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| 1 | <?php |
| 2 | /** |
| 3 | * @defgroup FileBackend File backend |
| 4 | * |
| 5 | * File backend is used to interact with file storage systems, |
| 6 | * such as the local file system, NFS, or cloud storage systems. |
| 7 | * See [the architecture doc](@ref filebackendarch) for more information. |
| 8 | */ |
| 9 | |
| 10 | /** |
| 11 | * Base class for all file backends. |
| 12 | * |
| 13 | * This program is free software; you can redistribute it and/or modify |
| 14 | * it under the terms of the GNU General Public License as published by |
| 15 | * the Free Software Foundation; either version 2 of the License, or |
| 16 | * (at your option) any later version. |
| 17 | * |
| 18 | * This program is distributed in the hope that it will be useful, |
| 19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 21 | * GNU General Public License for more details. |
| 22 | * |
| 23 | * You should have received a copy of the GNU General Public License along |
| 24 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 25 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 26 | * http://www.gnu.org/copyleft/gpl.html |
| 27 | * |
| 28 | * @file |
| 29 | * @ingroup FileBackend |
| 30 | */ |
| 31 | use MediaWiki\FileBackend\FSFile\TempFSFileFactory; |
| 32 | use Psr\Log\LoggerAwareInterface; |
| 33 | use Psr\Log\LoggerInterface; |
| 34 | use Psr\Log\NullLogger; |
| 35 | use Wikimedia\ScopedCallback; |
| 36 | |
| 37 | /** |
| 38 | * @brief Base class for all file backend classes (including multi-write backends). |
| 39 | * |
| 40 | * This class defines the methods as abstract that subclasses must implement. |
| 41 | * Outside callers can assume that all backends will have these functions. |
| 42 | * |
| 43 | * All "storage paths" are of the format "mwstore://<backend>/<container>/<path>". |
| 44 | * The "backend" portion is unique name for the application to refer to a backend, while |
| 45 | * the "container" portion is a top-level directory of the backend. The "path" portion |
| 46 | * is a relative path that uses UNIX file system (FS) notation, though any particular |
| 47 | * backend may not actually be using a local filesystem. Therefore, the relative paths |
| 48 | * are only virtual. |
| 49 | * |
| 50 | * Backend contents are stored under "domain"-specific container names by default. |
| 51 | * A domain is simply a logical umbrella for entities, such as those belonging to a certain |
| 52 | * application or portion of a website, for example. A domain can be local or global. |
| 53 | * Global (qualified) backends are achieved by configuring the "domain ID" to a constant. |
| 54 | * Global domains are simpler, but local domains can be used by choosing a domain ID based on |
| 55 | * the current context, such as which language of a website is being used. |
| 56 | * |
| 57 | * For legacy reasons, the FSFileBackend class allows manually setting the paths of |
| 58 | * containers to ones that do not respect the "domain ID". |
| 59 | * |
| 60 | * In key/value (object) stores, containers are the only hierarchy (the rest is emulated). |
| 61 | * FS-based backends are somewhat more restrictive due to the existence of real |
| 62 | * directory files; a regular file cannot have the same name as a directory. Other |
| 63 | * backends with virtual directories may not have this limitation. Callers should |
| 64 | * store files in such a way that no files and directories are under the same path. |
| 65 | * |
| 66 | * In general, this class allows for callers to access storage through the same |
| 67 | * interface, without regard to the underlying storage system. However, calling code |
| 68 | * must follow certain patterns and be aware of certain things to ensure compatibility: |
| 69 | * - a) Always call prepare() on the parent directory before trying to put a file there; |
| 70 | * key/value stores only need the container to exist first, but filesystems need |
| 71 | * all the parent directories to exist first (prepare() is aware of all this) |
| 72 | * - b) Always call clean() on a directory when it might become empty to avoid empty |
| 73 | * directory buildup on filesystems; key/value stores never have empty directories, |
| 74 | * so doing this helps preserve consistency in both cases |
| 75 | * - c) Likewise, do not rely on the existence of empty directories for anything; |
| 76 | * calling directoryExists() on a path that prepare() was previously called on |
| 77 | * will return false for key/value stores if there are no files under that path |
| 78 | * - d) Never alter the resulting FSFile returned from getLocalReference(), as it could |
| 79 | * either be a copy of the source file in /tmp or the original source file itself |
| 80 | * - e) Use a file layout that results in never attempting to store files over directories |
| 81 | * or directories over files; key/value stores allow this but filesystems do not |
| 82 | * - f) Use ASCII file names (e.g. base32, IDs, hashes) to avoid Unicode issues in Windows |
| 83 | * - g) Do not assume that move operations are atomic (difficult with key/value stores) |
| 84 | * - h) Do not assume that file stat or read operations always have immediate consistency; |
| 85 | * various methods have a "latest" flag that should always be used if up-to-date |
| 86 | * information is required (this trades performance for correctness as needed) |
| 87 | * - i) Do not assume that directory listings have immediate consistency |
| 88 | * |
| 89 | * Methods of subclasses should avoid throwing exceptions at all costs. |
| 90 | * As a corollary, external dependencies should be kept to a minimum. |
| 91 | * |
| 92 | * See [the architecture doc](@ref filebackendarch) for more information. |
| 93 | * |
| 94 | * @stable to extend |
| 95 | * |
| 96 | * @ingroup FileBackend |
| 97 | * @since 1.19 |
| 98 | */ |
| 99 | abstract class FileBackend implements LoggerAwareInterface { |
| 100 | /** @var string Unique backend name */ |
| 101 | protected $name; |
| 102 | |
| 103 | /** @var string Unique domain name */ |
| 104 | protected $domainId; |
| 105 | |
| 106 | /** @var string Read-only explanation message */ |
| 107 | protected $readOnly; |
| 108 | |
| 109 | /** @var string When to do operations in parallel */ |
| 110 | protected $parallelize; |
| 111 | |
| 112 | /** @var int How many operations can be done in parallel */ |
| 113 | protected $concurrency; |
| 114 | |
| 115 | /** @var TempFSFileFactory */ |
| 116 | protected $tmpFileFactory; |
| 117 | |
| 118 | /** @var LockManager */ |
| 119 | protected $lockManager; |
| 120 | /** @var LoggerInterface */ |
| 121 | protected $logger; |
| 122 | /** @var callable|null */ |
| 123 | protected $profiler; |
| 124 | |
| 125 | /** @var callable */ |
| 126 | protected $obResetFunc; |
| 127 | /** @var callable|null */ |
| 128 | protected $streamMimeFunc; |
| 129 | /** @var callable|null */ |
| 130 | protected $statusWrapper; |
| 131 | |
| 132 | /** Bitfield flags for supported features */ |
| 133 | public const ATTR_HEADERS = 1; // files can be tagged with standard HTTP headers |
| 134 | public const ATTR_METADATA = 2; // files can be stored with metadata key/values |
| 135 | public const ATTR_UNICODE_PATHS = 4; // files can have Unicode paths (not just ASCII) |
| 136 | |
| 137 | /** @var false Idiom for "no info; non-existant file" (since 1.34) */ |
| 138 | protected const STAT_ABSENT = false; |
| 139 | |
| 140 | /** @var null Idiom for "no info; I/O errors" (since 1.34) */ |
| 141 | public const STAT_ERROR = null; |
| 142 | /** @var null Idiom for "no file/directory list; I/O errors" (since 1.34) */ |
| 143 | public const LIST_ERROR = null; |
| 144 | /** @var null Idiom for "no temp URL; not supported or I/O errors" (since 1.34) */ |
| 145 | public const TEMPURL_ERROR = null; |
| 146 | /** @var null Idiom for "existence unknown; I/O errors" (since 1.34) */ |
| 147 | public const EXISTENCE_ERROR = null; |
| 148 | |
| 149 | /** @var false Idiom for "no timestamp; missing file or I/O errors" (since 1.34) */ |
| 150 | public const TIMESTAMP_FAIL = false; |
| 151 | /** @var false Idiom for "no content; missing file or I/O errors" (since 1.34) */ |
| 152 | public const CONTENT_FAIL = false; |
| 153 | /** @var false Idiom for "no metadata; missing file or I/O errors" (since 1.34) */ |
| 154 | public const XATTRS_FAIL = false; |
| 155 | /** @var false Idiom for "no size; missing file or I/O errors" (since 1.34) */ |
| 156 | public const SIZE_FAIL = false; |
| 157 | /** @var false Idiom for "no SHA1 hash; missing file or I/O errors" (since 1.34) */ |
| 158 | public const SHA1_FAIL = false; |
| 159 | |
| 160 | /** |
| 161 | * Create a new backend instance from configuration. |
| 162 | * This should only be called from within FileBackendGroup. |
| 163 | * @stable to call |
| 164 | * |
| 165 | * @param array $config Parameters include: |
| 166 | * - name : The unique name of this backend. |
| 167 | * This should consist of alphanumberic, '-', and '_' characters. |
| 168 | * This name should not be changed after use. |
| 169 | * Note that the name is *not* used in actual container names. |
| 170 | * - domainId : Prefix to container names that is unique to this backend. |
