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<?php
/**
* Helper functions for managing external panels,
* which are not running on bwLehrpool, but for
* example, an android app, and need additional
* callbacks to be managed by slx-admin.
*/
class ApiExternalPanels
{
private static function getBaseUrl(): string
{
$base = Util::shouldRedirectDomain();
if ($base !== null) {
$base = 'https://' . $base;
} else {
$base = ($_SERVER['HTTPS'] ? 'https' : 'http') . '://' . $_SERVER['HTTP_HOST'];
}
return $base . '/panel/';
}
/**
* @return array{server_name: string, panels: array<array{title: string, url: string}>}
*/
public static function generatePublicPanelList(): array
{
$base = self::getBaseUrl();
$result = [
'server_name' => 'To be filled by O.E.M.',
'panels' => [],
];
$res = Database::simpleQuery("SELECT paneluuid, panelname FROM locationinfo_panel WHERE ispublic = 1");
foreach ($res as $row) {
$result['panels'][] = [
'uuid' => $row['paneluuid'],
'title' => $row['panelname'],
'url' => $base . $row['paneluuid'],
];
}
return $result;
}
/**
* Register an external device with the server.
*/
public static function registerDevice(): array
{
$deviceuuid = Request::any('deviceuuid', Request::REQUIRED, 'string');
if (!Util::isValidUuid($deviceuuid)) {
http_response_code(400);
return ['error' => 'Invalid external device UUID'];
}
$paneluuid = Request::any('paneluuid', null, 'string');
$titletext = Request::any('title', '', 'string');
$ret = Database::exec("INSERT INTO locationinfo_externaldevice
(deviceuuid, paneluuid, title, registertime, registerip)
VALUES (:deviceuuid, :paneluuid, :title, UNIX_TIMESTAMP(), :ip)", [
'deviceuuid' => $deviceuuid,
'paneluuid' => $paneluuid,
'title' => $titletext,
'ip' => Util::getClientIp()
], true);
if ($ret === false) {
http_response_code(409);
return ['error' => 'Failed to register external device; device uuid already registered, or invalid paneluuid'];
}
return ['success' => 'External device registered successfully'];
}
/**
* To be called every 5 minutes by a running external device.
* We'll consider devices that didn't report in for more than 10
* minutes as offline.
* This also returns an array with configuration information to
* the device, and the app running on the device should then check
* if any of the parameters changed and react to this accordingly.
* @return array{url: string, brightness_pct: int, reboot_hour: int}
*/
public static function checkinCallback(): array
{
$row = Database::queryFirst("SELECT deviceuuid, isregistered, configjson FROM locationinfo_externaldevice
WHERE deviceuuid = :deviceuuid", ['deviceuuid' => Request::any('deviceuuid', Request::REQUIRED, 'string')]);
if ($row === false) {
http_response_code(404);
return ['error' => 'Unknown external panel uuid, please register first.'];
}
if ($row['paneluuid'] === null) {
http_response_code(202);
return ['error' => 'Your external device uuid has been submitted for registration, please wait for an Administrator to set up a configuration.'];
}
$config = json_decode($row['configjson'], true);
if (!is_array($config)) {
$config = [];
}
$config['time_ms'] = ceil(microtime(true) * 1000);
$config['url'] = self::getBaseUrl() . $row['paneluuid'];
Database::exec("UPDATE locationinfo_externaldevice SET lastseen = UNIX_TIMESTAMP() WHERE deviceuuid = :deviceuuid",
['deviceuuid' => $row['deviceuuid']]);
return $config;
}
}
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