Raumstatus/room.php

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<?php

# API Key
$API_KEY = "APIKEY";

# room status file
$ROOM_STATUS_FILE = "/var/www/room_status.txt";

# timeout in minutes when to mark room closed (after last "open message")
$ROOM_TIMEOUT = 20;

# lower people limit for status "open"
$PEOPLE_LIMIT = 3;

# lower people limit for status "open" on fridays after 19.00
$PEOPLE_LIMIT_FR = 1;

# FUNCTIONS
function isHttps() {
        return ($_SERVER["HTTPS"] != "");
}

function isAuthd($apikey) {
        global $API_KEY;
        return ($apikey == $API_KEY);
}

function determineStatus($openTime, $people) {
        global $ROOM_TIMEOUT, $PEOPLE_LIMIT, $PEOPLE_LIMIT_FR;

        $open = ($openTime > (time() - $ROOM_TIMEOUT*60));

        # on friday evenings, use special rule
        $fridayNights = ( date("N", $openTime) == 5 && date("G", $openTime) >= 18 ) || ( date("N", $openTime) == 6 && date("G", $openTime) <= 3 );
        $enoughPeople = ( ($fridayNights && $PEOPLE_LIMIT_FR) || $people >= $PEOPLE_LIMIT);
        return ($open && $enoughPeople);
}

function getStatus() {
        global $ROOM_STATUS_FILE, $ROOM_TIMEOUT;

        # GET REQUEST - Get status
        $fp = fopen($ROOM_STATUS_FILE, "r");
        $lastOpenSignal = intval(fgets($fp));
        $lastStatusSignal = intval(fgets($fp));
        $people = intval(fgets($fp));
        fclose($fp);

        if (determineStatus($lastOpenSignal, $people)) {
                $status = "open";
                $since = $lastStatusSignal;
        } else {
                $status = "closed";
                $since = ($lastOpenSignal != 0) ? $lastOpenSignal + $ROOM_TIMEOUT*60 : $lastOpenSignal;
        }

        return array("roomStatus" => $status, "since" => $since);
}


# POST REQUEST - set Status
if (count($_POST) > 0) {

        if (!isHttps()) {
                $returnArr = array("success" => false, "reason" => "Please use SSL.");

        } else if (!isset($_POST["apikey"])) {
                $returnArr = array("success" => false, "reason" => "Please provide API key.");

        } else if (!isset($_POST["people"])) {
                $returnArr = array("success" => false, "reason" => "Please provide number of people online.");

        } else if (!isAuthd($_POST["apikey"])) {
                $returnArr = array("success" => false, "reason" => "Please provide *correct* API key.");

        } else if (determineStatus(time(), $_POST["people"])) {

                $fp = @fopen($ROOM_STATUS_FILE, "r");
                if ($fp) {
                        $lastOpenSignal = intval(fgets($fp));
                        $lastStatusSignal = intval(fgets($fp));
                        $people = intval(fgets($fp));
                        fclose($fp);
                } else {
                        $lastOpenSignal = 0;
                        $lastStatusSignal = 0;
                        $people = 0;
                }

                # status changed?
                if (determineStatus($lastOpenSignal, $people) != determineStatus(time(), $_POST["people"])) {
                        $writeContent = time()."\n".time()."\n".intval($_POST["people"]);
                } else {
                        $writeContent = time()."\n".$lastStatusSignal."\n".intval($_POST["people"]);
                }

                $fp = fopen($ROOM_STATUS_FILE, "w");
                fputs($fp, $writeContent);
                fclose($fp);

                $returnArr = array("success" => true);

        } else {
                # people limit not reached, but thx anyway
                $returnArr = array("success" => true);

        }

        echo json_encode($returnArr);

} else {

        echo json_encode(getStatus());
}
?>