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[Aaron Wells <1482410@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

We had a report of a Mahara-generated Leap2a file that caused this crash
stack upon attempting to import it:

[WAR] 38 (import/leap/lib.php:126) simplexml_load_file(): /home/aaronw/dataroot/mahara/temp/import/admin-1438900425/extract/leap2a.xml:1808: parser error : PCDATA invalid Char value 11
Call stack (most recent first):

    log_message("simplexml_load_file(): /home/aaronw/dataroot/mahar...", 8, true, true, "/home/aaronw/www/mahara/htdocs/import/leap/lib.php", 126) at /home/aaronw/www/mahara/htdocs/lib/errors.php:441
    error(2, "simplexml_load_file(): /home/aaronw/dataroot/mahar...", "/home/aaronw/www/mahara/htdocs/import/leap/lib.php", 126, array(size 2)) at Unknown:0
    simplexml_load_file("/home/aaronw/dataroot/mahara/temp/import/admin-143...", "SimpleXMLElement", 67584) at /home/aaronw/www/mahara/htdocs/import/leap/lib.php:126
    PluginImportLeap->read_leap2a_xml_file() at /home/aaronw/www/mahara/htdocs/import/leap/lib.php:147
    PluginImportLeap->build_default_load_mapping() at /home/aaronw/www/mahara/htdocs/import/leap/lib.php:164
    PluginImportLeap->process(1) at /home/aaronw/www/mahara/htdocs/import/index.php:245
    import_submit(object(Pieform), array(size 3)) at Unknown:0
    call_user_func_array("import_submit", array(size 2)) at /home/aaronw/www/mahara/htdocs/lib/pieforms/pieform.php:537
    Pieform->__construct(array(size 6)) at /home/aaronw/www/mahara/htdocs/lib/pieforms/pieform.php:164
    Pieform::process(array(size 6)) at /home/aaronw/www/mahara/htdocs/lib/pieforms/pieform.php:71
    pieform(array(size 6)) at /home/aaronw/www/mahara/htdocs/import/index.php:171
    print_upload_form() at /home/aaronw/www/mahara/htdocs/import/index.php:61

Upon investigation it turned out that the leap2a XML file had a Vertical
Tab character (ASCII x0A) in one of the page titles. There is a whole
range of ASCII control characters that will cause a parser error in
SimpleXML, and if they're placed in a Mahara page title, they will be
included in the output of the Leap2a file, which will cause Mahara to
crash when it attempts to import the file.

** Affects: mahara
     Importance: Medium
     Assignee: Aaron Wells (u-aaronw)
         Status: In Progress


** Tags: leap2a xml

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https://bugs.launchpad.net/bugs/1482410

Title:
  Leap2A import problem: "simplexml_load_file()... parser error : PCDATA
  invalid Char value..."

Status in Mahara:
  In Progress

Bug description:
  We had a report of a Mahara-generated Leap2a file that caused this
  crash stack upon attempting to import it:

  [WAR] 38 (import/leap/lib.php:126) simplexml_load_file(): /home/aaronw/dataroot/mahara/temp/import/admin-1438900425/extract/leap2a.xml:1808: parser error : PCDATA invalid Char value 11
  Call stack (most recent first):

      log_message("simplexml_load_file(): /home/aaronw/dataroot/mahar...", 8, true, true, "/home/aaronw/www/mahara/htdocs/import/leap/lib.php", 126) at /home/aaronw/www/mahara/htdocs/lib/errors.php:441
      error(2, "simplexml_load_file(): /home/aaronw/dataroot/mahar...", "/home/aaronw/www/mahara/htdocs/import/leap/lib.php", 126, array(size 2)) at Unknown:0
      simplexml_load_file("/home/aaronw/dataroot/mahara/temp/import/admin-143...", "SimpleXMLElement", 67584) at /home/aaronw/www/mahara/htdocs/import/leap/lib.php:126
      PluginImportLeap->read_leap2a_xml_file() at /home/aaronw/www/mahara/htdocs/import/leap/lib.php:147
      PluginImportLeap->build_default_load_mapping() at /home/aaronw/www/mahara/htdocs/import/leap/lib.php:164
      PluginImportLeap->process(1) at /home/aaronw/www/mahara/htdocs/import/index.php:245
      import_submit(object(Pieform), array(size 3)) at Unknown:0
      call_user_func_array("import_submit", array(size 2)) at /home/aaronw/www/mahara/htdocs/lib/pieforms/pieform.php:537
      Pieform->__construct(array(size 6)) at /home/aaronw/www/mahara/htdocs/lib/pieforms/pieform.php:164
      Pieform::process(array(size 6)) at /home/aaronw/www/mahara/htdocs/lib/pieforms/pieform.php:71
      pieform(array(size 6)) at /home/aaronw/www/mahara/htdocs/import/index.php:171
      print_upload_form() at /home/aaronw/www/mahara/htdocs/import/index.php:61

  Upon investigation it turned out that the leap2a XML file had a
  Vertical Tab character (ASCII x0A) in one of the page titles. There is
  a whole range of ASCII control characters that will cause a parser
  error in SimpleXML, and if they're placed in a Mahara page title, they
  will be included in the output of the Leap2a file, which will cause
  Mahara to crash when it attempts to import the file.

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