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api.php
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api.php
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<?php
ini_set('display_errors', 'on');
error_reporting(E_ALL);
require_once '../../config.php';
if (isloggedin()) {
$context_sys = get_context_instance(CONTEXT_SYSTEM);
if (!has_capability('moodle/course:create', $context_sys)) result_output('A001', null, 'Permission denied', true, 403);
if (isset($_REQUEST['action']) && function_exists($_REQUEST['action'])) {
$_REQUEST['action']();
result_output('0', null, 'OK');
} else {
result_output('R002', null, 'Bad request', true, 400);
}
} else {
result_output('R001', null, 'User not logged in', true, 403);
}
function updateCat() {
global $DB;
if (isset($_REQUEST['name'])) {
switch ($_REQUEST['name']) {
case 'cat-name':
$row_name = 'name';
break;
case 'cat-info':
$row_name = 'info';
break;
default:
result_output('R002', null, 'Bad request', true, 400);
}
} else {
result_output('R002', null, 'Bad request', true, 400);
}
if (!isset($_REQUEST['value'], $_REQUEST['pk']) || !is_numeric($_REQUEST['pk'])) result_output('R002', null, 'Bad request', true, 400);
$DB->set_field('question_categories', $row_name, $_REQUEST['value'], ['id' => $_REQUEST['pk']]);
}
function updateQuestion() {
global $DB;
if (isset($_REQUEST['name'])) {
switch ($_REQUEST['name']) {
case 'qbank-name':
$table_name = 'question';
$row_name = 'name';
break;
case 'qbank-info':
$table_name = 'question';
$row_name = 'questiontext';
break;
case 'qbank-feedback':
$table_name = 'question';
$row_name = 'generalfeedback';
break;
case 'qbank-correctans':
$table_name = 'question_answers';
$row_name = 'answer';
break;
default:
result_output('R002', null, 'Bad request', true, 400);
}
} else {
result_output('R002', null, 'Bad request', true, 400);
}
if (!isset($_REQUEST['value'], $_REQUEST['pk']) || !is_numeric($_REQUEST['pk'])) result_output('R002', null, 'Bad request', true, 400);
$DB->set_field($table_name, $row_name, $_REQUEST['value'], ['id' => $_REQUEST['pk']]);
}
function switchBeep() {
global $DB;
if (isset($_REQUEST['qid'], $_REQUEST['enable']) && is_numeric($_REQUEST['qid']) && is_bool((bool) $_REQUEST['enable'])) {
$question = $DB->get_records('question', ['id' => (int) $_REQUEST['qid']]);
if (count($question) == 1) $question = $question[(int) $_REQUEST['qid']];
else result_output('I001', null, 'Question not exists', true);
$question->qtype = strtolower($question->qtype);
switch ($question->qtype) {
case 'multichoice':
$old_type = $question->qtype;
$new_type = 'beepmulchoice';
$old_table = 'qtype_multichoice_options';
$new_table = 'qtype_beepmulchoice_options';
$col_name = 'questionid';
break;
case 'beepmulchoice':
$old_type = $question->qtype;
$new_type = 'multichoice';
$old_table = 'qtype_beepmulchoice_options';
$new_table = 'qtype_multichoice_options';
$col_name = 'questionid';
break;
case 'truefalse':
case 'beeptruefalse':
$old_type = $question->qtype;
$new_type = substr($old_type, 0, 4) == 'beep' ? substr($old_type, 4) : ('beep' . $old_type);
$old_table = 'question_' . $old_type;
$new_table = 'question_' . $new_type;
$col_name = 'question';
break;
default:
result_output('I003', null, 'Unsupported question type', true);
}
try { // query with transaction
$transaction = $DB->start_delegated_transaction();
$DB->update_record('question', ['id' => (int) $_REQUEST['qid'], 'qtype' => $new_type]);
$old_record = $DB->get_record($old_table, [$col_name => (int) $_REQUEST['qid']]);
if ($old_record === false) throw new Exception('Retrieve old record failed.');
unset($old_record->id); // throw away original auto increment ID
$DB->insert_record($new_table, $old_record); // insert into new table
