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| 1 | <?php |
| 2 | /** |
| 3 | * @license GPL-2.0-or-later |
| 4 | * @file |
| 5 | * @ingroup Hooks |
| 6 | * @defgroup Hooks Hooks |
| 7 | * Hooks allow custom code to be executed when an event occurs; this module |
| 8 | * includes all hooks provided by MediaWiki Core; for more information, see |
| 9 | * https://www.mediawiki.org/wiki/Manual:Hooks. |
| 10 | */ |
| 11 | |
| 12 | namespace MediaWiki\HookContainer; |
| 13 | |
| 14 | use Closure; |
| 15 | use Error; |
| 16 | use InvalidArgumentException; |
| 17 | use LogicException; |
| 18 | use MediaWiki\Debug\MWDebug; |
| 19 | use ReflectionFunction; |
| 20 | use UnexpectedValueException; |
| 21 | use Wikimedia\Assert\Assert; |
| 22 | use Wikimedia\NonSerializable\NonSerializableTrait; |
| 23 | use Wikimedia\ObjectFactory\ObjectFactory; |
| 24 | use Wikimedia\ScopedCallback; |
| 25 | use Wikimedia\Services\SalvageableService; |
| 26 | use function array_filter; |
| 27 | use function array_keys; |
| 28 | use function array_merge; |
| 29 | use function array_unique; |
| 30 | use function is_array; |
| 31 | use function is_object; |
| 32 | use function is_string; |
| 33 | use function strtr; |
| 34 | |
| 35 | /** |
| 36 | * HookContainer class. |
| 37 | * |
| 38 | * Main class for managing hooks |
| 39 | * |
| 40 | * @since 1.35 |
| 41 | */ |
| 42 | class HookContainer implements SalvageableService { |
| 43 | use NonSerializableTrait; |
| 44 | |
| 45 | public const NOOP = '*no-op*'; |
| 46 | |
| 47 | /** |
| 48 | * Normalized hook handlers, as a 3D array: |
| 49 | * - the first level maps hook names to lists of handlers |
| 50 | * - the second is a list of handlers |
| 51 | * - each handler is an associative array with some well known keys, as returned by normalizeHandler() |
| 52 | * @var array<array> |
| 53 | * @phan-var array<string,array<string|int,array{callback:callable,functionName:string}>> |
| 54 | */ |
| 55 | private $handlers = []; |
| 56 | |
| 57 | /** @var array<object> handler name and their handler objects */ |
| 58 | private $handlerObjects = []; |
| 59 | |
| 60 | /** |
| 61 | * Handlers registered by calling register(). |
| 62 | * @var array |
| 63 | */ |
| 64 | private $extraHandlers = []; |
| 65 | |
| 66 | /** @var int The next ID to be used by scopedRegister() */ |
| 67 | private $nextScopedRegisterId = 0; |
| 68 | |
| 69 | public function __construct( |
| 70 | private readonly HookRegistry $hookRegistry, |
| 71 | private readonly ObjectFactory $objectFactory, |
| 72 | ) { |
| 73 | } |
| 74 | |
| 75 | /** |
| 76 | * Salvage the state of HookContainer by retaining existing handler objects |
| 77 | * and hooks registered via HookContainer::register(). Necessary in the event |
| 78 | * that MediaWikiServices::resetGlobalInstance() is called after hooks have already |
| 79 | * been registered. |
| 80 | * |
| 81 | * @param HookContainer|SalvageableService $other The object to salvage state from. $other be |
| 82 | * of type HookContainer |
| 83 | */ |
| 84 | public function salvage( SalvageableService $other ) { |
| 85 | Assert::parameterType( self::class, $other, '$other' ); |
| 86 | if ( $this->handlers || $this->handlerObjects || $this->extraHandlers ) { |
| 87 | throw new LogicException( 'salvage() must be called immediately after construction' ); |
| 88 | } |
| 89 | $this->handlerObjects = $other->handlerObjects; |
| 90 | $this->handlers = $other->handlers; |
| 91 | $this->extraHandlers = $other->extraHandlers; |
| 92 | } |
| 93 | |
| 94 | /** |
