<?php



/**

* Required for class.media-extractor.php to match expected function naming convention.

*

* @param $url Can be just the $url or the whole $atts array

* @return bool|mixed The Youtube video ID via jetpack_get_youtube_id

*/



function jetpack_shortcode_get_youtube_id( $url ) {

	return jetpack_get_youtube_id( $url );

}



/**

* @param $url Can be just the $url or the whole $atts array

* @return bool|mixed The Youtube video ID

*/

function jetpack_get_youtube_id( $url ) {

	// Do we have an $atts array?  Get first att

	if ( is_array( $url ) ) {

		$url = reset( $url );

	}



	$url = youtube_sanitize_url( $url );

	$url = parse_url( $url );

	$id  = false;



	if ( ! isset( $url['query'] ) )

		return false;



	parse_str( $url['query'], $qargs );



	if ( ! isset( $qargs['v'] ) && ! isset( $qargs['list'] ) )

		return false;



	if ( isset( $qargs['list'] ) )

		$id = preg_replace( '|[^_a-z0-9-]|i', '', $qargs['list'] );



	if ( empty( $id ) )

		$id = preg_replace( '|[^_a-z0-9-]|i', '', $qargs['v'] );



	return $id;

}



if ( !function_exists( 'youtube_sanitize_url' ) ) :

/**

* Normalizes a YouTube URL to include a v= parameter and a query string free of encoded ampersands.

*

* @param string $url

* @return string The normalized URL

*/

function youtube_sanitize_url( $url ) {

	$url = trim( $url, ' "' );

	$url = trim( $url );

	$url = str_replace( array( 'youtu.be/', '/v/', '#!v=', '&amp;', '&#038;', 'playlist' ), array( 'youtu.be/?v=', '/?v=', '?v=', '&', '&', 'videoseries' ), $url );



	// Replace any extra question marks with ampersands - the result of a URL like "http://www.youtube.com/v/9FhMMmqzbD8?fs=1&hl=en_US" being passed in.

	$query_string_start = strpos( $url, "?" );



	if ( false !== $query_string_start ) {

		$url = substr( $url, 0, $query_string_start + 1 ) . str_replace( "?", "&", substr( $url, $query_string_start + 1 ) );

	}



	return $url;

}

endif;



/**

 * Merge in three string helper functions from WPCOM.

 *

 * @see WPCOM/wp-content/mu-plugins/string-helpers.php

 */

if ( ! function_exists( 'wp_startswith' ) ) :

	function wp_startswith( $haystack, $needle ) {

		return 0 === strpos( $haystack, $needle );

	}

endif;





if ( ! function_exists( 'wp_endswith' ) ) :

	function wp_endswith( $haystack, $needle ) {

		return $needle === substr( $haystack, -strlen( $needle ));

	}

endif;



if ( ! function_exists( 'wp_in' ) ) :

	function wp_in( $needle, $haystack ) {

		return false !== strpos( $haystack, $needle );

	}

endif;

