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Differences Between: [Versions 310 and 401] [Versions 401 and 402] [Versions 401 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   * Blackboard V5 and V6 question importer.
  19   *
  20   * @package    qformat_blackboard_six
  21   * @copyright  2005 Michael Penney
  22   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  23   */
  24  
  25  defined('MOODLE_INTERNAL') || die();
  26  
  27  require_once($CFG->libdir . '/xmlize.php');
  28  require_once($CFG->dirroot . '/question/format/blackboard_six/formatbase.php');
  29  require_once($CFG->dirroot . '/question/format/blackboard_six/formatqti.php');
  30  require_once($CFG->dirroot . '/question/format/blackboard_six/formatpool.php');
  31  
  32  /**
  33   * Class to represent a Blackboard file.
  34   *
  35   * @package    qformat_blackboard_six
  36   * @copyright  2005 Michael Penney
  37   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  38   */
  39  class qformat_blackboard_six_file {
  40      /** @var int type of file being imported, one of the constants FILETYPE_QTI or FILETYPE_POOL. */
  41      public $filetype;
  42      /** @var string the xml text */
  43      public $text;
  44      /** @var string path to path to root of image tree in unzipped archive. */
  45      public $filebase = '';
  46  }
  47  
  48  /**
  49   * Blackboard Six QTI file importer class.
  50   *
  51   * @package    qformat_blackboard_six
  52   * @copyright  2005 Michael Penney
  53   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  54   */
  55  class qformat_blackboard_six extends qformat_blackboard_six_base {
  56      /** @var int Blackboard assessment qti files were always imported by the blackboard_six plugin. */
  57      const FILETYPE_QTI = 1;
  58      /** @var int Blackboard question pool files were previously handled by the blackboard plugin. */
  59      const FILETYPE_POOL = 2;
  60  
  61      /**
  62       * Return the content of a file given by its path in the tempdir directory.
  63       *
  64       * @param string $path path to the file inside tempdir
  65       * @return mixed contents array or false on failure
  66       */
  67      public function get_filecontent($path) {
  68          $fullpath = $this->tempdir . '/' . clean_param($path, PARAM_PATH);
  69          if (is_file($fullpath) && is_readable($fullpath)) {
  70              return file_get_contents($fullpath);
  71          }
  72          return false;
  73      }
  74  
  75      /**
  76       * Return content of all files containing questions,
  77       * as an array one element for each file found,
  78       * For each file, the corresponding element is an array of lines.
  79       *
  80       * @param string $filename name of file
  81       * @return mixed contents array or false on failure
  82       */
  83      public function readdata($filename) {
  84          global $CFG;
  85  
  86          // Find if we are importing a .dat file.
  87          if (strtolower(pathinfo($filename, PATHINFO_EXTENSION)) == 'dat') {
  88              if (!is_readable($filename)) {
  89                  $this->error(get_string('filenotreadable', 'error'));
  90                  return false;
  91              }
  92  
  93              $fileobj = new qformat_blackboard_six_file();
  94  
  95              // As we are not importing a .zip file,
  96              // there is no imsmanifest, and it is not possible
  97              // to parse it to find the file type.
  98              // So we need to guess the file type by looking at the content.
  99              // For now we will do that searching for a required tag.
 100              // This is certainly not bullet-proof but works for all usual files.
 101              $fileobj->text = file_get_contents($filename);
 102              if (strpos($fileobj->text, '<questestinterop>')) {
 103                  $fileobj->filetype = self::FILETYPE_QTI;
 104              }
 105              if (strpos($fileobj->text, '<POOL>')) {
 106                  $fileobj->filetype = self::FILETYPE_POOL;
 107              }
 108              // In all other cases we are not able to handle this question file.
 109  
 110              // Readquestions is now expecting an array of strings.
 111              return array($fileobj);
 112          }
 113          // We are importing a zip file.
 114          // Create name for temporary directory.
