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Differences Between: [Versions 310 and 403] [Versions 39 and 403]

   1  <?php
   2  // This file is part of Moodle - http://moodle.org/
   3  //
   4  // Moodle is free software: you can redistribute it and/or modify
   5  // it under the terms of the GNU General Public License as published by
   6  // the Free Software Foundation, either version 3 of the License, or
   7  // (at your option) any later version.
   8  //
   9  // Moodle is distributed in the hope that it will be useful,
  10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  // GNU General Public License for more details.
  13  //
  14  // You should have received a copy of the GNU General Public License
  15  // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  16  
  17  /**
  18   * Listens for Instant Payment Notification from PayPal
  19   *
  20   * This script waits for Payment notification from PayPal,
  21   * then double checks that data by sending it back to PayPal.
  22   * If PayPal verifies this then it sets up the enrolment for that
  23   * user.
  24   *
  25   * @package    enrol_paypal
  26   * @copyright 2010 Eugene Venter
  27   * @author     Eugene Venter - based on code by others
  28   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  29   */
  30  
  31  // Disable moodle specific debug messages and any errors in output,
  32  // comment out when debugging or better look into error log!
  33  define('NO_DEBUG_DISPLAY', true);
  34  
  35  // This script does not require login.
  36  require("../../config.php"); // phpcs:ignore
  37  require_once ("lib.php");
  38  require_once($CFG->libdir.'/enrollib.php');
  39  require_once($CFG->libdir . '/filelib.php');
  40  
  41  // PayPal does not like when we return error messages here,
  42  // the custom handler just logs exceptions and stops.
  43  set_exception_handler(\enrol_paypal\util::get_exception_handler());
  44  
  45  // Make sure we are enabled in the first place.
  46  if (!enrol_is_enabled('paypal')) {
  47      http_response_code(503);
  48      throw new moodle_exception('errdisabled', 'enrol_paypal');
  49  }
  50  
  51  /// Keep out casual intruders
  52  if (empty($_POST) or !empty($_GET)) {
  53      http_response_code(400);
  54      throw new moodle_exception('invalidrequest', 'core_error');
  55  }
  56  
  57  /// Read all the data from PayPal and get it ready for later;
  58  /// we expect only valid UTF-8 encoding, it is the responsibility
  59  /// of user to set it up properly in PayPal business account,
  60  /// it is documented in docs wiki.
  61  
  62  $req = 'cmd=_notify-validate';
  63  
  64  $data = new stdClass();
  65  
  66  foreach ($_POST as $key => $value) {
  67      if ($key !== clean_param($key, PARAM_ALPHANUMEXT)) {
  68          throw new moodle_exception('invalidrequest', 'core_error', '', null, $key);
  69      }
  70      if (is_array($value)) {
  71          throw new moodle_exception('invalidrequest', 'core_error', '', null, 'Unexpected array param: '.$key);
  72      }
  73      $req .= "&$key=".urlencode($value);
  74      $data->$key = fix_utf8($value);
  75  }
  76  
  77  if (empty($data->custom)) {
  78      throw new moodle_exception('invalidrequest', 'core_error', '', null, 'Missing request param: custom');
  79  }
  80  
  81  $custom = explode('-', $data->custom);
  82  unset($data->custom);
  83  
  84  if (empty($custom) || count($custom) < 3) {
  85      throw new moodle_exception('invalidrequest', 'core_error', '', null, 'Invalid value of the request param: custom');
  86  }
  87  
  88  $data->userid           = (int)$custom[0];
  89  $data->courseid         = (int)$custom[1];
  90  $data->instanceid       = (int)$custom[2];
  91  $data->payment_gross    = $data->mc_gross;
  92  $data->payment_currency = $data->mc_currency;
  93  $data->timeupdated      = time();
  94  
  95  $user = $DB->get_record("user", array("id" => $data->userid), "*", MUST_EXIST);
  96  $course = $DB->get_record("course", array("id" => $data->courseid), "*", MUST_EXIST);
  97  $context = context_course::instance($course->id, MUST_EXIST);
  98  
  99  $PAGE->set_context($context);
 100  
 101  $plugin_instance = $DB->get_record("enrol", array("id" => $data->instanceid, "enrol" => "paypal", "status" => 0), "*", MUST_EXIST);
 102  $plugin = enrol_get_plugin('paypal');
 103  
 104  /// Open a connection back to PayPal to validate the data
 105  $paypaladdr = empty($CFG->usepaypalsandbox) ? 'ipnpb.paypal.com' : 'ipnpb.sandbox.paypal.com';
 106  $c = new curl();
 107  $options = array(
 108      'returntransfer' => true,
 109      'httpheader' => array('application/x-www-form-urlencoded', "Host: $paypaladdr"),
 110      'timeout' => 30,
 111      'CURLOPT_HTTP_VERSION' => CURL_HTTP_VERSION_1_1,
 112  );
 113  $location = "https://$paypaladdr/cgi-bin/webscr";
 114  $result = $c->post($location, $req, $options);
 115  
 116  if ($c->get_errno()) {
 117      throw new moodle_exception('errpaypalconnect', 'enrol_paypal', '', array('url' => $paypaladdr, 'result' => $result),
 118          json_encode($data));
 119  }
 120  
 121  /// Connection is OK, so now we post the data to validate it
 122  
 123  /// Now read the response and check if everything is OK.
