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<?php
/**
* Class CFF_Oembed
*
* Replaces the native WordPress functionality for Facebook oembed
* to allow authenticated oembeds
*
* @since 2.16/3.16
*/
namespace CustomFacebookFeed;
if ( ! defined( 'ABSPATH' ) ) {
die( '-1' );
}
class CFF_Oembed
{
/**
* CFF_Oembed constructor.
*
* If an account has been connected, hooks are added
* to change how Facebook links are handled for oembeds
*
* @since 2.16/3.16
*/
public function __construct() {
if ( CFF_Oembed::can_do_oembed() ) {
if ( CFF_Oembed::can_check_for_old_oembeds() ) {
add_action( 'the_post', array( 'CustomFacebookFeed\CFF_Oembed', 'check_page_for_old_oembeds' ) );
}
add_filter( 'oembed_providers', array( 'CustomFacebookFeed\CFF_Oembed', 'oembed_providers' ), 10, 1 );
add_filter( 'oembed_fetch_url', array( 'CustomFacebookFeed\CFF_Oembed', 'oembed_set_fetch_url' ), 10, 3 );
add_filter( 'oembed_result', array( 'CustomFacebookFeed\CFF_Oembed', 'oembed_result' ), 10, 3 );
}
if ( CFF_Oembed::should_extend_ttl() ) {
add_filter( 'oembed_ttl', array( 'CustomFacebookFeed\CFF_Oembed', 'oembed_ttl' ), 10, 4 );
}
}
/**
* Check to make sure there is a saved access token to
* enable authenticated oembeds
*
* @return bool
*
* @since 2.16/3.16
*/
public static function can_do_oembed() {
$oembed_token_settings = get_option( 'cff_oembed_token', array() );
if ( isset( $oembed_token_settings['disabled'] ) && $oembed_token_settings['disabled'] ) {
return false;
}
$access_token = CFF_Oembed::last_access_token();
if ( ! $access_token ) {
return false;
}
return true;
}
/**
* The "time to live" for Instagram oEmbeds is extended if the access token expires.
* Even if new oEmbeds will not use the Instagram Feed system due to an expired token
* the time to live should continue to be extended.
*
* @return bool
*
* @since 2.16/3.16
*/
public static function should_extend_ttl() {
$oembed_token_settings = get_option( 'cff_oembed_token', array() );
if ( isset( $oembed_token_settings['disabled'] ) && $oembed_token_settings['disabled'] ) {
return false;
}
$will_expire = CFF_Oembed::oembed_access_token_will_expire();
if ( $will_expire ) {
return true;
}
return false;
}
/**
* Checking for old oembeds makes permanent changes to posts
* so we want the user to turn it off and on
*
* @return bool
*
* @since 2.16/3.16
*/
public static function can_check_for_old_oembeds() {
/**
* TODO: if setting is enabled
*/
return true;
}
/**
* Filters the WordPress list of oembed providers to
* change what url is used for remote requests for the
* oembed data
*
* @param array $providers
*
* @return mixed
*
* @since 2.16/3.16
*/
public static function oembed_providers( $providers ) {
$oembed_url = CFF_Oembed::oembed_url();
if ( $oembed_url ) {
$post_embed_providers = CFF_Oembed::post_providers();
foreach ( $post_embed_providers as $post_provider ) {
$providers[ $post_provider ] = array( $oembed_url . 'oembed_post', true );
}
$video_embed_providers = CFF_Oembed::video_providers();
foreach ( $video_embed_providers as $video_provider ) {
$providers[ $video_provider ] = array( $oembed_url . 'oembed_video', true );
}
}
return $providers;
}
/**
* Add the access token from a connected account to make an authenticated
* call to get oembed data from Facebook
*
* @param string $provider
* @param string $url
* @param array $args
*
* @return string
*
* @since 2.16/3.16
*/
public static function oembed_set_fetch_url( $provider, $url, $args ) {
$access_token = CFF_Oembed::last_access_token();
if ( ! $access_token ) {
return $provider;
}
if ( strpos( $provider, 'oembed_post' ) !== false
|| strpos( $provider, 'oembed_video' ) !== false ) {
if ( strpos( $url, '?' ) !== false ) {
$provider = self::get_provider_from_url_with_query_vars( $provider, $url );
}
