File Source for linker.php

<?php
/**
* Sloodle quiz linker (for Sloodle 0.3).
* Allows in-world objects to interact with Moodle quizzes.
* Part of the Sloodle project (www.sloodle.org).
*
* @package sloodle
* @copyright Copyright (c) 2006-8 Sloodle (various contributors)
* @license http://www.gnu.org/licenses/gpl-3.0.html GNU GPL v3
*
* @contributor (various Moodle authors)
* @contributor Edmund Edgar
* @contributor Peter R. Bloomfield
*/
// This script is expected to be requested by an in-world object.
// The following parameters are required:
//
// sloodlecontrollerid = ID of the controller through which to access Moodle
// sloodlepwd = password to authenticate the request
// sloodlemoduleid = the course module ID of the quiz to access
// sloodleuuid = UUID of the avatar making the request (optional if 'sloodleavname' is specified)
// sloodleavname = avatar name of the user making the request (optional if 'sloodleuuid' is specified)
//
//
//
// The following are the original quiz parameters:
//
// q = ID of the quiz course module instance
// id = ID of the course which this request relates to
// page = ?
// questionids = ?
// finishattempt = ?
// timeup = true if submission was by timer
// forcenew = teacher has requested a new preview
// action = ??
/** Lets Sloodle know we are in a linker script. */
define('SLOODLE_LINKER_SCRIPT', true);
/** Grab the Sloodle/Moodle configuration. */
require_once('../../sl_config.php');
/** Include the Sloodle PHP API. */
require_once(SLOODLE_LIBROOT.'/sloodle_session.php');
// We're using a copy of the locallib.php file from the quiz module itself.
// Linking directly to it seems to break - it would be better to find out why and see if there's a way we can reference it directly.
//2007101509 is the 1.9 release, which has a new locallib file
if ( $CFG->version >= 2007101500 ) {
require_once("locallib.1.9.php");
} else {
require_once("locallib.php");
}
// Authenticate the request and login the user
$sloodle = new SloodleSession();
$sloodle->authenticate_request();
$sloodle->validate_user();
$sloodle->user->login();
// Grab our additional parameters
$id = $sloodle->request->get_module_id();
$limittoquestion = optional_param('ltq', 0, PARAM_INT);
$output = array();
$courseid = optional_param('courseid', 0, PARAM_INT); // Course Module ID
//$id = optional_param('id', 0, PARAM_INT); // Course Module ID
$q = optional_param('q', 0, PARAM_INT); // or quiz ID
$page = optional_param('page', 0, PARAM_INT);
$questionids = optional_param('questionids', '');
$finishattempt = optional_param('finishattempt', 0, PARAM_BOOL);
$timeup = optional_param('timeup', 0, PARAM_BOOL); // True if form was submitted by timer.
$forcenew = optional_param('forcenew', false, PARAM_BOOL); // Teacher has requested new preview
$isnotify = ( optional_param( 'action', false, PARAM_RAW ) == 'notify' ) ;
// remember the current time as the time any responses were submitted
// (so as to make sure students don't get penalized for slow processing on this page)
$timestamp = time();
// We treat automatically closed attempts just like normally closed attempts
if ($timeup) {
$finishattempt = 1;
}
if ( ($courseid != 0) && ($id == 0) && ($q == 0) ) {
// fetch a quiz with the id for the course
if (! $mod = get_record("modules", "name", "quiz") ) {
$sloodle->response->quick_output(-712, 'MODULE_INSTANCE', 'Could not find quiz module', FALSE);
exit;
}
//if (! $coursemod = get_record("course_modules", "courseid", $courseid, "module", $mod->id)) {
