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Editing: FetchAuthTokenCache.php

<?php

/*
 * Copyright 2010 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
namespace WPMailSMTP\Vendor\Google\Auth;

use WPMailSMTP\Vendor\Psr\Cache\CacheItemPoolInterface;
/**
 * A class to implement caching for any object implementing
 * FetchAuthTokenInterface
 */
class FetchAuthTokenCache implements FetchAuthTokenInterface, GetQuotaProjectInterface, GetUniverseDomainInterface, SignBlobInterface, ProjectIdProviderInterface, UpdateMetadataInterface
{
    use CacheTrait;
    /**
     * @var FetchAuthTokenInterface
     */
    private $fetcher;
    /**
     * @var int
     */
    private $eagerRefreshThresholdSeconds = 10;
    /**
     * @param FetchAuthTokenInterface $fetcher A credentials fetcher
     * @param array<mixed> $cacheConfig Configuration for the cache
     * @param CacheItemPoolInterface $cache
     */
    public function __construct(FetchAuthTokenInterface $fetcher, ?array $cacheConfig = null, ?CacheItemPoolInterface $cache = null)
    {
        $this->fetcher = $fetcher;
        $this->cache = $cache;
        $this->cacheConfig = \array_merge(['lifetime' => 1500, 'prefix' => '', 'cacheUniverseDomain' => $fetcher instanceof Credentials\GCECredentials], (array) $cacheConfig);
    }
    /**
     * @return FetchAuthTokenInterface
     */
    public function getFetcher()
    {
        return $this->fetcher;
    }
    /**
     * Implements FetchAuthTokenInterface#fetchAuthToken.
     *
     * Checks the cache for a valid auth token and fetches the auth tokens
     * from the supplied fetcher.
     *
     * @param callable $httpHandler callback which delivers psr7 request
     * @return array<mixed> the response
     * @throws \Exception
     */
    public function fetchAuthToken(?callable $httpHandler = null)
    {
        if ($cached = $this->fetchAuthTokenFromCache()) {
            return $cached;
        }
        $auth_token = $this->fetcher->fetchAuthToken($httpHandler);
        $this->saveAuthTokenInCache($auth_token);
        return $auth_token;
    }
    /**
     * @return string
     */
    public function getCacheKey()
    {
        return $this->getFullCacheKey($this->fetcher->getCacheKey());
    }
    /**
     * @return array<mixed>|null
     */
    public function getLastReceivedToken()
    {
        return $this->fetcher->getLastReceivedToken();
    }
    /**
     * Get the client name from the fetcher.
     *
     * @param callable $httpHandler An HTTP handler to deliver PSR7 requests.
     * @return string
     */
    public function getClientName(?callable $httpHandler = null)
    {
        if (!$this->fetcher instanceof SignBlobInterface) {
            throw new \RuntimeException('Credentials fetcher does not implement ' . 'Google\\Auth\\SignBlobInterface');
        }
        return $this->fetcher->getClientName($httpHandler);
    }
    /**
     * Sign a blob using the fetcher.
     *
     * @param string $stringToSign The string to sign.
     * @param bool $forceOpenSsl Require use of OpenSSL for local signing. Does
     *        not apply to signing done using external services. **Defaults to**
     *        `false`.
     * @return string The resulting signature.
     * @throws \RuntimeException If the fetcher does not implement
     *     `Google\Auth\SignBlobInterface`.
     */
    public function signBlob($stringToSign, $forceOpenSsl = \false)
    {
        if (!$this->fetcher instanceof SignBlobInterface) {
            throw new \RuntimeException('Credentials fetcher does not implement ' . 'Google\\Auth\\SignBlobInterface');
        }
        // Pass the access token from cache for credentials that sign blobs
        // using the IAM API. This saves a call to fetch an access token when a
        // cached token exists.
        if ($this->fetcher instanceof Credentials\GCECredentials || $this->fetcher instanceof Credentials\ImpersonatedServiceAccountCredentials) {
            $cached = $this->fetchAuthTokenFromCache();
            $accessToken = $cached['access_token'] ?? null;
            return $this->fetcher->signBlob($stringToSign, $forceOpenSsl, $accessToken);
        }
        return $this->fetcher->signBlob($stringToSign, $forceOpenSsl);
    }
    /**
     * Get the quota project used for this API request from the credentials
     * fetcher.
     *
     * @return string|null
     */
    public function getQuotaProject()
    {
        if ($this->fetcher instanceof GetQuotaProjectInterface) {
            return $this->fetcher->getQuotaProject();
        }
        return null;
    }
    /*
     * Get the Project ID from the fetcher.
     *
     * @param callable $httpHandler Callback which delivers psr7 request
     * @return string|null
     * @throws \RuntimeException If the fetcher does not implement
     *     `Google\Auth\ProvidesProjectIdInterface`.
     */
    public function getProjectId(?callable $httpHandler = null)
