<?php
session_start();

use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\SMTP;
use PHPMailer\PHPMailer\Exception;
use function Hestiacp\quoteshellarg\quoteshellarg;

try {
	require_once "vendor/autoload.php";
} catch (Throwable $ex) {
	$errstr =
		"Unable able to load required libraries. Please run v-add-sys-phpmailer in command line. Error: " .
		$ex->getMessage();
	trigger_error($errstr);
	echo $errstr;
	exit(1);
}

define("HESTIA_DIR_BIN", "/usr/local/hestia/bin/");
define("HESTIA_CMD", "/usr/bin/sudo /usr/local/hestia/bin/");
define("DEFAULT_PHP_VERSION", "php-" . exec('php -r "echo substr(phpversion(),0,3);"'));

// Load Hestia Config directly
load_hestia_config();
require_once dirname(__FILE__) . "/prevent_csrf.php";
require_once dirname(__FILE__) . "/helpers.php";

function destroy_sessions() {
	unset($_SESSION);
	session_unset();
	session_destroy();
	session_start();
}

$i = 0;

// Saving user IPs to the session for preventing session hijacking
$user_combined_ip = "";
if (isset($_SERVER["REMOTE_ADDR"])) {
	$user_combined_ip = $_SERVER["REMOTE_ADDR"];
}
if (isset($_SERVER["HTTP_CLIENT_IP"])) {
	$user_combined_ip .= "|" . $_SERVER["HTTP_CLIENT_IP"];
}
if (isset($_SERVER["HTTP_X_FORWARDED_FOR"])) {
	$user_combined_ip .= "|" . $_SERVER["HTTP_X_FORWARDED_FOR"];
}
if (isset($_SERVER["HTTP_FORWARDED_FOR"])) {
	$user_combined_ip .= "|" . $_SERVER["HTTP_FORWARDED_FOR"];
}
if (isset($_SERVER["HTTP_X_FORWARDED"])) {
	$user_combined_ip .= "|" . $_SERVER["HTTP_X_FORWARDED"];
}
if (isset($_SERVER["HTTP_FORWARDED"])) {
	$user_combined_ip .= "|" . $_SERVER["HTTP_FORWARDED"];
}
if (isset($_SERVER["HTTP_CF_CONNECTING_IP"])) {
	if (!empty($_SERVER["HTTP_CF_CONNECTING_IP"])) {
		$user_combined_ip = $_SERVER["HTTP_CF_CONNECTING_IP"];
	}
}

if (!isset($_SESSION["user_combined_ip"])) {
	$_SESSION["user_combined_ip"] = $user_combined_ip;
}

// Checking user to use session from the same IP he has been logged in
if ($_SESSION["user_combined_ip"] != $user_combined_ip && isset($_SESSION["user"])) {
	$v_user = quoteshellarg($_SESSION["user"]);
	$v_session_id = quoteshellarg($_SESSION["token"]);
	exec(HESTIA_CMD . "v-log-user-logout " . $v_user . " " . $v_session_id, $output, $return_var);
	destroy_sessions();
	header("Location: /login/");
	exit();
}

// Check system settings
if (!isset($_SESSION["VERSION"]) && !defined("NO_AUTH_REQUIRED")) {
	destroy_sessions();
	header("Location: /login/");
	exit();
}

// Check user session
if (!isset($_SESSION["user"]) && !defined("NO_AUTH_REQUIRED")) {
	destroy_sessions();
	header("Location: /login/");
	exit();
}

// Generate CSRF Token
if (isset($_SESSION["user"])) {
	if (!isset($_SESSION["token"])) {
		$token = bin2hex(random_bytes(16));
		$_SESSION["token"] = $token;
	}
}

if ($_SESSION["RELEASE_BRANCH"] == "release" && $_SESSION["DEBUG_MODE"] == "false") {
	define("JS_LATEST_UPDATE", "v=" . $_SESSION["VERSION"]);
} else {
	define("JS_LATEST_UPDATE", "r=" . time());
}

if (!defined("NO_AUTH_REQUIRED")) {
	if (empty($_SESSION["LAST_ACTIVITY"]) || empty($_SESSION["INACTIVE_SESSION_TIMEOUT"])) {
		destroy_sessions();
		header("Location: /login/");
	} elseif ($_SESSION["INACTIVE_SESSION_TIMEOUT"] * 60 + $_SESSION["LAST_ACTIVITY"] < time()) {
		$v_user = quoteshellarg($_SESSION["user"]);
		$v_session_id = quoteshellarg($_SESSION["token"]);
		exec(
			HESTIA_CMD . "v-log-user-logout " . $v_user . " " . $v_session_id,
			$output,
			$return_var,
		);
		destroy_sessions();
		header("Location: /login/");
		exit();
	} else {
		$_SESSION["LAST_ACTIVITY"] = time();
	}
}

