<?php

/*
Copyright (c) 2007, Till Brehm, projektfarm Gmbh
All rights reserved.

Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:

    * Redistributions of source code must retain the above copyright notice,
      this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright notice,
      this list of conditions and the following disclaimer in the documentation
      and/or other materials provided with the distribution.
    * Neither the name of ISPConfig nor the names of its contributors
      may be used to endorse or promote products derived from this software without
      specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

class squid_plugin {

	var $plugin_name = 'squid_plugin';
	var $class_name = 'squid_plugin';

	// private variables
	var $action = '';

	//* This function is called during ispconfig installation to determine
	//  if a symlink shall be created for this plugin.
	function onInstall() {
		global $conf;

		if(isset($conf['services']['proxy']) &&$conf['services']['proxy'] == true && isset($conf['squid']['installed']) && $conf['squid']['installed'] == true) {
			return true;
		} else {
			return false;
		}

	}


	/*
	 	This function is called when the plugin is loaded
	*/

	function onLoad() {
		global $app;

		/*
		Register for the events
		*/


		$app->plugins->registerEvent('proxy_reverse_insert', $this->plugin_name, 'insert');
		$app->plugins->registerEvent('proxy_reverse_update', $this->plugin_name, 'update');
		$app->plugins->registerEvent('proxy_reverse_delete', $this->plugin_name, 'delete');

		$app->plugins->registerEvent('web_domain_insert', $this->plugin_name, 'insert');
		$app->plugins->registerEvent('web_domain_update', $this->plugin_name, 'update');
		$app->plugins->registerEvent('web_domain_delete', $this->plugin_name, 'delete');


	}


	function insert($event_name, $data) {
		global $app, $conf;


		// just run the update function
		$this->update($event_name, $data);


	}


	function update($event_name, $data) {
		global $app, $conf;

		$domains = $this->_getSquidDomains($app);
		$rules = $this->_getSquidRewriteRules($app);

		$app->load('tpl');
		$tpl = new tpl();
		$tpl->newTemplate("squidRewriteRules.py.master");
		if (!empty($rules))$tpl->setLoop('squid_rewrite_rules', $rules);
		file_put_contents('/etc/squid/squidRewriteRules.py', $tpl->grab());
		unset($tpl);
		$app->log('Writing squid rewrite configuration to /etc/squid/squidRewriteRules.py', LOGLEVEL_DEBUG);


		$tpl = new tpl();
		$tpl->newTemplate("domains.txt.master");
		$tpl->setLoop('squid_domains', $domains);
		file_put_contents('/etc/squid/domains.txt', $tpl->grab());
		unset($tpl);
		$app->log('Writing squid domains configuration to /etc/squid/domains.txt', LOGLEVEL_DEBUG);


		// request a httpd reload when all records have been processed
		$app->services->restartServiceDelayed('squid', 'restart');

	}

	function delete($event_name, $data) {
		global $app, $conf;

		// load the server configuration options

		// just run the update function
		$this->update($event_name, $data);

	}

	function _getSquidDomains($app)
	{
		$records = $app->dbmaster->queryAllRecords("SELECT ds.origin, dr.name, IF(origin=name,true,false) AS isRoot FROM dns_soa ds inner join dns_rr dr ON ds.id=dr.zone WHERE ds.active='Y' AND dr.type IN ('A','CNAME') AND dr.name NOT IN ('mail','ns1')");
		$domains = array();
		foreach ($records as $record) {

			$origin = substr($record["origin"], 0, -1);
			if ($record["isRoot"])
			{
				array_push($domains, array("domain" => $origin));
			} else {
				array_push($domains, array("domain" => $record["name"].".".$origin));
			}

		}

		return $domains;

	}

	function _getSquidRewriteRules($app)
	{
		$rules = array();

		$rules = $app->db->queryAllRecords("SELECT rewrite_url_src, rewrite_url_dest FROM squid_reverse ORDER BY rewrite_id ASC");
		$web_domains = $app->db->queryAllRecords("SELECT wd.subdomain, wd.domain, si.ip_address  FROM web_domain wd INNER JOIN server s USING(server_id) INNER JOIN server_ip si USING(server_id)");

		foreach ($web_domains as $domain) {
			if ($domain["subdomain"] == "www") {
				array_push($rules, array("rewrite_url_src"=>"^http://www.".$domain["domain"]."/(.*)", "rewrite_url_dest"=>"http://".$domain["ip_address"].":80/"));
				array_push($rules, array("rewrite_url_src"=>"^http://".$domain["domain"]."/(.*)", "rewrite_url_dest"=>"http://".$domain["ip_address"].":80/"));
			}  else {
				array_push($rules, array("rewrite_url_src"=>"^http://www.".$domain["domain"]."/(.*)", "rewrite_url_dest"=>"http://".$domain["ip_address"].":80/"));
			}
		}
		return $rules;
	}


} // end class

?>