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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   * Page for editing questions.
  19   *
  20   * @package    moodlecore
  21   * @subpackage questionbank
  22   * @copyright  1999 onwards Martin Dougiamas {@link http://moodle.com}
  23   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  24   */
  25  
  26  
  27  require_once(__DIR__ . '/../config.php');
  28  require_once (__DIR__ . '/editlib.php');
  29  require_once($CFG->libdir . '/filelib.php');
  30  require_once($CFG->libdir . '/formslib.php');
  31  
  32  // Read URL parameters telling us which question to edit.
  33  $id = optional_param('id', 0, PARAM_INT); // question id
  34  $makecopy = optional_param('makecopy', 0, PARAM_BOOL);
  35  $qtype = optional_param('qtype', '', PARAM_FILE);
  36  $categoryid = optional_param('category', 0, PARAM_INT);
  37  $cmid = optional_param('cmid', 0, PARAM_INT);
  38  $courseid = optional_param('courseid', 0, PARAM_INT);
  39  $wizardnow = optional_param('wizardnow', '', PARAM_ALPHA);
  40  $originalreturnurl = optional_param('returnurl', 0, PARAM_LOCALURL);
  41  $appendqnumstring = optional_param('appendqnumstring', '', PARAM_ALPHA);
  42  $inpopup = optional_param('inpopup', 0, PARAM_BOOL);
  43  $scrollpos = optional_param('scrollpos', 0, PARAM_INT);
  44  
  45  $url = new moodle_url('/question/question.php');
  46  if ($id !== 0) {
  47      $url->param('id', $id);
  48  }
  49  if ($makecopy) {
  50      $url->param('makecopy', $makecopy);
  51  }
  52  if ($qtype !== '') {
  53      $url->param('qtype', $qtype);
  54  }
  55  if ($categoryid !== 0) {
  56      $url->param('category', $categoryid);
  57  }
  58  if ($cmid !== 0) {
  59      $url->param('cmid', $cmid);
  60  }
  61  if ($courseid !== 0) {
  62      $url->param('courseid', $courseid);
  63  }
  64  if ($wizardnow !== '') {
  65      $url->param('wizardnow', $wizardnow);
  66  }
  67  if ($originalreturnurl !== 0) {
  68      $url->param('returnurl', $originalreturnurl);
  69  }
  70  if ($appendqnumstring !== '') {
  71      $url->param('appendqnumstring', $appendqnumstring);
  72  }
  73  if ($inpopup !== 0) {
  74      $url->param('inpopup', $inpopup);
  75  }
  76  if ($scrollpos) {
  77      $url->param('scrollpos', $scrollpos);
  78  }
  79  $PAGE->set_url($url);
  80  
  81  if ($cmid) {
  82      $questionbankurl = new moodle_url('/question/edit.php', array('cmid' => $cmid));
  83  } else {
  84      $questionbankurl = new moodle_url('/question/edit.php', array('courseid' => $courseid));
  85  }
  86  navigation_node::override_active_url($questionbankurl);
  87  
  88  if ($originalreturnurl) {
  89      if (strpos($originalreturnurl, '/') !== 0) {
  90          throw new coding_exception("returnurl must be a local URL starting with '/'. $originalreturnurl was given.");
  91      }
  92      $returnurl = new moodle_url($originalreturnurl);
  93  } else {
  94      $returnurl = $questionbankurl;
  95  }
  96  if ($scrollpos) {
  97      $returnurl->param('scrollpos', $scrollpos);
  98  }
  99  
 100  if ($cmid){
 101      list($module, $cm) = get_module_from_cmid($cmid);
 102      require_login($cm->course, false, $cm);
 103      $thiscontext = context_module::instance($cmid);
 104  } elseif ($courseid) {
 105      require_login($courseid, false);
 106      $thiscontext = context_course::instance($courseid);
 107      $module = null;
 108      $cm = null;
 109  } else {
 110      print_error('missingcourseorcmid', 'question');
 111  }
 112  $contexts = new question_edit_contexts($thiscontext);
 113  $PAGE->set_pagelayout('admin');
 114  
 115  if (optional_param('addcancel', false, PARAM_BOOL)) {
 116      redirect($returnurl);
 117  }
 118  
 119  if ($id) {
 120      if (!$question = $DB->get_record('question', array('id' => $id))) {
 121          print_error('questiondoesnotexist', 'question', $returnurl);
 122      }
 123      get_question_options($question, true);
 124  
 125  } else if ($categoryid && $qtype) { // only for creating new questions
 126      $question = new stdClass();
 127      $question->category = $categoryid;
 128      $question->qtype = $qtype;
 129      $question->createdby = $USER->id;
 130  
 131      // Check that users are allowed to create this question type at the moment.
