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<?php
/*
Plugin Name: SoundCloud Shortcode
Plugin URI: https://wordpress.org/extend/plugins/soundcloud-shortcode/
Description: Converts SoundCloud WordPress shortcodes to a SoundCloud widget. Example: [soundcloud]http://soundcloud.com/forss/flickermood[/soundcloud]
Version: 2.3
Author: SoundCloud Inc., simplified for Jetpack by Automattic, Inc.
Author URI: http://soundcloud.com
License: GPLv2

Original version: Johannes Wagener <johannes@soundcloud.com>
Options support: Tiffany Conroy <tiffany@soundcloud.com>
HTML5 & oEmbed support: Tim Bormans <tim@soundcloud.com>
*/

/*
A8C: Taken from http://plugins.svn.wordpress.org/soundcloud-shortcode/trunk/
at revision 664386.

Commenting out (instead of removing) and replacing code with custom modifs
so it's eqsy to see what differs from the standard DOTORG version.

All custom modifs are annoted with "A8C" keyword in comment.
*/

/**
 * Register oEmbed provider
 */

/* A8C: oEmbed is handled now in core; see wp-includes/class-oembed.php
wp_oembed_add_provider( '#https?://(?:api\.)?soundcloud\.com/.*#i', 'http://soundcloud.com/oembed', true );
*/


/**
 * Register SoundCloud shortcode
 */

add_shortcode( 'soundcloud', 'soundcloud_shortcode' );

/**
 * SoundCloud shortcode handler
 *
 * @param  string|array $atts        The attributes passed to the shortcode like [soundcloud attr1="value" /].
 *                                   Is an empty string when no arguments are given.
 * @param  string       $content     The content between non-self closing [soundcloud]...[/soundcloud] tags.
 *
 * @return string                  Widget embed code HTML
 */
function soundcloud_shortcode( $atts, $content = null ) {

	// Custom shortcode options
	$shortcode_options = array_merge( array( 'url' => trim( $content ) ), is_array( $atts ) ? $atts : array() );

	// Turn shortcode option "param" (param=value&param2=value) into array
	$shortcode_params = array();
	if ( isset( $shortcode_options['params'] ) ) {
		parse_str( html_entity_decode( $shortcode_options['params'] ), $shortcode_params );
	}
	$shortcode_options['params'] = $shortcode_params;

	/* A8C: The original plugin exposes options we don't. SoundCloud omits "visual" shortcode
	        option when false, so if logic here remains, impossible to have non-visual shortcode.
	$player_type = soundcloud_get_option( 'player_type', 'visual' );
	$isIframe    = $player_type !== 'flash';
	$isVisual    = ! $player_type || $player_type === 'visual' || $shortcode_options['visual'];
	*/

	// User preference options
	$plugin_options = array_filter(
		array(
			'iframe' => true, // A8C: See above comment; flash is not a supported option
			'width'  => soundcloud_get_option( 'player_width' ),
			'height' => soundcloud_url_has_tracklist( $shortcode_options['url'] ) ? soundcloud_get_option( 'player_height_multi' ) : soundcloud_get_option( 'player_height' ),
			'params' => array_filter(
				array(
					'auto_play'     => soundcloud_get_option( 'auto_play' ),
					'show_comments' => soundcloud_get_option( 'show_comments' ),
					'color'         => soundcloud_get_option( 'color' ),
					'visual'        => 'false', // A8C: Merged with params below at $options assignment
				)
			),
		)
	);

	// Needs to be an array
	if ( ! isset( $plugin_options['params'] ) ) {
		$plugin_options['params'] = array();
	}

	// plugin options < shortcode options
	$options = array_merge(
		$plugin_options,
		$shortcode_options
	);

	// plugin params < shortcode params
	$options['params'] = array_merge(
		$plugin_options['params'],
		$shortcode_options['params']
	);

	// The "url" option is required
	if ( ! isset( $options['url'] ) ) {
		return '';
	} else {
		$options['url'] = trim( $options['url'] );
	}

