iassign/ilm_handlers/java.php

<?php

/**
 * Class that implements ilm_handle, in order to allow manipulation and management of Java iLM
 * 
 * @author Igor Moreira Fe'lix
 * @author Patricia Alves Rodrigues
 * @author Leo^nidas de Oliveira Branda~o
 * @version v 1 2017/17/10
 * @package mod_iassign_ilm_handlers
 * @copyright iMatica (<a href="http://www.matematica.br">iMath</a>) - Computer Science Dep. of IME-USP (Brazil)
 * 
 * <b>License</b> 
 *  - http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

global $CFG;

require_once $CFG->dirroot . '/mod/iassign/ilm_handle.php';

class java implements ilm_handle {

  /// Build HTML code to present an applet
  public static function build_ilm_tags ($ilm_id, $options = array()) {
    global $DB, $OUTPUT;
    global $CONF_WWW; //TODO 1 => use iLM under WWW; otherwise use under MoodleData

    $html = "";

    if (empty($options['Proposition']))
      $options['Proposition'] = "";
    if (empty($options['addresPOST']))
      $options['addresPOST'] = "";
    if (empty($options['student_answer']))
      $options['student_answer'] = "";
    if (empty($options['notSEND']))
      $options['notSEND'] = "";
    else // Case it is authoring put 'notSEND' (important to iVProgH5 to present authoring tool)
    if ($options['type'] == "editor_update")
      $options['notSEND'] = "true";
    if (empty($options['id_iLM_security'])) // if defined, it is from 'iassign_security'
      $options['id_iLM_security'] = "";
    $id_iLM_security = $options['id_iLM_security'];

    $iassign_ilm = $DB->get_record('iassign_ilm', array('id' => $ilm_id));

    if ($iassign_ilm) {

      // md_files : filename
      $ilm_extension = $iassign_ilm->extension; // use local variavel to efficiency (several use)
      if ($ilm_extension) { // avoid problems
        $ilm_extension = strtolower($ilm_extension);
        }

      // Attention: in iAssign 2014 on, all the iLM is located on the Moodle filesystem (usually /var/moodledata/filedir/).
      // This means that '$iassign_ilm->file_jar' = '*_files.id'

      /*$file_url = array();
      $fs = get_file_storage();
      $files_jar = explode(",", $iassign_ilm->file_jar);

      foreach ($files_jar as $one_file) {
        $file = $fs->get_file_by_id($one_file);
        if (!$file)
          print $OUTPUT->notification(get_string('error_confirms_jar', 'iassign'), 'notifyproblem');
        else {
          // Get file path (informatin on Moodle table '*_files' - in its field 'contenthash'
          // The actual file is under the Moodle data. E.g., if Moodle data is the default '/var/moodledata' and 'contenthash="5641c1a0e1f5b37fa0b74996ead592c77ff027bc"',
          // then the JAR file in: '/var/moodledata/fildir/56/41/5641c1a0e1f5b37fa0b74996ead592c77ff027bc'
          $url = moodle_url::make_pluginfile_url($file->get_contextid(), $file->get_component(), $file->get_filearea(), $file->get_itemid(), $file->get_filepath(), $file->get_filename());
          array_push($file_url, $url);
          }
        }*/

      $lang = substr(current_language(), 0, 2);

      if ($options['type'] == "filter") { //leo
        $iassign_ilm_width = $options['width']; // or use? $iassign_ilm->width
        $iassign_ilm_height = $options['height']; // or use? $iassign_ilm->height
      } else { //leo
        $iassign_ilm_width = $iassign_ilm->width;
        $iassign_ilm_height = $iassign_ilm->height; // or use? $iassign_ilm->height
        }

      $file_url = explode(",", $iassign_ilm->file_jar);

      if (!empty($file_url)) { // There is an iLM file
        // Build tag to JAR file
        $html .= ' <!-- iAssign - view iLM content / LInE - http://line.ime.usp.br -->' . "\n";
        $html .= ' <applet id="iLM_applet" name="iLM" archive="' . new moodle_url("/mod/iassign/". implode(",", $file_url)) . '" code="' . $iassign_ilm->file_class . '" width="' . $iassign_ilm_width . '" height="' . $iassign_ilm_height . '" vspace=10 hspace=10>' . "\n";
        $html .= '  <param name="lang" value="' . $lang . '"/>' . "\n";

        switch ($options['type']) {
          case "view":
            $html .= ' <!-- view -->' . "\n";
            $html .= ' <param name="iLM_PARAM_SendAnswer" value="' . $options['notSEND'] . '"/>' . "\n"; // ATTENTION: MA_PARAM_notSEND=true => iLM_PARAM_SendAnswer=false
            $html .= ' <param name="MA_PARAM_notSEND" value="true"/>' . "\n"; // iLM version 1.0
            //MOOC 2016 --- allow to load dynamic parameters
            //TODO: REVIEW: this code is to insert iLM as HTML5 and to allow general parameter to any iLM
            //n $iassign_ilm_config = $DB->get_records('iassign_ilm_config', array('iassign_ilmid' => $ilm_id));
            //n foreach ($iassign_ilm_config as $ilm_config) {
            //n   if (array_key_exists($ilm_config->param_name, $options)) {
            //n     $ilm_config->param_value = $options[$ilm_config->param_name];
            //n     $html .= ' <param name="' . $ilm_config->param_name . '" value="' . $ilm_config->param_value . '"/>' . "\n";
            //n     }
            //n   }
            break;

