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<?php
declare(strict_types=1);
/**
* @copyright Copyright (c) 2020 Julien Veyssier <eneiluj@posteo.net>
*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
namespace OCA\Talk;
use OCP\IConfig;
use OCP\IDBConnection;
use OCP\DB\QueryBuilder\IQueryBuilder;
use OCP\IL10N;
use OCP\IUserManager;
use OCP\Files\IAppData;
use OCP\Files\NotFoundException;
use OCP\Files\SimpleFS\ISimpleFolder;
use OCP\IURLGenerator;
use OC\Authentication\Token\IProvider as IAuthTokenProvider;
use OC\Authentication\Token\IToken;
use OCP\Security\ISecureRandom;
use OCP\IAvatarManager;
use Doctrine\DBAL\Exception\UniqueConstraintViolationException;
use Psr\Log\LoggerInterface;
use OCA\Talk\Exceptions\ImpossibleToKillException;
use OCA\Talk\Exceptions\WrongPermissionsException;
use OCA\Talk\Exceptions\ParticipantNotFoundException;
class MatterbridgeManager {
/** @var IDBConnection */
private $db;
/** @var IConfig */
private $config;
/** @var IAppData */
private $appData;
/** @var IL10N */
private $l;
/** @var IUserManager */
private $userManager;
/** @var IAuthTokenProvider */
private $tokenProvider;
/** @var ISecureRandom */
private $random;
public function __construct(IDBConnection $db,
IConfig $config,
IAppData $appData,
IURLGenerator $urlGenerator,
IUserManager $userManager,
Manager $manager,
IAuthTokenProvider $tokenProvider,
ISecureRandom $random,
IAvatarManager $avatarManager,
LoggerInterface $logger,
IL10N $l) {
$this->avatarManager = $avatarManager;
$this->db = $db;
$this->config = $config;
$this->urlGenerator = $urlGenerator;
$this->appData = $appData;
$this->userManager = $userManager;
$this->manager = $manager;
$this->tokenProvider = $tokenProvider;
$this->random = $random;
$this->logger = $logger;
$this->l = $l;
}
/**
* Get bridge information for a specific room
*
* @param Room $room the room
* @return array decoded json bridge information
*/
public function getBridgeOfRoom(Room $room): array {
return $this->getBridgeFromDb($room);
}
/**
* Get bridge process information for a specific room
*
* @param Room $room the room
* @return array process state and log
*/
public function getBridgeProcessState(Room $room): array {
$bridge = $this->getBridgeFromDb($room);
$logContent = $this->getBridgeLog($room);
$pid = $this->checkBridgeProcess($room, $bridge, false);
return [
'running' => ($pid !== 0),
'log' => $logContent
];
}
/**
* Get bridge log file content
*
* @param Room $room the room
* @return string log file content
*/
public function getBridgeLog(Room $room): string {
$outputPath = sprintf('/tmp/bridge-%s.log', $room->getToken());
$logContent = file_get_contents($outputPath);
return $logContent !== false ? $logContent : '';
}
/**
* Edit bridge information for a room
*
* @param Room $room the room
* @param bool $enabled desired state of the bridge
* @param array $parts parts of the bridge (what it connects to)
* @return array bridge state
*/
public function editBridgeOfRoom(Room $room, bool $enabled, array $parts = []): array {
$currentBridge = $this->getBridgeOfRoom($room);
$newBridge = [
'enabled' => $enabled,
'pid' => isset($currentBridge['pid']) ? $currentBridge['pid'] : 0,
'parts' => $parts,
];
// edit/update the config file
$this->editBridgeConfig($room, $newBridge);
// check state and manage the binary
$pid = $this->checkBridgeProcess($room, $newBridge);
$newBridge['pid'] = $pid;
// save config
$this->saveBridgeToDb($room, $newBridge);
$logContent = $this->getBridgeLog($room);
return [
'running' => ($pid !== 0),
'log' => $logContent
];
}
/**
* Delete bridge information for a room
*
* @param Room $room the room
* @return bool success
*/
public function deleteBridgeOfRoom(Room $room): bool {
// first potentially kill the process
