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/* Preset Menu
*
* This is the page that is the menu item in the config database
* pages.
*/
require_once('../../config.php');
require_once('lib.php');
require_once($CFG->libdir.'/uploadlib.php');
require_once($CFG->libdir.'/xmlize.php');
$id = optional_param('id', 0, PARAM_INT); // course module id
$d = optional_param('d', 0, PARAM_INT); // database activity id
$action = optional_param('action', 'base', PARAM_RAW); // current action
$file = optional_param('file', false, PARAM_PATH); // path of file to upload
if ($id) {
if (! $cm = get_record('course_modules', 'id', $id)) {
error('Course Module ID Incorrect');
}
if (! $course = get_record('course', 'id', $cm->course)) {
error('Course is misconfigured');
}
if (! $data = get_record('data', 'id', $cm->instance)) {
error('Module Incorrect');
}
} else if ($d) {
if (! $data = get_record('data', 'id', $d)) {
error('Database ID Incorrect');
}
if (! $course = get_record('course', 'id', $data->course)) {
error('Course is misconfigured');
}
if (! $cm = get_coursemodule_from_instance('data', $data->id, $course->id)) {
error('Course Module ID was incorrect');
}
} else {
error('Parameter missing');
}
require_login($course->id);
require_capability('mod/data:managetemplates', get_context_instance(CONTEXT_MODULE, $cm->id));
/* get the list of standard presets found in /mod/data/preset */
$presets = array();
if ($presetdir = opendir($CFG->dirroot.'/mod/data/preset')) {
while ($userdir = readdir($presetdir)) {
$fulluserdir = '/mod/data/preset/'.$userdir;
if ($userdir == '.' || $userdir == '..') {
continue;
}
/* Global Standard Presets */
if (is_directory_a_preset($CFG->dirroot.$fulluserdir)) {
$preset = new StdClass;
$preset->path = $fulluserdir;
$preset->name = $userdir;
if (file_exists($fulluserdir.'/screenshot.jpg')) {
$preset->screenshot = $CFG->wwwroot.'/mod/data/preset/'.$userdir.'/screenshot.jpg';
}
$presets[] = $preset;
unset($preset);
}
/* User made presets stored in user folders */
else if (get_record('user', 'id', $userdir)) {
$userdirh = opendir($CFG->dirroot.$fulluserdir);
while ($userpresetdir = readdir($userdirh)) {
$fulluserpresetdir = $fulluserdir.'/'.$userpresetdir;
if ($userpresetdir != '.' && $userpresetdir != '..' && is_directory_a_preset($CFG->dirroot.$fulluserpresetdir)) {
$preset = new StdClass;
$preset->path = $fulluserpresetdir;
$preset->name = $userpresetdir;
$preset->user = $userdir;
if (file_exists($fulluserpresetdir.'/screenshot.jpg')) {
$preset->screenshot = $CFG->wwwroot.'/mod/data/preset/'.$userdir.'/'.$userpresetdir.'/screenshot.jpg';
}
$presets[] = $preset;
unset($preset);
}
}
}
}
closedir($presetdir);
}
/* Need sesskey security check here for import instruction */
$sesskey = sesskey();
/********************************************************************/
/* Output */
data_presets_print_header($course, $cm, $data);
echo "<center>";
switch ($action) {
/* Main selection menu - default mode also. */
default:
case 'base':
$strimport = get_string('import');
$strfromfile = get_string('fromfile', 'data');
$strchooseorupload = get_string('chooseorupload', 'data');
$strok = get_string('ok');
$strusestandard = get_string('usestandard', 'data');
$strchoose = get_string('choose');
$strexport = get_string('export', 'data');
$strexportaszip = get_string('exportaszip', 'data');
$strsaveaspreset = get_string('saveaspreset', 'data');
$strdelete = get_string('delete');
echo "<table cellpadding=7>";
echo "<tr><td><h3>$strimport</h3></td>";
echo "<td><form name='form' method='POST' action='?d=$data->id&action=importzip&sesskey=$sesskey' enctype='multipart/form-data'>";
helpbutton('importfromfile', '', 'data');
echo " $strfromfile:</td><td><input name=\"file\" size=\"20\" value=\"\" alt=\"file\" type=\"text\"><input name=\"coursefiles\" title=\"Choose or upload a file\" value=\"$strchooseorupload\" onclick=\"return openpopup('/files/index.php?id=2&choose=form.file', 'coursefiles', 'menubar=0,location=0,scrollbars,resizable,width=750,height=500', 0);\" type=\"button\">";
