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人事系统开发
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<?php
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namespace GuzzleHttp;
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use GuzzleHttp\Exception\BadResponseException;
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use GuzzleHttp\Exception\TooManyRedirectsException;
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use GuzzleHttp\Promise\PromiseInterface;
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use Psr\Http\Message\RequestInterface;
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use Psr\Http\Message\ResponseInterface;
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use Psr\Http\Message\UriInterface;
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/**
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* Request redirect middleware.
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*
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* Apply this middleware like other middleware using
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* {@see \GuzzleHttp\Middleware::redirect()}.
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*
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* @final
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*/
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class RedirectMiddleware
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{
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public const HISTORY_HEADER = 'X-Guzzle-Redirect-History';
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public const STATUS_HISTORY_HEADER = 'X-Guzzle-Redirect-Status-History';
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/**
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* @var array
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*/
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public static $defaultSettings = [
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'max' => 5,
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'protocols' => ['http', 'https'],
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'strict' => false,
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'referer' => false,
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'track_redirects' => false,
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];
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/**
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* @var callable(RequestInterface, array): PromiseInterface
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*/
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private $nextHandler;
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/**
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* @param callable(RequestInterface, array): PromiseInterface $nextHandler Next handler to invoke.
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*/
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public function __construct(callable $nextHandler)
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{
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$this->nextHandler = $nextHandler;
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}
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public function __invoke(RequestInterface $request, array $options): PromiseInterface
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{
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$fn = $this->nextHandler;
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if (empty($options['allow_redirects'])) {
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return $fn($request, $options);
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}
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if ($options['allow_redirects'] === true) {
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$options['allow_redirects'] = self::$defaultSettings;
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} elseif (!\is_array($options['allow_redirects'])) {
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throw new \InvalidArgumentException('allow_redirects must be true, false, or array');
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} else {
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// Merge the default settings with the provided settings
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$options['allow_redirects'] += self::$defaultSettings;
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}
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if (empty($options['allow_redirects']['max'])) {
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return $fn($request, $options);
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}
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return $fn($request, $options)
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->then(function (ResponseInterface $response) use ($request, $options) {
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return $this->checkRedirect($request, $options, $response);
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});
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}
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/**
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* @return ResponseInterface|PromiseInterface
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*/
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public function checkRedirect(RequestInterface $request, array $options, ResponseInterface $response)
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{
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if (\strpos((string) $response->getStatusCode(), '3') !== 0
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|| !$response->hasHeader('Location')
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) {
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return $response;
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}
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$this->guardMax($request, $response, $options);
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$nextRequest = $this->modifyRequest($request, $options, $response);
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// If authorization is handled by curl, unset it if URI is cross-origin.
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if (Psr7\UriComparator::isCrossOrigin($request->getUri(), $nextRequest->getUri()) && defined('\CURLOPT_HTTPAUTH')) {
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unset(
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$options['curl'][\CURLOPT_HTTPAUTH],
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$options['curl'][\CURLOPT_USERPWD]
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);
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}
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if (isset($options['allow_redirects']['on_redirect'])) {
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($options['allow_redirects']['on_redirect'])(
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$request,
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$response,
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$nextRequest->getUri()
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);
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}
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$promise = $this($nextRequest, $options);
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// Add headers to be able to track history of redirects.
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if (!empty($options['allow_redirects']['track_redirects'])) {
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return $this->withTracking(
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$promise,
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(string) $nextRequest->getUri(),
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$response->getStatusCode()
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);
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}
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return $promise;
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}
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/**
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* Enable tracking on promise.
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*/
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private function withTracking(PromiseInterface $promise, string $uri, int $statusCode): PromiseInterface
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{
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return $promise->then(
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static function (ResponseInterface $response) use ($uri, $statusCode) {
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// Note that we are pushing to the front of the list as this
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// would be an earlier response than what is currently present
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// in the history header.
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$historyHeader = $response->getHeader(self::HISTORY_HEADER);
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$statusHeader = $response->getHeader(self::STATUS_HISTORY_HEADER);
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\array_unshift($historyHeader, $uri);
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\array_unshift($statusHeader, (string) $statusCode);
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return $response->withHeader(self::HISTORY_HEADER, $historyHeader)
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->withHeader(self::STATUS_HISTORY_HEADER, $statusHeader);
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}
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);
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}
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/**
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* Check for too many redirects.
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*
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* @throws TooManyRedirectsException Too many redirects.
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*/
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private function guardMax(RequestInterface $request, ResponseInterface $response, array &$options): void
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{
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$current = $options['__redirect_count']
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?? 0;
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$options['__redirect_count'] = $current + 1;
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$max = $options['allow_redirects']['max'];
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if ($options['__redirect_count'] > $max) {
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throw new TooManyRedirectsException("Will not follow more than {$max} redirects", $request, $response);
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}
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}
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public function modifyRequest(RequestInterface $request, array $options, ResponseInterface $response): RequestInterface
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{
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// Request modifications to apply.
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$modify = [];
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$protocols = $options['allow_redirects']['protocols'];
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// Use a GET request if this is an entity enclosing request and we are
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// not forcing RFC compliance, but rather emulating what all browsers
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// would do.
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$statusCode = $response->getStatusCode();
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if ($statusCode == 303
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|| ($statusCode <= 302 && !$options['allow_redirects']['strict'])
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) {
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$safeMethods = ['GET', 'HEAD', 'OPTIONS'];
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$requestMethod = $request->getMethod();
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$modify['method'] = in_array($requestMethod, $safeMethods) ? $requestMethod : 'GET';
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$modify['body'] = '';
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}
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$uri = self::redirectUri($request, $response, $protocols);
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if (isset($options['idn_conversion']) && ($options['idn_conversion'] !== false)) {
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$idnOptions = ($options['idn_conversion'] === true) ? \IDNA_DEFAULT : $options['idn_conversion'];
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$uri = Utils::idnUriConvert($uri, $idnOptions);
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}
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$modify['uri'] = $uri;
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Psr7\Message::rewindBody($request);
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// Add the Referer header if it is told to do so and only
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// add the header if we are not redirecting from https to http.
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if ($options['allow_redirects']['referer']
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&& $modify['uri']->getScheme() === $request->getUri()->getScheme()
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) {
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$uri = $request->getUri()->withUserInfo('');
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$modify['set_headers']['Referer'] = (string) $uri;
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} else {
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$modify['remove_headers'][] = 'Referer';
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}
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// Remove Authorization and Cookie headers if URI is cross-origin.
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if (Psr7\UriComparator::isCrossOrigin($request->getUri(), $modify['uri'])) {
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$modify['remove_headers'][] = 'Authorization';
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$modify['remove_headers'][] = 'Cookie';
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}
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return Psr7\Utils::modifyRequest($request, $modify);
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}
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/**
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* Set the appropriate URL on the request based on the location header.
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*/
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private static function redirectUri(
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RequestInterface $request,
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ResponseInterface $response,
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array $protocols
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): UriInterface {
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$location = Psr7\UriResolver::resolve(
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$request->getUri(),
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new Psr7\Uri($response->getHeaderLine('Location'))
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);
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// Ensure that the redirect URI is allowed based on the protocols.
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if (!\in_array($location->getScheme(), $protocols)) {
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throw new BadResponseException(\sprintf('Redirect URI, %s, does not use one of the allowed redirect protocols: %s', $location, \implode(', ', $protocols)), $request, $response);
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}
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return $location;
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}
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}
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