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diff --git a/core.php b/core.php
index 6eccbe5..e0c6b83 100644
--- a/core.php
+++ b/core.php
@@ -1,175 +1,175 @@
<?php
namespace Keruald;
/**
* Keruald, core libraries for Pluton and Xen engines.
*
* Global functions
*/
///
/// Strings
///
/**
* Pads a multibytes string to a certain length with another string
*
* @param string $str the input string
* @param int $pad_length the target string size
* @param string $pad_string the padding characters (optional, default is space)
* @param int $pad_type STR_PAD_RIGHT, STR_PAD_LEFT, or STR_PAD_BOTH (optional, default is STR_PAD_RIGHT)
* @param string the character encoding (optional)
*
* @return string the padded string
*
*/
function mb_str_pad($input, $pad_length, $pad_string = ' ', $pad_type = STR_PAD_RIGHT, $encoding = null) {
// Inspired by Ronald Ulysses Swanson method
// http://stackoverflow.com/a/27194169/1930997
// who followed the str_pad PHP implementation.
if ($encoding === null) {
$encoding = mb_internal_encoding();
}
$padBefore = $pad_type === STR_PAD_BOTH || $pad_type === STR_PAD_LEFT;
$padAfter = $pad_type === STR_PAD_BOTH || $pad_type === STR_PAD_RIGHT;
$pad_length -= mb_strlen($input, $encoding);
if ($padBefore && $padAfter) {
$targetLength = $pad_length / 2;
} else {
$targetLength = $pad_length;
}
$strToRepeatLength = mb_strlen($pad_string, $encoding);
$repeatTimes = ceil($targetLength / $strToRepeatLength);
$repeatedString = str_repeat($pad_string, max(0, $repeatTimes)); // safe if used with valid Unicode sequences (any charset)
$paddedString = '';
if ($padBefore) {
$paddedString = mb_substr($repeatedString, 0, floor($targetLength), $encoding);
}
$paddedString .= $input;
if ($padAfter) {
$paddedString .= mb_substr($repeatedString, 0, ceil($targetLength), $encoding);
}
return $paddedString;
}
///
/// Identifiers
///
/**
* Generates a RFC 4211 compliant v4 UUID (random-based)
*
* @return string The UUID
*/
function uuid () {
//Code by Andrew Moore
//See http://php.net/manual/en/function.uniqid.php#94959
// https://www.ietf.org/rfc/rfc4122.txt
return sprintf(
'%04x%04x-%04x-%04x-%04x-%04x%04x%04x',
// 32 bits for "time_low"
mt_rand(0, 0xffff), mt_rand(0, 0xffff),
// 16 bits for "time_mid"
mt_rand(0, 0xffff),
// 16 bits for "time_hi_and_version",
// four most significant bits holds version number 4
mt_rand(0, 0x0fff) | 0x4000,
// 16 bits, 8 bits for "clk_seq_hi_res",
// 8 bits for "clk_seq_low",
// two most significant bits holds zero and one for variant DCE1.1
mt_rand(0, 0x3fff) | 0x8000,
// 48 bits for "node"
mt_rand(0, 0xffff), mt_rand(0, 0xffff), mt_rand(0, 0xffff)
);
}
///
/// Error and debug
///
/**
* Prints human-readable information about a variable, wrapped in a <pre> block
*
* @param mixed $variable the variable to dump
*/
function dprint_r ($variable) {
echo '<pre>';
print_r($variable);
echo '</pre>';
}
/**
* Prints human-readable information about a variable, wrapped in a <pre> block
* then dies
*
* @param mixed $variable the variable to dump
*/
function dieprint_r ($variable) {
dprint_r($variable);
die;
};
///
/// Client information
///
/**
* Returns the full header or the IP part of it
*
* @param string $value The header value
* @return string the IP part
*/
function extract_client_ip_from_header ($value) {
if (strpos($value, ',') !== false) {
//Header contains 'clientIP, proxyIP, anotherProxyIP'
//The first value is so the one to return.
//See draft-ietf-appsawg-http-forwarded-10.
$ips = explode(',', $value, 2);
return trim($ips[0]);
}
return $value;
}
/**
* Gets remote IP address.
*
* This is intended as a drop-in replacement for $_SERVER['REMOTE_ADDR'],
- * which takes in consideration proxy values.
+ * which takes in consideration proxy values, blindly trusted.
*/
function get_remote_addr () {
$candidates = [
//Standard header provided by draft-ietf-appsawg-http-forwarded-10
'HTTP_X_FORWARDED_FOR',
//Legacy headers
'HTTP_CLIENT_IP',
'HTTP_FORWARDED',
'HTTP_FORWARDED_FOR',
'HTTP_X_CLUSTER_CLIENT_IP',
'HTTP_X_FORWARDED',
//Default header if no proxy information could be detected
'REMOTE_ADDR',
];
foreach ($candidates as $candidate) {
if (array_key_exists($candidate, $_SERVER)) {
return extract_client_ip_from_header($_SERVER[$candidate]);
}
}
return '';
}

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