          case "activity":
            $html .= ' <!-- activity -->' . "\n";
            $html .= ' <param name="iLM_PARAM_Assignment" value="' . $options['Proposition'] . '"/>' . "\n"; // iLM version 2.0
            $html .= ' <param name="iLM_PARAM_SendAnswer" value="' . $options['notSEND'] . '"/>' . "\n"; // ATTENTION: MA_PARAM_notSEND=true => iLM_PARAM_SendAnswer=false
            $html .= ' <param name="iLM_PARAM_ServerToGetAnswerURL" value="' . $options['addresPOST'] . '"/>' . "\n"; // not necessary in version iLM 2.0
            $html .= ' <param name="MA_PARAM_PropositionURL" value="true"/>' . "\n";
            $html .= ' <param name="MA_PARAM_Proposition" value="' . $options['Proposition'] . '"/>' . "\n"; // in iLM 2.0 is in 'iLM_PARAM_Assignment' already
            $html .= ' <param name="MA_PARAM_notSEND" value="' . $options['notSEND'] . '"/>' . "\n";
            $html .= ' <param name="MA_PARAM_addresPOST" value="' . $options['addresPOST'] . '"/>' . "\n"; // not necessary in version iLM 2.0
            if ($options['special_param'] == 1) {
              $html .= '<param name="TIPO_SCRIPT" value="1"/>' . "\n";
              $html .= '<param name="BOTAOSCR1" value="' . $options['student_answer'] . '" />' . "\n";
              }

            //MOOC 2016 --- allow to load dynamic parameters
            //n $iassign_activity_item_configs = $DB->get_records('iassign_statement_config', array('iassign_statementid' => $options['iassign_statement']));
            //n if ($iassign_activity_item_configs) {
            //n foreach ($iassign_activity_item_configs as $iassign_activity_item_config)
            //n   $html .= ' <param name="'.$iassign_activity_item_config->param_name.'" value="'.$iassign_activity_item_config->param_value.'"/>' . "\n";
            //n   }
            break;

          case "editor_new":
            $html .= ' <!-- editor_new -->' . "\n";

            $html .= ' <param name="iLM_PARAM_Assignment" value="' . $options['Proposition'] . '"/>' . "\n"; // iLM version 2.0
            $html .= ' <param name="iLM_PARAM_SendAnswer" value="' . $options['notSEND'] . '"/>' . "\n"; // ATTENTION: MA_PARAM_notSEND=true => iLM_PARAM_SendAnswer=false
            $html .= ' <param name="iLM_PARAM_Authoring" value="true"/>' . "\n";

            $html .= ' <param name="MA_PARAM_PropositionURL" value="true"/>' . "\n"; // iLM version 1.0
            $html .= ' <param name="MA_PARAM_notSEND" value="' . $options['notSEND'] . '"/>' . "\n";
            $html .= ' <param name="MA_PARAM_ArchiveTeacher" value="true"/>' . "\n";
            break;

          case "editor_update":
            $html .= ' <!-- editor_update -->' . "\n";
            $html .= ' <param name="iLM_PARAM_Assignment" value="' . $options['Proposition'] . '"/>' . "\n"; // iLM version 2.0
            $html .= ' <param name="iLM_PARAM_Authoring" value="true"/>' . "\n";
            $html .= ' <param name="iLM_PARAM_SendAnswer" value="' . $options['notSEND'] . '"/>' . "\n"; // ATTENTION: MA_PARAM_notSEND=true => iLM_PARAM_SendAnswer=false

            $html .= ' <param name="MA_PARAM_PropositionURL" value="true"/>' . "\n"; // iLM version 1.0
            $html .= ' <param name="MA_PARAM_Proposition" value="' . $options['Proposition'] . '"/>' . "\n";
            $html .= ' <param name="MA_PARAM_ArchiveTeacher" value="true"/>' . "\n";
            $html .= ' <param name="MA_PARAM_notSEND" value="' . $options['notSEND'] . '"/>' . "\n";
            break;

          default:
            print_error('error_view_without_actiontype', 'iassign'); //
          }
        $html .= '</applet> <br/>' . "\n";
        } // if (!empty($file_url))
      } // if ($iassign_ilm)

      $verify_java = '
      <script>var hasJava= navigator.javaEnabled();
      if (!hasJava) {
        var tableRef = document.getElementById("outlinetable").getElementsByTagName("tbody")[0];
        var newRow   = tableRef.insertRow();
        var newCell  = newRow.insertCell(0);
        newCell.style.textAlign = "center";
        newCell.style.border = "2px solid red"; 
        newCell.style.background = "#ffe8e8";
        newCell.style.fontSize = "1.5em";
        var newText  = document.createTextNode("'.get_string('applet_blocked', 'iassign').'");
        newCell.appendChild(newText);
      }
      </script>'; // '
    return $verify_java . $html;
    }


  /// Presents an activity with its iLM
  public static function show_activity_in_ilm ($iassign_statement_activity_item, $student_answer, $enderecoPOST, $view_teacherfileversion) {
    global $USER, $CFG, $DB;

    $ilm = $DB->get_record('iassign_ilm', array('id' => $iassign_statement_activity_item->iassign_ilmid));

    // enderecoPOST: eliminei a tag '&write_solution=0' deixando para este 'view' completar, eventualmente com '&write_solution=1'!

