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Canonical: Redirect paged requests for a static page assigned as the "Posts page". 

This avoids displaying duplicate content of the home page under different URLs with appended page numbers.

This change only affects the `<!--nextpage-->` pagination (`page` query variable) and not the regular multiple posts pagination (`paged` query variable).

The posts page does not support the `<!--nextpage-->` pagination, so requests for invalid page numbers should be redirected to the page permalink, applying the logic previously implemented for single posts or pages.

Follow-up to [34492], [47727].

Props jeremyfelt, sachit.tandukar, SergeyBiryukov.
Fixes #45337. See #40773, #28081, #11694.

git-svn-id: https://develop.svn.wordpress.org/trunk@47760 602fd350-edb4-49c9-b593-d223f7449a82
This commit is contained in:
Sergey Biryukov 2020-05-04 10:40:06 +00:00
parent 54c8470bd6
commit de14ea86bf
4 changed files with 41 additions and 20 deletions
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24
src/wp-includes/canonical.php
View File

@ -186,6 +186,22 @@ function redirect_canonical( $requested_url = null, $do_redirect = true ) {
);
}
// Strip off non-existing <!--nextpage--> links from single posts or pages.
if ( get_query_var( 'page' ) ) {
$post_id = 0;
if ( $wp_query->queried_object instanceof WP_Post ) {
$post_id = $wp_query->queried_object->ID;
} elseif ( $wp_query->post ) {
$post_id = $wp_query->post->ID;
}
$redirect_url = get_permalink( $post_id );
$redirect['path'] = rtrim( $redirect['path'], (int) get_query_var( 'page' ) . '/' );
$redirect['query'] = remove_query_arg( 'page', $redirect['query'] );
}
if ( ! $redirect_url ) {
$redirect_url = redirect_guess_404_permalink();
@ -197,14 +213,6 @@ function redirect_canonical( $requested_url = null, $do_redirect = true ) {
);
}
}
// Strip off non-existing page links from single posts or pages.
if ( get_query_var( 'page' ) && $wp_query->post ) {
$redirect['path'] = rtrim( $redirect['path'], (int) get_query_var( 'page' ) . '/' );
$redirect['query'] = remove_query_arg( 'page', $redirect['query'] );
$redirect_url = get_permalink( $wp_query->post->ID );
}
} elseif ( is_object( $wp_rewrite ) && $wp_rewrite->using_permalinks() ) {
// Rewriting of old ?p=X, ?m=2004, ?m=200401, ?m=20040101.

21
src/wp-includes/class-wp.php
View File

@ -670,15 +670,15 @@ class WP {
} elseif ( $wp_query->posts ) {
$content_found = true;
$post = isset( $wp_query->post ) ? $wp_query->post : null;
// Only set X-Pingback for single posts that allow pings.
if ( is_singular() && $post && pings_open( $post ) && ! headers_sent() ) {
header( 'X-Pingback: ' . get_bloginfo( 'pingback_url', 'display' ) );
}
// Check for paged content that exceeds the max number of pages.
if ( is_singular() ) {
$post = isset( $wp_query->post ) ? $wp_query->post : null;
// Only set X-Pingback for single posts that allow pings.
if ( $post && pings_open( $post ) && ! headers_sent() ) {
header( 'X-Pingback: ' . get_bloginfo( 'pingback_url', 'display' ) );
}
// Check for paged content that exceeds the max number of pages.
$next = '<!--nextpage-->';
if ( $post && ! empty( $this->query_vars['page'] ) ) {
// Check if content is actually intended to be paged.
@ -691,6 +691,11 @@ class WP {
}
}
// The posts page does not support the <!--nextpage--> pagination.
if ( $wp_query->is_posts_page && ! empty( $this->query_vars['page'] ) ) {
$content_found = false;
}
if ( $content_found ) {
$set_404 = false;
}

5
tests/phpunit/tests/canonical/pageOnFront.php
View File

@ -58,8 +58,13 @@ class Tests_Canonical_PageOnFront extends WP_Canonical_UnitTestCase {
// The page designated as the front page should redirect to the front of the site.
array( '/front-page/', '/' ),
// The front page supports the <!--nextpage--> pagination.
array( '/front-page/2/', '/page/2/' ),
array( '/front-page/?page=2', '/page/2/' ),
// The posts page does not support the <!--nextpage--> pagination.
array( '/blog-page/2/', '/blog-page/' ),
array( '/blog-page/?page=2', '/blog-page/' ),
// The posts page supports regular pagination.
array( '/blog-page/?paged=2', '/blog-page/page/2/' ),
);
}

11
tests/phpunit/tests/canonical/paged.php
View File

@ -6,7 +6,7 @@
*/
class Tests_Canonical_Paged extends WP_Canonical_UnitTestCase {
function test_nextpage() {
function test_redirect_canonical_with_nextpage_pagination() {
$para = 'This is a paragraph.
This is a paragraph.
This is a paragraph.';
@ -19,9 +19,12 @@ class Tests_Canonical_Paged extends WP_Canonical_UnitTestCase {
)
);
$link = parse_url( get_permalink( $post_id ), PHP_URL_PATH );
$paged = $link . '4/';
$link = parse_url( get_permalink( $post_id ), PHP_URL_PATH );
$this->assertCanonical( $paged, $link );
// Existing page should be displayed as is.
$this->assertCanonical( $link . '3/', $link . '3/' );
// Non-existing page should redirect to the permalink.
$this->assertCanonical( $link . '4/', $link );
}
}