Wordpress 3.5
[autoinstalls/wordpress.git] / wp-includes / canonical.php
index 453641a2b777514c1bd06332e2e0b8522afd53d0..7cd12564f73e3e954b600161cf62e7dcc1007d28 100644 (file)
  *
  * 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
+ * prevents penalty 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.
+ * admin URLs. Does not redirect on non-pretty-permalink-supporting IIS 7,
+ * page/post previews, WP admin, Trackbacks, robots.txt, searches, or on POST
+ * requests.
  *
  * 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
@@ -37,7 +39,7 @@
 function redirect_canonical( $requested_url = null, $do_redirect = true ) {
        global $wp_rewrite, $is_IIS, $wp_query, $wpdb;
 
-       if ( is_trackback() || is_search() || is_comments_popup() || is_admin() || !empty($_POST) || is_preview() || is_robots() || $is_IIS )
+       if ( is_trackback() || is_search() || is_comments_popup() || is_admin() || !empty($_POST) || is_preview() || is_robots() || ( $is_IIS && !iis7_supports_permalinks() ) )
                return;
 
        if ( !$requested_url ) {
@@ -66,6 +68,13 @@ function redirect_canonical( $requested_url = null, $do_redirect = true ) {
        if ( !isset($redirect['query']) )
                $redirect['query'] = '';
 
+       if ( is_feed() && ( $id = get_query_var( 'p' ) ) ) {
+               if ( $redirect_url = get_post_comments_feed_link( $id, get_query_var( 'feed' ) ) ) {
+                       $redirect['query'] = _remove_qs_args_if_not_in_url( $redirect['query'], array( 'p', 'page_id', 'attachment_id', 'pagename', 'name', 'post_type', 'feed'), $redirect_url );
+                       $redirect['path'] = parse_url( $redirect_url, PHP_URL_PATH );
+               }
+       }
+
        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) );
@@ -75,7 +84,7 @@ function redirect_canonical( $requested_url = null, $do_redirect = true ) {
                                $id = $vars->post_parent;
 
                        if ( $redirect_url = get_permalink($id) )
-                               $redirect['query'] = remove_query_arg(array('p', 'page_id', 'attachment_id', 'post_type'), $redirect['query']);
+                               $redirect['query'] = _remove_qs_args_if_not_in_url( $redirect['query'], array( 'p', 'page_id', 'attachment_id', 'pagename', 'name', 'post_type' ), $redirect_url );
                }
        }
 
@@ -88,12 +97,15 @@ function redirect_canonical( $requested_url = null, $do_redirect = true ) {
                        $post_type_obj = get_post_type_object($redirect_post->post_type);
                        if ( $post_type_obj->public ) {
                                $redirect_url = get_permalink($redirect_post);
-                               $redirect['query'] = remove_query_arg(array('p', 'page_id', 'attachment_id', 'post_type'), $redirect['query']);
+                               $redirect['query'] = _remove_qs_args_if_not_in_url( $redirect['query'], array( 'p', 'page_id', 'attachment_id', 'pagename', 'name', 'post_type' ), $redirect_url );
                        }
                }
 
-               if ( ! $redirect_url )
-                       $redirect_url = redirect_guess_404_permalink();
+               if ( ! $redirect_url ) {
+                       if ( $redirect_url = redirect_guess_404_permalink() ) {
+                               $redirect['query'] = _remove_qs_args_if_not_in_url( $redirect['query'], array( 'page', 'feed', 'p', 'page_id', 'attachment_id', 'pagename', 'name', 'post_type' ), $redirect_url );
+                       }
+               }
 
        } elseif ( is_object($wp_rewrite) && $wp_rewrite->using_permalinks() ) {
                // rewriting of old ?p=X, ?m=2004, ?m=200401, ?m=20040101
@@ -175,10 +187,10 @@ function redirect_canonical( $requested_url = null, $do_redirect = true ) {
 
                                                // Create the destination url for this taxonomy
                                                $tax_url = parse_url($tax_url);
-                                               if ( ! empty($tax_url['query']) ) { // Taxonomy accessable via ?taxonomy=..&term=.. or any custom qv..
+                                               if ( ! empty($tax_url['query']) ) { // Taxonomy accessible via ?taxonomy=..&term=.. or any custom qv..
                                                        parse_str($tax_url['query'], $query_vars);
                                                        $redirect['query'] = add_query_arg($query_vars, $redirect['query']);
-                                               } else { // Taxonomy is accessable via a "pretty-URL"
+                                               } else { // Taxonomy is accessible via a "pretty-URL"
                                                        $redirect['path'] = $tax_url['path'];
                                                }
 
@@ -191,15 +203,17 @@ function redirect_canonical( $requested_url = null, $do_redirect = true ) {
                                }
 