$currentBridge = $this->getBridgeOfRoom($room);
$currentBridge['enabled'] = false;
$this->checkBridgeProcess($token, $currentBridge);
// then actually delete the config
$bridgeJSON = $this->config->deleteAppValue('spreed', 'bridge_' . $token);
return true;
}
/**
* Check everything bridge-related is running fine
* For each room, check mattermost process respects desired state
*/
public function checkAllBridges(): void {
// TODO call this from time to time to make sure everything is running fine
$this->manager->forAllRooms(function ($room) {
if ($room->getType() === Room::GROUP_CALL || $room->getType() === Room::PUBLIC_CALL) {
$this->checkBridge($room);
}
});
}
/**
* For one room, check mattermost process respects desired state
* @param Room $room the room
* @return int the bridge process ID
*/
public function checkBridge(Room $room): int {
$bridge = $this->getBridgeOfRoom($room);
$pid = $this->checkBridgeProcess($room, $bridge);
if ($pid !== $bridge['pid']) {
// save the new PID if necessary
$bridge['pid'] = $pid;
$this->saveBridgeToDb($room, $bridge);
}
return $pid;
}
private function getDataFolder(): ISimpleFolder {
try {
return $this->appData->getFolder('bridge');
} catch (NotFoundException $e) {
return $this->appData->newFolder('bridge');
}
}
/**
* Edit the mattermost configuration file for one room
* This method takes care of connecting the bridge to the Talk room with a bot user
*
* @param Room $room the room
*/
private function editBridgeConfig(Room $room, array $newBridge): void {
// check bot user exists and is member of the room
// add the 'local' bridge part
$newBridge = $this->addLocalPart($room, $newBridge);
// TODO adapt that to use appData
$configPath = sprintf('/tmp/bridge-%s.toml', $room->getToken());
$configContent = $this->generateConfig($room, $newBridge);
file_put_contents($configPath, $configContent);
}
/**
* Add a bridge part with bot credentials to connect to the room
*
* @param Room $room the room
* @param array $bridge bridge information
* @return array the bridge with local part added
*/
private function addLocalPart(Room $room, array $bridge): array {
$botInfo = $this->checkBotUser($room, $bridge['enabled']);
$localPart = [
'type' => 'nctalk',
'login' => $botInfo['id'],
'password' => $botInfo['password'],
'channel' => $room->getToken(),
];
array_push($bridge['parts'], $localPart);
return $bridge;
}
/**
* routine to check the Nextcloud bot user exists (and create it if not)
* and to add it in the room in necessary
* and to revoke its old app token
* and to generate a new app token (used to connect via matterbridge)
*
* @param Room $room the room
* @param bool $create whether we should generate a new app token or not
* @return array Bot user information (username and app token). token is an empty string if creation was not asked.
*/
private function checkBotUser(Room $room, bool $create): array {
$botUserId = 'bridge-bot';
// check if user exists and create it if necessary
if (!$this->userManager->userExists($botUserId)) {
$pass = md5(strval(rand()));
$this->config->setAppValue('spreed', 'bridge_bot_password', $pass);
$botUser = $this->userManager->createUser($botUserId, $pass);
// set avatar
$avatar = $this->avatarManager->getAvatar($botUserId);
$imageData = file_get_contents(\OC::$SERVERROOT . '/apps/spreed/img/bridge-bot.png');
$avatar->set($imageData);
} else {
$botUser = $this->userManager->get($botUserId);
}
// check user is member of the room
try {
$participant = $room->getParticipant($botUserId);
} catch (ParticipantNotFoundException $e) {
$room->addUsers([
'userId' => $botUserId,
'participantType' => Participant::USER,
]);
}
// delete old bot app tokens for this room
$tokenName = 'spreed_' . $room->getToken();
$tokens = $this->tokenProvider->getTokenByUser($botUserId);