$DB->delete_records($old_table, [$col_name => (int) $_REQUEST['qid']]); // remove from old table
$transaction->allow_commit();
} catch(Exception $e) {
$transaction->rollback($e);
result_output('I002', null, 'Database execution error: ' . $e, true);
}
result_output('0', null, 'OK');
} else {
result_output('R002', null, 'Bad request', true, 400);
}
}
function getAnswers() {
global $DB;
if (isset($_REQUEST['qid']) && is_numeric($_REQUEST['qid'])) {
try {
$answers = $DB->get_records('question_answers', ['question' => (int) $_REQUEST['qid']], '', '*', 0, 4);
if (count($answers) <= 0) result_output('I001', null, 'Question not exists', true);
$ret = [];
foreach ($answers as $aid => $answer) {
$ret[] = [
'aid' => $answer->id,
'text' => strip_tags(str_ireplace(['</p><p>', '<p>', '</p>', '<br />', '<br>'], [PHP_EOL, null, null, PHP_EOL, PHP_EOL], $answer->answer)),
'correct' => (float) $answer->fraction > 0
];
}
result_output('0', $ret, 'OK');
} catch(Exception $e) {
result_output('I002', null, 'Database execution error: ' . $e, true);
}
}
}
function updateAnswers() {
global $DB;
$fields = [];
for ($i = 0; $i < 4; $i++) {
if (isset($_REQUEST['ans' . $i . '-text'], $_REQUEST['ans' . $i . '-correct'], $_REQUEST['ans' . $i . '-aid']) && is_numeric($_REQUEST['ans' . $i . '-aid'])) {
$fields[] = [
'aid' => (int) $_REQUEST['ans' . $i . '-aid'],
'text' => empty(trim($_REQUEST['ans' . $i . '-text'])) ? '' : $_REQUEST['ans' . $i . '-text'],
'correct' => $_REQUEST['ans' . $i . '-correct'] == 'true'
];
}
}
try { // query with transaction
$transaction = $DB->start_delegated_transaction();
for ($i = 0; $i < count($fields); $i++) {
$DB->update_record('question_answers', ['id' => $fields[$i]['aid'], 'answer' => $fields[$i]['text'], 'fraction' => $fields[$i]['correct'] ? '1.0000000' : '0.0000000']);
}
$transaction->allow_commit();
} catch(Exception $e) {
$transaction->rollback($e);
result_output('I002', null, 'Database execution error: ' . $e, true);
}
}
function addQuestion() {
global $DB;
global $USER;
$check_arr = [
'cat-id',
'ques-name',
'ques-text',
'ques-fback',
'ques-beep',
'ans0-text',
'ans0-correct',
'ans1-text',
'ans1-correct',
'ans2-text',
'ans2-correct',
'ans3-text',
'ans3-correct'
];
for ($i = 0; $i < count($check_arr); $i++) {
if (!isset($_REQUEST[$check_arr[$i]])) result_output('R002', null, 'Bad request', true, 400);
}
if (empty($_REQUEST['ques-name'])) result_output('R003', null, 'You must enter the question name.', true);
$is_beep = $_REQUEST['ques-beep'] == 'true';
$ins_question = new stdClass();
$ins_question->category = (int) $_REQUEST['cat-id'];
$ins_question->parent = 0;
$ins_question->name = htmlspecialchars($_REQUEST['ques-name']);
$ins_question->questiontext = htmlspecialchars(str_ireplace([PHP_EOL], ['<br />'], $_REQUEST['ques-text']));
$ins_question->questiontextformat = 1;
$ins_question->generalfeedback = htmlspecialchars(str_ireplace([PHP_EOL], ['<br />'], $_REQUEST['ques-fback']));
$ins_question->generalfeedbackformat = 1;
$ins_question->qtype = $is_beep ? 'beepmulchoice' : 'multichoice';
$ins_question->stamp = make_unique_id_code();
$ins_question->version = make_unique_id_code();
$ins_question->timecreated = time();
$ins_question->timemodified = $ins_question->timecreated;
$ins_question->createdby = $USER->id;
$ins_question->modifiedby = $USER->id;
try { // query with transaction
$transaction = $DB->start_delegated_transaction();
$qid = $DB->insert_record('question', $ins_question, true); // add question to table
unset($ins_question);
$opt_question = new stdClass();
$opt_question->questionid = $qid;
$opt_question->single = 1;
$opt_question->shuffleanswers = 1;
$opt_question->correctfeedback = 'Your answer is correct.';
$opt_question->correctfeedbackformat = 1;
$opt_question->partiallycorrectfeedback = 'Your answer is partially correct.';
