class-itunes-link-builder.php

<?php
define( 'ITUNES_AFFILIATE_TAG', '' );

new Itunes_Link_Builder();

/**
 * Class Name: iTunes Link Builder
 * @author @ottanxyz
 */
class iTunes_Link_Builder {

	function __construct()	{
		wp_embed_register_handler(
			'itunes_link_builder',
			'/https:\\/\\/itunes\\.apple\\.com\\/jp\\/(.*)$/i',
			array( &$this, 'handler' )
		);
		add_shortcode( 'itunes', array( &$this, 'display' ) );
	}

	public function handler( $matches, $attr, $url, $rawattr ) {
		preg_match( "/id(\d+)/", $matches[1], $id );
		return "[itunes id=\"{$id[1]}\"]";
	}

	public function display( $p ) {
		if ( !isset( $p['id'] ) ) {
			return;
		}

		if ( false === ( $results = get_transient( 'itunes-' . $p['id'] ) ) ) {
			$url = sprintf( "https://itunes.apple.com/lookup?id=%s&country=JP", $p['id'] );
			$ch = curl_init();
			curl_setopt( $ch, CURLOPT_URL, $url );
			curl_setopt( $ch, CURLOPT_RETURNTRANSFER, true );
			curl_setopt( $ch, CURLOPT_FRESH_CONNECT, true );
			$json = json_decode( curl_exec( $ch ) );
			curl_close( $ch );

			if ( isset( $json->error ) && $json->error ) {
				return;
			}

			$results = $json->results[0];

			set_transient( 'itunes-' . $p['id'], $results, DAY_IN_SECONDS  );
		}

		if ( !isset( $results->kind ) || ( 'software' !== $results->kind && 'mac-software' !== $results->kind ) ) {
			return;
		}

		$artistName = $results->artistName;
		$artworkUrl60 = $results->artworkUrl60;
		$trackName = $results->trackName;
		$trackViewUrl = $results->trackViewUrl . "&at=". ITUNES_AFFILIATE_TAG;
		$genres = implode( ', ', $results->genres );
		$formattedPrice = $results->formattedPrice;
		$storeName = ( $results->kind === 'software' ) ? 'App Store' : 'Mac App Store';

		return <<< EOM
<div class="wpappbox">
<div class="appicon">
<a target="_blank" rel="nofollow" href="${trackViewUrl}" title="${trackName}" sl-processed="1"><img src="${artworkUrl60}" scale="0"></a>
</div>
<div class="applinks">
</div>
<div class="appdetails">
<div class="apptitle">
<a target="_blank" rel="nofollow" href="${trackViewUrl}" title="${trackName}" class="apptitle" sl-processed="1">${trackName}</a></div>
<div class="developer">Developer: ${artistName}</div>
<div class="price">Price: ${formattedPrice}</div>
</div>
</div>
EOM;
	}

}
?>