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<?php
/**
* Class AMP_Imgur_Embed_Handler
*
* @package AMP
* @since 1.0
*/
/**
* Class AMP_Imgur_Embed_Handler
*
* @internal
*/
class AMP_Imgur_Embed_Handler extends AMP_Base_Embed_Handler {
/**
* Regex matched to produce output amp-imgur.
*
* @var string
*/
const URL_PATTERN = '#https?://(www\.)?imgur\.com/.*#i';
/**
* Register embed.
*/
public function register_embed() {
add_filter( 'embed_oembed_html', [ $this, 'filter_embed_oembed_html' ], 10, 3 );
}
/**
* Unregister embed.
*/
public function unregister_embed() {
remove_filter( 'embed_oembed_html', [ $this, 'filter_embed_oembed_html' ], 10 );
}
/**
* Filter oEmbed HTML for Imgur to prepare it for AMP.
*
* @param mixed $return The oEmbed HTML.
* @param string $url The attempted embed URL.
* @param array $attr Attributes.
* @return string Embed.
*/
public function filter_embed_oembed_html( $return, $url, $attr ) {
$parsed_url = wp_parse_url( $url );
if ( ! isset( $parsed_url['host'], $parsed_url['path'] ) ) {
return $return;
}
if ( false !== strpos( $parsed_url['host'], 'imgur.com' ) ) {
if ( empty( $attr['height'] ) ) {
return $return;
}
$attributes = wp_array_slice_assoc( $attr, [ 'width', 'height' ] );
if ( empty( $attr['width'] ) ) {
$attributes['layout'] = 'fixed-height';
$attributes['width'] = 'auto';
}
$attributes['data-imgur-id'] = $this->get_imgur_id_from_url( $parsed_url );
if ( false === $attributes['data-imgur-id'] ) {
return $return;
}
$return = AMP_HTML_Utils::build_tag(
'amp-imgur',
$attributes
);
}
return $return;
}
/**
* Get Imgur ID from URL.
*
* @param array $parsed_url Parsed URL.
* @return bool|string ID / false.
*/
protected function get_imgur_id_from_url( $parsed_url ) {
if ( ! preg_match( '#^(?:/(a|gallery))?/([A-Za-z0-9]+)#', $parsed_url['path'], $matches ) ) {
return false;
}
return ! empty( $matches[1] ) ? "a/{$matches[2]}" : $matches[2];
}
}
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