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<?php
/**
* @package WPSEO
* @subpackage Frontend
*/
/**
* This code adds the OpenGraph output.
*/
class WPSEO_OpenGraph {
/**
* @var array $options Options for the OpenGraph Settings
*/
public $options = array();
/**
* @var array $shown_images Holds the images that have been put out as OG image.
*/
public $shown_images = array();
/**
* Class constructor.
*/
public function __construct() {
$this->options = WPSEO_Options::get_all();
if ( isset( $GLOBALS['fb_ver'] ) || class_exists( 'Facebook_Loader' ) ) {
add_filter( 'fb_meta_tags', array( $this, 'facebook_filter' ), 10, 1 );
}
else {
add_filter( 'language_attributes', array( $this, 'add_opengraph_namespace' ) );
add_action( 'wpseo_opengraph', array( $this, 'locale' ), 1 );
add_action( 'wpseo_opengraph', array( $this, 'type' ), 5 );
add_action( 'wpseo_opengraph', array( $this, 'og_title' ), 10 );
add_action( 'wpseo_opengraph', array( $this, 'site_owner' ), 20 );
add_action( 'wpseo_opengraph', array( $this, 'description' ), 11 );
add_action( 'wpseo_opengraph', array( $this, 'url' ), 12 );
add_action( 'wpseo_opengraph', array( $this, 'site_name' ), 13 );
add_action( 'wpseo_opengraph', array( $this, 'website_facebook' ), 14 );
if ( is_singular() && ! is_front_page() ) {
add_action( 'wpseo_opengraph', array( $this, 'article_author_facebook' ), 15 );
add_action( 'wpseo_opengraph', array( $this, 'tags' ), 16 );
add_action( 'wpseo_opengraph', array( $this, 'category' ), 17 );
add_action( 'wpseo_opengraph', array( $this, 'publish_date' ), 19 );
}
add_action( 'wpseo_opengraph', array( $this, 'image' ), 30 );
}
add_filter( 'jetpack_enable_open_graph', '__return_false' );
add_action( 'wpseo_head', array( $this, 'opengraph' ), 30 );
}
/**
* Main OpenGraph output.
*/
public function opengraph() {
wp_reset_query();
/**
* Action: 'wpseo_opengraph' - Hook to add all Facebook OpenGraph output to so they're close together.
*/
do_action( 'wpseo_opengraph' );
}
/**
* Internal function to output FB tags. This also adds an output filter to each bit of output based on the property.
*
* @param string $property
* @param string $content
*
* @return boolean
*/
public function og_tag( $property, $content ) {
$og_property = str_replace( ':', '_', $property );
/**
* Filter: 'wpseo_og_' . $og_property - Allow developers to change the content of specific OG meta tags.
*
* @api string $content The content of the property
*/
$content = apply_filters( 'wpseo_og_' . $og_property, $content );
if ( empty( $content ) ) {
return false;
}
echo '<meta property="', esc_attr( $property ), '" content="', esc_attr( $content ), '" />', "\n";
return true;
}
/**
* Filter the Facebook plugins metadata
*
* @param array $meta_tags the array to fix.
*
* @return array $meta_tags
*/
public function facebook_filter( $meta_tags ) {
$meta_tags['http://ogp.me/ns#type'] = $this->type( false );
$meta_tags['http://ogp.me/ns#title'] = $this->og_title( false );
// Filter the locale too because the Facebook plugin locale code is not as good as ours.
$meta_tags['http://ogp.me/ns#locale'] = $this->locale( false );
$ogdesc = $this->description( false );
if ( ! empty( $ogdesc ) ) {
$meta_tags['http://ogp.me/ns#description'] = $ogdesc;
}
return $meta_tags;
}
/**
* Filter for the namespace, adding the OpenGraph namespace.
*
* @link https://developers.facebook.com/docs/web/tutorials/scrumptious/open-graph-object/
*
* @param string $input The input namespace string.
*
* @return string
*/
public function add_opengraph_namespace( $input ) {
return $input . ' prefix="og: http://ogp.me/ns#' . ( ( $this->options['fbadminapp'] != 0 || ( is_array( $this->options['fb_admins'] ) && $this->options['fb_admins'] !== array() ) ) ? ' fb: http://ogp.me/ns/fb#' : '' ) . '"';
}
/**
* Outputs the authors FB page.