    $special_param1 = $iassign_statement_activity_item->special_param1;

    $context = context_module::instance($USER->cm);

    //TODO Given an activity => find its correspondent file in Moodle data. Bad solution!
    //TODO Change the meaning of 'iassign_statement.file' from insertion order to the ID in table 'files'.
    //TODO This demands update to each 'iassign_statement', find its corresponding on in 'files', and update 'iassign_statement.file = files.id'
    if ($view_teacherfileversion) { // get the exercise in Moodle data (teacher file)
      $fileid = "";
      $fs = get_file_storage();
      $files = $fs->get_area_files($context->id, 'mod_iassign', 'exercise', $iassign_statement_activity_item->file); // iassign_statement_activity_item = table 'iassign_statement'
      if ($files) {
        foreach ($files as $value) {
          if ($value->get_filename() != '.')
            $fileid = $value->get_id();
          }
        }
      if (!$fileid) { // 'Something is wrong. Maybe your teacher withdrew this exercise file. Please, inform your teacher.';
        print iassign::warning_message_iassign('error_exercise_removed') . "<br/>\n"; // I couldn't find the file in table 'files'!
        }
      }

    $ilm_name = strtolower($ilm->name);
    $extension = iassign_utils::filename_extension($ilm_name);

    if ($ilm_name == "igeom") { // is iGeom exercise
      $is_igeom = true;
      if (isset($fileid))
        $content_or_id_from_ilm_security = $fileid; // $iassign_statement_activity_item->file;
      if ($special_param1 == 1 && !empty($student_answer) && (!$view_teacherfileversion)) { // is script
        $view_teacherfileversion = true; // here when student is doing/redoing his activity
        }
      elseif (!$view_teacherfileversion) { // Student seem his solution or teacher seem it (of one student)
        $content_or_id_from_ilm_security = $student_answer;
        }
      else //TODO 2021/02 $fileid is used?
        $content_or_id_from_ilm_security = $fileid; // $iassign_statement_activity_item->file;
      }
    else {
      if ($view_teacherfileversion) { // $view_teacherfileversion==1 => load the exercise ('activity') from the 'moodledata' (id in 'files')
        // $content_or_id_from_ilm_security = $this->context->id;
        $content_or_id_from_ilm_security = $fileid; // $iassign_statement_activity_item->file;
        }
      else { // $view_teacherfileversion==null => load the learner answer from the data base (iassign_submission)
        $content_or_id_from_ilm_security = $student_answer;
        }
      }

    $allow_submission = false; // There is permission to 'submission' button?
    if ($USER->iassignEdit == 1 && $student_answer) { // for now, only iVProg2 and iVProgH5 allows editions of exercise already sent
      $allow_submission = true; // yes!
      $write_solution = 1;
      $enderecoPOST .= "&write_solution=1"; // complement POST address indicating that the learner could send edited solution
      }

    // Security: this avoid the student get a second access to the file content (usually an exercise)
    // Data are registered in the table '*_iassign_security' bellow and is erased by function 'view()' above.
    // IMPORTANT: the '$end_file' will receive the iLM content URL using the security filter './mod/iassign/ilm_security.php'
    // the iLM must request the content using this URL. Data are registered in the table '*_iassign_security'.
    // Attention : using iVProgH5 there are lot of " and the use of slashes (as '\"') will imply in iVProgH5 do not read the file!
    // do not use: $id_iLM_security = $this->write_iLM_security($iassign_statement_activity_item->id, addslashes($content_or_id_from_ilm_security));
    //2017 $id_iLM_security = $this->write_iLM_security($iassign_statement_activity_item->id, $content_or_id_from_ilm_security); // insert in 'iassign_security'
    //2017 $this->remove_old_iLM_security_entries($USER->id, $iassign_statement_activity_item->id);  // additional security: erase eventually old entries
    require_once ($CFG->dirroot . '/mod/iassign/ilm_security.php');
    $timecreated = time();
    $token = md5($timecreated); // iassign_iLM_security->timecreated);

    // Try to get the student answer
    // In './ilm_security.php': write_iLM_security($userid, $timecreated, $iassign_statementid = -1, $content_or_id_from_ilm_security)
    $id_iLM_security = ilm_security::write_iLM_security($USER->id, $timecreated, $iassign_statement_activity_item->id, $content_or_id_from_ilm_security); // insert in 'iassign_security'

    // $iassign_iLM_security = $DB->get_record("iassign_security", array("id" => $id_iLM_security));

    $end_file = $CFG->wwwroot . '/mod/iassign/ilm_security.php?id=' . $id_iLM_security . '&token=' . $token . '&view=' . $view_teacherfileversion; // need full path...
    //TODO iLM_HTML5 :: Need to use '*_iassign_ilm.ilm_type' in { 'jar', 'html5' }
    //TODO iLM_HTML5 :: For now I use the particular case of
    //leo Ou usar: if ($extension == "html" || $extension == "ivph") // if iLM is HTML5 is inside a frame


    $iassign = "
  <script type='text/javascript'>
  //<![CDATA[
  function jsAnalyseAnswer () {
    var strAnswer = document.applets[0].getAnswer(); //leo estava comentado!
    var evaluationResult = document.applets[0].getEvaluation(); //leo estava comentado!
    var comment = document.formEnvio.submission_comment.value;
    if ((strAnswer==null || strAnswer=='' || strAnswer==-1) && (comment==null || comment=='')) { // undefined
    alert('" . get_string('activity_empty', 'iassign') . "');
    return false; // success
    }
    else {
    document.formEnvio.iLM_PARAM_ArchiveContent.value = strAnswer;
    document.formEnvio.iLM_PARAM_ActivityEvaluation.value = evaluationResult;
    document.formEnvio.submit();
    return true; // any error...
    }
    }
   //]]>
  </script>\n"; //



    $iassign .= "\n<center>\n<form name='formEnvio' id='formEnvio' method='post' action='$enderecoPOST' enctype='multipart/form-data'>\n";

