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<?php
/**
* Media functions file.
*
* Functions for processing remote media (images, audio, video) in ActivityPub content.
*
* @package Activitypub
*/
namespace Activitypub;
/**
* Check if a URL is a remote URL (not local to this site).
*
* @param string $url The URL to check.
*
* @return bool True if the URL is remote, false otherwise.
*/
function is_remote_url( $url ) {
// Must be http/https URL.
if ( ! \preg_match( '#^https?://#i', $url ) ) {
return false;
}
// Compare hosts to determine if URL is local.
$site_host = \wp_parse_url( \home_url(), PHP_URL_HOST );
$url_host = \wp_parse_url( $url, PHP_URL_HOST );
// If hosts match, it's a local URL.
if ( $site_host && $url_host && 0 === \strcasecmp( $site_host, $url_host ) ) {
return false;
}
// Also check uploads directory with strict prefix match.
$upload_dir = \wp_upload_dir();
$upload_base = isset( $upload_dir['baseurl'] ) ? \trailingslashit( $upload_dir['baseurl'] ) : '';
if ( $upload_base && \str_starts_with( $url, $upload_base ) ) {
return false;
}
return true;
}
/**
* Generate an image block wrapper for a remote image.
*
* @param string $url The remote image URL.
* @param string $img_html The img tag HTML.
*
* @return string The wrapped image block.
*/
function generate_image_block( $url, $img_html ) {
return \sprintf(
'<!-- wp:activitypub/image %s -->%s<!-- /wp:activitypub/image -->',
\wp_json_encode( array( 'url' => $url ) ),
$img_html
);
}
/**
* Generate an audio block wrapper for a remote audio file.
*
* @param string $url The remote audio URL.
*
* @return string The audio block markup.
*/
function generate_audio_block( $url ) {
return \sprintf(
'<!-- wp:activitypub/audio %s --><figure class="wp-block-audio"><audio controls src="%s"></audio></figure><!-- /wp:activitypub/audio -->',
\wp_json_encode( array( 'url' => $url ) ),
\esc_url( $url )
);
}
/**
* Generate a video block wrapper for a remote video file.
*
* @param string $url The remote video URL.
*
* @return string The video block markup.
*/
function generate_video_block( $url ) {
return \sprintf(
'<!-- wp:activitypub/video %s --><figure class="wp-block-video"><video controls src="%s"></video></figure><!-- /wp:activitypub/video -->',
\wp_json_encode( array( 'url' => $url ) ),
\esc_url( $url )
);
}
/**
* Process remote images in content and from attachments.
*
* Wraps remote `<img>` tags with activitypub/image blocks for lazy caching,
* and appends any attachments not already present in the content.
*
* @param string $content The content to process.
* @param array $attachments Optional. Array of attachments with 'url' and 'alt' keys.
*
* @return string The content with wrapped images and appended attachments.
*/
function process_remote_images( $content, $attachments = array() ) {
if ( empty( $content ) && empty( $attachments ) ) {
return $content;
}
// Track URLs we've seen to avoid duplicates.
$seen_urls = array();
// Process existing images in content.
if ( ! empty( $content ) && false !== \strpos( $content, '<img' ) ) {
$processor = new \WP_HTML_Tag_Processor( $content );
// Mark remote images for wrapping using a data attribute.
while ( $processor->next_tag( 'IMG' ) ) {
$src = $processor->get_attribute( 'src' );
if ( $src && is_remote_url( $src ) && ! isset( $seen_urls[ $src ] ) ) {
$processor->set_attribute( 'data-activitypub-wrap', '1' );
$seen_urls[ $src ] = true;
}
}
$content = $processor->get_updated_html();
// Wrap marked images, skipping those already in image blocks.
$content = \preg_replace_callback(
'/<!-- wp:activitypub\/image[^>]*-->.*?<!-- \/wp:activitypub\/image -->(*SKIP)(?!)|<img\s+([^>]*)data-activitypub-wrap="1"([^>]*)>/is',
function ( $matches ) {
if ( empty( $matches[1] ) && empty( $matches[2] ) ) {
return $matches[0]; // Skipped block.
}
// Reconstruct img tag without the marker attribute.
$img_html = '<img ' . \trim( $matches[1] . $matches[2] ) . '>';
// Extract src URL from the img tag.
if ( \preg_match( '/src=["\']([^"\']+)["\']/', $img_html, $src_match ) ) {
return generate_image_block( $src_match[1], $img_html );
}
return $matches[0];
},
$content
);
}
// Append attachments not already in content.
if ( ! empty( $attachments ) ) {
foreach ( $attachments as $attachment ) {
$url = $attachment['url'] ?? '';
if ( empty( $url ) || isset( $seen_urls[ $url ] ) ) {
continue;
}
// Also check if URL appears in content (in case it wasn't in an img tag).
if ( false !== \strpos( $content, $url ) ) {
continue;
}
$alt = ! empty( $attachment['alt'] ) ? \esc_attr( $attachment['alt'] ) : '';
$img_tag = $alt
? \sprintf( '<img src="%s" alt="%s" />', \esc_url( $url ), $alt )
: \sprintf( '<img src="%s" />', \esc_url( $url ) );
$content .= "\n\n" . generate_image_block( $url, $img_tag );
$seen_urls[ $url ] = true;
}
}
return $content;
}
/**
* Process remote media in content and from attachments.
*
* Delegates image attachments to process_remote_images() and appends
* audio/video attachments as their respective block types.
*
* @param string $content The content to process.
* @param array $attachments Optional. Array of attachments with 'url', 'alt', and 'type' keys.
*
* @return string The content with wrapped images and appended audio/video blocks.
*/
function process_remote_media( $content, $attachments = array() ) {
// Separate attachments by type.
$image_attachments = array();
$media_attachments = array();
foreach ( $attachments as $attachment ) {
$type = $attachment['type'] ?? 'image';
if ( 'audio' === $type || 'video' === $type ) {
$media_attachments[] = $attachment;
} else {
$image_attachments[] = $attachment;
}
}
// Delegate image attachments to existing handler.
$content = process_remote_images( $content, $image_attachments );
// Append audio/video blocks.
foreach ( $media_attachments as $attachment ) {
$url = $attachment['url'] ?? '';
if ( empty( $url ) ) {
continue;
}
// Skip if URL already appears in content.
if ( false !== \strpos( $content, $url ) ) {
continue;
}
$type = $attachment['type'];
if ( 'audio' === $type ) {
$content .= "\n\n" . generate_audio_block( $url );
} elseif ( 'video' === $type ) {
$content .= "\n\n" . generate_video_block( $url );
}
}
return $content;
}