function ipUsed() {
	[$http_host, $port] = explode(":", $_SERVER["HTTP_HOST"] . ":");
	if (filter_var($http_host, FILTER_VALIDATE_IP)) {
		return true;
	} else {
		return false;
	}
}

if (isset($_SESSION["user"])) {
	$user = quoteshellarg($_SESSION["user"]);
	$user_plain = htmlentities($_SESSION["user"]);
}

if (isset($_SESSION["look"]) && $_SESSION["look"] != "" && $_SESSION["userContext"] === "admin") {
	$user = quoteshellarg($_SESSION["look"]);
	$user_plain = htmlentities($_SESSION["look"]);
}

require_once dirname(__FILE__) . "/i18n.php";

function check_error($return_var) {
	if ($return_var > 0) {
		header("Location: /error/");
		exit();
	}
}

function check_return_code($return_var, $output) {
	if ($return_var != 0) {
		$error = implode("<br>", $output);
		if (empty($error)) {
			$error = sprintf(_("Error code:"), $return_var);
		}
		$_SESSION["error_msg"] = $error;
	}
}
function check_return_code_redirect($return_var, $output, $location) {
	if ($return_var != 0) {
		$error = implode("<br>", $output);
		if (empty($error)) {
			$error = sprintf(_("Error code:"), $return_var);
		}
		$_SESSION["error_msg"] = $error;
		header("Location:" . $location);
	}
}

function render_page($user, $TAB, $page) {
	$__template_dir = dirname(__DIR__) . "/templates/";
	$__pages_js_dir = dirname(__DIR__) . "/js/pages/";

	// Header
	include $__template_dir . "header.php";

	// Panel
	$panel = top_panel(empty($_SESSION["look"]) ? $_SESSION["user"] : $_SESSION["look"], $TAB);
	// Extract global variables
	// I think those variables should be passed via arguments
	extract($GLOBALS, EXTR_SKIP);

	// Policies controller
	@include_once dirname(__DIR__) . "/inc/policies.php";
	// Body
	include $__template_dir . "pages/" . $page . ".php";

	// Including common js files
	@include_once dirname(__DIR__) . "/templates/includes/end_js.php";
	// Including page specific js file
	if (file_exists($__pages_js_dir . $page . ".js")) {
		echo '<script src="/js/pages/' . $page . ".js?" . JS_LATEST_UPDATE . '"></script>';
	}

	// Footer
	include $__template_dir . "footer.php";
}

// Match $_SESSION['token'] against $_GET['token'] or $_POST['token']
// Usage: verify_csrf($_POST) or verify_csrf($_GET); Use verify_csrf($_POST,true) to return on failure instead of redirect
function verify_csrf($method, $return = false) {
	if (
		$method["token"] !== $_SESSION["token"] ||
		empty($method["token"]) ||
		empty($_SESSION["token"])
	) {
		if ($return === true) {
			return false;
		} else {
			header("Location: /login/");
			die();
		}
	} else {
		return true;
	}
}

function show_alert_message($data) {
	if (!empty($data["error_msg"]) || !empty($data["ok_msg"])) {
		if (!empty($data["error_msg"])) {
			$msg_icon = "fa-circle-exclamation status-icon red";
			$msg_text = htmlentities($data["error_msg"]);
			$msg_class = "inline-danger";
		} else {
			$msg_icon = "fa-circle-check status-icon green";
			$msg_text = $data["ok_msg"];
			$msg_class = "inline-success";
		}
		echo '<p class="' .
			$msg_class .
			' u-mb20"><i class="fas ' .
			$msg_icon .
			'"></i> ' .
			$msg_text .
			"</p>";
	}
}

function top_panel($user, $TAB) {
	$command = HESTIA_CMD . "v-list-user " . $user . " 'json'";
	exec($command, $output, $return_var);
	if ($return_var > 0) {
		destroy_sessions();
		$_SESSION["error_msg"] = _("You have been logged out. Please log in again.");
		header("Location: /login/");
		exit();
	}
	$panel = json_decode(implode("", $output), true);
	unset($output);

	// Log out active sessions for suspended users
	if ($panel[$user]["SUSPENDED"] === "yes" && $_SESSION["POLICY_USER_VIEW_SUSPENDED"] !== "yes") {
		if (empty($_SESSION["look"])) {
			destroy_sessions();
			$_SESSION["error_msg"] = _("You have been logged out. Please log in again.");
			header("Location: /login/");
		}
	}

