/enrol/paypal/ipn.php
PHP | 327 lines | 208 code | 68 blank | 51 comment | 38 complexity | 917a53f6f661fd151ec8d70e1bc98a0e MD5 | raw file
- <?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');
- /// 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 = get_context_instance(CONTEXT_COURSE, $course->id)) {
- 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
- $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>";
- message_paypal_error_to_admin("Could not access paypal.com to verify payment", $data);
- die;
- }
- /// Connection is OK, so now we post the data to validate it
- fputs ($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") {
- $plugin->unenrol_user($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;
- }
- // 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 = $plugin->get_config('mailadmins');
- if (!empty($mailstudents)) {
- $a->coursename = $course->fullname;
- $a->profileurl = "$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", '', $course->shortname);
- $eventdata->fullmessage = get_string('welcometocoursetext', '', $a);
- $eventdata->fullmessageformat = FORMAT_PLAIN;
- $eventdata->fullmessagehtml = '';
- $eventdata->smallmessage = '';
- message_send($eventdata);
- }
- if (!empty($mailteachers)) {
- $a->course = $course->fullname;
- $a->user = fullname($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", '', $course->shortname);
- $eventdata->fullmessage = get_string('enrolmentnewuser', '', $a);
- $eventdata->fullmessageformat = FORMAT_PLAIN;
- $eventdata->fullmessagehtml = '';
- $eventdata->smallmessage = '';
- message_send($eventdata);
- }
- if (!empty($mailadmins)) {
- $a->course = $course->fullname;
- $a->user = fullname($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", '', $course->shortname);
- $eventdata->fullmessage = get_string('enrolmentnewuser', '', $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?)", $data);
- }
- }
- fclose($fp);
- 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);
- }