    // Attention: The actual iLM content will be provided by the indirect access in './mod/iassign/ilm_security.php',
    // bellow only the 'token' to the content will be shown in URL (by security reason). The iLM must use this URL on
    // 'MA_PARAM_Proposition' to request the content.
    // Calls static function bellow: parameters are data to store in table '*_iassign_submission'
    //leo $iassign .= ilm_settings::build_ilm_tags($this->ilm->id, array(
    $iassign .= ilm_settings::build_ilm_tags($ilm->id, array(//leo para testar 'iassign_security'
          "type" => "activity",
          "notSEND" => "false",
          "addresPOST" => $enderecoPOST,
          "Proposition" => $end_file,
          "special_param" => $special_param1,
          "student_answer" => $student_answer,
          "id_iLM_security" => $id_iLM_security,
          "iassign_statement" => $iassign_statement_activity_item->id // MOOC 2016
    ));

    if (!isguestuser() && $iassign_statement_activity_item->type_iassign != 1 
        && ($ilm->editingbehavior == 1 || ($ilm->editingbehavior == 0 && !in_array($_GET['action'], array('viewsubmission', 'view'))))) {

      $iassign .= " <input type='hidden' name='iLM_PARAM_ArchiveContent' value=''>\n";
      $iassign .= " <input type='hidden' name='iLM_PARAM_ActivityEvaluation' value=''>\n";

      if (!has_capability('mod/iassign:evaluateiassign', $USER->context, $USER->id))
        $iassign .= " <p><textarea rows='2' cols='60' name='submission_comment'></textarea></p>\n";
      else
        $iassign .= " <input type='hidden' name='submission_comment'>\n";

      if ($allow_submission) { // it is not iGeom
        $iassign .= "<center>\n<!-- load button -->\n" .
            "  <input type=button value='" . get_string('submit_iassign', 'iassign') . "' onClick = 'javascript:window.jsAnalyseAnswer();' title='" .
            get_string('message_submit_iassign', 'iassign') . "'>\n" . "</center>\n";
        } else {
        // Works with 'javascript:window.jsAnalyseAnswer()' or simply 'jsAnalyseAnswer()'
        $iassign .= "<center>\n<!-- load button -->\n" .
            "  <input type=button value='" . get_string('submit_iassign', 'iassign') . "' onClick = 'javascript:window.jsAnalyseAnswer();' title='" .
            get_string('message_submit_iassign', 'iassign') . "'>\n" . "</center>\n";
        }
      } // if (!isguestuser() && $iassign_statement_activity_item->type_iassign != 1)
      elseif ($ilm->editingbehavior == 0) {
      
        $iassign .= "<center><br><a href=\"view.php?action=repeat&id=".$_GET['id']
              ."&iassign_current=".$_GET['iassign_current']."\">
                <input type='button' value='".get_string('repeat', 'iassign')."'></a></center>";
      }
    $iassign .= "</form></center>\n\n";
    return $iassign;
    }

  /**
   * Exibe os dados de um iLM
   */
  public static function view_ilm($ilmid, $from) {
    global $DB;

    $url = new moodle_url('/admin/settings.php', array('section' => 'modsettingiassign'));
    $iassign_ilm = $DB->get_record('iassign_ilm', array('id' => $ilmid));

    $str = "";
    $str .= '<table id="outlinetable" cellpadding="5" width="100%" >' . "\n";
    $str .= '<tr>';
    $str .= '<td colspan=3 align=right>';
    if ($from != 'admin') {
      $str .= '<input type=button value="' . get_string('return', 'iassign') . '"  onclick="javascript:window.location = \'' . $_SERVER['HTTP_REFERER'] . '\';">' . "\n";
      }
    $str .= '<input type=button value="' . get_string('close', 'iassign') . '"  onclick="javascript:window.close();">';
    $str .= '</td>' . "\n";
    $str .= '</tr>' . "\n";

    if ($iassign_ilm) {
      $iassign_statement_activity_item = $DB->get_records('iassign_statement', array("iassign_ilmid" => $iassign_ilm->id));
      if ($iassign_statement_activity_item) {
        $total = count($iassign_statement_activity_item);
        } else {
        $total = 0;
        }

      if ($from == 'admin') {
        $str .= '<tr><td colspan=2>' . "\n";
        $str .= '<table width="100%" class="generaltable boxaligncenter" >' . "\n";
        $str .= '<tr>' . "\n";
        $str .= '<td class=\'cell c0 actvity\' ><strong>' . get_string('activities', 'iassign') . ':</strong>&nbsp;' . $total . '</td>' . "\n";
        $str .= '<td><strong>' . get_string('url_ilm', 'iassign') . '</strong>&nbsp;<a href="' . $iassign_ilm->url . '">' . $iassign_ilm->url . '</a></td>' . "\n";
        $str .= '</tr>' . "\n";
        $str .= '<tr><td colspan=2><strong>' . get_string('description', 'iassign') . ':</strong>&nbsp;' . iassign_language::get_description_lang(current_language(), $iassign_ilm->description) . '</td></tr>' . "\n";
        $str .= '<tr><td width="50%"><strong>' . get_string('type_ilm', 'iassign') . ':</strong>&nbsp;' . $iassign_ilm->type . '&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<strong>' . get_string('extension', 'iassign') . ':</strong>&nbsp;' . $iassign_ilm->extension . '</td>' . "\n";
        $str .= '<td width="50%"><strong>' . get_string('width', 'iassign') . ':</strong>&nbsp;' . $iassign_ilm->width;
        $str .= '&nbsp;&nbsp;<strong>' . get_string('height', 'iassign') . ':</strong>&nbsp;' . $iassign_ilm->height . '</td></tr>' . "\n";
        $str .= '<tr><td><strong>' . get_string('file_jar', 'iassign') . ':</strong>&nbsp;' . basename($iassign_ilm->file_jar) . '</td>' . "\n";
        $str .= '<td ><strong>' . get_string('file_class', 'iassign') . ':</strong>&nbsp;' . $iassign_ilm->file_class . '</td></tr>' . "\n";
        if ($iassign_ilm->evaluate == 1) {
          $evaluate = get_string('yes', 'iassign');
          } else {
          $evaluate = get_string('no', 'iassign');
          }