	// Reset user permissions if changed while logged in
	if ($panel[$user]["ROLE"] !== $_SESSION["userContext"] && !isset($_SESSION["look"])) {
		unset($_SESSION["userContext"]);
		$_SESSION["userContext"] = $panel[$user]["ROLE"];
	}

	// Load user's selected theme and do not change it when impersonting user
	if (isset($panel[$user]["THEME"]) && !isset($_SESSION["look"])) {
		$_SESSION["userTheme"] = $panel[$user]["THEME"];
	}

	// Unset userTheme override variable if POLICY_USER_CHANGE_THEME is set to no
	if ($_SESSION["POLICY_USER_CHANGE_THEME"] === "no") {
		unset($_SESSION["userTheme"]);
	}

	// Set preferred sort order
	if (!isset($_SESSION["look"])) {
		$_SESSION["userSortOrder"] = $panel[$user]["PREF_UI_SORT"];
	}

	// Set home location URLs
	if ($_SESSION["userContext"] === "admin" && empty($_SESSION["look"])) {
		// Display users list for administrators unless they are impersonating a user account
		$home_url = "/list/user/";
	} else {
		// Set home location URL based on available package features from account
		if ($panel[$user]["WEB_DOMAINS"] != "0") {
			$home_url = "/list/web/";
		} elseif ($panel[$user]["DNS_DOMAINS"] != "0") {
			$home_url = "/list/dns/";
		} elseif ($panel[$user]["MAIL_DOMAINS"] != "0") {
			$home_url = "/list/mail/";
		} elseif ($panel[$user]["DATABASES"] != "0") {
			$home_url = "/list/db/";
		} elseif ($panel[$user]["CRON_JOBS"] != "0") {
			$home_url = "/list/cron/";
		} elseif ($panel[$user]["BACKUPS"] != "0") {
			$home_url = "/list/backups/";
		}
	}

	include dirname(__FILE__) . "/../templates/includes/panel.php";
	return $panel;
}

function translate_date($date) {
	$date = new DateTime($date);
	return $date->format("d") . " " . _($date->format("M")) . " " . $date->format("Y");
}

function humanize_time($usage) {
	if ($usage > 60) {
		$usage = $usage / 60;
		if ($usage > 24) {
			$usage = $usage / 24;
			$usage = number_format($usage);
			return sprintf(ngettext("%d day", "%d days", $usage), $usage);
		} else {
			$usage = round($usage);
			return sprintf(ngettext("%d hour", "%d hours", $usage), $usage);
		}
	} else {
		$usage = round($usage);
		return sprintf(ngettext("%d minute", "%d minutes", $usage), $usage);
	}
}

function humanize_usage_size($usage) {
	if ($usage == "unlimited") {
		return "∞";
	}
	if ($usage > 1024) {
		$usage = $usage / 1024;
		if ($usage > 1024) {
			$usage = $usage / 1024;
			if ($usage > 1024) {
				$usage = $usage / 1024;
				$usage = number_format($usage, 2);
			} else {
				$usage = number_format($usage, 2);
			}
		} else {
			$usage = number_format($usage, 2);
		}
	}
	return $usage;
}

function humanize_usage_measure($usage) {
	if ($usage == "unlimited") {
		return "mb";
	}

	$measure = "kb";
	if ($usage > 1024) {
		$usage = $usage / 1024;
		if ($usage > 1024) {
			$usage = $usage / 1024;
			$measure = $usage > 1024 ? "pb" : "tb";
		} else {
			$measure = "gb";
		}
	} else {
		$measure = "mb";
	}
	return $measure;
}

function get_percentage($used, $total) {
	if ($total = "unlimited") {
		//return 0 if unlimited
		return 0;
	}
	if (!isset($total)) {
		$total = 0;
	}
	if (!isset($used)) {
		$used = 0;
	}
	if ($total == 0) {
		$percent = 0;
	} else {
		$percent = $used / $total;
		$percent = $percent * 100;
		$percent = number_format($percent, 0, "", "");
		if ($percent < 0) {
			$percent = 0;
		} elseif ($percent > 100) {
			$percent = 100;
		}
	}
	return $percent;
}

function send_email($to, $subject, $mailtext, $from, $from_name, $to_name = "") {
	$mail = new PHPMailer();

	if (isset($_SESSION["USE_SERVER_SMTP"]) && $_SESSION["USE_SERVER_SMTP"] == "true") {
		if (!empty($_SESSION["SERVER_SMTP_ADDR"]) && $_SESSION["SERVER_SMTP_ADDR"] != "") {
			if (filter_var($_SESSION["SERVER_SMTP_ADDR"], FILTER_VALIDATE_EMAIL)) {
				$from = $_SESSION["SERVER_SMTP_ADDR"];
			}
		}

