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