| 95 | * Call registered hook functions through either the legacy $wgHooks or extension.json |
| 96 | * |
| 97 | * For the given hook, fetch the array of handler objects and |
| 98 | * process them. Determine the proper callback for each hook and |
| 99 | * then call the actual hook using the appropriate arguments. |
| 100 | * Finally, process the return value and return/throw accordingly. |
| 101 | * |
| 102 | * @param string $hook Name of the hook |
| 103 | * @param array $args Arguments to pass to hook handler |
| 104 | * @param array $options options map: |
| 105 | * - abortable: (bool) If false, handlers will not be allowed to abort the call sequence. |
| 106 | * An exception will be raised if a handler returns anything other than true or null. |
| 107 | * - deprecatedVersion: (string) Version of MediaWiki this hook was deprecated in. For supporting |
| 108 | * Hooks::run() legacy $deprecatedVersion parameter. New core code should add deprecated |
| 109 | * hooks to the DeprecatedHooks::$deprecatedHooks array literal. New extension code should |
| 110 | * use the DeprecatedHooks attribute. |
| 111 | * - silent: (bool) If true, do not raise a deprecation warning |
| 112 | * - noServices: (bool) If true, do not allow hook handlers with service dependencies |
| 113 | * @return bool True if no handler aborted the hook |
| 114 | * @throws UnexpectedValueException if handlers return an invalid value |
| 115 | */ |
| 116 | public function run( string $hook, array $args = [], array $options = [] ): bool { |
| 117 | $checkDeprecation = isset( $options['deprecatedVersion'] ); |
| 118 | |
| 119 | $abortable = $options['abortable'] ?? true; |
| 120 | foreach ( $this->getHandlers( $hook, $options ) as $handler ) { |
| 121 | if ( $checkDeprecation ) { |
| 122 | $this->checkDeprecation( $hook, $handler, $options ); |
| 123 | } |
| 124 | |
| 125 | // Call the handler. |
| 126 | $callback = $handler['callback']; |
| 127 | $return = $callback( ...$args ); |
| 128 | |
| 129 | // Handler returned false, signal abort to caller |
| 130 | if ( $return === false ) { |
| 131 | if ( !$abortable ) { |
| 132 | throw new UnexpectedValueException( "Handler {$handler['functionName']}" . |
| 133 | " return false for unabortable $hook." ); |
| 134 | } |
| 135 | |
| 136 | return false; |
| 137 | } elseif ( $return !== null && $return !== true ) { |
| 138 | throw new UnexpectedValueException( |
| 139 | "Hook handlers can only return null or a boolean. Got an unexpected value from " . |
| 140 | "handler {$handler['functionName']} for $hook" ); |
| 141 | } |
| 142 | } |
| 143 | |
| 144 | return true; |
| 145 | } |
| 146 | |
| 147 | /** |
| 148 | * Clear handlers of the given hook. |
| 149 | * This is intended for use while testing and will fail if MW_PHPUNIT_TEST |
| 150 | * is not defined. |
| 151 | * |
| 152 | * @param string $hook Name of hook to clear |
| 153 | * |
| 154 | * @internal For testing only |
| 155 | * @codeCoverageIgnore |
| 156 | */ |
| 157 | public function clear( string $hook ): void { |
| 158 | if ( !defined( 'MW_PHPUNIT_TEST' ) ) { |
| 159 | throw new LogicException( 'Cannot reset hooks in operation.' ); |
| 160 | } |
| 161 | |
| 162 | $this->handlers[$hook] = []; |
| 163 | } |
| 164 | |
| 165 | /** |
| 166 | * Register hook and handler, allowing for easy removal. |
| 167 | * Intended for use in temporary registration e.g. testing |
| 168 | * |
| 169 | * @param string $hook Name of hook |
| 170 | * @param callable|string|array $handler Handler to attach |
| 171 | */ |
| 172 | #[\NoDiscard] |
