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Fix parsing of inner blocks when auto-generating an excerpt. Helps to prevent cases where dynamic inner blocks may cause an infinite loop if trying to auto-generate an excerpt. 

Props desrosj, pento, gziolo, azaozz.
Fixes #46133.

git-svn-id: https://develop.svn.wordpress.org/trunk@45265 602fd350-edb4-49c9-b593-d223f7449a82
This commit is contained in:
Andrew Ozz 2019-04-24 21:38:21 +00:00
parent 7b1d581339
commit 71832fe328
2 changed files with 177 additions and 3 deletions
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51
src/wp-includes/blocks.php
View File

@ -125,10 +125,9 @@ function get_dynamic_block_names() {
* @return string The parsed and filtered content.
*/
function excerpt_remove_blocks( $content ) {
$allowed_blocks = array(
$allowed_inner_blocks = array(
// Classic blocks have their blockName set to null.
null,
'core/columns',
'core/freeform',
'core/heading',
'core/html',
@ -141,6 +140,9 @@ function excerpt_remove_blocks( $content ) {
'core/table',
'core/verse',
);
$allowed_blocks = array_merge( $allowed_inner_blocks, array( 'core/columns' ) );
/**
* Filters the list of blocks that can contribute to the excerpt.
*
@ -154,12 +156,55 @@ function excerpt_remove_blocks( $content ) {
$allowed_blocks = apply_filters( 'excerpt_allowed_blocks', $allowed_blocks );
$blocks = parse_blocks( $content );
$output = '';
foreach ( $blocks as $block ) {
if ( in_array( $block['blockName'], $allowed_blocks, true ) ) {
if ( ! empty( $block['innerBlocks'] ) ) {
if ( 'core/columns' === $block['blockName'] ) {
$output .= _excerpt_render_inner_columns_blocks( $block, $allowed_inner_blocks );
continue;
}
// Skip the block if it has disallowed or nested inner blocks.
foreach ( $block['innerBlocks'] as $inner_block ) {
if (
! in_array( $inner_block['blockName'], $allowed_inner_blocks, true ) ||
! empty( $inner_block['innerBlocks'] )
) {
continue 2;
}
}
}
$output .= render_block( $block );
}
}
return $output;
return $output;
}
/**
* Render inner blocks from the `core/columns` block for generating an excerpt.
*
* @since 5.2.0
* @access private
*
* @param array $columns The parsed columns block.
* @param array $allowed_blocks The list of allowed inner blocks.
* @return string The rendered inner blocks.
*/
function _excerpt_render_inner_columns_blocks( $columns, $allowed_blocks ) {
$output = '';
foreach ( $columns['innerBlocks'] as $column ) {
foreach ( $column['innerBlocks'] as $inner_block ) {
if ( in_array( $inner_block['blockName'], $allowed_blocks, true ) && empty( $inner_block['innerBlocks'] ) ) {
$output .= render_block( $inner_block );
}
}
}
return $output;
}
/**

129
tests/phpunit/tests/formatting/ExcerptRemoveBlocks.php Normal file
View File

@ -0,0 +1,129 @@
<?php
/**
* @group formatting
* @covers ::excerpt_remove_blocks
* @ticket 46133
*/
class Tests_Formatting_ExcerptRemoveBlocks extends WP_UnitTestCase {
public static $post_id;
public $content = '
<!-- wp:paragraph -->
<p>paragraph</p>
<!-- /wp:paragraph -->
<!-- wp:latest-posts {"postsToShow":3,"displayPostDate":true,"order":"asc","orderBy":"title"} /-->
<!-- wp:spacer -->
<div style="height:100px" aria-hidden="true" class="wp-block-spacer"></div>
<!-- /wp:spacer -->
<!-- wp:columns {"columns":1} -->
<div class="wp-block-columns has-1-columns">
<!-- wp:column -->
<div class="wp-block-column">
<!-- wp:archives {"displayAsDropdown":false,"showPostCounts":false} /-->
<!-- wp:paragraph -->
<p>paragraph inside column</p>
<!-- /wp:paragraph -->
</div>
<!-- /wp:column -->
</div>
<!-- /wp:columns -->
';
public $filtered_content = '
<p>paragraph</p>
<p>paragraph inside column</p>
';
/**
* Fake block rendering function.
*
* @since 5.2.0
*
* @return string Block output.
*/
function render_fake_block() {
return get_the_excerpt( self::$post_id );
}
/**
* Set up.
*
* @since 5.2.0
*/
function setUp() {
parent::setUp();
self::$post_id = $this->factory()->post->create(
array(
'post_excerpt' => '', // Empty excerpt, so it has to be generated.
'post_content' => '<!-- wp:core/fake /-->',
)
);
register_block_type(
'core/fake',
array(
'render_callback' => array( $this, 'render_fake_block' ),
)
);
}
/**
* Tear down.
*
* @since 5.2.0
*/
function tearDown() {
parent::tearDown();
$registry = WP_Block_Type_Registry::get_instance();
$registry->unregister( 'core/fake' );
wp_delete_post( self::$post_id, true );
}
/**
* Tests excerpt_remove_blocks().
*
* @ticket 46133
*/
function test_excerpt_remove_blocks() {
// Simple dynamic block..
$content = '<!-- wp:core/block /-->';
$this->assertEmpty( excerpt_remove_blocks( $content ) );
// Dynamic block with options, embedded in other content.
$this->assertEquals( $this->filtered_content, excerpt_remove_blocks( $this->content ) );
}
/**
* Tests that dynamic blocks don't cause an out-of-memory error.
*
* When dynamic blocks happen to generate an excerpt, they can cause an
* infinite loop if that block is part of the post's content.
*
* `wp_trim_excerpt()` applies the `the_content` filter, which has
* `do_blocks` attached to it, trying to render the block which again will
* attempt to return an excerpt of that post.
*
* This infinite loop can be avoided by stripping dynamic blocks before
* `the_content` gets applied, just like shortcodes.
*
* @ticket 46133
*/
function test_excerpt_infinite_loop() {
$query = new WP_Query(
array(
'post__in' => array( self::$post_id ),
)
);
$query->the_post();
$this->assertEmpty( do_blocks( '<!-- wp:core/fake /-->' ) );
}
}