| 171 | * It should only consist of alphanumberic, '-', and '_' characters. |
| 172 | * This ID is what avoids collisions if multiple logical backends |
| 173 | * use the same storage system, so this should be set carefully. |
| 174 | * - lockManager : LockManager object to use for any file locking. |
| 175 | * If not provided, then no file locking will be enforced. |
| 176 | * - readOnly : Write operations are disallowed if this is a non-empty string. |
| 177 | * It should be an explanation for the backend being read-only. |
| 178 | * - parallelize : When to do file operations in parallel (when possible). |
| 179 | * Allowed values are "implicit", "explicit" and "off". |
| 180 | * - concurrency : How many file operations can be done in parallel. |
| 181 | * - tmpDirectory : Directory to use for temporary files. |
| 182 | * - tmpFileFactory : Optional TempFSFileFactory object. Only has an effect if |
| 183 | * tmpDirectory is not set. If both are unset or null, then the backend will |
| 184 | * try to discover a usable temporary directory. |
| 185 | * - obResetFunc : alternative callback to clear the output buffer |
| 186 | * - streamMimeFunc : alternative method to determine the content type from the path |
| 187 | * - logger : Optional PSR logger object. |
| 188 | * - profiler : Optional callback that takes a section name argument and returns |
| 189 | * a ScopedCallback instance that ends the profile section in its destructor. |
| 190 | * - statusWrapper : Optional callback that is used to wrap returned StatusValues |
| 191 | * @throws InvalidArgumentException |
| 192 | */ |
| 193 | public function __construct( array $config ) { |
| 194 | if ( !array_key_exists( 'name', $config ) ) { |
| 195 | throw new InvalidArgumentException( 'Backend name not specified.' ); |
| 196 | } |
| 197 | $this->name = $config['name']; |
| 198 | $this->domainId = $config['domainId'] // e.g. "my_wiki-en_" |
| 199 | ?? $config['wikiId'] // b/c alias |
| 200 | ?? null; |
| 201 | if ( !is_string( $this->name ) || !preg_match( '!^[a-zA-Z0-9-_]{1,255}$!', $this->name ) ) { |
| 202 | throw new InvalidArgumentException( "Backend name '{$this->name}' is invalid." ); |
| 203 | } |
| 204 | if ( !is_string( $this->domainId ) ) { |
| 205 | throw new InvalidArgumentException( |
| 206 | "Backend domain ID not provided for '{$this->name}'." ); |
| 207 | } |
| 208 | $this->lockManager = $config['lockManager'] ?? new NullLockManager( [] ); |
| 209 | $this->readOnly = isset( $config['readOnly'] ) |
| 210 | ? (string)$config['readOnly'] |
| 211 | : ''; |
| 212 | $this->parallelize = isset( $config['parallelize'] ) |
| 213 | ? (string)$config['parallelize'] |
| 214 | : 'off'; |
| 215 | $this->concurrency = isset( $config['concurrency'] ) |
| 216 | ? (int)$config['concurrency'] |
| 217 | : 50; |
| 218 | $this->obResetFunc = $config['obResetFunc'] ?? [ $this, 'resetOutputBuffer' ]; |
| 219 | $this->streamMimeFunc = $config['streamMimeFunc'] ?? null; |
| 220 | |
| 221 | $this->profiler = $config['profiler'] ?? null; |
| 222 | if ( !is_callable( $this->profiler ) ) { |
| 223 | $this->profiler = null; |
| 224 | } |
| 225 | $this->logger = $config['logger'] ?? new NullLogger(); |
| 226 | $this->statusWrapper = $config['statusWrapper'] ?? null; |
| 227 | // tmpDirectory gets precedence for backward compatibility |
| 228 | if ( isset( $config['tmpDirectory'] ) ) { |
| 229 | $this->tmpFileFactory = new TempFSFileFactory( $config['tmpDirectory'] ); |
| 230 | } else { |
| 231 | $this->tmpFileFactory = $config['tmpFileFactory'] ?? new TempFSFileFactory(); |
| 232 | } |
| 233 | } |
| 234 | |
| 235 | public function setLogger( LoggerInterface $logger ) { |
| 236 | $this->logger = $logger; |
| 237 | } |
| 238 | |
| 239 | /** |
| 240 | * Get the unique backend name |
| 241 | * |
| 242 | * We may have multiple different backends of the same type. |
| 243 | * For example, we can have two Swift backends using different proxies. |
| 244 | * |
| 245 | * @return string |
| 246 | */ |
| 247 | final public function getName() { |
| 248 | return $this->name; |
| 249 | } |
| 250 | |
| 251 | /** |
| 252 | * Get the domain identifier used for this backend (possibly empty). |
| 253 | * |
| 254 | * @return string |
| 255 | * @since 1.28 |
| 256 | */ |
| 257 | final public function getDomainId() { |
| 258 | return $this->domainId; |
| 259 | } |
| 260 | |
| 261 | /** |
| 262 | * Alias to getDomainId() |
| 263 | * |
| 264 | * @return string |
| 265 | * @since 1.20 |
| 266 | * @deprecated Since 1.34 Use getDomainId() |
| 267 | */ |
| 268 | final public function getWikiId() { |
| 269 | return $this->getDomainId(); |
| 270 | } |
| 271 | |
| 272 | /** |
| 273 | * Check if this backend is read-only |
| 274 | * |
| 275 | * @return bool |
| 276 | */ |
| 277 | final public function isReadOnly() { |
| 278 | return ( $this->readOnly != '' ); |
| 279 | } |
| 280 | |
| 281 | /** |
| 282 | * Get an explanatory message if this backend is read-only |
| 283 | * |
| 284 | * @return string|bool Returns false if the backend is not read-only |
| 285 | */ |
| 286 | final public function getReadOnlyReason() { |
| 287 | return ( $this->readOnly != '' ) ? $this->readOnly : false; |
| 288 | } |
| 289 | |
| 290 | /** |
| 291 | * Get the a bitfield of extra features supported by the backend medium |
| 292 | * @stable to override |
| 293 | * |
| 294 | * @return int Bitfield of FileBackend::ATTR_* flags |
| 295 | * @since 1.23 |
| 296 | */ |
| 297 | public function getFeatures() { |
| 298 | return self::ATTR_UNICODE_PATHS; |
| 299 | } |
| 300 | |
| 301 | /** |
| 302 | * Check if the backend medium supports a field of extra features |
| 303 | * |
| 304 | * @param int $bitfield Bitfield of FileBackend::ATTR_* flags |
| 305 | * @return bool |
| 306 | * @since 1.23 |
| 307 | */ |
| 308 | final public function hasFeatures( $bitfield ) { |
| 309 | return ( $this->getFeatures() & $bitfield ) === $bitfield; |
| 310 | } |
| 311 | |
| 312 | /** |
| 313 | * This is the main entry point into the backend for write operations. |
| 314 | * Callers supply an ordered list of operations to perform as a transaction. |
| 315 | * Files will be locked, the stat cache cleared, and then the operations attempted. |
| 316 | * If any serious errors occur, all attempted operations will be rolled back. |
| 317 | * |
| 318 | * $ops is an array of arrays. The outer array holds a list of operations. |
| 319 | * Each inner array is a set of key value pairs that specify an operation. |
| 320 | * |
| 321 | * Supported operations and their parameters. The supported actions are: |
| 322 | * - create |
| 323 | * - store |
| 324 | * - copy |
| 325 | * - move |
| 326 | * - delete |
| 327 | * - describe (since 1.21) |
| 328 | * - null |
| 329 | * |
| 330 | * FSFile/TempFSFile object support was added in 1.27. |
| 331 | * |
| 332 | * a) Create a new file in storage with the contents of a string |
| 333 | * @code |
| 334 | * [ |
| 335 | * 'op' => 'create', |
| 336 | * 'dst' => <storage path>, |
| 337 | * 'content' => <string of new file contents>, |
| 338 | * 'overwrite' => <boolean>, |
| 339 | * 'overwriteSame' => <boolean>, |
| 340 | * 'headers' => <HTTP header name/value map> # since 1.21 |
| 341 | * ] |
| 342 | * @endcode |
| 343 | * |
| 344 | * b) Copy a file system file into storage |
| 345 | * @code |
| 346 | * [ |
| 347 | * 'op' => 'store', |
| 348 | * 'src' => <file system path, FSFile, or TempFSFile>, |
| 349 | * 'dst' => <storage path>, |
| 350 | * 'overwrite' => <boolean>, |
| 351 | * 'overwriteSame' => <boolean>, |
| 352 | * 'headers' => <HTTP header name/value map> # since 1.21 |
| 353 | * ] |
| 354 | * @endcode |
| 355 | * |
| 356 | * c) Copy a file within storage |
| 357 | * @code |
| 358 | * [ |
| 359 | * 'op' => 'copy', |
| 360 | * 'src' => <storage path>, |
| 361 | * 'dst' => <storage path>, |
| 362 | * 'overwrite' => <boolean>, |
| 363 | * 'overwriteSame' => <boolean>, |
| 364 | * 'ignoreMissingSource' => <boolean>, # since 1.21 |
| 365 | * 'headers' => <HTTP header name/value map> # since 1.21 |
| 366 | * ] |
| 367 | * @endcode |
| 368 | * |
| 369 | * d) Move a file within storage |
| 370 | * @code |
| 371 | * [ |
| 372 | * 'op' => 'move', |
| 373 | * 'src' => <storage path>, |
| 374 | * 'dst' => <storage path>, |
| 375 | * 'overwrite' => <boolean>, |
| 376 | * 'overwriteSame' => <boolean>, |
| 377 | * 'ignoreMissingSource' => <boolean>, # since 1.21 |
| 378 | * 'headers' => <HTTP header name/value map> # since 1.21 |
| 379 | * ] |
| 380 | * @endcode |
| 381 | * |
| 382 | * e) Delete a file within storage |
| 383 | * @code |
| 384 | * [ |
| 385 | * 'op' => 'delete', |
| 386 | * 'src' => <storage path>, |
| 387 | * 'ignoreMissingSource' => <boolean> |
| 388 | * ] |
| 389 | * @endcode |
| 390 | * |
| 391 | * f) Update metadata for a file within storage |
| 392 | * @code |
| 393 | * [ |
| 394 | * 'op' => 'describe', |
| 395 | * 'src' => <storage path>, |
| 396 | * 'headers' => <HTTP header name/value map> |
| 397 | * ] |
| 398 | * @endcode |
| 399 | * |
| 400 | * g) Do nothing (no-op) |
| 401 | * @code |
| 402 | * [ |
| 403 | * 'op' => 'null', |
| 404 | * ] |
| 405 | * @endcode |
| 406 | * |
| 407 | * Boolean flags for operations (operation-specific): |
| 408 | * - ignoreMissingSource : The operation will simply succeed and do |
