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inspect.php
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inspect.php
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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/>.
/**
* Script to upload responses saved from the emergency download link.
*
* @package quizaccess_wifiresilience
* @copyright 2017 ETH Zurich ([email protected])
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
require_once(__DIR__ . '/../../../../config.php');
require_once($CFG->dirroot . '/repository/lib.php');
require_once($CFG->dirroot . '/mod/quiz/locallib.php');
$cmid = optional_param('id', 0, PARAM_INT);
$cm = get_coursemodule_from_id('quiz', $cmid, 0, false, MUST_EXIST);
$course = $DB->get_record('course', array('id' => $cm->course), '*', MUST_EXIST);
$quiz = $DB->get_record('quiz', array('id' => $cm->instance), '*', MUST_EXIST);
$quizurl = new moodle_url('/mod/quiz/view.php', array('id' => $cm->id));
$context = context_module::instance($cm->id);
$PAGE->set_url('/mod/quiz/accessrule/wifiresilience/inspect.php', array('id' => $cmid));
require_login($course, false, $cm);
require_capability('quizaccess/wifiresilience:inspectresponses', $context);
$form = new \quizaccess_wifiresilience\form\inspect_responses($PAGE->url);
if ($form->is_cancelled()) {
echo '<script>setTimeout(function() {window.location="'.$quizurl.'";}, 0);</script>';
} else if ($fromform = $form->get_data()) {
// Process submission.
$title = get_string('uploadinspection', 'quizaccess_wifiresilience',
format_string($quiz->name, true, array('context' => $context)));
$PAGE->navbar->add($title);
$PAGE->set_pagelayout('admin');
$PAGE->set_title($title);
$PAGE->set_heading($course->fullname);
$PAGE->requires->strings_for_js(array('downloadfile'), 'quizaccess_wifiresilience');
$PAGE->requires->yui_module(
'moodle-quizaccess_wifiresilience-initialiseinspect',
'M.quizaccess_wifiresilience.initialiseinspect.init',
array()
);
$files = get_file_storage()->get_area_files(context_user::instance($USER->id)->id,
'user', 'draft', $fromform->responsefiles, 'id');
$filesprocessed = 0;
$privatekey = null;
$privatekeystring = get_config('quizaccess_wifiresilience', 'privatekey');
if ($privatekeystring) {
$privatekey = openssl_get_privatekey($privatekeystring);
}
echo $OUTPUT->header();
echo $OUTPUT->heading($title);
foreach ($files as $file) {
if ($file->get_filepath() !== '/') {
continue;
}
if ($file->is_external_file()) {
continue;
}
if ($file->is_directory()) {
continue;
}
echo $OUTPUT->heading(get_string('decryptingfile', 'quizaccess_wifiresilience', s($file->get_filename())), 3);
$originalpost = null;
$originalrequest = null;
try {
$data = json_decode($file->get_content());
if (!$data) {
if (function_exists('json_last_error_msg')) {
throw new coding_exception(json_last_error_msg());
} else {
throw new coding_exception('JSON error: ' . json_last_error());
}
}
if (!isset($data->responses)) {
echo $OUTPUT->notification(get_string('filenoresponses', 'quizaccess_wifiresilience'), 'notifyfail');
} else {
if (isset($data->iv) || isset($data->key)) {
if (!$privatekey) {
echo $OUTPUT->notification(
get_string('filenodecryptionkey', 'quizaccess_wifiresilience'), 'notifyfail');
}
$encryptedaeskey = base64_decode($data->key);
if (!$encryptedaeskey) {
echo $OUTPUT->notification(
get_string('fileencryptedkeynobase64', 'quizaccess_wifiresilience'), 'notifyfail');
}
$encryptediv = base64_decode($data->iv);
if (!$encryptediv) {
echo $OUTPUT->notification(
get_string('fileencryptedinitvaluenobase64', 'quizaccess_wifiresilience'), 'notifyfail');
}
$aeskeystring = '';
if (!openssl_private_decrypt($encryptedaeskey, $aeskeystring, $privatekey)) {
echo $OUTPUT->notification(
get_string('fileunabledecryptkey', 'quizaccess_wifiresilience', openssl_error_string()), 'notifyfail');
}
$ivstring = '';
if (!openssl_private_decrypt($encryptediv, $ivstring, $privatekey)) {
echo $OUTPUT->notification(
get_string('fileunabledecryptkey', 'quizaccess_wifiresilience', openssl_error_string()), 'notifyfail');
}
$aeskey = base64_decode($aeskeystring);
if (!$aeskey) {
echo $OUTPUT->notification(
get_string('filekeynobase64', 'quizaccess_wifiresilience'), 'notifyfail');
}
$iv = base64_decode($ivstring);
if (!$iv) {
echo $OUTPUT->notification(
get_string('fileinitvaluenobase64', 'quizaccess_wifiresilience'), 'notifyfail');
}
$responses = openssl_decrypt($data->responses, 'AES-256-CBC', $aeskey, 0, $iv);
if (!$responses) {
echo $OUTPUT->notification(
get_string('fileunabledecrypt', 'quizaccess_wifiresilience', openssl_error_string()), 'notifyfail');
} else {
$postdata = array();
parse_str($responses, $postdata);
echo get_string('filewithoutkeyandiv', 'quizaccess_wifiresilience');
echo html_writer::tag('textarea', $responses,
array('id' => 'quizaccess_wifiresilience_dectypted_file_output_json', 'class' => 'inspectresponse'));
echo get_string('filearraystyle', 'quizaccess_wifiresilience');
echo html_writer::tag('textarea', s(var_export($postdata, true)),
array('id' => 'quizaccess_wifiresilience_dectypted_file_output_array', 'class' => 'inspectresponse'));
}
} else {
$responses = $data->responses;
// Get original before encryption work.
