<?php

/**
 * Project Honey Pot Interface
 *
 * PHP version 5.3+
 *
 * Licensed under The MIT License.
 * Redistribution of these files must retain the above copyright notice.
 *
 * @author    Josh Sherman <josh@gravityblvd.com>
 * @copyright Copyright 2012-2014, Josh Sherman
 * @license   http://www.opensource.org/licenses/mit-license.html
 * @link      https://github.com/joshtronic/php-projecthoneypot
 * @link      http://www.projecthoneypot.org/httpbl_configure.php
 */

namespace joshtronic;

class ProjectHoneyPot
{
	/**
	 * API Key
	 *
	 * @access private
	 * @var    string
	 */
	private $api_key = '';

	/**
	 * Constructor
	 *
	 * Adds the specified API key to the object.
	 *
	 * @access public
	 * @param  string $api_key PHP API Key (12 characters)
	 */
	public function __construct($api_key)
	{
		if (preg_match('/^[a-z]{12}$/', $api_key))
		{
			$this->api_key = $api_key;
		}
		else
		{
			throw new Exception('You must specify a valid API key.');
		}
	}

	/**
	 * Query
	 *
	 * Performs a DNS lookup to obtain information about the IP address.
	 *
	 * @access public
	 * @param  string $ip_address IPv4 address to check
	 * @return array results from query
	 */
	public function query($ip_address)
	{
		// Validates the IP format
		if (filter_var($ip_address, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4 | FILTER_FLAG_NO_PRIV_RANGE))
		{
			// Flips the script, err, IP address
			$octets = explode('.', $ip_address);
			krsort($octets);
			$reversed_ip = implode('.', $octets);

			// Performs the query
			$results = dns_get_record($this->api_key . '.' . $reversed_ip . '.dnsbl.httpbl.org', DNS_A);

			// Processes the results
			if (isset($results[0]['ip']))
			{
				$results = explode('.', $results[0]['ip']);

				if ($results[0] == 127)
				{
					$results = array(
						'last_activity' => $results[1],
						'threat_score'  => $results[2],
						'categories'    => $results[3],
					);

					// Creates an array of categories
					switch ($results['categories'])
					{
						case 0:
							$categories = array('Search Engine');
							break;

						case 1:
							$categories = array('Suspicious');
							break;

						case 2:
							$categories = array('Harvester');
							break;

						case 3:
							$categories = array('Suspicious', 'Harvester');
							break;

						case 4:
							$categories = array('Comment Spammer');
							break;

						case 5:
							$categories = array('Suspicious', 'Comment Spammer');
							break;

						case 6:
							$categories = array('Harvester', 'Comment Spammer');
							break;

						case 7:
							$categories = array('Suspicious', 'Harvester', 'Comment Spammer');
							break;

						default:
							$categories = array('Reserved for Future Use');
							break;
					}
					
					$results['categories'] = $categories;

					return $results;
				}
			}
			else
			{
				return false;
			}
		}

		return array('error' => 'Invalid IP address.');
	}
}

?>