| @@ -1,9 +1,14 @@ | ||
| 1 | 1 | <?php |
| 2 | +/** | |
| 3 | + * ActivityPub HTTP Class. | |
| 4 | + * | |
| 5 | + * @package Activitypub | |
| 6 | + */ | |
| 7 | + | |
| 2 | 8 | namespace Activitypub; |
| 3 | 9 | |
| 4 | -use WP_Error; | |
| 5 | -use Activitypub\Collection\Users; | |
| 10 | +use Activitypub\Collection\Actors; | |
| 6 | 11 | |
| 7 | 12 | /** |
| 8 | 13 | * ActivityPub HTTP Class |
| 9 | 14 | * |
| @@ -12,42 +17,59 @@ | ||
| 12 | 17 | class Http { |
| 13 | 18 | /** |
| 14 | 19 | * Send a POST Request with the needed HTTP Headers |
| 15 | 20 | * |
| 16 | - * @param string $url The URL endpoint | |
| 17 | - * @param string $body The Post Body | |
| 18 | - * @param int $user_id The WordPress User-ID | |
| 21 | + * @param string $url The URL endpoint. | |
| 22 | + * @param string $body The Post Body. | |
| 23 | + * @param int|null $user_id The WordPress User-ID, or null to sign with the Application key. | |
| 19 | 24 | * |
| 20 | - * @return array|WP_Error The POST Response or an WP_ERROR | |
| 25 | + * @return array|\WP_Error The POST Response or an WP_Error. | |
| 21 | 26 | */ |
| 22 | 27 | public static function post( $url, $body, $user_id ) { |
| 28 | + /** | |
| 29 | + * Fires before an HTTP POST request is made. | |
| 30 | + * | |
| 31 | + * @param string $url The URL endpoint. | |
| 32 | + * @param string $body The POST body. | |
| 33 | + * @param int|null $user_id The WordPress User ID, or null when signing with the Application key. | |
| 34 | + */ | |
| 23 | 35 | \do_action( 'activitypub_pre_http_post', $url, $body, $user_id ); |
| 24 | 36 | |
| 25 | - $date = \gmdate( 'D, d M Y H:i:s T' ); | |
| 26 | - $digest = Signature::generate_digest( $body ); | |
| 27 | - $signature = Signature::generate_signature( $user_id, 'post', $url, $date, $digest ); | |
| 37 | + /** | |
| 38 | + * Filters the HTTP headers user agent string. | |
| 39 | + * | |
| 40 | + * @param string $user_agent The user agent string. | |
| 41 | + * @param string $url The request URL. | |
| 42 | + */ | |
| 43 | + $user_agent = \apply_filters( 'http_headers_useragent', 'WordPress/' . get_masked_wp_version() . '; ' . \get_bloginfo( 'url' ), $url ); | |
| 28 | 44 | |
| 29 | - $wp_version = \get_bloginfo( 'version' ); | |
| 30 | - | |
| 31 | 45 | /** |
| 32 | - * Filter the HTTP headers user agent. | |
| 46 | + * Filters the timeout duration for remote POST requests in ActivityPub. | |
| 33 | 47 | * |
| 34 | - * @param string $user_agent The user agent string. | |
| 48 | + * @param int $timeout The timeout value in seconds. Default 10 seconds. | |
| 35 | 49 | */ |
| 36 | - $user_agent = \apply_filters( 'http_headers_useragent', 'WordPress/' . $wp_version . '; ' . \get_bloginfo( 'url' ) ); | |
| 50 | + $timeout = \apply_filters( 'activitypub_remote_post_timeout', 10 ); | |
| 51 | + | |
| 52 | + /* | |
| 53 | + * Get the private key for signing the request. If a user ID is provided, | |
| 54 | + * get the user's private key; otherwise, use the application's private key. | |
| 55 | + */ | |
| 56 | + $private_key = null === $user_id ? Application::get_private_key() : Actors::get_private_key( $user_id ); | |
| 57 | + | |
| 37 | 58 | $args = array( |
| 38 | - 'timeout' => 100, | |
