644 lines
15 KiB
PHP
644 lines
15 KiB
PHP
<?php
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/**
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* @package WPSEO\Frontend
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*/
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/**
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* This class handles the Twitter card functionality.
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*
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* @link https://dev.twitter.com/docs/cards
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*/
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class WPSEO_Twitter {
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/**
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* @var object Instance of this class
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*/
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public static $instance;
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/**
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* @var array Images
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*/
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private $images = array();
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/**
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* @var array Images
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*/
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public $shown_images = array();
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/**
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* @var array $options Holds the options for the Twitter Card functionality
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*/
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public $options;
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/**
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* Will hold the Twitter card type being created
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*
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* @var string
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*/
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private $type;
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/**
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* Class constructor
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*/
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public function __construct() {
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$this->options = WPSEO_Options::get_option( 'wpseo_social' );
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$this->twitter();
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}
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/**
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* Outputs the Twitter Card code on singular pages.
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*/
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public function twitter() {
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wp_reset_query();
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$this->type();
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$this->description();
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$this->title();
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$this->site_twitter();
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$this->image();
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if ( is_singular() ) {
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$this->author();
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}
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/**
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* Action: 'wpseo_twitter' - Hook to add all Yoast SEO Twitter output to so they're close together.
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*/
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do_action( 'wpseo_twitter' );
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}
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/**
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* Display the Twitter card type.
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*
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* This defaults to summary but can be filtered using the <code>wpseo_twitter_card_type</code> filter.
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*
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* @link https://dev.twitter.com/docs/cards
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*/
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protected function type() {
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$this->determine_card_type();
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$this->sanitize_card_type();
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$this->output_metatag( 'card', $this->type );
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}
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/**
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* Determines the twitter card type for the current page
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*/
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private function determine_card_type() {
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$this->type = $this->options['twitter_card_type'];
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// TODO this should be reworked to use summary_large_image for any fitting image R.
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if ( is_singular() && has_shortcode( $GLOBALS['post']->post_content, 'gallery' ) ) {
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$this->images = get_post_gallery_images();
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if ( count( $this->images ) > 0 ) {
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$this->type = 'summary_large_image';
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}
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}
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/**
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* Filter: 'wpseo_twitter_card_type' - Allow changing the Twitter Card type as output in the Twitter card by Yoast SEO
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*
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* @api string $unsigned The type string
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*/
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$this->type = apply_filters( 'wpseo_twitter_card_type', $this->type );
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}
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/**
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* Determines whether the card type is of a type currently allowed by Twitter
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*
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* @link https://dev.twitter.com/cards/types
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*/
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private function sanitize_card_type() {
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if ( ! in_array( $this->type, array(
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'summary',
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'summary_large_image',
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'app',
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'player',
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) )
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) {
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$this->type = 'summary';
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}
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}
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/**
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* Output the metatag
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*
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* @param string $name Tag name string.
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* @param string $value Tag value string.
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* @param bool $escaped Force escape flag.
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*/
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private function output_metatag( $name, $value, $escaped = false ) {
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// Escape the value if not escaped.
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if ( false === $escaped ) {
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$value = esc_attr( $value );
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}
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/**
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* Filter: 'wpseo_twitter_metatag_key' - Make the Twitter metatag key filterable
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*
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* @api string $key The Twitter metatag key
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*/
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$metatag_key = apply_filters( 'wpseo_twitter_metatag_key', 'name' );
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// Output meta.
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echo '<meta ', esc_attr( $metatag_key ), '="twitter:', esc_attr( $name ), '" content="', $value, '" />', "\n";
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}
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/**
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* Displays the description for Twitter.
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*
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* Only used when OpenGraph is inactive.
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*/
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protected function description() {
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if ( is_singular() ) {
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$meta_desc = $this->single_description();
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}
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elseif ( WPSEO_Frontend::get_instance()->is_posts_page() ) {
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$meta_desc = $this->single_description( get_option( 'page_for_posts' ) );
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}
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elseif ( is_category() || is_tax() || is_tag() ) {
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$meta_desc = $this->taxonomy_description();
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}
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else {
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$meta_desc = $this->fallback_description();
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}
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/**
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* Filter: 'wpseo_twitter_description' - Allow changing the Twitter description as output in the Twitter card by Yoast SEO
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*
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* @api string $twitter The description string
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*/
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$meta_desc = apply_filters( 'wpseo_twitter_description', $meta_desc );
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if ( is_string( $meta_desc ) && $meta_desc !== '' ) {
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$this->output_metatag( 'description', $meta_desc );
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}
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}
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/**
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* Returns the description for a singular page
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*
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* @param int $post_id Post ID.