$opt_question->partiallycorrectfeedbackformat = 1;
$opt_question->incorrectfeedback = 'Your answer is incorrect.';
$opt_question->shownumcorrect = 1;
$DB->insert_record($is_beep ? 'qtype_beepmulchoice_options' : 'qtype_multichoice_options', $opt_question); // specify question options
unset($opt_question);
$ans_count = 0;
for ($i = 0; $i < 4; $i++) {
if (empty($_REQUEST["ans{$i}-text"])) continue; // skip empty answer
$ans_count++;
$answer = new stdClass();
$answer->question = $qid;
$answer->answer = htmlspecialchars(str_ireplace([PHP_EOL], ['<br />'], $_REQUEST["ans{$i}-text"]));
$answer->answerformat = 1;
$answer->fraction = $_REQUEST["ans{$i}-correct"] == 'true' ? '1.0000000' : '0.0000000';
$answer->feedback = '';
$answer->feedbackformat = 1;
if (!isset($aid)) {
$aid = $DB->insert_record('question_answers', $answer, true);
} else {
$DB->insert_record('question_answers', $answer, true); // insert answers
}
}
if ($ans_count < 1) result_output('R003', null, 'You must enter at least one answer.', true);
else $transaction->allow_commit();
} catch(Exception $e) {
$transaction->rollback($e);
result_output('I002', null, 'Database execution error: ' . $e, true);
}
result_output('0', ['id' => $qid, 'aid' => isset($aid) ? $aid : -1], 'OK');
}
function createCat() {
global $DB;
if (empty($_REQUEST['name']) || empty($_REQUEST['cid']) || !is_numeric($_REQUEST['cid'])) result_output('R002', null, 'Bad request', true, 400);
$record = new stdClass();
$record->name = htmlspecialchars($_REQUEST['name']);
$record->info = htmlspecialchars($_REQUEST['info']);
$record->infoformat = 0;
$record->contextid = (int) $_REQUEST['cid'];
$record->stamp = make_unique_id_code();
$record->parent = 0;
$record->sortorder = 999;
try {
$insert_id = $DB->insert_record('question_categories', $record, true);
if (!is_numeric($insert_id)) throw new Exception('Insert to database failed.');
result_output('0', ['id' => $insert_id], 'OK');
} catch(Exception $e) {
result_output('I004', null, 'Execution error: ' . $e, true);
}
}
function bulkExec() {
global $DB;
if (empty($_REQUEST['method']) || empty($_REQUEST['ids']) || empty($_REQUEST['scope']) || !in_array($_REQUEST['scope'], ['cat', 'question'])) result_output('R002', null, 'Bad request', true, 400);
if (substr($_REQUEST['method'], 0, 4) == 'cat-') {
preg_match("/^cat-\d+$/", $_REQUEST['method'], $matches);
if (!isset($matches[0])) result_output('R002', null, 'Bad request', true, 400);
else $matches[0] = str_ireplace('cat-', null, $matches[0]);
if (!is_numeric($matches[0])) result_output('R002', null, 'Bad request', true, 400);
else {
$cat_id = $matches[0];
$_REQUEST['method'] = 'movecat';
}
}
$targets = explode(',', $_REQUEST['ids']);
try {
$transaction = $DB->start_delegated_transaction();
switch (strtolower($_REQUEST['method'])) {
case 'del':
for ($i = 0; $i < count($targets); $i++) {
if (!is_numeric($targets[$i])) continue;
if ($_REQUEST['scope'] == 'cat') {
$DB->delete_records('question_categories', ['id' => $targets[$i]]); // delete category
$DB->delete_records('question', ['category' => $targets[$i]]); // delete corresponding questions
} elseif ($_REQUEST['scope'] == 'question') {
$DB->delete_records('question', ['id' => $targets[$i]]);
$DB->delete_records('qtype_multichoice_options', ['questionid' => $targets[$i]]);
$DB->delete_records('qtype_beepmulchoice_options', ['questionid' => $targets[$i]]);
}
}
break;
case 'movecat':
for ($i = 0; $i < count($targets); $i++) {
$question = new stdClass();
$question->id = (int) $targets[$i];
$question->category = (int) $cat_id;
$DB->update_record('question', $question);
}
break;
case 'fixfback':
if ($_REQUEST['scope'] == 'cat') {
$total = 0;
for ($i = 0; $i < count($targets); $i++) {
$total += fixCatFeedback($targets[$i]);