| 59 | + 'timeout' => $timeout, | |
| 39 | 60 | 'limit_response_size' => 1048576, |
| 40 | - 'redirection' => 3, | |
| 41 | - 'user-agent' => "$user_agent; ActivityPub", | |
| 42 | - 'headers' => array( | |
| 43 | - 'Accept' => 'application/activity+json', | |
| 61 | + 'redirection' => 3, | |
| 62 | + 'user-agent' => "$user_agent; ActivityPub", | |
| 63 | + 'headers' => array( | |
| 64 | + 'Accept' => 'application/activity+json', | |
| 44 | 65 | 'Content-Type' => 'application/activity+json', |
| 45 | - 'Digest' => $digest, | |
| 46 | - 'Signature' => $signature, | |
| 47 | - 'Date' => $date, | |
| 66 | + 'Date' => \gmdate( 'D, d M Y H:i:s T' ), | |
| 48 | 67 | ), |
| 49 | - 'body' => $body, | |
| 68 | + 'body' => $body, | |
| 69 | + 'key_id' => \json_decode( $body )->actor . '#main-key', | |
| 70 | + 'private_key' => $private_key, | |
| 71 | + 'user_id' => $user_id, | |
| 50 | 72 | ); |
| 51 | 73 | |
| 52 | 74 | $response = \wp_safe_remote_post( $url, $args ); |
| 53 | 75 | $code = \wp_remote_retrieve_response_code( $response ); |
| @@ -52,11 +74,26 @@ | ||
| 52 | 74 | $response = \wp_safe_remote_post( $url, $args ); |
| 53 | 75 | $code = \wp_remote_retrieve_response_code( $response ); |
| 54 | 76 | |
| 55 | 77 | if ( $code >= 400 ) { |
| 56 | - $response = new WP_Error( $code, __( 'Failed HTTP Request', 'activitypub' ), array( 'status' => $code ) ); | |
| 78 | + $response = new \WP_Error( | |
| 79 | + $code, | |
| 80 | + \__( 'Failed HTTP Request', 'activitypub' ), | |
| 81 | + array( | |
| 82 | + 'status' => $code, | |
| 83 | + 'response' => $response, | |
| 84 | + ) | |
| 85 | + ); | |
| 57 | 86 | } |
| 58 | 87 | |
| 88 | + /** | |
| 89 | + * Action to save the response of the remote POST request. | |
| 90 | + * | |
| 91 | + * @param array|\WP_Error $response The response of the remote POST request. | |
| 92 | + * @param string $url The URL endpoint. | |
| 93 | + * @param string $body The Post Body. | |
| 94 | + * @param int|null $user_id The WordPress User-ID, or null when signing with the Application key. | |
| 95 | + */ | |
| 59 | 96 | \do_action( 'activitypub_safe_remote_post_response', $response, $url, $body, $user_id ); |
| 60 | 97 | |
| 61 | 98 | return $response; |
| 62 | 99 | } |
| @@ -61,52 +98,152 @@ | ||
| 61 | 98 | return $response; |
| 62 | 99 | } |
| 63 | 100 | |
| 64 | 101 | /** |
| 65 | - * Send a GET Request with the needed HTTP Headers | |
| 102 | + * Send a GET Request with the needed HTTP Headers. | |
| 66 | 103 | * |
| 67 | - * @param string $url The URL endpoint | |
| 68 | - * @param int $user_id The WordPress User-ID | |
| 104 | + * @param string $url The URL endpoint. | |
| 105 | + * @param array $args Optional. Additional arguments to customize the request. | |
| 106 | + * - 'headers': Array of headers to override defaults. | |
| 107 | + * @param bool|int $cached Optional. Whether to cache the response, or the cache duration in seconds for | |
| 108 | + * successful responses. Failed responses use a fixed short backoff duration. Default false. | |
| 69 | 109 | * |
| 70 | - * @return array|WP_Error The GET Response or an WP_ERROR | |
| 110 | + * @return array|\WP_Error The GET Response or a WP_Error. | |
| 71 | 111 | */ |