foreach ($tokens as $t) {
if ($t->getName() === $tokenName) {
$this->tokenProvider->invalidateTokenById($botUserId, $t->getId());
}
}
if ($create) {
// generate app token for the bot
$appToken = $this->random->generate(72, ISecureRandom::CHAR_UPPER.ISecureRandom::CHAR_LOWER.ISecureRandom::CHAR_DIGITS);
$botPassword = $this->config->getAppValue('spreed', 'bridge_bot_password', '');
$generatedToken = $this->tokenProvider->generateToken(
$appToken,
$botUserId,
$botUserId,
$botPassword,
$tokenName,
IToken::PERMANENT_TOKEN,
IToken::REMEMBER
);
} else {
$appToken = '';
}
return [
'id' => $botUserId,
'password' => $appToken,
];
}
/**
* Actually generate the matterbridge configuration file content for one bridge (one room)
* It basically add a pair of sections for each part: authentication and target channel
*
* @param Room $room the room
* @return string config file content
*/
private function generateConfig(Room $room, array $bridge): string {
$content = '';
foreach ($bridge['parts'] as $k => $part) {
if ($part['type'] === 'nctalk') {
$content .= sprintf('[%s.%s]', $part['type'], $k) . "\n";
if (isset($part['server']) && $part['server'] !== '') {
$serverUrl = $part['server'];
} else {
$serverUrl = preg_replace('/\/+$/', '', $this->urlGenerator->getAbsoluteURL(''));
// TODO remove that
//$serverUrl = preg_replace('/https:/', 'http:', $serverUrl);
}
$content .= sprintf(' Server = "%s"', $serverUrl) . "\n";
$content .= sprintf(' Login = "%s"', $part['login']) . "\n";
$content .= sprintf(' Password = "%s"', $part['password']) . "\n";
$content .= ' PrefixMessagesWithNick = true' . "\n";
$content .= ' RemoteNickFormat="[{PROTOCOL}] <{NICK}> "' . "\n\n";
} elseif ($part['type'] === 'mattermost') {
// remove protocol from server URL
if (preg_match('/^https?:/', $part['server'])) {
$part['server'] = $this->cleanUrl($part['server']);
}
$content .= sprintf('[%s]', $part['type']) . "\n";
$content .= sprintf(' [%s.%s]', $part['type'], $k) . "\n";
$content .= sprintf(' Server = "%s"', $part['server']) . "\n";
$content .= sprintf(' Team = "%s"', $part['team']) . "\n";
$content .= sprintf(' Login = "%s"', $part['login']) . "\n";
$content .= sprintf(' Password = "%s"', $part['password']) . "\n";
$content .= ' PrefixMessagesWithNick = true' . "\n";
$content .= ' RemoteNickFormat = "[{PROTOCOL}] <{NICK}> "' . "\n\n";
} elseif ($part['type'] === 'matrix') {
$content .= sprintf('[%s.%s]', $part['type'], $k) . "\n";
$content .= sprintf(' Server = "%s"', $part['server']) . "\n";
$content .= sprintf(' Login = "%s"', $part['login']) . "\n";
$content .= sprintf(' Password = "%s"', $part['password']) . "\n";
$content .= ' PrefixMessagesWithNick = true' . "\n";
$content .= ' NoHomeServerSuffix = true' . "\n";
$content .= ' RemoteNickFormat = "[{PROTOCOL}] <{NICK}> "' . "\n\n";
} elseif ($part['type'] === 'zulip') {
$content .= sprintf('[%s.%s]', $part['type'], $k) . "\n";
$content .= sprintf(' Server = "%s"', $part['server']) . "\n";
$content .= sprintf(' Login = "%s"', $part['login']) . "\n";
$content .= sprintf(' Token = "%s"', $part['token']) . "\n";
$content .= ' PrefixMessagesWithNick = true' . "\n";
$content .= ' RemoteNickFormat = "[{PROTOCOL}] <{NICK}> "' . "\n\n";
} elseif ($part['type'] === 'rocketchat') {
// include # in channel
if (!preg_match('/^#/', $part['channel'])) {
$bridge['parts'][$k]['channel'] = '#' . $part['channel'];
}
$content .= sprintf('[%s.%s]', $part['type'], $k) . "\n";
$content .= sprintf(' Server = "%s"', $part['server']) . "\n";
$content .= sprintf(' Login = "%s"', $part['login']) . "\n";
$content .= sprintf(' Password = "%s"', $part['password']) . "\n";
$content .= ' PrefixMessagesWithNick = true' . "\n";
$content .= ' RemoteNickFormat = "[{PROTOCOL}] <{NICK}> "' . "\n\n";