 124  
 125  if (strlen($result) > 0) {
 126      if (strcmp($result, "VERIFIED") == 0) {          // VALID PAYMENT!
 127  
 128  
 129          // check the payment_status and payment_reason
 130  
 131          // If status is not completed or pending then unenrol the student if already enrolled
 132          // and notify admin
 133  
 134          if ($data->payment_status != "Completed" and $data->payment_status != "Pending") {
 135              $plugin->unenrol_user($plugin_instance, $data->userid);
 136              \enrol_paypal\util::message_paypal_error_to_admin("Status not completed or pending. User unenrolled from course",
 137                                                                $data);
 138              die;
 139          }
 140  
 141          // If currency is incorrectly set then someone maybe trying to cheat the system
 142  
 143          if ($data->mc_currency != $plugin_instance->currency) {
 144              \enrol_paypal\util::message_paypal_error_to_admin(
 145                  "Currency does not match course settings, received: ".$data->mc_currency,
 146                  $data);
 147              die;
 148          }
 149  
 150          // If status is pending and reason is other than echeck then we are on hold until further notice
 151          // Email user to let them know. Email admin.
 152  
 153          if ($data->payment_status == "Pending" and $data->pending_reason != "echeck") {
 154              $eventdata = new \core\message\message();
 155              $eventdata->courseid          = empty($data->courseid) ? SITEID : $data->courseid;
 156              $eventdata->modulename        = 'moodle';
 157              $eventdata->component         = 'enrol_paypal';
 158              $eventdata->name              = 'paypal_enrolment';
 159              $eventdata->userfrom          = get_admin();
 160              $eventdata->userto            = $user;
 161              $eventdata->subject           = "Moodle: PayPal payment";
 162              $eventdata->fullmessage       = "Your PayPal payment is pending.";
 163              $eventdata->fullmessageformat = FORMAT_PLAIN;
 164              $eventdata->fullmessagehtml   = '';
 165              $eventdata->smallmessage      = '';
 166              message_send($eventdata);
 167  
 168              \enrol_paypal\util::message_paypal_error_to_admin("Payment pending", $data);
 169              die;
 170          }
 171  
 172          // If our status is not completed or not pending on an echeck clearance then ignore and die
 173          // This check is redundant at present but may be useful if paypal extend the return codes in the future
 174  
 175          if (! ( $data->payment_status == "Completed" or
 176                 ($data->payment_status == "Pending" and $data->pending_reason == "echeck") ) ) {
 177              die;
 178          }
 179  
 180          // At this point we only proceed with a status of completed or pending with a reason of echeck
 181  
 182          // Make sure this transaction doesn't exist already.
 183          if ($existing = $DB->get_record("enrol_paypal", array("txn_id" => $data->txn_id), "*", IGNORE_MULTIPLE)) {
 184              \enrol_paypal\util::message_paypal_error_to_admin("Transaction $data->txn_id is being repeated!", $data);
 185              die;
 186          }
 187  
 188          // Check that the receiver email is the one we want it to be.
 189          if (isset($data->business)) {
 190              $recipient = $data->business;
 191          } else if (isset($data->receiver_email)) {
 192              $recipient = $data->receiver_email;
 193          } else {
 194              $recipient = 'empty';
 195          }
 196  
 197          if (core_text::strtolower($recipient) !== core_text::strtolower($plugin->get_config('paypalbusiness'))) {
 198              \enrol_paypal\util::message_paypal_error_to_admin("Business email is {$recipient} (not ".
 199                      $plugin->get_config('paypalbusiness').")", $data);
 200              die;
 201          }
 202  
 203          if (!$user = $DB->get_record('user', array('id'=>$data->userid))) {   // Check that user exists
 204              \enrol_paypal\util::message_paypal_error_to_admin("User $data->userid doesn't exist", $data);
 205              die;
 206          }
 207  
 208          if (!$course = $DB->get_record('course', array('id'=>$data->courseid))) { // Check that course exists
 209              \enrol_paypal\util::message_paypal_error_to_admin("Course $data->courseid doesn't exist", $data);
 210              die;
 211          }
 212  
 213          $coursecontext = context_course::instance($course->id, IGNORE_MISSING);
 214  
 215          // Check that amount paid is the correct amount
 216          if ( (float) $plugin_instance->cost <= 0 ) {
 217              $cost = (float) $plugin->get_config('cost');
 218          } else {
 219              $cost = (float) $plugin_instance->cost;
 220          }
 221  
 222          // Use the same rounding of floats as on the enrol form.