| 173 | public function scopedRegister( string $hook, $handler ): ScopedCallback { |
| 174 | $handler = $this->normalizeHandler( $hook, $handler ); |
| 175 | if ( !$handler ) { |
| 176 | throw new InvalidArgumentException( 'Bad hook handler!' ); |
| 177 | } |
| 178 | |
| 179 | $this->checkDeprecation( $hook, $handler ); |
| 180 | |
| 181 | $id = 'TemporaryHook_' . $this->nextScopedRegisterId++; |
| 182 | |
| 183 | $this->getHandlers( $hook ); |
| 184 | |
| 185 | $this->handlers[$hook][$id] = $handler; |
| 186 | |
| 187 | return new ScopedCallback( function () use ( $hook, $id ) { |
| 188 | unset( $this->handlers[$hook][$id] ); |
| 189 | } ); |
| 190 | } |
| 191 | |
| 192 | /** |
| 193 | * Returns a callable array based on the handler specification provided. |
| 194 | * This will find the appropriate handler object to call a method on, |
| 195 | * This will find the appropriate handler object to call a method on, |
| 196 | * instantiating it if it doesn't exist yet. |
| 197 | * |
| 198 | * @param string $hook The name of the hook the handler was registered for |
| 199 | * @param array $handler A hook handler specification as given in an extension.json file. |
| 200 | * @param array $options Options to apply. If the 'noServices' option is set and the |
| 201 | * handler requires service injection, this method will throw an |
| 202 | * UnexpectedValueException. |
| 203 | * |
| 204 | * @return callable-array |
| 205 | */ |
| 206 | private function makeExtensionHandlerCallback( string $hook, array $handler, array $options = [] ): array { |
| 207 | $spec = $handler['handler']; |
| 208 | $name = $spec['name']; |
| 209 | |
| 210 | if ( |
| 211 | !empty( $options['noServices'] ) && ( |
| 212 | !empty( $spec['services'] ) || |
| 213 | !empty( $spec['optional_services'] ) |
| 214 | ) |
| 215 | ) { |
| 216 | throw new UnexpectedValueException( |
| 217 | "The handler for the hook $hook registered in " . |
| 218 | "{$handler['extensionPath']} has a service dependency, " . |
| 219 | "but this hook does not allow it." ); |
| 220 | } |
| 221 | |
| 222 | if ( !isset( $this->handlerObjects[$name] ) ) { |
| 223 | $this->handlerObjects[$name] = $this->objectFactory->createObject( $spec ); |
| 224 | } |
| 225 | |
| 226 | $obj = $this->handlerObjects[$name]; |
| 227 | $method = $this->getHookMethodName( $hook ); |
| 228 | |
| 229 | return [ $obj, $method ]; |
| 230 | } |
| 231 | |
| 232 | /** |
| 233 | * Normalize/clean up format of argument passed as hook handler |
| 234 | * |
| 235 | * @param string $hook Hook name |
| 236 | * @param string|callable|array{handler:array} $handler Executable handler function. See {@link self::register()} |
| 237 | * for supported structures. |
| 238 | * @param array $options see makeExtensionHandlerCallback() |
| 239 | * |
| 240 | * @return array|false |
| 241 | * - callback: (callable) Executable handler function |
| 242 | * - functionName: (string) Handler name for passing to wfDeprecated() or Exceptions thrown |
| 243 | * @phan-return array{callback:callable,functionName:string}|false |
| 244 | */ |
| 245 | private function normalizeHandler( string $hook, $handler, array $options = [] ) { |
| 246 | // 1 - Class instance with `on$hook` method. |
| 247 | if ( is_object( $handler ) && !$handler instanceof Closure ) { |
| 248 | $handler = [ $handler, $this->getHookMethodName( $hook ) ]; |
| 249 | } |
| 250 | |
| 251 | // 2 - No-op |
| 252 | if ( $handler === self::NOOP ) { |
| 253 | return [ |
| 254 | 'callback' => static function () { |
| 255 | // no-op |
| 256 | }, |
