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< ? php
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session_start ();
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define ( 'IDENTITIES_FILE' , 'identities.json' );
define ( 'PRESENT_FILE' , 'present.json' );
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define ( 'NAME_PATTERN' , " ^([ a-zA-Z' \ -]) { 1,30} $ " );
define ( 'MAC_PATTERN' , " ^([0-9A-Fa-f] { 2}[:-s]) { 5}([0-9A-Fa-f] { 2}) $ " );
define ( 'PAGE_TITLE' , 'CZI Presence Detector' );
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$present = json_decode ( file_get_contents ( PRESENT_FILE ), true );
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$tz = 'Europe/Berlin' ;
$datetime = new DateTime ( " now " , new DateTimeZone ( $tz ));
$datetime -> setTimestamp ( $present [ " timestamp " ]);
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function hash_mac ( $mac )
{
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$normalized_mac = str_replace ( '-' , ':' , strtolower ( $mac ));
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$hashed_mac = hash ( 'sha256' , $normalized_mac );
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return $hashed_mac ;
}
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function add_identity ( $name , $mac )
{
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if (
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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 ) {
$_SESSION [ 'form_success' ] = false ;
$_SESSION [ 'form_success_message' ] = 'Name already in use, please choose a different one.' ;
header ( " Location: " . $url , true , 303 );
exit ();
}
if ( $identity [ 'mac_hash' ] == $hashed_mac ) {
$_SESSION [ 'form_success' ] = false ;
$_SESSION [ 'form_success_message' ] = 'MAC already set up, please remove it first to change name.' ;
header ( " Location: " . $url , true , 303 );
exit ();
}
}
array_push ( $identities , array ( " name " => $name , " mac_hash " => $hashed_mac ));
file_put_contents ( IDENTITIES_FILE , json_encode ( $identities ));
$_SESSION [ 'form_success' ] = true ;
$_SESSION [ 'form_success_message' ] = 'Identity successfully saved.' ;
header ( " Location: " . $url , true , 303 );
exit ();
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}
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function remove_identity ( $mac )
{
if ( preg_match ( '/' . MAC_PATTERN . '/' , $mac ) != 1 ) {
http_response_code ( 400 );
die ( " Bad data " );
}
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$hashed_mac = hash_mac ( $mac );
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$identities = json_decode ( file_get_contents ( IDENTITIES_FILE ), true );
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$new_identities = array ();
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foreach ( $identities as $identity ) {
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if ( $identity [ 'mac_hash' ] != $hashed_mac ) {
array_push ( $new_identities , $identity );
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}
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file_put_contents ( IDENTITIES_FILE , json_encode ( $new_identities ));
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$_SESSION [ 'form_success' ] = true ;
$_SESSION [ 'form_success_message' ] = 'Identity successfully removed.' ;
header ( " Location: " . strtok ( $_SERVER [ 'REQUEST_URI' ], '?' ), true , 303 );
exit ();
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}
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}
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if ( $_SERVER [ 'REQUEST_METHOD' ] == " POST " ) {
if (
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isset ( $_POST [ 'name' ]) &&
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isset ( $_POST [ 'mac' ])
) {
add_identity ( $_POST [ 'name' ], $_POST [ 'mac' ]);
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} else if ( isset ( $_POST [ 'remove-mac' ])) {
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remove_identity ( $_POST [ 'remove-mac' ]);
}
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}
?>
< html >
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< 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 >
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< nav class = " navbar navbar-light bg-light justify-content-between " style = " padding: 0 " >
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< span class = " navbar-brand mb-0 h1 " style = " padding-left: 1rem " >< ? php echo PAGE_TITLE ; ?> </span>
</ nav >
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< 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 >
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</ tr >
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</ thead >
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< ? php
foreach ( $present [ " names " ] as $name ) {
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?>
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< tr >
< td >< ? php echo $name ; ?> </td>
</ tr >
< ? php
}
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?>
</ table >
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< br >< br >
< ? php
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if ( isset ( $_SESSION [ 'form_success' ])) {
if ( $_SESSION [ 'form_success' ] === false ) {
?>
< div class = " alert alert-danger " role = " alert " >
< ? php echo $_SESSION [ 'form_success_message' ]; ?>
</ div >
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< ? php
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} else if ( $_SESSION [ 'form_success' ] === true ) {
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?>
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< div class = " alert alert-success " role = " alert " >
< ? php echo $_SESSION [ 'form_success_message' ]; ?>
</ div >
< ? php
}
unset ( $_SESSION [ 'form_success' ]);
unset ( $_SESSION [ 'form_success_message' ]);
} ?>
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< div class = " row justify-content-start row-cols-sm-1 row-cols-md-1 row-cols-lg-2 row-cols-xl-3 " >
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< 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 " >
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< input class = " form-control " type = " text " name = " name " pattern = " <?php echo NAME_PATTERN; ?> " placeholder = " Name des zu trackenden Geräts " value = " " />< br >
< input class = " form-control " type = " text " name = " mac " pattern = " <?php echo MAC_PATTERN; ?> " placeholder = " MAC-Adresse des zu trackenden Geräts " value = " " />< br >
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< 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 " >
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< input class = " form-control " type = " text " name = " remove-mac " pattern = " <?php echo MAC_PATTERN; ?> " placeholder = " MAC-Adresse des zu löschenden Geräts " value = " " />< br >
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< button class = " btn btn-primary " type = " submit " > Entfernen </ button >
</ form >
</ div >
</ div >
</ div >
</ div >
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</ div >
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</ body >
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</ html >