    {
        if (!$this->fetcher instanceof ProjectIdProviderInterface) {
            throw new \RuntimeException('Credentials fetcher does not implement ' . 'Google\\Auth\\ProvidesProjectIdInterface');
        }
        // Pass the access token from cache for credentials that require an
        // access token to fetch the project ID. This saves a call to fetch an
        // access token when a cached token exists.
        if ($this->fetcher instanceof Credentials\ExternalAccountCredentials) {
            $cached = $this->fetchAuthTokenFromCache();
            $accessToken = $cached['access_token'] ?? null;
            return $this->fetcher->getProjectId($httpHandler, $accessToken);
        }
        return $this->fetcher->getProjectId($httpHandler);
    }
    /*
     * Get the Universe Domain from the fetcher.
     *
     * @return string
     */
    public function getUniverseDomain() : string
    {
        if ($this->fetcher instanceof GetUniverseDomainInterface) {
            if ($this->cacheConfig['cacheUniverseDomain']) {
                return $this->getCachedUniverseDomain($this->fetcher);
            }
            return $this->fetcher->getUniverseDomain();
        }
        return GetUniverseDomainInterface::DEFAULT_UNIVERSE_DOMAIN;
    }
    /**
     * Updates metadata with the authorization token.
     *
     * @param array<mixed> $metadata metadata hashmap
     * @param string $authUri optional auth uri
     * @param callable $httpHandler callback which delivers psr7 request
     * @return array<mixed> updated metadata hashmap
     * @throws \RuntimeException If the fetcher does not implement
     *     `Google\Auth\UpdateMetadataInterface`.
     */
    public function updateMetadata($metadata, $authUri = null, ?callable $httpHandler = null)
    {
        if (!$this->fetcher instanceof UpdateMetadataInterface) {
            throw new \RuntimeException('Credentials fetcher does not implement ' . 'Google\\Auth\\UpdateMetadataInterface');
        }
        $cached = $this->fetchAuthTokenFromCache($authUri);
        if ($cached) {
            // Set the access token in the `Authorization` metadata header so
            // the downstream call to updateMetadata know they don't need to
            // fetch another token.
            if (isset($cached['access_token'])) {
                $metadata[self::AUTH_METADATA_KEY] = ['Bearer ' . $cached['access_token']];
            } elseif (isset($cached['id_token'])) {
                $metadata[self::AUTH_METADATA_KEY] = ['Bearer ' . $cached['id_token']];
            }
        }
        $newMetadata = $this->fetcher->updateMetadata($metadata, $authUri, $httpHandler);
        if (!$cached && ($token = $this->fetcher->getLastReceivedToken())) {
            $this->saveAuthTokenInCache($token, $authUri);
        }
        return $newMetadata;
    }
    /**
     * @param string|null $authUri
     * @return array<mixed>|null
     */
    private function fetchAuthTokenFromCache($authUri = null)
    {
        // Use the cached value if its available.
        //
        // TODO: correct caching; update the call to setCachedValue to set the expiry
        // to the value returned with the auth token.
        //
        // TODO: correct caching; enable the cache to be cleared.
        // if $authUri is set, use it as the cache key
        $cacheKey = $authUri ? $this->getFullCacheKey($authUri) : $this->fetcher->getCacheKey();
        $cached = $this->getCachedValue($cacheKey);
        if (\is_array($cached)) {
            if (empty($cached['expires_at'])) {
                // If there is no expiration data, assume token is not expired.
                // (for JwtAccess and ID tokens)
                return $cached;
            }
            if (\time() + $this->eagerRefreshThresholdSeconds < $cached['expires_at']) {
                // access token is not expired
                return $cached;
            }
        }
        return null;
    }
    /**
     * @param array<mixed> $authToken
     * @param string|null  $authUri
     * @return void
     */
    private function saveAuthTokenInCache($authToken, $authUri = null)
    {
        if (isset($authToken['access_token']) || isset($authToken['id_token'])) {
            // if $authUri is set, use it as the cache key
            $cacheKey = $authUri ? $this->getFullCacheKey($authUri) : $this->fetcher->getCacheKey();
            $this->setCachedValue($cacheKey, $authToken);
        }
    }
    private function getCachedUniverseDomain(GetUniverseDomainInterface $fetcher) : string
    {
        $cacheKey = $this->getFullCacheKey($fetcher->getCacheKey() . 'universe_domain');
        // @phpstan-ignore-line
        if ($universeDomain = $this->getCachedValue($cacheKey)) {
            return $universeDomain;
        }
        $universeDomain = $fetcher->getUniverseDomain();
        $this->setCachedValue($cacheKey, $universeDomain);
        return $universeDomain;
    }
}