$provider = add_query_arg( 'access_token', $access_token, $provider );
}
return $provider;
}
/**
* URLs with query variables are handled specially
*
* @param $provider
* @param $url
*
* @return array|mixed|string|string[]
*/
public static function get_provider_from_url_with_query_vars( $provider, $url ) {
$exploded = explode( '?', $url );
if ( ! empty( $exploded[1] ) ) {
if ( strpos( $url, '?v=' ) !== false ) {
$exploded = explode( '&', $url );
$provider = str_replace( urlencode( '&' . $exploded[1] ), '', $provider );
}
}
return $provider;
}
/**
* New oembeds are wrapped in a div for easy detection of older oembeds
* that will need to be updated
*
* @param string $html
* @param string $url
* @param array $args
*
* @return string
*
* @since 2.16/3.16
*/
public static function oembed_result( $html, $url, $args ) {
$post_embed_providers = CFF_Oembed::post_providers();
foreach ( $post_embed_providers as $post_provider ) {
if ( preg_match( $post_provider, $url ) === 1 ) {
if ( strpos( $html, 'class="fb-post"' ) !== false ) {
$html = '<div class="cff-embed-wrap cff-post-embed-wrap">' . str_replace( 'class="fb-post"', 'class="fb-post cff-embed cff-post-embed"', $html ) . '</div>';
}
}
}
$video_embed_providers = CFF_Oembed::video_providers();
foreach ( $video_embed_providers as $video_provider ) {
if ( preg_match( $video_provider, $url ) === 1 ) {
if ( strpos( $html, 'class="fb-video"' ) !== false ) {
$html = '<div class="cff-embed-wrap cff-video-embed-wrap">' . str_replace( 'class="fb-video"', 'class="fb-video cff-embed cff-video-embed"', $html ) . '</div>';
}
}
}
return $html;
}
/**
* Extend the "time to live" for oEmbeds created with access tokens that expire
*
* @param $ttl
* @param $url
* @param $attr
* @param $post_ID
*
* @return float|int
*
* @since 2.16/3.16
*/
public static function oembed_ttl( $ttl, $url, $attr, $post_ID ) {
$providers = CFF_Oembed::post_providers();
foreach ( $providers as $provider ) {
if ( preg_match( $provider, $url ) === 1 ) {
$ttl = 30 * YEAR_IN_SECONDS;
}
}
$providers = CFF_Oembed::video_providers();
foreach ( $providers as $provider ) {
if ( preg_match( $provider, $url ) === 1 ) {
$ttl = 30 * YEAR_IN_SECONDS;
}
}
return $ttl;
}
/**
* Only one api URL for FB
*
* @return bool|string
*
* @since 2.16/3.16
*/
public static function oembed_url() {
return 'https://graph.facebook.com/';
}
/**
* Any access token will work for oembeds so the access token
* saved in settings is used
*
* @return bool|string
*
* @since 2.16/3.16
*/
public static function last_access_token() {
$oembed_token_settings = get_option( 'cff_oembed_token', array() );
$will_expire = CFF_Oembed::oembed_access_token_will_expire();
$encryption = new \CustomFacebookFeed\SB_Facebook_Data_Encryption();
if ( ! empty( $oembed_token_settings['access_token'] )
&& (! $will_expire || $will_expire > time()) ) {
$oembed_token_settings['access_token'] = $encryption->maybe_decrypt( $oembed_token_settings['access_token'] );
return str_replace(":", ":02Sb981f26534g75h091287a46p5l63", $oembed_token_settings['access_token']);
} else {
$settings_access_token = trim(get_option('cff_access_token'));
$settings_access_token = $encryption->maybe_decrypt( $settings_access_token );
if ( ! empty( $settings_access_token ) ) {
return str_replace(":", ":02Sb981f26534g75h091287a46p5l63", $settings_access_token);
}
if ( class_exists( 'SB_Instagram_Oembed' ) ) {
$sbi_oembed_token_settings = get_option( 'sbi_oembed_token', array() );
if ( ! empty( $sbi_oembed_token_settings['access_token'] ) ) {
$sbi_oembed_token_settings['access_token'] = $encryption->maybe_decrypt( $sbi_oembed_token_settings['access_token'] );
return $sbi_oembed_token_settings['access_token'];
}
}
}
return false;
}
/**
* Access tokens created from FB accounts not connected to an
* FB page expire after 60 days.
