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<?php
// shortcode handler for [bandcamp], which inserts a bandcamp.com
// music player (iframe, html5)
//
// [bandcamp album=119385304]
// [bandcamp album=3462839126  bgcol=FFFFFF linkcol=4285BB size=venti]
// [bandcamp track=2446959313]
//
function shortcode_handler_bandcamp( $atts ) {
	// there are no default values, but specify here anyway
	// to explicitly list supported atts
	$attributes = shortcode_atts( array(
		'album'       => null,     // integer album id
		'track'       => null,     // integer track id
		'video'       => null,     // integer track id for video player
		'size'        => 'venti',  // one of the supported sizes
		'bgcol'       => 'FFFFFF', // hex, no '#' prefix
		'linkcol'     => null,     // hex, no '#' prefix
		'layout'      => null,     // encoded layout url
		'width'       => null,     // integer with optional "%"
		'height'      => null,     // integer with optional "%"
		'notracklist' => null,     // may be string "true" (defaults false)
		'tracklist'   => null,     // may be string "false" (defaults true)
		'artwork'     => null,     // may be string "false" (alternately: "none") or "small" (default is large)
		'minimal'     => null,     // may be string "true" (defaults false)
		'theme'       => null,     // may be theme identifier string ("light"|"dark" so far)
		'package'     => null,     // integer package id
		't'           => null,     // integer track number
		'tracks'      => null,     // comma separated list of allowed tracks
		'esig'        => null      // hex, no '#' prefix
	), $atts, 'bandcamp' );

	$sizes = array(
		'venti'      => array( 'width' => 400, 'height' => 100 ),
		'grande'     => array( 'width' => 300, 'height' => 100 ),
		'grande2'    => array( 'width' => 300, 'height' => 355 ),
		'grande3'    => array( 'width' => 300, 'height' => 415 ),
		'tall_album' => array( 'width' => 150, 'height' => 295 ),
		'tall_track' => array( 'width' => 150, 'height' => 270 ),
		'tall2'      => array( 'width' => 150, 'height' => 450 ),
		'short'      => array( 'width' => 46, 'height' => 23 ),
		'large'      => array( 'width' => 350, 'height' => 470 ),
		'medium'     => array( 'width' => 450, 'height' => 120 ),
		'small'      => array( 'width' => 350, 'height' => 42 )
	);

	$sizekey = $attributes['size'];
	$height  = null;
	$width   = null;

	$isVideo = false;

	// Build iframe url.  For audio players, args are appended as
	// extra path segments for historical reasons having to
	// do with an IE-only flash bug which required this URL
	// to contain no querystring.  Delay the actual joining
	// of args into a string until after we decide if it's
	// a video player or an audio player
	$argparts = array();

	if ( ! isset( $attributes['album'] ) && ! isset( $attributes['track'] ) && ! isset( $attributes['video'] ) ) {
		return "[bandcamp: shortcode must include 'track', 'album', or 'video' param]";
	}

	if ( isset( $attributes['track'] ) && is_numeric( $attributes['track'] ) ) {
		$track = esc_attr( $attributes['track'] );
		array_push( $argparts, "track={$track}" );
	} elseif ( isset( $attributes['video'] ) && is_numeric( $attributes['video'] ) ) {
		$track = esc_attr( $attributes['video'] ); // videos are referenced by track id
		$urlbase = "//bandcamp.com/EmbeddedPlayer/v=2";
		$isVideo = true;
		array_push( $argparts, "track={$track}" );
	}
	if ( isset( $attributes['album'] ) && is_numeric( $attributes['album'] ) ) {
		$album = esc_attr( $attributes['album'] );
		array_push( $argparts, "album={$album}" );
	}

	if ( $sizekey == 'tall' ) {
		if ( isset( $attributes['album'] ) ) {
			$sizekey .= '_album';
		} else {
			$sizekey .= '_track';
		}
	}

	// if size specified that we don't recognize, fall back on venti
	if ( empty( $sizes[ $sizekey ] ) ) {
		$sizekey            = 'venti';
		$attributes['size'] = 'venti';
	}