if (! $coursemod = get_record("course_modules", "course", $courseid, "module", $mod->id)) {
$sloodle->response->quick_output(-712, 'MODULE_INSTANCE', 'Could not find course module instance', FALSE);
exit;
}
$id = $coursemod->id;
}
if ($id) {
if (! $cm = get_coursemodule_from_id('quiz', $id)) {
$sloodle->response->quick_output(-701, 'MODULE_INSTANCE', 'Identified module instance is not a quiz', FALSE);
exit();
}
if (! $course = get_record("course", "id", $cm->course)) {
$sloodle->response->quick_output(-701, 'MODULE_INSTANCE', 'Quiz module is misconfigured', FALSE);
exit();
}
if (! $quiz = get_record("quiz", "id", $cm->instance)) {
$sloodle->response->quick_output(-712, 'MODULE_INSTANCE', 'Part of quiz module instance is missing', FALSE);
exit();
}
} else {
if (! $quiz = get_record("quiz", "id", $q)) {
$sloodle->response->quick_output(-712, 'MODULE_INSTANCE', 'Could not find quiz module', FALSE);
exit();
}
if (! $course = get_record("course", "id", $quiz->course)) {
$sloodle->response->quick_output(-712, 'MODULE_INSTANCE', 'Part of quiz module instance is missing', FALSE);
exit();
}
if (! $cm = get_coursemodule_from_instance("quiz", $quiz->id, $course->id)) {
$sloodle->response->quick_output(-701, 'MODULE_INSTANCE', 'Unable to resolve course module instance', FALSE);
exit();
}
}
// Get number for the next or unfinished attempt
if(!$attemptnumber = (int)get_field_sql('SELECT MAX(attempt)+1 FROM ' .
"{$CFG->prefix}quiz_attempts WHERE quiz = '{$quiz->id}' AND " .
"userid = '{$USER->id}' AND timefinish > 0 AND preview != 1")) {
$attemptnumber = 1;
}
$strattemptnum = get_string('attempt', 'quiz', $attemptnumber);
$strquizzes = get_string("modulenameplural", "quiz");
// course id: $course->id
// course id: $course->id
// course name: $quiz->id
// attempts: $quiz->attempts
$output[] = array('course',$course->id,$course->fullname);
$numberofpreviousattempts = count_records_select('quiz_attempts', "quiz = '{$quiz->id}' AND " .
"userid = '{$USER->id}' AND timefinish > 0 AND preview != 1");
if ($quiz->attempts and $numberofpreviousattempts >= $quiz->attempts) {
$sloodle->response->quick_output(-701, 'QUIZ', 'You do not have any attempts left', FALSE);
exit();
}
/// Check subnet access
if ($quiz->subnet and !address_in_subnet(getremoteaddr(), $quiz->subnet)) {
$sloodle->response->quick_output(-1, 'MISC', 'A subnet error occurred', FALSE);
exit();
}
/// Check password access
if ($quiz->password) {
$sloodle->response->quick_output(-701, 'QUIZ', 'Quiz requires password - not supported by Sloodle', FALSE);
exit();
}
if ($quiz->delay1 or $quiz->delay2) {
//quiz enforced time delay
if ($attempts = quiz_get_user_attempts($quiz->id, $USER->id)) {
$numattempts = count($attempts);
} else {
$numattempts = 0;
}
$timenow = time();
$lastattempt_obj = get_record_select('quiz_attempts', "quiz = $quiz->id AND attempt = $numattempts AND userid = $USER->id", 'timefinish');
if ($lastattempt_obj) {
$lastattempt = $lastattempt_obj->timefinish;
}
if ($numattempts == 1 && $quiz->delay1) {
if ($timenow - $quiz->delay1 < $lastattempt) {
$sloodle->response->quick_output(-701, 'QUIZ', 'You need to wait until the time delay has expired.', FALSE);
exit();
}
} else if($numattempts > 1 && $quiz->delay2) {
if ($timenow - $quiz->delay2 < $lastattempt) {
$sloodle->response->quick_output(-701, 'QUIZ', 'You need to wait until the time delay has expired.', FALSE);
exit();
}
}
}
// sloodle_prim_render_output($output);
// exit;
/// Load attempt or create a new attempt if there is no unfinished one