                        }
-               } elseif ( is_single() && strpos($wp_rewrite->permalink_structure, '%category%') !== false ) {
-                       $category = get_category_by_path(get_query_var('category_name'));
+               } elseif ( is_single() && strpos($wp_rewrite->permalink_structure, '%category%') !== false && $cat = get_query_var( 'category_name' ) ) {
+                       $category = get_category_by_path( $cat );
                        $post_terms = wp_get_object_terms($wp_query->get_queried_object_id(), 'category', array('fields' => 'tt_ids'));
                        if ( (!$category || is_wp_error($category)) || ( !is_wp_error($post_terms) && !empty($post_terms) && !in_array($category->term_taxonomy_id, $post_terms) ) )
                                $redirect_url = get_permalink($wp_query->get_queried_object_id());
                }
 
                // Post Paging
-               if ( is_singular() && get_query_var('page') && $redirect_url ) {
+               if ( is_singular() && ! is_front_page() && get_query_var('page') ) {
+                       if ( !$redirect_url )
+                               $redirect_url = get_permalink( get_queried_object_id() );
                        $redirect_url = trailingslashit( $redirect_url ) . user_trailingslashit( get_query_var( 'page' ), 'single_paged' );
                        $redirect['query'] = remove_query_arg( 'page', $redirect['query'] );
                }
@@ -216,10 +230,27 @@ function redirect_canonical( $requested_url = null, $do_redirect = true ) {
                        $addl_path = '';
                        if ( is_feed() && in_array( get_query_var('feed'), $wp_rewrite->feeds ) ) {
                                $addl_path = !empty( $addl_path ) ? trailingslashit($addl_path) : '';
-                               if ( get_query_var( 'withcomments' ) )
+                               if ( !is_singular() && get_query_var( 'withcomments' ) )
                                        $addl_path .= 'comments/';
-                               $addl_path .= user_trailingslashit( 'feed/' . ( ( get_default_feed() ==  get_query_var('feed') || 'feed' == get_query_var('feed') ) ? '' : get_query_var('feed') ), 'feed' );
+                               if ( ( 'rss' == get_default_feed() && 'feed' == get_query_var('feed') ) || 'rss' == get_query_var('feed') )
+                                       $addl_path .= user_trailingslashit( 'feed/' . ( ( get_default_feed() == 'rss2' ) ? '' : 'rss2' ), 'feed' );
+                               else
+                                       $addl_path .= user_trailingslashit( 'feed/' . ( ( get_default_feed() ==  get_query_var('feed') || 'feed' == get_query_var('feed') ) ? '' : get_query_var('feed') ), 'feed' );
                                $redirect['query'] = remove_query_arg( 'feed', $redirect['query'] );
+                       } elseif ( is_feed() && 'old' == get_query_var('feed') ) {
+                               $old_feed_files = array(
+                                       'wp-atom.php'         => 'atom',
+                                       'wp-commentsrss2.php' => 'comments_rss2',
+                                       'wp-feed.php'         => get_default_feed(),
+                                       'wp-rdf.php'          => 'rdf',
+                                       'wp-rss.php'          => 'rss2',
+                                       'wp-rss2.php'         => 'rss2',
+                               );
+                               if ( isset( $old_feed_files[ basename( $redirect['path'] ) ] ) ) {
+                                       $redirect_url = get_feed_link( $old_feed_files[ basename( $redirect['path'] ) ] );
+                                       wp_redirect( $redirect_url, 301 );
+                                       die();
+                               }
                        }
 
                        if ( get_query_var('paged') > 0 ) {
@@ -248,6 +279,15 @@ function redirect_canonical( $requested_url = null, $do_redirect = true ) {
                                $redirect['path'] = trailingslashit($redirect['path']) . $addl_path;
                        $redirect_url = $redirect['scheme'] . '://' . $redirect['host'] . $redirect['path'];
                }
+
+               if ( 'wp-register.php' == basename( $redirect['path'] ) ) {
+                       if ( is_multisite() )
+                               $redirect_url = apply_filters( 'wp_signup_location', network_site_url( 'wp-signup.php' ) );
+                       else
+                               $redirect_url = site_url( 'wp-login.php?action=register' );
+                       wp_redirect( $redirect_url, 301 );
+                       die();
+               }
        }
 
        // tack on any additional query vars
@@ -263,6 +303,7 @@ function redirect_canonical( $requested_url = null, $do_redirect = true ) {
                                unset( $_parsed_query['name'] );
                }
 
+               $_parsed_query = rawurlencode_deep( $_parsed_query );
                $redirect_url = add_query_arg( $_parsed_query, $redirect_url );
        }
 
@@ -295,6 +336,9 @@ function redirect_canonical( $requested_url = null, $do_redirect = true ) {
                // Clean up empty query strings
                $redirect['query'] = trim(preg_replace( '#(^|&)(p|page_id|cat|tag)=?(&|$)#', '&', $redirect['query']), '&');
 
+               // Redirect obsolete feeds
+               $redirect['query'] = preg_replace( '#(^|&)feed=rss(&|$)#', '$1feed=rss2$3', $redirect['query'] );
+
                // Remove redundant leading ampersands
                $redirect['query'] = preg_replace( '#^\??&*?#', '', $redirect['query'] );
        }
@@ -374,7 +418,7 @@ function redirect_canonical( $requested_url = null, $do_redirect = true ) {
                $requested_url = preg_replace_callback('|%[a-fA-F0-9][a-fA-F0-9]|', 'lowercase_octets', $requested_url);
        }
 