	// Both "width" and "height" need to be integers
	if ( isset( $options['width'] ) && ! preg_match( '/^\d+$/', $options['width'] ) ) {
		// set to 0 so oEmbed will use the default 100% and WordPress themes will leave it alone
		$options['width'] = 0;
	}
	if ( isset( $options['height'] ) && ! preg_match( '/^\d+$/', $options['height'] ) ) {
		unset( $options['height'] );
	}

	// The "iframe" option must be true to load the iframe widget
	$iframe = soundcloud_booleanize( $options['iframe'] );

	// Remove visual parameter from Flash widget, when it's false because that's the default, or when displaying the smallest player
	if ( $options['params']['visual'] && ( ! $iframe || ! soundcloud_booleanize( $options['params']['visual'] ) || ( isset( $options['height'] ) && '20' == $options['height'] ) ) ) {
		unset( $options['params']['visual'] );
	}

	// Merge in "url" value
	$options['params'] = array_merge(
		array(
			'url' => $options['url'],
		), $options['params']
	);

	// Return html embed code
	if ( $iframe ) {
		return soundcloud_iframe_widget( $options );
	} else {
		return soundcloud_flash_widget( $options );
	}
}

/**
 * Plugin options getter
 *
 * @param  string|array $option  Option name
 * @param  mixed        $default Default value
 *
 * @return mixed                   Option value
 */
function soundcloud_get_option( $option, $default = false ) {
	$value = get_option( 'soundcloud_' . $option );

	return $value === '' ? $default : $value;
}

/**
 * Booleanize a value
 *
 * @param  boolean|string $value
 *
 * @return boolean
 */
function soundcloud_booleanize( $value ) {
	return is_bool( $value ) ? $value : $value === 'true' ? true : false;
}

/**
 * Decide if a url has a tracklist
 *
 * @param  string $url
 *
 * @return boolean
 */
function soundcloud_url_has_tracklist( $url ) {
	return preg_match( '/^(.+?)\/(sets|groups|playlists)\/(.+?)$/', $url );
}

/**
 * Parameterize url
 *
 * @param  array $match Matched regex
 *
 * @return string          Parameterized url
 */
function soundcloud_oembed_params_callback( $match ) {
	global $soundcloud_oembed_params;

	// Convert URL to array
	$url = parse_url( urldecode( $match[1] ) );
	// Convert URL query to array
	parse_str( $url['query'], $query_array );
	// Build new query string
	$query = http_build_query( array_merge( $query_array, $soundcloud_oembed_params ) );

	return 'src="' . $url['scheme'] . '://' . $url['host'] . $url['path'] . '?' . $query;
}

/**
 * Iframe widget embed code
 *
 * @param  array $options Parameters
 *
 * @return string            Iframe embed code
 */
function soundcloud_iframe_widget( $options ) {

	// Build URL
	$url = set_url_scheme( 'https://w.soundcloud.com/player/?' . http_build_query( $options['params'] ) );
	// Set default width if not defined
	$width = isset( $options['width'] ) && $options['width'] !== 0 ? $options['width'] : '100%';
	// Set default height if not defined
	$height = isset( $options['height'] ) && $options['height'] !== 0
		? $options['height']
		: ( soundcloud_url_has_tracklist( $options['url'] ) || ( isset( $options['params']['visual'] ) && soundcloud_booleanize( $options['params']['visual'] ) ) ? '450' : '166' );

	return sprintf( '<iframe width="%s" height="%s" scrolling="no" frameborder="no" src="%s"></iframe>', $width, $height, $url );
}