} elseif ($part['type'] === 'slack') {
// do not include # in channel
if (preg_match('/^#/', $part['channel'])) {
$bridge['parts'][$k]['channel'] = preg_replace('/^#+/', '', $part['channel']);
}
$content .= sprintf('[%s.%s]', $part['type'], $k) . "\n";
$content .= sprintf(' Token = "%s"', $part['token']) . "\n";
$content .= ' PrefixMessagesWithNick = true' . "\n";
$content .= ' RemoteNickFormat = "[{PROTOCOL}] <{NICK}> "' . "\n\n";
} elseif ($part['type'] === 'discord') {
// do not include # in channel
if (preg_match('/^#/', $part['channel'])) {
$bridge['parts'][$k]['channel'] = preg_replace('/^#+/', '', $part['channel']);
}
$content .= sprintf('[%s.%s]', $part['type'], $k) . "\n";
$content .= sprintf(' Token = "%s"', $part['token']) . "\n";
$content .= sprintf(' Server = "%s"', $part['server']) . "\n";
$content .= ' PrefixMessagesWithNick = true' . "\n";
$content .= ' RemoteNickFormat = "[{PROTOCOL}] <{NICK}> "' . "\n\n";
} elseif ($part['type'] === 'telegram') {
$content .= sprintf('[%s.%s]', $part['type'], $k) . "\n";
$content .= sprintf(' Token = "%s"', $part['token']) . "\n";
$content .= ' PrefixMessagesWithNick = true' . "\n";
$content .= ' RemoteNickFormat = "[{PROTOCOL}] <{NICK}> "' . "\n\n";
} elseif ($part['type'] === 'steam') {
$content .= sprintf('[%s.%s]', $part['type'], $k) . "\n";
$content .= sprintf(' Login = "%s"', $part['login']) . "\n";
$content .= sprintf(' Password = "%s"', $part['password']) . "\n";
$content .= ' PrefixMessagesWithNick = true' . "\n";
$content .= ' RemoteNickFormat = "[{PROTOCOL}] <{NICK}> "' . "\n\n";
} elseif ($part['type'] === 'irc') {
// include # in channel
if (!preg_match('/^#/', $part['channel'])) {
$bridge['parts'][$k]['channel'] = '#' . $part['channel'];
}
$content .= sprintf('[%s.%s]', $part['type'], $k) . "\n";
$content .= sprintf(' Server = "%s"', $part['server']) . "\n";
$content .= sprintf(' Nick = "%s"', $part['nick']) . "\n";
$content .= sprintf(' Password = "%s"', $part['password']) . "\n";
$content .= ' PrefixMessagesWithNick = true' . "\n";
$content .= ' RemoteNickFormat = "[{PROTOCOL}] <{NICK}> "' . "\n\n";
} elseif ($part['type'] === 'msteams') {
$content .= sprintf('[%s.%s]', $part['type'], $k) . "\n";
$content .= sprintf(' TenantID = "%s"', $part['tenantid']) . "\n";
$content .= sprintf(' ClientID = "%s"', $part['clientid']) . "\n";
$content .= sprintf(' TeamID = "%s"', $part['teamid']) . "\n";
$content .= ' PrefixMessagesWithNick = true' . "\n";
$content .= ' RemoteNickFormat = "[{PROTOCOL}] <{NICK}> "' . "\n\n";
} elseif ($part['type'] === 'xmpp') {
$content .= sprintf('[%s.%s]', $part['type'], $k) . "\n";
$content .= sprintf(' Server = "%s"', $part['server']) . "\n";
$content .= sprintf(' Jid = "%s"', $part['jid']) . "\n";
$content .= sprintf(' Password = "%s"', $part['password']) . "\n";
$content .= sprintf(' Muc = "%s"', $part['muc']) . "\n";
$content .= sprintf(' Nick = "%s"', $part['nick']) . "\n";
$content .= ' PrefixMessagesWithNick = true' . "\n";
$content .= ' RemoteNickFormat = "[{PROTOCOL}] <{NICK}> "' . "\n\n";
}
}
$content .= '[[gateway]]' . "\n";
$content .= ' name = "myGateway"' . "\n";
$content .= ' enable = true' . "\n\n";
foreach ($bridge['parts'] as $k => $part) {
$content .= '[[gateway.inout]]' . "\n";
$content .= sprintf(' account = "%s.%s"', $part['type'], $k) . "\n";
if (in_array($part['type'], ['zulip', 'discord', 'xmpp', 'irc', 'slack', 'rocketchat', 'mattermost', 'matrix', 'nctalk'])) {
$content .= sprintf(' channel = "%s"', $part['channel']) . "\n\n";
} elseif ($part['type'] === 'msteams') {
$content .= sprintf(' threadId = "%s"', $part['threadid']) . "\n\n";
} elseif (in_array($part['type'], ['telegram', 'steam'])) {
$content .= sprintf(' chatid = "%s"', $part['chatid']) . "\n\n";
