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Prevent circular references in navigation block rendering (#46387)
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* Revert "Handle innerContent too when removing innerBlocks (#46377)"

This reverts commit 181b383.

* Revert "Add social link singular to list of blocks to be allowed (#46374)"

This reverts commit 394590b.

* Revert "Recursively remove Navigation block’s from appearing inside Navigation block on front of site (#46279)"

This reverts commit afc8b42.

* Refactor ul code for readability

* Refactor li wrapper conditional

* Prevent rendering nav refs that have already been seen

* Fix PHP lint
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Alex Lende authored Dec 8, 2022
1 parent 5c44574 commit 116ba2f
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Showing 2 changed files with 42 additions and 48 deletions.
1 change: 0 additions & 1 deletion packages/block-library/src/navigation/edit/inner-blocks.js
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Original file line number Diff line number Diff line change
Expand Up @@ -15,7 +15,6 @@ import { useMemo } from '@wordpress/element';
*/
import PlaceholderPreview from './placeholder/placeholder-preview';

// This list is duplicated in packages/block-library/src/navigation/index.php
const ALLOWED_BLOCKS = [
'core/navigation-link',
'core/search',
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89 changes: 42 additions & 47 deletions packages/block-library/src/navigation/index.php
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Original file line number Diff line number Diff line change
Expand Up @@ -390,49 +390,20 @@ function block_core_navigation_get_most_recently_published_navigation() {
}

/**
* Recursively filter out blocks from the block list that are not whitelisted.
* This list of exclusions includes:
* - The Navigation block itself (results in recursion).
* - empty "null" blocks from the block list.
* - other blocks that are not yet handled.
*
* Note: 'parse_blocks' includes a null block with '\n\n' as the content when
* Filter out empty "null" blocks from the block list.
* 'parse_blocks' includes a null block with '\n\n' as the content when
* it encounters whitespace. This is not a bug but rather how the parser
* is designed.
*
* @param array $parsed_blocks the parsed blocks to be filtered.
* @return array the filtered parsed blocks.
* @param array $parsed_blocks the parsed blocks to be normalized.
* @return array the normalized parsed blocks.
*/
function block_core_navigation_filter_out_invalid_blocks( $parsed_blocks ) {
// This list is duplicated in /packages/block-library/src/navigation/edit/inner-blocks.js.
$allowed_blocks = array(
'core/navigation-link',
'core/search',
'core/social-links',
'core/social-link',
'core/page-list',
'core/spacer',
'core/home-link',
'core/site-title',
'core/site-logo',
'core/navigation-submenu',
);

$filtered = array_reduce(
function block_core_navigation_filter_out_empty_blocks( $parsed_blocks ) {
$filtered = array_filter(
$parsed_blocks,
function( $carry, $block ) use ( $allowed_blocks ) {
if ( isset( $block['blockName'] ) && in_array( $block['blockName'], $allowed_blocks, true ) ) {
if ( $block['innerBlocks'] ) {
$block['innerBlocks'] = block_core_navigation_filter_out_invalid_blocks( $block['innerBlocks'] );
if ( empty( $block['innerBlocks'] ) ) {
$block['innerContent'] = array( implode( $block['innerContent'] ) );
}
}
$carry[] = $block;
}
return $carry;
},
array()
function( $block ) {
return isset( $block['blockName'] );
}
);

// Reset keys.
Expand Down Expand Up @@ -472,8 +443,7 @@ function block_core_navigation_get_fallback_blocks() {

// Use the first non-empty Navigation as fallback if available.
if ( $navigation_post ) {

$maybe_fallback = block_core_navigation_filter_out_invalid_blocks( parse_blocks( $navigation_post->post_content ) );
$maybe_fallback = block_core_navigation_filter_out_empty_blocks( parse_blocks( $navigation_post->post_content ) );

// Normalizing blocks may result in an empty array of blocks if they were all `null` blocks.
// In this case default to the (Page List) fallback.
Expand Down Expand Up @@ -541,6 +511,7 @@ function block_core_navigation_from_block_get_post_ids( $block ) {
function render_block_core_navigation( $attributes, $content, $block ) {

static $seen_menu_names = array();
static $seen_ref = array();

// Flag used to indicate whether the rendered output is considered to be
// a fallback (i.e. the block has no menu associated with it).
Expand Down Expand Up @@ -611,6 +582,11 @@ function render_block_core_navigation( $attributes, $content, $block ) {

// Load inner blocks from the navigation post.
if ( array_key_exists( 'ref', $attributes ) ) {
if ( in_array( $attributes['ref'], $seen_ref, true ) ) {
return '';
}
$seen_ref[] = $attributes['ref'];

$navigation_post = get_post( $attributes['ref'] );
if ( ! isset( $navigation_post ) ) {
return '';
Expand All @@ -631,7 +607,7 @@ function render_block_core_navigation( $attributes, $content, $block ) {

// 'parse_blocks' includes a null block with '\n\n' as the content when
// it encounters whitespace. This code strips it.
$compacted_blocks = block_core_navigation_filter_out_invalid_blocks( $parsed_blocks );
$compacted_blocks = block_core_navigation_filter_out_empty_blocks( $parsed_blocks );

// TODO - this uses the full navigation block attributes for the
// context which could be refined.
Expand Down Expand Up @@ -703,22 +679,41 @@ function render_block_core_navigation( $attributes, $content, $block ) {
_prime_post_caches( $post_ids, false, false );
}

$list_item_nav_blocks = array(
'core/navigation-link',
'core/home-link',
'core/site-title',
'core/site-logo',
'core/navigation-submenu',
);

$needs_list_item_wrapper = array(
'core/site-title',
'core/site-logo',
);

$inner_blocks_html = '';
$is_list_open = false;
foreach ( $inner_blocks as $inner_block ) {
if ( ( 'core/navigation-link' === $inner_block->name || 'core/home-link' === $inner_block->name || 'core/site-title' === $inner_block->name || 'core/site-logo' === $inner_block->name || 'core/navigation-submenu' === $inner_block->name ) && ! $is_list_open ) {
$is_list_item = in_array( $inner_block->name, $list_item_nav_blocks, true );

if ( $is_list_item && ! $is_list_open ) {
$is_list_open = true;
$inner_blocks_html .= '<ul class="wp-block-navigation__container">';
}
if ( 'core/navigation-link' !== $inner_block->name && 'core/home-link' !== $inner_block->name && 'core/site-title' !== $inner_block->name && 'core/site-logo' !== $inner_block->name && 'core/navigation-submenu' !== $inner_block->name && $is_list_open ) {

if ( ! $is_list_item && $is_list_open ) {
$is_list_open = false;
$inner_blocks_html .= '</ul>';
}

$inner_block_content = $inner_block->render();
if ( 'core/site-title' === $inner_block->name || ( 'core/site-logo' === $inner_block->name && $inner_block_content ) ) {
$inner_blocks_html .= '<li class="wp-block-navigation-item">' . $inner_block_content . '</li>';
} else {
$inner_blocks_html .= $inner_block_content;
if ( ! empty( $inner_block_content ) ) {
if ( in_array( $inner_block->name, $needs_list_item_wrapper, true ) ) {
$inner_blocks_html .= '<li class="wp-block-navigation-item">' . $inner_block_content . '</li>';
} else {
$inner_blocks_html .= $inner_block_content;
}
}
}

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