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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
function scorm_add_time($a, $b) {
$aes = explode(':', $a);
$bes = explode(':', $b);
$aseconds = explode('.', $aes[2]);
$bseconds = explode('.', $bes[2]);
$change = 0;
$acents = 0; //Cents
if (count($aseconds) > 1) {
$acents = $aseconds[1];
}
$bcents = 0;
if (count($bseconds) > 1) {
$bcents = $bseconds[1];
}
$cents = $acents + $bcents;
$change = floor($cents / 100);
$cents = $cents - ($change * 100);
if (floor($cents) < 10) {
$cents = '0'. $cents;
}
$secs = $aseconds[0] + $bseconds[0] + $change; //Seconds
$change = floor($secs / 60);
$secs = $secs - ($change * 60);
if (floor($secs) < 10) {
$secs = '0'. $secs;
}
$mins = $aes[1] + $bes[1] + $change; //Minutes
$change = floor($mins / 60);
$mins = $mins - ($change * 60);
if ($mins < 10) {
$mins = '0' . $mins;
}
$hours = $aes[0] + $bes[0] + $change; //Hours
if ($hours < 10) {
$hours = '0' . $hours;
}
if ($cents != '0') {
return $hours . ":" . $mins . ":" . $secs . '.' . $cents;
} else {
return $hours . ":" . $mins . ":" . $secs;
}
}
/**
* Take the header row of an AICC definition file
* and returns sequence of columns and a pointer to
* the sco identifier column.
*
* @param string $row AICC header row
* @param string $mastername AICC sco identifier column
* @return mixed
*/
function scorm_get_aicc_columns($row, $mastername='system_id') {
$tok = strtok(strtolower($row), "\",\n\r");
$result = new stdClass();
$result->columns = array();
$i=0;
while ($tok) {
if ($tok !='') {
$result->columns[] = $tok;
if ($tok == $mastername) {
$result->mastercol = $i;
}
$i++;
}
$tok = strtok("\",\n\r");
}
return $result;
}
/**
* Given a colums array return a string containing the regular
* expression to match the columns in a text row.
*
* @param array $column The header columns
* @param string $remodule The regular expression module for a single column
* @return string
*/
function scorm_forge_cols_regexp($columns, $remodule='(".*")?,') {
$regexp = '/^';
foreach ($columns as $column) {
$regexp .= $remodule;
}
$regexp = substr($regexp, 0, -1) . '/';
return $regexp;
}
function scorm_parse_aicc($scorm) {
global $DB;
if ($scorm->scormtype == SCORM_TYPE_AICCURL) {
return scorm_aicc_generate_simple_sco($scorm);
}
if (!isset($scorm->cmid)) {
$cm = get_coursemodule_from_instance('scorm', $scorm->id);
$scorm->cmid = $cm->id;
}
$context = get_context_instance(CONTEXT_MODULE, $scorm->cmid);
$fs = get_file_storage();
$files = $fs->get_area_files($context->id, 'mod_scorm', 'content', 0, '', false);
$version = 'AICC';
$ids = array();
$courses = array();
$extaiccfiles = array('crs', 'des', 'au', 'cst', 'ort', 'pre', 'cmp');
foreach ($files as $file) {
$filename = $file->get_filename();
$ext = substr($filename, strrpos($filename, '.'));
$extension = strtolower(substr($ext, 1));
if (in_array($extension, $extaiccfiles)) {
$id = strtolower(basename($filename, $ext));
$ids[$id]->$extension = $file;
}
}
foreach ($ids as $courseid => $id) {
if (isset($id->crs)) {
$contents = $id->crs->get_content();
$rows = explode("\r\n", $contents);
if (is_array($rows)) {
foreach ($rows as $row) {
if (preg_match("/^(.+)=(.+)$/", $row, $matches)) {
switch (strtolower(trim($matches[1]))) {
case 'course_id':
$courses[$courseid]->id = trim($matches[2]);
break;
case 'course_title':
$courses[$courseid]->title = trim($matches[2]);
break;
case 'version':
$courses[$courseid]->version = 'AICC_'.trim($matches[2]);
break;
}
}
}
}
}
if (isset($id->des)) {
$contents = $id->des->get_content();
$rows = explode("\r\n", $contents);
$columns = scorm_get_aicc_columns($rows[0]);
