. Does not redirect on IIS, page/post previews, and on form data.
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| 24 | *
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| 25 | * Will also attempt to find the correct link when a user enters a URL that does
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| 26 | * not exist based on exact WordPress query. Will instead try to parse the URL
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| 27 | * or query in an attempt to figure the correct page to go to.
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| 28 | *
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| 29 | * @since 2.3.0
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| 30 | * @uses $wp_rewrite
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| 31 | * @uses $is_IIS
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| 32 | *
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| 33 | * @param string $requested_url Optional. The URL that was requested, used to
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| 34 | * figure if redirect is needed.
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| 35 | * @param bool $do_redirect Optional. Redirect to the new URL.
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| 36 | * @return null|false|string Null, if redirect not needed. False, if redirect
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| 37 | * not needed or the string of the URL
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| 38 | */
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| 39 | function redirect_canonical($requested_url=null, $do_redirect=true) {
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| 40 | global $wp_rewrite, $is_IIS, $wp_query, $wpdb;
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| 41 |
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| 42 | if ( is_trackback() || is_search() || is_comments_popup() || is_admin() || $is_IIS || ( isset($_POST) && count($_POST) ) || is_preview() || is_robots() )
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| 43 | return;
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| 44 |
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| 45 | if ( !$requested_url ) {
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| 46 | // build the URL in the address bar
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| 47 | $requested_url = ( !empty($_SERVER['HTTPS'] ) && strtolower($_SERVER['HTTPS']) == 'on' ) ? 'https://' : 'http://';
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| 48 | $requested_url .= $_SERVER['HTTP_HOST'];
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| 49 | $requested_url .= $_SERVER['REQUEST_URI'];
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| 50 | }
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| 51 |
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| 52 | $original = @parse_url($requested_url);
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| 53 | if ( false === $original )
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| 54 | return;
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| 55 |
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| 56 | // Some PHP setups turn requests for / into /index.php in REQUEST_URI
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| 57 | // See: http://trac.wordpress.org/ticket/5017
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| 58 | // See: http://trac.wordpress.org/ticket/7173
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| 59 | // Disabled, for now:
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| 60 | // $original['path'] = preg_replace('|/index\.php$|', '/', $original['path']);
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| 61 |
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| 62 | $redirect = $original;
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| 63 | $redirect_url = false;
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| 64 |
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| 65 | // Notice fixing
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| 66 | if ( !isset($redirect['path']) ) $redirect['path'] = '';
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| 67 | if ( !isset($redirect['query']) ) $redirect['query'] = '';
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| 68 |
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| 69 | if ( is_singular() && 1 > $wp_query->post_count && ($id = get_query_var('p')) ) {
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| 70 |
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| 71 | $vars = $wpdb->get_results( $wpdb->prepare("SELECT post_type, post_parent FROM $wpdb->posts WHERE ID = %d", $id) );
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| 72 |
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| 73 | if ( isset($vars[0]) && $vars = $vars[0] ) {
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| 74 | if ( 'revision' == $vars->post_type && $vars->post_parent > 0 )
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| 75 | $id = $vars->post_parent;
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| 76 |
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| 77 | if ( $redirect_url = get_permalink($id) )
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| 78 | $redirect['query'] = remove_query_arg(array('p', 'page_id', 'attachment_id'), $redirect['query']);
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| 79 | }
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| 80 | }
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| 81 |
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| 82 | // These tests give us a WP-generated permalink
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| 83 | if ( is_404() ) {
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| 84 | $redirect_url = redirect_guess_404_permalink();
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| 85 | } elseif ( is_object($wp_rewrite) && $wp_rewrite->using_permalinks() ) {
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| 86 | // rewriting of old ?p=X, ?m=2004, ?m=200401, ?m=20040101
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| 87 | if ( is_single() && !empty($_GET['p']) && ! $redirect_url ) {
