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<?php
/**
* CMB2 ajax methods
* (i.e. a lot of work to get oEmbeds to work with non-post objects)
*
* @since 0.9.5
*
* @category WordPress_Plugin
* @package CMB2
* @author CMB2 team
* @license GPL-2.0+
*/
class CMB2_Ajax {
// Whether to hijack the oembed cache system
protected $hijack = false;
protected $object_id = 0;
protected $embed_args = array();
protected $object_type = 'post';
protected $ajax_update = false;
/**
* Instance of this class
*
* @since 2.2.2
* @var object
*/
protected static $instance;
/**
* Get the singleton instance of this class
*
* @since 2.2.2
* @return CMB2_Ajax
*/
public static function get_instance() {
if ( ! ( self::$instance instanceof self ) ) {
self::$instance = new self();
}
return self::$instance;
}
/**
* Constructor
*
* @since 2.2.0
*/
protected function __construct() {
add_action( 'wp_ajax_cmb2_oembed_handler', array( $this, 'oembed_handler' ) );
add_action( 'wp_ajax_nopriv_cmb2_oembed_handler', array( $this, 'oembed_handler' ) );
// Need to occasionally clean stale oembed cache data from the option value.
add_action( 'cmb2_save_options-page_fields', array( __CLASS__, 'clean_stale_options_page_oembeds' ) );
}
/**
* Handles our oEmbed ajax request
*
* @since 0.9.5
* @return object oEmbed embed code | fallback | error message
*/
public function oembed_handler() {
// Verify our nonce
if ( ! ( isset( $_REQUEST['cmb2_ajax_nonce'], $_REQUEST['oembed_url'] ) && wp_verify_nonce( $_REQUEST['cmb2_ajax_nonce'], 'ajax_nonce' ) ) ) {
die();
}
// Sanitize our search string
$oembed_string = sanitize_text_field( $_REQUEST['oembed_url'] );
// Send back error if empty
if ( empty( $oembed_string ) ) {
wp_send_json_error( '<p class="ui-state-error-text">' . esc_html__( 'Please Try Again', 'cmb2' ) . '</p>' );
}
// Set width of embed
$embed_width = isset( $_REQUEST['oembed_width'] ) && intval( $_REQUEST['oembed_width'] ) < 640 ? intval( $_REQUEST['oembed_width'] ) : '640';
// Set url
$oembed_url = esc_url( $oembed_string );
// Set args
$embed_args = array(
'width' => $embed_width,
);
$this->ajax_update = true;
// Get embed code (or fallback link)
$html = $this->get_oembed( array(
'url' => $oembed_url,
'object_id' => $_REQUEST['object_id'],
'object_type' => isset( $_REQUEST['object_type'] ) ? $_REQUEST['object_type'] : 'post',
'oembed_args' => $embed_args,
'field_id' => $_REQUEST['field_id'],
) );
wp_send_json_success( $html );
}
/**
* Retrieves oEmbed from url/object ID
*
* @since 0.9.5
* @param array $args Arguments for method
* @return string html markup with embed or fallback
*/
public function get_oembed_no_edit( $args ) {
global $wp_embed;
$oembed_url = esc_url( $args['url'] );
// Sanitize object_id
$this->object_id = is_numeric( $args['object_id'] ) ? absint( $args['object_id'] ) : sanitize_text_field( $args['object_id'] );
$args = wp_parse_args( $args, array(
'object_type' => 'post',
'oembed_args' => array(),
'field_id' => false,
'wp_error' => false,
) );
$this->embed_args =& $args;
/*
* Set the post_ID so oEmbed won't fail
* wp-includes/class-wp-embed.php, WP_Embed::shortcode()
*/
$wp_embed->post_ID = $this->object_id;
// Special scenario if NOT a post object
if ( isset( $args['object_type'] ) && 'post' != $args['object_type'] ) {
if ( 'options-page' == $args['object_type'] ) {
// Bogus id to pass some numeric checks. Issue with a VERY large WP install?
