remote-url-summarizer.php

<?php
/*
Plugin Name: Remote URL Summarizer
Description: Scan remote / external links with a post or comments, and provide a summary of the scanned links during display.
Plugin URI: https://github.com/daggerhart/remote-url-summarizer
Version: 1.2
Author: daggerhart
Author URI: http://www.daggerhart.com
License: GPLv2 Copyright (c) 2015 daggerhart
*/

define( 'RURLS_VERSION', '1.2' );
define( 'RURLS_PLUGIN_DIR', dirname( __FILE__ ) );
define( 'RURLS_SETTINGS_NAME', 'rurls_settings' );
define( 'RURLS_META_KEY_SCANNED', 'rurls_scanned' );
define( 'RURLS_META_KEY_URLS', 'rurls_remote_urls' );
define( 'RURLS_META_KEY_DATA', 'rurls_data' );

class Remote_URL_Summarizer {

	// default plugin settings values
	private $default_settings = array(
		'mime_types' => array(
			'image/jpeg' => 1,
		),
		'post_types' => array(
			'post' => 1
		),
		'image_size' => 'thumbnail',
		'default_stylesheet' => 1,
	);

	// storage for plugin settings
	private $settings = array();

	// singleton instance
	static private $instance = null;

	/**
	 * Access singleton instance
	 *
	 * @return \Remote_URL_Summarizer
	 */
	static public function get_instance(){
		if ( is_null( self::$instance ) ){
			self::$instance = new Remote_URL_Summarizer();
		}

		return self::$instance;
	}

	/**
	 * Hook into WP init
	 */
	private function __construct(){
		add_action( 'init', array( $this, 'init' ) );
	}

	/**
	 * Complete the requirements of this plugin
	 */
	function init(){
		define( 'RURLS_PLUGIN_URL', plugins_url( basename( RURLS_PLUGIN_DIR ) ) );

		// common files
		include_once RURLS_PLUGIN_DIR . '/rurls/helper-functions.php';

		// common classes
		new \Rurls\Common\Fetch( $this->get_settings() );
		new \Rurls\Common\Display( $this->get_settings() );
		new \Rurls\Common\Mimetypes\Images( $this->get_settings() );
		new \Rurls\Common\Mimetypes\Html( $this->get_settings() );

		// admin only
		if ( is_admin() ) {
			new \Rurls\Admin\Settings( $this->get_settings() );
		}
	}

	/**
	 * Get plugin settings
	 *  - settings field logic in admin/settings class
	 *
	 * @return array
	 */
	public function get_settings() {
		if ( ! empty( $this->settings ) ){
			return $this->settings;
		}

		$this->settings = wp_parse_args( get_option( RURLS_SETTINGS_NAME, array() ), $this->default_settings );
		return $this->settings;
	}
}

// autoloader
spl_autoload_register(function ($class) {

	// project-specific namespace prefix
	$prefix = 'Rurls\\';

	// base directory for the namespace prefix
	$base_dir = __DIR__ . '/rurls/';

	// does the class use the namespace prefix?
	$len = strlen($prefix);
	if (strncmp($prefix, $class, $len) !== 0) {
		// no, move to the next registered autoloader
		return;
	}

	// get the relative class name
	$relative_class = substr($class, $len);

	// replace the namespace prefix with the base directory, replace namespace
	// separators with directory separators in the relative class name, append
	// with .php
	$file = strtolower($base_dir . str_replace('\\', '/', $relative_class) . '.php');

	// if the file exists, require it
	if (file_exists($file)) {
		require $file;
	}
});

// What a lovely day!
Remote_URL_Summarizer::get_instance();