        $str .= '<tr><td width="50%"><strong>' . get_string('evaluate', 'iassign') . ':</strong>&nbsp;' . $evaluate . '</td>' . "\n";
        if ($iassign_ilm->enable == 1) {
          $enable = get_string('yes', 'iassign');
          } else {
          $enable = get_string('no', 'iassign');
          }
        $str .= '<td width="50%"><strong>' . get_string('enable', 'iassign') . ':</strong>&nbsp;' . $enable . '</td></tr>' . "\n";
        $str .= '<tr>' . "\n";
        $str .= '<td width="50%"><strong>' . get_string('file_created', 'iassign') . ':</strong>&nbsp;' . userdate($iassign_ilm->timecreated) . '</td>' . "\n";
        $str .= '<td width="50%"><strong>' . get_string('file_modified', 'iassign') . ':</strong>&nbsp;' . userdate($iassign_ilm->timemodified) . '</td>' . "\n";
        $str .= '</tr>' . "\n";
        $user_ilm = $DB->get_record('user', array('id' => $iassign_ilm->author));
        if ($user_ilm) {
          $str .= '<tr>' . "\n";
          $str .= '<td colspan=2><strong>' . get_string('author', 'iassign') . ':</strong>&nbsp;' . $user_ilm->firstname . '&nbsp;' . $user_ilm->lastname . '</td>' . "\n";
          $str .= '</tr>' . "\n";
          }
        $str .= '</table>' . "\n";
        $str .= '</td></tr>' . "\n";
        }

      if (!empty($iassign_ilm->file_jar)) {
        //TODO: REVIEW: to be used for parameters of "applet" from DB
        $options = array("type" => "view"); //MOOC2014: start

        $str .= '<tr class=\'cell c0 actvity\'><td  colspan=3 align=center bgcolor="#F5F5F5">' . "\n";

        // Second parameter null since 'iassign_security' are not define yet
        $str .= ilm_settings::build_ilm_tags($iassign_ilm->id, $options);

        //TODO: REVIEW: missing code to manage parameters
        //MOOC2014: tem este codigo!
        } else {
        $str .= '<tr class=\'cell c0 actvity\'>' . "\n";
        $str .= '<td colspan=2 align=center>' . get_string('null_file', 'iassign') . '</td>' . "\n";
        $str .= '<td align=center><a href="' . $url . '</a></td>' . "\n";
        $str .= '</tr>' . "\n";
        }
      $str .= '</td></tr>' . "\n";
      }

    $str .= '</table>' . "\n";

    return $str;
    }

  /**
   * Copia ou gera uma nova versão do iLM
   */
  public static function copy_new_version_ilm($param, $files_extract) {
    global $DB, $CFG;

    $iassign_ilm = new stdClass();
    $iassign_ilm->name = $param->name;
    $iassign_ilm->version = $param->version;
    $iassign_ilm->file_jar = null;


    $file_jar = null;
    if (!is_null($files_extract)) {
      foreach ($files_extract as $key => $value) {
        if (strpos(strtolower($key), ".jar")) {
          $extract = new stdClass();
          $extract->file_jar = $key;
          $extract->name = $param->name;
          $extract->version = $param->version;

          echo $key;
          $file_jar = self::save_ilm_by_xml($extract, $files_extract)[0];
          echo $file_jar;
          break;
          }
        }
      }

    $description = json_decode($param->description_lang);
    $description->{$param->set_lang} = $param->description;

    $newentry = new stdClass();
    $newentry->name = $param->name;
    $newentry->version = $param->version;
    $newentry->type = "Java";
    $newentry->url = $param->url;
    $newentry->description = strip_tags(json_encode($description));
    $newentry->extension = strtolower($param->extension);

    if (!is_null($file_jar)) {
      $newentry->file_jar = $file_jar;
      }

    $newentry->file_class = $param->file_class;
    $newentry->width = $param->width;
    $newentry->height = $param->height;
    $newentry->enable = 0;
    $newentry->timemodified = $param->timemodified;
    $newentry->timecreated = $param->timecreated;
    $newentry->evaluate = $param->evaluate;
    $newentry->author = $param->author;
    $newentry->parent = $param->parent;

    $newentry->id = $DB->insert_record("iassign_ilm", $newentry);

    // log event --------------------------------------------------------------------------------------
    iassign_log::add_log('copy_iassign_ilm', 'name: ' . $param->name . ' ' . $param->version, 0, $newentry->id);
    // log event --------------------------------------------------------------------------------------
    }


  /// Export an iLM to a package of the iLM (with its descriptor XML)
  public static function export_ilm ($ilm_id) {
    global $DB, $CFG;

    $iassign_ilm = $DB->get_record('iassign_ilm', array('id' => $ilm_id));

    $iassign_ilm_configs = $DB->get_records('iassign_ilm_config', array('iassign_ilmid' => $ilm_id)); //MOOC 2016

    $files_jar = str_replace(basename($iassign_ilm->file_jar), "", $iassign_ilm->file_jar);

    $zip_filename = $CFG->dataroot . '/temp/ilm-' . iassign_utils::format_pathname($iassign_ilm->name . '-v' . $iassign_ilm->version) . '_' . date("Ymd-Hi") . '.ipz';
    $zip = new zip_archive();
    $zip->open($zip_filename);

    $rootdir = $CFG->dirroot . '/mod/iassign/' . $files_jar;

    $allfiles = self::list_directory($rootdir);
    $i = 0;