| 257 | 'functionName' => self::NOOP, |
| 258 | ]; |
| 259 | } |
| 260 | |
| 261 | // 3 - Plain callback |
| 262 | if ( self::mayBeCallable( $handler ) ) { |
| 263 | return [ |
| 264 | 'callback' => $handler, |
| 265 | 'functionName' => self::callableToString( $handler ), |
| 266 | ]; |
| 267 | } |
| 268 | |
| 269 | // 4 - ExtensionRegistry style handler |
| 270 | if ( is_array( $handler ) && !empty( $handler['handler'] ) ) { |
| 271 | // Skip hooks that both acknowledge deprecation and are deprecated in core |
| 272 | if ( $handler['deprecated'] ?? false ) { |
| 273 | $deprecatedHooks = $this->hookRegistry->getDeprecatedHooks(); |
| 274 | $deprecated = $deprecatedHooks->isHookDeprecated( $hook ); |
| 275 | if ( $deprecated ) { |
| 276 | return false; |
| 277 | } |
| 278 | } |
| 279 | |
| 280 | $callback = $this->makeExtensionHandlerCallback( $hook, $handler, $options ); |
| 281 | return [ |
| 282 | 'callback' => $callback, |
| 283 | 'functionName' => self::callableToString( $callback ), |
| 284 | ]; |
| 285 | } |
| 286 | |
| 287 | // Something invalid |
| 288 | return false; |
| 289 | } |
| 290 | |
| 291 | /** |
| 292 | * Return whether hook has any handlers registered to it. |
| 293 | * The function may have been registered via Hooks::register or in extension.json |
| 294 | * |
| 295 | * @param string $hook Name of hook |
| 296 | * @return bool Whether the hook has a handler registered to it |
| 297 | */ |
| 298 | public function isRegistered( string $hook ): bool { |
| 299 | return (bool)$this->getHandlers( $hook ); |
| 300 | } |
| 301 | |
| 302 | /** |
| 303 | * Attach an event handler to a given hook. |
| 304 | * |
| 305 | * The handler should be given in one of the following forms: |
| 306 | * |
| 307 | * 1) A callable (string, array, or closure) |
| 308 | * 2) An extension hook handler spec in the form returned by |
| 309 | * HookRegistry::getExtensionHooks |
| 310 | * 3) A class instance with an `on$hook` method (see {@link self::getHookMethodName} for normalizations applied) |
| 311 | * 4) {@link self::NOOP} as a no-op handler |
| 312 | * |
| 313 | * Several other forms are supported for backwards compatibility, but |
| 314 | * should not be used when calling this method directly. |
| 315 | * |
| 316 | * @note This method accepts "broken callables", that is, callable |
| 317 | * structures that reference classes that could not be found or could |
| 318 | * not be loaded, e.g. because they implement an interface that cannot |
| 319 | * be loaded. This situation may legitimately arise when implementing |
| 320 | * hooks defined by extensions that are not present. |
| 321 | * In that case, the hook will never fire and registering the "broken" |
| 322 | * handlers is harmless. If a broken hook handler is registered for a |
| 323 | * hook that is indeed called, it will cause an error. This is |
| 324 | * intentional: we don't want to silently ignore mistakes like mistyped |
| 325 | * class names in a hook handler registration. |
| 326 | * |
| 327 | * @param string $hook Name of hook |
| 328 | * @param string|array|callable $handler handler |
| 329 | */ |
| 330 | public function register( string $hook, $handler ) { |
| 331 | $this->checkDeprecation( $hook, $handler ); |
| 332 | |
| 333 | if ( !isset( $this->handlers[$hook] ) ) { |
| 334 | // Just remember the handler for later. |
| 335 | // NOTE: It would be nice to normalize immediately. But since some extensions make extensive |
| 336 | // use of this method for registering hooks on every call, that could be a performance |