| 409 | * nothing if the source file does not exist. |
| 410 | * - overwrite : Any destination file will be overwritten. |
| 411 | * - overwriteSame : If a file already exists at the destination with the |
| 412 | * same contents, then do nothing to the destination file |
| 413 | * instead of giving an error. This does not compare headers. |
| 414 | * This option is ignored if 'overwrite' is already provided. |
| 415 | * - headers : If supplied, the result of merging these headers with any |
| 416 | * existing source file headers (replacing conflicting ones) |
| 417 | * will be set as the destination file headers. Headers are |
| 418 | * deleted if their value is set to the empty string. When a |
| 419 | * file has headers they are included in responses to GET and |
| 420 | * HEAD requests to the backing store for that file. |
| 421 | * Header values should be no larger than 255 bytes, except for |
| 422 | * Content-Disposition. The system might ignore or truncate any |
| 423 | * headers that are too long to store (exact limits will vary). |
| 424 | * Backends that don't support metadata ignore this. (since 1.21) |
| 425 | * |
| 426 | * $opts is an associative of boolean flags, including: |
| 427 | * - force : Operation precondition errors no longer trigger an abort. |
| 428 | * Any remaining operations are still attempted. Unexpected |
| 429 | * failures may still cause remaining operations to be aborted. |
| 430 | * - nonLocking : No locks are acquired for the operations. |
| 431 | * This can increase performance for non-critical writes. |
| 432 | * This has no effect unless the 'force' flag is set. |
| 433 | * - parallelize : Try to do operations in parallel when possible. |
| 434 | * - bypassReadOnly : Allow writes in read-only mode. (since 1.20) |
| 435 | * - preserveCache : Don't clear the process cache before checking files. |
| 436 | * This should only be used if all entries in the process |
| 437 | * cache were added after the files were already locked. (since 1.20) |
| 438 | * |
| 439 | * @note Remarks on locking: |
| 440 | * File system paths given to operations should refer to files that are |
| 441 | * already locked or otherwise safe from modification from other processes. |
| 442 | * Normally these files will be new temp files, which should be adequate. |
| 443 | * |
| 444 | * @par Return value: |
| 445 | * |
| 446 | * This returns a Status, which contains all warnings and fatals that occurred |
| 447 | * during the operation. The 'failCount', 'successCount', and 'success' members |
| 448 | * will reflect each operation attempted. |
| 449 | * |
| 450 | * The StatusValue will be "OK" unless: |
| 451 | * - a) unexpected operation errors occurred (network partitions, disk full...) |
| 452 | * - b) predicted operation errors occurred and 'force' was not set |
| 453 | * |
| 454 | * @param array[] $ops List of operations to execute in order |
| 455 | * @phan-param array<int,array{ignoreMissingSource?:bool,overwrite?:bool,overwriteSame?:bool,headers?:bool}> $ops |
| 456 | * @param array $opts Batch operation options |
| 457 | * @phpcs:ignore Generic.Files.LineLength |
| 458 | * @phan-param array{force?:bool,nonLocking?:bool,parallelize?:bool,bypassReadOnly?:bool,preserveCache?:bool} $opts |
| 459 | * @return StatusValue |
| 460 | */ |
| 461 | final public function doOperations( array $ops, array $opts = [] ) { |
| 462 | if ( empty( $opts['bypassReadOnly'] ) && $this->isReadOnly() ) { |
| 463 | return $this->newStatus( 'backend-fail-readonly', $this->name, $this->readOnly ); |
| 464 | } |
| 465 | if ( $ops === [] ) { |
| 466 | return $this->newStatus(); // nothing to do |
| 467 | } |
| 468 | |
| 469 | $ops = $this->resolveFSFileObjects( $ops ); |
| 470 | if ( empty( $opts['force'] ) ) { |
| 471 | unset( $opts['nonLocking'] ); |
| 472 | } |
| 473 | |
| 474 | /** @noinspection PhpUnusedLocalVariableInspection */ |
| 475 | $scope = ScopedCallback::newScopedIgnoreUserAbort(); // try to ignore client aborts |
| 476 | |
| 477 | return $this->doOperationsInternal( $ops, $opts ); |
| 478 | } |
| 479 | |
| 480 | /** |
| 481 | * @see FileBackend::doOperations() |
| 482 | * @param array $ops |
| 483 | * @param array $opts |
| 484 | * @return StatusValue |
| 485 | */ |
| 486 | abstract protected function doOperationsInternal( array $ops, array $opts ); |
| 487 | |
| 488 | /** |
| 489 | * Same as doOperations() except it takes a single operation. |
| 490 | * If you are doing a batch of operations that should either |
| 491 | * all succeed or all fail, then use that function instead. |
| 492 | * |
| 493 | * @see FileBackend::doOperations() |
| 494 | * |
| 495 | * @param array $op Operation |
| 496 | * @param array $opts Operation options |
| 497 | * @return StatusValue |
| 498 | */ |
| 499 | final public function doOperation( array $op, array $opts = [] ) { |
| 500 | return $this->doOperations( [ $op ], $opts ); |
| 501 | } |
| 502 | |
| 503 | /** |
| 504 | * Performs a single create operation. |
| 505 | * This sets $params['op'] to 'create' and passes it to doOperation(). |
| 506 | * |
| 507 | * @see FileBackend::doOperation() |
| 508 | * |
| 509 | * @param array $params Operation parameters |
| 510 | * @param array $opts Operation options |
| 511 | * @return StatusValue |
| 512 | */ |
| 513 | final public function create( array $params, array $opts = [] ) { |
| 514 | return $this->doOperation( [ 'op' => 'create' ] + $params, $opts ); |
| 515 | } |
| 516 | |
| 517 | /** |
| 518 | * Performs a single store operation. |
| 519 | * This sets $params['op'] to 'store' and passes it to doOperation(). |
| 520 | * |
| 521 | * @see FileBackend::doOperation() |
| 522 | * |
| 523 | * @param array $params Operation parameters |
| 524 | * @param array $opts Operation options |
| 525 | * @return StatusValue |
| 526 | */ |
| 527 | final public function store( array $params, array $opts = [] ) { |
| 528 | return $this->doOperation( [ 'op' => 'store' ] + $params, $opts ); |
| 529 | } |
| 530 | |
| 531 | /** |
| 532 | * Performs a single copy operation. |
| 533 | * This sets $params['op'] to 'copy' and passes it to doOperation(). |
| 534 | * |
| 535 | * @see FileBackend::doOperation() |
| 536 | * |
| 537 | * @param array $params Operation parameters |
| 538 | * @param array $opts Operation options |
| 539 | * @return StatusValue |
| 540 | */ |
| 541 | final public function copy( array $params, array $opts = [] ) { |
| 542 | return $this->doOperation( [ 'op' => 'copy' ] + $params, $opts ); |
| 543 | } |
| 544 | |
| 545 | /** |
| 546 | * Performs a single move operation. |
| 547 | * This sets $params['op'] to 'move' and passes it to doOperation(). |
| 548 | * |
| 549 | * @see FileBackend::doOperation() |
| 550 | * |
| 551 | * @param array $params Operation parameters |
| 552 | * @param array $opts Operation options |
| 553 | * @return StatusValue |
| 554 | */ |
| 555 | final public function move( array $params, array $opts = [] ) { |
| 556 | return $this->doOperation( [ 'op' => 'move' ] + $params, $opts ); |
| 557 | } |
| 558 | |
| 559 | /** |
| 560 | * Performs a single delete operation. |
| 561 | * This sets $params['op'] to 'delete' and passes it to doOperation(). |
| 562 | * |
| 563 | * @see FileBackend::doOperation() |
| 564 | * |
| 565 | * @param array $params Operation parameters |
| 566 | * @param array $opts Operation options |
| 567 | * @return StatusValue |
| 568 | */ |
| 569 | final public function delete( array $params, array $opts = [] ) { |
| 570 | return $this->doOperation( [ 'op' => 'delete' ] + $params, $opts ); |
| 571 | } |
| 572 | |
| 573 | /** |
| 574 | * Performs a single describe operation. |
| 575 | * This sets $params['op'] to 'describe' and passes it to doOperation(). |
| 576 | * |
| 577 | * @see FileBackend::doOperation() |
| 578 | * |
| 579 | * @param array $params Operation parameters |
| 580 | * @param array $opts Operation options |
| 581 | * @return StatusValue |
| 582 | * @since 1.21 |
| 583 | */ |
| 584 | final public function describe( array $params, array $opts = [] ) { |
| 585 | return $this->doOperation( [ 'op' => 'describe' ] + $params, $opts ); |
| 586 | } |
| 587 | |
| 588 | /** |
| 589 | * Perform a set of independent file operations on some files. |
| 590 | * |
| 591 | * This does no locking, and possibly no stat calls. |
| 592 | * Any destination files that already exist will be overwritten. |
| 593 | * This should *only* be used on non-original files, like cache files. |
| 594 | * |
| 595 | * Supported operations and their parameters: |
| 596 | * - create |
| 597 | * - store |
| 598 | * - copy |
| 599 | * - move |
| 600 | * - delete |
| 601 | * - describe (since 1.21) |
| 602 | * - null |
| 603 | * |
| 604 | * FSFile/TempFSFile object support was added in 1.27. |
| 605 | * |
| 606 | * a) Create a new file in storage with the contents of a string |
| 607 | * @code |
| 608 | * [ |
| 609 | * 'op' => 'create', |
| 610 | * 'dst' => <storage path>, |
| 611 | * 'content' => <string of new file contents>, |
| 612 | * 'headers' => <HTTP header name/value map> # since 1.21 |
| 613 | * ] |
| 614 | * @endcode |
| 615 | * |
| 616 | * b) Copy a file system file into storage |
| 617 | * @code |
| 618 | * [ |
| 619 | * 'op' => 'store', |
