diff options
Diffstat (limited to 'wp-includes/canonical.php')
| -rw-r--r-- | wp-includes/canonical.php | 201 |
1 files changed, 201 insertions, 0 deletions
diff --git a/wp-includes/canonical.php b/wp-includes/canonical.php new file mode 100644 index 0000000..8027a1c --- /dev/null +++ b/wp-includes/canonical.php @@ -0,0 +1,201 @@ +<?php +// Based on "Permalink Redirect" from Scott Yang and "Enforce www. Preference" by Mark Jaquith + +function redirect_canonical($requested_url=NULL, $do_redirect=true) { + global $wp_rewrite, $posts, $is_IIS; + + if ( is_feed() || is_trackback() || is_search() || is_comments_popup() || is_admin() || $is_IIS || ( isset($_POST) && count($_POST) ) ) + return; + + if ( !$requested_url ) { + // build the URL in the address bar + $requested_url = ( isset($_SERVER['HTTPS'] ) && strtolower($_SERVER['HTTPS']) == 'on' ) ? 'https://' : 'http://'; + $requested_url .= $_SERVER['HTTP_HOST']; + $requested_url .= $_SERVER['REQUEST_URI']; + } + + $original = @parse_url($requested_url); + if ( false === $original ) + return; + + // Some PHP setups turn requests for / into /index.php in REQUEST_URI + $original['path'] = preg_replace('|/index\.php$|', '/', $original['path']); + + $redirect = $original; + $redirect_url = false; + + // These tests give us a WP-generated permalink + if ( is_404() ) { + $redirect_url = redirect_guess_404_permalink(); + } elseif ( is_object($wp_rewrite) && $wp_rewrite->using_permalinks() ) { + // rewriting of old ?p=X, ?m=2004, ?m=200401, ?m=20040101 + if ( is_single() && isset($_GET['p']) ) { + if ( $redirect_url = get_permalink(get_query_var('p')) ) + $redirect['query'] = remove_query_arg('p', $redirect['query']); + } elseif ( is_page() && isset($_GET['page_id']) ) { + if ( $redirect_url = get_permalink(get_query_var('page_id')) ) + $redirect['query'] = remove_query_arg('page_id', $redirect['query']); + } elseif ( isset($_GET['m']) && ( is_year() || is_month() || is_day() ) ) { + $m = get_query_var('m'); + switch ( strlen($m) ) { + case 4: // Yearly + $redirect_url = get_year_link($m); + break; + case 6: // Monthly + $redirect_url = get_month_link( substr($m, 0, 4), substr($m, 4, 2) ); + break; + case 8: // Daily + $redirect_url = get_day_link(substr($m, 0, 4), substr($m, 4, 2), substr($m, 6, 2)); + break; + } + if ( $redirect_url ) + $redirect['query'] = remove_query_arg('m', $redirect['query']); + // now moving on to non ?m=X year/month/day links + } elseif ( is_day() && get_query_var('year') && get_query_var('monthnum') && isset($_GET['day']) ) { + if ( $redirect_url = get_day_link(get_query_var('year'), get_query_var('monthnum'), get_query_var('day')) ) + $redirect['query'] = remove_query_arg(array('year', 'monthnum', 'day'), $redirect['query']); + } elseif ( is_month() && get_query_var('year') && isset($_GET['monthnum']) ) { + if ( $redirect_url = get_month_link(get_query_var('year'), get_query_var('monthnum')) ) + $redirect['query'] = remove_query_arg(array('year', 'monthnum'), $redirect['query']); + } elseif ( is_year() && isset($_GET['year']) ) { + if ( $redirect_url = get_year_link(get_query_var('year')) ) + $redirect['query'] = remove_query_arg('year', $redirect['query']); + } elseif ( is_category() && isset($_GET['cat']) ) { + if ( $redirect_url = get_category_link(get_query_var('cat')) ) + $redirect['query'] = remove_query_arg('cat', $redirect['query']); + } elseif ( is_author() && isset($_GET['author']) ) { + $author = get_userdata(get_query_var('author')); + if ( false !== $author && $redirect_url = get_author_link(false, $author->ID, $author->user_nicename) ) + $redirect['query'] = remove_query_arg('author', $redirect['author']); + } + + // paging + if ( $paged = get_query_var('paged') ) { + if ( $paged > 0 ) { + if ( !$redirect_url ) + $redirect_url = $requested_url; + $paged_redirect = @parse_url($redirect_url); + $paged_redirect['path'] = preg_replace('|/page/[0-9]+?(/+)?$|', '/', $paged_redirect['path']); // strip off any existing paging + $paged_redirect['path'] = preg_replace('|/index.php/?$|', '/', $paged_redirect['path']); // strip off trailing /index.php/ + if ( $paged > 1 && !is_single() ) { + $paged_redirect['path'] = trailingslashit($paged_redirect['path']); + if ( $wp_rewrite->using_index_permalinks() && strpos($paged_redirect['path'], '/index.php/') === false ) + $paged_redirect['path'] .