}
}
return $content;
}
/**
* Remove the scheme from an URL and add port
*/
private function cleanUrl(string $url): string {
$uo = parse_url($url);
$result = $uo['host'];
if ($uo['scheme'] === 'https' && !isset($uo['port'])) {
$result .= ':443';
} elseif (isset($uo['port'])) {
$result .= ':' . $uo['port'];
}
$result .= $uo['path'];
return $result;
}
/**
* check if a bridge process is running
*
* @param Room $room the room
* @param array $bridge bridge information
* @param $relaunch whether to launch the process if it's down but bridge is enabled
* @return int the corresponding matterbridge process ID, 0 if none
*/
private function checkBridgeProcess(Room $room, array $bridge, bool $relaunch = true): int {
$pid = 0;
if (isset($bridge['pid']) && intval($bridge['pid']) !== 0) {
// config : there is a PID stored
$isRunning = $this->isRunning($bridge['pid']);
// if bridge running and enabled is false : kill it
if ($isRunning) {
if ($bridge['enabled']) {
$this->logger->info('Process running AND bridge enabled in config : doing nothing');
$pid = $bridge['pid'];
} else {
$this->logger->info('Process running AND bridge disabled in config : KILL ' . $bridge['pid']);
$killed = $this->killPid($bridge['pid']);
if ($killed) {
$pid = 0;
} else {
$this->logger->info('Impossible to kill ' . $bridge['pid']);
throw new ImpossibleToKillException('Impossible to kill bridge process [' . $bridge['pid'] . ']');
}
}
} else {
// no process found
if ($bridge['enabled']) {
if ($relaunch) {
$this->logger->info('Process not found AND bridge enabled in config : relaunching');
$pid = $this->launchMatterbridge($room);
}
} else {
$this->logger->info('Process not found AND bridge disabled in config : doing nothing');
}
}
} elseif ($bridge['enabled']) {
if ($relaunch) {
// config : no PID stored
// config : enabled => launch it
$pid = $this->launchMatterbridge($room);
$this->logger->info('Launch process, PID is '.$pid);
}
} else {
$this->logger->info('No PID defined in config AND bridge disabled in config : doing nothing');
}
return $pid;
}
/**
* Actually launch a matterbridge process for a room
*
* @param Room $room the room
* @return int the corresponding matterbridge process ID, 0 if it failed
*/
private function launchMatterbridge(Room $room): int {
$binaryPath = $this->config->getAppValue('spreed', 'matterbridge_binary');
// TODO this should be in appdata
$configPath = sprintf('/tmp/bridge-%s.toml', $room->getToken());
$outputPath = sprintf('/tmp/bridge-%s.log', $room->getToken());
$cmd = sprintf('%s -conf %s', $binaryPath, $configPath);
$pid = exec(sprintf('%s > %s 2>&1 & echo $!', $cmd, $outputPath), $output, $ret);
$pid = intval($pid);
if ($ret !== 0) {
$pid = 0;
}
return $pid;
}
/**
* kill the mattermost processes (owned by web server unix user) that do not match with any room
*/
public function killZombieBridges(): void {
// get list of running matterbridge processes
$cmd = 'ps -ux | grep "commands/matterbridge" | grep -v grep | awk \'{print $2}\'';
exec($cmd, $output, $ret);
$runningPidList = [];
foreach ($output as $o) {
array_push($runningPidList, intval($o));
}
// get list of what should be running
$expectedPidList = [];
$this->manager->forAllRooms(function ($room) use (&$expectedPidList) {
$bridge = $this->getBridgeOfRoom($room);
if ($bridge['enabled'] && $bridge['pid'] !== 0) {
array_push($expectedPidList, intval($bridge['pid']));
}
});
// kill what should not be running
foreach ($runningPidList as $runningPid) {
if (!in_array($runningPid, $expectedPidList)) {
$this->killPid($runningPid);
}
}
}
/**
* Utility to kill a process
*
* @param int $pid the process ID to kill
* @return bool if it was successfully killed
*/
private function killPid(int $pid): bool {
// kill