| 620 | * 'src' => <file system path, FSFile, or TempFSFile>, |
| 621 | * 'dst' => <storage path>, |
| 622 | * 'headers' => <HTTP header name/value map> # since 1.21 |
| 623 | * ] |
| 624 | * @endcode |
| 625 | * |
| 626 | * c) Copy a file within storage |
| 627 | * @code |
| 628 | * [ |
| 629 | * 'op' => 'copy', |
| 630 | * 'src' => <storage path>, |
| 631 | * 'dst' => <storage path>, |
| 632 | * 'ignoreMissingSource' => <boolean>, # since 1.21 |
| 633 | * 'headers' => <HTTP header name/value map> # since 1.21 |
| 634 | * ] |
| 635 | * @endcode |
| 636 | * |
| 637 | * d) Move a file within storage |
| 638 | * @code |
| 639 | * [ |
| 640 | * 'op' => 'move', |
| 641 | * 'src' => <storage path>, |
| 642 | * 'dst' => <storage path>, |
| 643 | * 'ignoreMissingSource' => <boolean>, # since 1.21 |
| 644 | * 'headers' => <HTTP header name/value map> # since 1.21 |
| 645 | * ] |
| 646 | * @endcode |
| 647 | * |
| 648 | * e) Delete a file within storage |
| 649 | * @code |
| 650 | * [ |
| 651 | * 'op' => 'delete', |
| 652 | * 'src' => <storage path>, |
| 653 | * 'ignoreMissingSource' => <boolean> |
| 654 | * ] |
| 655 | * @endcode |
| 656 | * |
| 657 | * f) Update metadata for a file within storage |
| 658 | * @code |
| 659 | * [ |
| 660 | * 'op' => 'describe', |
| 661 | * 'src' => <storage path>, |
| 662 | * 'headers' => <HTTP header name/value map> |
| 663 | * ] |
| 664 | * @endcode |
| 665 | * |
| 666 | * g) Do nothing (no-op) |
| 667 | * @code |
| 668 | * [ |
| 669 | * 'op' => 'null', |
| 670 | * ] |
| 671 | * @endcode |
| 672 | * |
| 673 | * @par Boolean flags for operations (operation-specific): |
| 674 | * - ignoreMissingSource : The operation will simply succeed and do |
| 675 | * nothing if the source file does not exist. |
| 676 | * - headers : If supplied with a header name/value map, the backend will |
| 677 | * reply with these headers when GETs/HEADs of the destination |
| 678 | * file are made. Header values should be smaller than 256 bytes. |
| 679 | * Content-Disposition headers can be longer, though the system |
| 680 | * might ignore or truncate ones that are too long to store. |
| 681 | * Existing headers will remain, but these will replace any |
| 682 | * conflicting previous headers, and headers will be removed |
| 683 | * if they are set to an empty string. |
| 684 | * Backends that don't support metadata ignore this. (since 1.21) |
| 685 | * |
| 686 | * $opts is an associative of boolean flags, including: |
| 687 | * - bypassReadOnly : Allow writes in read-only mode (since 1.20) |
| 688 | * |
| 689 | * @par Return value: |
| 690 | * This returns a Status, which contains all warnings and fatals that occurred |
| 691 | * during the operation. The 'failCount', 'successCount', and 'success' members |
| 692 | * will reflect each operation attempted for the given files. The StatusValue will be |
| 693 | * considered "OK" as long as no fatal errors occurred. |
| 694 | * |
| 695 | * @param array $ops Set of operations to execute |
| 696 | * @phan-param list<array{op:?string,src?:string,dst?:string,ignoreMissingSource?:bool,headers?:array}> $ops |
| 697 | * @param array $opts Batch operation options |
| 698 | * @phan-param array{bypassReadOnly?:bool} $opts |
| 699 | * @return StatusValue |
| 700 | * @since 1.20 |
| 701 | */ |
| 702 | final public function doQuickOperations( array $ops, array $opts = [] ) { |
| 703 | if ( empty( $opts['bypassReadOnly'] ) && $this->isReadOnly() ) { |
| 704 | return $this->newStatus( 'backend-fail-readonly', $this->name, $this->readOnly ); |
| 705 | } |
| 706 | if ( $ops === [] ) { |
| 707 | return $this->newStatus(); // nothing to do |
| 708 | } |
| 709 | |
| 710 | $ops = $this->resolveFSFileObjects( $ops ); |
| 711 | foreach ( $ops as &$op ) { |
| 712 | $op['overwrite'] = true; // avoids RTTs in key/value stores |
| 713 | } |
| 714 | |
| 715 | /** @noinspection PhpUnusedLocalVariableInspection */ |
| 716 | $scope = ScopedCallback::newScopedIgnoreUserAbort(); // try to ignore client aborts |
| 717 | |
| 718 | return $this->doQuickOperationsInternal( $ops, $opts ); |
| 719 | } |
| 720 | |
| 721 | /** |
| 722 | * @see FileBackend::doQuickOperations() |
| 723 | * @param array $ops |
| 724 | * @param array $opts |
| 725 | * @return StatusValue |
| 726 | * @since 1.20 |
| 727 | */ |
| 728 | abstract protected function doQuickOperationsInternal( array $ops, array $opts ); |
| 729 | |
| 730 | /** |
| 731 | * Same as doQuickOperations() except it takes a single operation. |
| 732 | * If you are doing a batch of operations, then use that function instead. |
| 733 | * |
| 734 | * @see FileBackend::doQuickOperations() |
| 735 | * |
| 736 | * @param array $op Operation |
| 737 | * @param array $opts Batch operation options |
| 738 | * @return StatusValue |
| 739 | * @since 1.20 |
| 740 | */ |
| 741 | final public function doQuickOperation( array $op, array $opts = [] ) { |
| 742 | return $this->doQuickOperations( [ $op ], $opts ); |
| 743 | } |
| 744 | |
| 745 | /** |
| 746 | * Performs a single quick create operation. |
| 747 | * This sets $params['op'] to 'create' and passes it to doQuickOperation(). |
| 748 | * |
| 749 | * @see FileBackend::doQuickOperation() |
| 750 | * |
| 751 | * @param array $params Operation parameters |
| 752 | * @param array $opts Operation options |
| 753 | * @return StatusValue |
| 754 | * @since 1.20 |
| 755 | */ |
| 756 | final public function quickCreate( array $params, array $opts = [] ) { |
| 757 | return $this->doQuickOperation( [ 'op' => 'create' ] + $params, $opts ); |
| 758 | } |
| 759 | |
| 760 | /** |
| 761 | * Performs a single quick store operation. |
| 762 | * This sets $params['op'] to 'store' and passes it to doQuickOperation(). |
| 763 | * |
| 764 | * @see FileBackend::doQuickOperation() |
| 765 | * |
| 766 | * @param array $params Operation parameters |
| 767 | * @param array $opts Operation options |
| 768 | * @return StatusValue |
| 769 | * @since 1.20 |
| 770 | */ |
| 771 | final public function quickStore( array $params, array $opts = [] ) { |
| 772 | return $this->doQuickOperation( [ 'op' => 'store' ] + $params, $opts ); |
| 773 | } |
| 774 | |
| 775 | /** |
| 776 | * Performs a single quick copy operation. |
| 777 | * This sets $params['op'] to 'copy' and passes it to doQuickOperation(). |
| 778 | * |
| 779 | * @see FileBackend::doQuickOperation() |
| 780 | * |
| 781 | * @param array $params Operation parameters |
| 782 | * @param array $opts Operation options |
| 783 | * @return StatusValue |
| 784 | * @since 1.20 |
| 785 | */ |
| 786 | final public function quickCopy( array $params, array $opts = [] ) { |
| 787 | return $this->doQuickOperation( [ 'op' => 'copy' ] + $params, $opts ); |
| 788 | } |
| 789 | |
| 790 | /** |
| 791 | * Performs a single quick move operation. |
| 792 | * This sets $params['op'] to 'move' and passes it to doQuickOperation(). |
| 793 | * |
| 794 | * @see FileBackend::doQuickOperation() |
| 795 | * |
| 796 | * @param array $params Operation parameters |
| 797 | * @param array $opts Operation options |
| 798 | * @return StatusValue |
| 799 | * @since 1.20 |
| 800 | */ |
| 801 | final public function quickMove( array $params, array $opts = [] ) { |
| 802 | return $this->doQuickOperation( [ 'op' => 'move' ] + $params, $opts ); |
| 803 | } |
| 804 | |
| 805 | /** |
| 806 | * Performs a single quick delete operation. |
| 807 | * This sets $params['op'] to 'delete' and passes it to doQuickOperation(). |
| 808 | * |
| 809 | * @see FileBackend::doQuickOperation() |
| 810 | * |
| 811 | * @param array $params Operation parameters |
| 812 | * @param array $opts Operation options |
| 813 | * @return StatusValue |
| 814 | * @since 1.20 |
| 815 | */ |
| 816 | final public function quickDelete( array $params, array $opts = [] ) { |
| 817 | return $this->doQuickOperation( [ 'op' => 'delete' ] + $params, $opts ); |
| 818 | } |
| 819 | |
| 820 | /** |
| 821 | * Performs a single quick describe operation. |
| 822 | * This sets $params['op'] to 'describe' and passes it to doQuickOperation(). |
| 823 | * |
| 824 | * @see FileBackend::doQuickOperation() |
| 825 | * |
| 826 | * @param array $params Operation parameters |
| 827 | * @param array $opts Operation options |
| 828 | * @return StatusValue |
| 829 | * @since 1.21 |
| 830 | */ |
| 831 | final public function quickDescribe( array $params, array $opts = [] ) { |
| 832 | return $this->doQuickOperation( [ 'op' => 'describe' ] + $params, $opts ); |
| 833 | } |
| 834 | |
| 835 | /** |
| 836 | * Concatenate a list of storage files into a single file system file. |
| 837 | * The target path should refer to a file that is already locked or |
| 838 | * otherwise safe from modification from other processes. Normally, |
| 839 | * the file will be a new temp file, which should be adequate. |
| 840 | * |
| 841 | * @param array $params Operation parameters, include: |
| 842 | * - srcs : ordered source storage paths (e.g. chunk1, chunk2, ...) |
| 843 | * - dst : file system path to 0-byte temp file |
| 844 | * - parallelize : try to do operations in parallel when possible |
| 845 | * @return StatusValue |
| 846 | */ |
| 847 | abstract public function concatenate( array $params ); |
| 848 | |
| 849 | /** |
| 850 | * Prepare a storage directory for usage. |