	// use strict regex for digits + optional % instead of absint for height/width
	// 'width' and 'height' params in the iframe url get the exact string from the shortcode
	// args, whereas the inline style attribute must have "px" added to it if it has no "%"
	if ( isset( $attributes['width'] ) && preg_match( "|^([0-9]+)(%)?$|", $attributes['width'], $matches ) ) {
		$width = $csswidth = $attributes['width'];
		if ( sizeof( $matches ) < 3 ) {
			$csswidth .= "px";
		}
	}
	if ( isset( $attributes['height'] ) && preg_match( "|^([0-9]+)(%)?$|", $attributes['height'], $matches ) ) {
		$height = $cssheight = $attributes['height'];
		if ( sizeof( $matches ) < 3 ) {
			$cssheight .= "px";
		}
	}

	if ( ! $height ) {
		$height    = $sizes[ $sizekey ]['height'];
		$cssheight = $height . "px";
	}

	if ( ! $width ) {
		$width    = $sizes[ $sizekey ]['width'];
		$csswidth = $width . "px";
	}

	if ( isset( $attributes['layout'] ) ) {
		array_push( $argparts, "layout={$attributes['layout']}" );
	} elseif ( isset( $attributes['size'] ) && preg_match( "|^[a-zA-Z0-9]+$|", $attributes['size'] ) ) {
		array_push( $argparts, "size={$attributes['size']}" );
	}

	if ( isset( $attributes['bgcol'] ) && preg_match( "|^[0-9A-Fa-f]+$|", $attributes['bgcol'] ) ) {
		array_push( $argparts, "bgcol={$attributes['bgcol']}" );
	}

	if ( isset( $attributes['linkcol'] ) && preg_match( "|^[0-9A-Fa-f]+$|", $attributes['linkcol'] ) ) {
		array_push( $argparts, "linkcol={$attributes['linkcol']}" );
	}

	if ( isset( $attributes['package'] ) && preg_match( "|^[0-9]+$|", $attributes['package'] ) ) {
		array_push( $argparts, "package={$attributes['package']}" );
	}

	if ( isset( $attributes['t'] ) && preg_match( "|^[0-9]+$|", $attributes['t'] ) ) {
		array_push( $argparts, "t={$attributes['t']}" );
	}

	if ( $attributes['notracklist'] == "true" ) {
		array_push( $argparts, "notracklist=true" );
	}

	// 'tracklist' arg deprecates 'notracklist=true' to be less weird.  note, behavior
	// if both are specified is undefined
	switch ( $attributes['tracklist'] ) {
		case "false":
		case "none":
			array_push( $argparts, "tracklist=false" );
			break;
	}

	switch ( $attributes['artwork'] ) {
		case "false":
		case "none":
		case "small":
			array_push( $argparts, "artwork=" . $attributes['artwork'] );
			break;
	}

	if ( $attributes['minimal'] == "true" ) {
		array_push( $argparts, "minimal=true" );
	}

	if ( isset( $attributes['theme'] ) && preg_match( "|^[a-zA-Z_]+$|", $attributes['theme'] ) ) {
		array_push( $argparts, "theme={$attributes['theme']}" );
	}

	// param 'tracks' is signed digest param 'esig'
	if ( isset( $attributes['tracks'] ) && preg_match( "|^[0-9\,]+$|", $attributes['tracks'] ) ) {
		if ( isset( $attributes['esig'] ) && preg_match( "|^[0-9A-Fa-f]+$|", $attributes['esig'] ) ) {
			array_push( $argparts, "tracks={$attributes['tracks']}" );
			array_push( $argparts, "esig={$attributes['esig']}" );
		}
	}

	if ( $isVideo ) {
		$url        = "//bandcamp.com/VideoEmbed?" . join( '&', $argparts );
		$extraAttrs = " mozallowfullscreen='1' webkitallowfullscreen='1' allowfullscreen='1'";
	} else {
		$url        = "//bandcamp.com/EmbeddedPlayer/v=2/" . join( '/', $argparts ) . '/';
		$extraAttrs = '';
	}

	return "<iframe width='" . esc_attr( $width ) . "' height='" . esc_attr( $height ) . "' style='position: relative; display: block; width: " . esc_attr( $csswidth ) . "; height: " . esc_attr( $cssheight ) . ";' src='" . esc_url( $url ) . "' allowtransparency='true' frameborder='0'" . $extraAttrs . "></iframe>";
}

add_shortcode( 'bandcamp', 'shortcode_handler_bandcamp' );