Archived
347 lines
11 KiB
PHP
347 lines
11 KiB
PHP
<?php
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/**
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* @package Frontend
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*
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* This code handles the OpenGraph output.
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*/
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if ( !defined( 'WPSEO_VERSION' ) ) {
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header( 'HTTP/1.0 403 Forbidden' );
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die;
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}
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/**
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* Adds the OpenGraph output
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*/
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class WPSEO_OpenGraph extends WPSEO_Frontend {
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/**
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* @var array $options Options for the OpenGraph Settings
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*/
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var $options = array();
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/**
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* @var array $shown_images Holds the images that have been put out as OG image.
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*/
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var $shown_images = array();
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/**
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* Class constructor.
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*/
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public function __construct() {
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$this->options = get_option( 'wpseo_social' );
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global $fb_ver;
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if ( isset( $fb_ver ) || class_exists( 'Facebook_Loader' ) ) {
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add_filter( 'fb_meta_tags', array( $this, 'facebook_filter' ), 10, 1 );
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} else {
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add_filter( 'language_attributes', array( $this, 'add_opengraph_namespace' ) );
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add_action( 'wpseo_opengraph', array( $this, 'locale'), 1 );
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add_action( 'wpseo_opengraph', array( $this, 'site_owner'), 20 );
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add_action( 'wpseo_opengraph', array( $this, 'og_title'), 10 );
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add_action( 'wpseo_opengraph', array( $this, 'description'), 11 );
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add_action( 'wpseo_opengraph', array( $this, 'url'), 12 );
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add_action( 'wpseo_opengraph', array( $this, 'site_name'), 13 );
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add_action( 'wpseo_opengraph', array( $this, 'article_author_facebook'), 14 );
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add_action( 'wpseo_opengraph', array( $this, 'website_facebook'), 15 );
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add_action( 'wpseo_opengraph', array( $this, 'type'), 5 );
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add_action( 'wpseo_opengraph', array( $this, 'image'), 30 );
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}
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remove_action( 'wp_head', 'jetpack_og_tags' );
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add_action( 'wpseo_head', array( $this, 'opengraph' ), 30 );
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}
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/**
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* Main OpenGraph output.
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*/
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public function opengraph() {
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wp_reset_query();
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do_action( 'wpseo_opengraph' );
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}
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/**
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* Filter the Facebook plugins metadata
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*
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* @param array $meta_tags the array to fix.
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*
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* @return array $meta_tags
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*/
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public function facebook_filter( $meta_tags ) {
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$meta_tags['http://ogp.me/ns#type'] = $this->type( false );
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$meta_tags['http://ogp.me/ns#title'] = $this->og_title( false );
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// Filter the locale too because the Facebook plugin locale code is not as good as ours.
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$meta_tags['http://ogp.me/ns#locale'] = $this->locale( false );
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$ogdesc = $this->description( false );
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if ( !empty( $ogdesc ) )
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$meta_tags['http://ogp.me/ns#description'] = $ogdesc;
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return $meta_tags;
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}
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/**
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* Filter for the namespace, adding the OpenGraph namespace.
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*
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* @param string $input The input namespace string.
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* @return string
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*/
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public function add_opengraph_namespace( $input ) {
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return $input . ' prefix="og: http://ogp.me/ns#' . ( ( isset( $this->options['fbadminapp'] ) || isset( $this->options['fb_admins'] ) ) ? ' fb: http://ogp.me/ns/fb#' : '' ) . '"';
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}
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/**
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* Outputs the authors FB page.
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*
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* @link https://developers.facebook.com/blog/post/2013/06/19/platform-updates--new-open-graph-tags-for-media-publishers-and-more/
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*/
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public function article_author_facebook() {
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if ( !is_singular() )
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return;
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global $post;
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$facebook = get_the_author_meta( 'facebook', $post->post_author );
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if ( $facebook && !empty( $facebook ) )
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echo "<meta property='article:author' content='" . esc_attr( $facebook ) . "'/>\n";
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}
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/**
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* Outputs the websites FB page.
