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<?php
/**
* Register polyfills for old PHP versions.
*
* This way, the real function will only be called if it
* is available, and we won't force the use of our own
* implementation.
*/
function register_polyfills()
{
if (!function_exists('hash_equals')) {
function hash_equals($known_string, $user_string) {
call_user_func_array('_hash_equals', func_get_args());
}
}
if (!function_exists('random_bytes')) {
// If this function does not exist, it will be exposed
// automatically by paragonie/random_compat.
}
}
register_polyfills();
/**
* Path to the _custom_ directory.
*
* @param string $file Append this filename to the returned path.
* @return string
*/
function custom_path($file = '')
{
return __DIR__.'/../custom' . (!empty($file) ? '/'.$file : '');
}
/**
* Path to the _views_ directory.
*
* @param string $file Append this filename to the returned path.
* @return string
*/
function views_path($file = '')
{
return custom_path('views/install.tpl.php');
}
/**
* Path to the _admin_ directory.
*
* @param string $file Append this filename to the returned path.
* @return string
*/
function admin_path($file = '')
{
return __DIR__.'/../admin' . (!empty($file) ? '/'.$file : '');
}
/**
* Is moonmoon installed?
*
* @return bool
*/
function is_installed()
{
return file_exists(custom_path('config.yml')) && file_exists(custom_path('people.opml'));
}
/**
* Shortcut to Simplel10n::getString().
*
* @param string $str
* @param string $comment
* @return string
*/
function _g($str, $comment='')
{
return Simplel10n::getString($str, $comment);
}
/**
* Reset the moonmoon instance.
*/
function removeCustomFiles()
{
$toRemove = [
custom_path('config.yml'),
custom_path('people.opml'),
custom_path('people.opml.bak'),
custom_path('cache')
];
foreach ($toRemove as $path) {
if (file_exists($path)) {
unlink($path);
}
}
}
/**
* Compare two strings in a constant-time manner.
*
* It returns `true` if both strings are exactly the same
* (same size and same value).
*
* @param string $known_string
* @param string $user_string
* @return bool
*/
function _hash_equals($known_string = '', $user_string = '')
{
// In our case, it's not problematic if `$known_string`'s
// size leaks, we will only compare password hashes and
// CSRF tokens—their size is already somehow public.
if (!is_string($known_string) || !is_string($user_string)
|| strlen($known_string) !== strlen($user_string)) {
return false;
}
$ret = 0;
// Do not stop the comparison when a difference is found,
// always completely compare them.
for ($i = 0; $i < strlen($known_string); $i++) {
$ret |= (ord($known_string[$i]) ^ ord($user_string[$i]));
}
return !$ret;
}
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