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*
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* @return string
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*/
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private function single_description( $post_id = 0 ) {
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$meta_desc = trim( WPSEO_Meta::get_value( 'twitter-description', $post_id ) );
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if ( is_string( $meta_desc ) && '' !== $meta_desc ) {
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return $meta_desc;
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}
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$meta_desc = $this->fallback_description();
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if ( is_string( $meta_desc ) && '' !== $meta_desc ) {
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return $meta_desc;
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}
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return strip_tags( get_the_excerpt() );
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}
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/**
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* Getting the description for the taxonomy
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*
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* @return bool|mixed|string
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*/
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private function taxonomy_description() {
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$meta_desc = WPSEO_Taxonomy_Meta::get_meta_without_term( 'twitter-description' );
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if ( ! is_string( $meta_desc ) || $meta_desc === '' ) {
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$meta_desc = $this->fallback_description();
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}
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if ( is_string( $meta_desc ) || $meta_desc !== '' ) {
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return $meta_desc;
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}
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return trim( strip_tags( term_description() ) );
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}
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/**
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* Returns a fallback description
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*
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* @return string
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*/
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private function fallback_description() {
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return trim( WPSEO_Frontend::get_instance()->metadesc( false ) );
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}
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/**
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* Displays the title for Twitter.
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*
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* Only used when OpenGraph is inactive.
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*/
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protected function title() {
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if ( is_singular() ) {
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$title = $this->single_title();
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}
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elseif ( WPSEO_Frontend::get_instance()->is_posts_page() ) {
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$title = $this->single_title( get_option( 'page_for_posts' ) );
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}
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elseif ( is_category() || is_tax() || is_tag() ) {
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$title = $this->taxonomy_title();
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}
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else {
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$title = $this->fallback_title();
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}
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/**
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* Filter: 'wpseo_twitter_title' - Allow changing the Twitter title as output in the Twitter card by Yoast SEO
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*
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* @api string $twitter The title string
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*/
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$title = apply_filters( 'wpseo_twitter_title', $title );
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if ( is_string( $title ) && $title !== '' ) {
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$this->output_metatag( 'title', $title );
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}
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}
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/**
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* Returns the Twitter title for a single post
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*
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* @param int $post_id Post ID.
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*
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* @return string
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*/
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private function single_title( $post_id = 0 ) {
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$title = WPSEO_Meta::get_value( 'twitter-title', $post_id );
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if ( ! is_string( $title ) || $title === '' ) {
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return $this->fallback_title();
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}
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return $title;
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}
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/**
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* Getting the title for the taxonomy
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*
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* @return bool|mixed|string
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*/
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private function taxonomy_title() {
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$title = WPSEO_Taxonomy_Meta::get_meta_without_term( 'twitter-title' );
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if ( ! is_string( $title ) || $title === '' ) {
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return $this->fallback_title();
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}
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return $title;
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}
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/**
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* Returns the Twitter title for any page
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*
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* @return string
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*/
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private function fallback_title() {
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return WPSEO_Frontend::get_instance()->title( '' );
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}
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/**
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* Displays the Twitter account for the site.
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*/
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protected function site_twitter() {
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/**
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* Filter: 'wpseo_twitter_site' - Allow changing the Twitter site account as output in the Twitter card by Yoast SEO
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*
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* @api string $unsigned Twitter site account string
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*/
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$site = apply_filters( 'wpseo_twitter_site', $this->options['twitter_site'] );
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$site = $this->get_twitter_id( $site );
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if ( is_string( $site ) && $site !== '' ) {
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$this->output_metatag( 'site', '@' . $site );
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}
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}
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/**
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* Checks if the given id is actually an id or a url and if url, distills the id from it.
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*
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* Solves issues with filters returning urls and theme's/other plugins also adding a user meta
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* twitter field which expects url rather than an id (which is what we expect).