| 851 | * This will create any required containers and parent directories. |
| 852 | * Backends using key/value stores only need to create the container. |
| 853 | * |
| 854 | * The 'noAccess' and 'noListing' parameters works the same as in secure(), |
| 855 | * except they are only applied *if* the directory/container had to be created. |
| 856 | * These flags should always be set for directories that have private files. |
| 857 | * However, setting them is not guaranteed to actually do anything. |
| 858 | * Additional server configuration may be needed to achieve the desired effect. |
| 859 | * |
| 860 | * @param array $params Parameters include: |
| 861 | * - dir : storage directory |
| 862 | * - noAccess : try to deny file access (since 1.20) |
| 863 | * - noListing : try to deny file listing (since 1.20) |
| 864 | * - bypassReadOnly : allow writes in read-only mode (since 1.20) |
| 865 | * @return StatusValue Good status without value for success, fatal otherwise. |
| 866 | */ |
| 867 | final public function prepare( array $params ) { |
| 868 | if ( empty( $params['bypassReadOnly'] ) && $this->isReadOnly() ) { |
| 869 | return $this->newStatus( 'backend-fail-readonly', $this->name, $this->readOnly ); |
| 870 | } |
| 871 | /** @noinspection PhpUnusedLocalVariableInspection */ |
| 872 | $scope = ScopedCallback::newScopedIgnoreUserAbort(); // try to ignore client aborts |
| 873 | return $this->doPrepare( $params ); |
| 874 | } |
| 875 | |
| 876 | /** |
| 877 | * @see FileBackend::prepare() |
| 878 | * @param array $params |
| 879 | * @return StatusValue Good status without value for success, fatal otherwise. |
| 880 | */ |
| 881 | abstract protected function doPrepare( array $params ); |
| 882 | |
| 883 | /** |
| 884 | * Take measures to block web access to a storage directory and |
| 885 | * the container it belongs to. FS backends might add .htaccess |
| 886 | * files whereas key/value store backends might revoke container |
| 887 | * access to the storage user representing end-users in web requests. |
| 888 | * |
| 889 | * This is not guaranteed to actually make files or listings publicly hidden. |
| 890 | * Additional server configuration may be needed to achieve the desired effect. |
| 891 | * |
| 892 | * @param array $params Parameters include: |
| 893 | * - dir : storage directory |
| 894 | * - noAccess : try to deny file access |
| 895 | * - noListing : try to deny file listing |
| 896 | * - bypassReadOnly : allow writes in read-only mode (since 1.20) |
| 897 | * @return StatusValue |
| 898 | */ |
| 899 | final public function secure( array $params ) { |
| 900 | if ( empty( $params['bypassReadOnly'] ) && $this->isReadOnly() ) { |
| 901 | return $this->newStatus( 'backend-fail-readonly', $this->name, $this->readOnly ); |
| 902 | } |
| 903 | /** @noinspection PhpUnusedLocalVariableInspection */ |
| 904 | $scope = ScopedCallback::newScopedIgnoreUserAbort(); // try to ignore client aborts |
| 905 | return $this->doSecure( $params ); |
| 906 | } |
| 907 | |
| 908 | /** |
| 909 | * @see FileBackend::secure() |
| 910 | * @param array $params |
| 911 | * @return StatusValue |
| 912 | */ |
| 913 | abstract protected function doSecure( array $params ); |
| 914 | |
| 915 | /** |
| 916 | * Remove measures to block web access to a storage directory and |
| 917 | * the container it belongs to. FS backends might remove .htaccess |
| 918 | * files whereas key/value store backends might grant container |
| 919 | * access to the storage user representing end-users in web requests. |
| 920 | * This essentially can undo the result of secure() calls. |
| 921 | * |
| 922 | * This is not guaranteed to actually make files or listings publicly viewable. |
| 923 | * Additional server configuration may be needed to achieve the desired effect. |
| 924 | * |
| 925 | * @param array $params Parameters include: |
| 926 | * - dir : storage directory |
| 927 | * - access : try to allow file access |
| 928 | * - listing : try to allow file listing |
| 929 | * - bypassReadOnly : allow writes in read-only mode (since 1.20) |
| 930 | * @return StatusValue |
| 931 | * @since 1.20 |
| 932 | */ |
| 933 | final public function publish( array $params ) { |
| 934 | if ( empty( $params['bypassReadOnly'] ) && $this->isReadOnly() ) { |
| 935 | return $this->newStatus( 'backend-fail-readonly', $this->name, $this->readOnly ); |
| 936 | } |
| 937 | /** @noinspection PhpUnusedLocalVariableInspection */ |
| 938 | $scope = ScopedCallback::newScopedIgnoreUserAbort(); // try to ignore client aborts |
| 939 | return $this->doPublish( $params ); |
| 940 | } |
| 941 | |
| 942 | /** |
| 943 | * @see FileBackend::publish() |
| 944 | * @param array $params |
| 945 | * @return StatusValue |
| 946 | */ |
| 947 | abstract protected function doPublish( array $params ); |
| 948 | |
| 949 | /** |
| 950 | * Delete a storage directory if it is empty. |
| 951 | * Backends using key/value stores may do nothing unless the directory |
| 952 | * is that of an empty container, in which case it will be deleted. |
| 953 | * |
| 954 | * @param array $params Parameters include: |
| 955 | * - dir : storage directory |
| 956 | * - recursive : recursively delete empty subdirectories first (since 1.20) |
| 957 | * - bypassReadOnly : allow writes in read-only mode (since 1.20) |
| 958 | * @return StatusValue |
| 959 | */ |
| 960 | final public function clean( array $params ) { |
| 961 | if ( empty( $params['bypassReadOnly'] ) && $this->isReadOnly() ) { |
| 962 | return $this->newStatus( 'backend-fail-readonly', $this->name, $this->readOnly ); |
| 963 | } |
| 964 | /** @noinspection PhpUnusedLocalVariableInspection */ |
| 965 | $scope = ScopedCallback::newScopedIgnoreUserAbort(); // try to ignore client aborts |
| 966 | return $this->doClean( $params ); |
| 967 | } |
| 968 | |
| 969 | /** |
| 970 | * @see FileBackend::clean() |
| 971 | * @param array $params |
| 972 | * @return StatusValue |
| 973 | */ |
| 974 | abstract protected function doClean( array $params ); |
| 975 | |
| 976 | /** |
| 977 | * Check if a file exists at a storage path in the backend. |
| 978 | * This returns false if only a directory exists at the path. |
| 979 | * |
| 980 | * Callers that only care if a file is readily accessible can use non-strict |
| 981 | * comparisons on the result. If "does not exist" and "existence is unknown" |
| 982 | * must be distinguished, then strict comparisons to true/null should be used. |
| 983 | * |
| 984 | * @see FileBackend::EXISTENCE_ERROR |
| 985 | * @see FileBackend::directoryExists() |
| 986 | * |
| 987 | * @param array $params Parameters include: |
| 988 | * - src : source storage path |
| 989 | * - latest : use the latest available data |
| 990 | * @return bool|null Whether the file exists or null (I/O error) |
| 991 | */ |
| 992 | abstract public function fileExists( array $params ); |
| 993 | |
| 994 | /** |
| 995 | * Get the last-modified timestamp of the file at a storage path. |
| 996 | * |
| 997 | * @see FileBackend::TIMESTAMP_FAIL |
| 998 | * |
| 999 | * @param array $params Parameters include: |
| 1000 | * - src : source storage path |
| 1001 | * - latest : use the latest available data |
| 1002 | * @return string|false TS_MW timestamp or false (missing file or I/O error) |
| 1003 | */ |
| 1004 | abstract public function getFileTimestamp( array $params ); |
| 1005 | |
| 1006 | /** |
| 1007 | * Get the contents of a file at a storage path in the backend. |
| 1008 | * This should be avoided for potentially large files. |
| 1009 | * |
| 1010 | * @see FileBackend::CONTENT_FAIL |
| 1011 | * |
| 1012 | * @param array $params Parameters include: |
| 1013 | * - src : source storage path |
| 1014 | * - latest : use the latest available data |
| 1015 | * @return string|false Content string or false (missing file or I/O error) |
| 1016 | */ |
| 1017 | final public function getFileContents( array $params ) { |
| 1018 | $contents = $this->getFileContentsMulti( [ 'srcs' => [ $params['src'] ] ] + $params ); |
| 1019 | |
| 1020 | return $contents[$params['src']]; |
| 1021 | } |
| 1022 | |
| 1023 | /** |
| 1024 | * Like getFileContents() except it takes an array of storage paths |
| 1025 | * and returns an order preserved map of storage paths to their content. |
| 1026 | * |
| 1027 | * @see FileBackend::getFileContents() |
| 1028 | * |
| 1029 | * @param array $params Parameters include: |
| 1030 | * - srcs : list of source storage paths |
| 1031 | * - latest : use the latest available data |
| 1032 | * - parallelize : try to do operations in parallel when possible |
| 1033 | * @return string[]|false[] Map of (path name => file content or false on failure) |
| 1034 | * @since 1.20 |
| 1035 | */ |
| 1036 | abstract public function getFileContentsMulti( array $params ); |
| 1037 | |
| 1038 | /** |
| 1039 | * Get metadata about a file at a storage path in the backend. |
| 1040 | * If the file does not exist, then this returns false. |
| 1041 | * Otherwise, the result is an associative array that includes: |
| 1042 | * - headers : map of HTTP headers used for GET/HEAD requests (name => value) |
| 1043 | * - metadata : map of file metadata (name => value) |
| 1044 | * Metadata keys and headers names will be returned in all lower-case. |