*
* @link https://developers.facebook.com/blog/post/2013/06/19/platform-updates--new-open-graph-tags-for-media-publishers-and-more/
* @link https://developers.facebook.com/docs/reference/opengraph/object-type/article/
*
* @return boolean
*/
public function article_author_facebook() {
if ( ! is_singular() ) {
return false;
}
/**
* Filter: 'wpseo_opengraph_author_facebook' - Allow developers to filter the WP SEO post authors facebook profile URL
*
* @api bool|string $unsigned The Facebook author URL, return false to disable
*/
$facebook = apply_filters( 'wpseo_opengraph_author_facebook', get_the_author_meta( 'facebook', $GLOBALS['post']->post_author ) );
if ( $facebook && ( is_string( $facebook ) && $facebook !== '' ) ) {
$this->og_tag( 'article:author', $facebook );
return true;
}
return false;
}
/**
* Outputs the websites FB page.
*
* @link https://developers.facebook.com/blog/post/2013/06/19/platform-updates--new-open-graph-tags-for-media-publishers-and-more/
* @link https://developers.facebook.com/docs/reference/opengraph/object-type/article/
* @return boolean
*/
public function website_facebook() {
if ( $this->options['facebook_site'] !== '' ) {
$this->og_tag( 'article:publisher', $this->options['facebook_site'] );
return true;
}
return false;
}
/**
* Outputs the site owner
*
* @link https://developers.facebook.com/docs/reference/opengraph/object-type/article/
* @return boolean
*/
public function site_owner() {
if ( 0 != $this->options['fbadminapp'] ) {
$this->og_tag( 'fb:app_id', $this->options['fbadminapp'] );
return true;
}
elseif ( is_array( $this->options['fb_admins'] ) && $this->options['fb_admins'] !== array() ) {
$adminstr = implode( ',', array_keys( $this->options['fb_admins'] ) );
/**
* Filter: 'wpseo_opengraph_admin' - Allow developer to filter the fb:admins string put out by WP SEO
*
* @api string $adminstr The admin string
*/
$adminstr = apply_filters( 'wpseo_opengraph_admin', $adminstr );
if ( is_string( $adminstr ) && $adminstr !== '' ) {
$this->og_tag( 'fb:admins', $adminstr );
return true;
}
}
return false;
}
/**
* Outputs the SEO title as OpenGraph title.
*
* @link https://developers.facebook.com/docs/reference/opengraph/object-type/article/
*
* @param bool $echo Whether or not to echo the output.
*
* @return string|boolean
*/
public function og_title( $echo = true ) {
if ( is_singular() ) {
$title = WPSEO_Meta::get_value( 'opengraph-title' );
if ( $title === '' ) {
$title = WPSEO_Frontend::get_instance()->title( '' );
}
else {
// Replace WP SEO Variables
$title = wpseo_replace_vars( $title, get_post() );
}
}
else if ( is_front_page() ) {
$title = ( $this->options['og_frontpage_title'] !== '' ) ? $this->options['og_frontpage_title'] : WPSEO_Frontend::get_instance()->title( '' );
}
else {
$title = WPSEO_Frontend::get_instance()->title( '' );
}
/**
* Filter: 'wpseo_opengraph_title' - Allow changing the title specifically for OpenGraph
*
* @api string $unsigned The title string
*/
$title = trim( apply_filters( 'wpseo_opengraph_title', $title ) );
if ( is_string( $title ) && $title !== '' ) {
if ( $echo !== false ) {
$this->og_tag( 'og:title', $title );
return true;
}
}
if ( $echo === false ) {
return $title;
}
return false;
}
/**
* Outputs the canonical URL as OpenGraph URL, which consolidates likes and shares.
*
* @link https://developers.facebook.com/docs/reference/opengraph/object-type/article/
* @return boolean
*/
public function url() {
/**
* Filter: 'wpseo_opengraph_url' - Allow changing the OpenGraph URL
*
* @api string $unsigned Canonical URL
*/
$url = apply_filters( 'wpseo_opengraph_url', WPSEO_Frontend::get_instance()->canonical( false ) );
if ( is_string( $url ) && $url !== '' ) {
$this->og_tag( 'og:url', esc_url( $url ) );
return true;
}
return false;
}
/**
* Output the locale, doing some conversions to make sure the proper Facebook locale is outputted.