| 72 | - public static function get( $url ) { | |
| 112 | + public static function get( $url, $args = array(), $cached = false ) { | |
| 113 | + // Backward compatibility: if $args is boolean/int, it's the old $cached parameter. | |
| 114 | + if ( ! \is_array( $args ) ) { | |
| 115 | + \_deprecated_argument( | |
| 116 | + __METHOD__, | |
| 117 | + '7.9.0', | |
| 118 | + \esc_html__( 'The $cached parameter should now be passed as the third argument.', 'activitypub' ) | |
| 119 | + ); | |
| 120 | + $cached = $args; | |
| 121 | + $args = array(); | |
| 122 | + } | |
| 123 | + | |
| 124 | + /** | |
| 125 | + * Fires before an HTTP GET request is made. | |
| 126 | + * | |
| 127 | + * @param string $url The URL endpoint. | |
| 128 | + */ | |
| 73 | 129 | \do_action( 'activitypub_pre_http_get', $url ); |
| 74 | 130 | |
| 75 | - $date = \gmdate( 'D, d M Y H:i:s T' ); | |
| 76 | - $signature = Signature::generate_signature( Users::APPLICATION_USER_ID, 'get', $url, $date ); | |
| 131 | + $transient_key = self::generate_cache_key( $url ); | |
| 77 | 132 | |
| 78 | - $wp_version = \get_bloginfo( 'version' ); | |
| 133 | + // Check cache only if caching is requested. | |
| 134 | + if ( $cached ) { | |
| 135 | + $response = \get_transient( $transient_key ); | |
| 79 | 136 | |
| 137 | + if ( $response ) { | |
| 138 | + /** | |
| 139 | + * Action to save the response of the remote GET request. | |
| 140 | + * | |
| 141 | + * @param array|\WP_Error $response The response of the remote GET request. | |
| 142 | + * @param string $url The URL endpoint. | |
| 143 | + */ | |
| 144 | + \do_action( 'activitypub_safe_remote_get_response', $response, $url ); | |
| 145 | + | |
| 146 | + return $response; | |
| 147 | + } | |
| 148 | + } | |
| 149 | + | |
| 80 | 150 | /** |
| 81 | - * Filter the HTTP headers user agent. | |
| 151 | + * Filters the HTTP headers user agent string. | |
| 82 | 152 | * |
| 83 | 153 | * @param string $user_agent The user agent string. |
| 154 | + * @param string $url The request URL. | |
| 84 | 155 | */ |
| 85 | - $user_agent = \apply_filters( 'http_headers_useragent', 'WordPress/' . $wp_version . '; ' . \get_bloginfo( 'url' ) ); | |
| 156 | + $user_agent = \apply_filters( 'http_headers_useragent', 'WordPress/' . get_masked_wp_version() . '; ' . \get_bloginfo( 'url' ), $url ); | |
| 86 | 157 | |
| 87 | - $args = array( | |
| 88 | - 'timeout' => apply_filters( 'activitypub_remote_get_timeout', 100 ), | |
| 158 | + /** | |
| 159 | + * Filters the timeout duration for remote GET requests in ActivityPub. | |
| 160 | + * | |
| 161 | + * @param int $timeout The timeout value in seconds. Default 10 seconds. | |
| 162 | + */ | |
| 163 | + $timeout = \apply_filters( 'activitypub_remote_get_timeout', 10 ); | |
| 164 | + | |
| 165 | + $defaults = array( | |
| 166 | + 'timeout' => $timeout, | |
| 89 | 167 | 'limit_response_size' => 1048576, |
| 90 | - 'redirection' => 3, | |
| 91 | - 'user-agent' => "$user_agent; ActivityPub", | |
| 92 | - 'headers' => array( | |
| 93 | - 'Accept' => 'application/activity+json', | |
| 168 | + 'redirection' => 3, | |
| 169 | + 'user-agent' => "$user_agent; ActivityPub", | |
| 170 | + 'headers' => array( | |
| 171 | + 'Accept' => 'application/activity+json', | |
