<?PHP
###############################################################
#                                                             #
# Community Applications copyright 2015-2021, Andrew Zawadzki #
#                   Licenced under GPLv2                      #
#                                                             #
###############################################################
$docroot = $docroot ?? $_SERVER['DOCUMENT_ROOT'] ?: "/usr/local/emhttp";

require_once "$docroot/plugins/dynamix.docker.manager/include/DockerClient.php";
require_once "$docroot/plugins/dynamix.plugin.manager/include/PluginHelpers.php";
require_once "$docroot/plugins/dynamix/include/Wrappers.php";
require_once "$docroot/plugins/community.applications/include/helpers.php";

$paths['notices_remote'] = "https://raw.githubusercontent.com/Squidly271/CA_notifications/master/CA_notices.json";
$paths['CA_root']        = "/tmp/ca_notices";
$paths['notices']        = "{$paths['CA_root']}/CA_notices.json";
$paths['bannerNotices']  = "{$paths['CA_root']}/notices";
$paths['local']          = "/tmp/GitHub/CA_notifications/CA_notices.json";  // only used when run from the command line for debugging
$paths['dismiss']        = "/boot/config/plugins/community.applications/notifications_dismissed.json";

$cfg = parse_plugin_cfg("community.applications");

if ( $cfg['notifications'] == "no" ) {
	echo json_encode([]);
	exit();
}

exec("mkdir -p {$paths['CA_root']}");

$local = false;  // ONLY SET TO TRUE FOR DEBUGGING.  MUST BE FALSE FOR RELEASES

$action = $_POST['action'];
// check if started from command prompt or gui
if ( ! $action ){
	$debugging = true;
	$sendNotification = true;
	$action = 'scan';
}

if ( is_file("/var/run/dockerd.pid") && is_dir("/proc/".@file_get_contents("/var/run/dockerd.pid")) ) {
	$dockerRunning = true;
	$DockerClient = new DockerClient();
} else
	$dockerRunning = false;

function debug($message) {
	global $debugging;

	if ($debugging) echo $message;
}

function conditionsMet($value) {
	global $conditionsMet;

	if ($value)
		debug("  Passed\n");
	else {
		$conditionsMet = false;
		debug("  Failed\n");
	}
}

############## MAIN ##############
switch ($action) {
	case 'scan':
		if ( $local ) {
			$notices = readJsonFile($paths['local']);
			copy($paths['local'],$paths['notices']);
		} else {
			if ( is_file($paths['notices']) && ( time() - filemtime($paths['notices']) < 604800 ) ) {
				// Only send one notification per week
				$notices = readJsonFile($paths['notices']);
				$sendNotification = false;
			} else {
//				exec("logger downloading new notifications");
				$notices = download_json($paths['notices_remote'],$paths['notices']);
			}
		}

		if ( $local && ! is_array($notices) ) {
			debug("Not a valid local json file");
			return;
		}

		if ( ! is_array($notices) ) $notices = array();
		$dismissed = readJsonFile($paths['dismiss']);
		foreach ( $notices as $app => $notice ) {
			if ( in_array($notice['ID'],$dismissed) )
				continue;

			debug("Searching for $app");
			$found = false;

			$plugin = ( startsWith($app,"https://") || strtolower(pathinfo($app,PATHINFO_EXTENSION)) == "plg");

			if ( ! $plugin && $dockerRunning) {
				$info = $DockerClient->getDockerContainers();
				$search = explode(":",$app);
				if ( ! $search[1] )
					$app .= ":latest";
				
				foreach($info as $container) {
					if ( $search[1] == "*" ) {
						if ( explode(":",$container['Image'])[0] == $search[0])
							$found = true;
							break;
					}
					if ($container['Image'] == $app) {
						$found = true;
						break;
					}
				}
			} else {
				if ( is_file("/var/log/plugins/".basename($app)) ) {
					if ( startswith($app,"https:") ) {
						if ( plugin("pluginURL","/var/log/plugins/".basename($app)) == $app) {
							$found = true;
						}
					} else
						$found = true;
				}
			}
			if ( $found ) {
				debug("   Found  Looking for conditions\n");
				$conditionsMet = true;
				if ( $notice['Conditions']['unraid'] ) {
					$unraid = parse_ini_file("/etc/unraid-version");
					$unraidVersion = $unraid['version'];
					foreach ($notice['Conditions']['unraid'] as $condition) {
						if ( ! $conditionsMet ) break;
						debug("Testing unraid version $unraidVersion {$condition[0]} {$condition[1]}");
						conditionsMet(version_compare($unraidVersion,$condition[1],$condition[0]));
					}
				}
			} else {
				debug("  Not Found");
				continue;
			}

			if ( $plugin && $notice['Conditions']['plugin'] ) {
				$pluginVersion = @plugin("version","/var/log/plugins/".basename($app));
				if ( ! $pluginVersion ) {
					debug("Unable to determine plugin version.  Carrying on");
					continue;
				}
				foreach ($notice['Conditions']['plugin'] as $condition) {
					if ( ! $conditionsMet ) break;
					debug("Testing plugin version $pluginVersion {$condition[0]} {$condition[1]}");
					$cmp = strcmp($pluginVersion,$condition[1]);
		// do some operator substitutions
					switch($condition[0]) {
						case "=":
							$condition[0] = "==";
							break;
						case "eq":
							$condition[0] = "==";
							break;
						case "=<":
							$condition[0] = "<=";
							break;
						case "le":
							$condition[0] = "<=";
							break;
						case "lt":
							$condition[0] = "<";
							break;
						case ">=":
							$condition[0] = ">=";
							break;
						case "ge":
							$condition[0] = ">=";
							break;
						case "gt":
							$condition[0] = ">";
						case "ne":
							$condition[0] = "!";
							break;
						case "<>":
							$condition[0] = "!";
							break;
						case "!=":
							$condition[0] = "!";
							break;
					}

					switch ($condition[0]) {
						case "<":
							conditionsMet($cmp < 0);
							break;
						case ">":
							conditionsMet($cmp > 0);
							break;
						case "==":
							conditionsMet($cmp == 0);
							break;
						case "<=":
							conditionsMet($cmp < 1);
							break;
						case "=>":
							conditionsMet($cmp > -1);
							break;
						case "!":
							conditionsMet($cmp != 0);
							break;
					}
				}
			}

			if ( $notice['Conditions']['code'] && $conditionsMet) {
				debug("Executing {$notice['Conditions']['code']}");
				conditionsMet(eval($notice['Conditions']['code']));
			}

			if ($conditionsMet) {
				debug("Conditions Met.  Send the notification!\n");
				if ( $sendNotification ) {
					$command = "/usr/local/emhttp/plugins/dynamix/scripts/notify -b -e 'Community Applications Background Scanning' -s 'Attention Required' -d ".escapeshellarg($notice['email']."  Login to your server for more detail.  To not receive this notification again, dismiss the banner when logged into your server")." -i 'warning'";
					exec($command);
				}
				$notice['App'] = $app;
				$unRaidNotifications[] = $notice;
			} else {
				debug("Conditions not met.  Do nothing!\n");
			}
			debug("\n");
		}
		echo json_encode($unRaidNotifications ?: [],JSON_UNESCAPED_SLASHES | JSON_PRETTY_PRINT);
		break;
	case 'dismiss':
		$notifications = readJsonFile($paths['dismiss']);
		$notifications[] = $_POST['ID'];
		writeJsonFile($paths['dismiss'],$notifications);
		break;
}
?>