 132      if (!question_bank::qtype_enabled($qtype)) {
 133          print_error('cannotenable', 'question', $returnurl, $qtype);
 134      }
 135  
 136  } else if ($categoryid) {
 137      // Category, but no qtype. They probably came from the addquestion.php
 138      // script without choosing a question type. Send them back.
 139      $addurl = new moodle_url('/question/addquestion.php', $url->params());
 140      $addurl->param('validationerror', 1);
 141      redirect($addurl);
 142  
 143  } else {
 144      print_error('notenoughdatatoeditaquestion', 'question', $returnurl);
 145  }
 146  
 147  $qtypeobj = question_bank::get_qtype($question->qtype);
 148  
 149  // Validate the question category.
 150  if (!$category = $DB->get_record('question_categories', array('id' => $question->category))) {
 151      print_error('categorydoesnotexist', 'question', $returnurl);
 152  }
 153  
 154  // Check permissions
 155  $question->formoptions = new stdClass();
 156  
 157  $categorycontext = context::instance_by_id($category->contextid);
 158  $addpermission = has_capability('moodle/question:add', $categorycontext);
 159  
 160  if ($id) {
 161      $question->formoptions->canedit = question_has_capability_on($question, 'edit');
 162      $question->formoptions->canmove = $addpermission && question_has_capability_on($question, 'move');
 163      $question->formoptions->cansaveasnew = $addpermission &&
 164              (question_has_capability_on($question, 'view') || $question->formoptions->canedit);
 165      $question->formoptions->repeatelements = $question->formoptions->canedit || $question->formoptions->cansaveasnew;
 166      $formeditable =  $question->formoptions->canedit || $question->formoptions->cansaveasnew || $question->formoptions->canmove;
 167      if (!$formeditable) {
 168          question_require_capability_on($question, 'view');
 169      }
 170      if ($makecopy) {
 171          // If we are duplicating a question, add some indication to the question name.
 172          $question->name = get_string('questionnamecopy', 'question', $question->name);
 173          $question->beingcopied = true;
 174      }
 175  
 176  } else  { // creating a new question
 177      $question->formoptions->canedit = question_has_capability_on($question, 'edit');
 178      $question->formoptions->canmove = (question_has_capability_on($question, 'move') && $addpermission);
 179      $question->formoptions->cansaveasnew = false;
 180      $question->formoptions->repeatelements = true;
 181      $formeditable = true;
 182      require_capability('moodle/question:add', $categorycontext);
 183  }
 184  $question->formoptions->mustbeusable = (bool) $appendqnumstring;
 185  
 186  // Validate the question type.
 187  $PAGE->set_pagetype('question-type-' . $question->qtype);
 188  
 189  // Create the question editing form.
 190  if ($wizardnow !== '') {
 191      $mform = $qtypeobj->next_wizard_form('question.php', $question, $wizardnow, $formeditable);
 192  } else {
 193      $mform = $qtypeobj->create_editing_form('question.php', $question, $category, $contexts, $formeditable);
 194  }
 195  $toform = fullclone($question); // send the question object and a few more parameters to the form
 196  $toform->category = "{$category->id},{$category->contextid}";
 197  $toform->scrollpos = $scrollpos;
 198  if ($formeditable && $id){
 199      $toform->categorymoveto = $toform->category;
 200  }
 201  
 202  $toform->appendqnumstring = $appendqnumstring;
 203  $toform->returnurl = $originalreturnurl;
 204  $toform->makecopy = $makecopy;
 205  if ($cm !== null){
 206      $toform->cmid = $cm->id;
 207      $toform->courseid = $cm->course;
 208  } else {
 209      $toform->courseid = $COURSE->id;
 210  }
 211  
 212  $toform->inpopup = $inpopup;
 213  
 214  $mform->set_data($toform);
 215  
 216  if ($mform->is_cancelled()) {
 217      if ($inpopup) {
 218          close_window();
 219      } else {
 220          redirect($returnurl);
 221      }
 222  
 223  } else if ($fromform = $mform->get_data()) {
 224      // If we are saving as a copy, break the connection to the old question.