$regexp = scorm_forge_cols_regexp($columns->columns);
for ($i=1; $i<count($rows); $i++) {
if (preg_match($regexp, $rows[$i], $matches)) {
for ($j=0; $j<count($columns->columns); $j++) {
$column = $columns->columns[$j];
$courses[$courseid]->elements[substr(trim($matches[$columns->mastercol+1]), 1 , -1)]->$column = substr(trim($matches[$j+1]), 1, -1);
}
}
}
}
if (isset($id->au)) {
$contents = $id->au->get_content();
$rows = explode("\r\n", $contents);
$columns = scorm_get_aicc_columns($rows[0]);
$regexp = scorm_forge_cols_regexp($columns->columns);
for ($i=1; $i<count($rows); $i++) {
if (preg_match($regexp, $rows[$i], $matches)) {
for ($j=0; $j<count($columns->columns); $j++) {
$column = $columns->columns[$j];
$courses[$courseid]->elements[substr(trim($matches[$columns->mastercol+1]), 1, -1)]->$column = substr(trim($matches[$j+1]), 1, -1);
}
}
}
}
if (isset($id->cst)) {
$contents = $id->cst->get_content();
$rows = explode("\r\n", $contents);
$columns = scorm_get_aicc_columns($rows[0], 'block');
$regexp = scorm_forge_cols_regexp($columns->columns, '(.+)?,');
for ($i=1; $i<count($rows); $i++) {
if (preg_match($regexp, $rows[$i], $matches)) {
for ($j=0; $j<count($columns->columns); $j++) {
if ($j != $columns->mastercol) {
$element = substr(trim($matches[$j+1]), 1 , -1);
if (!empty($element)) {
$courses[$courseid]->elements[$element]->parent = substr(trim($matches[$columns->mastercol+1]), 1, -1);
}
}
}
}
}
}
if (isset($id->ort)) {
$contents = $id->ort->get_content();
$rows = explode("\r\n", $contents);
$columns = scorm_get_aicc_columns($rows[0], 'course_element');
$regexp = scorm_forge_cols_regexp($columns->columns, '(.+)?,');
for ($i=1; $i<count($rows); $i++) {
if (preg_match($regexp, $rows[$i], $matches)) {
for ($j=0; $j<count($matches)-1; $j++) {
if ($j != $columns->mastercol) {
$courses[$courseid]->elements[substr(trim($matches[$j+1]), 1, -1)]->parent = substr(trim($matches[$columns->mastercol+1]), 1, -1);
}
}
}
}
}
if (isset($id->pre)) {
$contents = $id->pre->get_content();
$rows = explode("\r\n", $contents);
$columns = scorm_get_aicc_columns($rows[0], 'structure_element');
$regexp = scorm_forge_cols_regexp($columns->columns, '(.+),');
for ($i=1; $i<count($rows); $i++) {
if (preg_match($regexp, $rows[$i], $matches)) {
$courses[$courseid]->elements[$columns->mastercol+1]->prerequisites = substr(trim($matches[1-$columns->mastercol+1]), 1, -1);
}
}
}
if (isset($id->cmp)) {
$contents = $id->cmp->get_content();
$rows = explode("\r\n", $contents);
}
}
$oldscoes = $DB->get_records('scorm_scoes', array('scorm'=>$scorm->id));
$launch = 0;
if (isset($courses)) {
foreach ($courses as $course) {
$sco = new stdClass();
$sco->identifier = $course->id;
$sco->scorm = $scorm->id;
$sco->organization = '';
$sco->title = $course->title;
$sco->parent = '/';
$sco->launch = '';
$sco->scormtype = '';
if ($ss = $DB->get_record('scorm_scoes', array('scorm'=>$scorm->id,
'identifier'=>$sco->identifier))) {
$id = $ss->id;
$sco->id = $id;
$DB->update_record('scorm_scoes',$sco);
unset($oldscoes[$id]);
} else {
$id = $DB->insert_record('scorm_scoes', $sco);
}
if ($launch == 0) {
$launch = $id;
}
if (isset($course->elements)) {
foreach ($course->elements as $element) {
unset($sco);
$sco->identifier = $element->system_id;
$sco->scorm = $scorm->id;
$sco->organization = $course->id;
$sco->title = $element->title;
if (!isset($element->parent) || strtolower($element->parent) == 'root') {
$sco->parent = '/';
} else {
$sco->parent = $element->parent;
}
$sco->launch = '';
$sco->scormtype = '';
$sco->previous = 0;
$sco->next = 0;
$id = null;
// Is it an Assignable Unit (AU)?