$wp_embed->post_ID = 1987645321;
}
// Ok, we need to hijack the oembed cache system
$this->hijack = true;
$this->object_type = $args['object_type'];
// Gets ombed cache from our object's meta (vs postmeta)
add_filter( 'get_post_metadata', array( $this, 'hijack_oembed_cache_get' ), 10, 3 );
// Sets ombed cache in our object's meta (vs postmeta)
add_filter( 'update_post_metadata', array( $this, 'hijack_oembed_cache_set' ), 10, 4 );
}
$embed_args = '';
foreach ( $args['oembed_args'] as $key => $val ) {
$embed_args .= " $key=\"$val\"";
}
// Ping WordPress for an embed
$embed = $wp_embed->run_shortcode( '[embed' . $embed_args . ']' . $oembed_url . '[/embed]' );
// Fallback that WordPress creates when no oEmbed was found
$fallback = $wp_embed->maybe_make_link( $oembed_url );
return compact( 'embed', 'fallback', 'args' );
}
/**
* Retrieves oEmbed from url/object ID
*
* @since 0.9.5
* @param array $args Arguments for method
* @return string html markup with embed or fallback
*/
public function get_oembed( $args ) {
$oembed = $this->get_oembed_no_edit( $args );
// Send back our embed
if ( $oembed['embed'] && $oembed['embed'] != $oembed['fallback'] ) {
return '<div class="cmb2-oembed embed-status">' . $oembed['embed'] . '<p class="cmb2-remove-wrapper"><a href="#" class="cmb2-remove-file-button" rel="' . $oembed['args']['field_id'] . '">' . esc_html__( 'Remove Embed', 'cmb2' ) . '</a></p></div>';
}
// Otherwise, send back error info that no oEmbeds were found
return sprintf(
'<p class="ui-state-error-text">%s</p>',
sprintf(
/* translators: 1: results for. 2: link to codex.wordpress.org/Embeds */
esc_html__( 'No oEmbed Results Found for %1$s. View more info at %2$s.', 'cmb2' ),
$oembed['fallback'],
'<a href="https://codex.wordpress.org/Embeds" target="_blank">codex.wordpress.org/Embeds</a>'
)
);
}
/**
* Hijacks retrieving of cached oEmbed.
* Returns cached data from relevant object metadata (vs postmeta)
*
* @since 0.9.5
* @param boolean $check Whether to retrieve postmeta or override
* @param int $object_id Object ID
* @param string $meta_key Object metakey
* @return mixed Object's oEmbed cached data
*/
public function hijack_oembed_cache_get( $check, $object_id, $meta_key ) {
if ( ! $this->hijack || ( $this->object_id != $object_id && 1987645321 !== $object_id ) ) {
return $check;
}
if ( $this->ajax_update ) {
return false;
}
return $this->cache_action( $meta_key );
}
/**
* Hijacks saving of cached oEmbed.
* Saves cached data to relevant object metadata (vs postmeta)
*
* @since 0.9.5
* @param boolean $check Whether to continue setting postmeta
* @param int $object_id Object ID to get postmeta from
* @param string $meta_key Postmeta's key
* @param mixed $meta_value Value of the postmeta to be saved
* @return boolean Whether to continue setting
*/
public function hijack_oembed_cache_set( $check, $object_id, $meta_key, $meta_value ) {
if (
! $this->hijack
|| ( $this->object_id != $object_id && 1987645321 !== $object_id )
// only want to hijack oembed meta values
|| 0 !== strpos( $meta_key, '_oembed_' )
) {
return $check;
}
$this->cache_action( $meta_key, $meta_value );
// Anything other than `null` to cancel saving to postmeta
return true;
}
/**
* Gets/updates the cached oEmbed value from/to relevant object metadata (vs postmeta)
*
* @since 1.3.0
* @param string $meta_key Postmeta's key
*/
protected function cache_action( $meta_key ) {
$func_args = func_get_args();
$action = isset( $func_args[1] ) ? 'update' : 'get';
if ( 'options-page' === $this->object_type ) {
$args = array( $meta_key );
if ( 'update' === $action ) {
$args[] = $func_args[1];
$args[] = true;
}
// Cache the result to our options
$status = call_user_func_array( array( cmb2_options( $this->object_id ), $action ), $args );
} else {
$args = array( $this->object_type, $this->object_id, $meta_key );
$args[] = 'update' === $action ? $func_args[1] : true;
// Cache the result to our metadata
$status = call_user_func_array( $action . '_metadata', $args );
}
return $status;
}
/**
* Hooks in when options-page data is saved to clean stale
* oembed cache data from the option value.
*
* @since 2.2.0
* @param string $option_key The options-page option key
* @return void
*/
public static function clean_stale_options_page_oembeds( $option_key ) {
$options = cmb2_options( $option_key )->get_options();
$modified = false;
if ( is_array( $options ) ) {
$ttl = apply_filters( 'oembed_ttl', DAY_IN_SECONDS, '', array(), 0 );
$now = time();
foreach ( $options as $key => $value ) {
// Check for cached oembed data
if ( 0 === strpos( $key, '_oembed_time_' ) ) {
$cached_recently = ( $now - $value ) < $ttl;
if ( ! $cached_recently ) {
$modified = true;
// Remove the the cached ttl expiration, and the cached oembed value.
unset( $options[ $key ] );
unset( $options[ str_replace( '_oembed_time_', '_oembed_', $key ) ] );
}
} // End if().
// Remove the cached unknown values.
elseif ( '{{unknown}}' === $value ) {
$modified = true;
unset( $options[ $key ] );
}
}
}
// Update the option and remove stale cache data
if ( $modified ) {
$updated = cmb2_options( $option_key )->set( $options );
}
}
}