/enrol/paypal/ipn.php
PHP | 232 lines | 138 code | 62 blank | 32 comment | 38 complexity | 0997165ee4ec814c1afdcd7bdb7c0ab5 MD5 | raw file
- <?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;
- /// we expect only valid UTF-8 encoding, it is the responsibility
- /// of user to set it up properly in PayPal business acount,
- /// it is documented in docs wiki.
- $req = 'cmd=_notify-validate';
- $data = new object();
- foreach ($_POST as $key => $value) {
- $value = stripslashes($value);
- $req .= "&$key=".urlencode($value);
- $data->$key = $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;
- $data->timeupdated = time();
- /// 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", $data);
- die;
- }
- // If currency is incorrectly set then someone maybe trying to cheat the system
- if ($data->mc_currency != $course->currency) {
- email_paypal_error_to_admin("Currency does not match course settings, received: ".addslashes($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 $data->pending_reason != "echeck") {
- email_to_user($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", addslashes($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) $course->cost;
- }
- if ($data->payment_gross < $cost) {
- $cost = format_float($cost, 2);
- email_paypal_error_to_admin("Amount paid is not enough ($data->payment_gross < $cost))", $data);
- die;
- }
- // ALL CLEAR !
- if (!insert_record("enrol_paypal", addslashes_object($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", addslashes_object($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);
- }
- ?>