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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/>.
/**
* This file is the main controller to do with the portfolio export wizard.
*
* @package core_portfolio
* @copyright 2008 Penny Leach <penny@catalyst.net.nz>,
* Martin Dougiamas <http://dougiamas.com>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL
*/
require_once(__DIR__ . '/../config.php');
if (empty($CFG->enableportfolios)) {
print_error('disabled', 'portfolio');
}
require_once($CFG->libdir . '/portfoliolib.php');
require_once($CFG->libdir . '/portfolio/exporter.php');
require_once($CFG->libdir . '/portfolio/caller.php');
require_once($CFG->libdir . '/portfolio/plugin.php');
$dataid = optional_param('id', 0, PARAM_INT); // The ID of partially completed export, corresponds to a record in portfolio_tempdata.
$type = optional_param('type', null, PARAM_SAFEDIR); // If we're returning from an external system (postcontrol) for a single-export only plugin.
$cancel = optional_param('cancel', 0, PARAM_RAW); // User has cancelled the request.
$cancelsure = optional_param('cancelsure', 0, PARAM_BOOL); // Make sure they confirm first.
$logreturn = optional_param('logreturn', 0, PARAM_BOOL); // When cancelling, we can also come from the log page, rather than the caller.
$instanceid = optional_param('instance', 0, PARAM_INT); // The instance of configured portfolio plugin.
$courseid = optional_param('course', 0, PARAM_INT); // The courseid the data being exported belongs to (caller object should provide this later).
$stage = optional_param('stage', PORTFOLIO_STAGE_CONFIG, PARAM_INT); // Stage of the export we're at (stored in the exporter).
$postcontrol = optional_param('postcontrol', 0, PARAM_INT); // When returning from some bounce to an external system, this gets passed.
$callbackcomponent = optional_param('callbackcomponent', null, PARAM_PATH); // Callback component eg mod_forum - the component of the exporting content.
$callbackclass = optional_param('callbackclass', null, PARAM_ALPHAEXT); // Callback class eg forum_portfolio_caller - the class to handle the exporting content.
$callerformats = optional_param('callerformats', null, PARAM_TAGLIST); // Comma separated list of formats the specific place exporting content supports.
require_login(); // this is selectively called again with $course later when we know for sure which one we're in.
$PAGE->set_context(context_system::instance());
$PAGE->set_url('/portfolio/add.php', array('id' => $dataid, 'sesskey' => sesskey()));
$PAGE->set_pagelayout('admin');
$exporter = null;
if ($postcontrol && $type && !$dataid) {
// we're returning from an external system that can't construct dynamic return urls
// this is a special "one export of this type only per session" case
if (portfolio_static_function($type, 'allows_multiple_exports')) {
throw new portfolio_exception('multiplesingleresume', 'portfolio');
}
if (!$dataid = portfolio_export_type_to_id($type, $USER->id)) {
throw new portfolio_exception('invalidtempid', 'portfolio');
}
} else {
// we can't do this in the above case, because we're redirecting straight back from an external system
// this is not really ideal, but since we're in a "staged" wizard, the session key is checked in other stages.
require_sesskey(); // pretty much everything in this page is a write that could be hijacked, so just do this at the top here
}
// if we have a dataid, it means we're in the middle of an export,
// so rewaken it and continue.
if (!empty($dataid)) {
try {
$exporter = portfolio_exporter::rewaken_object($dataid);
} catch (portfolio_exception $e) {
// this can happen in some cases, a cancel request is sent when something is already broken
// so process it elegantly and move on.
if ($cancel) {
if ($logreturn) {
redirect($CFG->wwwroot . '/user/portfoliologs.php');
}
redirect($CFG->wwwroot);
} else {
throw $e;
}
}
// we have to wake it up first before we can cancel it
// so temporary directories etc get cleaned up.
if ($cancel) {
if ($cancelsure) {
$exporter->cancel_request($logreturn);
} else {
portfolio_export_pagesetup($PAGE, $exporter->get('caller'));
$exporter->print_header(get_string('confirmcancel', 'portfolio'));
echo $OUTPUT->box_start();
$yesbutton = new single_button(new moodle_url('/portfolio/add.php', array('id' => $dataid, 'cancel' => 1, 'cancelsure' => 1, 'logreturn' => $logreturn)), get_string('yes'));
if ($logreturn) {
$nobutton = new single_button(new moodle_url('/user/portfoliologs.php'), get_string('no'));
} else {
$nobutton = new single_button(new moodle_url('/portfolio/add.php', array('id' => $dataid)), get_string('no'));
}
echo $OUTPUT->confirm(get_string('confirmcancel', 'portfolio'), $yesbutton, $nobutton);
echo $OUTPUT->box_end();
echo $OUTPUT->footer();
exit;
}
}
// verify we still belong to the correct user and permissions are still ok
$exporter->verify_rewaken();
// if we don't have an instanceid in the exporter
// it means we've just posted from the 'choose portfolio instance' page
// so process that and start up the portfolio plugin
if (!$exporter->get('instance')) {
if ($instanceid) {
try {
$instance = portfolio_instance($instanceid);
} catch (portfolio_exception $e) {
portfolio_export_rethrow_exception($exporter, $e);
}
// this technically shouldn't happen but make sure anyway
if ($broken = portfolio_instance_sanity_check($instance)) {
throw new portfolio_export_exception($exporter, $broken[$instance->get('id')], 'portfolio_' . $instance->get('plugin'));
}
// now we're all set up, ready to go
$instance->set('user', $USER);
$exporter->set('instance', $instance);
$exporter->save();
}
}
portfolio_export_pagesetup($PAGE, $exporter->get('caller')); // this calls require_login($course) if it can..