*
* @return bool|int
*/
public static function oembed_access_token_will_expire() {
$oembed_token_settings = get_option( 'cff_oembed_token', array() );
$will_expire = isset( $oembed_token_settings['expiration_date'] ) && (int)$oembed_token_settings['expiration_date'] > 0 ? (int)$oembed_token_settings['expiration_date'] : false;
return $will_expire;
}
/**
* Before links in the content are processed, old oembed post meta
* records are deleted so new oembed data will be retrieved and saved.
* If this check has been done and no old oembeds are found, a flag
* is saved as post meta to skip the process.
*
* @since 2.16/3.16
*/
public static function check_page_for_old_oembeds() {
if ( is_admin() ) {
return;
}
$post_ID = get_the_ID();
$done_checking = (int)get_post_meta( $post_ID, '_cff_oembed_done_checking', true ) === 1;
if ( ! $done_checking ) {
$num_found = CFF_Oembed::delete_facebook_oembed_caches( $post_ID );
if ( $num_found === 0 ) {
update_post_meta( $post_ID, '_cff_oembed_done_checking', 1 );
}
}
}
/**
* Loop through post meta data and if it's an oembed and has content
* that looks like a Facebook oembed, delete it
*
* @param $post_ID
*
* @return int number of old oembed caches found
*
* @since 2.16/3.16
*/
public static function delete_facebook_oembed_caches( $post_ID ) {
$post_metas = get_post_meta( $post_ID );
if ( empty( $post_metas ) ) {
return 0;
}
$total_found = 0;
foreach ( $post_metas as $post_meta_key => $post_meta_value ) {
if ( '_oembed_' === substr( $post_meta_key, 0, 8 ) ) {
if ( strpos( $post_meta_value[0], 'class="fb-post"' ) !== false
&& strpos( $post_meta_value[0], 'cff-embed-wrap' ) === false ) {
$total_found++;
delete_post_meta( $post_ID, $post_meta_key );
if ( '_oembed_time_' !== substr( $post_meta_key, 0, 13 ) ) {
delete_post_meta( $post_ID, str_replace( '_oembed_', '_oembed_time_', $post_meta_key ) );
}
} elseif ( strpos( $post_meta_value[0], 'class="fb-video"' ) !== false
&& strpos( $post_meta_value[0], 'cff-embed-wrap' ) === false ) {
$total_found++;
delete_post_meta( $post_ID, $post_meta_key );
if ( '_oembed_time_' !== substr( $post_meta_key, 0, 13 ) ) {
delete_post_meta( $post_ID, str_replace( '_oembed_', '_oembed_time_', $post_meta_key ) );
}
}
}
}
return $total_found;
}
/**
* Current list of regex to identify FB URLs that could become oembeds using
* the 'oembed_post' endpoint.
*
* @return array
*
* @since 2.16/3.16
*/
public static function post_providers() {
$post_embed_providers = array(
'#https?://www\.facebook\.com/.*/posts/.*#i',
'#https?://www\.facebook\.com/.*/activity/.*#i',
'#https?://www\.facebook\.com/.*/photos/.*#i',
'#https?://www\.facebook\.com/photo(s/|\.php).*#i',
'#https?://www\.facebook\.com/permalink\.php.*#i',
'#https?://www\.facebook\.com/media/.*#i',
'#https?://www\.facebook\.com/questions/.*#i',
'#https?://www\.facebook\.com/notes/.*#i',
);
return $post_embed_providers;
}
/**
* Current list of regex to identify FB URLs that could become oembeds using
* the 'oembed_video' endpoint.
*
* @return array
*
* @since 2.16/3.16
*/
public static function video_providers() {
$video_embed_providers = array(
'#https?://www\.facebook\.com/.*/videos/.*#i',
'#https?://www\.facebook\.com/video\.php.*#i',
'#https?://www\.facebook\.com/watch/.*#i',
'#https?://fb\.watch/.*#i'
);
return $video_embed_providers;
}
/**
* Used for clearing the oembed update check flag for all posts
*
* @since 2.16/3.16
*/
public static function clear_checks() {
global $wpdb;
$table_name = esc_sql( $wpdb->prefix . "postmeta" );
$result = $wpdb->query("
DELETE
FROM $table_name
WHERE meta_key = '_cff_oembed_done_checking';");
}
}
/*
function cffOembedInit() {
return new CFF_Oembed();
}
cffOembedInit();
*/