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Canonical URLs: Redirect to the correct URL when the post date changes.

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When a post slug is changed, we store a copy of the old slug, so that we can redirect visitors visiting the old URL to the new URL.

In the same way, this stores a copy of the old date, when the post date changes, so we can redirect visitors to the new URL.

Props nickmomrik.
Fixes #15397 for trunk.



git-svn-id: https://develop.svn.wordpress.org/trunk@42401 602fd350-edb4-49c9-b593-d223f7449a82
This commit is contained in:
Gary Pendergast
2017-12-15 08:30:50 +00:00
parent 95ccede93d
commit c07972d774
4 changed files with 349 additions and 16 deletions
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103
src/wp-includes/query.php
View File

@@ -845,13 +845,9 @@ function the_comment() {
* Attempts to find the current slug from the past slugs.
*
* @since 2.1.0
*
* @global wpdb $wpdb WordPress database abstraction object.
*/
function wp_old_slug_redirect() {
if ( is_404() && '' !== get_query_var( 'name' ) ) {
global $wpdb;
// Guess the current post_type based on the query vars.
if ( get_query_var( 'post_type' ) ) {
$post_type = get_query_var( 'post_type' );
@@ -875,21 +871,20 @@ function wp_old_slug_redirect() {
return;
}
$query = $wpdb->prepare( "SELECT post_id FROM $wpdb->postmeta, $wpdb->posts WHERE ID = post_id AND post_type = %s AND meta_key = '_wp_old_slug' AND meta_value = %s", $post_type, get_query_var( 'name' ) );
$id = _find_post_by_old_slug( $post_type );
// if year, monthnum, or day have been specified, make our query more precise
// just in case there are multiple identical _wp_old_slug values
if ( get_query_var( 'year' ) ) {
$query .= $wpdb->prepare( ' AND YEAR(post_date) = %d', get_query_var( 'year' ) );
}
if ( get_query_var( 'monthnum' ) ) {
$query .= $wpdb->prepare( ' AND MONTH(post_date) = %d', get_query_var( 'monthnum' ) );
}
if ( get_query_var( 'day' ) ) {
$query .= $wpdb->prepare( ' AND DAYOFMONTH(post_date) = %d', get_query_var( 'day' ) );
if ( ! $id ) {
$id = _find_post_by_old_date( $post_type );
}
$id = (int) $wpdb->get_var( $query );
/**
* Filters the old slug redirect post ID.
*
* @since 4.9.2
*
* @param string $id The redirect post ID.
*/
$id = apply_filters( 'old_slug_redirect_post_id', $id );
if ( ! $id ) {
return;
@@ -921,6 +916,82 @@ function wp_old_slug_redirect() {
}
}
/**
* Find the post ID for redirecting an old slug.
*
* @see wp_old_slug_redirect()
*
* @since 4.9.2
* @access private
*
* @global wpdb $wpdb WordPress database abstraction object.
*
* @param string $post_type The current post type based on the query vars.
* @return int $id The Post ID.
*/
function _find_post_by_old_slug( $post_type ) {
global $wpdb;
$query = $wpdb->prepare( "SELECT post_id FROM $wpdb->postmeta, $wpdb->posts WHERE ID = post_id AND post_type = %s AND meta_key = '_wp_old_slug' AND meta_value = %s", $post_type, get_query_var( 'name' ) );
// if year, monthnum, or day have been specified, make our query more precise
// just in case there are multiple identical _wp_old_slug values
if ( get_query_var( 'year' ) ) {
$query .= $wpdb->prepare( " AND YEAR(post_date) = %d", get_query_var( 'year' ) );
}
if ( get_query_var( 'monthnum' ) ) {
$query .= $wpdb->prepare( " AND MONTH(post_date) = %d", get_query_var( 'monthnum' ) );
}
if ( get_query_var( 'day' ) ) {
$query .= $wpdb->prepare( " AND DAYOFMONTH(post_date) = %d", get_query_var( 'day' ) );
}
$id = (int) $wpdb->get_var( $query );
return $id;
}
/**
* Find the post ID for redirecting an old date.
*
* @see wp_old_slug_redirect()
*
* @since 4.9.2
* @access private
*
* @global wpdb $wpdb WordPress database abstraction object.
*
* @param string $post_type The current post type based on the query vars.
* @return int $id The Post ID.
*/
function _find_post_by_old_date( $post_type ) {
global $wpdb;
$date_query = '';
if ( get_query_var( 'year' ) ) {
$date_query .= $wpdb->prepare( " AND YEAR(pm_date.meta_value) = %d", get_query_var( 'year' ) );
}
if ( get_query_var( 'monthnum' ) ) {
$date_query .= $wpdb->prepare( " AND MONTH(pm_date.meta_value) = %d", get_query_var( 'monthnum' ) );
}
if ( get_query_var( 'day' ) ) {
$date_query .= $wpdb->prepare( " AND DAYOFMONTH(pm_date.meta_value) = %d", get_query_var( 'day' ) );
}
$id = 0;
if ( $date_query ) {
$id = (int) $wpdb->get_var( $wpdb->prepare( "SELECT post_id FROM $wpdb->postmeta AS pm_date, $wpdb->posts WHERE ID = post_id AND post_type = %s AND meta_key = '_wp_old_date' AND post_name = %s" . $date_query, $post_type, get_query_var( 'name' ) ) );
if ( ! $id ) {
// Check to see if an old slug matches the old date
$id = (int) $wpdb->get_var( $wpdb->prepare( "SELECT ID FROM $wpdb->posts, $wpdb->postmeta AS pm_slug, $wpdb->postmeta AS pm_date WHERE ID = pm_slug.post_id AND ID = pm_date.post_id AND post_type = %s AND pm_slug.meta_key = '_wp_old_slug' AND pm_slug.meta_value = %s AND pm_date.meta_key = '_wp_old_date'" . $date_query, $post_type, get_query_var( 'name' ) ) );
}
}
return $id;
}
/**
* Set up global post data.
*