/home/kueuepay/www/vendor/firebase/php-jwt/src/CachedKeySet.php
<?php
namespace Firebase\JWT;
use ArrayAccess;
use InvalidArgumentException;
use LogicException;
use OutOfBoundsException;
use Psr\Cache\CacheItemInterface;
use Psr\Cache\CacheItemPoolInterface;
use Psr\Http\Client\ClientInterface;
use Psr\Http\Message\RequestFactoryInterface;
use RuntimeException;
use UnexpectedValueException;
/**
* @implements ArrayAccess<string, Key>
*/
class CachedKeySet implements ArrayAccess
{
/**
* @var string
*/
private $jwksUri;
/**
* @var ClientInterface
*/
private $httpClient;
/**
* @var RequestFactoryInterface
*/
private $httpFactory;
/**
* @var CacheItemPoolInterface
*/
private $cache;
/**
* @var ?int
*/
private $expiresAfter;
/**
* @var ?CacheItemInterface
*/
private $cacheItem;
/**
* @var array<string, array<mixed>>
*/
private $keySet;
/**
* @var string
*/
private $cacheKey;
/**
* @var string
*/
private $cacheKeyPrefix = 'jwks';
/**
* @var int
*/
private $maxKeyLength = 64;
/**
* @var bool
*/
private $rateLimit;
/**
* @var string
*/
private $rateLimitCacheKey;
/**
* @var int
*/
private $maxCallsPerMinute = 10;
/**
* @var string|null
*/
private $defaultAlg;
public function __construct(
string $jwksUri,
ClientInterface $httpClient,
RequestFactoryInterface $httpFactory,
CacheItemPoolInterface $cache,
int $expiresAfter = null,
bool $rateLimit = false,
string $defaultAlg = null
) {
$this->jwksUri = $jwksUri;
$this->httpClient = $httpClient;
$this->httpFactory = $httpFactory;
$this->cache = $cache;
$this->expiresAfter = $expiresAfter;
$this->rateLimit = $rateLimit;
$this->defaultAlg = $defaultAlg;
$this->setCacheKeys();
}
/**
* @param string $keyId
* @return Key
*/
public function offsetGet($keyId): Key
{
if (!$this->keyIdExists($keyId)) {
throw new OutOfBoundsException('Key ID not found');
}
return JWK::parseKey($this->keySet[$keyId], $this->defaultAlg);
}
/**
* @param string $keyId
* @return bool
*/
public function offsetExists($keyId): bool
{
return $this->keyIdExists($keyId);
}
/**
* @param string $offset
* @param Key $value
*/
public function offsetSet($offset, $value): void
{
throw new LogicException('Method not implemented');
}
/**
* @param string $offset
*/
public function offsetUnset($offset): void
{
throw new LogicException('Method not implemented');
}
/**
* @return array<mixed>
*/
private function formatJwksForCache(string $jwks): array
{
$jwks = json_decode($jwks, true);
if (!isset($jwks['keys'])) {
throw new UnexpectedValueException('"keys" member must exist in the JWK Set');
}
if (empty($jwks['keys'])) {
throw new InvalidArgumentException('JWK Set did not contain any keys');
}
$keys = [];
foreach ($jwks['keys'] as $k => $v) {
$kid = isset($v['kid']) ? $v['kid'] : $k;
$keys[(string) $kid] = $v;
}
return $keys;
}
private function keyIdExists(string $keyId): bool
{
if (null === $this->keySet) {
$item = $this->getCacheItem();
// Try to load keys from cache
if ($item->isHit()) {
// item found! retrieve it
$this->keySet = $item->get();
// If the cached item is a string, the JWKS response was cached (previous behavior).
// Parse this into expected format array<kid, jwk> instead.
if (\is_string($this->keySet)) {
$this->keySet = $this->formatJwksForCache($this->keySet);
}
}
}
if (!isset($this->keySet[$keyId])) {
if ($this->rateLimitExceeded()) {
return false;
}
$request = $this->httpFactory->createRequest('GET', $this->jwksUri);
$jwksResponse = $this->httpClient->sendRequest($request);
if ($jwksResponse->getStatusCode() !== 200) {
throw new UnexpectedValueException(
sprintf('HTTP Error: %d %s for URI "%s"',
$jwksResponse->getStatusCode(),
$jwksResponse->getReasonPhrase(),
$this->jwksUri,
),
$jwksResponse->getStatusCode()
);
}
$this->keySet = $this->formatJwksForCache((string) $jwksResponse->getBody());
if (!isset($this->keySet[$keyId])) {
return false;
}
$item = $this->getCacheItem();
$item->set($this->keySet);
if ($this->expiresAfter) {
$item->expiresAfter($this->expiresAfter);
}
$this->cache->save($item);
}
return true;
}
private function rateLimitExceeded(): bool
{
if (!$this->rateLimit) {
return false;
}
$cacheItem = $this->cache->getItem($this->rateLimitCacheKey);
if (!$cacheItem->isHit()) {
$cacheItem->expiresAfter(1); // # of calls are cached each minute
}
$callsPerMinute = (int) $cacheItem->get();
if (++$callsPerMinute > $this->maxCallsPerMinute) {
return true;
}
$cacheItem->set($callsPerMinute);
$this->cache->save($cacheItem);
return false;
}
private function getCacheItem(): CacheItemInterface
{
if (\is_null($this->cacheItem)) {
$this->cacheItem = $this->cache->getItem($this->cacheKey);
}
return $this->cacheItem;
}
private function setCacheKeys(): void
{
if (empty($this->jwksUri)) {
throw new RuntimeException('JWKS URI is empty');
}
// ensure we do not have illegal characters
$key = preg_replace('|[^a-zA-Z0-9_\.!]|', '', $this->jwksUri);
// add prefix
$key = $this->cacheKeyPrefix . $key;
// Hash keys if they exceed $maxKeyLength of 64
if (\strlen($key) > $this->maxKeyLength) {
$key = substr(hash('sha256', $key), 0, $this->maxKeyLength);
}
$this->cacheKey = $key;
if ($this->rateLimit) {
// add prefix
$rateLimitKey = $this->cacheKeyPrefix . 'ratelimit' . $key;
// Hash keys if they exceed $maxKeyLength of 64
if (\strlen($rateLimitKey) > $this->maxKeyLength) {
$rateLimitKey = substr(hash('sha256', $rateLimitKey), 0, $this->maxKeyLength);
}
$this->rateLimitCacheKey = $rateLimitKey;
}
}
}
Contact
top
In the digital age, privacy concerns have become increasingly paramount, prompting the European Union to enact the General Data Protection Regulation (GDPR) in 2018. Among its many provisions, GDPR sets strict guidelines for the collection and processing of personal data, including the use of cookies on websites. Privacy Policy
Allow
Decline