echo "<input type=\"submit\" value=\"$strok\"/>";
echo "</form></td></tr>";
echo "<tr valign=top><td></td><td>";
helpbutton('usepreset', '', 'data');
echo " $strusestandard: </td><td>";
echo "<table width=100%>";
foreach ($presets as $id => $preset) {
echo "<tr><form action='' method='POST'>";
echo "<input type='hidden' name='file' value=\"$preset->path\">";
echo "<input type='hidden' name='action' value='importpreset'>";
echo "<input type='hidden' name='d' value='$data->id'>";
echo "<input type='hidden' name='sesskey' value='$sesskey'>";
echo "<td>";
if ($preset->screenshot) {
echo "<img src='$preset->screenshot' alt='$preset->screenshot' />";
}
echo "</td><td>$preset->name";
if ($preset->user) {
$user = get_record('user', 'id', $preset->user);
echo " by $user->firstname $user->lastname";
}
echo "</td><td><input type='submit' value='$strchoose'></td></form>";
echo "<td>";
if ($preset->user == $USER->id || isadmin()) {
echo "<form action='' method='POST'>";
echo "<input type='hidden' name='d' value='$data->id' />";
echo "<input type='hidden' name='action' value='confirmdelete' />";
echo "<input type='hidden' name='sesskey' value='$sesskey' />";
echo "<input type='hidden' name='deleteid' value='$id' />";
echo "<input type='hidden' name='deletename' value=\"$preset->name\" />";
echo "<input type='submit' value='$strdelete' /></form>";
}
echo "</td></tr>";
}
echo "</table></td></tr>";
echo "<tr><td valign=top><h3>$strexport</h3></td>";
echo "<td><form action='' method='POST'>";
helpbutton('exportzip', '', 'data');
echo " <input type='hidden' name='action' value='export' />";
echo "<input type='hidden' name='d' value='$data->id' />";
echo "<input type='submit' value='$strexportaszip' />";
echo "</form>";
echo "<form action='' method='POST'>";
helpbutton('savepreset', '', 'data');
echo " <input type='hidden' name='action' value='save1' />";
echo "<input type='hidden' name='d' value='$data->id' />";
echo "<input type='hidden' name='sesskey' value='$sesskey' />";
echo "<input type='submit' value='$strsaveaspreset' />";
echo "</form>";
echo "</table>";
break;
/***************** Deleting *****************/
case 'confirmdelete' :
if (!confirm_sesskey()) {
error("Sesskey Invalid");
}
$deletename = required_param('deletename', PARAM_RAW);
$deleteid = required_param('deleteid', PARAM_INT);
$strwarning = get_string('deletewarning', 'data');
$strdelete = get_string('delete');
notify($strwarning);
echo "<form action='' method='POST'>";
echo "<input type='hidden' name='d' value='$data->id' />";
echo "<input type='hidden' name='action' value='delete' />";
echo "<input type='hidden' name='sesskey' value='$sesskey' />";
echo "<input type='hidden' name='deleteid' value='$deleteid' />";
echo "<input type='hidden' name='deletename' value=\"$deletename\" />";
echo "<input type='submit' value='$strdelete' /></form>";
break;
case 'delete' :
if (!confirm_sesskey()) {
error('Sesskey Invalid');
}
$deletename = required_param('deletename', PARAM_RAW);
$deleteid = required_param('deleteid', PARAM_INT);
if (!empty($presets[$deleteid])) {
if ($presets[$deleteid]->name == $deletename) {
if (!clean_preset($CFG->dirroot.$presets[$deleteid]->path)) error("Error deleting");
}
rmdir($CFG->dirroot.$presets[$deleteid]->path);
}
else {
error('Invalid delete');
}
$strdelete = get_string('deleted', 'data');
notify("$deletename $strdeleted");
break;
/***************** Importing *****************/
case 'importpreset' :
if (!confirm_sesskey()) {
error("Sesskey Invalid");
}
$pimporter = new PresetImporter($course, $cm, $data, $CFG->dirroot.$file);
$pimporter->import_options();
break;
/* Imports a zip file. */
case 'importzip' :
if (!confirm_sesskey()) {
error("Sesskey Invalid");
}
if (!make_upload_directory('temp/data/'.$USER->id)) {
