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Date/Time: Ensure that `get_feed_build_date()` correctly handles a modified post object with invalid date. 

* Clarify in the documentation that the function returns `false` on failure.
* Consistently pass the return value through the `get_feed_build_date` filter.

Props Rarst, dd32, azaozz, tellyworth.
Fixes #48957.

git-svn-id: https://develop.svn.wordpress.org/trunk@46974 602fd350-edb4-49c9-b593-d223f7449a82
This commit is contained in:
Sergey Biryukov 2019-12-17 20:41:09 +00:00
parent 9d69e005ea
commit a4b65bfca8
2 changed files with 74 additions and 28 deletions
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60
src/wp-includes/feed.php
View File

@ -648,55 +648,59 @@ function self_link() {
}
/**
* Get the timestamp of the most recently modified post from WP_Query.
* Get the UTC time of the most recently modified post from WP_Query.
*
* If viewing a comment feed, the timestamp of the most recently modified
* If viewing a comment feed, the time of the most recently modified
* comment will be returned.
*
* @global WP_Query $wp_query WordPress Query object.
*
* @since 5.2.0
*
* @param string $format Format of the timestamp to return, passed to mysql2date.
*
* @return string The timestamp.
* @param string $format Date format string to return the time in.
* @return string|false The time in requested format, or false on failure.
*/
function get_feed_build_date( $format ) {
global $wp_query;
if ( empty( $wp_query ) || ! $wp_query->have_posts() ) {
// Fallback to last time any post was modified or published.
return get_lastpostmodified( 'GMT' );
$datetime = false;
$max_modified_time = false;
$utc = new DateTimeZone( 'UTC' );
if ( ! empty( $wp_query ) && $wp_query->have_posts() ) {
// Extract the post modified times from the posts.
$modified_times = wp_list_pluck( $wp_query->posts, 'post_modified_gmt' );
// If this is a comment feed, check those objects too.
if ( $wp_query->is_comment_feed() && $wp_query->comment_count ) {
// Extract the comment modified times from the comments.
$comment_times = wp_list_pluck( $wp_query->comments, 'comment_date_gmt' );
// Add the comment times to the post times for comparison.
$modified_times = array_merge( $modified_times, $comment_times );
}
// Determine the maximum modified time.
$datetime = date_create_immutable_from_format( 'Y-m-d H:i:s', max( $modified_times ), $utc );
}
// Extract the post modified times from the posts.
$modified_times = wp_list_pluck( $wp_query->posts, 'post_modified_gmt' );
// If this is a comment feed, check those objects too.
if ( $wp_query->is_comment_feed() && $wp_query->comment_count ) {
// Extract the comment modified times from the comments.
$comment_times = wp_list_pluck( $wp_query->comments, 'comment_date_gmt' );
// Add the comment times to the post times for comparison.
$modified_times = array_merge( $modified_times, $comment_times );
if ( false === $datetime ) {
// Fall back to last time any post was modified or published.
$datetime = date_create_immutable_from_format( 'Y-m-d H:i:s', get_lastpostmodified( 'GMT' ), $utc );
}
// Determine the maximum modified time.
$datetime = date_create_immutable_from_format(
'Y-m-d H:i:s',
max( $modified_times ),
new DateTimeZone( 'UTC' )
);
$max_modified_time = $datetime->format( $format );
if ( false !== $datetime ) {
$max_modified_time = $datetime->format( $format );
}
/**
* Filters the date the last post or comment in the query was modified.
*
* @since 5.2.0
*
* @param string $max_modified_time Date the last post or comment was modified in the query.
* @param string $format The date format requested in get_feed_build_date.
* @param string|false $max_modified_time Date the last post or comment was modified in the query, in UTC.
* False on failure.
* @param string $format The date format requested in get_feed_build_date().
*/
return apply_filters( 'get_feed_build_date', $max_modified_time, $format );
}

42
tests/phpunit/tests/date/getFeedBuildDate.php
View File

@ -37,4 +37,46 @@ class Tests_Date_Get_Feed_Build_Date extends WP_UnitTestCase {
$this->assertEquals( '2018-07-23T03:13:23+00:00', get_feed_build_date( DATE_RFC3339 ) );
}
/**
* Test that get_feed_build_date() works with invalid post dates.
*
* @ticket 48957
*/
public function test_should_fall_back_to_last_post_modified() {
global $wp_query;
update_option( 'timezone_string', 'Europe/Kiev' );
$datetime = new DateTimeImmutable( 'now', wp_timezone() );
$datetime_utc = $datetime->setTimezone( new DateTimeZone( 'UTC' ) );
$wp_query->posts = array();
$this->assertFalse( get_feed_build_date( DATE_RFC3339 ), 'False when unable to determine valid time' );
$this->factory->post->create(
array(
'post_date' => $datetime->format( 'Y-m-d H:i:s' ),
)
);
$this->assertEquals(
$datetime_utc->format( DATE_RFC3339 ),
get_feed_build_date( DATE_RFC3339 ),
'Fall back to time of last post modified with no posts'
);
$post_id_broken = $this->factory->post->create();
$post_broken = get_post( $post_id_broken );
$post_broken->post_modified_gmt = 0;
$wp_query->posts = array( $post_broken );
$this->assertEquals(
$datetime_utc->format( DATE_RFC3339 ),
get_feed_build_date( DATE_RFC3339 ),
'Fall back to time of last post modified with broken post object'
);
}
}