<?php
/*
	inc_phone_home.php

	This class provides functions for reading stats from the system and submitting
	then back to Amberdms in a "phone-home" feature.

	Typicially this class is called at login but only actually executes once a day.

	No private data is submitted, only info such as customer ID & plan (if any) as
	well as
*/


class phone_home
{
	var $url	= "https://www.amberdms.com/api/opensource/amberdms_phone_home.php";
	var $url_ssl	= "true";	// set to true to enforce validation of SSL certificate

	var $stats;	// used to hold stats about the system for submission upstream


	/*
		check_enabled

		Check that phone home is enabled.

		Returns
		0	Disabled
		1	Enabled
	*/
	function check_enabled()
	{
		if (sql_get_singlevalue("SELECT value FROM config WHERE name='PHONE_HOME' LIMIT 1") == "enabled")
		{
			// enabled
			return 1;
		}

		return 0;

	} // end of check_enabled


	/*
		check_phone_home_timer

		Check if it's time to phone home, we only want to do this once every 12 hours at the most, otherwise
		it's just adding unnessary load and delays on the application if we check too often.

		Returns
		0	No need to run phone home functions
		1	Time to call in
	*/
	function check_phone_home_timer()
	{
		$time_update		= sql_get_singlevalue("SELECT value FROM config WHERE name='PHONE_HOME_TIMER' LIMIT 1");
		$time_current		= mktime();

		if (($time_update + 43200) < $time_current)
		{
			// time to phone home (been more than 12 hours since last attempt)
			return 1;
		}

		return 0;

	} // end of check_phone_home_timer


	/*
		stats_generate

		Generates a list of different stats and stores in $this->stats;
	*/
	function stats_generate()
	{
		log_write("debug", "phone_home", "Executing stats_generate()");

		/*
			Application Details
		*/

		$this->stats["app_name"] 	= $GLOBALS["config"]["app_name"];
		$this->stats["app_version"]	= $GLOBALS["config"]["app_version"];

		/*
			Server Details
		*/

		$this->stats["server_app"]	= $_SERVER["SERVER_SOFTWARE"];
		$this->stats["server_php"]	= phpversion();


		/*
			Configuration Information
		*/

		// account information
		$this->stats["subscription_support"]	= sql_get_singlevalue("SELECT value FROM config WHERE name='SUBSCRIPTION_SUPPORT' LIMIT 1");
		$this->stats["subscription_id"]		= sql_get_singlevalue("SELECT value FROM config WHERE name='SUBSCRIPTION_ID' LIMIT 1");

		// check account ID
		if (!$this->stats["subscription_id"])
		{
			// if no subscription id exists, then this must be running the open source version
			// we should create an ID so we can track requests from this server, we do this by
			// aggregating the server name and the instance name (if any) however we then hash
			// for privacy reasons.

			$this->stats["subscription_id"] = md5($_SERVER["SERVER_NAME"] . $_SESSION["user"]["instance"]["id"]);

			$sql_obj		= New sql_query;
			$sql_obj->string	= "UPDATE config SET value='". $this->stats["subscription_id"] ."' WHERE name='SUBSCRIPTION_ID' LIMIT 1";
			$sql_obj->execute();

			log_write("debug", "phone_home", "Generated new subscription ID of ". $this->stats["subscription_id"] ."");
		}


		return 1;
		
	} // end of stats_generate


	/*
		stats_submit()

		Upload the stats to the Amberdms servers for user base size & tracking purposes.

		Returns
		0	Failure - possible HTTP/S transport issue such as firewalled DMZ server?
		1	Success
	*/
	function stats_submit()
	{
		log_write("debug", "phone_home", "Executing stats_submit()");


		/*
			Update Timer
		*/

		$sql_obj		= New sql_query;
		$sql_obj->string	= "UPDATE config SET value='". mktime() ."' WHERE name='PHONE_HOME_TIMER' LIMIT 1";
		$sql_obj->execute();


		/*
			Submit Data
		*/

		foreach($this->stats as $key=>$value)
		{
			$fields_string .= $key.'='.urlencode($value).'&';
		}

		rtrim($fields_string,'&');

		// open connection
		$ch = curl_init();

		//set the url, number of POST vars, POST data
		curl_setopt($ch,CURLOPT_URL,$this->url);
		curl_setopt($ch,CURLOPT_POST,count($this->stats));
		curl_setopt($ch,CURLOPT_POSTFIELDS,$fields_string);
		curl_setopt($ch,CURLOPT_TIMEOUT,2);				// wait a max of 2 seconds
		curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, $this->url_ssl); 	// ssl validation options

		// execute post
		if (!curl_exec($ch))
		{	
			log_write("debug", "process", "Unable to phone home to Amberdms servers, Curl error whilst POSTing data: ". curl_error($ch));
			
			curl_close($ch);
			return 0;
		}

		// check HTTP return code
		switch ($http_return_code = curl_getinfo($ch, CURLINFO_HTTP_CODE))
		{
			case "400":
				log_write("debug", "process", "Invalid data provided to phone home interface, information refused.");
			break;

			case "200":
				log_write("debug", "process", "Server stats successfully returned to Amberdms. Thank you for submitting.");
			break;

			default:
				log_write("debug", "process", "Unexpected error, HTTP code $http_return_code returned!");
			break;
		}
		
		curl_close($ch);
		return 1;

	} // end of stats_submit


} // end of phone_home class

?>