| 1045 | * Additional values may be included for internal use only. |
| 1046 | * |
| 1047 | * Use FileBackend::hasFeatures() to check how well this is supported. |
| 1048 | * |
| 1049 | * @see FileBackend::XATTRS_FAIL |
| 1050 | * |
| 1051 | * @param array $params |
| 1052 | * $params include: |
| 1053 | * - src : source storage path |
| 1054 | * - latest : use the latest available data |
| 1055 | * @return array|false File metadata array or false (missing file or I/O error) |
| 1056 | * @since 1.23 |
| 1057 | */ |
| 1058 | abstract public function getFileXAttributes( array $params ); |
| 1059 | |
| 1060 | /** |
| 1061 | * Get the size (bytes) of a file at a storage path in the backend. |
| 1062 | * |
| 1063 | * @see FileBackend::SIZE_FAIL |
| 1064 | * |
| 1065 | * @param array $params Parameters include: |
| 1066 | * - src : source storage path |
| 1067 | * - latest : use the latest available data |
| 1068 | * @return int|false File size in bytes or false (missing file or I/O error) |
| 1069 | */ |
| 1070 | abstract public function getFileSize( array $params ); |
| 1071 | |
| 1072 | /** |
| 1073 | * Get quick information about a file at a storage path in the backend. |
| 1074 | * If the file does not exist, then this returns false. |
| 1075 | * Otherwise, the result is an associative array that includes: |
| 1076 | * - mtime : the last-modified timestamp (TS_MW) |
| 1077 | * - size : the file size (bytes) |
| 1078 | * Additional values may be included for internal use only. |
| 1079 | * |
| 1080 | * @see FileBackend::STAT_ABSENT |
| 1081 | * @see FileBackend::STAT_ERROR |
| 1082 | * |
| 1083 | * @param array $params Parameters include: |
| 1084 | * - src : source storage path |
| 1085 | * - latest : use the latest available data |
| 1086 | * @return array|false|null Attribute map, false (missing file), or null (I/O error) |
| 1087 | */ |
| 1088 | abstract public function getFileStat( array $params ); |
| 1089 | |
| 1090 | /** |
| 1091 | * Get a SHA-1 hash of the content of the file at a storage path in the backend. |
| 1092 | * |
| 1093 | * @see FileBackend::SHA1_FAIL |
| 1094 | * |
| 1095 | * @param array $params Parameters include: |
| 1096 | * - src : source storage path |
| 1097 | * - latest : use the latest available data |
| 1098 | * @return string|false Hash string or false (missing file or I/O error) |
| 1099 | */ |
| 1100 | abstract public function getFileSha1Base36( array $params ); |
| 1101 | |
| 1102 | /** |
| 1103 | * Get the properties of the content of the file at a storage path in the backend. |
| 1104 | * This gives the result of FSFile::getProps() on a local copy of the file. |
| 1105 | * |
| 1106 | * @param array $params Parameters include: |
| 1107 | * - src : source storage path |
| 1108 | * - latest : use the latest available data |
| 1109 | * @return array Properties map; FSFile::placeholderProps() if file missing or on I/O error |
| 1110 | */ |
| 1111 | abstract public function getFileProps( array $params ); |
| 1112 | |
| 1113 | /** |
| 1114 | * Stream the content of the file at a storage path in the backend. |
| 1115 | * |
| 1116 | * If the file does not exists, an HTTP 404 error will be given. |
| 1117 | * Appropriate HTTP headers (Status, Content-Type, Content-Length) |
| 1118 | * will be sent if streaming began, while none will be sent otherwise. |
| 1119 | * Implementations should flush the output buffer before sending data. |
| 1120 | * |
| 1121 | * @param array $params Parameters include: |
| 1122 | * - src : source storage path |
| 1123 | * - headers : list of additional HTTP headers to send if the file exists |
| 1124 | * - options : HTTP request header map with lower case keys (since 1.28). Supports: |
| 1125 | * range : format is "bytes=(\d*-\d*)" |
| 1126 | * if-modified-since : format is an HTTP date |
| 1127 | * - headless : do not send HTTP headers (including those of "headers") (since 1.28) |
| 1128 | * - latest : use the latest available data |
| 1129 | * - allowOB : preserve any output buffers (since 1.28) |
| 1130 | * @return StatusValue |
| 1131 | */ |
| 1132 | abstract public function streamFile( array $params ); |
| 1133 | |
| 1134 | /** |
| 1135 | * Returns a file system file, identical in content to the file at a storage path. |
| 1136 | * The file returned is either: |
| 1137 | * - a) A TempFSFile local copy of the file at a storage path in the backend. |
| 1138 | * The temporary copy will have the same extension as the source. |
| 1139 | * Temporary files may be purged when the file object falls out of scope. |
| 1140 | * - b) An FSFile pointing to the original file at a storage path in the backend. |
| 1141 | * This is applicable for backends layered directly on top of file systems. |
| 1142 | * |
| 1143 | * Never modify the returned file since it might be the original, it might be shared |
| 1144 | * among multiple callers of this method, or the backend might internally keep FSFile |
| 1145 | * references for deferred operations. |
| 1146 | * |
| 1147 | * @param array $params Parameters include: |
| 1148 | * - src : source storage path |
| 1149 | * - latest : use the latest available data |
| 1150 | * @return FSFile|null|false Local file copy or false (missing) or null (error) |
| 1151 | */ |
| 1152 | final public function getLocalReference( array $params ) { |
| 1153 | $fsFiles = $this->getLocalReferenceMulti( [ 'srcs' => [ $params['src'] ] ] + $params ); |
| 1154 | |
| 1155 | return $fsFiles[$params['src']]; |
| 1156 | } |
| 1157 | |
| 1158 | /** |
| 1159 | * Like getLocalReference() except it takes an array of storage paths and |
| 1160 | * yields an order-preserved map of storage paths to temporary local file copies. |
| 1161 | * |
| 1162 | * Never modify the returned files since they might be originals, they might be shared |
| 1163 | * among multiple callers of this method, or the backend might internally keep FSFile |
| 1164 | * references for deferred operations. |
| 1165 | * |
| 1166 | * @see FileBackend::getLocalReference() |
| 1167 | * |
| 1168 | * @param array $params Parameters include: |
| 1169 | * - srcs : list of source storage paths |
| 1170 | * - latest : use the latest available data |
| 1171 | * - parallelize : try to do operations in parallel when possible |
| 1172 | * @return array Map of (path name => FSFile or false (missing) or null (error)) |
| 1173 | * @since 1.20 |
| 1174 | */ |
| 1175 | abstract public function getLocalReferenceMulti( array $params ); |
| 1176 | |
| 1177 | /** |
| 1178 | * Get a local copy on disk of the file at a storage path in the backend. |
| 1179 | * The temporary copy will have the same file extension as the source. |
| 1180 | * Temporary files may be purged when the file object falls out of scope. |
| 1181 | * |
| 1182 | * Multiple calls to this method for the same path will create new copies. |
| 1183 | * |
| 1184 | * @param array $params Parameters include: |
| 1185 | * - src : source storage path |
| 1186 | * - latest : use the latest available data |
| 1187 | * @return TempFSFile|null|false Temporary local file copy or false (missing) or null (error) |
| 1188 | */ |
| 1189 | final public function getLocalCopy( array $params ) { |
| 1190 | $tmpFiles = $this->getLocalCopyMulti( [ 'srcs' => [ $params['src'] ] ] + $params ); |
| 1191 | |
| 1192 | return $tmpFiles[$params['src']]; |
| 1193 | } |
| 1194 | |
| 1195 | /** |
| 1196 | * Like getLocalCopy() except it takes an array of storage paths and yields |
| 1197 | * an order preserved-map of storage paths to temporary local file copies. |
| 1198 | * |
| 1199 | * Multiple calls to this method for the same path will create new copies. |
| 1200 | * |
| 1201 | * @see FileBackend::getLocalCopy() |
| 1202 | * |
| 1203 | * @param array $params Parameters include: |
| 1204 | * - srcs : list of source storage paths |
| 1205 | * - latest : use the latest available data |
| 1206 | * - parallelize : try to do operations in parallel when possible |
| 1207 | * @return array Map of (path name => TempFSFile or false (missing) or null (error)) |
| 1208 | * @since 1.20 |
| 1209 | */ |
| 1210 | abstract public function getLocalCopyMulti( array $params ); |
| 1211 | |
| 1212 | /** |
| 1213 | * Return an HTTP URL to a given file that requires no authentication to use. |
| 1214 | * The URL may be pre-authenticated (via some token in the URL) and temporary. |
| 1215 | * This will return null if the backend cannot make an HTTP URL for the file. |
| 1216 | * |
| 1217 | * This is useful for key/value stores when using scripts that seek around |
| 1218 | * large files and those scripts (and the backend) support HTTP Range headers. |
| 1219 | * Otherwise, one would need to use getLocalReference(), which involves loading |
| 1220 | * the entire file on to local disk. |
| 1221 | * |
| 1222 | * @see FileBackend::TEMPURL_ERROR |
| 1223 | * |
| 1224 | * @param array $params Parameters include: |
| 1225 | * - src : source storage path |
| 1226 | * - ttl : lifetime (seconds) if pre-authenticated; default is 1 day |
| 1227 | * @return string|null URL or null (not supported or I/O error) |
| 1228 | * @since 1.21 |
| 1229 | */ |
| 1230 | abstract public function getFileHttpUrl( array $params ); |
| 1231 | |
| 1232 | /** |
| 1233 | * Check if a directory exists at a given storage path |
