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   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  /**
  19   * A form for the creation and editing of groups.
  20   *
  21   * @copyright 2006 The Open University, N.D.Freear AT open.ac.uk, J.White AT open.ac.uk
  22   * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  23   * @package   core_group
  24   */
  25  
  26  defined('MOODLE_INTERNAL') || die;
  27  
  28  require_once($CFG->dirroot.'/lib/formslib.php');
  29  
  30  /**
  31   * Group form class
  32   *
  33   * @copyright 2006 The Open University, N.D.Freear AT open.ac.uk, J.White AT open.ac.uk
  34   * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  35   * @package   core_group
  36   */
  37  class group_form extends moodleform {
  38  
  39      /**
  40       * Definition of the form
  41       */
  42      function definition () {
  43          global $USER, $CFG, $COURSE;
  44          $coursecontext = context_course::instance($COURSE->id);
  45  
  46          $mform =& $this->_form;
  47          $editoroptions = $this->_customdata['editoroptions'];
  48  
  49          $mform->addElement('header', 'general', get_string('general', 'form'));
  50  
  51          $mform->addElement('text','name', get_string('groupname', 'group'),'maxlength="254" size="50"');
  52          $mform->addRule('name', get_string('required'), 'required', null, 'client');
  53          $mform->setType('name', PARAM_TEXT);
  54  
  55          $mform->addElement('text','idnumber', get_string('idnumbergroup'), 'maxlength="100" size="10"');
  56          $mform->addHelpButton('idnumber', 'idnumbergroup');
  57          $mform->setType('idnumber', PARAM_RAW);
  58          if (!has_capability('moodle/course:changeidnumber', $coursecontext)) {
  59              $mform->hardFreeze('idnumber');
  60          }
  61  
  62          $mform->addElement('editor', 'description_editor', get_string('groupdescription', 'group'), null, $editoroptions);
  63          $mform->setType('description_editor', PARAM_RAW);
  64  
  65          $mform->addElement('passwordunmask', 'enrolmentkey', get_string('enrolmentkey', 'group'), 'maxlength="254" size="24"', get_string('enrolmentkey', 'group'));
  66          $mform->addHelpButton('enrolmentkey', 'enrolmentkey', 'group');
  67          $mform->setType('enrolmentkey', PARAM_RAW);
  68  
  69          $mform->addElement('static', 'currentpicture', get_string('currentpicture'));
  70  
  71          $mform->addElement('checkbox', 'deletepicture', get_string('delete'));
  72          $mform->setDefault('deletepicture', 0);
  73  
  74          $options = array(get_string('no'), get_string('yes'));
  75          $mform->addElement('select', 'hidepicture', get_string('hidepicture'), $options);
  76  
  77          $mform->addElement('filepicker', 'imagefile', get_string('newpicture', 'group'));
  78          $mform->addHelpButton('imagefile', 'newpicture', 'group');
  79  
  80          $mform->addElement('hidden','id');
  81          $mform->setType('id', PARAM_INT);
  82  
  83          $mform->addElement('hidden','courseid');
  84          $mform->setType('courseid', PARAM_INT);
  85  
  86          $this->add_action_buttons();
  87      }
  88  
  89      /**
  90       * Extend the form definition after the data has been parsed.
  91       */
  92      public function definition_after_data() {
  93          global $COURSE, $DB;
  94  
  95          $mform = $this->_form;
  96          $groupid = $mform->getElementValue('id');
  97  
  98          if ($group = $DB->get_record('groups', array('id' => $groupid))) {
  99  
 100              // Print picture.
 101              if (!($pic = print_group_picture($group, $COURSE->id, true, true, false))) {
 102                  $pic = get_string('none');
 103                  if ($mform->elementExists('deletepicture')) {
 104                      $mform->removeElement('deletepicture');
 105                  }
 106              }
 107              $imageelement = $mform->getElement('currentpicture');
 108              $imageelement->setValue($pic);
 109          } else {
 110              if ($mform->elementExists('currentpicture')) {
 111                  $mform->removeElement('currentpicture');
 112              }
 113              if ($mform->elementExists('deletepicture')) {
 114                  $mform->removeElement('deletepicture');
 115              }
 116          }
 117  
 118      }
 119  
 120      /**
 121       * Form validation
 122       *
 123       * @param array $data
 124       * @param array $files
 125       * @return array $errors An array of errors
 126       */
 127      function validation($data, $files) {
 128          global $COURSE, $DB, $CFG;
 129  
 130          $errors = parent::validation($data, $files);
 131  
 132          $name = trim($data['name']);
 133          if (isset($data['idnumber'])) {
 134              $idnumber = trim($data['idnumber']);
 135          } else {
 136              $idnumber = '';
 137          }
 138          if ($data['id'] and $group = $DB->get_record('groups', array('id'=>$data['id']))) {
 139              if (core_text::strtolower($group->name) != core_text::strtolower($name)) {
 140                  if (groups_get_group_by_name($COURSE->id,  $name)) {
 141                      $errors['name'] = get_string('groupnameexists', 'group', $name);
 142                  }
 143              }
 144              if (!empty($idnumber) && $group->idnumber != $idnumber) {
 145                  if (groups_get_group_by_idnumber($COURSE->id, $idnumber)) {
 146                      $errors['idnumber']= get_string('idnumbertaken');
 147                  }
 148              }
 149  
 150              if ($data['enrolmentkey'] != '') {
 151                  $errmsg = '';
 152                  if (!empty($CFG->groupenrolmentkeypolicy) && $group->enrolmentkey !== $data['enrolmentkey']
 153                          && !check_password_policy($data['enrolmentkey'], $errmsg)) {
 154                      // Enforce password policy when the password is changed.
 155                      $errors['enrolmentkey'] = $errmsg;
 156                  } else {
 157                      // Prevent twice the same enrolment key in course groups.
 158                      $sql = "SELECT id FROM {groups} WHERE id <> :groupid AND courseid = :courseid AND enrolmentkey = :key";
 159                      $params = array('groupid' => $data['id'], 'courseid' => $COURSE->id, 'key' => $data['enrolmentkey']);
 160                      if ($DB->record_exists_sql($sql, $params)) {
 161                          $errors['enrolmentkey'] = get_string('enrolmentkeyalreadyinuse', 'group');
 162                      }
 163                  }
 164              }
 165  
 166          } else if (groups_get_group_by_name($COURSE->id, $name)) {
 167              $errors['name'] = get_string('groupnameexists', 'group', $name);
 168          } else if (!empty($idnumber) && groups_get_group_by_idnumber($COURSE->id, $idnumber)) {
 169              $errors['idnumber']= get_string('idnumbertaken');
 170          } else if ($data['enrolmentkey'] != '') {
 171              $errmsg = '';
 172              if (!empty($CFG->groupenrolmentkeypolicy) && !check_password_policy($data['enrolmentkey'], $errmsg)) {
 173                  // Enforce password policy.
 174                  $errors['enrolmentkey'] = $errmsg;
 175              } else if ($DB->record_exists('groups', array('courseid' => $COURSE->id, 'enrolmentkey' => $data['enrolmentkey']))) {
 176                  // Prevent the same enrolment key from being used multiple times in course groups.
 177                  $errors['enrolmentkey'] = get_string('enrolmentkeyalreadyinuse', 'group');
 178              }
 179          }
 180  
 181          return $errors;
 182      }
 183  
 184      /**
 185       * Get editor options for this form
 186       *
 187       * @return array An array of options
 188       */
 189      function get_editor_options() {
 190          return $this->_customdata['editoroptions'];
 191      }
 192  }