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| 88 | if ( $redirect_url = get_permalink(get_query_var('p')) )
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| 89 | $redirect['query'] = remove_query_arg('p', $redirect['query']);
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| 90 | if ( get_query_var( 'page' ) ) {
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| 91 | $redirect_url = trailingslashit( $redirect_url ) . user_trailingslashit( get_query_var( 'page' ), 'single_paged' );
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| 92 | $redirect['query'] = remove_query_arg( 'page', $redirect['query'] );
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| 93 | }
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| 94 | } elseif ( is_page() && !empty($_GET['page_id']) && ! $redirect_url ) {
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| 95 | if ( $redirect_url = get_permalink(get_query_var('page_id')) )
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| 96 | $redirect['query'] = remove_query_arg('page_id', $redirect['query']);
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| 97 | } elseif ( !empty($_GET['m']) && ( is_year() || is_month() || is_day() ) ) {
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| 98 | $m = get_query_var('m');
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| 99 | switch ( strlen($m) ) {
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| 100 | case 4: // Yearly
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| 101 | $redirect_url = get_year_link($m);
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| 102 | break;
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| 103 | case 6: // Monthly
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| 104 | $redirect_url = get_month_link( substr($m, 0, 4), substr($m, 4, 2) );
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| 105 | break;
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| 106 | case 8: // Daily
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| 107 | $redirect_url = get_day_link(substr($m, 0, 4), substr($m, 4, 2), substr($m, 6, 2));
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| 108 | break;
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| 109 | }
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| 110 | if ( $redirect_url )
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| 111 | $redirect['query'] = remove_query_arg('m', $redirect['query']);
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| 112 | // now moving on to non ?m=X year/month/day links
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| 113 | } elseif ( is_day() && get_query_var('year') && get_query_var('monthnum') && !empty($_GET['day']) ) {
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| 114 | if ( $redirect_url = get_day_link(get_query_var('year'), get_query_var('monthnum'), get_query_var('day')) )
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| 115 | $redirect['query'] = remove_query_arg(array('year', 'monthnum', 'day'), $redirect['query']);
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| 116 | } elseif ( is_month() && get_query_var('year') && !empty($_GET['monthnum']) ) {
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| 117 | if ( $redirect_url = get_month_link(get_query_var('year'), get_query_var('monthnum')) )
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| 118 | $redirect['query'] = remove_query_arg(array('year', 'monthnum'), $redirect['query']);
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| 119 | } elseif ( is_year() && !empty($_GET['year']) ) {
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| 120 | if ( $redirect_url = get_year_link(get_query_var('year')) )
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| 121 | $redirect['query'] = remove_query_arg('year', $redirect['query']);
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| 122 | } elseif ( is_category() && !empty($_GET['cat']) && preg_match( '|^[0-9]+$|', $_GET['cat'] ) ) {
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| 123 | if ( $redirect_url = get_category_link(get_query_var('cat')) )
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| 124 | $redirect['query'] = remove_query_arg('cat', $redirect['query']);
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| 125 | } elseif ( is_author() && !empty($_GET['author']) ) {
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| 126 | $author = get_userdata(get_query_var('author'));
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| 127 | if ( false !== $author && $redirect_url = get_author_posts_url($author->ID, $author->user_nicename) )
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| 128 | $redirect['query'] = remove_query_arg('author', $redirect['author']);
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| 129 | }
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| 130 |
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| 131 | // paging and feeds
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| 132 | if ( get_query_var('paged') || is_feed() || get_query_var('cpage') ) {
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| 133 | if ( !$redirect_url )
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| 134 | $redirect_url = $requested_url;
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| 135 | $paged_redirect = @parse_url($redirect_url);
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| 136 | 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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| 137 | // Strip off paging and feed
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| 138 | $paged_redirect['path'] = preg_replace('#/page/[0-9]+?(/+)?$#', '/', $paged_redirect['path']); // strip off any existing paging
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| 139 | $paged_redirect['path'] = preg_replace('#/(comments/?)?(feed|rss2?|rdf|atom)(/+|$)#', '/', $paged_redirect['path']); // strip off feed endings
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| 140 | $paged_redirect['path'] = preg_replace('#/comment-page-[0-9]+?(/+)?$#', '/', $paged_redirect['path']); // strip off any existing comment paging
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| 141 | }
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| 142 |
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| 143 | $addl_path = '';