$attempt = get_record('quiz_attempts', 'quiz', $quiz->id,
'userid', $USER->id, 'timefinish', 0);
$newattempt = false;
if (!$attempt) {
$newattempt = true;
// Start a new attempt and initialize the question sessions
$attempt = quiz_create_attempt($quiz, $attemptnumber);
// If this is an attempt by a teacher mark it as a preview
// Save the attempt
if (!$attempt->id = insert_record('quiz_attempts', $attempt)) {
$sloodle->response->quick_output(-701, 'QUIZ', 'Could not create new attempt.', FALSE);
exit();
}
// make log entries
add_to_log($course->id, 'quiz', 'attempt',
"review.php?attempt=$attempt->id",
"$quiz->id", $cm->id);
} else {
// log continuation of attempt only if some time has lapsed
if (($timestamp - $attempt->timemodified) > 600) { // 10 minutes have elapsed
add_to_log($course->id, 'quiz', 'continue attemp', // this action used to be called 'continue attempt' but the database field has only 15 characters
"review.php?attempt=$attempt->id",
"$quiz->id", $cm->id);
}
}
if (!$attempt->timestart) { // shouldn't really happen, just for robustness
$attempt->timestart = time();
}
/// Load all the questions and states needed by this script
// list of questions needed by page
$pagelist = quiz_questions_on_page($attempt->layout, $page);
if ($newattempt) {
$questionlist = quiz_questions_in_quiz($attempt->layout);
} else {
$questionlist = $pagelist;
}
// add all questions that are on the submitted form
if ($questionids) {
$questionlist .= ','.$questionids;
}
if (!$questionlist) {
$sloodle->response->quick_output(-701, 'QUIZ', 'No questions found.', FALSE);
exit();
}
$sql = "SELECT q.*, i.grade AS maxgrade, i.id AS instance".
" FROM {$CFG->prefix}question q,".
" {$CFG->prefix}quiz_question_instances i".
" WHERE i.quiz = '$quiz->id' AND q.id = i.question".
" AND q.id IN ($questionlist)";
// Load the questions
if (!$questions = get_records_sql($sql)) {
$sloodle->response->quick_output(-701, 'QUIZ', 'No questions found.', FALSE);
exit();
}
// Load the question type specific information
if (!get_question_options($questions)) {
$sloodle->response->quick_output(-701, 'QUIZ', 'Could not load question options.', FALSE);
exit();
}
// Restore the question sessions to their most recent states
// creating new sessions where required
if (!$states = get_question_states($questions, $quiz, $attempt)) {
$sloodle->response->quick_output(-701, 'QUIZ', 'Could not restore questions sessions.', FALSE);
exit();
}
// Save all the newly created states
if ($newattempt) {
foreach ($questions as $i => $question) {
save_question_session($questions[$i], $states[$i]);
}
}
// If the new attempt is to be based on a previous attempt copy responses over
if ($newattempt and $attempt->attempt > 1 and $quiz->attemptonlast and !$attempt->preview) {
// Find the previous attempt
if (!$lastattemptid = get_field('quiz_attempts', 'uniqueid', 'quiz', $attempt->quiz, 'userid', $attempt->userid, 'attempt', $attempt->attempt-1)) {
$sloodle->response->quick_output(-701, 'QUIZ', 'Could not find previous attempt to build on.', FALSE);
exit();
}
// For each question find the responses from the previous attempt and save them to the new session
foreach ($questions as $i => $question) {
// Load the last graded state for the question
$statefields = 'n.questionid as question, s.*, n.sumpenalty';
$sql = "SELECT $statefields".
" FROM {$CFG->prefix}question_states s,".
" {$CFG->prefix}question_sessions n".
" WHERE s.id = n.newgraded".
" AND n.attemptid = '$lastattemptid'".
