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<?php
$db = new SQLite3('../backstage/computer-time-limit/computer-time-limit.sqlite');
function log_to_file($line) {
$handle = fopen('../backstage/computer-time-limit/log', 'a');
fwrite($handle, time() . ' ' . $line . "\n");
fclose($handle);
}
if (array_key_exists('msg', $_POST) && array_key_exists('sig', $_POST)) {
$sig_file = tempnam('/tmp', 'ctl-sig');
$h = fopen($sig_file, 'w');
fwrite($h, base64_decode($_POST['sig']) . "\n");
fclose($h);
$msg_file = tempnam('/tmp', 'ctl-msg');
$h = fopen($msg_file, 'w');
fwrite($h, $_POST['msg'] . "\n");
fclose($h);
$key = trim(shell_exec('sed -n "1 s@^.* \([a-zA-Z]\+\)\.pub\$@\1@; T; p" ' . $sig_file));
$erg = shell_exec('signify -V -p ../backstage/computer-time-limit/keys/' . $key . '.pub -x ' . $sig_file . ' -m ' . $msg_file . ' 2>&1; echo $?');
if ($erg != 'Signature Verified' . "\n" . '0' . "\n") {
print($erg);
die();
}
unlink($sig_file);
unlink($msg_file);
$result = $db->query('SELECT * FROM `computer_time` WHERE `name`="' . $key . '"');
$row = $result->fetchArray();
if (!$row) {
print($key . ' is not known.');
die();
}
$aktiv = $row['aktiv'];
$bis = strtotime($row['bis']);
$von = strtotime($row['von']);
log_to_file('from_db ' . $key . ' ' . $_POST['msg'] . ' ' . $aktiv . ' ' . $von . ' ' . $bis);
if ($bis < $von) {
$aktiv = 0;
$bis = $von;
}
$bis = $bis + 30*60*(floor(time()/60/60/24) - floor($von/60/60/24));
if ($aktiv) {
$von = time();
}
$noch = $bis - $von;
if ($noch < 0) {
$noch = 0;
}
if ($noch > 4*60*60) {
$noch = 4*60*60;
}
print($noch . "\n");
switch ($_POST['msg']) {
case 'start':
$aktiv = 1;
break;
;;
case 'stop':
$aktiv = 0;
break;
;;
default:
print($_POST['msg'] . ' unknown');
die();
;;
}
if ($noch == 0) {
$aktiv = 0;
}
log_to_file('to_db ' . $key . ' ' . $aktiv . ' ' . $von . ' ' . $bis);
$db -> exec(
'UPDATE `computer_time`' .
' SET `aktiv`=' . $aktiv . ',' .
'`von`="' . date('Y-m-d H:i:s', time()) . '",' .
'`bis`="' . date('Y-m-d H:i:s', time() + $noch) . '"' .
' WHERE `name`="' . $key . '"');
die();
}
$result = $db->query('select * from `computer_time`');
?><html><body><table>
<?php
while ($row = $result->fetchArray()) {
$bis = strtotime($row['bis']);
$von = strtotime($row['von']);
if ($row['aktiv']) {
$von = time();
}
$noch = $bis - $von;
?> <tr><td><?php print($row['name']); ?></td><td><?php
print(date('Y-m-d H:i:s', $bis));
print(' (');
print($noch);
print(')');
?></td><td><?php
if ($row['aktiv']) {
print('eingeloggt');
} else {
print(' ');
}
?></td></tr>
<?php
}
?></table></body></html>
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