$encodeddata = $data;
$encodeddata->responses = $responses;
$encodeddataback = json_encode($encodeddata);
$encodeddatawithoutkey = $encodeddata;
$encodeddatawithoutkey->iv = '';
unset($encodeddatawithoutkey->iv);
$encodeddatawithoutkey->key = '';
unset($encodeddatawithoutkey->key);
$encodeddatabackwithoutkey = json_encode($encodeddatawithoutkey);
$postdata = array();
parse_str($responses, $postdata);
if (!isset($postdata['attempt'])) {
echo html_writer::tag('div', get_string('filenoattemptid', 'quizaccess_wifiresilience'),
array('class' => 'alert alert-error'));
}
echo get_string('filewithkeyandiv', 'quizaccess_wifiresilience');
echo html_writer::tag('textarea', $encodeddataback,
array('id' => 'quizaccess_wifiresilience_dectypted_file_output_json', 'class' => 'inspectresponse'));
echo html_writer::tag('div', '',
array('id' => 'quizaccess_wifiresilience_dectypted_file_output_json_link'));
echo get_string('filewithoutkeyandiv', 'quizaccess_wifiresilience');
echo html_writer::tag('textarea', $encodeddatabackwithoutkey,
array('id' => 'quizaccess_wifiresilience_dectypted_file_output_json_nokey', 'class' => 'inspectresponse'));
echo html_writer::tag('div', '',
array('id' => 'quizaccess_wifiresilience_dectypted_file_output_json_nokey_link'));
echo get_string('filearraystyle', 'quizaccess_wifiresilience');
echo html_writer::tag('textarea', s(var_export($postdata, true)),
array('id' => 'quizaccess_wifiresilience_dectypted_file_output_array', 'class' => 'inspectresponse'));
echo html_writer::tag('div', '',
array('id' => 'quizaccess_wifiresilience_dectypted_file_output_array_link'));
// Process the uploaded data. (We have to do weird fakery with $_POST && $_REQUEST).
$timenow = time();
$postdata['sesskey'] = sesskey();
$originalpost = $_POST;
$_POST = $postdata;
$originalrequest = $_REQUEST;
$_REQUEST = $postdata;
$_POST = $originalpost;
$originalpost = null;
$_REQUEST = $originalrequest;
$originalrequest = null;
// Display a success message.
echo $OUTPUT->notification(get_string('inspectionprocessedsuccessfully', 'quizaccess_wifiresilience'),
'notifysuccess');
}
}
} catch (Exception $e) {
if ($originalpost !== null) {
$_POST = $originalpost;
$originalpost = null;
}
if ($originalrequest !== null) {
$_REQUEST = $originalrequest;
$originalrequest = null;
}
echo $OUTPUT->box_start();
echo $OUTPUT->heading(get_string('uploadfailed', 'quizaccess_wifiresilience'), 4);
echo $OUTPUT->notification($e->getMessage());
echo format_backtrace($e->getTrace());
echo $OUTPUT->box_end();
}
}
if ($privatekey) {
openssl_pkey_free($privatekey);
}
echo \html_writer::div($OUTPUT->single_button($quizurl, get_string('continue'), 'get'));
echo $OUTPUT->footer();
} else {
// Show the form.
$title = get_string('uploadinspectionfor', 'quizaccess_wifiresilience',
format_string($quiz->name, true, array('context' => $context)));
$PAGE->navbar->add($title);
$PAGE->set_pagelayout('admin');
$PAGE->set_title($title);
$PAGE->set_heading($course->fullname);
echo $OUTPUT->header();
echo $OUTPUT->heading($title);
echo $OUTPUT->box(get_string('inspectingfiledesc', 'quizaccess_wifiresilience'),
array('class' => 'alert alert-warning'));
$form->display();
echo $OUTPUT->footer();
}