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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.

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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
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@@ -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;
}
/**