| 94 | 172 | 'Content-Type' => 'application/activity+json', |
| 95 | - 'Signature' => $signature, | |
| 96 | - 'Date' => $date, | |
| 173 | + 'Date' => \gmdate( 'D, d M Y H:i:s T' ), | |
| 97 | 174 | ), |
| 175 | + 'key_id' => Application::get_key_id(), | |
| 176 | + 'private_key' => Application::get_private_key(), | |
| 98 | 177 | ); |
| 99 | 178 | |
| 179 | + $args = \wp_parse_args( $args, $defaults ); | |
| 180 | + $args['headers'] = \wp_parse_args( $args['headers'], $defaults['headers'] ); | |
| 181 | + | |
| 100 | 182 | $response = \wp_safe_remote_get( $url, $args ); |
| 101 | 183 | $code = \wp_remote_retrieve_response_code( $response ); |
| 102 | 184 | |
| 103 | - if ( $code >= 400 ) { | |
| 104 | - $response = new WP_Error( $code, __( 'Failed HTTP Request', 'activitypub' ), array( 'status' => $code ) ); | |
| 185 | + if ( \is_wp_error( $response ) || $code >= 400 ) { | |
| 186 | + // Capture the served-from URL before $response is replaced by the error below. | |
| 187 | + $effective_url = \is_wp_error( $response ) ? '' : self::effective_url( $response ); | |
| 188 | + | |
| 189 | + if ( ! $code ) { | |
| 190 | + $code = 0; | |
| 191 | + } | |
| 192 | + $response = new \WP_Error( $code, \__( 'Failed HTTP Request', 'activitypub' ), array( 'status' => $code ) ); | |
| 193 | + | |
| 194 | + /* | |
| 195 | + * Cache errors to prevent repeated timeout waits, but never one reached via a | |
| 196 | + * cross-host redirect: cached under the requested URL's key, a one-off open | |
| 197 | + * redirect on the requested host would let a transient 4xx be replayed as a | |
| 198 | + * repeatable federation outage (the same caching concern as the success path | |
| 199 | + * below, just with a WP_Error instead of a document). | |
| 200 | + * | |
| 201 | + * - Retriable errors (timeouts, 5xx): 1 minute (server may recover quickly). | |
| 202 | + * - Other errors (4xx): 15 minutes (client errors are more permanent). | |
| 203 | + */ | |
| 204 | + if ( $cached && ( ! $effective_url || is_same_host( $url, $effective_url ) ) ) { | |
| 205 | + if ( \in_array( $code, ACTIVITYPUB_RETRY_ERROR_CODES, true ) || 0 === $code ) { | |
| 206 | + $cache_duration = MINUTE_IN_SECONDS; | |
| 207 | + } else { | |
| 208 | + $cache_duration = 15 * MINUTE_IN_SECONDS; | |
| 209 | + } | |
| 210 | + | |
| 211 | + \set_transient( $transient_key, $response, $cache_duration ); | |
| 212 | + } | |
| 213 | + | |
| 214 | + return $response; | |
| 105 | 215 | } |
| 106 | 216 | |
| 217 | + /** | |
| 218 | + * Action to save the response of the remote GET request. | |
| 219 | + * | |
| 220 | + * @param array|\WP_Error $response The response of the remote GET request. | |
| 221 | + * @param string $url The URL endpoint. | |
| 222 | + */ | |
| 107 | 223 | \do_action( 'activitypub_safe_remote_get_response', $response, $url ); |
| 108 | 224 | |
| 225 | + /* | |
| 226 | + * Never persist a response that was redirected to a different host. The cache | |
| 227 | + * is keyed on the requested URL, so caching cross-origin content under that key | |
| 228 | + * would let a one-off open redirect on the requested host durably associate the | |
| 229 | + * other host's document with that URL — a later lookup (e.g. a public-key fetch) | |
