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RedirectMiddleware.php
001 <?php
002 namespace GuzzleHttp;
003
004 use GuzzleHttp\Exception\BadResponseException;
005 use GuzzleHttp\Exception\TooManyRedirectsException;
006 use GuzzleHttp\Promise\PromiseInterface;
007 use GuzzleHttp\Psr7;
008 use Psr\Http\Message\RequestInterface;
009 use Psr\Http\Message\ResponseInterface;
010 use Psr\Http\Message\UriInterface;
011
012 /**
013 * Request redirect middleware.
014 *
015 * Apply this middleware like other middleware using
016 * {@see \GuzzleHttp\Middleware::redirect()}.
017 */
018 class RedirectMiddleware
019 {
020 const HISTORY_HEADER = 'X-Guzzle-Redirect-History';
021
022 const STATUS_HISTORY_HEADER = 'X-Guzzle-Redirect-Status-History';
023
024 public static $defaultSettings = [
025 'max' => 5,
026 'protocols' => ['http', 'https'],
027 'strict' => false,
028 'referer' => false,
029 'track_redirects' => false,
030 ];
031
032 /** @var callable */
033 private $nextHandler;
034
035 /**
036 * @param callable $nextHandler Next handler to invoke.
037 */
038 public function __construct(callable $nextHandler)
039 {
040 $this->nextHandler = $nextHandler;
041 }
042
043 /**
044 * @param RequestInterface $request
045 * @param array $options
046 *
047 * @return PromiseInterface
048 */
049 public function __invoke(RequestInterface $request, array $options)
050 {
051 $fn = $this->nextHandler;
052
053 if (empty($options['allow_redirects'])) {
054 return $fn($request, $options);
055 }
056
057 if ($options['allow_redirects'] === true) {
058 $options['allow_redirects'] = self::$defaultSettings;
059 } elseif (!is_array($options['allow_redirects'])) {
060 throw new \InvalidArgumentException('allow_redirects must be true, false, or array');
061 } else {
062 // Merge the default settings with the provided settings
063 $options['allow_redirects'] += self::$defaultSettings;
064 }
065
066 if (empty($options['allow_redirects']['max'])) {
067 return $fn($request, $options);
068 }
069
070 return $fn($request, $options)
071 ->then(function (ResponseInterface $response) use ($request, $options) {
072 return $this->checkRedirect($request, $options, $response);
073 });
074 }
075
076 /**
077 * @param RequestInterface $request
078 * @param array $options
079 * @param ResponseInterface $response
080 *
081 * @return ResponseInterface|PromiseInterface
082 */
083 public function checkRedirect(
084 RequestInterface $request,
085 array $options,
086 ResponseInterface $response
087 ) {
088 if (substr($response->getStatusCode(), 0, 1) != '3'
089 || !$response->hasHeader('Location')
090 ) {
091 return $response;
092 }
093
094 $this->guardMax($request, $options);
095 $nextRequest = $this->modifyRequest($request, $options, $response);
096
097 // If authorization is handled by curl, unset it if URI is cross-origin.
098 if (Psr7\UriComparator::isCrossOrigin($request->getUri(), $nextRequest->getUri()) && defined('\CURLOPT_HTTPAUTH')) {
099 unset(
100 $options['curl'][\CURLOPT_HTTPAUTH],
101 $options['curl'][\CURLOPT_USERPWD]
102 );
103 }
104
105 if (isset($options['allow_redirects']['on_redirect'])) {
106 call_user_func(
107 $options['allow_redirects']['on_redirect'],
108 $request,
109 $response,
110 $nextRequest->getUri()
111 );
112 }
113
114 /** @var PromiseInterface|ResponseInterface $promise */
115 $promise = $this($nextRequest, $options);
116
117 // Add headers to be able to track history of redirects.
118 if (!empty($options['allow_redirects']['track_redirects'])) {
119 return $this->withTracking(
120 $promise,
121 (string) $nextRequest->getUri(),
122 $response->getStatusCode()
123 );
124 }
125
126 return $promise;
127 }
128
129 /**
130 * Enable tracking on promise.
131 *
132 * @return PromiseInterface
133 */
134 private function withTracking(PromiseInterface $promise, $uri, $statusCode)
135 {
136 return $promise->then(
137 function (ResponseInterface $response) use ($uri, $statusCode) {
138 // Note that we are pushing to the front of the list as this
139 // would be an earlier response than what is currently present
140 // in the history header.