*
* Last update/compare with FB list done on 2015-03-16 by Rarst
* @see http://www.facebook.com/translations/FacebookLocales.xml for the list of supported locales
*
* @link https://developers.facebook.com/docs/reference/opengraph/object-type/article/
*
* @param bool $echo Whether to echo or return the locale
*
* @return string $locale
*/
public function locale( $echo = true ) {
/**
* Filter: 'wpseo_locale' - Allow changing the locale output
*
* @api string $unsigned Locale string
*/
$locale = apply_filters( 'wpseo_locale', get_locale() );
// catch some weird locales served out by WP that are not easily doubled up.
$fix_locales = array(
'ca' => 'ca_ES',
'en' => 'en_US',
'el' => 'el_GR',
'et' => 'et_EE',
'ja' => 'ja_JP',
'sq' => 'sq_AL',
'uk' => 'uk_UA',
'vi' => 'vi_VN',
'zh' => 'zh_CN',
);
if ( isset( $fix_locales[ $locale ] ) ) {
$locale = $fix_locales[ $locale ];
}
// convert locales like "es" to "es_ES", in case that works for the given locale (sometimes it does)
if ( strlen( $locale ) == 2 ) {
$locale = strtolower( $locale ) . '_' . strtoupper( $locale );
}
// These are the locales FB supports
$fb_valid_fb_locales = array(
'af_ZA', // Afrikaans
'ar_AR', // Arabic
'az_AZ', // Azerbaijani
'be_BY', // Belarusian
'bg_BG', // Bulgarian
'bn_IN', // Bengali
'bs_BA', // Bosnian
'ca_ES', // Catalan
'cs_CZ', // Czech
'cx_PH', // Cebuano
'cy_GB', // Welsh
'da_DK', // Danish
'de_DE', // German
'el_GR', // Greek
'en_GB', // English (UK)
'en_PI', // English (Pirate)
'en_UD', // English (Upside Down)
'en_US', // English (US)
'eo_EO', // Esperanto
'es_ES', // Spanish (Spain)
'es_LA', // Spanish
'et_EE', // Estonian
'eu_ES', // Basque
'fa_IR', // Persian
'fb_LT', // Leet Speak
'fi_FI', // Finnish
'fo_FO', // Faroese
'fr_CA', // French (Canada)
'fr_FR', // French (France)
'fy_NL', // Frisian
'ga_IE', // Irish
'gl_ES', // Galician
'gn_PY', // Guarani
'gu_IN', // Gujarati
'he_IL', // Hebrew
'hi_IN', // Hindi
'hr_HR', // Croatian
'hu_HU', // Hungarian
'hy_AM', // Armenian
'id_ID', // Indonesian
'is_IS', // Icelandic
'it_IT', // Italian
'ja_JP', // Japanese
'ja_KS', // Japanese (Kansai)
'jv_ID', // Javanese
'ka_GE', // Georgian
'kk_KZ', // Kazakh
'km_KH', // Khmer
'kn_IN', // Kannada
'ko_KR', // Korean
'ku_TR', // Kurdish
'la_VA', // Latin
'lt_LT', // Lithuanian
'lv_LV', // Latvian
'mk_MK', // Macedonian
'ml_IN', // Malayalam
'mn_MN', // Mongolian
'mr_IN', // Marathi
'ms_MY', // Malay
'nb_NO', // Norwegian (bokmal)
'ne_NP', // Nepali
'nl_NL', // Dutch
'nn_NO', // Norwegian (nynorsk)
'pa_IN', // Punjabi
'pl_PL', // Polish
'ps_AF', // Pashto
'pt_BR', // Portuguese (Brazil)
'pt_PT', // Portuguese (Portugal)
'ro_RO', // Romanian
'ru_RU', // Russian
'si_LK', // Sinhala
'sk_SK', // Slovak
'sl_SI', // Slovenian
'sq_AL', // Albanian
'sr_RS', // Serbian
'sv_SE', // Swedish
'sw_KE', // Swahili
'ta_IN', // Tamil
'te_IN', // Telugu
'tg_TJ', // Tajik
'th_TH', // Thai
'tl_PH', // Filipino
'tr_TR', // Turkish
'uk_UA', // Ukrainian
'ur_PK', // Urdu
'uz_UZ', // Uzbek
'vi_VN', // Vietnamese
'zh_CN', // Simplified Chinese (China)
'zh_HK', // Traditional Chinese (Hong Kong)
'zh_TW', // Traditional Chinese (Taiwan)
);
// check to see if the locale is a valid FB one, if not, use en_US as a fallback
if ( ! in_array( $locale, $fb_valid_fb_locales ) ) {
$locale = strtolower( substr( $locale, 0, 2 ) ) . '_' . strtoupper( substr( $locale, 0, 2 ) );
if ( ! in_array( $locale, $fb_valid_fb_locales ) ) {
$locale = 'en_US';
}
}
if ( $echo !== false ) {
$this->og_tag( 'og:locale', $locale );
}
return $locale;
}
/**
* Output the OpenGraph type.