    $base_jar = "";

    foreach ($allfiles as $file) {
      $mini = basename(str_replace($CFG->dirroot . '/mod/iassign/ilm/', "", $file));

      if (!is_dir($file)) {
        $zip->add_file_from_pathname($mini, $file);
        $base_jar = $mini;
        }
      }

    $application_descriptor = '<?xml version="1.0" encoding="utf-8"?>' . "\n";
    $application_descriptor .= '<application xmlns="http://line.ime.usp.br/application/1.5">' . "\n";
    $application_descriptor .= '  <name>' . $iassign_ilm->name . '</name>' . "\n";
    $application_descriptor .= '  <url>' . $iassign_ilm->url . '</url>' . "\n";
    $application_descriptor .= '  <version>' . $iassign_ilm->version . '</version>' . "\n";
    $application_descriptor .= '  <type>' . $iassign_ilm->type . '</type>' . "\n";
    $application_descriptor .= '  <description>' . html_entity_decode(str_replace(array('<p>', '</p>'), array('', ''), $iassign_ilm->description)) . '</description>' . "\n";
    $application_descriptor .= '  <extension>' . $iassign_ilm->extension . '</extension>' . "\n";
    $application_descriptor .= '  <file_jar>' . $base_jar . '</file_jar>' . "\n";
    $application_descriptor .= '  <file_class>' . $iassign_ilm->file_class . '</file_class>' . "\n";
    $application_descriptor .= '  <width>' . $iassign_ilm->width . '</width>' . "\n";
    $application_descriptor .= '  <height>' . $iassign_ilm->height . '</height>' . "\n";
    $application_descriptor .= '  <evaluate>' . $iassign_ilm->evaluate . '</evaluate>' . "\n";

    if ($iassign_ilm_configs) { //MOOC 2016
      $application_descriptor .= '   <params>' . "\n";
      foreach ($iassign_ilm_configs as $iassign_ilm_config) {
        $application_descriptor .= '    <param>' . "\n";
        $application_descriptor .= '     <type>' . $iassign_ilm_config->param_type . '</type>' . "\n";
        $application_descriptor .= '     <name>' . $iassign_ilm_config->param_name . '</name>' . "\n";
        $application_descriptor .= '     <value>' . $iassign_ilm_config->param_value . '</value>' . "\n";
        $application_descriptor .= '     <description>' . htmlentities(str_replace("\n", "", $iassign_ilm_config->description)) . '</description>' . "\n";
        $application_descriptor .= '     <visible>' . $iassign_ilm_config->visible . '</visible>' . "\n";
        $application_descriptor .= '    </param>' . "\n";
        }
      $application_descriptor .= '   </params>' . "\n";
      } //MOOC 2016

    $application_descriptor .= '</application>' . "\n";
    $zip->add_file_from_string('ilm-application.xml', $application_descriptor);
    $zip->close();

    header("Pragma: public");
    header("Expires: 0");
    header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
    header("Cache-Control: private", false);
    header("Content-Type: application/zip");
    header("Content-Disposition: attachment; filename=\"" . basename($zip_filename) . "\";");
    header("Content-Transfer-Encoding: binary");
    header("Content-Length: " . @filesize($zip_filename));
    set_time_limit(0);
    @readfile("$zip_filename") || die("File not found.");
    unlink($zip_filename);
    exit;
    }

  public static function delete_ilm($ilm_id) {
    global $DB, $CFG, $OUTPUT;

    $iassign_ilm = $DB->get_record('iassign_ilm', array('id' => $ilm_id));

    // Prepare the path of directory to be removed
    $path_w = rtrim($iassign_ilm->file_jar, "/");
    $folder_to_remove = substr($path_w, 0, strrpos($path_w, '/') + 1);

    // Check if the iLM directory is writable
    if (!is_writable($iassign_ilm->file_jar)) {
      return null;
      }

    self::delete_dir($folder_to_remove);

    $ilm_folder = "ilm/" . $iassign_ilm->name . "/";
    $k = 0;

    // Verify if iLM parent directory is empty, if yes, remove it
    foreach(glob($ilm_folder . "*", GLOB_ONLYDIR) as $dir) {
      $k ++;
      break;
      }

    if ($k == 0) {
      self::delete_dir($ilm_folder);
      }

    $DB->delete_records("iassign_ilm", array('id' => $ilm_id));
    $DB->delete_records("iassign_ilm_config", array('iassign_ilmid' => $ilm_id)); //MOOC 2016
    // log event --------------------------------------------------------------------------------------
    iassign_log::add_log('delete_iassign_ilm', 'name: ' . $iassign_ilm->name . ' ' . $iassign_ilm->version, 0, $iassign_ilm->id);
    // log event --------------------------------------------------------------------------------------

    return $iassign_ilm->parent;
    }

  /*public static function delete_ilm($ilm_id) {
    global $DB, $CFG;

    $fs = get_file_storage();
    $contextsystem = context_system::instance();
    $iassign_ilm = $DB->get_record('iassign_ilm', array('id' => $ilm_id));

    $files_jar = explode(",", $iassign_ilm->file_jar);
    foreach ($files_jar as $file_jar) {
      $file = $fs->get_file_by_id($file_jar);
      if ($file)
        $fs->delete_area_files($contextsystem->id, 'mod_iassign', 'ilm', $file->get_itemid());
      }

    $DB->delete_records("iassign_ilm", array('id' => $ilm_id));
    $DB->delete_records("iassign_ilm_config", array('iassign_ilmid' => $ilm_id)); //MOOC 2016
    // log event --------------------------------------------------------------------------------------
    iassign_log::add_log('delete_iassign_ilm', 'name: ' . $iassign_ilm->name . ' ' . $iassign_ilm->version, 0, $iassign_ilm->id);
    // log event --------------------------------------------------------------------------------------

    return $iassign_ilm->parent;
    }*/


  /// Register data from an iLM after to updated it
  public static function edit_ilm ($param, $itemid, $files_extract, $contextuser) {
    global $DB, $CFG;