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| 144 | if ( is_feed() ) {
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| 145 | $addl_path = !empty( $addl_path ) ? trailingslashit($addl_path) : '';
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| 146 | if ( get_query_var( 'withcomments' ) )
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| 147 | $addl_path .= 'comments/';
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| 148 | $addl_path .= user_trailingslashit( 'feed/' . ( ( 'rss2' == get_query_var('feed') || 'feed' == get_query_var('feed') ) ? '' : get_query_var('feed') ), 'feed' );
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| 149 | $redirect['query'] = remove_query_arg( 'feed', $redirect['query'] );
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| 150 | }
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| 151 |
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| 152 | if ( get_query_var('paged') > 0 ) {
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| 153 | $paged = get_query_var('paged');
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| 154 | $redirect['query'] = remove_query_arg( 'paged', $redirect['query'] );
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| 155 | if ( !is_feed() ) {
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| 156 | if ( $paged > 1 && !is_single() ) {
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| 157 | $addl_path = ( !empty( $addl_path ) ? trailingslashit($addl_path) : '' ) . user_trailingslashit("page/$paged", 'paged');
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| 158 | } elseif ( !is_single() ) {
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| 159 | $addl_path = ( !empty( $addl_path ) ? trailingslashit($addl_path) : '' ) . user_trailingslashit($paged_redirect['path'], 'paged');
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| 160 | }
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| 161 | } elseif ( $paged > 1 ) {
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| 162 | $redirect['query'] = add_query_arg( 'paged', $paged, $redirect['query'] );
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| 163 | }
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| 164 | }
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| 165 |
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| 166 | 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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| 167 | $addl_path = ( !empty( $addl_path ) ? trailingslashit($addl_path) : '' ) . user_trailingslashit( 'comment-page-' . get_query_var('cpage'), 'commentpaged' );
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| 168 | $redirect['query'] = remove_query_arg( 'cpage', $redirect['query'] );
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| 169 | }
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| 170 |
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| 171 | $paged_redirect['path'] = user_trailingslashit( preg_replace('|/index.php/?$|', '/', $paged_redirect['path']) ); // strip off trailing /index.php/
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| 172 | if ( !empty( $addl_path ) && $wp_rewrite->using_index_permalinks() && strpos($paged_redirect['path'], '/index.php/') === false )
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| 173 | $paged_redirect['path'] = trailingslashit($paged_redirect['path']) . 'index.php/';
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| 174 | if ( !empty( $addl_path ) )
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| 175 | $paged_redirect['path'] = trailingslashit($paged_redirect['path']) . $addl_path;
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| 176 | $redirect_url = $paged_redirect['scheme'] . '://' . $paged_redirect['host'] . $paged_redirect['path'];
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| 177 | $redirect['path'] = $paged_redirect['path'];
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| 178 | }
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| 179 | }
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| 180 |
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| 181 | // tack on any additional query vars
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| 182 | $redirect['query'] = preg_replace( '#^\??&*?#', '', $redirect['query'] );
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| 183 | if ( $redirect_url && !empty($redirect['query']) ) {
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| 184 | if ( strpos($redirect_url, '?') !== false )
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| 185 | $redirect_url .= '&';
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| 186 | else
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| 187 | $redirect_url .= '?';
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| 188 | $redirect_url .= $redirect['query'];
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| 189 | }
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| 190 |
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| 191 | if ( $redirect_url )
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| 192 | $redirect = @parse_url($redirect_url);
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| 193 |
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| 194 | // www.example.com vs example.com
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| 195 | $user_home = @parse_url(get_option('home'));
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| 196 | if ( !empty($user_home['host']) )
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| 197 | $redirect['host'] = $user_home['host'];
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| 198 | if ( empty($user_home['path']) )
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| 199 | $user_home['path'] = '/';
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| 200 |
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| 201 | // Handle ports
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| 202 | if ( !empty($user_home['port']) )
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| 203 | $redirect['port'] = $user_home['port'];
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| 204 | else
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| 205 | unset($redirect['port']);
