晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //proc/thread-self/root/home/akaindir/public_html/crm/modules/Vtiger/helpers/ShortURL.php
<?php
/*+***********************************************************************************
 * The contents of this file are subject to the vtiger CRM Public License Version 1.0
 * ("License"); You may not use this file except in compliance with the License
 * The Original Code is:  vtiger CRM Open Source
 * The Initial Developer of the Original Code is vtiger.
 * Portions created by vtiger are Copyright (C) vtiger.
 * All Rights Reserved.
 *************************************************************************************/

/**
 * Helper methods to work with ShortURLs
 */
class Vtiger_ShortURL_Helper {
	
	/*
	 * @param options array(
	 * 'handler_path'     => 'path/to/TrackerClass.php',
	 * 'handler_class'    => 'TrackerClass',
	 * 'handler_function' => 'trackingFunction',
	 * 'handler_data'     => array(
	 *			'key1' => 'value1',
	 *			'key2' => 'value2'
	 *		)
	 *	));
	 */
	static function generateURL(array $options) {
		global $site_URL;
		if (!isset($options['onetime'])) $options['onetime'] = 0;
		$uid = self::generate($options);
		return "$site_URL/shorturl.php?id=" . $uid;
	}
	
	static function generate(array $options) {
		$db = PearDatabase::getInstance();
		
		// TODO Review the random unique ID generation
		$uid = uniqid("", true);
		
		$handlerPath = $options['handler_path'];
		$handlerClass= $options['handler_class'];
		$handlerFn   = $options['handler_function'];
		$handlerData = $options['handler_data'];
		
		if (empty($handlerPath) || empty($handlerClass) || empty($handlerFn)) {
			throw new Exception("Invalid options for generate");
		}
		
		$sql = "INSERT INTO vtiger_shorturls(uid, handler_path, handler_class, handler_function, handler_data, onetime) VALUES (?,?,?,?,?,?)";
		$params = array($uid, $handlerPath, $handlerClass, $handlerFn, json_encode($handlerData), $options['onetime']);
		
		$db->pquery($sql, $params);
		return $uid;
	}
	
	static function handle($uid) {
		$db = PearDatabase::getInstance();
		
		$rs = $db->pquery('SELECT * FROM vtiger_shorturls WHERE uid=?', array($uid));
		if ($rs && $db->num_rows($rs)) {
			$record = $db->fetch_array($rs);
			$handlerPath = decode_html($record['handler_path']);
			$handlerClass= decode_html($record['handler_class']);
			$handlerFn   = decode_html($record['handler_function']);
			$handlerData = json_decode(decode_html($record['handler_data']), true);
			
			checkFileAccessForInclusion($handlerPath);
			require_once $handlerPath;
			
			$handler = new $handlerClass();
			
			// Delete onetime URL
			if ($record['onetime']) $db->pquery('DELETE FROM vtiger_shorturls WHERE id=?', array($record['id']));
			call_user_func(array($handler, $handlerFn), $handlerData);
		} else {
			echo '<h3>Link you have used is invalid or has expired. .</h3>';
		}
	}
	
	/**
	 * Function will send tracker image of 1X1 pixel transparent Image 
	 */
	static function sendTrackerImage() {
		header('Content-Type: image/png');
		echo base64_decode('iVBORw0KGgoAAAANSUhEUgAAAAEAAAABAQMAAAAl21bKAAAAA1BMVEUAAACnej3aAAAAAXRSTlMAQObYZgAAAApJREFUCNdjYAAAAAIAAeIhvDMAAAAASUVORK5CYII=');
	}

	function getInstance($id) {
		$db = PearDatabase::getInstance();
		$self = new self();
		$rs = $db->pquery('SELECT * FROM vtiger_shorturls WHERE uid=?', array($id));
		if ($rs && $db->num_rows($rs)) {
			$row = $db->fetch_array($rs);
			$self->id = $row['id'];
			$self->uid = $row['uid'];
			$self->handler_path = $row['handler_path'];
			$self->handler_class= $row['handler_class'];
			$self->handler_function = $row['handler_function'];
			$self->handler_data = json_decode(decode_html($row['handler_data']), true);
		}
		return $self;
	}

	function compareEquals($data) {
		$valid = true;
		if($this->handler_data) {
			foreach($this->handler_data as $key => $value) {
				if($data[$key] != $value) {
					$valid = false;
					break;
				}
			}
		} else {
			$valid = false;
		}
		return $valid;
	}

	function delete() {
		$db = PearDatabase::getInstance();
		$db->pquery('DELETE FROM vtiger_shorturls WHERE id=?', array($this->id));
	}
}

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