| 1234 | * |
| 1235 | * For backends using key/value stores, a directory is said to exist whenever |
| 1236 | * there exist any files with paths using the given directory path as a prefix |
| 1237 | * followed by a forward slash. For example, if there is a file called |
| 1238 | * "mwstore://backend/container/dir/path.svg" then directories are said to exist |
| 1239 | * at "mwstore://backend/container" and "mwstore://backend/container/dir". These |
| 1240 | * can be thought of as "virtual" directories. |
| 1241 | * |
| 1242 | * Backends that directly use a filesystem layer might enumerate empty directories. |
| 1243 | * The clean() method should always be used when files are deleted or moved if this |
| 1244 | * is a concern. This is a trade-off to avoid write amplication/contention on file |
| 1245 | * changes or read amplification when calling this method. |
| 1246 | * |
| 1247 | * Storage backends with eventual consistency might return stale data. |
| 1248 | * |
| 1249 | * @see FileBackend::EXISTENCE_ERROR |
| 1250 | * @see FileBackend::clean() |
| 1251 | * |
| 1252 | * @param array $params Parameters include: |
| 1253 | * - dir : storage directory |
| 1254 | * @return bool|null Whether a directory exists or null (I/O error) |
| 1255 | * @since 1.20 |
| 1256 | */ |
| 1257 | abstract public function directoryExists( array $params ); |
| 1258 | |
| 1259 | /** |
| 1260 | * Get an iterator to list *all* directories under a storage directory |
| 1261 | * |
| 1262 | * If the directory is of the form "mwstore://backend/container", |
| 1263 | * then all directories in the container will be listed. |
| 1264 | * If the directory is of form "mwstore://backend/container/dir", |
| 1265 | * then all directories directly under that directory will be listed. |
| 1266 | * Results will be storage directories relative to the given directory. |
| 1267 | * |
| 1268 | * Storage backends with eventual consistency might return stale data. |
| 1269 | * |
| 1270 | * Failures during iteration can result in FileBackendError exceptions (since 1.22). |
| 1271 | * |
| 1272 | * @see FileBackend::LIST_ERROR |
| 1273 | * @see FileBackend::directoryExists() |
| 1274 | * |
| 1275 | * @param array $params Parameters include: |
| 1276 | * - dir : storage directory |
| 1277 | * - topOnly : only return direct child dirs of the directory |
| 1278 | * @return Traversable|array|null Directory list enumerator or null (initial I/O error) |
| 1279 | * @since 1.20 |
| 1280 | */ |
| 1281 | abstract public function getDirectoryList( array $params ); |
| 1282 | |
| 1283 | /** |
| 1284 | * Same as FileBackend::getDirectoryList() except only lists |
| 1285 | * directories that are immediately under the given directory. |
| 1286 | * |
| 1287 | * Storage backends with eventual consistency might return stale data. |
| 1288 | * |
| 1289 | * Failures during iteration can result in FileBackendError exceptions (since 1.22). |
| 1290 | * |
| 1291 | * @see FileBackend::LIST_ERROR |
| 1292 | * @see FileBackend::directoryExists() |
| 1293 | * |
| 1294 | * @param array $params Parameters include: |
| 1295 | * - dir : storage directory |
| 1296 | * @return Traversable|array|null Directory list enumerator or null (initial I/O error) |
| 1297 | * @since 1.20 |
| 1298 | */ |
| 1299 | final public function getTopDirectoryList( array $params ) { |
| 1300 | return $this->getDirectoryList( [ 'topOnly' => true ] + $params ); |
| 1301 | } |
| 1302 | |
| 1303 | /** |
| 1304 | * Get an iterator to list *all* stored files under a storage directory |
| 1305 | * |
| 1306 | * If the directory is of the form "mwstore://backend/container", then all |
| 1307 | * files in the container will be listed. If the directory is of form |
| 1308 | * "mwstore://backend/container/dir", then all files under that directory will |
| 1309 | * be listed. Results will be storage paths relative to the given directory. |
| 1310 | * |
| 1311 | * Storage backends with eventual consistency might return stale data. |
| 1312 | * |
| 1313 | * Failures during iteration can result in FileBackendError exceptions (since 1.22). |
| 1314 | * |
| 1315 | * @see FileBackend::LIST_ERROR |
| 1316 | * |
| 1317 | * @param array $params Parameters include: |
| 1318 | * - dir : storage directory |
| 1319 | * - topOnly : only return direct child files of the directory (since 1.20) |
| 1320 | * - adviseStat : set to true if stat requests will be made on the files (since 1.22) |
| 1321 | * - forWrite : true if the list will inform a write operations (since 1.41) |
| 1322 | * @return Traversable|array|null File list enumerator or null (initial I/O error) |
| 1323 | */ |
| 1324 | abstract public function getFileList( array $params ); |
| 1325 | |
| 1326 | /** |
| 1327 | * Same as FileBackend::getFileList() except only lists |
| 1328 | * files that are immediately under the given directory. |
| 1329 | * |
| 1330 | * Storage backends with eventual consistency might return stale data. |
| 1331 | * |
| 1332 | * Failures during iteration can result in FileBackendError exceptions (since 1.22). |
| 1333 | * |
| 1334 | * @see FileBackend::LIST_ERROR |
| 1335 | * |
| 1336 | * @param array $params Parameters include: |
| 1337 | * - dir : storage directory |
| 1338 | * - adviseStat : set to true if stat requests will be made on the files (since 1.22) |
| 1339 | * @return Traversable|array|null File list enumerator or null on failure |
| 1340 | * @since 1.20 |
| 1341 | */ |
| 1342 | final public function getTopFileList( array $params ) { |
| 1343 | return $this->getFileList( [ 'topOnly' => true ] + $params ); |
| 1344 | } |
| 1345 | |
| 1346 | /** |
| 1347 | * Preload persistent file stat cache and property cache into in-process cache. |
| 1348 | * This should be used when stat calls will be made on a known list of a many files. |
| 1349 | * |
| 1350 | * @see FileBackend::getFileStat() |
| 1351 | * |
| 1352 | * @param array $paths Storage paths |
| 1353 | */ |
| 1354 | abstract public function preloadCache( array $paths ); |
| 1355 | |
| 1356 | /** |
| 1357 | * Invalidate any in-process file stat and property cache. |
| 1358 | * If $paths is given, then only the cache for those files will be cleared. |
| 1359 | * |
| 1360 | * @see FileBackend::getFileStat() |
| 1361 | * |
| 1362 | * @param array|null $paths Storage paths (optional) |
| 1363 | */ |
| 1364 | abstract public function clearCache( array $paths = null ); |
| 1365 | |
| 1366 | /** |
| 1367 | * Preload file stat information (concurrently if possible) into in-process cache. |
| 1368 | * |
| 1369 | * This should be used when stat calls will be made on a known list of a many files. |
| 1370 | * This does not make use of the persistent file stat cache. |
| 1371 | * |
| 1372 | * @see FileBackend::getFileStat() |
| 1373 | * |
| 1374 | * @param array $params Parameters include: |
| 1375 | * - srcs : list of source storage paths |
| 1376 | * - latest : use the latest available data |
| 1377 | * @return bool Whether all requests proceeded without I/O errors (since 1.24) |
| 1378 | * @since 1.23 |
| 1379 | */ |
| 1380 | abstract public function preloadFileStat( array $params ); |
| 1381 | |
| 1382 | /** |
| 1383 | * Lock the files at the given storage paths in the backend. |
| 1384 | * This will either lock all the files or none (on failure). |
| 1385 | * |
| 1386 | * Callers should consider using getScopedFileLocks() instead. |
| 1387 | * |
| 1388 | * @param array $paths Storage paths |
| 1389 | * @param int $type LockManager::LOCK_* constant |
| 1390 | * @param int $timeout Timeout in seconds (0 means non-blocking) (since 1.24) |
| 1391 | * @return StatusValue |
| 1392 | */ |
| 1393 | final public function lockFiles( array $paths, $type, $timeout = 0 ) { |
| 1394 | $paths = array_map( [ __CLASS__, 'normalizeStoragePath' ], $paths ); |
| 1395 | |
| 1396 | return $this->wrapStatus( $this->lockManager->lock( $paths, $type, $timeout ) ); |
| 1397 | } |
| 1398 | |
| 1399 | /** |
| 1400 | * Unlock the files at the given storage paths in the backend. |
| 1401 | * |
| 1402 | * @param array $paths Storage paths |
| 1403 | * @param int $type LockManager::LOCK_* constant |
| 1404 | * @return StatusValue |
| 1405 | */ |
| 1406 | final public function unlockFiles( array $paths, $type ) { |
| 1407 | $paths = array_map( [ __CLASS__, 'normalizeStoragePath' ], $paths ); |
| 1408 | |
| 1409 | return $this->wrapStatus( $this->lockManager->unlock( $paths, $type ) ); |
| 1410 | } |
| 1411 | |
| 1412 | /** |
| 1413 | * Lock the files at the given storage paths in the backend. |
| 1414 | * This will either lock all the files or none (on failure). |
| 1415 | * On failure, the StatusValue object will be updated with errors. |
| 1416 | * |
| 1417 | * Once the return value goes out scope, the locks will be released and |
| 1418 | * the StatusValue updated. Unlock fatals will not change the StatusValue "OK" value. |
| 1419 | * |
| 1420 | * @see ScopedLock::factory() |
| 1421 | * |
| 1422 | * @param array $paths List of storage paths or map of lock types to path lists |
| 1423 | * @param int|string $type LockManager::LOCK_* constant or "mixed" |
| 1424 | * @param StatusValue $status StatusValue to update on lock/unlock |
| 1425 | * @param int $timeout Timeout in seconds (0 means non-blocking) (since 1.24) |
