<?php
define('IDENTITIES_FILE', 'identities.json');
define('PRESENT_FILE', 'present.json');
$page_title = 'CZI Presence Detector';
$name_pattern = "^([ a-zA-Z'\-]){1,30}$";
$mac_pattern = "^([0-9A-Fa-f]{2}[:-s]){5}([0-9A-Fa-f]{2})$";
$present = json_decode(file_get_contents(PRESENT_FILE), true);
$tz = 'Europe/Berlin';
$datetime = new DateTime("now", new DateTimeZone($tz));
$datetime->setTimestamp($present["timestamp"]);
function hash_mac($mac) {
$normalized_mac = str_replace('-', ':', strtolower($mac));
$hashed_mac = hash('sha256', $normalized_mac);
return $hashed_mac;
}
function add_identity($name, $mac) {
if (
preg_match('/' . $name_pattern . '/', $name) != 1 ||
preg_match('/' . $mac_pattern . '/', $mac) != 1
) {
http_response_code(400);
die("Bad data");
}
$hashed_mac = hash_mac($mac);
$identities = json_decode(file_get_contents(IDENTITIES_FILE), true);
$url = strtok($_SERVER['REQUEST_URI'], '?');
foreach ($identities as $identity) {
if ($identity['name'] == $name) {
header("Location: " . $url . "?dup_name", true, 303);
exit();
}
if ($identity['mac_hash'] == $hashed_mac) {
header("Location: " . $url . "?dup_mac", true, 303);
exit();
}
}
array_push($identities, array("name" => $name, "mac_hash" => $hashed_mac));
file_put_contents(IDENTITIES_FILE, json_encode($identities));
header("Location: " . $url . "?succ", true, 303);
exit();
}
function remove_identity($mac) {
if (preg_match('/' . $mac_pattern . '/', $mac) != 1) {
http_response_code(400);
die("Bad data");
}
$hashed_mac = hash_mac($mac);
$identities = json_decode(file_get_contents(IDENTITIES_FILE), true);
$new_identities = array();
foreach ($identities as $identity) {
if ($identity['mac_hash'] != $hashed_mac) {
array_push($new_identities, $identity);
}
file_put_contents(IDENTITIES_FILE, json_encode($new_identities));
header("Location: " . strtok($_SERVER['REQUEST_URI'], '?'), true, 303);
exit();
}
}
if ($_SERVER['REQUEST_METHOD'] == "POST") {
if (
isset($_POST['name']) &&
isset($_POST['mac'])
) {
add_identity($_POST['name'], $_POST['mac']);
}
else if (isset($_POST['remove-mac'])) {
remove_identity($_POST['remove-mac']);
}
}
?>
<html>
<head>
<title><?php echo $page_title; ?></title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link href="bootstrap/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-4bw+/aepP/YC94hEpVNVgiZdgIC5+VKNBQNGCHeKRQN+PtmoHDEXuppvnDJzQIu9" crossorigin="anonymous">
<script src="bootstrap/js/bootstrap.bundle.min.js" integrity="sha384-HwwvtgBNo3bZJJLYd8oVXjrBZt8cqVSpeBNS5n7C8IVInixGAoxmnlMuBnhbgrkm" crossorigin="anonymous"></script>
</head>
<body>
<nav class="navbar navbar-light bg-light justify-content-between" style="padding: 0">
<span class="navbar-brand mb-0 h1" style="padding-left: 1rem"><?php echo $page_title; ?></span>
</nav>
<div id="content" style="padding: 2rem;">
<h2>Jetzt gerade im CZI <small>(letztes Update von <?php echo $datetime->format('H:i:s d.m.Y'); ?>)</small></h2><br>
<table class="table">
<thead>
<tr>
<th>Name</th>
</tr>
</thead>
<?php
foreach ($present["names"] as $name) {
?>
<tr>
<td><?php echo $name; ?></td>
</tr>
<?php
}
?>
</table>
<br><br>
<?php
if ($_SERVER['QUERY_STRING'] == 'dup_name') {
?>
<div class="alert alert-danger" role="alert">
Name already in use, please choose a different one.
</div>
<?php
} else if ($_SERVER['QUERY_STRING'] == 'dup_mac') {
?>
<div class="alert alert-danger" role="alert">
MAC already set up, please remove it first to change name.
</div>
<?php
} else if ($_SERVER['QUERY_STRING'] == 'succ') {
?>
<div class="alert alert-success" role="alert">
Identity successfully saved.
</div>
<?php
}?>
<div class="row justify-content-start">
<div class="col col-md-4">
<div class="card" style="max-width: 30rem;">
<div class="card-body">
<h5 class="card-title">Neues Gerät tracken</h5>
<form method="POST">
<input class="form-control" type="text" name="name" pattern="<?php print($name_pattern); ?>" placeholder="Gebe hier deinen Namen ein" value="" /><br>
<input class="form-control" type="text" name="mac" pattern="<?php print($mac_pattern); ?>" placeholder="Gebe hier die MAC-Adresse des zu trackenden Gerätes ein" value="" /><br>
<button class="btn btn-primary" type="submit">Speichern</button>
</form>
</div>
</div>
</div>
<div class="col col-md-4">
<div class="card" style="max-width: 30rem;">
<div class="card-body">
<h5 class="card-title">Gerät entfernen</h5>
<form method="POST">
<input class="form-control" type="text" name="remove-mac" pattern="<?php print($mac_pattern); ?>" placeholder="Gebe hier die MAC-Adresse des zu löschenden Gerätes ein" value="" /><br>
<button class="btn btn-primary" type="submit">Entfernen</button>
</form>
</div>
</div>
</div>
</div>
</div>
</body>
</html>