error("Can't Create Directory");
}
$presetfile = $CFG->dataroot."/temp/data/".$USER->id;
clean_preset($presetfile);
if (!unzip_file($CFG->dataroot."/$course->id/$file",
$presetfile, false))
error("Can't unzip file");
$pimporter = new PresetImporter($course, $cm, $data, $presetfile);
$pimporter->import_options();
break;
case 'finishimport':
if (!confirm_sesskey()) {
error('Sesskey Invalid');
}
$pimporter = new PresetImporter($course, $cm, $data, $file);
$pimporter->import();
$strimportsuccess = get_string('importsuccess', 'data');
$straddentries = get_string('addentries', 'data');
$strtodatabase = get_string('todatabase', 'data');
if (!get_records('data_records', 'dataid', $data->id)) {
notify("$strimportsuccess <a href='edit.php?d=$data->id'>$straddentries</a> $strtodatabase", 'notifysuccess');
}
else {
notify("$strimportsuccess", 'notifysuccess');
}
break;
/* Exports as a zip file ready for download. */
case 'export':
$file = data_presets_export($course, $cm, $data);
echo get_string('exportedtozip', 'data')."<br>";
$perminantfile = $CFG->dataroot."/$course->id/moddata/data/$data->id/preset.zip";
@unlink($perminantfile);
/* is this created elsewhere? sometimes its not present... */
make_upload_directory("$course->id/moddata/data/$data->id");
/* now just move the zip into this folder to allow a nice download */
if (!rename($file, $perminantfile)) error("Can't move zip");
echo "<a href='$CFG->wwwroot/file.php/$course->id/moddata/data/$data->id/preset.zip'>".get_string('download', 'data')."</a>";
break;
/***************** Exporting *****************/
case 'save1':
if (!confirm_sesskey()) {
error("Sesskey Invalid");
}
$strcontinue = get_string('continue');
$strwarning = get_string('presetwarning', 'data');
echo "<div align=center>";
echo "<p>$strwarning</p>";
echo "<form action='' method='POST'>";
echo "Name: <input type='textbox' name='name' value=\"$data->name\" />";
echo "<input type='hidden' name='action' value='save2' />";
echo "<input type='hidden' name='d' value='$data->id' />";
echo "<input type='hidden' name='sesskey' value='$sesskey' />";
echo "<input type='submit' value='$strcontinue' /></form></div>";
break;
case 'save2':
if (!confirm_sesskey()) {
error("Sesskey Invalid");
}
$strcontinue = get_string('continue');
$stroverwrite = get_string('overwrite');
$name = optional_param('name', $data->name, PARAM_FILE);
if (is_directory_a_preset("$CFG->dirroot/mod/data/preset/$USER->id/$name")) {
notify("Preset already exists: Pick another name or overwrite");
echo "<div align=center>";
echo "<form action='' method='POST'>";
echo "New name: <input type='textbox' name='name' value=\"$name\" />";
echo "<input type='hidden' name='action' value='save2' />";
echo "<input type='hidden' name='d' value='$data->id' />";
echo "<input type='hidden' name='sesskey' value='$sesskey' />";
echo "<input type='submit' value='$strcontinue' /></form>";
echo "<form action='' method='POST'>";
echo "<input type='hidden' name='name' value=\"$name\" />";
echo "<input type='hidden' name='action' value='save3' />";
echo "<input type='hidden' name='d' value='$data->id' />";
echo "<input type='hidden' name='sesskey' value='$sesskey' />";
echo "<input type='submit' value='$stroverwrite' /></form>";
echo "</div>";
break;
}
case 'save3':
if (!confirm_sesskey()) {
error("Sesskey Invalid");
}
$name = optional_param('name', $data->name, PARAM_FILE);
$presetdirectory = "$CFG->dirroot/mod/data/preset/$USER->id/$name";
if (!is_dir($presetdirectory)) {
@mkdir("$CFG->dirroot/mod/data/preset/$USER->id");
mkdir($presetdirectory);
}
else {
clean_preset($presetdirectory);
}
$file = data_presets_export($course, $cm, $data);
if (!unzip_file($file, $presetdirectory, false)) error("Can't unzip to the preset directory");
notify(get_string('savesuccess', 'data'), 'notifysuccess');
break;
}
echo "</center>";
print_footer($course);