*
* @param boolean $echo Whether to echo or return the type
*
* @link https://developers.facebook.com/docs/reference/opengraph/object-type/object/
*
* @return string $type
*/
public function type( $echo = true ) {
if ( is_front_page() || is_home() ) {
$type = 'website';
}
elseif ( is_singular() ) {
// This'll usually only be changed by plugins right now.
$type = WPSEO_Meta::get_value( 'og_type' );
if ( $type === '' ) {
$type = 'article';
}
}
else {
// We use "object" for archives etc. as article doesn't apply there
$type = 'object';
}
/**
* Filter: 'wpseo_opengraph_type' - Allow changing the OpenGraph type of the page
*
* @api string $type The OpenGraph type string.
*/
$type = apply_filters( 'wpseo_opengraph_type', $type );
if ( is_string( $type ) && $type !== '' ) {
if ( $echo !== false ) {
$this->og_tag( 'og:type', $type );
}
else {
return $type;
}
}
return '';
}
/**
* Display an OpenGraph image tag
*
* @param string $img Source URL to the image
*
* @return bool
*/
public function image_output( $img ) {
/**
* Filter: 'wpseo_opengraph_image' - Allow changing the OpenGraph image
*
* @api string $img Image URL string
*/
$img = trim( apply_filters( 'wpseo_opengraph_image', $img ) );
if ( empty( $img ) ) {
return false;
}
if ( WPSEO_Utils::is_url_relative( $img ) === true ) {
if ( $img[0] != '/' ) {
return false;
}
// If it's a relative URL, it's relative to the domain, not necessarily to the WordPress install, we
// want to preserve domain name and URL scheme (http / https) though.
$parsed_url = parse_url( home_url() );
$img = $parsed_url['scheme'] . '://' . $parsed_url['host'] . $img;
}
if ( in_array( $img, $this->shown_images ) ) {
return false;
}
array_push( $this->shown_images, $img );
$this->og_tag( 'og:image', esc_url( $img ) );
return true;
}
/**
* Output the OpenGraph image elements for all the images within the current post/page.
*
* @return void
*/
public function image() {
global $post;
if ( is_front_page() ) {
if ( $this->options['og_frontpage_image'] !== '' ) {
$this->image_output( $this->options['og_frontpage_image'] );
}
}
if ( is_singular() ) {
$ogimg = WPSEO_Meta::get_value( 'opengraph-image' );
if ( $ogimg !== '' ) {
$this->image_output( $ogimg );
return;
}
if ( function_exists( 'has_post_thumbnail' ) && has_post_thumbnail( $post->ID ) ) {
/**
* Filter: 'wpseo_opengraph_image_size' - Allow changing the image size used for OpenGraph sharing
*
* @api string $unsigned Size string
*/
$thumb = wp_get_attachment_image_src( get_post_thumbnail_id( $post->ID ), apply_filters( 'wpseo_opengraph_image_size', 'original' ) );
$this->image_output( $thumb[0] );
return;
}
/**
* Filter: 'wpseo_pre_analysis_post_content' - Allow filtering the content before analysis
*
* @api string $post_content The Post content string
*
* @param object $post The post object.
*/
$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] );
}
unset( $match );
}
}
unset( $img, $matches );
}
if ( count( $this->shown_images ) == 0 && $this->options['og_default_image'] !== '' ) {
$this->image_output( $this->options['og_default_image'] );
}
}
/**
* Output the OpenGraph description, specific OG description first, if not, grab the meta description.
