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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* Listens for Instant Payment Notification from PayPal
*
* This script waits for Payment notification from PayPal,
* then double checks that data by sending it back to PayPal.
* If PayPal verifies this then it sets up the enrolment for that
* user.
*
* @package enrol
* @subpackage paypal
* @copyright 2010 Eugene Venter
* @author Eugene Venter - based on code by others
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
require("../../config.php");
require_once("lib.php");
require_once($CFG->libdir.'/eventslib.php');
require_once($CFG->libdir.'/enrollib.php');
require_once($CFG->libdir . '/filelib.php');
/// Keep out casual intruders
if (empty($_POST) or !empty($_GET)) {
print_error("Sorry, you can not use the script that way.");
}
/// Read all the data from PayPal and get it ready for later;
/// we expect only valid UTF-8 encoding, it is the responsibility
/// of user to set it up properly in PayPal business account,
/// it is documented in docs wiki.
$req = 'cmd=_notify-validate';
$data = new stdClass();
foreach ($_POST as $key => $value) {
$req .= "&$key=".urlencode($value);
$data->$key = $value;
}
$custom = explode('-', $data->custom);
$data->userid = (int)$custom[0];
$data->courseid = (int)$custom[1];
$data->instanceid = (int)$custom[2];
$data->payment_gross = $data->mc_gross;
$data->payment_currency = $data->mc_currency;
$data->timeupdated = time();
/// get the user and course records
if (! $user = $DB->get_record("user", array("id"=>$data->userid))) {
message_paypal_error_to_admin("Not a valid user id", $data);
die;
}
if (! $course = $DB->get_record("course", array("id"=>$data->courseid))) {
message_paypal_error_to_admin("Not a valid course id", $data);
die;
}
if (! $context = context_course::instance($course->id, IGNORE_MISSING)) {
message_paypal_error_to_admin("Not a valid context id", $data);
die;
}
if (! $plugin_instance = $DB->get_record("enrol", array("id"=>$data->instanceid, "status"=>0))) {
message_paypal_error_to_admin("Not a valid instance id", $data);
die;
}
$plugin = enrol_get_plugin('paypal');
/// Open a connection back to PayPal to validate the data
$paypaladdr = empty($CFG->usepaypalsandbox) ? 'www.paypal.com' : 'www.sandbox.paypal.com';
$c = new curl();
$options = array(
'returntransfer' => true,
'httpheader' => array('application/x-www-form-urlencoded', "Host: $paypaladdr"),
'timeout' => 30,
'CURLOPT_HTTP_VERSION' => CURL_HTTP_VERSION_1_1,
);
$location = "https://$paypaladdr/cgi-bin/webscr";
$result = $c->post($location, $req, $options);
if (!$result) { /// Could not connect to PayPal - FAIL
echo "<p>Error: could not access paypal.com</p>";
message_paypal_error_to_admin("Could not access paypal.com to verify payment", $data);
die;
}
/// Connection is OK, so now we post the data to validate it
/// Now read the response and check if everything is OK.
if (strlen($result) > 0) {
if (strcmp($result, "VERIFIED") == 0) { // VALID PAYMENT!
// check the payment_status and payment_reason
// If status is not completed or pending then unenrol the student if already enrolled
// and notify admin
if ($data->payment_status != "Completed" and $data->payment_status != "Pending") {
$plugin->unenrol_user($plugin_instance, $data->userid);
message_paypal_error_to_admin("Status not completed or pending. User unenrolled from course", $data);
die;
}
// If currency is incorrectly set then someone maybe trying to cheat the system
if ($data->mc_currency != $plugin_instance->currency) {
message_paypal_error_to_admin("Currency does not match course settings, received: ".$data->mc_currency, $data);
die;
}
// If status is pending and reason is other than echeck then we are on hold until further notice
// Email user to let them know. Email admin.
if ($data->payment_status == "Pending" and $data->pending_reason != "echeck") {
$eventdata = new stdClass();
$eventdata->modulename = 'moodle';
$eventdata->component = 'enrol_paypal';
$eventdata->name = 'paypal_enrolment';
$eventdata->userfrom = get_admin();
$eventdata->userto = $user;
$eventdata->subject = "Moodle: PayPal payment";
$eventdata->fullmessage = "Your PayPal payment is pending.";
$eventdata->fullmessageformat = FORMAT_PLAIN;
$eventdata->fullmessagehtml = '';
$eventdata->smallmessage = '';
message_send($eventdata);
message_paypal_error_to_admin("Payment pending", $data);
die;
}
// If our status is not completed or not pending on an echeck clearance then ignore and die
// This check is redundant at present but may be useful if paypal extend the return codes in the future
if (! ( $data->payment_status == "Completed" or
($data->payment_status == "Pending" and $data->pending_reason == "echeck") ) ) {
die;
}
// At this point we only proceed with a status of completed or pending with a reason of echeck
if ($existing = $DB->get_record("enrol_paypal", array("txn_id"=>$data->txn_id))) { // Make sure this transaction doesn't exist already
message_paypal_error_to_admin("Transaction $data->txn_id is being repeated!", $data);
die;
}
if ($data->business != $plugin->get_config('paypalbusiness')) { // Check that the email is the one we want it to be
message_paypal_error_to_admin("Business email is {$data->business} (not ".