		$mail->IsSMTP();
		$mail->Mailer = "smtp";
		$mail->SMTPDebug = 0;
		$mail->SMTPAuth = true;
		$mail->SMTPSecure = $_SESSION["SERVER_SMTP_SECURITY"];
		$mail->Port = $_SESSION["SERVER_SMTP_PORT"];
		$mail->Host = $_SESSION["SERVER_SMTP_HOST"];
		$mail->Username = $_SESSION["SERVER_SMTP_USER"];
		$mail->Password = $_SESSION["SERVER_SMTP_PASSWD"];
	}

	$mail->IsHTML(true);
	$mail->ClearReplyTos();
	if (empty($to_name)) {
		$mail->AddAddress($to);
	} else {
		$mail->AddAddress($to, $to_name);
	}
	$mail->SetFrom($from, $from_name);

	$mail->CharSet = "utf-8";
	$mail->Subject = $subject;
	$content = $mailtext;
	$content = nl2br($content);
	$mail->MsgHTML($content);
	$mail->Send();
}

function list_timezones() {
	foreach (
		["AKST", "AKDT", "PST", "PDT", "MST", "MDT", "CST", "CDT", "EST", "EDT", "AST", "ADT"]
		as $timezone
	) {
		$tz = new DateTimeZone($timezone);
		$timezone_offsets[$timezone] = $tz->getOffset(new DateTime());
	}

	foreach (DateTimeZone::listIdentifiers() as $timezone) {
		$tz = new DateTimeZone($timezone);
		$timezone_offsets[$timezone] = $tz->getOffset(new DateTime());
	}

	foreach ($timezone_offsets as $timezone => $offset) {
		$offset_prefix = $offset < 0 ? "-" : "+";
		$offset_formatted = gmdate("H:i", abs($offset));
		$pretty_offset = "UTC${offset_prefix}${offset_formatted}";
		$c = new DateTime(gmdate("Y-M-d H:i:s"), new DateTimeZone("UTC"));
		$c->setTimezone(new DateTimeZone($timezone));
		$current_time = $c->format("H:i:s");
		$timezone_list[$timezone] = "$timezone [ $current_time ] ${pretty_offset}";
		#$timezone_list[$timezone] = "$timezone ${pretty_offset}";
	}
	return $timezone_list;
}

/**
 * A function that tells is it MySQL installed on the system, or it is MariaDB.
 *
 * Explanation:
 * $_SESSION['DB_SYSTEM'] has 'mysql' value even if MariaDB is installed, so you can't figure out is it really MySQL or it's MariaDB.
 * So, this function will make it clear.
 *
 * If MySQL is installed, function will return 'mysql' as a string.
 * If MariaDB is installed, function will return 'mariadb' as a string.
 *
 * Hint: if you want to check if PostgreSQL is installed - check value of $_SESSION['DB_SYSTEM']
 *
 * @return string
 */
function is_it_mysql_or_mariadb() {
	exec(HESTIA_CMD . "v-list-sys-services json", $output, $return_var);
	$data = json_decode(implode("", $output), true);
	unset($output);
	$mysqltype = "mysql";
	if (isset($data["mariadb"])) {
		$mysqltype = "mariadb";
	}
	return $mysqltype;
}

function load_hestia_config() {
	// Check system configuration
	exec(HESTIA_CMD . "v-list-sys-config json", $output, $return_var);
	$data = json_decode(implode("", $output), true);
	$sys_arr = $data["config"];
	foreach ($sys_arr as $key => $value) {
		$_SESSION[$key] = $value;
	}
}

/**
 * Returns the list of all web domains from all users grouped by Backend Template used and owner
 *
 * @return array
 */
function backendtpl_with_webdomains() {
	exec(HESTIA_CMD . "v-list-users json", $output, $return_var);
	$users = json_decode(implode("", $output), true);
	unset($output);

	$backend_list = [];
	foreach ($users as $user => $user_details) {
		exec(
			HESTIA_CMD . "v-list-web-domains " . quoteshellarg($user) . " json",
			$output,
			$return_var,
		);
		$domains = json_decode(implode("", $output), true);
		unset($output);
		foreach ($domains as $domain => $domain_details) {
			if (!empty($domain_details["BACKEND"])) {
				$backend = $domain_details["BACKEND"];
				$backend_list[$backend][$user][] = $domain;
			}
		}
	}
	return $backend_list;
}
/**
 * Check if password is valid
 *
 * @return int; 1 / 0
 */
function validate_password($password) {
	return preg_match('/^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(.){8,}$/', $password);
}