    $iassign_ilm = new stdClass();
    $iassign_ilm->name = $param->name;
    $iassign_ilm->version = $param->version;
    $iassign_ilm->file_jar = $param->file_jar;

    $file_jar = null;
    if (!is_null($files_extract)) {
      foreach ($files_extract as $key => $value) {
        if (strpos(strtolower($key), ".jar")) {
          $extract = new stdClass();
          $extract->file_jar = $key;
          $extract->name = $param->name;
          $extract->version = $param->version;

          echo $key;
          $file_jar = self::save_ilm_by_xml($extract, $files_extract)[0];
          echo $file_jar;
          break;
          }
        }
      }

    $description = json_decode($param->description_lang);
    $description->{$param->set_lang} = $param->description;

    $updentry = new stdClass();
    $updentry->id = $param->id;
    $updentry->version = $param->version;
    $updentry->url = $param->url;
    $updentry->description = strip_tags(json_encode($description));
    $updentry->extension = strtolower($param->extension);

    if (!is_null($file_jar)) {
      $updentry->file_jar = $file_jar;
      }

    $updentry->file_class = $param->file_class;
    $updentry->width = $param->width;
    $updentry->height = $param->height;
    $updentry->enable = $param->enable;
    $updentry->timemodified = $param->timemodified;
    $updentry->evaluate = $param->evaluate;

    $DB->update_record("iassign_ilm", $updentry);

    // log event --------------------------------------------------------------------------------------
    iassign_log::add_log('update_iassign_ilm', 'name: ' . $param->name . ' ' . $param->version, 0, $param->id);
    // log event --------------------------------------------------------------------------------------
    }

  /**
   * Realiza os procedimentos relacionados ao armazenamento dos dados do iLM e seus arquivos
   */
  public static function new_ilm($itemid, $files_extract, $application_xml, $contextuser, $fs) {

    global $DB, $CFG, $USER, $OUTPUT;

    $description_str = str_replace(array('<description>', '</description>'), array('', ''), $application_xml->description->asXML());

    $iassign_ilm = $DB->get_record('iassign_ilm', array("name" => (String) $application_xml->name, "version" => (String) $application_xml->version));
    if ($iassign_ilm) {
      foreach ($files_extract as $key => $value) {
        $file = $CFG->dataroot . '/temp/' . $key;
        if (file_exists($file))
          unlink($file);
        }

      print($OUTPUT->notification(get_string('error_import_ilm_version', 'iassign'), 'notifyproblem'));
      } else {
      $file_jar = self::save_ilm_by_xml($application_xml, $files_extract);

      if (empty($file_jar))
        print_error('error_add_ilm', 'iassign');
      else { // if (empty($file_jar))
        $iassign_ilm = $DB->get_record('iassign_ilm', array("parent" => 0, "name" => (String) $application_xml->name));
        if (!$iassign_ilm) {
          $iassign_ilm = new stdClass(); //MOOC 2016
          $iassign_ilm->id = 0;
          }

        $newentry = new stdClass();
        $newentry->name = (String) $application_xml->name;
        $newentry->version = (String) $application_xml->version;
        $newentry->type = (String) $application_xml->type;
        $newentry->url = (String) $application_xml->url;
        $newentry->description = strip_tags($description_str);
        $newentry->extension = strtolower((String) $application_xml->extension);

        $newentry->file_jar = $file_jar;

        $newentry->file_class = (String) $application_xml->file_class;
        $newentry->width = (String) $application_xml->width;
        $newentry->height = (String) $application_xml->height;
        $newentry->enable = 0;
        $newentry->timemodified = time();
        $newentry->author = $USER->id;
        $newentry->timecreated = time();
        $newentry->evaluate = (String) $application_xml->evaluate;
        $newentry->parent = $iassign_ilm->id;

        //MOOC 2016 $newentry->id = $DB->insert_record("iassign_ilm", $newentry);

        $newentry->id = $DB->insert_record("iassign_ilm", $newentry);

        // log event --------------------------------------------------------------------------------------
        iassign_log::add_log('add_iassign_ilm', 'name: ' . $application_xml->name . ' ' . $application_xml->version, 0, $newentry->id);
        // log event --------------------------------------------------------------------------------------
        if ($application_xml->params->param) {
          foreach ($application_xml->params->param as $value) {
            $newentry = new stdClass();
            $newentry->iassign_ilmid = $iassign_ilmid;
            $newentry->param_type = (String) $value->type;
            $newentry->param_name = (String) $value->name;
            $newentry->param_value = (String) $value->value;
            $newentry->description = html_entity_decode((String) $value->description);
            $newentry->visible = (String) $value->visible;

            $newentry->id = $DB->insert_record("iassign_ilm", $newentry);

            if (!$newentry->id) {
              print_error('error_add_param', 'iassign');
              }
            }
          }
        }
      }

    $fs->delete_area_files($contextuser->id, 'user', 'draft', $itemid);
    return true;
    }

  /**
   * Realiza os procedimentos relacionados ao armazenamento de um iLM por meio da importação
   */
  public static function import_ilm($itemid, $files_extract, $application_xml, $contextuser, $fs) {

    global $DB, $CFG, $USER, $OUTPUT;

    $description_str = str_replace(array('<description>', '</description>'), array('', ''), $application_xml->description->asXML());