" AND n.questionid = '$i'";
if (!$laststate = get_record_sql($sql)) {
// Only restore previous responses that have been graded
continue;
}
// Restore the state so that the responses will be restored
restore_question_state($questions[$i], $laststate);
// prepare the previous responses for new processing
$action = new stdClass;
$action->responses = $laststate->responses;
$action->timestamp = $laststate->timestamp;
$action->event = QUESTION_EVENTOPEN;
// Process these responses ...
question_process_responses($questions[$i], $states[$i], $action, $quiz, $attempt);
// Fix for Bug #5506: When each attempt is built on the last one,
// preserve the options from any previous attempt.
if ( isset($laststate->options) ) {
$states[$i]->options = $laststate->options;
}
// ... and save the new states
save_question_session($questions[$i], $states[$i]);
}
}
/// Process form data /////////////////////////////////////////////////
if ($isnotify) {
$responses = (object)$_GET; // GET version of data_submitted (see lib/weblib) used in original web version
// set the default event. This can be overruled by individual buttons.
$event = (array_key_exists('markall', $responses)) ? QUESTION_EVENTSUBMIT :
($finishattempt ? QUESTION_EVENTCLOSE : QUESTION_EVENTSAVE);
// Unset any variables we know are not responses
unset($responses->id);
unset($responses->q);
unset($responses->oldpage);
unset($responses->newpage);
unset($responses->review);
unset($responses->questionids);
unset($responses->saveattempt); // responses get saved anway
unset($responses->finishattempt); // same as $finishattempt
unset($responses->markall);
unset($responses->forcenewattempt);
// extract responses
// $actions is an array indexed by the questions ids
$actions = question_extract_responses($questions, $responses, $event);
// Process each question in turn
$questionidarray = explode(',', $questionids);
foreach($questionidarray as $i) {
if (!isset($actions[$i])) {
$actions[$i]->responses = array('' => '');
}
$actions[$i]->timestamp = $timestamp;
question_process_responses($questions[$i], $states[$i], $actions[$i], $quiz, $attempt);
save_question_session($questions[$i], $states[$i]);
}
$attempt->timemodified = $timestamp;
// We have now finished processing form data
}
/// Finish attempt if requested
if ($finishattempt) {
// Set the attempt to be finished
$attempt->timefinish = $timestamp;
// Find all the questions for this attempt for which the newest
// state is not also the newest graded state
if ($closequestions = get_records_select('question_sessions',
"attemptid = $attempt->uniqueid AND newest != newgraded", '', 'questionid, questionid')) {
// load all the questions
$closequestionlist = implode(',', array_keys($closequestions));
$sql = "SELECT q.*, i.grade AS maxgrade, i.id AS instance".
" FROM {$CFG->prefix}question q,".
" {$CFG->prefix}quiz_question_instances i".
" WHERE i.quiz = '$quiz->id' AND q.id = i.question".
" AND q.id IN ($closequestionlist)";
if (!$closequestions = get_records_sql($sql)) {
$sloodle->response->quick_output(-701, 'QUIZ', 'Questions missing.', FALSE);
exit();
}
// Load the question type specific information
if (!get_question_options($closequestions)) {
$sloodle->response->quick_output(-701, 'QUIZ', 'Could not load question options.', FALSE);
exit();
}
// Restore the question sessions
if (!$closestates = get_question_states($closequestions, $quiz, $attempt)) {
$sloodle->response->quick_output(-701, 'QUIZ', 'Could not restore question sessions.', FALSE);
exit();
}
foreach($closequestions as $key => $question) {
$action->event = QUESTION_EVENTCLOSE;
$action->responses = $closestates[$key]->responses;
$action->timestamp = $closestates[$key]->timestamp;
question_process_responses($question, $closestates[$key], $action, $quiz, $attempt);
save_question_session($question, $closestates[$key]);
}
}
add_to_log($course->id, 'quiz', 'close attempt',
"review.php?attempt=$attempt->id",
"$quiz->id", $cm->id);
}
/// Update the quiz attempt and the overall grade for the quiz
if ((isset($responses) && $responses) || $finishattempt) {
if (!update_record('quiz_attempts', $attempt)) {
$sloodle->response->quick_output(-701, 'QUIZ', 'Failed to save current quiz attempt.', FALSE);
exit();
}
if (($attempt->attempt > 1 || $attempt->timefinish > 0) and !$attempt->preview) {
quiz_save_best_grade($quiz);
}
}
/// Check access to quiz page
// check the quiz times
//TODO: Figure out what this does...