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*
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* @link https://developers.facebook.com/blog/post/2013/06/19/platform-updates--new-open-graph-tags-for-media-publishers-and-more/
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*/
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public function website_facebook() {
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if ( isset( $this->options['facebook_site'] ) && $this->options['facebook_site'] )
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echo "<meta property='article:publisher' content='" . esc_attr( $this->options['facebook_site'] ) . "'/>\n";
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}
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/**
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* Outputs the site owner
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*/
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public function site_owner() {
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if ( isset( $this->options['fbadminapp'] ) && 0 != $this->options['fbadminapp'] ) {
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echo "<meta property='fb:app_id' content='" . esc_attr( $this->options['fbadminapp'] ) . "'/>\n";
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} else if ( isset( $this->options['fb_admins'] ) && is_array( $this->options['fb_admins'] ) && ( count( $this->options['fb_admins'] ) > 0 ) ) {
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$adminstr = '';
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foreach ( $this->options['fb_admins'] as $admin_id => $admin ) {
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if ( !empty( $adminstr ) )
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$adminstr .= ',' . $admin_id;
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else
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$adminstr = $admin_id;
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}
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echo "<meta property='fb:admins' content='" . esc_attr( $adminstr ) . "'/>\n";
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}
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}
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/**
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* Outputs the SEO title as OpenGraph title.
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*
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* @param bool $echo Whether or not to echo the output.
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* @return string $title
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*/
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public function og_title( $echo = true ) {
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$title = $this->title( '' );
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if ( $echo !== false )
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echo "<meta property='og:title' content='" . esc_attr( $title ) . "'/>\n";
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else
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return $title;
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}
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/**
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* Outputs the canonical URL as OpenGraph URL, which consolidates likes and shares.
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*/
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public function url() {
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echo "<meta property='og:url' content='" . esc_attr( $this->canonical( false ) ) . "'/>\n";
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}
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/**
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* Output the locale, doing some conversions to make sure the proper Facebook locale is outputted.
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*
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* @param bool $echo Whether to echo or return the locale
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*
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* @return string $locale
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*/
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public function locale( $echo = true ) {
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$locale = apply_filters( 'wpseo_locale', get_locale() );
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// catch some weird locales served out by WP that are not easily doubled up.
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$fix_locales = array(
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'ca' => 'ca_ES',
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'en' => 'en_US',
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'el' => 'el_GR',
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'et' => 'et_EE',
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'ja' => 'ja_JP',
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'sq' => 'sq_AL',
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'uk' => 'uk_UA',
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'vi' => 'vi_VN',
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'zh' => 'zh_CN'
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);
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if ( isset( $fix_locales[$locale] ) )
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$locale = $fix_locales[$locale];
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// convert locales like "es" to "es_ES", in case that works for the given locale (sometimes it does)
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if ( strlen( $locale ) == 2 )
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$locale = strtolower( $locale ) . '_' . strtoupper( $locale );
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// These are the locales FB supports
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$fb_valid_fb_locales = array(
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'ca_ES', 'cs_CZ', 'cy_GB', 'da_DK', 'de_DE', 'eu_ES', 'en_PI', 'en_UD', 'ck_US', 'en_US', 'es_LA', 'es_CL', 'es_CO', 'es_ES', 'es_MX',
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'es_VE', 'fb_FI', 'fi_FI', 'fr_FR', 'gl_ES', 'hu_HU', 'it_IT', 'ja_JP', 'ko_KR', 'nb_NO', 'nn_NO', 'nl_NL', 'pl_PL', 'pt_BR', 'pt_PT',
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'ro_RO', 'ru_RU', 'sk_SK', 'sl_SI', 'sv_SE', 'th_TH', 'tr_TR', 'ku_TR', 'zh_CN', 'zh_HK', 'zh_TW', 'fb_LT', 'af_ZA', 'sq_AL', 'hy_AM',
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'az_AZ', 'be_BY', 'bn_IN', 'bs_BA', 'bg_BG', 'hr_HR', 'nl_BE', 'en_GB', 'eo_EO', 'et_EE', 'fo_FO', 'fr_CA', 'ka_GE', 'el_GR', 'gu_IN',
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'hi_IN', 'is_IS', 'id_ID', 'ga_IE', 'jv_ID', 'kn_IN', 'kk_KZ', 'la_VA', 'lv_LV', 'li_NL', 'lt_LT', 'mk_MK', 'mg_MG', 'ms_MY', 'mt_MT',
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'mr_IN', 'mn_MN', 'ne_NP', 'pa_IN', 'rm_CH', 'sa_IN', 'sr_RS', 'so_SO', 'sw_KE', 'tl_PH', 'ta_IN', 'tt_RU', 'te_IN', 'ml_IN', 'uk_UA',
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'uz_UZ', 'vi_VN', 'xh_ZA', 'zu_ZA', 'km_KH', 'tg_TJ', 'ar_AR', 'he_IL', 'ur_PK', 'fa_IR', 'sy_SY', 'yi_DE', 'gn_PY', 'qu_PE', 'ay_BO',
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'se_NO', 'ps_AF', 'tl_ST'
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);
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// check to see if the locale is a valid FB one, if not, use en_US as a fallback
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if ( !in_array( $locale, $fb_valid_fb_locales ) )
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$locale = 'en_US';
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if ( $echo !== false )
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echo "<meta property='og:locale' content='" . esc_attr( $locale ) . "'/>\n";
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else
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return $locale;
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}
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/**
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* Output the OpenGraph type.
