WordPress/wp-includes/embed-functions.php

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<?php
/**
* WordPress API for embedding content.
*
* @package WordPress
* @subpackage oEmbed
* @since 4.4.0
*/
/**
* Registers an embed handler.
*
* Should probably only be used for sites that do not support oEmbed.
*
* @since 2.9.0
*
* @global WP_Embed $wp_embed
*
* @param string $id An internal ID/name for the handler. Needs to be unique.
* @param string $regex The regex that will be used to see if this handler should be used for a URL.
* @param callable $callback The callback function that will be called if the regex is matched.
* @param int $priority Optional. Used to specify the order in which the registered handlers will
* be tested. Default 10.
*/
function wp_embed_register_handler( $id, $regex, $callback, $priority = 10 ) {
global $wp_embed;
$wp_embed->register_handler( $id, $regex, $callback, $priority );
}
/**
* Unregisters a previously-registered embed handler.
*
* @since 2.9.0
*
* @global WP_Embed $wp_embed
*
* @param string $id The handler ID that should be removed.
* @param int $priority Optional. The priority of the handler to be removed. Default 10.
*/
function wp_embed_unregister_handler( $id, $priority = 10 ) {
global $wp_embed;
$wp_embed->unregister_handler( $id, $priority );
}
/**
* Create default array of embed parameters.
*
* The width defaults to the content width as specified by the theme. If the
* theme does not specify a content width, then 500px is used.
*
* The default height is 1.5 times the width, or 1000px, whichever is smaller.
*
* The 'embed_defaults' filter can be used to adjust either of these values.
*
* @since 2.9.0
*
* @global int $content_width
*
* @param string $url Optional. The URL that should be embedded. Default empty.
*
* @return array Default embed parameters.
*/
function wp_embed_defaults( $url = '' ) {
if ( ! empty( $GLOBALS['content_width'] ) )
$width = (int) $GLOBALS['content_width'];
if ( empty( $width ) )
$width = 500;
$height = min( ceil( $width * 1.5 ), 1000 );
/**
* Filter the default array of embed dimensions.
*
* @since 2.9.0
*
* @param int $width Width of the embed in pixels.
* @param int $height Height of the embed in pixels.
* @param string $url The URL that should be embedded.
*/
return apply_filters( 'embed_defaults', compact( 'width', 'height' ), $url );
}
/**
* Attempts to fetch the embed HTML for a provided URL using oEmbed.
*
* @since 2.9.0
*
* @see WP_oEmbed
*
* @param string $url The URL that should be embedded.
* @param array $args Optional. Additional arguments and parameters for retrieving embed HTML.
* Default empty.
* @return false|string False on failure or the embed HTML on success.
*/
function wp_oembed_get( $url, $args = '' ) {
require_once( ABSPATH . WPINC . '/class-oembed.php' );
$oembed = _wp_oembed_get_object();
return $oembed->get_html( $url, $args );
}
/**
* Adds a URL format and oEmbed provider URL pair.
*
* @since 2.9.0
*
* @see WP_oEmbed
*
* @param string $format The format of URL that this provider can handle. You can use asterisks
* as wildcards.
* @param string $provider The URL to the oEmbed provider.
* @param boolean $regex Optional. Whether the `$format` parameter is in a RegEx format. Default false.
*/
function wp_oembed_add_provider( $format, $provider, $regex = false ) {
require_once( ABSPATH . WPINC . '/class-oembed.php' );
if ( did_action( 'plugins_loaded' ) ) {
$oembed = _wp_oembed_get_object();
$oembed->providers[$format] = array( $provider, $regex );
} else {
WP_oEmbed::_add_provider_early( $format, $provider, $regex );
}
}
/**
* Removes an oEmbed provider.
*
* @since 3.5.0
*
* @see WP_oEmbed
*
* @param string $format The URL format for the oEmbed provider to remove.
* @return bool Was the provider removed successfully?
*/
function wp_oembed_remove_provider( $format ) {
require_once( ABSPATH . WPINC . '/class-oembed.php' );
if ( did_action( 'plugins_loaded' ) ) {
$oembed = _wp_oembed_get_object();
if ( isset( $oembed->providers[ $format ] ) ) {
unset( $oembed->providers[ $format ] );
return true;
}
} else {
WP_oEmbed::_remove_provider_early( $format );
}
return false;
}
/**
* Determines if default embed handlers should be loaded.
*
* Checks to make sure that the embeds library hasn't already been loaded. If
* it hasn't, then it will load the embeds library.
*
* @since 2.9.0
*
* @see wp_embed_register_handler()
*/
function wp_maybe_load_embeds() {
/**
* Filter whether to load the default embed handlers.
*
* Returning a falsey value will prevent loading the default embed handlers.
*
* @since 2.9.0
*
* @param bool $maybe_load_embeds Whether to load the embeds library. Default true.
*/
if ( ! apply_filters( 'load_default_embeds', true ) ) {
return;
}
wp_embed_register_handler( 'youtube_embed_url', '#https?://(www.)?youtube\.com/(?:v|embed)/([^/]+)#i', 'wp_embed_handler_youtube' );
wp_embed_register_handler( 'googlevideo', '#http://video\.google\.([A-Za-z.]{2,5})/videoplay\?docid=([\d-]+)(.*?)#i', 'wp_embed_handler_googlevideo' );
/**
* Filter the audio embed handler callback.
*
* @since 3.6.0
*
* @param callable $handler Audio embed handler callback function.