if ($timestamp < $quiz->timeopen || ($quiz->timeclose and $timestamp > $quiz->timeclose)) {
$sloodle->response->quick_output(-701, 'QUIZ', 'Quiz not available.', FALSE);
exit();
}
if ($finishattempt) {
// redirect('review.php?attempt='.$attempt->id);
$sloodle->response->quick_output(-701, 'QUIZ', 'Got to finishattempt - but do not yet have Sloodle code to handle it.', FALSE);
exit();
}
/// Print the quiz page ////////////////////////////////////////////////////////
if (!$isnotify) {
$pagequestions = explode(',', $pagelist);
$lastquestion = count($pagequestions);
// Make sure the question number is valid
if ($limittoquestion > $lastquestion || $limittoquestion < 0) {
$sloodle->response->quick_output(-701, 'QUIZ', "Question number $limittoquestion is invalid. Questions in quiz: $lastquestion.", FALSE);
exit();
}
$output[] = array('quiz',$quiz->attempts,$quiz->name,$quiz->timelimit,$quiz->id,$lastquestion);
$output[] = array('quizpages',quiz_number_of_pages($attempt->layout),$page,$pagelist);
// We will keep track of question numbers local to this quiz
$localqnum = 0;
/// Print all the questions
$number = quiz_first_questionnumber($attempt->layout, $pagelist);
foreach ($pagequestions as $i) {
$options = quiz_get_renderoptions($quiz->review, $states[$i]);
// Print the question
// var_dump($questions[$i]);
$q = $questions[$i];
$localqnum++;
if ( ($limittoquestion == 0) || ($limittoquestion == $localqnum) ) { //($limittoquestion == $q->id)
// Make sure the variables exist (avoids warnings!)
if (!isset($q->single)) $q->single = 0;
if (!isset($q->shuffleanswers)) $q->shuffleanswers = 0;
$output[] = array(
'question',
$localqnum, //$i, // The value in $i is equal to $q->id, rather than being sequential in the quiz
$q->id,
$q->parent,
strip_tags(stripslashes($q->questiontext)),
$q->defaultgrade,
$q->penalty,
$q->qtype,
$q->hidden,
$q->maxgrade,
$q->single,
$q->shuffleanswers,
0 //$deferred // This variable doesn't seem to be mentioned anywhere else in the file
);
$ops = $q->options;
foreach($ops as $opkey=>$op) {
if (!is_array($op)) continue; // Ignore this if there are no options (Prevents nasty PHP notices!)
foreach($op as $ok=>$ov) {
$output[] = array(
'questionoption',
$i,
$ov->id,
$ov->question,
strip_tags(stripslashes($ov->answer)),
$ov->fraction,
$ov->feedback
);
}
}
}
//print_question($questions[$i], $states[$i], $number, $quiz, $options);
save_question_session($questions[$i], $states[$i]);
$number += $questions[$i]->length;
}
$secondsleft = ($quiz->timeclose ? $quiz->timeclose : 999999999999) - time();
//if ($isteacher) {
// // For teachers ignore the quiz closing time
// $secondsleft = 999999999999;
//}
// If time limit is set include floating timer.
if ($quiz->timelimit > 0) {
$output[] = array('seconds left',$secondsleft);
}
}
$sloodle->response->set_status_code(1);
$sloodle->response->set_status_descriptor('QUIZ');
$sloodle->response->set_data($output);
sloodle_debug('<pre>');
$sloodle->response->render_to_output();
sloodle_debug('</pre>');
exit;
?>

Documentation generated on Mon, 16 Jun 2008 15:56:33 +0100 by phpDocumentor 1.4.0

Source for file linker.php