}
result_output('0', ['total' => $total], 'OK');
} else result_output('R002', null, 'Bad request', true, 400);
break;
case 'beep':
for ($i = 0; $i < count($targets); $i++) {
$question = $DB->get_records('question', ['id' => $targets[$i]]);
if (count($question) == 1) $question = $question[$targets[$i]];
else continue;
$question->qtype = strtolower($question->qtype);
switch ($question->qtype) {
case 'multichoice':
$old_type = $question->qtype;
$new_type = 'beepmulchoice';
$old_table = 'qtype_multichoice_options';
$new_table = 'qtype_beepmulchoice_options';
$col_name = 'questionid';
break;
case 'beepmulchoice':
$old_type = $question->qtype;
$new_type = 'multichoice';
$old_table = 'qtype_beepmulchoice_options';
$new_table = 'qtype_multichoice_options';
$col_name = 'questionid';
break;
case 'truefalse':
case 'beeptruefalse':
$old_type = $question->qtype;
$new_type = substr($old_type, 0, 4) == 'beep' ? substr($old_type, 4) : ('beep' . $old_type);
$old_table = 'question_' . $old_type;
$new_table = 'question_' . $new_type;
$col_name = 'question';
break;
default:
result_output('I003', null, 'Unsupported question type', true);
}
$DB->update_record('question', ['id' => $targets[$i], 'qtype' => $new_type]);
$old_record = $DB->get_record($old_table, [$col_name => $targets[$i]]);
if ($old_record === false) throw new Exception('Retrieve old record failed.');
unset($old_record->id); // throw away original auto increment ID
$DB->insert_record($new_table, $old_record); // insert into new table
$DB->delete_records($old_table, [$col_name => $targets[$i]]); // remove from old table
}
break;
default:
result_output('R002', null, 'Bad request', true, 400);
}
$transaction->allow_commit();
result_output('0', ['reload' => true], 'OK');
} catch(Exception $e) {
$transaction->rollback($e);
result_output('I004', null, 'Execution error: ' . $e, true);
}
}
function fixCatFeedback($cat = null) {
global $DB, $CFG;
if (is_null($cat)) {
if (empty($_REQUEST['cid']) || !is_numeric($_REQUEST['cid']) || (int) $_REQUEST['cid'] < 1) result_output('R002', null, 'Bad request', true, 400);
$cid = (int) $_REQUEST['cid'];
} else {
$cid = (int) $cat;
}
try {
$transaction = $DB->start_delegated_transaction();
$questions = $DB->get_records('question', ['category' => $cid, 'qtype' => 'beepmulchoice']);
$table_prefix = $CFG->prefix;
foreach ($questions as $qid => $qobj) {
$query = <<<SQL
INSERT INTO `{$table_prefix}qtype_beepmulchoice_options`
(questionid, single, correctfeedback, correctfeedbackformat, partiallycorrectfeedback, partiallycorrectfeedbackformat, incorrectfeedback, incorrectfeedbackformat, shownumcorrect)
VALUES (
{$qid},
'1',
'Your answer is correct.',
'1',
'Your answer is partially correct.',
'1',
'Your answer is incorrect.',
'1',
'1'
)
ON DUPLICATE KEY UPDATE
`correctfeedback` = 'Your answer is correct.',
`correctfeedbackformat` = '1',
`partiallycorrectfeedback` = 'Your answer is partially correct.',
`partiallycorrectfeedbackformat` = '1',
`incorrectfeedback` = 'Your answer is incorrect.',
`incorrectfeedbackformat` = '1',
`shownumcorrect` = '1'
SQL;
$result = $DB->execute($query);
}
$transaction->allow_commit();
if (is_null($cat)) result_output('0', ['total' => count($questions)], 'OK');
else return count($questions);
} catch(Exception $e) {
$transaction->rollback($e);
result_output('I004', null, 'Execution error: ' . $e, true);
}
}
function pingpong() {
result_output('0', null, 'OK');
}
function result_output($code, $data = null, $msg = null, $onerror = false, $http_code = 200) {
$json = [
'code' => $code,
'onerror' => $onerror
];
if (!is_null($data)) $json['data'] = $data;
if (!is_null($msg)) $json['msg'] = $msg;
header('Content-Type: application/json');
http_response_code($http_code);
echo json_encode($json);
exit;
}
?>