141 $historyHeader = $response->getHeader(self::HISTORY_HEADER);
142 $statusHeader = $response->getHeader(self::STATUS_HISTORY_HEADER);
143 array_unshift($historyHeader, $uri);
144 array_unshift($statusHeader, $statusCode);
145 return $response->withHeader(self::HISTORY_HEADER, $historyHeader)
146 ->withHeader(self::STATUS_HISTORY_HEADER, $statusHeader);
147 }
148 );
149 }
150
151 /**
152 * Check for too many redirects.
153 *
154 * @return void
155 *
156 * @throws TooManyRedirectsException Too many redirects.
157 */
158 private function guardMax(RequestInterface $request, array &$options)
159 {
160 $current = isset($options['__redirect_count'])
161 ? $options['__redirect_count']
162 : 0;
163 $options['__redirect_count'] = $current + 1;
164 $max = $options['allow_redirects']['max'];
165
166 if ($options['__redirect_count'] > $max) {
167 throw new TooManyRedirectsException(
168 "Will not follow more than {$max} redirects",
169 $request
170 );
171 }
172 }
173
174 /**
175 * @param RequestInterface $request
176 * @param array $options
177 * @param ResponseInterface $response
178 *
179 * @return RequestInterface
180 */
181 public function modifyRequest(
182 RequestInterface $request,
183 array $options,
184 ResponseInterface $response
185 ) {
186 // Request modifications to apply.
187 $modify = [];
188 $protocols = $options['allow_redirects']['protocols'];
189
190 // Use a GET request if this is an entity enclosing request and we are
191 // not forcing RFC compliance, but rather emulating what all browsers
192 // would do.
193 $statusCode = $response->getStatusCode();
194 if ($statusCode == 303 ||
195 ($statusCode <= 302 && !$options['allow_redirects']['strict'])
196 ) {
197 $modify['method'] = 'GET';
198 $modify['body'] = '';
199 }
200
201 $uri = self::redirectUri($request, $response, $protocols);
202 if (isset($options['idn_conversion']) && ($options['idn_conversion'] !== false)) {
203 $idnOptions = ($options['idn_conversion'] === true) ? IDNA_DEFAULT : $options['idn_conversion'];
204 $uri = Utils::idnUriConvert($uri, $idnOptions);
205 }
206
207 $modify['uri'] = $uri;
208 Psr7\rewind_body($request);
209
210 // Add the Referer header if it is told to do so and only
211 // add the header if we are not redirecting from https to http.
212 if ($options['allow_redirects']['referer']
213 && $modify['uri']->getScheme() === $request->getUri()->getScheme()
214 ) {
215 $uri = $request->getUri()->withUserInfo('');
216 $modify['set_headers']['Referer'] = (string) $uri;
217 } else {
218 $modify['remove_headers'][] = 'Referer';
219 }
220
221 // Remove Authorization and Cookie headers if URI is cross-origin.
222 if (Psr7\UriComparator::isCrossOrigin($request->getUri(), $modify['uri'])) {
223 $modify['remove_headers'][] = 'Authorization';
224 $modify['remove_headers'][] = 'Cookie';
225 }
226
227 return Psr7\modify_request($request, $modify);
228 }
229
230 /**
231 * Set the appropriate URL on the request based on the location header.
232 *
233 * @param RequestInterface $request
234 * @param ResponseInterface $response
235 * @param array $protocols
236 *
237 * @return UriInterface
238 */
239 private static function redirectUri(
240 RequestInterface $request,
241 ResponseInterface $response,
242 array $protocols
243 ) {
244 $location = Psr7\UriResolver::resolve(
245 $request->getUri(),
246 new Psr7\Uri($response->getHeaderLine('Location'))
247 );
248
249 // Ensure that the redirect URI is allowed based on the protocols.
250 if (!in_array($location->getScheme(), $protocols)) {
251 throw new BadResponseException(
252 sprintf(
253 'Redirect URI, %s, does not use one of the allowed redirect protocols: %s',
254 $location,
255 implode(', ', $protocols)
256 ),
257 $request,
258 $response
259 );
260 }
261
262 return $location;
263 }
264 }
265