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*
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* @param boolean $echo Whether to echo or return the type
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*
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* @return string $type
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*/
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public function type( $echo = true ) {
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if ( is_singular() ) {
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$type = wpseo_get_value( 'og_type' );
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if ( !$type || $type == '' )
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$type = 'article';
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} else {
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$type = 'website';
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}
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$type = apply_filters( 'wpseo_opengraph_type', $type );
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if ( $echo !== false )
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echo "<meta property='og:type' content='" . esc_attr( $type ) . "'/>\n";
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else
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return $type;
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}
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/**
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* Display an OpenGraph image tag
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*
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* @param string $img Source URL to the image
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*
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* @return bool
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*/
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function image_output( $img ) {
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if ( empty( $img ) )
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return false;
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$img = trim( apply_filters( 'wpseo_opengraph_image', $img ) );
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if ( !empty( $img ) ) {
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if ( strpos( $img, 'http' ) !== 0 ) {
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if ( $img[0] != '/' )
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return false;
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// If it's a relative URL, it's relative to the domain, not necessarily to the WordPress install, we
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// want to preserve domain name and URL scheme (http / https) though.
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$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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if ( in_array( $img, $this->shown_images ) )
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return false;
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array_push( $this->shown_images, $img );
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echo "<meta property='og:image' content='" . esc_url( $img ) . "'/>\n";
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return true;
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}
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}
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/**
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* Output the OpenGraph image elements for all the images within the current post/page.
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*
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* @return bool
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*/
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public function image() {
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global $post;
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if ( is_front_page() ) {
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if ( isset( $this->options['og_frontpage_image'] ) )
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$this->image_output( $this->options['og_frontpage_image'] );
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}
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if ( is_singular() ) {
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if ( function_exists( 'has_post_thumbnail' ) && has_post_thumbnail( $post->ID ) ) {
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$thumb = wp_get_attachment_image_src( get_post_thumbnail_id( $post->ID ), apply_filters( 'wpseo_opengraph_image_size', 'large' ) );
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$this->image_output( $thumb[0] );
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}
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if ( preg_match_all( '/<img [^>]+>/', $post->post_content, $matches ) ) {
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foreach ( $matches[0] as $img ) {
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if ( preg_match( '/src=("|\')(.*?)\1/', $img, $match ) )
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$this->image_output( $match[2] );
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}
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}
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}
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if ( count( $this->shown_images ) == 0 && isset( $this->options['og_default_image'] ) )
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$this->image_output( $this->options['og_default_image'] );
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// @TODO add G+ image stuff
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}
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/**
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* Output the OpenGraph description, specific OG description first, if not, grab the meta description.
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*
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* @param bool $echo Whether to echo or return the description
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* @return string $ogdesc
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*/
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public function description( $echo = true ) {
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$ogdesc = '';
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if ( is_front_page() ) {
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if ( isset( $this->options['og_frontpage_desc'] ) )
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$ogdesc = $this->options['og_frontpage_desc'];
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}
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if ( is_singular() ) {
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$ogdesc = wpseo_get_value( 'opengraph-description' );
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if ( !$ogdesc )
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$ogdesc = $this->metadesc( false );
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// og:description is still blank so grab it from get_the_excerpt()
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if ( !$ogdesc )
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$ogdesc = strip_tags( get_the_excerpt() );
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}
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$ogdesc = apply_filters( 'wpseo_opengraph_desc', $ogdesc );
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if ( $ogdesc && $ogdesc != '' ) {
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if ( $echo !== false )
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echo "<meta property='og:description' content='" . esc_attr( $ogdesc ) . "'/>\n";
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else
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return $ogdesc;
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}
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}
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/**
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* Output the site name straight from the blog info.
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*/
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public function site_name() {
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echo "<meta property='og:site_name' content='" . esc_attr( get_bloginfo( 'name' ) ) . "'/>\n";
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}
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}
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global $wpseo_og;
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$wpseo_og = new WPSEO_OpenGraph; |