 223          $cost = format_float($cost, 2, false);
 224  
 225          if ($data->payment_gross < $cost) {
 226              \enrol_paypal\util::message_paypal_error_to_admin("Amount paid is not enough ($data->payment_gross < $cost))", $data);
 227              die;
 228  
 229          }
 230          // Use the queried course's full name for the item_name field.
 231          $data->item_name = $course->fullname;
 232  
 233          // ALL CLEAR !
 234  
 235          $DB->insert_record("enrol_paypal", $data);
 236  
 237          if ($plugin_instance->enrolperiod) {
 238              $timestart = time();
 239              $timeend   = $timestart + $plugin_instance->enrolperiod;
 240          } else {
 241              $timestart = 0;
 242              $timeend   = 0;
 243          }
 244  
 245          // Enrol user
 246          $plugin->enrol_user($plugin_instance, $user->id, $plugin_instance->roleid, $timestart, $timeend);
 247  
 248          // Pass $view=true to filter hidden caps if the user cannot see them
 249          if ($users = get_users_by_capability($context, 'moodle/course:update', 'u.*', 'u.id ASC',
 250                                               '', '', '', '', false, true)) {
 251              $users = sort_by_roleassignment_authority($users, $context);
 252              $teacher = array_shift($users);
 253          } else {
 254              $teacher = false;
 255          }
 256  
 257          $mailstudents = $plugin->get_config('mailstudents');
 258          $mailteachers = $plugin->get_config('mailteachers');
 259          $mailadmins   = $plugin->get_config('mailadmins');
 260          $shortname = format_string($course->shortname, true, array('context' => $context));
 261  
 262  
 263          if (!empty($mailstudents)) {
 264              $a = new stdClass();
 265              $a->coursename = format_string($course->fullname, true, array('context' => $coursecontext));
 266              $a->profileurl = "$CFG->wwwroot/user/view.php?id=$user->id";
 267  
 268              $eventdata = new \core\message\message();
 269              $eventdata->courseid          = $course->id;
 270              $eventdata->modulename        = 'moodle';
 271              $eventdata->component         = 'enrol_paypal';
 272              $eventdata->name              = 'paypal_enrolment';
 273              $eventdata->userfrom          = empty($teacher) ? core_user::get_noreply_user() : $teacher;
 274              $eventdata->userto            = $user;
 275              $eventdata->subject           = get_string("enrolmentnew", 'enrol', $shortname);
 276              $eventdata->fullmessage       = get_string('welcometocoursetext', '', $a);
 277              $eventdata->fullmessageformat = FORMAT_PLAIN;
 278              $eventdata->fullmessagehtml   = '';
 279              $eventdata->smallmessage      = '';
 280              message_send($eventdata);
 281  
 282          }
 283  
 284          if (!empty($mailteachers) && !empty($teacher)) {
 285              $a->course = format_string($course->fullname, true, array('context' => $coursecontext));
 286              $a->user = fullname($user);
 287  
 288              $eventdata = new \core\message\message();
 289              $eventdata->courseid          = $course->id;
 290              $eventdata->modulename        = 'moodle';
 291              $eventdata->component         = 'enrol_paypal';
 292              $eventdata->name              = 'paypal_enrolment';
 293              $eventdata->userfrom          = $user;
 294              $eventdata->userto            = $teacher;
 295              $eventdata->subject           = get_string("enrolmentnew", 'enrol', $shortname);
 296              $eventdata->fullmessage       = get_string('enrolmentnewuser', 'enrol', $a);
 297              $eventdata->fullmessageformat = FORMAT_PLAIN;
 298              $eventdata->fullmessagehtml   = '';
 299              $eventdata->smallmessage      = '';
 300              message_send($eventdata);
 301          }
 302  
 303          if (!empty($mailadmins)) {
 304              $a->course = format_string($course->fullname, true, array('context' => $coursecontext));
 305              $a->user = fullname($user);
 306              $admins = get_admins();
 307              foreach ($admins as $admin) {
 308                  $eventdata = new \core\message\message();
 309                  $eventdata->courseid          = $course->id;
 310                  $eventdata->modulename        = 'moodle';
 311                  $eventdata->component         = 'enrol_paypal';
 312                  $eventdata->name              = 'paypal_enrolment';
 313                  $eventdata->userfrom          = $user;
 314                  $eventdata->userto            = $admin;
 315                  $eventdata->subject           = get_string("enrolmentnew", 'enrol', $shortname);
 316                  $eventdata->fullmessage       = get_string('enrolmentnewuser', 'enrol', $a);
 317                  $eventdata->fullmessageformat = FORMAT_PLAIN;
 318                  $eventdata->fullmessagehtml   = '';
 319                  $eventdata->smallmessage      = '';
 320                  message_send($eventdata);
 321              }
 322          }
 323  
 324      } else if (strcmp ($result, "INVALID") == 0) { // ERROR
 325          $DB->insert_record("enrol_paypal", $data, false);
 326          throw new moodle_exception('erripninvalid', 'enrol_paypal', '', null, json_encode($data));
 327      }
 328  }