<?php

const SUBPATH_REGEX = '^[a-z0-9-]{4,63}$';
const ED25519_PUBKEY_REGEX = '^[a-zA-Z0-9/+]{68}$';

function htSetupUserFs(string $id): void {
	// Setup SFTP directory
	if (mkdir(CONF['ht']['ht_path'] . '/fs/' . $id, 0000) !== true)
		output(500, 'Can\'t create user directory.');
	if (chmod(CONF['ht']['ht_path'] . '/fs/' . $id, 0775) !== true)
		output(500, 'Can\'t chmod user directory.');
	exescape([
		CONF['ht']['sudo_path'],
		'--',
		CONF['ht']['chgrp_path'],
		'--no-dereference',
		'--',
		CONF['ht']['sftpgo_group'],
		CONF['ht']['ht_path'] . '/fs/' . $id,
	], result_code: $code);
	if ($code !== 0)
		output(500, 'Can\'t change user directory group.');

	// Setup Tor config directory
	if (mkdir(CONF['ht']['tor_config_path'] . '/' . $id, 0000) !== true)
		output(500, 'Can\'t create Tor config directory.');
	if (chmod(CONF['ht']['tor_config_path'] . '/' . $id, 0775) !== true)
		output(500, 'Can\'t chmod Tor config directory.');

	// Setup Tor keys directory
	exescape([
		CONF['ht']['sudo_path'],
		'-u',
		CONF['ht']['tor_user'],
		'--',
		CONF['ht']['mkdir_path'],
		'--mode=0700',
		'--',
		CONF['ht']['tor_keys_path'] . '/' . $id,
	], result_code: $code);
	if ($code !== 0)
		output(500, 'Can\'t create Tor keys directory.');
}

function checkDomainFormat(string $domain): void {
	// If the domain must end without a dot
	if (!filter_var($domain, FILTER_VALIDATE_DOMAIN) OR !preg_match('/^(?=^.{1,254}$)([a-z0-9_-]{1,63}\.){1,126}[a-z0-9]{1,63}$/D', $domain))
		output(403, _('Domain malformed.'));
}

function formatDomain(string $domain): string {
	$domain = rtrim(strtolower($domain), '.');
	checkDomainFormat($domain);
	return $domain;
}

function listFsDirs(string $username): array {
	if ($username === '')
		return [];
	$absoluteDirs = glob(CONF['ht']['ht_path'] . '/fs/' . $username . '/*/', GLOB_ONLYDIR);
	$dirs = [];
	foreach ($absoluteDirs as $absoluteDir)
		if (preg_match('/^[a-zA-Z0-9_-]{1,64}$/D', basename($absoluteDir)))
			array_push($dirs, basename($absoluteDir));
	return $dirs;
}

function addSite(string $username, string $siteDir, string $address, string $type): void {
	insert('sites', [
		'username' => $username,
		'site_dir' => $siteDir,
		'address' => $address,
		'type' => $type,
		'creation_date' => date('Y-m-d H:i:s'),
	]);
}

function dirsStatuses(string $type): array {
	if (isset($_SESSION['id']) !== true)
		return [];
	$dbDirs = query('select', 'sites', [
		'username' => $_SESSION['id'],
		'type' => $type,
	], 'site_dir');
	$dirs = [];
	foreach (listFsDirs($_SESSION['id']) as $fsDir)
		$dirs[$fsDir] = in_array($fsDir, $dbDirs);
	return $dirs;
}

function htRelativeSymlink(string $target, string $name): void {
	chdir(pathinfo($name)['dirname']);
	$symlink = symlink($target, pathinfo($name)['basename']);
	chdir(ROOT_PATH);
	if ($symlink !== true)
		output(500, 'Unable to create symlink.');
}

function htDeleteSite(string $address, string $type, string $user_id): void {

	if ($type === 'onion') {
		$dir = query('select', 'sites', [
			'username' => $user_id,
			'address' => $address,
			'type' => $type,
		], 'site_dir')[0];

		// Delete Tor config
		if (unlink(CONF['ht']['tor_config_path'] . '/' . $user_id . '/' . $dir) !== true)
			output(500, 'Failed to delete Tor configuration.');

		// Reload Tor
		exescape([
			CONF['ht']['sudo_path'],
			'--',
			...explode(' ', CONF['ht']['tor_reload_cmd']),
		], result_code: $code);
		if ($code !== 0)
			output(500, 'Failed to reload Tor.');

		// Delete Tor keys
		exescape([
			CONF['ht']['sudo_path'],
			'-u',
			CONF['ht']['tor_user'],
			'--',
			CONF['ht']['rm_path'],
			'-r',
			'--',
			CONF['ht']['tor_keys_path'] . '/' . $user_id . '/' . $dir,
		], result_code: $code);
		if ($code !== 0)
			output(500, 'Failed to delete Tor keys.');
	}

	if ($type === 'dns') {
		// Delete Let's Encrypt certificate
		exescape([
			CONF['ht']['sudo_path'],
			CONF['ht']['certbot_path'],
			'delete',
			'--quiet',
			'--cert-name',
			$address,
		], result_code: $code);
		if ($code !== 0)
			output(500, 'Certbot failed to delete the Let\'s Encrypt certificate.');
	}

	$link = CONF['ht']['ht_path'] . '/uri/' . match ($type) {
		'onion', 'dns' => $address,
		'subdomain' => $address . '.' . CONF['ht']['subdomain_domain'],
		'subpath' => CONF['ht']['subpath_domain'] . '/' . $address,
	};

	if (unlink($link) !== true)
		output(500, 'Unable to delete symlink.');

	query('delete', 'sites', [
		'username' => $user_id,
		'type' => $type,
		'address' => $address,
	]);
}