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*
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* @param string $id Twitter ID or url.
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*
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* @return string|bool Twitter ID or false if it failed to get a valid Twitter ID.
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*/
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private function get_twitter_id( $id ) {
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if ( preg_match( '`([A-Za-z0-9_]{1,25})$`', $id, $match ) ) {
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return $match[1];
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}
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else {
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return false;
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}
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}
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/**
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* Displays the image for Twitter
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*
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* Only used when OpenGraph is inactive or Summary Large Image card is chosen.
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*/
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protected function image() {
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if ( is_category() || is_tax() || is_tag() ) {
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$this->taxonomy_image_output();
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}
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else {
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$this->single_image_output();
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}
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if ( count( $this->shown_images ) === 0 && $this->options['og_default_image'] !== '' ) {
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$this->image_output( $this->options['og_default_image'] );
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}
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}
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/**
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* Outputs the first image of a gallery.
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*/
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private function gallery_images_output() {
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$this->image_output( reset( $this->images ) );
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}
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/**
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* @return bool
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*/
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private function taxonomy_image_output() {
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foreach ( array( 'twitter-image', 'opengraph-image' ) as $tag ) {
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$img = WPSEO_Taxonomy_Meta::get_meta_without_term( $tag );
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if ( $img !== '' ) {
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$this->image_output( $img );
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return true;
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}
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}
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return false;
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}
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/**
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* Takes care of image output when we only need to display a single image.
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*/
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private function single_image_output() {
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if ( $this->homepage_image_output() ) {
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return;
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}
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elseif ( $this->posts_page_image_output() ) { // Posts page, which won't be caught by is_singular() below.
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return;
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}
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if ( is_singular() ) {
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if ( $this->image_from_meta_values_output() ) {
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return;
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}
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$post_id = get_the_ID();
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if ( $this->image_of_attachment_page_output( $post_id ) ) {
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return;
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}
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if ( $this->image_thumbnail_output() ) {
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return;
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}
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if ( count( $this->images ) > 0 ) {
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$this->gallery_images_output();
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return;
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}
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if ( $this->image_from_content_output() ) {
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return;
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}
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}
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}
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/**
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* Show the front page image
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*
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* @return bool
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*/
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private function homepage_image_output() {
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if ( is_front_page() ) {
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if ( $this->options['og_frontpage_image'] !== '' ) {
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$this->image_output( $this->options['og_frontpage_image'] );
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return true;
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}
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}
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return false;
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}
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/**
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* Show the posts page image.
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*
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* @return bool
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*/
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private function posts_page_image_output() {
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if ( is_front_page() || ! is_home() ) {
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return false;
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}
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$post_id = get_option( 'page_for_posts' );
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if ( $this->image_from_meta_values_output( $post_id ) ) {
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return true;
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}
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if ( $this->image_thumbnail_output( $post_id ) ) {
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return true;
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}
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return false;
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}
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/**
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* Outputs a Twitter image tag for a given image
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*
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* @param string $img The source URL to the image.
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* @param boolean $tag Deprecated argument, previously used for gallery images.
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*
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* @return bool
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*/
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protected function image_output( $img, $tag = false ) {
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if ( $tag ) {
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_deprecated_argument( __METHOD__, 'WPSEO 2.4' );
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}
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/**
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* Filter: 'wpseo_twitter_image' - Allow changing the Twitter Card image
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*
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* @api string $img Image URL string
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*/
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$img = apply_filters( 'wpseo_twitter_image', $img );
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if ( WPSEO_Utils::is_url_relative( $img ) === true && $img[0] === '/' ) {
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$parsed_url = parse_url( home_url() );
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$img = $parsed_url['scheme'] . '://' . $parsed_url['host'] . $img;
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}
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$escaped_img = esc_url( $img );
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if ( in_array( $escaped_img, $this->shown_images ) ) {
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return false;
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}
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if ( is_string( $escaped_img ) && $escaped_img !== '' ) {
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$this->output_metatag( 'image', $escaped_img, true );
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array_push( $this->shown_images, $escaped_img );
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return true;
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}
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return false;
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}
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/**
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* Retrieve images from the post meta values
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*
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* @param int $post_id Optional post ID to use.