function is_directory_a_preset($directory) {
$directory = rtrim($directory, '/\\') . '/';
if (file_exists($directory.'singletemplate.html') &&
file_exists($directory.'listtemplate.html') &&
file_exists($directory.'listtemplateheader.html') &&
file_exists($directory.'listtemplatefooter.html') &&
file_exists($directory.'addtemplate.html') &&
file_exists($directory.'rsstemplate.html') &&
file_exists($directory.'rsstitletemplate.html') &&
file_exists($directory.'csstemplate.css') &&
file_exists($directory.'jstemplate.js') &&
file_exists($directory.'preset.xml')) return true;
else return false;
}
function data_presets_print_header($course, $cm, $data, $showtabs=true) {
global $CFG, $displaynoticegood, $displaynoticebad;
$strdata = get_string('modulenameplural','data');
print_header_simple($data->name, '', "<a href='index.php?id=$course->id'>$strdata</a> -> $data->name",
'', '', true, '', navmenu($course, $cm));
print_heading(format_string($data->name));
/// Print the tabs
if ($showtabs) {
$currenttab = 'presets';
include_once('tabs.php');
}
/// Print any notices
if (!empty($displaynoticegood)) {
notify($displaynoticegood, 'notifysuccess'); // good (usually green)
} else if (!empty($displaynoticebad)) {
notify($displaynoticebad); // bad (usuually red)
}
}
function clean_preset($folder) {
if (unlink($folder.'/singletemplate.html') &&
unlink($folder.'/listtemplate.html') &&
unlink($folder.'/listtemplateheader.html') &&
unlink($folder.'/listtemplatefooter.html') &&
unlink($folder.'/addtemplate.html') &&
unlink($folder.'/rsstemplate.html') &&
unlink($folder.'/rsstitletemplate.html') &&
unlink($folder.'/csstemplate.css') &&
unlink($folder.'/jstemplate.js') &&
unlink($folder.'/preset.xml')) return true;
else return false;
}
function data_presets_export($course, $cm, $data) {
global $CFG;
/* Info Collected. Now need to make files in moodledata/temp */
$tempfolder = $CFG->dataroot.'/temp';
$singletemplate = fopen($tempfolder.'/singletemplate.html', 'w');
$listtemplate = fopen($tempfolder.'/listtemplate.html', 'w');
$listtemplateheader = fopen($tempfolder.'/listtemplateheader.html', 'w');
$listtemplatefooter = fopen($tempfolder.'/listtemplatefooter.html', 'w');
$addtemplate = fopen($tempfolder.'/addtemplate.html', 'w');
$rsstemplate = fopen($tempfolder.'/rsstemplate.html', 'w');
$rsstitletemplate = fopen($tempfolder.'/rsstitletemplate.html', 'w');
$csstemplate = fopen($tempfolder.'/csstemplate.css', 'w');
$jstemplate = fopen($tempfolder.'/jstemplate.js', 'w');
fwrite($singletemplate, $data->singletemplate);
fwrite($listtemplate, $data->listtemplate);
fwrite($listtemplateheader, $data->listtemplateheader);
fwrite($listtemplatefooter, $data->listtemplatefooter);
fwrite($addtemplate, $data->addtemplate);
fwrite($rsstemplate, $data->rsstemplate);
fwrite($rsstitletemplate, $data->rsstitletemplate);
fwrite($csstemplate, $data->csstemplate);
fwrite($jstemplate, $data->jstemplate);
fclose($singletemplate);
fclose($listtemplate);
fclose($listtemplateheader);
fclose($listtemplatefooter);
fclose($addtemplate);
fclose($rsstemplate);
fclose($rsstitletemplate);
fclose($csstemplate);
fclose($jstemplate);
/* All the display data is now done. Now assemble preset.xml */
$fields = get_records('data_fields', 'dataid', $data->id);
$presetfile = fopen($tempfolder.'/preset.xml', 'w');
$presetxml = "<preset>\n\n";
/* Database settings first. Name not included? */
$settingssaved = array('intro', 'comments', 'ratings', 'participants',
'requiredentries', 'requiredentriestoview', 'maxentries',
'rssarticles', 'approval', 'scale', 'assessed', 'assessedpublic',
'defaultsort', 'defaultsortdir', 'editany');
$presetxml .= "<settings>\n";
foreach ($settingssaved as $setting) {
$presetxml .= "<$setting>{$data->$setting}</$setting>\n";
}
$presetxml .= "</settings>\n\n";
/* Now for the fields. Grabs all settings that are non-empty */
if (!empty($fields)) {
foreach ($fields as $field) {