$plugin->get_config('paypalbusiness').")", $data);
die;
}
if (!$user = $DB->get_record('user', array('id'=>$data->userid))) { // Check that user exists
message_paypal_error_to_admin("User $data->userid doesn't exist", $data);
die;
}
if (!$course = $DB->get_record('course', array('id'=>$data->courseid))) { // Check that course exists
message_paypal_error_to_admin("Course $data->courseid doesn't exist", $data);;
die;
}
$coursecontext = context_course::instance($course->id, IGNORE_MISSING);
// Check that amount paid is the correct amount
if ( (float) $plugin_instance->cost <= 0 ) {
$cost = (float) $plugin->get_config('cost');
} else {
$cost = (float) $plugin_instance->cost;
}
if ($data->payment_gross < $cost) {
$cost = format_float($cost, 2);
message_paypal_error_to_admin("Amount paid is not enough ($data->payment_gross < $cost))", $data);
die;
}
// ALL CLEAR !
$DB->insert_record("enrol_paypal", $data);
if ($plugin_instance->enrolperiod) {
$timestart = time();
$timeend = $timestart + $plugin_instance->enrolperiod;
} else {
$timestart = 0;
$timeend = 0;
}
// Enrol user
$plugin->enrol_user($plugin_instance, $user->id, $plugin_instance->roleid, $timestart, $timeend);
// Pass $view=true to filter hidden caps if the user cannot see them
if ($users = get_users_by_capability($context, 'moodle/course:update', 'u.*', 'u.id ASC',
'', '', '', '', false, true)) {
$users = sort_by_roleassignment_authority($users, $context);
$teacher = array_shift($users);
} else {
$teacher = false;
}
$mailstudents = $plugin->get_config('mailstudents');
$mailteachers = $plugin->get_config('mailteachers');
$mailadmins = $plugin->get_config('mailadmins');
$shortname = format_string($course->shortname, true, array('context' => $context));
if (!empty($mailstudents)) {
$a->coursename = format_string($course->fullname, true, array('context' => $coursecontext));
$a->profileurl = "$CFG->wwwroot/user/view.php?id=$user->id";
$eventdata = new stdClass();
$eventdata->modulename = 'moodle';
$eventdata->component = 'enrol_paypal';
$eventdata->name = 'paypal_enrolment';
$eventdata->userfrom = $teacher;
$eventdata->userto = $user;
$eventdata->subject = get_string("enrolmentnew", 'enrol', $shortname);
$eventdata->fullmessage = get_string('welcometocoursetext', '', $a);
$eventdata->fullmessageformat = FORMAT_PLAIN;
$eventdata->fullmessagehtml = '';
$eventdata->smallmessage = '';
message_send($eventdata);
}
if (!empty($mailteachers)) {
$a->course = format_string($course->fullname, true, array('context' => $coursecontext));
$a->user = fullname($user);
$eventdata = new stdClass();
$eventdata->modulename = 'moodle';
$eventdata->component = 'enrol_paypal';
$eventdata->name = 'paypal_enrolment';
$eventdata->userfrom = $user;
$eventdata->userto = $teacher;
$eventdata->subject = get_string("enrolmentnew", 'enrol', $shortname);
$eventdata->fullmessage = get_string('enrolmentnewuser', 'enrol', $a);
$eventdata->fullmessageformat = FORMAT_PLAIN;
$eventdata->fullmessagehtml = '';
$eventdata->smallmessage = '';
message_send($eventdata);
}
if (!empty($mailadmins)) {
$a->course = format_string($course->fullname, true, array('context' => $coursecontext));
$a->user = fullname($user);
$admins = get_admins();
foreach ($admins as $admin) {
$eventdata = new stdClass();
$eventdata->modulename = 'moodle';
$eventdata->component = 'enrol_paypal';
$eventdata->name = 'paypal_enrolment';
$eventdata->userfrom = $user;
$eventdata->userto = $admin;
$eventdata->subject = get_string("enrolmentnew", 'enrol', $shortname);
$eventdata->fullmessage = get_string('enrolmentnewuser', 'enrol', $a);
$eventdata->fullmessageformat = FORMAT_PLAIN;
$eventdata->fullmessagehtml = '';
$eventdata->smallmessage = '';
message_send($eventdata);
}
}
} else if (strcmp ($result, "INVALID") == 0) { // ERROR
$DB->insert_record("enrol_paypal", $data, false);
message_paypal_error_to_admin("Received an invalid payment notification!! (Fake payment?)", $data);
}
}
exit;
//--- HELPER FUNCTIONS --------------------------------------------------------------------------------------
function message_paypal_error_to_admin($subject, $data) {
echo $subject;
$admin = get_admin();
$site = get_site();
$message = "$site->fullname: Transaction failed.\n\n$subject\n\n";
foreach ($data as $key => $value) {
$message .= "$key => $value\n";
}
$eventdata = new stdClass();
$eventdata->modulename = 'moodle';
$eventdata->component = 'enrol_paypal';
$eventdata->name = 'paypal_enrolment';
$eventdata->userfrom = $admin;
$eventdata->userto = $admin;
$eventdata->subject = "PAYPAL ERROR: ".$subject;
$eventdata->fullmessage = $message;
$eventdata->fullmessageformat = FORMAT_PLAIN;
$eventdata->fullmessagehtml = '';
$eventdata->smallmessage = '';
message_send($eventdata);
}
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