<?php

/*
	This file is a part of myTinyTodo.
	(C) Copyright 2009-2010,2020-2022 Max Pozdeev <maxpozdeev@gmail.com>
	Licensed under the GNU GPL version 2 or any later. See file COPYRIGHT for details.
*/

function htmlarray($a, $exclude=null)
{
	htmlarray_ref($a, $exclude);
	return $a;
}

function htmlarray_ref(&$a, $exclude=null)
{
	if(!$a) return;
	if(!is_array($a)) {
		$a = htmlspecialchars($a);
		return;
	}
	reset($a);
	if($exclude && !is_array($exclude)) $exclude = array($exclude);
	foreach($a as $k=>$v)
	{
		if(is_array($v)) $a[$k] = htmlarray($v, $exclude);
		elseif(!$exclude) $a[$k] = htmlspecialchars($v);
		elseif(!in_array($k, $exclude)) $a[$k] = htmlspecialchars($v);
	}
	return;
}

function _post($param,$defvalue = '')
{
	if(!isset($_POST[$param])) 	{
		return $defvalue;
	}
	else {
		return $_POST[$param];
	}
}

function _get($param,$defvalue = '')
{
	if(!isset($_GET[$param])) {
		return $defvalue;
	}
	else {
		return $_GET[$param];
	}
}

function _server($param, $defvalue = '')
{
	if ( !isset($_SERVER[$param]) ) {
		return $defvalue;
	}
	else {
		return $_SERVER[$param];
	}
}

function formatDate3($format, $ay, $am, $ad, $lang)
{
	# F - month long, M - month short
	# m - month 2-digit, n - month 1-digit
	# d - day 2-digit, j - day 1-digit
	$ml = $lang->get('months_long');
	$ms = $lang->get('months_short');
	$Y = $ay;
	$YC = 100 * floor($Y/100); //...1900,2000,2100...
	if ($YC == 2000) $y = $Y < $YC+10 ? '0'.($Y-$YC) : $Y-$YC;
	else $y = $Y;
	$n = $am;
	$m = $n < 10 ? '0'.$n : $n;
	$F = $ml[$am-1];
	$M = $ms[$am-1];
	$j = $ad;
	$d = $j < 10 ? '0'.$j : $j;
	return strtr($format, array('Y'=>$Y, 'y'=>$y, 'F'=>$F, 'M'=>$M, 'n'=>$n, 'm'=>$m, 'd'=>$d, 'j'=>$j));
}

function getRequestUri()
{
	// Do not use HTTP_X_REWRITE_URL due to CVE-2018-14773
	// SCRIPT_NAME or PATH_INFO ?
	if (isset($_SERVER['REQUEST_URI'])) {
		return $_SERVER['REQUEST_URI'];
	}
	else if (isset($_SERVER['ORIG_PATH_INFO']))  // IIS 5.0 CGI
	{
		$uri = $_SERVER['ORIG_PATH_INFO']; //has no query
		if (!empty($_SERVER['QUERY_STRING'])) $uri .= '?'. $_SERVER['QUERY_STRING'];
		return $uri;
	}
}

function url_dir($url, $onlyPath = 1)
{
	if (false !== $p = strpos($url, '?')) {
		$url = substr($url, 0, $p); # to avoid parse errors on strange query strings
	}
	if ($onlyPath) {
		$url = parse_url($url, PHP_URL_PATH);
	}
	if ($url == '') {
		return '/';
	}
	if (substr($url, -1) == '/') {
		return $url;
	}
	if (false !== $p = strrpos($url, '/')) {
		return substr($url, 0, $p+1);
	}
	return '/';
}

function removeNewLines($s)
{
	return str_replace( ["\r","\n"], '', $s );
}

/**
 * Generates UUID v4
 * Implementation from https://github.com/symfony/polyfill-uuid
 */
function generateUUID(): string
{
	$uuid = bin2hex(random_bytes(16));
	return sprintf('%08s-%04s-4%03s-%04x-%012s',
		substr($uuid, 0, 8),
		substr($uuid, 8, 4),
		// $uuid[14] = 4
		substr($uuid, 13, 3),
		hexdec(substr($uuid, 16, 4)) & 0x3fff | 0x8000,
		substr($uuid, 20, 12)
    );
}

function passwordHash(string $p): string
{
	if ($p == '') return '';
	return 'sha256:'. hash('sha256', $p);
}

/**
 * Compares raw (not hashed) password with password hash. Return true if equals.
 * @param string $p Raw password
 * @param string $hash Password hash
 * @return bool
 */
function isPasswordEqualsToHash(string $p, string $hash): bool
{
	if ($hash == '' && $p == '') return true;
	if ($hash == '' || $p == '') return false;
	if ( false !== $pos = strpos($hash, ':') ) {
		$algo = substr($hash, 0, $pos);
		if ($algo != 'sha256') throw new Exception("Unsupported algo of password hash");
		if ( hash_equals($hash, passwordHash($p)) ) return true;
	}
	return false;
}

?>