/**
 * Legacy Flash widget embed code
 *
 * @param array $options Parameters
 *
 * @return string            Flash embed code
 */
function soundcloud_flash_widget( $options ) {
	// Build URL
	$url = set_url_scheme( 'https://player.soundcloud.com/player.swf?' . http_build_query( $options['params'] ) );
	// Set default width if not defined
	$width = isset( $options['width'] ) && $options['width'] !== 0 ? $options['width'] : '100%';
	// Set default height if not defined
	$height = isset( $options['height'] ) && $options['height'] !== 0 ? $options['height'] : ( soundcloud_url_has_tracklist( $options['url'] ) ? '255' : '81' );

	return preg_replace(
		'/\s\s+/', '', sprintf(
			'<object width="%s" height="%s">
				<param name="movie" value="%s" />
				<param name="allowscriptaccess" value="always" />
				<embed width="%s" height="%s" src="%s" allowscriptaccess="always" type="application/x-shockwave-flash"></embed>
			</object>', $width, $height, $url, $width, $height, $url
		)
	);
}

/**
 * SoundCloud Embed Reversal
 *
 * Converts a generic HTML embed code from SoundClound into a
 * WordPress.com-compatibly shortcode.
 *
 * @param string $content HTML content.
 *
 * @return string Parsed content.
 */
function jetpack_soundcloud_embed_reversal( $content ) {
	if ( ! is_string( $content ) || false === stripos( $content, 'w.soundcloud.com/player' ) ) {
		return $content;
	}

	/* Sample embed code:

		<iframe width="100%" height="450" scrolling="no" frameborder="no" src="https://w.soundcloud.com/player/?url=https%3A//api.soundcloud.com/tracks/150745932&amp;auto_play=false&amp;hide_related=false&amp;show_comments=true&amp;show_user=true&amp;show_reposts=false&amp;visual=true"></iframe>
	*/

	$regexes = array();

	$regexes[] = '#<iframe[^>]+?src="((?:https?:)?//w\.soundcloud\.com/player/[^"\']++)"[^>]*+>\s*?</iframe>#i';
	$regexes[] = '#&lt;iframe(?:[^&]|&(?!gt;))+?src="((?:https?:)?//w\.soundcloud\.com/player/[^"\']++)"(?:[^&]|&(?!gt;))*+&gt;\s*?&lt;/iframe&gt;#i';

	foreach ( $regexes as $regex ) {
		if ( ! preg_match_all( $regex, $content, $matches, PREG_SET_ORDER ) ) {
			continue;
		}

		foreach ( $matches as $match ) {

			// if pasted from the visual editor - prevent double encoding
			$match[1] = str_replace( '&amp;amp;', '&amp;', $match[1] );

			$args = parse_url( html_entity_decode( $match[1] ), PHP_URL_QUERY );
			$args = wp_parse_args( $args );

			if ( ! preg_match( '#^(?:https?:)?//api\.soundcloud\.com/.+$#i', $args['url'], $url_matches ) ) {
				continue;
			}

			if ( ! preg_match( '#height="(\d+)"#i', $match[0], $hmatch ) ) {
				$height = '';
			} else {
				$height = ' height="' . intval( $hmatch[1] ) . '"';
			}

			unset( $args['url'] );
			$params = 'params="';
			if ( count( $args ) > 0 ) {
				foreach ( $args as $key => $value ) {
					$params .= esc_html( $key ) . '=' . esc_html( $value ) . '&amp;';
				}
				$params = substr( $params, 0, -5 );
			}
			$params .= '"';

			$shortcode = '[soundcloud url="' . esc_url( $url_matches[0] ) . '" ' . $params . ' width="100%"' . $height . ' iframe="true" /]';

			$replace_regex = sprintf( '#\s*%s\s*#', preg_quote( $match[0], '#' ) );
			$content       = preg_replace( $replace_regex, sprintf( "\n\n%s\n\n", $shortcode ), $content );
			/** This action is documented in modules/shortcodes/youtube.php */
			do_action( 'jetpack_embed_to_shortcode', 'soundcloud', $url_matches[0] );
		}
	}

	return $content;
}

add_filter( 'pre_kses', 'jetpack_soundcloud_embed_reversal' );