| 230 | + * would then return it. Same-host redirects (e.g. http→https) stay cacheable. | |
| 231 | + */ | |
| 232 | + $effective_url = self::effective_url( $response ); | |
| 233 | + if ( $effective_url && ! is_same_host( $url, $effective_url ) ) { | |
| 234 | + return $response; | |
| 235 | + } | |
| 236 | + | |
| 237 | + // Cache successful responses when caching is requested. | |
| 238 | + if ( $cached ) { | |
| 239 | + $cache_duration = $cached; | |
| 240 | + if ( ! \is_int( $cache_duration ) ) { | |
| 241 | + $cache_duration = HOUR_IN_SECONDS; | |
| 242 | + } | |
| 243 | + \set_transient( $transient_key, $response, $cache_duration ); | |
| 244 | + } | |
| 245 | + | |
| 109 | 246 | return $response; |
| 110 | 247 | } |
| 111 | 248 | |
| 112 | 249 | /** |
| @@ -116,16 +253,196 @@ | ||
| 116 | 253 | * |
| 117 | 254 | * @return bool True if the URL is a tombstone. |
| 118 | 255 | */ |
| 119 | 256 | public static function is_tombstone( $url ) { |
| 120 | - \do_action( 'activitypub_pre_http_is_tombstone', $url ); | |
| 257 | + \_deprecated_function( __METHOD__, '7.3.0', 'Activitypub\Tombstone::exists_remote' ); | |
| 121 | 258 | |
| 122 | - $response = \wp_safe_remote_get( $url ); | |
| 123 | - $code = \wp_remote_retrieve_response_code( $response ); | |
| 259 | + return Tombstone::exists_remote( $url ); | |
| 260 | + } | |
| 124 | 261 | |
| 125 | - if ( in_array( (int) $code, array( 404, 410 ), true ) ) { | |
| 126 | - return true; | |
| 262 | + /** | |
| 263 | + * Generate a cache key for the URL. | |
| 264 | + * | |
| 265 | + * @param string $url The URL to generate the cache key for. | |
| 266 | + * | |
| 267 | + * @return string The cache key. | |
| 268 | + */ | |
| 269 | + public static function generate_cache_key( $url ) { | |
| 270 | + return 'activitypub_http_' . \md5( $url ); | |
| 271 | + } | |
| 272 | + | |
| 273 | + /** | |
| 274 | + * Requests the Data from the Object-URL or Object-Array. | |
| 275 | + * | |
| 276 | + * Fetched objects are self-confirmed before they are returned, the same way | |
| 277 | + * Mastodon's `JsonLdHelper#fetch_resource` works: an object is trusted only when | |
| 278 | + * its own `id` is the URL it was actually served from (after any redirects). If | |
| 279 | + * the document served at the requested URL declares a different `id`, that id is | |
| 280 | + * dereferenced from its own host and accepted only when it self-confirms. This | |
| 281 | + * makes every caller safe to cache the result under its `id` — one host can never | |
| 282 | + * serve an object (and its public key) under another host's id — without each | |
| 283 | + * caller having to re-check the origin itself. | |
| 284 | + * | |
| 285 | + * @param array|string $url_or_object The Object or the Object URL. | |
| 286 | + * @param bool $cached Optional. Whether the result should be cached. Default true. | |
| 287 | + * | |
| 288 | + * @return array|\WP_Error The Object data as array or WP_Error on failure. | |
| 289 | + */ | |
| 290 | + public static function get_remote_object( $url_or_object, $cached = true ) { | |
| 291 | + /** | |
| 292 | + * Filters the preemptive return value of a remote object request. | |
| 293 | + * | |
