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<?php
/**
* Yoast SEO: News plugin file.
*
* @package WPSEO_News\XML_Sitemaps
*/
/**
* Handle images used in News.
*/
class WPSEO_News_Sitemap_Images {
/**
* The current item.
*
* @var object
*/
private $item;
/**
* The output that will be returned.
*
* @var string
*/
private $output = '';
/**
* The options.
*
* @var array
*/
private $options;
/**
* Storage for the images.
*
* @var array
*/
private $images;
/**
* Setting properties and build the item.
*
* @param object $item News post object.
* @param array $options The options.
*/
public function __construct( $item, $options ) {
$this->item = $item;
$this->options = $options;
$this->parse_item_images();
}
/**
* Return the output, because the object is converted to a string.
*
* @return string
*/
public function __toString() {
return $this->output;
}
/**
* Parsing the images from the item.
*/
private function parse_item_images() {
$this->get_item_images();
if ( ! empty( $this->images ) ) {
foreach ( $this->images as $src => $img ) {
$this->parse_item_image( $src, $img );
}
}
}
/**
* Getting the images for the given $item.
*/
private function get_item_images() {
$restrict_sitemap_featured_img = isset( $this->options['restrict_sitemap_featured_img'] ) ? $this->options['restrict_sitemap_featured_img'] : false;
if ( ! $restrict_sitemap_featured_img && preg_match_all( '/<img [^>]+>/', $this->item->post_content, $matches ) ) {
$this->get_images_from_content( $matches );
}
// Also check if the featured image value is set.
$post_thumbnail_id = get_post_thumbnail_id( $this->item->ID );
if ( '' !== $post_thumbnail_id ) {
$this->get_item_featured_image( $post_thumbnail_id );
}
}
/**
* Getting the images from the content.
*
* @param array $matches Images found in the content.
*/
private function get_images_from_content( $matches ) {
foreach ( $matches[0] as $img ) {
if ( ! preg_match( '/src=("|\')([^"|\']+)("|\')/', $img, $match ) ) {
continue;
}
$src = $this->parse_image_source( $match[2] );
if ( ! empty( $src ) && ! isset( $this->images[ $src ] ) ) {
$this->images[ $src ] = $this->parse_image( $img );
}
}
}
/**
* Parsing the image source.
*
* @param string $src Image Source.
*
* @return string|void
*/
private function parse_image_source( $src ) {
static $home_url;
if ( is_null( $home_url ) ) {
$home_url = home_url();
}
if ( strpos( $src, 'http' ) !== 0 && strpos( $src, '//' ) !== 0 ) {
if ( $src[0] !== '/' ) {
return null;
}
$src = $home_url . $src;
}
if ( $src !== esc_url( $src ) ) {
return null;
}
return $src;
}
/**
* Setting title and alt for image and returns them in an array.
*
* @param string $img Image HTML.
*
* @return array
*/
private function parse_image( $img ) {
$image = array();
if ( preg_match( '/title=("|\')([^"\']+)("|\')/', $img, $match ) ) {
$image['title'] = str_replace( array( '-', '_' ), ' ', $match[2] );
}
if ( preg_match( '/alt=("|\')([^"\']+)("|\')/', $img, $match ) ) {
$image['alt'] = str_replace( array( '-', '_' ), ' ', $match[2] );
}
return $image;
}
/**
* Parse the XML for given image.
*
* @param string $src Image source.
* @param array $img Image array.
*
* @return void
*/
private function parse_item_image( $src, $img ) {
/**
* Filter: 'wpseo_xml_sitemap_img_src' - Allow changing of sitemap image src.
*
* @api string $src The image source.
*
* @param object $item The post item.
*/
$src = apply_filters( 'wpseo_xml_sitemap_img_src', $src, $this->item );
$this->output .= "\t<image:image>\n";
$this->output .= "\t\t<image:loc>" . htmlspecialchars( $src ) . "</image:loc>\n";
if ( ! empty( $img['title'] ) ) {
$this->output .= "\t\t<image:title>" . htmlspecialchars( $img['title'] ) . "</image:title>\n";
}
if ( ! empty( $img['alt'] ) ) {
$this->output .= "\t\t<image:caption>" . htmlspecialchars( $img['alt'] ) . "</image:caption>\n";
}
$this->output .= "\t</image:image>\n";
}
/**
* Getting the featured image.
*
* @param integer $post_thumbnail_id Thumbnail ID.
*
* @return void
*/
private function get_item_featured_image( $post_thumbnail_id ) {
$attachment = $this->get_attachment( $post_thumbnail_id );
if ( empty( $attachment ) ) {
return;
}
$image = array();
if ( ! empty( $attachment['title'] ) ) {
$image['title'] = $attachment['title'];
}
if ( ! empty( $attachment['alt'] ) ) {
$image['alt'] = $attachment['alt'];
}
if ( ! empty( $attachment['href'] ) ) {
$this->images[ $attachment['href'] ] = $image;
}
elseif ( ! empty( $attachment['src'] ) ) {
$this->images[ $attachment['src'] ] = $image;
}
}
/**
* Get attachment.
*
* @param int $attachment_id Attachment ID.
*
* @return array
*/
private function get_attachment( $attachment_id ) {
// Get attachment.
$attachment = get_post( $attachment_id );
// Check if we've found an attachment.
if ( is_null( $attachment ) ) {
return array();
}
// Return properties.
return array(
'title' => $attachment->post_title,
'alt' => get_post_meta( $attachment->ID, '_wp_attachment_image_alt', true ),
'href' => wp_get_attachment_url( $attachment->ID ),
'src' => $attachment->guid,
);
}
}