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| 206 |
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| 207 | // trailing /index.php
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| 208 | $redirect['path'] = preg_replace('|/index.php/*?$|', '/', $redirect['path']);
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| 209 |
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| 210 | // Remove trailing spaces from the path
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| 211 | $redirect['path'] = preg_replace( '#(%20| )+$#', '', $redirect['path'] );
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| 212 |
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| 213 | if ( !empty( $redirect['query'] ) ) {
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| 214 | // Remove trailing spaces from certain terminating query string args
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| 215 | $redirect['query'] = preg_replace( '#((p|page_id|cat|tag)=[^&]*?)(%20| )+$#', '$1', $redirect['query'] );
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| 216 |
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| 217 | // Clean up empty query strings
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| 218 | $redirect['query'] = trim(preg_replace( '#(^|&)(p|page_id|cat|tag)=?(&|$)#', '&', $redirect['query']), '&');
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| 219 |
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| 220 | // Remove redundant leading ampersands
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| 221 | $redirect['query'] = preg_replace( '#^\??&*?#', '', $redirect['query'] );
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| 222 | }
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| 223 |
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| 224 | // strip /index.php/ when we're not using PATHINFO permalinks
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| 225 | if ( !$wp_rewrite->using_index_permalinks() )
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| 226 | $redirect['path'] = str_replace('/index.php/', '/', $redirect['path']);
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| 227 |
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| 228 | // trailing slashes
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| 229 | if ( is_object($wp_rewrite) && $wp_rewrite->using_permalinks() && !is_404() && (!is_front_page() || ( is_front_page() && (get_query_var('paged') > 1) ) ) ) {
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| 230 | $user_ts_type = '';
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| 231 | if ( get_query_var('paged') > 0 ) {
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| 232 | $user_ts_type = 'paged';
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| 233 | } else {
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| 234 | foreach ( array('single', 'category', 'page', 'day', 'month', 'year', 'home') as $type ) {
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| 235 | $func = 'is_' . $type;
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| 236 | if ( call_user_func($func) ) {
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| 237 | $user_ts_type = $type;
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| 238 | break;
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| 239 | }
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| 240 | }
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| 241 | }
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| 242 | $redirect['path'] = user_trailingslashit($redirect['path'], $user_ts_type);
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| 243 | } elseif ( is_front_page() ) {
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| 244 | $redirect['path'] = trailingslashit($redirect['path']);
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| 245 | }
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| 246 |
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| 247 | // Always trailing slash the Front Page URL
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| 248 | if ( trailingslashit( $redirect['path'] ) == trailingslashit( $user_home['path'] ) )
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| 249 | $redirect['path'] = trailingslashit($redirect['path']);
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| 250 |
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| 251 | // Ignore differences in host capitalization, as this can lead to infinite redirects
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| 252 | // Only redirect no-www <=> yes-www
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| 253 | if ( strtolower($original['host']) == strtolower($redirect['host']) ||
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| 254 | ( strtolower($original['host']) != 'www.' . strtolower($redirect['host']) && 'www.' . strtolower($original['host']) != strtolower($redirect['host']) ) )
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| 255 | $redirect['host'] = $original['host'];
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| 256 |
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| 257 | $compare_original = array($original['host'], $original['path']);
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| 258 |
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| 259 | if ( !empty( $original['port'] ) )
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| 260 | $compare_original[] = $original['port'];
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| 261 |
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| 262 | if ( !empty( $original['query'] ) )
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| 263 | $compare_original[] = $original['query'];
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| 264 |
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| 265 | $compare_redirect = array($redirect['host'], $redirect['path']);
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| 266 |
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| 267 | if ( !empty( $redirect['port'] ) )
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| 268 | $compare_redirect[] = $redirect['port'];
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| 269 |