exec(sprintf('kill -9 %d', $pid), $output, $ret);
// check the process is gone
$isStillRunning = $this->isRunning($pid);
return (intval($ret) === 0 && !$isStillRunning);
}
/**
* Check if a process is running
*
* @param int $pid the process ID
* @return bool true if it's running
*/
private function isRunning(int $pid): bool {
try {
$result = shell_exec(sprintf('ps %d', $pid));
if (count(preg_split('/\n/', $result)) > 2) {
return true;
}
} catch (Exception $e) {
}
return false;
}
/**
* Stop all bridges
*
* @return bool success
*/
public function stopAllBridges(): bool {
$this->manager->forAllRooms(function ($room) {
if ($room->getType() === Room::GROUP_CALL || $room->getType() === Room::PUBLIC_CALL) {
$bridge = $this->getBridgeOfRoom($room);
// disable bridge in stored config
$bridge['enabled'] = false;
$this->saveBridgeToDb($room, $bridge);
// this will kill the bridge process
$this->checkBridgeProcess($token, $currentBridge);
}
});
// finally kill all potential zombie matterbridge processes
$this->killZombieBridges();
return true;
}
/**
* Get bridge information for one room
*
* @param Room $room the room
* @return array decoded json array
*/
private function getBridgeFromDb(Room $room): array {
$roomId = $room->getId();
$qb = $this->db->getQueryBuilder();
$qb->select('json_values')
->from('talk_bridges', 'b')
->where(
$qb->expr()->eq('room_id', $qb->createNamedParameter($roomId, IQueryBuilder::PARAM_INT))
);
$req = $qb->execute();
$jsonValues = '{"enabled":false,"pid":0,"parts":[]}';
while ($row = $req->fetch()) {
$jsonValues = $row['json_values'];
break;
}
$req->closeCursor();
return json_decode($jsonValues, true);
}
/**
* Save bridge information for one room
*
* @param Room $room the room
* @param array $bridge bridge values
*/
private function saveBridgeToDb(Room $room, array $bridge): void {
$roomId = $room->getId();
$jsonValues = json_encode($bridge);
$qb = $this->db->getQueryBuilder();
try {
$qb->insert('talk_bridges')
->values([
'room_id' => $qb->createNamedParameter($roomId, IQueryBuilder::PARAM_INT),
'json_values' => $qb->createNamedParameter($jsonValues, IQueryBuilder::PARAM_STR),
]);
$req = $qb->execute();
} catch (UniqueConstraintViolationException $e) {
$qb = $this->db->getQueryBuilder();
$qb->update('talk_bridges');
$qb->set('json_values', $qb->createNamedParameter($jsonValues, IQueryBuilder::PARAM_STR));
$qb->where(
$qb->expr()->eq('room_id', $qb->createNamedParameter($roomId, IQueryBuilder::PARAM_INT))
);
$req = $qb->execute();
}
}
public function getCurrentVersionFromBinary(): ?string {
$binaryPath = $this->config->getAppValue('spreed', 'matterbridge_binary');
if (!file_exists($binaryPath)) {
return null;
}
// is www user the file owner?
$user = posix_getpwuid(posix_getuid());
$fileOwner = posix_getpwuid(fileowner($binaryPath));
$userIsOwner = $user['name'] === $fileOwner['name'];
// get file group and user groups
$fileGid = filegroup($binaryPath);
$myGids = posix_getgroups();
// check permissions
$perms = fileperms($binaryPath);
$uExec = (($perms & 0x0040) && !($perms & 0x0800));
$gExec = (($perms & 0x0008) && !($perms & 0x0400));
$aExec = (($perms & 0x0001) && !($perms & 0x0200));
// 3 ways to have the permission :
// * be the owner and have u+x perm
// * not be the owner, be in the file group and have g+x perm
// * have o+x perm
$execPerm = $aExec
|| ($user['name'] === $fileOwner['name'] && $uExec)
|| ($user['name'] !== $fileOwner['name'] && in_array($fileGid, $myGids) && $gExec);
if (!$execPerm) {
throw new WrongPermissionsException();
}
$cmd = escapeshellcmd($binaryPath) . ' ' . escapeshellarg('-version');
@exec($cmd, $output, $returnCode);
if ($returnCode !== 0) {
return null;
}
return trim(implode("\n", $output));
}
}
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