#!/usr/bin/php -q
<?php

#
# Sets the PHONESPAMFILTER dialplan variable based on the callerid. If
# no callerid is presented, or the callerid is blocked, the variable
# is set to 0. If callerid is presented and passes the filter, it is
# set to 1. If it is presented and fails the filter, it is set to 2.
#

# We recommend a score between 15 and 30. 15 provides the strongest
# protection.
$PASS_SCORE = 15;

# MAXTIME holds the timeout in seconds for the web request. Use a short
# timeout to guarantee good performance.
$MAXTIME = 2;


require 'phpagi.php';
$agi = new AGI();


$r = $agi->get_variable("CALLERID(num)");
if ($r["result"] == 0) {	# Some sort of failure.
	$agi->set_variable("PHONESPAMFILTER", "0");
	exit(0);
}

$cidnum = $r["data"];
if ($cidnum < 1000000000)	# No valid callerid.
{
	$agi->set_variable("PHONESPAMFILTER", "0");
	exit(0);
}

# This program assumes curl is installed. wget could also be used.
$score = `curl --silent --max-time $MAXTIME http://www.phonespamfilter.com/check.php?phone=$cidnum`;

# Eliminate any whitespace.
$score = trim($score);

# Log the score in verbose mode.
$agi->verbose("PSF Score: $score");

if ($score == "" || $score == "-1")	# Timeout or other failure.
{
	$agi->set_variable("PHONESPAMFILTER", "0");
}
else if ($score < $PASS_SCORE)	# pass
{
	$agi->set_variable("PHONESPAMFILTER", "1");
}
else				# fail.
{
	$agi->verbose("PSF Score too high. Call blocked.");
	$agi->set_variable("PHONESPAMFILTER", "2");
}

?>