 225      if ($makecopy) {
 226          $question->id = 0;
 227          $question->hidden = 0; // Copies should not be hidden.
 228      }
 229  
 230      /// Process the combination of usecurrentcat, categorymoveto and category form
 231      /// fields, so the save_question method only has to consider $fromform->category
 232      if (!empty($fromform->usecurrentcat)) {
 233          // $fromform->category is the right category to save in.
 234      } else {
 235          if (!empty($fromform->categorymoveto)) {
 236              $fromform->category = $fromform->categorymoveto;
 237          } else {
 238              // $fromform->category is the right category to save in.
 239          }
 240      }
 241  
 242      /// If we are moving a question, check we have permission to move it from
 243      /// whence it came. (Where we are moving to is validated by the form.)
 244      list($newcatid, $newcontextid) = explode(',', $fromform->category);
 245      if (!empty($question->id) && $newcatid != $question->category) {
 246          $contextid = $newcontextid;
 247          question_require_capability_on($question, 'move');
 248      } else {
 249          $contextid = $category->contextid;
 250      }
 251  
 252      // Ensure we redirect back to the category the question is being saved into.
 253      $returnurl->param('category', $fromform->category);
 254  
 255      // We are acutally saving the question.
 256      if (!empty($question->id)) {
 257          question_require_capability_on($question, 'edit');
 258      } else {
 259          require_capability('moodle/question:add', context::instance_by_id($contextid));
 260          if (!empty($fromform->makecopy) && !$question->formoptions->cansaveasnew) {
 261              print_error('nopermissions', '', '', 'edit');
 262          }
 263      }
 264      $question = $qtypeobj->save_question($question, $fromform);
 265      if (isset($fromform->tags)) {
 266          core_tag_tag::set_item_tags('core_question', 'question', $question->id,
 267                  context::instance_by_id($contextid), $fromform->tags);
 268      }
 269  
 270      // Purge this question from the cache.
 271      question_bank::notify_question_edited($question->id);
 272  
 273      // If we are saving and continuing to edit the question.
 274      if (!empty($fromform->updatebutton)) {
 275          $url->param('id', $question->id);
 276          $url->remove_params('makecopy');
 277          redirect($url);
 278      }
 279  
 280      if ($qtypeobj->finished_edit_wizard($fromform)) {
 281          if ($inpopup) {
 282              echo $OUTPUT->notification(get_string('changessaved'), '');
 283              close_window(3);
 284          } else {
 285              $returnurl->param('lastchanged', $question->id);
 286              if ($appendqnumstring) {
 287                  $returnurl->param($appendqnumstring, $question->id);
 288                  $returnurl->param('sesskey', sesskey());
 289                  $returnurl->param('cmid', $cmid);
 290              }
 291              redirect($returnurl);
 292          }
 293  
 294      } else {
 295          $nexturlparams = array(
 296                  'returnurl' => $originalreturnurl,
 297                  'appendqnumstring' => $appendqnumstring,
 298                  'scrollpos' => $scrollpos);
 299          if (isset($fromform->nextpageparam) && is_array($fromform->nextpageparam)){
 300              //useful for passing data to the next page which is not saved in the database.
 301              $nexturlparams += $fromform->nextpageparam;
 302          }
 303          $nexturlparams['id'] = $question->id;
 304          $nexturlparams['wizardnow'] = $fromform->wizard;
 305          $nexturl = new moodle_url('/question/question.php', $nexturlparams);
 306          if ($cmid){
 307              $nexturl->param('cmid', $cmid);
 308          } else {
 309              $nexturl->param('courseid', $COURSE->id);
 310          }
 311          redirect($nexturl);
 312      }
 313  
 314  }
 315  
 316  $streditingquestion = $qtypeobj->get_heading();
 317  $PAGE->set_title($streditingquestion);
 318  $PAGE->set_heading($COURSE->fullname);
 319  $PAGE->navbar->add($streditingquestion);
 320  
 321  // Display a heading, question editing form and possibly some extra content needed for
 322  // for this question type.
 323  echo $OUTPUT->header();
 324  $qtypeobj->display_question_editing_page($mform, $question, $wizardnow);
 325  echo $OUTPUT->footer();