| 294 | + * This is an explicit in-process override (used for caching and tests), not | |
| 295 | + * untrusted network data, so it is returned as-is without self-confirmation. | |
| 296 | + * | |
| 297 | + * @param array|string|null $response The response. | |
| 298 | + * @param array|string|null $url_or_object The Object or the Object URL. | |
| 299 | + */ | |
| 300 | + $response = \apply_filters( 'activitypub_pre_http_get_remote_object', null, $url_or_object ); | |
| 301 | + if ( null !== $response ) { | |
| 302 | + return $response; | |
| 127 | 303 | } |
| 128 | 304 | |
| 129 | - return false; | |
| 305 | + $url = object_to_uri( $url_or_object ); | |
| 306 | + | |
| 307 | + if ( Webfinger::is_acct( $url ) ) { | |
| 308 | + $url = Webfinger::resolve( $url ); | |
| 309 | + } | |
| 310 | + | |
| 311 | + if ( ! $url ) { | |
| 312 | + return new \WP_Error( | |
| 313 | + 'activitypub_no_valid_actor_identifier', | |
| 314 | + \__( 'The "actor" identifier is not valid', 'activitypub' ), | |
| 315 | + array( | |
| 316 | + 'status' => 404, | |
| 317 | + 'object' => $url, | |
| 318 | + ) | |
| 319 | + ); | |
| 320 | + } | |
| 321 | + | |
| 322 | + if ( \is_wp_error( $url ) ) { | |
| 323 | + return $url; | |
| 324 | + } | |
| 325 | + | |
| 326 | + $final_url = ''; | |
| 327 | + $object = self::fetch_object( $url, $cached, $final_url ); | |
| 328 | + | |
| 329 | + if ( \is_wp_error( $object ) ) { | |
| 330 | + return $object; | |
| 331 | + } | |
| 332 | + | |
| 333 | + // Trust the document when it is served under its own id (after redirects). | |
| 334 | + if ( id_matches_url( $object, $final_url ) ) { | |
| 335 | + return $object; | |
| 336 | + } | |
| 337 | + | |
| 338 | + $declared_id = isset( $object['id'] ) && \is_string( $object['id'] ) ? $object['id'] : ''; | |
| 339 | + | |
| 340 | + /* | |
| 341 | + * An id-less object cannot be cached under an id, so it cannot be written | |
| 342 | + * under another id in an id-keyed cache. Return the document as served. | |
| 343 | + */ | |
| 344 | + if ( '' === $declared_id ) { | |
| 345 | + return $object; | |
| 346 | + } | |
| 347 | + | |
| 348 | + // Re-fetch the declared id from its own host and require it to self-confirm. One hop only. | |
| 349 | + $object = self::fetch_object( $declared_id, $cached, $final_url ); | |
| 350 | + | |
| 351 | + if ( \is_wp_error( $object ) ) { | |
| 352 | + return $object; | |
| 353 | + } | |
| 354 | + | |
| 355 | + if ( ! id_matches_url( $object, $final_url ) ) { | |
| 356 | + return new \WP_Error( | |
| 357 | + 'activitypub_object_id_mismatch', | |
| 358 | + \__( 'The object id does not match the URL it was served from', 'activitypub' ), | |
| 359 | + array( 'status' => 400 ) | |
| 360 | + ); | |
| 361 | + } | |
| 362 | + | |
| 363 | + return $object; | |
| 364 | + } | |
| 365 | + | |
| 366 | + /** | |
| 367 | + * Fetch and JSON-decode a single remote document. | |
| 368 | + * | |
| 369 | + * @param string $url The URL to fetch. Must already be resolved (not a WebFinger acct). | |
| 370 | + * @param bool $cached Whether the result may be served from and written to cache. | |
| 371 | + * @param string $final_url Filled by reference with the URL the document was served from, | |