if (isset($element->file_name)) {
$sco->launch = $element->file_name;
$sco->scormtype = 'sco';
}
if ($oldscoid = scorm_array_search('identifier', $sco->identifier, $oldscoes)) {
$sco->id = $oldscoid;
$DB->update_record('scorm_scoes', $sco);
$id = $oldscoid;
$DB->delete_records('scorm_scoes_data', array('scoid'=>$oldscoid));
unset($oldscoes[$oldscoid]);
} else {
$id = $DB->insert_record('scorm_scoes', $sco);
}
if (!empty($id)) {
$scodata = new stdClass();
$scodata->scoid = $id;
if (isset($element->web_launch)) {
$scodata->name = 'parameters';
$scodata->value = $element->web_launch;
$dataid = $DB->insert_record('scorm_scoes_data', $scodata);
}
if (isset($element->prerequisites)) {
$scodata->name = 'prerequisites';
$scodata->value = $element->prerequisites;
$dataid = $DB->insert_record('scorm_scoes_data', $scodata);
}
if (isset($element->max_time_allowed)) {
$scodata->name = 'max_time_allowed';
$scodata->value = $element->max_time_allowed;
$dataid = $DB->insert_record('scorm_scoes_data', $scodata);
}
if (isset($element->time_limit_action)) {
$scodata->name = 'time_limit_action';
$scodata->value = $element->time_limit_action;
$dataid = $DB->insert_record('scorm_scoes_data', $scodata);
}
if (isset($element->mastery_score)) {
$scodata->name = 'mastery_score';
$scodata->value = $element->mastery_score;
$dataid = $DB->insert_record('scorm_scoes_data', $scodata);
}
if (isset($element->core_vendor)) {
$scodata->name = 'datafromlms';
$scodata->value = preg_replace('/<cr>/i', "\r\n", $element->core_vendor);
$dataid = $DB->insert_record('scorm_scoes_data', $scodata);
}
}
if ($launch==0) {
$launch = $id;
}
}
}
}
}
if (!empty($oldscoes)) {
foreach ($oldscoes as $oldsco) {
$DB->delete_records('scorm_scoes', array('id'=>$oldsco->id));
$DB->delete_records('scorm_scoes_track', array('scoid'=>$oldsco->id));
}
}
$scorm->version = 'AICC';
$scorm->launch = $launch;
return true;
}
/**
* Given a scormid creates an AICC Session record to allow HACP
*
* @param int $scormid - id from scorm table
* @return string hacpsession
*/
function scorm_aicc_get_hacp_session($scormid) {
global $USER, $DB, $SESSION;
$cfg_scorm = get_config('scorm');
if (empty($cfg_scorm->allowaicchacp)) {
return false;
}
$now = time();
$hacpsession = $SESSION->scorm;
$hacpsession->scormid = $scormid;
$hacpsession->hacpsession = random_string(20);
$hacpsession->userid = $USER->id;
$hacpsession->timecreated = $now;
$hacpsession->timemodified = $now;
$DB->insert_record('scorm_aicc_session', $hacpsession);
return $hacpsession->hacpsession;
}
/**
* Check the hacp_session for whether it is valid.
*
* @param string $hacpsession The hacpsession value to check (optional). Normally leave this blank
* and this function will do required_param('sesskey', ...).
* @return mixed - false if invalid, otherwise returns record from scorm_aicc_session table.
*/
function scorm_aicc_confirm_hacp_session($hacpsession) {
global $DB;
$cfg_scorm = get_config('scorm');
if (empty($cfg_scorm->allowaicchacp)) {
return false;
}
$time = time()-($cfg_scorm->aicchacptimeout * 60);
$sql = "hacpsession = ? AND timemodified > ?";
$hacpsession = $DB->get_record_select('scorm_aicc_session', $sql, array($hacpsession, $time));
if (!empty($hacpsession)) { //update timemodified as this is still an active session - resets the timeout.
$hacpsession->timemodified = time();
$DB->update_record('scorm_aicc_session', $hacpsession);
}
return $hacpsession;
}
/**
* generate a simple single activity AICC object
* structure to wrap around and externally linked
* AICC package URL
*
* @param object $scorm package record
*/
function scorm_aicc_generate_simple_sco($scorm) {
global $DB;
// find the old one
$scos = $DB->get_records('scorm_scoes', array('scorm'=>$scorm->id));
if (!empty($scos)) {
$sco = array_shift($scos);
} else {
$sco = new object();
}
// get rid of old ones
foreach($scos as $oldsco) {
$DB->delete_records('scorm_scoes', array('id'=>$oldsco->id));
$DB->delete_records('scorm_scoes_track', array('scoid'=>$oldsco->id));
}
$sco->identifier = 'A1';
$sco->scorm = $scorm->id;
$sco->organization = '';
$sco->title = $scorm->name;
$sco->parent = '/';
// add the HACP signal to the activity launcher
if (preg_match('/\?/', $scorm->reference)) {
$sco->launch = $scorm->reference.'&CMI=HACP';
}
else {
$sco->launch = $scorm->reference.'?CMI=HACP';
}
$sco->scormtype = 'sco';
if (isset($sco->id)) {
$DB->update_record('scorm_scoes', $sco);
$id = $sco->id;
} else {
$id = $DB->insert_record('scorm_scoes', $sco);
}
return $id;
}
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