= 'index.php/'; + $paged_redirect['path'] .= user_trailingslashit("page/$paged", 'paged'); + } elseif ( !is_home() && !is_single() ){ + $paged_redirect['path'] = user_trailingslashit($paged_redirect['path'], 'paged'); + } + $redirect_url = $paged_redirect['scheme'] . '://' . $paged_redirect['host'] . $paged_redirect['path']; + $redirect['path'] = $paged_redirect['path']; + } + $redirect['query'] = remove_query_arg('paged', $redirect['query']); + } + } + + // tack on any additional query vars + if ( $redirect_url && $redirect['query'] ) { + if ( strpos($redirect_url, '?') !== false ) + $redirect_url .= '&'; + else + $redirect_url .= '?'; + $redirect_url .= $redirect['query']; + } + + if ( $redirect_url ) + $redirect = @parse_url($redirect_url); + + // www.example.com vs example.com + $user_home = @parse_url(get_option('home')); + $redirect['host'] = $user_home['host']; + + // Handle ports + if ( isset($user_home['port']) ) + $redirect['port'] = $user_home['port']; + else + unset($redirect['port']); + + // trailing /index.php/ + $redirect['path'] = preg_replace('|/index.php/$|', '/', $redirect['path']); + + // strip /index.php/ when we're not using PATHINFO permalinks + if ( !$wp_rewrite->using_index_permalinks() ) + $redirect['path'] = str_replace('/index.php/', '/', $redirect['path']); + + // trailing slashes + if ( is_object($wp_rewrite) && $wp_rewrite->using_permalinks() && !is_404() && (!is_home() || ( is_home() && (get_query_var('paged') > 1) ) ) ) { + $user_ts_type = ''; + if ( get_query_var('paged') > 0 ) { + $user_ts_type = 'paged'; + } else { + foreach ( array('single', 'category', 'page', 'day', 'month', 'year') as $type ) { + $func = 'is_' . $type; + if ( call_user_func($func) ) + $user_ts_type = $type; + break; + } + } + $redirect['path'] = user_trailingslashit($redirect['path'], $user_ts_type); + } elseif ( is_home() ) { + $redirect['path'] = trailingslashit($redirect['path']); + } + + // Always trailing slash the 'home' URL + if ( $redirect['path'] == $user_home['path'] ) + $redirect['path'] = trailingslashit($redirect['path']); + + // Ignore differences in host capitalization, as this can lead to infinite redirects + if ( strtolower($original['host']) == strtolower($redirect['host']) ) + $redirect['host'] = $original['host']; + + if ( array($original['host'], $original['port'], $original['path'], $original['query']) !== array($redirect['host'], $redirect['port'], $redirect['path'], $redirect['query']) ) { + $redirect_url = $redirect['scheme'] . '://' . $redirect['host']; + if ( isset($redirect['port']) ) + $redirect_url .= ':' . $redirect['port']; + $redirect_url .= $redirect['path']; + if ( $redirect['query'] ) + $redirect_url .= '?' . $redirect['query']; + } + + if ( $redirect_url && $redirect_url != $requested_url ) { + // var_dump($redirect_url); die(); + $redirect_url = apply_filters('redirect_canonical', $redirect_url, $requested_url); + if ( $do_redirect) { + // protect against chained redirects + if ( !redirect_canonical($redirect_url, false) ) { + wp_redirect($redirect_url, 301); + exit(); + } else { + return false; + } + } else { + return $redirect_url; + } + } else { + return false; + } +} + +function redirect_guess_404_permalink() { + global $wp_query, $wpdb; + if ( !get_query_var('name') ) + return false; + + $where = "post_name LIKE '" . $wpdb->escape(get_query_var('name')) . "%'"; + + // if any of year, monthnum, or day are set, use them to refine the query + if ( get_query_var('year') ) + $where .= " AND YEAR(post_date) = '" . $wpdb->escape(get_query_var('year')) . "'"; + if ( get_query_var('monthnum') ) + $where .= " AND MONTH(post_date) = '" . $wpdb->escape(get_query_var('monthnum')) . "'"; + if ( get_query_var('day') ) + $where .= " AND DAYOFMONTH(post_date) = '" . $wpdb->escape(get_query_var('day')) . "'"; + + $post_id = $wpdb->get_var("SELECT ID FROM $wpdb->posts WHERE $where AND post_status = 'publish'"); + if ( !$post_id ) + return false; + return get_permalink($post_id); +} + +add_action('template_redirect', 'redirect_canonical'); + +?>
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