WordPress embed handler for shows from cbs.com

gistfile1.php

<?php


function cbscom_embed_register_handler() {
  wp_embed_register_handler( 'cbscom', '|https?://www.cbs.com/shows/.*|i', 'cbscom_embed_handler' );
}
add_action( 'init', 'cbscom_embed_register_handler' );

function cbscom_embed_handler( $matches, $attr, $url, $rawattr ) {
	global $post, $wp_embed;
	
	// no post, no worky
	if ( empty($post) ) {
		return $wp_embed->maybe_make_link( $url );
	}

	// we use this cache key for our metadata because WP itself handles clearing it on post saves as part of oembed
	$cachekey = '_oembed_' . md5( $url . serialize( $attr ) );

	$ret = get_post_meta( $post->ID, $cachekey, true );

	// Failures are cached
	if ( '{{unknown}}' === $ret )
		return $wp_embed->maybe_make_link( $url );
	
	// return early, no need to redo all this work
	if ($ret) {
		return $ret;
	}

	// get the html from cbs.com
	$response = wp_remote_get($url);
	if ( is_wp_error( $response ) || 200 != wp_remote_retrieve_response_code( $response ) ) {
		update_post_meta( $post->ID, $cachekey, '{{unknown}}' );
		return $wp_embed->maybe_make_link( $url );
	}
	$html = wp_remote_retrieve_body($response);

	// find the og:video tag
	preg_match('|<meta.*?og:video.*?>|i',$html, $m);

	// parse it
	if ( !empty($m) ) {
		$meta = $m[0];
		if ( preg_match_all('/<meta(.+?)>/', $meta, $m) ) {
			foreach ($m[1] as $match) {
				foreach ( wp_kses_hair($match, array('http')) as $a)
				    $info[$a['name']] = $a['value'];
			}
		}

		// get the content attribute
		if ( !empty( $info['content'] ) ) {
			$parsed_url = $info['content'];
		}
	}

	// no content, give up
	if ( empty( $parsed_url ) ) {
		update_post_meta( $post->ID, $cachekey, '{{unknown}}' );
		return $wp_embed->maybe_make_link( $url );
	}

	// fix the url to look like their normal embed code
	$parsed_url = remove_query_arg( array('partner','autoPlayVid'), $parsed_url );
	$parsed_url = add_query_arg( array('partner'=>'cbs'), $parsed_url );
	
	// decide on width and height
	if ( !empty($rawattr['width']) && !empty($rawattr['height']) ) {
		$width  = (int) $rawattr['width'];
		$height = (int) $rawattr['height'];
	} else {
		list( $width, $height ) = wp_expand_dimensions( 480, 270, $attr['width'], $attr['height'] );
	}

	// yuck.. but it's their embed code. blame them for it.	
	$ret = "<object width='{$width}' height='{$height}'>
	<param name='movie' value='{$parsed_url}'></param>
	<param name='allowFullScreen' value='true'></param>
	<param name='allowScriptAccess' value='always'></param>
	<embed width='{$width}' height='{$height}' src='{$parsed_url}' allowFullScreen='true' allowScriptAccess='always' type='application/x-shockwave-flash'></embed>
	</object>";

	// cache, and return	
	update_post_meta( $post->ID, $cachekey, $ret );
	return $ret;
}