 115          $uniquecode = time();
 116          $this->tempdir = make_temp_directory('bbquiz_import/' . $uniquecode);
 117          if (is_readable($filename)) {
 118              if (!copy($filename, $this->tempdir . '/bboard.zip')) {
 119                  $this->error(get_string('cannotcopybackup', 'question'));
 120                  fulldelete($this->tempdir);
 121                  return false;
 122              }
 123              $packer = get_file_packer('application/zip');
 124              if ($packer->extract_to_pathname($this->tempdir . '/bboard.zip', $this->tempdir)) {
 125                  $dom = new DomDocument();
 126  
 127                  if (!$dom->load($this->tempdir . '/imsmanifest.xml')) {
 128                      $this->error(get_string('errormanifest', 'qformat_blackboard_six'));
 129                      fulldelete($this->tempdir);
 130                      return false;
 131                  }
 132  
 133                  $xpath = new DOMXPath($dom);
 134  
 135                  // We starts from the root element.
 136                  $query = '//resources/resource';
 137                  $qfile = array();
 138  
 139                  $examfiles = $xpath->query($query);
 140                  foreach ($examfiles as $examfile) {
 141                      $fileobj = new qformat_blackboard_six_file();
 142  
 143                      if ($examfile->getAttribute('type') == 'assessment/x-bb-qti-test'
 144                              || $examfile->getAttribute('type') == 'assessment/x-bb-qti-pool') {
 145  
 146                          if ($content = $this->get_filecontent($examfile->getAttribute('bb:file'))) {
 147                              $fileobj->filetype = self::FILETYPE_QTI;
 148                              $fileobj->filebase = $this->tempdir;
 149                              $fileobj->text = $content;
 150                              $qfile[] = $fileobj;
 151                          }
 152                      }
 153                      if ($examfile->getAttribute('type') == 'assessment/x-bb-pool') {
 154                          if ($examfile->getAttribute('baseurl')) {
 155                              $fileobj->filebase = $this->tempdir. '/' . clean_param($examfile->getAttribute('baseurl'), PARAM_PATH);
 156                          }
 157                          if ($content = $this->get_filecontent($examfile->getAttribute('file'))) {
 158                              $fileobj->filetype = self::FILETYPE_POOL;
 159                              $fileobj->text = $content;
 160                              $qfile[] = $fileobj;
 161                          }
 162                      }
 163                  }
 164  
 165                  if ($qfile) {
 166                      return $qfile;
 167                  } else {
 168                      $this->error(get_string('cannotfindquestionfile', 'question'));
 169                      fulldelete($this->tempdir);
 170                  }
 171              } else {
 172                  $this->error(get_string('cannotunzip', 'question'));
 173                  fulldelete($this->temp_dir);
 174              }
 175          } else {
 176              $this->error(get_string('cannotreaduploadfile', 'error'));
 177              fulldelete($this->tempdir);
 178          }
 179          return false;
 180      }
 181  
 182      /**
 183       * Parse the array of objects into an array of questions.
 184       * Each object is the content of a .dat questions file.
 185       * This *could* burn memory - but it won't happen that much
 186       * so fingers crossed!
 187       *
 188       * @param array $lines array of qformat_blackboard_six_file objects for each input file.
 189       * @return array (of objects) question objects.
 190       */
 191      public function readquestions($lines) {
 192  
 193          // Set up array to hold all our questions.
 194          $questions = array();
 195  
 196          // Each element of $lines is a qformat_blackboard_six_file object.
 197          foreach ($lines as $fileobj) {
 198              if ($fileobj->filetype == self::FILETYPE_QTI) {
 199                  $importer = new qformat_blackboard_six_qti();
 200              } else if ($fileobj->filetype == self::FILETYPE_POOL) {
 201                  $importer = new qformat_blackboard_six_pool();
 202              } else {
 203                  // In all other cases we are not able to import the file.
 204                  debugging('fileobj type not recognised', DEBUG_DEVELOPER);
 205                  continue;
 206              }
 207              $importer->set_filebase($fileobj->filebase);
 208              $questions = array_merge($questions, $importer->readquestions($fileobj->text));
 209          }
 210  
 211          // Give any unnamed categories generated names.
 212          $unnamedcount = 0;
 213          foreach ($questions as $question) {
 214              if ($question->qtype == 'category' && $question->category == '') {
 215                  $question->category = get_string('importedcategory', 'qformat_blackboard_six', ++$unnamedcount);
 216              }
 217          }
 218  
 219          return $questions;
 220      }
 221  }