<?php

/* Author: Jasper Goes <jasper@jaspergoes.nl>
 * LocationOf.com
 * March 29th 2011 (Modified June 4th 2017)
 *
 * ====
 * Documentation can be found at http://www.locationof.com/api/
 * ====
 *
 * PHP Dependencies:
 * - cURL ( http://php.net/manual/en/book.curl.php )
 *
 * This file does not need to be modified for usage.
 */

class LocationOf
{
    private $apiKey;
    private $useCache = true;
    private static $cacheFolder = 'LocationOf_cache';

    function __construct($apiKey = 'demo')
    {
        $this->apiKey = $apiKey;
    }

    public function setUseCache($b)
    {
        $this->useCache = is_bool($b) ? $b : true;
    }

    public function get($timestampStart = 0, $timestampEnd = 0)
    {

        if (!$this->useCache || @filemtime(self::getCacheFolderPath() . ($cacheFile = $this->apiKey . '_' . $timestampStart . '_' . $timestampEnd . '.cache')) <= time() - 15) {

            /* Test for cURL extension */
            if (!function_exists('curl_init'))
                self::displayError("Your version of PHP does not have cURL support.\nMake sure to compile and/or enable the PHP cURL Extension.");

            /* Start cURL request */
            $curl = curl_init();

            $data = array(
                'key' => $this->apiKey,
                'start' => $timestampStart,
                'end' => $timestampEnd,
                'av' => 1
            );

            if (isset($_SERVER['REQUEST_URI'])) {
                $data['req'] = 'http' . (isset($_SERVER['HTTPS']) ? 's' : '') . '://' . $_SERVER['HTTP_HOST'] .
                    (isset($_SERVER['SERVER_PORT']) && $_SERVER['SERVER_PORT'] != '80' ? ':' . $_SERVER['SERVER_PORT'] : '') . $_SERVER['REQUEST_URI'];
            }

            if (isset($_SERVER['HTTP_REFERER'])) {
                $data['ref'] = $_SERVER['HTTP_REFERER'];
            }

            foreach (array(
                         CURLOPT_URL => 'http://www.locationof.com/api/dev/pull.php',
                         CURLOPT_RETURNTRANSFER => true,
                         CURLOPT_POST => true,
                         CURLOPT_CONNECTTIMEOUT => 4,
                         CURLOPT_TIMEOUT => 14,
                         CURLOPT_POSTFIELDS => $data
                     ) as $k => $v) curl_setopt($curl, $k, $v);

            $output = curl_exec($curl);

            if ($output === false) {

                if (curl_errno($curl) == 28 && $this->useCache && file_exists(self::getCacheFolderPath() . $cacheFile)) {

                    touch(self::getCacheFolderPath() . $cacheFile);
                    return json_decode(@file_get_contents(self::getCacheFolderPath() . $cacheFile), true);

                }

                self::displayError("cURL Error Code: " . curl_errno($curl) . "\ncURL Error Message: " . curl_error($curl), "cURL Error");

            } else {

                $output = json_decode($output, true);

            }

            curl_close($curl);

            if (isset($output['error']))
                self::displayError("Code: " . $output['error']['code'] . "\nMessage: " . $output['error']['msg']);

            if ($this->useCache && ($h = @fopen(self::getCacheFolderPath() . $cacheFile, 'w'))) {
                fwrite($h, json_encode($output['data']));
                fclose($h);
            }

            return $output['data'];

        }

        return json_decode(@file_get_contents(self::getCacheFolderPath() . $cacheFile), true);

    }

    private static function displayError($error, $errorType = 'Error')
    {

        @ob_end_clean();
        header('Content-Type: text/plain');
        echo '[Location Of API] ' . $errorType . "\n" . $error;
        exit;

    }

    private static function getCacheFolderPath()
    {

        $absoluteCacheFolderPath = substr(__FILE__, 0, strrpos(__FILE__, DIRECTORY_SEPARATOR) + 1) .
            (empty(self::$cacheFolder) ? '' : self::$cacheFolder . (substr(self::$cacheFolder, -strlen(DIRECTORY_SEPARATOR)) != DIRECTORY_SEPARATOR ? DIRECTORY_SEPARATOR : ''));

        if (!is_dir($absoluteCacheFolderPath) && !@mkdir($absoluteCacheFolderPath))
            self::displayError("The cache folder does not exist and could not be created.");

        if (!is_writable($absoluteCacheFolderPath))
            self::displayError("The cache folder is not writable.");

        return $absoluteCacheFolderPath;

    }

}

?>