*/
wp_embed_register_handler( 'audio', '#^https?://.+?\.(' . join( '|', wp_get_audio_extensions() ) . ')$#i', apply_filters( 'wp_audio_embed_handler', 'wp_embed_handler_audio' ), 9999 );
/**
* Filter the video embed handler callback.
*
* @since 3.6.0
*
* @param callable $handler Video embed handler callback function.
*/
wp_embed_register_handler( 'video', '#^https?://.+?\.(' . join( '|', wp_get_video_extensions() ) . ')$#i', apply_filters( 'wp_video_embed_handler', 'wp_embed_handler_video' ), 9999 );
}
/**
* The Google Video embed handler callback.
*
* Google Video does not support oEmbed.
*
* @see WP_Embed::register_handler()
* @see WP_Embed::shortcode()
*
* @param array $matches The RegEx matches from the provided regex when calling wp_embed_register_handler().
* @param array $attr Embed attributes.
* @param string $url The original URL that was matched by the regex.
* @param array $rawattr The original unmodified attributes.
* @return string The embed HTML.
*/
function wp_embed_handler_googlevideo( $matches, $attr, $url, $rawattr ) {
// If the user supplied a fixed width AND height, use it
if ( !empty($rawattr['width']) && !empty($rawattr['height']) ) {
$width = (int) $rawattr['width'];
$height = (int) $rawattr['height'];
} else {
list( $width, $height ) = wp_expand_dimensions( 425, 344, $attr['width'], $attr['height'] );
}
/**
* Filter the Google Video embed output.
*
* @since 2.9.0
*
* @param string $html Google Video HTML embed markup.
* @param array $matches The RegEx matches from the provided regex.
* @param array $attr An array of embed attributes.
* @param string $url The original URL that was matched by the regex.
* @param array $rawattr The original unmodified attributes.
*/
return apply_filters( 'embed_googlevideo', '<embed type="application/x-shockwave-flash" src="http://video.google.com/googleplayer.swf?docid=' . esc_attr($matches[2]) . '&amp;hl=en&amp;fs=true" style="width:' . esc_attr($width) . 'px;height:' . esc_attr($height) . 'px" allowFullScreen="true" allowScriptAccess="always" />', $matches, $attr, $url, $rawattr );
}
/**
* YouTube iframe embed handler callback.
*
* Catches YouTube iframe embed URLs that are not parsable by oEmbed but can be translated into a URL that is.
*
* @since 4.0.0
*
* @global WP_Embed $wp_embed
*
* @param array $matches The RegEx matches from the provided regex when calling
* wp_embed_register_handler().
* @param array $attr Embed attributes.
* @param string $url The original URL that was matched by the regex.
* @param array $rawattr The original unmodified attributes.
* @return string The embed HTML.
*/
function wp_embed_handler_youtube( $matches, $attr, $url, $rawattr ) {
global $wp_embed;
$embed = $wp_embed->autoembed( "https://youtube.com/watch?v={$matches[2]}" );
/**
* Filter the YoutTube embed output.
*
* @since 4.0.0
*
* @see wp_embed_handler_youtube()
*
* @param string $embed YouTube embed output.
* @param array $attr An array of embed attributes.
* @param string $url The original URL that was matched by the regex.
* @param array $rawattr The original unmodified attributes.
*/
return apply_filters( 'wp_embed_handler_youtube', $embed, $attr, $url, $rawattr );
}
/**
* Audio embed handler callback.
*
* @since 3.6.0
*
* @param array $matches The RegEx matches from the provided regex when calling wp_embed_register_handler().
* @param array $attr Embed attributes.
* @param string $url The original URL that was matched by the regex.
* @param array $rawattr The original unmodified attributes.
* @return string The embed HTML.
*/
function wp_embed_handler_audio( $matches, $attr, $url, $rawattr ) {
$audio = sprintf( '[audio src="%s" /]', esc_url( $url ) );
/**
* Filter the audio embed output.
*
* @since 3.6.0
*
* @param string $audio Audio embed output.
* @param array $attr An array of embed attributes.
* @param string $url The original URL that was matched by the regex.
* @param array $rawattr The original unmodified attributes.
*/
return apply_filters( 'wp_embed_handler_audio', $audio, $attr, $url, $rawattr );
}
/**
* Video embed handler callback.
*
* @since 3.6.0
*
* @param array $matches The RegEx matches from the provided regex when calling wp_embed_register_handler().
* @param array $attr Embed attributes.
* @param string $url The original URL that was matched by the regex.
* @param array $rawattr The original unmodified attributes.
* @return string The embed HTML.
*/
function wp_embed_handler_video( $matches, $attr, $url, $rawattr ) {
$dimensions = '';
if ( ! empty( $rawattr['width'] ) && ! empty( $rawattr['height'] ) ) {
$dimensions .= sprintf( 'width="%d" ', (int) $rawattr['width'] );
$dimensions .= sprintf( 'height="%d" ', (int) $rawattr['height'] );
}
$video = sprintf( '[video %s src="%s" /]', $dimensions, esc_url( $url ) );
/**
* Filter the video embed output.
*
* @since 3.6.0
*
* @param string $video Video embed output.
* @param array $attr An array of embed attributes.
* @param string $url The original URL that was matched by the regex.
* @param array $rawattr The original unmodified attributes.
*/
return apply_filters( 'wp_embed_handler_video', $video, $attr, $url, $rawattr );
}