$presetxml .= "<field>\n";
foreach ($field as $key => $value) {
if ($value != '' && $key != 'id' && $key != 'dataid') {
$presetxml .= "<$key>$value</$key>\n";
}
}
$presetxml .= "</field>\n\n";
}
}
$presetxml .= "</preset>";
fwrite($presetfile, $presetxml);
fclose($presetfile);
/* Check all is well */
if (!is_directory_a_preset($tempfolder)) {
error("Not all files generated!");
}
$filelist = array(
"singletemplate.html",
"listtemplate.html",
"listtemplateheader.html",
"listtemplatefooter.html",
"addtemplate.html",
"rsstemplate.html",
"rsstitletemplate.html",
"csstemplate.css",
"jstemplate.js",
"preset.xml");
foreach ($filelist as $key => $file) {
$filelist[$key] = $tempfolder.'/'.$filelist[$key];
}
@unlink($tempfolder.'/export.zip');
$status = zip_files($filelist, $tempfolder.'/export.zip');
/* made the zip... now return the filename for storage.*/
return $tempfolder.'/export.zip';
}
class PresetImporter {
function PresetImporter($course, $cm, $data, $folder) {
global $CFG;
$this->course = $course;
$this->cm = $cm;
$this->data = $data;
$this->folder = $folder;
$this->postfolder = $folder;
}
function get_settings() {
global $CFG;
if (!is_directory_a_preset($this->folder)) {
error("$this->folder Not a preset");
}
/* Grab XML */
$presetxml = file_get_contents($this->folder.'/preset.xml');
$parsedxml = xmlize($presetxml);
/* First, do settings. Put in user friendly array. */
$settingsarray = $parsedxml['preset']['#']['settings'][0]['#'];
$settings = new StdClass();
foreach ($settingsarray as $setting => $value) {
$settings->$setting = $value[0]['#'];
}
/* Now work out fields to user friendly array */
$fieldsarray = $parsedxml['preset']['#']['field'];
$fields = array();
foreach ($fieldsarray as $field) {
$f = new StdClass();
foreach ($field['#'] as $param => $value) {
$f->$param = $value[0]['#'];
}
$f->dataid = $this->data->id;
$fields[] = $f;
}
/* Now add the HTML templates to the settings array so we can update d */
$settings->singletemplate = file_get_contents($this->folder."/singletemplate.html");
$settings->listtemplate = file_get_contents($this->folder."/listtemplate.html");
$settings->listtemplateheader = file_get_contents($this->folder."/listtemplateheader.html");
$settings->listtemplatefooter = file_get_contents($this->folder."/listtemplatefooter.html");
$settings->addtemplate = file_get_contents($this->folder."/addtemplate.html");
$settings->rsstemplate = file_get_contents($this->folder."/rsstemplate.html");
$settings->rsstitletemplate = file_get_contents($this->folder."/rsstitletemplate.html");
$settings->csstemplate = file_get_contents($this->folder."/csstemplate.css");
$settings->jstemplate = file_get_contents($this->folder."/jstemplate.js");
$settings->instance = $this->data->id;
/* Now we look at the current structure (if any) to work out whether we need to clear db
or save the data */
$currentfields = array();
$currentfields = get_records('data_fields', 'dataid', $this->data->id);
return array($settings, $fields, $currentfields);
}
function import_options() {
if (!confirm_sesskey()) {
error("Sesskey Invalid");
}
$strblank = get_string('blank', 'data');
$strnofields = get_string('nofields', 'data');
$strcontinue = get_string("continue");
$sesskey = sesskey();
$strwarning = get_string('mappingwarning', 'data');
$strfieldmappings = get_string('fieldmappings', 'data');
$strnew = get_string("new");
$strold = get_string("old");
list($settings, $newfields, $currentfields) = $this->get_settings();
echo "<div align='center'><form action='' method='POST'>";
echo "<input type='hidden' name='sesskey' value='$sesskey' />";
echo "<input type='hidden' name='d' value='{$this->data->id}' />";
echo "<input type='hidden' name='action' value='finishimport' />";
echo "<input type='hidden' name='file' value=\"$this->postfolder\" />";
if ($currentfields != array() && $newfields != array()) {
echo "<h3>$strfieldmappings ";