| 372 | + * after following any redirects. | |
| 373 | + * | |
| 374 | + * @return array|\WP_Error The decoded document, or WP_Error on failure. | |
| 375 | + */ | |
| 376 | + private static function fetch_object( $url, $cached, &$final_url ) { | |
| 377 | + $final_url = $url; | |
| 378 | + | |
| 379 | + if ( ! \wp_http_validate_url( $url ) ) { | |
| 380 | + return new \WP_Error( | |
| 381 | + 'activitypub_no_valid_object_url', | |
| 382 | + \__( 'The "object" is/has no valid URL', 'activitypub' ), | |
| 383 | + array( | |
| 384 | + 'status' => 400, | |
| 385 | + 'object' => $url, | |
| 386 | + ) | |
| 387 | + ); | |
| 388 | + } | |
| 389 | + | |
| 390 | + $response = self::get( $url, array(), $cached ); | |
| 391 | + | |
| 392 | + if ( \is_wp_error( $response ) ) { | |
| 393 | + return $response; | |
| 394 | + } | |
| 395 | + | |
| 396 | + $effective_url = self::effective_url( $response ); | |
| 397 | + if ( $effective_url ) { | |
| 398 | + $final_url = $effective_url; | |
| 399 | + } | |
| 400 | + | |
| 401 | + $data = \json_decode( \wp_remote_retrieve_body( $response ), true ); | |
| 402 | + | |
| 403 | + if ( ! $data ) { | |
| 404 | + return new \WP_Error( | |
| 405 | + 'activitypub_invalid_json', | |
| 406 | + \__( 'No valid JSON data', 'activitypub' ), | |
| 407 | + array( | |
| 408 | + 'status' => 400, | |
| 409 | + 'object' => $url, | |
| 410 | + ) | |
| 411 | + ); | |
| 412 | + } | |
| 413 | + | |
| 414 | + return $data; | |
| 415 | + } | |
| 416 | + | |
| 417 | + /** | |
| 418 | + * Extract the effective URL a response was served from, after redirects. | |
| 419 | + * | |
| 420 | + * WordPress follows redirects transparently and exposes the final URL only on | |
| 421 | + * the underlying Requests response object. Returns an empty string when the URL | |
| 422 | + * cannot be determined, so callers fall back to the URL they requested. | |
| 423 | + * | |
| 424 | + * SECURITY: the redirect protections that build on this (the self-confirmation in | |
| 425 | + * get_remote_object() and the cross-host cache skip in get()) fail OPEN when this | |
| 426 | + * returns an empty string — self-confirmation then compares against the requested | |
| 427 | + * URL, which a redirect could have bounced away from. This relies on the internal | |
| 428 | + * `http_response` → Requests response `url` shape; if a future WordPress release | |
| 429 | + * changes it, re-verify that this still returns the post-redirect URL. | |
| 430 | + * | |
| 431 | + * @param array $response A `wp_remote_get()` response array. | |
| 432 | + * | |
| 433 | + * @return string The final URL, or an empty string when unavailable. | |
| 434 | + */ | |
| 435 | + private static function effective_url( $response ) { | |
| 436 | + if ( empty( $response['http_response'] ) || ! \is_object( $response['http_response'] ) ) { | |
| 437 | + return ''; | |
| 438 | + } | |
| 439 | + | |
| 440 | + $requests_response = $response['http_response']->get_response_object(); | |
| 441 | + | |
| 442 | + if ( ! \is_object( $requests_response ) || empty( $requests_response->url ) ) { | |
| 443 | + return ''; | |
| 444 | + } | |
| 445 | + | |
| 446 | + return (string) $requests_response->url; | |
| 130 | 447 | } |
| 131 | 448 | } |