| 337 | // issue. This is particularly true if the hook is declared in a way that would require |
| 338 | // service objects to be instantiated. |
| 339 | $this->extraHandlers[$hook][] = $handler; |
| 340 | return; |
| 341 | } |
| 342 | |
| 343 | $normalized = $this->normalizeHandler( $hook, $handler ); |
| 344 | if ( !$normalized ) { |
| 345 | throw new InvalidArgumentException( 'Bad hook handler!' ); |
| 346 | } |
| 347 | |
| 348 | $this->getHandlers( $hook ); |
| 349 | $this->handlers[$hook][] = $normalized; |
| 350 | } |
| 351 | |
| 352 | /** |
| 353 | * Get handler callbacks. |
| 354 | * |
| 355 | * @deprecated since 1.41. |
| 356 | * @internal For use by HookContainerTest. Delete when no longer needed. |
| 357 | * @param string $hook Name of hook |
| 358 | * @return callable[] |
| 359 | */ |
| 360 | public function getHandlerCallbacks( string $hook ): array { |
| 361 | wfDeprecated( __METHOD__, '1.41' ); |
| 362 | $handlers = $this->getHandlers( $hook ); |
| 363 | return array_column( $handlers, 'callback' ); |
| 364 | } |
| 365 | |
| 366 | /** |
| 367 | * Returns the names of all hooks that have at least one handler registered. |
| 368 | * @return string[] |
| 369 | */ |
| 370 | public function getHookNames(): array { |
| 371 | $names = array_merge( |
| 372 | array_keys( array_filter( $this->handlers ) ), |
| 373 | array_keys( array_filter( $this->extraHandlers ) ), |
| 374 | array_keys( array_filter( $this->hookRegistry->getGlobalHooks() ) ), |
| 375 | array_keys( array_filter( $this->hookRegistry->getExtensionHooks() ) ) |
| 376 | ); |
| 377 | |
| 378 | return array_unique( $names ); |
| 379 | } |
| 380 | |
| 381 | /** |
| 382 | * Return the array of handlers for the given hook. |
| 383 | * |
| 384 | * @param string $hook Name of the hook |
| 385 | * @param array $options Handler options, which may include: |
| 386 | * - noServices: Do not allow hook handlers with service dependencies |
| 387 | * @return array[] A list of handler entries |
| 388 | * @phan-return array<string|int,array{callback:callable,functionName:string}> |
| 389 | */ |
| 390 | private function getHandlers( string $hook, array $options = [] ): array { |
| 391 | if ( !isset( $this->handlers[$hook] ) ) { |
| 392 | $handlers = []; |
| 393 | $registeredHooks = $this->hookRegistry->getExtensionHooks(); |
| 394 | $configuredHooks = $this->hookRegistry->getGlobalHooks(); |
| 395 | |
| 396 | $rawHandlers = array_merge( |
| 397 | $configuredHooks[ $hook ] ?? [], |
| 398 | $registeredHooks[ $hook ] ?? [], |
| 399 | $this->extraHandlers[ $hook ] ?? [], |
| 400 | ); |
| 401 | |
| 402 | foreach ( $rawHandlers as $raw ) { |
| 403 | $handler = $this->normalizeHandler( $hook, $raw, $options ); |
| 404 | if ( !$handler ) { |
| 405 | // XXX: log this?! |
| 406 | // NOTE: also happens for deprecated hooks, which is fine! |
| 407 | continue; |
| 408 | } |
| 409 | |
| 410 | $handlers[] = $handler; |
| 411 | } |
| 412 | |
| 413 | $this->handlers[ $hook ] = $handlers; |
| 414 | } |
| 415 | |
| 416 | return $this->handlers[ $hook ]; |
| 417 | } |
| 418 | |
| 419 | /** |
| 420 | * Return the array of strings that describe the handler registered with the given hook. |
| 421 | * |
| 422 | * @internal Only public for use by ApiQuerySiteInfo.php and SpecialVersion.php |
| 423 | * @param string $hook Name of the hook |
| 424 | * @return string[] A list of handler descriptions |
| 425 | */ |
| 426 | public function getHandlerDescriptions( string $hook ): array { |
| 427 | $descriptions = []; |
| 428 | |
| 429 | if ( isset( $this->handlers[ $hook ] ) ) { |
