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Bugfix/NGO-951/Preload Assets #71

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65 changes: 65 additions & 0 deletions inc/head.php
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Original file line number Diff line number Diff line change
Expand Up @@ -19,14 +19,79 @@
* Hooks
*/
\add_filter( 'wp_resource_hints', __NAMESPACE__ . '\\add_dns_prefetch', 10, 2 );
\add_filter('wp_preload_resources', __NAMESPACE__ . '\\add_resource_preload' );

/**
* Add DNS prefetch.
*/
function add_dns_prefetch( array $hints, string $relation_type ): array {
if ( 'preconnect' === $relation_type ) {
$hints[] = get_base_url();
$hints[] = 'https://assets.fundy.cloud';
}

return $hints;
}

/**
* Add script preload.
*/
function add_resource_preload( array $resources ): array {
$resources[] = [
'href' => 'https://assets.fundy.cloud/fundy-forms.latest.js',
'as' => 'script',
'crossorigin' => 'anonymous',
];

foreach ( get_current_post_form_ids() as $form_id ) {
$resources[] = [
'href' => get_base_url() . '/api/v1/form/schema/' . $form_id,
'as' => 'fetch',
'crossorigin' => 'anonymous',
];
}

return $resources;
}

/**
* Collect form IDs from donation-form blocks in the current singular post.
*
* @return int[]
*/
function get_current_post_form_ids(): array {
if ( ! \is_singular() ) {
return [];
}

$post = \get_post();
if ( ! $post instanceof \WP_Post || ! \has_blocks( $post->post_content ) ) {
return [];
}

$form_ids = [];
collect_donation_form_ids( \parse_blocks( $post->post_content ), $form_ids );

return \array_values( \array_unique( $form_ids ) );
}

/**
* Walk parsed blocks recursively and collect donation-form IDs.
*
* @param array $blocks Parsed blocks.
* @param int[] $form_ids Accumulator, passed by reference.
*/
function collect_donation_form_ids( array $blocks, array &$form_ids ): void {
foreach ( $blocks as $block ) {
if ( 'fundy/donation-form' === ( $block['blockName'] ?? '' ) ) {
$form_id = (int) ( $block['attrs']['formId'] ?? 0 );
if ( $form_id > 0 ) {
$form_ids[] = $form_id;
}
}

if ( ! empty( $block['innerBlocks'] ) ) {
collect_donation_form_ids( $block['innerBlocks'], $form_ids );
}
}
}