*
* @param bool $echo Whether to echo or return the description
*
* @return string $ogdesc
*/
public function description( $echo = true ) {
$ogdesc = '';
if ( is_front_page() ) {
if ( $this->options['og_frontpage_desc'] !== '' ) {
$ogdesc = wpseo_replace_vars( $this->options['og_frontpage_desc'], null );
}
else {
$ogdesc = WPSEO_Frontend::get_instance()->metadesc( false );
}
}
if ( is_singular() ) {
$ogdesc = WPSEO_Meta::get_value( 'opengraph-description' );
// Replace WP SEO Variables
$ogdesc = wpseo_replace_vars( $ogdesc, get_post() );
// Use metadesc if $ogdesc is empty
if ( $ogdesc === '' ) {
$ogdesc = WPSEO_Frontend::get_instance()->metadesc( false );
}
// og:description is still blank so grab it from get_the_excerpt()
if ( ! is_string( $ogdesc ) || ( is_string( $ogdesc ) && $ogdesc === '' ) ) {
$ogdesc = str_replace( '[…]', '…', strip_tags( get_the_excerpt() ) );
}
}
if ( is_category() || is_tag() || is_tax() ) {
$ogdesc = WPSEO_Frontend::get_instance()->metadesc( false );
if ( '' == $ogdesc ) {
$ogdesc = trim( strip_tags( term_description() ) );
}
if ( '' == $ogdesc ) {
$term = $GLOBALS['wp_query']->get_queried_object();
$ogdesc = WPSEO_Taxonomy_Meta::get_term_meta( $term, $term->taxonomy, 'desc' );
}
}
// Strip shortcodes if any
$ogdesc = strip_shortcodes( $ogdesc );
/**
* Filter: 'wpseo_opengraph_desc' - Allow changing the OpenGraph description
*
* @api string $ogdesc The description string.
*/
$ogdesc = trim( apply_filters( 'wpseo_opengraph_desc', $ogdesc ) );
if ( is_string( $ogdesc ) && $ogdesc !== '' ) {
if ( $echo !== false ) {
$this->og_tag( 'og:description', $ogdesc );
}
}
return $ogdesc;
}
/**
* Output the site name straight from the blog info.
*/
public function site_name() {
/**
* Filter: 'wpseo_opengraph_site_name' - Allow changing the OpenGraph site name
*
* @api string $unsigned Blog name string
*/
$name = apply_filters( 'wpseo_opengraph_site_name', get_bloginfo( 'name' ) );
if ( is_string( $name ) && $name !== '' ) {
$this->og_tag( 'og:site_name', $name );
}
}
/**
* Output the article tags as article:tag tags.
*
* @link https://developers.facebook.com/docs/reference/opengraph/object-type/article/
* @return boolean
*/
public function tags() {
if ( ! is_singular() ) {
return false;
}
$tags = get_the_tags();
if ( ! is_wp_error( $tags ) && ( is_array( $tags ) && $tags !== array() ) ) {
$tags_out = '';
foreach ( $tags as $tag ) {
$tags_out .= $tag->name . ',';
}
$tags_out = rtrim( $tags_out, ',' );
$this->og_tag( 'article:tag', $tags_out );
return true;
}
return false;
}
/**
* Output the article category as an article:section tag.
*
* @link https://developers.facebook.com/docs/reference/opengraph/object-type/article/
* @return boolean;
*/
public function category() {
if ( ! is_singular() ) {
return false;
}
$terms = get_the_category();
if ( ! is_wp_error( $terms ) && ( is_array( $terms ) && $terms !== array() ) ) {
// We can only show one section here, so we take the first one.
$this->og_tag( 'article:section', $terms[0]->name );
return true;
}
return false;
}
/**
* Output the article publish and last modification date
*
* @link https://developers.facebook.com/docs/reference/opengraph/object-type/article/
* @return boolean;
*/
public function publish_date() {
if ( ! is_singular( 'post' ) ) {
/**
* Filter: 'wpseo_opengraph_show_publish_date' - Allow showing publication date for other post types
*
* @api bool $unsigned Whether or not to show publish date
*
* @param string $post_type The current URL's post type.
*/
if ( false === apply_filters( 'wpseo_opengraph_show_publish_date', false, get_post_type() ) ) {
return false;
}
}
$pub = get_the_date( 'c' );
$this->og_tag( 'article:published_time', $pub );
$mod = get_the_modified_date( 'c' );
if ( $mod != $pub ) {
$this->og_tag( 'article:modified_time', $mod );
$this->og_tag( 'og:updated_time', $mod );
}
return true;
}
} /* End of class */
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