| 430 | $rawHandlers = $this->handlers[ $hook ]; |
| 431 | } else { |
| 432 | $registeredHooks = $this->hookRegistry->getExtensionHooks(); |
| 433 | $configuredHooks = $this->hookRegistry->getGlobalHooks(); |
| 434 | |
| 435 | $rawHandlers = array_merge( |
| 436 | $configuredHooks[ $hook ] ?? [], |
| 437 | $registeredHooks[ $hook ] ?? [], |
| 438 | $this->extraHandlers[ $hook ] ?? [], |
| 439 | ); |
| 440 | } |
| 441 | |
| 442 | foreach ( $rawHandlers as $raw ) { |
| 443 | $descr = $this->describeHandler( $hook, $raw ); |
| 444 | |
| 445 | if ( $descr ) { |
| 446 | $descriptions[] = $descr; |
| 447 | } |
| 448 | } |
| 449 | |
| 450 | return $descriptions; |
| 451 | } |
| 452 | |
| 453 | /** |
| 454 | * Returns a human-readable description of the given handler. |
| 455 | * |
| 456 | * @param string $hook |
| 457 | * @param string|array|callable $handler |
| 458 | * |
| 459 | * @return ?string |
| 460 | */ |
| 461 | private function describeHandler( string $hook, $handler ): ?string { |
| 462 | if ( is_array( $handler ) ) { |
| 463 | // already normalized |
| 464 | if ( isset( $handler['functionName'] ) ) { |
| 465 | return $handler['functionName']; |
| 466 | } |
| 467 | |
| 468 | if ( isset( $handler['callback'] ) ) { |
| 469 | return self::callableToString( $handler['callback'] ); |
| 470 | } |
| 471 | |
| 472 | if ( isset( $handler['handler']['class'] ) ) { |
| 473 | // New style hook. Avoid instantiating the handler object |
| 474 | $method = $this->getHookMethodName( $hook ); |
| 475 | return $handler['handler']['class'] . '::' . $method; |
| 476 | } |
| 477 | } |
| 478 | |
| 479 | $handler = $this->normalizeHandler( $hook, $handler ); |
| 480 | return $handler ? $handler['functionName'] : null; |
| 481 | } |
| 482 | |
| 483 | /** |
| 484 | * For each hook handler of each hook, this will log a deprecation if: |
| 485 | * 1. the hook is marked deprecated and |
| 486 | * 2. the "silent" flag is absent or false, and |
| 487 | * 3. an extension registers a handler in the new way but does not acknowledge deprecation |
| 488 | */ |
| 489 | public function emitDeprecationWarnings() { |
| 490 | $deprecatedHooks = $this->hookRegistry->getDeprecatedHooks(); |
| 491 | $extensionHooks = $this->hookRegistry->getExtensionHooks(); |
| 492 | |
| 493 | foreach ( $extensionHooks as $name => $handlers ) { |
| 494 | if ( $deprecatedHooks->isHookDeprecated( $name ) ) { |
| 495 | $deprecationInfo = $deprecatedHooks->getDeprecationInfo( $name ); |
| 496 | if ( !empty( $deprecationInfo['silent'] ) ) { |
| 497 | continue; |
| 498 | } |
| 499 | $version = $deprecationInfo['deprecatedVersion'] ?? ''; |
| 500 | $component = $deprecationInfo['component'] ?? 'MediaWiki'; |
| 501 | foreach ( $handlers as $handler ) { |
| 502 | if ( !isset( $handler['deprecated'] ) || !$handler['deprecated'] ) { |
| 503 | MWDebug::sendRawDeprecated( |
| 504 | "Hook $name was deprecated in $component $version " . |
| 505 | "but is registered in " . $handler['extensionPath'] |
| 506 | ); |
| 507 | } |
| 508 | } |
| 509 | } |
| 510 | } |
| 511 | } |
| 512 | |
| 513 | /** |
| 514 | * Will trigger a deprecation warning if the given hook is deprecated and the deprecation |
| 515 | * is not marked as silent. |
| 516 | * |
| 517 | * @param string $hook The name of the hook. |
| 518 | * @param array|callable|string $handler A handler spec |
| 519 | * @param array|null $deprecationInfo Deprecation info if the caller already knows it. |
| 520 | * If not given, it will be looked up from the hook registry. |
| 521 | * |
| 522 | * @return void |