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| 270 | if ( !empty( $redirect['query'] ) )
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| 271 | $compare_redirect[] = $redirect['query'];
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| 272 |
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| 273 | if ( $compare_original !== $compare_redirect ) {
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| 274 | $redirect_url = $redirect['scheme'] . '://' . $redirect['host'];
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| 275 | if ( !empty($redirect['port']) )
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| 276 | $redirect_url .= ':' . $redirect['port'];
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| 277 | $redirect_url .= $redirect['path'];
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| 278 | if ( !empty($redirect['query']) )
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| 279 | $redirect_url .= '?' . $redirect['query'];
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| 280 | }
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| 281 |
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| 282 | if ( $redirect_url == $requested_url )
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| 283 | return false;
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| 284 |
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| 285 | // Note that you can use the "redirect_canonical" filter to cancel a canonical redirect for whatever reason by returning FALSE
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| 286 | $redirect_url = apply_filters('redirect_canonical', $redirect_url, $requested_url);
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| 287 |
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| 288 | if ( !$redirect_url || $redirect_url == $requested_url ) // yes, again -- in case the filter aborted the request
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| 289 | return false;
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| 290 |
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| 291 | if ( $do_redirect ) {
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| 292 | // protect against chained redirects
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| 293 | if ( !redirect_canonical($redirect_url, false) ) {
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| 294 | wp_redirect($redirect_url, 301);
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| 295 | exit();
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| 296 | } else {
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| 297 | // Debug
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| 298 | // die("1: $redirect_url<br />2: " . redirect_canonical( $redirect_url, false ) );
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| 299 | return false;
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| 300 | }
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| 301 | } else {
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| 302 | return $redirect_url;
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| 303 | }
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| 304 | }
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| 305 |
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| 306 | /**
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| 307 | * Attempts to guess correct post based on query vars.
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| 308 | *
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| 309 | * @since 2.3.0
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| 310 | * @uses $wpdb
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| 311 | *
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| 312 | * @return bool|string Returns False, if it can't find post, returns correct
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| 313 | * location on success.
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| 314 | */
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| 315 | function redirect_guess_404_permalink() {
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| 316 | global $wpdb;
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| 317 |
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| 318 | if ( !get_query_var('name') )
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| 319 | return false;
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| 320 |
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| 321 | $where = $wpdb->prepare("post_name LIKE %s", get_query_var('name') . '%');
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| 322 |
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| 323 | // if any of year, monthnum, or day are set, use them to refine the query
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| 324 | if ( get_query_var('year') )
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| 325 | $where .= $wpdb->prepare(" AND YEAR(post_date) = %d", get_query_var('year'));
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| 326 | if ( get_query_var('monthnum') )
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| 327 | $where .= $wpdb->prepare(" AND MONTH(post_date) = %d", get_query_var('monthnum'));
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| 328 | if ( get_query_var('day') )
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| 329 | $where .= $wpdb->prepare(" AND DAYOFMONTH(post_date) = %d", get_query_var('day'));
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| 330 |
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| 331 | $post_id = $wpdb->get_var("SELECT ID FROM $wpdb->posts WHERE $where AND post_status = 'publish'");
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| 332 | if ( !$post_id )
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| 333 | return false;
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| 334 | return get_permalink($post_id);
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| 335 | }
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| 336 |
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| 337 | add_action('template_redirect', 'redirect_canonical');
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| 338 |
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| 339 | ?>
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