    $iassign_ilm = $DB->get_record('iassign_ilm', array("name" => (String) $application_xml->name, "version" => (String) $application_xml->version));
    if ($iassign_ilm) {
      foreach ($files_extract as $key => $value) {
        $file = $CFG->dataroot . '/temp/' . $key;
        if (file_exists($file))
          unlink($file);
        }

      print($OUTPUT->notification(get_string('error_import_ilm_version', 'iassign'), 'notifyproblem'));
      } else {
      $file_jar = self::save_ilm_by_xml($application_xml, $files_extract);

      if (empty($file_jar))
        print_error('error_add_ilm', 'iassign');
      else { // if (empty($file_jar))
        $iassign_ilm = $DB->get_record('iassign_ilm', array("parent" => 0, "name" => (String) $application_xml->name));
        if (!$iassign_ilm) {
          $iassign_ilm = new stdClass(); //MOOC 2016
          $iassign_ilm->id = 0;
          }

        $newentry = new stdClass();
        $newentry->name = (String) $application_xml->name;
        $newentry->version = (String) $application_xml->version;
        $newentry->type = (String) $application_xml->type;
        $newentry->url = (String) $application_xml->url;
        $newentry->description = strip_tags($description_str);
        $newentry->extension = strtolower((String) $application_xml->extension);

        $newentry->file_jar = implode(",", $file_jar);

        $newentry->file_class = (String) $application_xml->file_class;
        $newentry->width = (String) $application_xml->width;
        $newentry->height = (String) $application_xml->height;
        $newentry->enable = 0;
        $newentry->timemodified = time();
        $newentry->author = $USER->id;
        $newentry->timecreated = time();
        $newentry->evaluate = (String) $application_xml->evaluate;
        $newentry->parent = $iassign_ilm->id;

        //MOOC 2016 $newentry->id = $DB->insert_record("iassign_ilm", $newentry);
        $iassign_ilmid = $DB->insert_record("iassign_ilm", $newentry);
        if ($application_xml->params->param) {
          foreach ($application_xml->params->param as $value) {
            $newentry = new stdClass();
            $newentry->iassign_ilmid = $iassign_ilmid;
            $newentry->param_type = (String) $value->type;
            $newentry->param_name = (String) $value->name;
            $newentry->param_value = (String) $value->value;
            $newentry->description = html_entity_decode((String) $value->description);
            $newentry->visible = (String) $value->visible;

            $newentry->id = $DB->insert_record("iassign_ilm", $newentry);

            if (!$newentry->id) {
              print_error('error_add_param', 'iassign');
              }
            }
          }
        }

      print($OUTPUT->notification(get_string('ok_import_ilm_version', 'iassign'), 'notifysuccess'));
      } // else if ($iassign_ilm)

    $fs->delete_area_files($contextuser->id, 'user', 'draft', $itemid);
    }

  /// Function for save iLM from XML descriptor
  //  @param array $application_xml Data of XML descriptor
  //  @param array $files_extract Filenames of extract files
  //  @return array Return an array content id of JAR files
  static function save_ilm_by_xml($application_xml, $files_extract) {

    global $CFG, $USER, $OUTPUT;

    // Check if the iLM directory is writable
    if (!is_writable("ilm/")) {
      print($OUTPUT->notification(get_string('error_folder_permission_denied', 'iassign'), 'notifyproblem'));
      return null;
      }

    // Check if iLM directory already exists
    if (!file_exists("ilm/" . $application_xml->name)) {
      // mkdir("ilm/" . $application_xml->name, 0777, true);
      mkdir("ilm/" . $application_xml->name, 0755, true); // permissions: drwxr-xr-x
      }

    // Check if iLM version already exists in directory
    if (!file_exists("ilm/" . $application_xml->name . "/" . $application_xml->version)) {
      // mkdir("ilm/" . $application_xml->name . "/" . $application_xml->version, 0777, true);
      mkdir("ilm/" . $application_xml->name . "/" . $application_xml->version, 0755, true); // drwxr-xr-x
      }
    else {
      print($OUTPUT->notification(get_string('error_import_ilm_version', 'iassign'), 'notifyproblem'));
      return null;
      }

    $root_ilm = "ilm/" . $application_xml->name . "/" . $application_xml->version;
    // Extract iLM files to directory
    foreach ($files_extract as $key => $value) {
      $file = $CFG->dataroot . '/temp/' . $key;

      if ($key == $application_xml->file_jar)
        copy($file, $root_ilm . "/" . $key);

      unlink($file);
      } // foreach ($files_extract as $key => $value)

    return $root_ilm . "/" . $application_xml->file_jar;
    }


  /// Function for list the directory where iLM is allocated.
  //  @param type $dir
  //  @return type
  static function list_directory ($dir) {
    $files = array();
    $cont = 0;
    $ffs = scandir($dir);
    unset($ffs[array_search('.', $ffs, true)]);
    unset($ffs[array_search('..', $ffs, true)]);
    if (count($ffs) < 1) {
      return;
      }
    foreach ($ffs as $ff) {
      $files[$cont] = $dir . "/" . $ff;
      $cont++;
      if (is_dir($dir . '/' . $ff)) {
        $temp = self::list_directory($dir . '/' . $ff);
        foreach ($temp as $t) {
            $files[$cont] = $t;
            $cont++;
          }
        }
      }
    return $files;
    }

  /// Function for delete directory where the iLM is allocated.
  //  @param string $dirPath
  //  @throws InvalidArgumentException
  public static function delete_dir ($dirPath) {
    if (substr($dirPath, strlen($dirPath) - 1, 1) != '/') {
      $dirPath .= '/';
      }
    $files = glob($dirPath . '*', GLOB_MARK);
    foreach ($files as $file) {
      if (is_dir($file)) {
        self::delete_dir($file);
      } else {
        unlink($file);
        }
      }
    rmdir($dirPath);
    }

  }

?>