mirrored from git://git.moodle.org/moodle.git
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ipn.php
219 lines (159 loc) · 7.85 KB
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ipn.php
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<?php // $Id$
/**
* 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
*
* Set the $user->timeaccess course array
*
* @param user referenced object, must contain $user->id already set
*/
require("../../config.php");
require("enrol.php");
/// Keep out casual intruders
if (empty($_POST) or !empty($_GET)) {
error("Sorry, you can not use the script that way.");
}
/// Read all the data from Paypal and get it ready for later
$req = 'cmd=_notify-validate';
foreach ($_POST as $key => $value) {
$value = urlencode(stripslashes($value));
$req .= "&$key=$value";
$data->$key = urldecode($value);
}
$custom = explode('-', $data->custom);
$data->userid = (int)$custom[0];
$data->courseid = (int)$custom[1];
$data->payment_gross = $data->mc_gross;
$data->payment_currency = $data->mc_currency;
/// get the user and course records
if (! $user = get_record("user", "id", $data->userid) ) {
email_paypal_error_to_admin("Not a valid user id", $data);
die;
}
if (! $course = get_record("course", "id", $data->courseid) ) {
email_paypal_error_to_admin("Not a valid course id", $data);
die;
}
if (! $context = get_context_instance(CONTEXT_COURSE, $course->id)) {
email_paypal_error_to_admin("Not a valid context id", $data);
die;
}
/// Open a connection back to PayPal to validate the data
$header = '';
$header .= "POST /cgi-bin/webscr HTTP/1.0\r\n";
$header .= "Content-Type: application/x-www-form-urlencoded\r\n";
$header .= "Content-Length: " . strlen($req) . "\r\n\r\n";
$paypaladdr = empty($CFG->usepaypalsandbox) ? 'www.paypal.com' : 'www.sandbox.paypal.com';
$fp = fsockopen ($paypaladdr, 80, $errno, $errstr, 30);
if (!$fp) { /// Could not open a socket to Paypal - FAIL
echo "<p>Error: could not access paypal.com</p>";
email_paypal_error_to_admin("Could not access paypal.com to verify payment", $data);
die;
}
/// Connection is OK, so now we post the data to validate it
fputs ($fp, $header.$req);
/// Now read the response and check if everything is OK.
while (!feof($fp)) {
$result = fgets($fp, 1024);
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") {
role_unassign(0, $data->userid, 0, $context->id);
email_paypal_error_to_admin("Status not completed or pending. User unenrolled from course", $data);
die;
}
// If status is pending and reason is other than echeck then we are on hold until further notice
// Email user to let them know. Email admin.
if ($data->payment_status == "Pending" and $data->pending_reason != "echeck") {
email_to_user($user, get_admin(), "Moodle: Paypal payment", "Your Paypal payment is pending.");
email_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 = get_record("enrol_paypal", "txn_id", $data->txn_id)) { // Make sure this transaction doesn't exist already
email_paypal_error_to_admin("Transaction $data->txn_id is being repeated!", $data);
die;
}
if ($data->business != $CFG->enrol_paypalbusiness) { // Check that the email is the one we want it to be
email_paypal_error_to_admin("Business email is $data->business (not $CFG->enrol_paypalbusiness)", $data);
die;
}
if (!$user = get_record('user', 'id', $data->userid)) { // Check that user exists
email_paypal_error_to_admin("User $data->userid doesn't exist", $data);
die;
}
if (!$course = get_record('course', 'id', $data->courseid)) { // Check that course exists
email_paypal_error_to_admin("Course $data->courseid doesn't exist", $data);;
die;
}
// Check that amount paid is the correct amount
if ( (float) $course->cost < 0 ) {
$cost = (float) $CFG->enrol_cost;
} else {
$cost = (float) $course->cost;
}
$cost = format_float($cost, 2);
if ($data->payment_gross < $cost) {
email_paypal_error_to_admin("Amount paid is not enough ($data->payment_gross < $cost))", $data);
die;
}
// ALL CLEAR !
if (!insert_record("enrol_paypal", $data)) { // Insert a transaction record
email_paypal_error_to_admin("Error while trying to insert valid transaction", $data);
}
if (!enrol_into_course($course, $user, 'paypal')) {
email_paypal_error_to_admin("Error while trying to enrol ".fullname($user)." in '$course->fullname'", $data);
die;
} else {
$teacher = get_teacher($course->id);
if (!empty($CFG->enrol_mailstudents)) {
$a->coursename = "$course->fullname";
$a->profileurl = "$CFG->wwwroot/user/view.php?id=$user->id";
email_to_user($user, $teacher, get_string("enrolmentnew", '', $course->shortname),
get_string('welcometocoursetext', '', $a));
}
if (!empty($CFG->enrol_mailteachers)) {
$a->course = "$course->fullname";
$a->user = fullname($user);
email_to_user($teacher, $user, get_string("enrolmentnew", '', $course->shortname),
get_string('enrolmentnewuser', '', $a));
}
if (!empty($CFG->enrol_mailadmins)) {
$a->course = "$course->fullname";
$a->user = fullname($user);
$admins = get_admins();
foreach ($admins as $admin) {
email_to_user($admin, $user, get_string("enrolmentnew", '', $course->shortname),
get_string('enrolmentnewuser', '', $a));
}
}
}
} else if (strcmp ($result, "INVALID") == 0) { // ERROR
insert_record("enrol_paypal", $data, false);
email_paypal_error_to_admin("Received an invalid payment notification!! (Fake payment?)", $data);
}
}
fclose($fp);
exit;
/// FUNCTIONS //////////////////////////////////////////////////////////////////
function email_paypal_error_to_admin($subject, $data) {
$admin = get_admin();
$site = get_site();
$message = "$site->fullname: Transaction failed.\n\n$subject\n\n";
foreach ($data as $key => $value) {
$message .= "$key => $value\n";
}
email_to_user($admin, $admin, "PAYPAL ERROR: ".$subject, $message);
}
?>