// completely new request, look to see what information we've been passed and set up the exporter object.
} else {
// you cannot get here with no information for us, we must at least have the caller.
if (empty($_GET) && empty($_POST)) {
portfolio_exporter::print_expired_export();
}
// we'e just posted here for the first time and have might the instance already
if ($instanceid) {
// this can throw exceptions but there's no point catching and rethrowing here
// as the exporter isn't created yet.
$instance = portfolio_instance($instanceid);
if ($broken = portfolio_instance_sanity_check($instance)) {
throw new portfolio_exception($broken[$instance->get('id')], 'portfolio_' . $instance->get('plugin'));
}
$instance->set('user', $USER);
} else {
$instance = null;
}
// we must be passed this from the caller, we cannot start a new export
// without knowing information about what part of moodle we come from.
if (empty($callbackcomponent) || empty($callbackclass)) {
debugging('no callback file or class');
portfolio_exporter::print_expired_export();
}
// so each place in moodle can pass callback args here
// process the entire request looking for ca_*
// be as lenient as possible while still being secure
// so only accept certain parameter types.
$callbackargs = array();
foreach (array_keys(array_merge($_GET, $_POST)) as $key) {
if (strpos($key, 'ca_') === 0) {
if (!$value = optional_param($key, false, PARAM_ALPHAEXT)) {
if (!$value = optional_param($key, false, PARAM_FLOAT)) {
$value = optional_param($key, false, PARAM_PATH);
}
}
// strip off ca_ for niceness
$callbackargs[substr($key, 3)] = $value;
}
}
// Ensure that we found a file we can use, if not throw an exception.
portfolio_include_callback_file($callbackcomponent, $callbackclass);
$caller = new $callbackclass($callbackargs);
$caller->set('user', $USER);
if ($formats = explode(',', $callerformats)) {
$caller->set_formats_from_button($formats);
}
$caller->load_data();
// this must check capabilities and either throw an exception or return false.
if (!$caller->check_permissions()) {
throw new portfolio_caller_exception('nopermissions', 'portfolio', $caller->get_return_url());
}
portfolio_export_pagesetup($PAGE, $caller); // this calls require_login($course) if it can..
// finally! set up the exporter object with the portfolio instance, and caller information elements
$exporter = new portfolio_exporter($instance, $caller, $callbackcomponent);
// set the export-specific variables, and save.
$exporter->set('user', $USER);
$exporter->save();
}
if (!$exporter->get('instance')) {
// we've just arrived but have no instance
// in this case the exporter object and the caller object have been set up above
// so just make a little form to select the portfolio plugin instance,
// which is the last thing to do before starting the export.
//
// first check to make sure there is actually a point
$options = portfolio_instance_select(
portfolio_instances(),
$exporter->get('caller')->supported_formats(),
get_class($exporter->get('caller')),
$exporter->get('caller')->get_mimetype(),
'instance',
true,
true
);
if (empty($options)) {
throw new portfolio_export_exception($exporter, 'noavailableplugins', 'portfolio');
} else if (count($options) == 1) {
// no point displaying a form, just redirect.
$optionskeys = array_keys($options);
$instance = array_shift($optionskeys);
redirect($CFG->wwwroot . '/portfolio/add.php?id= ' . $exporter->get('id') . '&instance=' . $instance . '&sesskey=' . sesskey());
}
// be very selective about not including this unless we really need to
require_once($CFG->libdir . '/portfolio/forms.php');
$mform = new portfolio_instance_select('', array('id' => $exporter->get('id'), 'caller' => $exporter->get('caller'), 'options' => $options));
if ($mform->is_cancelled()) {
$exporter->cancel_request();
} else if ($fromform = $mform->get_data()){
redirect($CFG->wwwroot . '/portfolio/add.php?instance=' . $fromform->instance . '&id=' . $exporter->get('id'));
exit;
}
else {
$exporter->print_header(get_string('selectplugin', 'portfolio'));
echo $OUTPUT->box_start();
$mform->display();
echo $OUTPUT->box_end();
echo $OUTPUT->footer();
exit;
}
}
// if we haven't been passed &stage= grab it from the exporter.
if (!$stage) {
$stage = $exporter->get('stage');
}
// for places returning control to pass (rather than PORTFOLIO_STAGE_PACKAGE
// which is unstable if they can't get to the constant (eg external system)
$alreadystolen = false;
if ($postcontrol) { // the magic request variable plugins must pass on returning here
try {
// allow it to read whatever gets sent back in the request
// this is useful for plugins that redirect away and back again
// adding a token to the end of the url, for example box.net
$exporter->instance()->post_control($stage, array_merge($_GET, $_POST));
} catch (portfolio_plugin_exception $e) {
portfolio_export_rethrow_exception($exporter, $e);
}
$alreadystolen = true; // remember this so we don't get caught in a steal control loop!
}
// actually do the work now..
$exporter->process_stage($stage, $alreadystolen);