mirror of
https://github.com/moodle/moodle.git
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215 lines
7.6 KiB
PHP
215 lines
7.6 KiB
PHP
<?php // $Id$
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/**
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* Listens for Instant Payment Notification from Paypal
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*
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* This script waits for Payment notification from Paypal,
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* then double checks that data by sending it back to Paypal.
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* If Paypal verifies this then it sets up the enrolment for that
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*
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* Set the $user->timeaccess course array
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*
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* @param user referenced object, must contain $user->id already set
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*/
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require("../../config.php");
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require("enrol.php");
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/// Keep out casual intruders
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if (empty($_POST) or !empty($_GET)) {
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error("Sorry, you can not use the script that way.");
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}
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/// Read all the data from Paypal and get it ready for later
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$req = 'cmd=_notify-validate';
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foreach ($_POST as $key => $value) {
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$value = urlencode(stripslashes($value));
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$req .= "&$key=$value";
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$data->$key = urldecode($value);
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}
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$custom = explode('-', $data->custom);
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$data->userid = $custom[0];
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$data->courseid = $custom[1];
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$data->payment_gross = $data->mc_gross;
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$data->payment_currency = $data->mc_currency;
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/// get the user and course records
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if (! $user = get_record("user", "id", $data->userid) ) {
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email_paypal_error_to_admin("Not a valid user id", $data);
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die;
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}
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if (! $course = get_record("course", "id", $data->courseid) ) {
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email_paypal_error_to_admin("Not a valid course id", $data);
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die;
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}
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/// Open a connection back to PayPal to validate the data
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$header = '';
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$header .= "POST /cgi-bin/webscr HTTP/1.0\r\n";
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$header .= "Content-Type: application/x-www-form-urlencoded\r\n";
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$header .= "Content-Length: " . strlen($req) . "\r\n\r\n";
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$fp = fsockopen ('www.paypal.com', 80, $errno, $errstr, 30);
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if (!$fp) { /// Could not open a socket to Paypal - FAIL
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echo "<p>Error: could not access paypal.com</p>";
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email_paypal_error_to_admin("Could not access paypal.com to verify payment", $data);
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die;
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}
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/// Connection is OK, so now we post the data to validate it
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fputs ($fp, $header.$req);
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/// Now read the response and check if everything is OK.
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while (!feof($fp)) {
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$result = fgets($fp, 1024);
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if (strcmp($result, "VERIFIED") == 0) { // VALID PAYMENT!
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// check the payment_status and payment_reason
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// If status is not completed or pending then unenrol the student if already enrolled
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// and notify admin
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if ($data->payment_status != "Completed" and $data->payment_status != "Pending") {
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unenrol_student($data->userid, $data->courseid);
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email_paypal_error_to_admin("Status not completed or pending. User unenrolled from course", $data);
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die;
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}
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// If status is pending and reason is other than echeck then we are on hold until further notice
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// Email user to let them know. Email admin.
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if ($data->payment_status == "Pending" and $data->pending_reason != "echeck") {
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email_to_user($user, getadmin(), "Moodle: Paypal payment", "Your Paypal payment is pending.");
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email_paypal_error_to_admin("Payment pending", $data);
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die;
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}
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// If our status is not completed or not pending on an echeck clearance then ignore and die
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// This check is redundant at present but may be useful if paypal extend the return codes in the future
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if (! ( $data->payment_status == "Completed" or
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($data->payment_status == "Pending" and $data->pending_reason == "echeck") ) ) {
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die;
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}
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// At this point we only proceed with a status of completed or pending with a reason of echeck
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if ($existing = get_record("enrol_paypal", "txn_id", $data->txn_id)) { // Make sure this transaction doesn't exist already
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email_paypal_error_to_admin("Transaction $data->txn_id is being repeated!", $data);
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die;
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}
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if ($data->business != $CFG->enrol_paypalbusiness) { // Check that the email is the one we want it to be
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email_paypal_error_to_admin("Business email is $data->business (not $CFG->enrol_paypalbusiness)", $data);
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die;
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}
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if (!$user = get_record('user', 'id', $data->userid)) { // Check that user exists
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email_paypal_error_to_admin("User $data->userid doesn't exist", $data);
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die;
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}
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if (!$course = get_record('course', 'id', $data->courseid)) { // Check that course exists
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email_paypal_error_to_admin("Course $data->courseid doesn't exist", $data);;
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die;
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}
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// Check that amount paid is the correct amount
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if ( (float) $course->cost < 0 ) {
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$cost = (float) $CFG->enrol_cost;
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} else {
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$cost = (float) $course->cost;
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}
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$cost = format_float($cost, 2);
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if ($data->payment_gross < $cost) {
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email_paypal_error_to_admin("Amount paid is not enough ($data->payment_gross < $cost))", $data);
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die;
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}
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// ALL CLEAR !
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if (!insert_record("enrol_paypal", $data)) { // Insert a transaction record
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email_paypal_error_to_admin("Error while trying to insert valid transaction", $data);
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}
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if (!enrol_student($user->id, $course->id)) { // Enrol the student
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email_paypal_error_to_admin("Error while trying to enrol ".fullname($user)." in '$course->fullname'", $data);
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die;
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} else {
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$teacher = get_teacher($course->id);
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if (!empty($CFG->enrol_mailstudents)) {
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$a->coursename = "$course->fullname";
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$a->profileurl = "$CFG->wwwroot/user/view.php?id=$user->id";
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email_to_user($user, $teacher, get_string("enrolmentnew", '', $course->shortname),
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get_string('welcometocoursetext', '', $a));
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}
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if (!empty($CFG->enrol_mailteachers)) {
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$a->course = "$course->fullname";
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$a->user = fullname($user);
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email_to_user($teacher, $user, get_string("enrolmentnew", '', $course->shortname),
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get_string('enrolmentnewuser', '', $a));
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}
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if (!empty($CFG->enrol_mailadmins)) {
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$a->course = "$course->fullname";
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$a->user = fullname($user);
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$admins = get_admins();
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foreach ($admins as $admin) {
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email_to_user($admin, $user, get_string("enrolmentnew", '', $course->shortname),
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get_string('enrolmentnewuser', '', $a));
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}
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}
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}
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} else if (strcmp ($result, "INVALID") == 0) { // ERROR
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insert_record("enrol_paypal", $data);
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email_paypal_error_to_admin("Received an invalid payment notification!! (Fake payment?)", $data);
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}
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}
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fclose($fp);
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exit;
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/// FUNCTIONS //////////////////////////////////////////////////////////////////
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function email_paypal_error_to_admin($subject, $data) {
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$admin = get_admin();
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$site = get_admin();
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$message = "$site->fullname: Transaction failed.\n\n$subject\n\n";
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foreach ($data as $key => $value) {
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$message .= "$key => $value\n";
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}
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email_to_user($admin, $admin, "PAYPAL ERROR: ".$subject, $message);
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}
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?>
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