backup/bb/restore_bb.php

   1 <?php // $Id$
   2 // This file facilitates the conversion of a Blackboard course export
   3 // into a Moodle course export.  It assumes an unzipped directory and makes in-place alterations.
   4
   5 defined('MOODLE_INTERNAL') or die('Direct access to this script is forbidden.');
   6
   7 // Ziba Scott <ziba@linuxbox.com> 10-25-04
   8 require_once($CFG->dirroot.'/backup/bb/xsl_emulate_xslt.inc');
   9
  10 function get_subdirs($directory){
  11     $opendirectory = opendir( $directory );
  12     while($filename = readdir($opendirectory)) {
  13         if (is_dir($directory.$filename) and $filename != ".." and $filename != "."){
  14             $subdirs[] = $filename;
  15         }
  16     }
  17     closedir($opendirectory);
  18     return $subdirs;
  19 }
  20
  21
  22 function choose_bb_xsl($manifest){
  23     $f = fopen($manifest,"r");
  24     $buffer = fgets($f, 400);
  25     $buffer = fgets($f, 400);
  26     fclose($f);
  27     if (strstr($buffer,"xmlns:bb=\"http://www.blackboard.com/content-packaging/\"")){
  28         return "bb6_to_moodle.xsl";
  29     }
  30     return "bb5.5_to_moodle.xsl";
  31 }
  32
  33
  34 function blackboard_convert($dir){
  35     global $CFG;
  36
  37
  38     // Check for a Blackboard manifest file
  39     if (is_readable($dir.'/imsmanifest.xml') && !is_readable($dir.'/moodle.xml')){
  40
  41         if (!function_exists('xslt_create')) {  // XSLT MUST be installed for this to work
  42             notify('You need the XSLT library installed in PHP to open this Blackboard file');
  43             return false;
  44         }
  45
  46         //Select the proper XSL file
  47         $xslt_file = choose_bb_xsl($dir.'/imsmanifest.xml');
  48
  49
  50         //TODO: Use the get_string function for this
  51         echo "<li>Converting Blackboard export</li>";
  52
  53         // The XSL file must be in the same directory as the Blackboard files when it is processed
  54         if (!copy($CFG->dirroot."/backup/bb/$xslt_file", "$dir/$xslt_file")) {
  55             notify('Could not copy the XSLT file to '."$dir/$xslt_file");
  56             return false;
  57         }
  58
  59         // Change to that directory
  60         $startdir = getcwd();
  61         chdir($dir);
  62
  63
  64         // Process the Blackboard XML files with the chosen XSL file.
  65         // The imsmanifest contains all the XML files and their relationships.
  66         // The XSL processor will open them as needed.
  67         $xsltproc = xslt_create();
  68         if (!xslt_process($xsltproc, 'imsmanifest.xml', "$dir/$xslt_file", "$dir/moodle.xml")) {
  69             notify('Failed writing xml file');
  70             chdir($startdir);
  71             return false;
  72         }
  73
  74
  75         // Copy the Blackboard course files into the moodle course_files structure
  76         $subdirs = get_subdirs($dir."/");
  77         mkdir("$dir/course_files");
  78         foreach ($subdirs as $subdir){
  79             rename($subdir, "course_files/$subdir");
  80         }
  81
  82         chdir($startdir);
  83
  84         // Blackboard export successfully converted
  85         return true;
  86     }
  87     // This is not a Blackboard export
  88     return true;
  89
  90 }
  91
  92 ?>