| 523 | */ |
| 524 | private function checkDeprecation( string $hook, $handler, ?array $deprecationInfo = null ): void { |
| 525 | if ( !$deprecationInfo ) { |
| 526 | $deprecatedHooks = $this->hookRegistry->getDeprecatedHooks(); |
| 527 | $deprecationInfo = $deprecatedHooks->getDeprecationInfo( $hook ); |
| 528 | } |
| 529 | |
| 530 | if ( $deprecationInfo && empty( $deprecationInfo['silent'] ) ) { |
| 531 | $description = $this->describeHandler( $hook, $handler ); |
| 532 | wfDeprecated( |
| 533 | "$hook hook (used in $description)", |
| 534 | $deprecationInfo['deprecatedVersion'] ?? false, |
| 535 | $deprecationInfo['component'] ?? false |
| 536 | ); |
| 537 | } |
| 538 | } |
| 539 | |
| 540 | /** |
| 541 | * Returns a human-readable representation of the given callable. |
| 542 | * |
| 543 | * @param callable $callable |
| 544 | * |
| 545 | * @return string |
| 546 | */ |
| 547 | private static function callableToString( $callable ): string { |
| 548 | if ( is_string( $callable ) ) { |
| 549 | return $callable; |
| 550 | } |
| 551 | |
| 552 | if ( $callable instanceof Closure ) { |
| 553 | $func = new ReflectionFunction( $callable ); |
| 554 | $cls = $func->getClosureCalledClass(); |
| 555 | if ( $func->getClosureThis() && $cls ) { |
| 556 | return "({$cls->getName()})->{$func->getName()}(...)"; |
| 557 | } elseif ( $cls ) { |
| 558 | return "{$cls->getName()}::{$func->getName()}(...)"; |
| 559 | } else { |
| 560 | return "{$func->getName()}(...)"; |
| 561 | } |
| 562 | } |
| 563 | |
| 564 | if ( is_array( $callable ) ) { |
| 565 | [ $on, $func ] = $callable; |
| 566 | |
| 567 | if ( is_object( $on ) ) { |
| 568 | $on = get_class( $on ); |
| 569 | } |
| 570 | |
| 571 | return "$on::$func"; |
| 572 | } |
| 573 | |
| 574 | throw new InvalidArgumentException( 'Unexpected kind of callable' ); |
| 575 | } |
| 576 | |
| 577 | /** |
| 578 | * Returns the default handler method name for the given hook. |
| 579 | * |
| 580 | * @param string $hook |
| 581 | * |
| 582 | * @return string |
| 583 | */ |
| 584 | private function getHookMethodName( string $hook ): string { |
| 585 | $hook = strtr( $hook, ':\\-', '___' ); |
| 586 | return "on$hook"; |
| 587 | } |
| 588 | |
| 589 | /** |
| 590 | * Replacement for is_callable that will also return true when the callable uses a class |
| 591 | * that cannot be loaded. |
| 592 | * |
| 593 | * This may legitimately happen when a hook handler uses a hook interfaces that is defined |
| 594 | * in another extension. In that case, the hook itself is also defined in the other extension, |
| 595 | * so the hook will never be called and no problem arises. |
| 596 | * |
| 597 | * However, it is entirely possible to register broken handlers for hooks that will indeed |
| 598 | * be called, causing an error. This is intentional: we don't want to silently ignore |
| 599 | * mistakes like mistyped class names in a hook handler registration. |
| 600 | * |
| 601 | * @param mixed $v |
| 602 | * |
| 603 | * @return bool |
| 604 | */ |
| 605 | private static function mayBeCallable( $v ): bool { |
| 606 | try { |
| 607 | return is_callable( $v ); |
| 608 | } catch ( Error $error ) { |
| 609 | // If the callable uses a class that can't be loaded because it extends an unknown base class. |
| 610 | // Continue as if is_callable had returned true, to allow the handler to be registered. |
| 611 | if ( preg_match( '/Class.*not found/', $error->getMessage() ) ) { |
| 612 | return true; |
| 613 | } |
| 614 | |
| 615 | throw $error; |
| 616 | } |
| 617 | } |
| 618 | } |