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*
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* @return bool
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*/
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private function image_from_meta_values_output( $post_id = 0 ) {
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foreach ( array( 'twitter-image', 'opengraph-image' ) as $tag ) {
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$img = WPSEO_Meta::get_value( $tag, $post_id );
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if ( $img !== '' ) {
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$this->image_output( $img );
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return true;
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}
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}
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return false;
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}
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/**
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* Retrieve an attachment page's attachment
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*
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* @param string $attachment_id The ID of the attachment for which to retrieve the image.
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*
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* @return bool
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*/
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private function image_of_attachment_page_output( $attachment_id ) {
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if ( get_post_type( $attachment_id ) === 'attachment' ) {
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$mime_type = get_post_mime_type( $attachment_id );
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switch ( $mime_type ) {
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case 'image/jpeg':
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case 'image/png':
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case 'image/gif':
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$this->image_output( wp_get_attachment_url( $attachment_id ) );
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return true;
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}
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}
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return false;
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}
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/**
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* Retrieve the featured image
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*
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* @param int $post_id Optional post ID to use.
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*
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* @return bool
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*/
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private function image_thumbnail_output( $post_id = 0 ) {
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if ( empty( $post_id ) ) {
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$post_id = get_the_ID();
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}
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if ( function_exists( 'has_post_thumbnail' ) && has_post_thumbnail( $post_id ) ) {
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/**
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* Filter: 'wpseo_twitter_image_size' - Allow changing the Twitter Card image size
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*
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* @api string $featured_img Image size string
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*/
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$featured_img = wp_get_attachment_image_src( get_post_thumbnail_id( $post_id ), apply_filters( 'wpseo_twitter_image_size', 'full' ) );
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if ( $featured_img ) {
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$this->image_output( $featured_img[0] );
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return true;
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}
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}
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return false;
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}
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/**
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* Retrieve the image from the content
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*
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* @return bool
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*/
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private function image_from_content_output() {
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/**
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* Filter: 'wpseo_pre_analysis_post_content' - Allow filtering the content before analysis
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*
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* @api string $post_content The Post content string
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*
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* @param object $post - The post object.
|
|
*/
|
|
global $post;
|
|
$content = apply_filters( 'wpseo_pre_analysis_post_content', $post->post_content, $post );
|
|
|
|
if ( preg_match_all( '`<img [^>]+>`', $content, $matches ) ) {
|
|
foreach ( $matches[0] as $img ) {
|
|
if ( preg_match( '`src=(["\'])(.*?)\1`', $img, $match ) ) {
|
|
$this->image_output( $match[2] );
|
|
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Displays the authors Twitter account.
|
|
*/
|
|
protected function author() {
|
|
$twitter = ltrim( trim( get_the_author_meta( 'twitter', get_post()->post_author ) ), '@' );
|
|
/**
|
|
* Filter: 'wpseo_twitter_creator_account' - Allow changing the Twitter account as output in the Twitter card by Yoast SEO
|
|
*
|
|
* @api string $twitter The twitter account name string
|
|
*/
|
|
$twitter = apply_filters( 'wpseo_twitter_creator_account', $twitter );
|
|
$twitter = $this->get_twitter_id( $twitter );
|
|
|
|
if ( is_string( $twitter ) && $twitter !== '' ) {
|
|
$this->output_metatag( 'creator', '@' . $twitter );
|
|
}
|
|
elseif ( $this->options['twitter_site'] !== '' ) {
|
|
if ( is_string( $this->options['twitter_site'] ) && $this->options['twitter_site'] !== '' ) {
|
|
$this->output_metatag( 'creator', '@' . $this->options['twitter_site'] );
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Get the singleton instance of this class
|
|
*
|
|
* @return object
|
|
*/
|
|
public static function get_instance() {
|
|
if ( ! ( self::$instance instanceof self ) ) {
|
|
self::$instance = new self();
|
|
}
|
|
|
|
return self::$instance;
|
|
}
|
|
|
|
/**
|
|
* Displays the domain tag for the site.
|
|
*
|
|
* @deprecated 3.0
|
|
*/
|
|
protected function site_domain() {
|
|
_deprecated_function( __METHOD__, 'WPSEO 3.0' );
|
|
}
|
|
} /* End of class */
|