-       // Note that you can use the "redirect_canonical" filter to cancel a canonical redirect for whatever reason by returning 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
@@ -396,38 +440,97 @@ function redirect_canonical( $requested_url = null, $do_redirect = true ) {
 }
 
 /**
- * Attempts to guess correct post based on query vars.
+ * Removes arguments from a query string if they are not present in a URL
+ * DO NOT use this in plugin code.
+ *
+ * @since 3.4
+ * @access private
+ *
+ * @return string The altered query string
+ */
+function _remove_qs_args_if_not_in_url( $query_string, Array $args_to_check, $url ) {
+       $parsed_url = @parse_url( $url );
+       if ( ! empty( $parsed_url['query'] ) ) {
+               parse_str( $parsed_url['query'], $parsed_query );
+               foreach ( $args_to_check as $qv ) {
+                       if ( !isset( $parsed_query[$qv] ) )
+                               $query_string = remove_query_arg( $qv, $query_string );
+               }
+       } else {
+               $query_string = remove_query_arg( $args_to_check, $query_string );
+       }
+       return $query_string;
+}
+
+/**
+ * Attempts to guess the correct URL 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.
+ * @return bool|string The correct URL if one is found. False on failure.
  */
 function redirect_guess_404_permalink() {
-       global $wpdb;
+       global $wpdb, $wp_rewrite;
+
+       if ( get_query_var('name') ) {
+               $where = $wpdb->prepare("post_name LIKE %s", like_escape( get_query_var('name') ) . '%');
+
+               // if any of post_type, year, monthnum, or day are set, use them to refine the query
+               if ( get_query_var('post_type') )
+                       $where .= $wpdb->prepare(" AND post_type = %s", get_query_var('post_type'));
+               else
+                       $where .= " AND post_type IN ('" . implode( "', '", get_post_types( array( 'public' => true ) ) ) . "')";
+
+               if ( get_query_var('year') )
+                       $where .= $wpdb->prepare(" AND YEAR(post_date) = %d", get_query_var('year'));
+               if ( get_query_var('monthnum') )
+                       $where .= $wpdb->prepare(" AND MONTH(post_date) = %d", get_query_var('monthnum'));
+               if ( 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 )
+                       return false;
+               if ( get_query_var( 'feed' ) )
+                       return get_post_comments_feed_link( $post_id, get_query_var( 'feed' ) );
+               elseif ( get_query_var( 'page' ) )
+                       return trailingslashit( get_permalink( $post_id ) ) . user_trailingslashit( get_query_var( 'page' ), 'single_paged' );
+               else
+                       return get_permalink( $post_id );
+       }
 
-       if ( !get_query_var('name') )
-               return false;
+       return false;
+}
 
-       $where = $wpdb->prepare("post_name LIKE %s", like_escape( get_query_var('name') ) . '%');
+add_action('template_redirect', 'redirect_canonical');
 
-       // if any of post_type, year, monthnum, or day are set, use them to refine the query
-       if ( get_query_var('post_type') )
-               $where .= $wpdb->prepare(" AND post_type = %s", get_query_var('post_type'));
-       if ( get_query_var('year') )
-               $where .= $wpdb->prepare(" AND YEAR(post_date) = %d", get_query_var('year'));
-       if ( get_query_var('monthnum') )
-               $where .= $wpdb->prepare(" AND MONTH(post_date) = %d", get_query_var('monthnum'));
-       if ( get_query_var('day') )
-               $where .= $wpdb->prepare(" AND DAYOFMONTH(post_date) = %d", get_query_var('day'));
+function wp_redirect_admin_locations() {
+       global $wp_rewrite;
+       if ( ! ( is_404() && $wp_rewrite->using_permalinks() ) )
+               return;
 
-       $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);
-}
+       $admins = array(
+               home_url( 'wp-admin', 'relative' ),
+               home_url( 'dashboard', 'relative' ),
+               home_url( 'admin', 'relative' ),
+               site_url( 'dashboard', 'relative' ),
+               site_url( 'admin', 'relative' ),
+       );
+       if ( in_array( untrailingslashit( $_SERVER['REQUEST_URI'] ), $admins ) ) {
+               wp_redirect( admin_url() );
+               exit;
+       }
 
-add_action('template_redirect', 'redirect_canonical');
+       $logins = array(
+               home_url( 'wp-login.php', 'relative' ),
+               home_url( 'login', 'relative' ),
+               site_url( 'login', 'relative' ),
+       );
+       if ( in_array( untrailingslashit( $_SERVER['REQUEST_URI'] ), $logins ) ) {
+               wp_redirect( site_url( 'wp-login.php', 'login' ) );
+               exit;
+       }
+}
 
-?>
+add_action( 'template_redirect', 'wp_redirect_admin_locations', 1000 );