echo helpbutton('fieldmappings', '', 'data');
echo "</h3><table>";
foreach ($newfields as $nid => $newfield) {
echo "<tr><td>$newfield->name </td>";
echo "<td><select name='field_$nid'>";
foreach ($currentfields as $cid => $currentfield) {
if ($currentfield->type == $newfield->type) {
if ($currentfield->name == $newfield->name) {
echo "<option value='$cid' selected='true'>$currentfield->name</option>";
$selected=true;
}
else {
echo "<option value='$cid'>$currentfield->name</option>";
}
}
}
if ($selected)
echo "<option value='-1'>-</option>";
else
echo "<option value='-1' selected='true'>-</option>";
echo "</select></td></tr>";
}
echo "</table>";
echo "<p>$strwarning</p>";
}
else if ($newfields == array()) {
error("New preset has no defined fields!");
}
echo "<input type='submit' value='$strcontinue' /></form></div>";
}
function import() {
global $CFG;
list($settings, $newfields, $currentfields) = $this->get_settings();
$preservedfields = array();
/* Maps fields and makes new ones */
if ($newfields != array()) {
/* We require an injective mapping, and need to know what to protect */
foreach ($newfields as $nid => $newfield) {
$cid = optional_param("field_$nid", -1, PARAM_INT);
if ($cid == -1) continue;
if (array_key_exists($cid, $preservedfields)) error("Not an injective map");
else $preservedfields[$cid] = true;
}
foreach ($newfields as $nid => $newfield) {
$cid = optional_param("field_$nid", -1, PARAM_INT);
/* A mapping. Just need to change field params. Data kept. */
if ($cid != -1) {
$fieldobject = data_get_field_from_id($currentfields[$cid]->id, $this->data);
foreach ($newfield as $param => $value) {
if ($param != "id") {
$fieldobject->field->$param = $value;
}
}
unset($fieldobject->field->similarfield);
$fieldobject->update_field();
unset($fieldobject);
}
/* Make a new field */
else {
include_once("field/$newfield->type/field.class.php");
$classname = 'data_field_'.$newfield->type;
$fieldclass = new $classname($newfield, $this->data);
$fieldclass->insert_field();
unset($fieldclass);
}
}
}
/* Get rid of all old unused data */
if ($preservedfields != array()) {
foreach ($currentfields as $cid => $currentfield) {
if (!array_key_exists($cid, $preservedfields)) {
/* Data not used anymore so wipe! */
print "Deleting field $currentfield->name<br>";
$id = $currentfield->id;
if ($content = get_records('data_content', 'fieldid', $id)) {
foreach ($content as $item) {
delete_records('data_ratings', 'recordid', $item->recordid);
delete_records('data_comments', 'recordid', $item->recordid);
delete_records('data_records', 'id', $item->recordid);
}
}
delete_records('data_content', 'fieldid', $id);
delete_records('data_fields', 'id', $id);
}
}
}
data_update_instance(addslashes_object($settings));
if (strstr($this->folder, "/temp/")) clean_preset($this->folder); /* Removes the temporary files */
return true;
}
}
?>
ACTIVITY MODULES
----------------
These are main modules in Moodle, allowing various activities.
Each of these modules contains a number of expected components:
mod.html: a form to setup/update a module instance
version.php: defines some meta-info and provides upgrading code
icon.gif: a 16x16 icon for the module
db/mysql.sql: an SQL dump of all the required db tables and data
index.php: a page to list all instances in a course
view.php: a page to view a particular instance
lib.php: any/all functions defined by the module should be in here.
constants should be defined using MODULENAME_xxxxxx
functions should be defined using modulename_xxxxxx
There are a number of standard functions:
modulename_add_instance()
modulename_update_instance()
modulename_delete_instance()
modulename_user_complete()
modulename_user_outline()
modulename_cron()
modulename_print_recent_activity()
If you are a developer and interested in developing new Modules see:
Moodle Documentation: http://moodle.org/doc
Moodle Community: http://moodle.org/community