| 1426 | * @return ScopedLock|null RAII-style self-unlocking lock or null on failure |
| 1427 | */ |
| 1428 | final public function getScopedFileLocks( |
| 1429 | array $paths, $type, StatusValue $status, $timeout = 0 |
| 1430 | ) { |
| 1431 | if ( $type === 'mixed' ) { |
| 1432 | foreach ( $paths as &$typePaths ) { |
| 1433 | $typePaths = array_map( [ __CLASS__, 'normalizeStoragePath' ], $typePaths ); |
| 1434 | } |
| 1435 | } else { |
| 1436 | $paths = array_map( [ __CLASS__, 'normalizeStoragePath' ], $paths ); |
| 1437 | } |
| 1438 | |
| 1439 | return ScopedLock::factory( $this->lockManager, $paths, $type, $status, $timeout ); |
| 1440 | } |
| 1441 | |
| 1442 | /** |
| 1443 | * Get an array of scoped locks needed for a batch of file operations. |
| 1444 | * |
| 1445 | * Normally, FileBackend::doOperations() handles locking, unless |
| 1446 | * the 'nonLocking' param is passed in. This function is useful if you |
| 1447 | * want the files to be locked for a broader scope than just when the |
| 1448 | * files are changing. For example, if you need to update DB metadata, |
| 1449 | * you may want to keep the files locked until finished. |
| 1450 | * |
| 1451 | * @see FileBackend::doOperations() |
| 1452 | * |
| 1453 | * @param array $ops List of file operations to FileBackend::doOperations() |
| 1454 | * @param StatusValue $status StatusValue to update on lock/unlock |
| 1455 | * @return ScopedLock|null RAII-style self-unlocking lock or null on failure |
| 1456 | * @since 1.20 |
| 1457 | */ |
| 1458 | abstract public function getScopedLocksForOps( array $ops, StatusValue $status ); |
| 1459 | |
| 1460 | /** |
| 1461 | * Get the root storage path of this backend. |
| 1462 | * All container paths are "subdirectories" of this path. |
| 1463 | * |
| 1464 | * @return string Storage path |
| 1465 | * @since 1.20 |
| 1466 | */ |
| 1467 | final public function getRootStoragePath() { |
| 1468 | return "mwstore://{$this->name}"; |
| 1469 | } |
| 1470 | |
| 1471 | /** |
| 1472 | * Get the storage path for the given container for this backend |
| 1473 | * |
| 1474 | * @param string $container Container name |
| 1475 | * @return string Storage path |
| 1476 | * @since 1.21 |
| 1477 | */ |
| 1478 | final public function getContainerStoragePath( $container ) { |
| 1479 | return $this->getRootStoragePath() . "/{$container}"; |
| 1480 | } |
| 1481 | |
| 1482 | /** |
| 1483 | * Convert FSFile 'src' paths to string paths (with an 'srcRef' field set to the FSFile) |
| 1484 | * |
| 1485 | * The 'srcRef' field keeps any TempFSFile objects in scope for the backend to have it |
| 1486 | * around as long it needs (which may vary greatly depending on configuration) |
| 1487 | * |
| 1488 | * @param array $ops File operation batch for FileBaclend::doOperations() |
| 1489 | * @return array File operation batch |
| 1490 | */ |
| 1491 | protected function resolveFSFileObjects( array $ops ) { |
| 1492 | foreach ( $ops as &$op ) { |
| 1493 | $src = $op['src'] ?? null; |
| 1494 | if ( $src instanceof FSFile ) { |
| 1495 | $op['srcRef'] = $src; |
| 1496 | $op['src'] = $src->getPath(); |
| 1497 | } |
| 1498 | } |
| 1499 | unset( $op ); |
| 1500 | |
| 1501 | return $ops; |
| 1502 | } |
| 1503 | |
| 1504 | /** |
| 1505 | * Check if a given path is a "mwstore://" path. |
| 1506 | * This does not do any further validation or any existence checks. |
| 1507 | * |
| 1508 | * @param string|null $path |
| 1509 | * @return bool |
| 1510 | */ |
| 1511 | final public static function isStoragePath( $path ) { |
| 1512 | return ( strpos( $path ?? '', 'mwstore://' ) === 0 ); |
| 1513 | } |
| 1514 | |
| 1515 | /** |
| 1516 | * Split a storage path into a backend name, a container name, |
| 1517 | * and a relative file path. The relative path may be the empty string. |
| 1518 | * This does not do any path normalization or traversal checks. |
| 1519 | * |
| 1520 | * @param string $storagePath |
| 1521 | * @return array (backend, container, rel object) or (null, null, null) |
| 1522 | */ |
| 1523 | final public static function splitStoragePath( $storagePath ) { |
| 1524 | if ( self::isStoragePath( $storagePath ) ) { |
| 1525 | // Remove the "mwstore://" prefix and split the path |
| 1526 | $parts = explode( '/', substr( $storagePath, 10 ), 3 ); |
| 1527 | if ( count( $parts ) >= 2 && $parts[0] != '' && $parts[1] != '' ) { |
| 1528 | if ( count( $parts ) == 3 ) { |
| 1529 | return $parts; // e.g. "backend/container/path" |
| 1530 | } else { |
| 1531 | return [ $parts[0], $parts[1], '' ]; // e.g. "backend/container" |
| 1532 | } |
| 1533 | } |
| 1534 | } |
| 1535 | |
| 1536 | return [ null, null, null ]; |
| 1537 | } |
| 1538 | |
| 1539 | /** |
| 1540 | * Normalize a storage path by cleaning up directory separators. |
| 1541 | * Returns null if the path is not of the format of a valid storage path. |
| 1542 | * |
| 1543 | * @param string $storagePath |
| 1544 | * @return string|null Normalized storage path or null on failure |
| 1545 | */ |
| 1546 | final public static function normalizeStoragePath( $storagePath ) { |
| 1547 | [ $backend, $container, $relPath ] = self::splitStoragePath( $storagePath ); |
| 1548 | if ( $relPath !== null ) { // must be for this backend |
| 1549 | $relPath = self::normalizeContainerPath( $relPath ); |
| 1550 | if ( $relPath !== null ) { |
| 1551 | return ( $relPath != '' ) |
| 1552 | ? "mwstore://{$backend}/{$container}/{$relPath}" |
| 1553 | : "mwstore://{$backend}/{$container}"; |
| 1554 | } |
| 1555 | } |
| 1556 | |
| 1557 | return null; |
| 1558 | } |
| 1559 | |
| 1560 | /** |
| 1561 | * Get the parent storage directory of a storage path. |
| 1562 | * This returns a path like "mwstore://backend/container", |
| 1563 | * "mwstore://backend/container/...", or null if there is no parent. |
| 1564 | * |
| 1565 | * @param string $storagePath |
| 1566 | * @return string|null Parent storage path or null on failure |
| 1567 | */ |
| 1568 | final public static function parentStoragePath( $storagePath ) { |
| 1569 | // XXX dirname() depends on platform and locale! If nothing enforces that the storage path |
| 1570 | // doesn't contain characters like '\', behavior can vary by platform. We should use |
| 1571 | // explode() instead. |
| 1572 | $storagePath = dirname( $storagePath ); |
| 1573 | [ , , $rel ] = self::splitStoragePath( $storagePath ); |
| 1574 | |
| 1575 | return ( $rel === null ) ? null : $storagePath; |
| 1576 | } |
| 1577 | |
| 1578 | /** |
| 1579 | * Get the final extension from a storage or FS path |
| 1580 | * |
| 1581 | * @param string $path |
| 1582 | * @param string $case One of (rawcase, uppercase, lowercase) (since 1.24) |
| 1583 | * @return string |
| 1584 | */ |
| 1585 | final public static function extensionFromPath( $path, $case = 'lowercase' ) { |
| 1586 | // This will treat a string starting with . as not having an extension, but store paths have |
| 1587 | // to start with 'mwstore://', so "garbage in, garbage out". |
| 1588 | $i = strrpos( $path, '.' ); |
| 1589 | $ext = $i ? substr( $path, $i + 1 ) : ''; |
| 1590 | |
| 1591 | if ( $case === 'lowercase' ) { |
| 1592 | $ext = strtolower( $ext ); |
| 1593 | } elseif ( $case === 'uppercase' ) { |
| 1594 | $ext = strtoupper( $ext ); |
| 1595 | } |
| 1596 | |
| 1597 | return $ext; |
| 1598 | } |
| 1599 | |
| 1600 | /** |
| 1601 | * Check if a relative path has no directory traversals |
| 1602 | * |
| 1603 | * @param string $path |
| 1604 | * @return bool |
| 1605 | * @since 1.20 |
| 1606 | */ |
| 1607 | final public static function isPathTraversalFree( $path ) { |
| 1608 | return ( self::normalizeContainerPath( $path ) !== null ); |
| 1609 | } |
| 1610 | |
| 1611 | /** |
| 1612 | * Build a Content-Disposition header value per RFC 6266. |
| 1613 | * |
| 1614 | * @param string $type One of (attachment, inline) |
| 1615 | * @param string $filename Suggested file name (should not contain slashes) |
| 1616 | * @throws InvalidArgumentException |
| 1617 | * @return string |
| 1618 | * @since 1.20 |
| 1619 | */ |
| 1620 | final public static function makeContentDisposition( $type, $filename = '' ) { |
| 1621 | $parts = []; |
| 1622 | |
| 1623 | $type = strtolower( $type ); |
| 1624 | if ( !in_array( $type, [ 'inline', 'attachment' ] ) ) { |
| 1625 | throw new InvalidArgumentException( "Invalid Content-Disposition type '$type'." ); |
| 1626 | } |
| 1627 | $parts[] = $type; |
| 1628 | |
| 1629 | if ( strlen( $filename ) ) { |
| 1630 | $parts[] = "filename*=UTF-8''" . rawurlencode( basename( $filename ) ); |
| 1631 | } |
| 1632 | |
| 1633 | return implode( ';', $parts ); |
| 1634 | } |
| 1635 | |
| 1636 | /** |
| 1637 | * Validate and normalize a relative storage path. |
| 1638 | * Null is returned if the path involves directory traversal. |
| 1639 | * Traversal is insecure for FS backends and broken for others. |
| 1640 | * |
| 1641 | * This uses the same traversal protection as Title::secureAndSplit(). |
| 1642 | * |
| 1643 | * @param string $path Storage path relative to a container |
| 1644 | * @return string|null Normalized container path or null on failure |
| 1645 | */ |
| 1646 | final protected static function normalizeContainerPath( $path ) { |
| 1647 | // Normalize directory separators |
| 1648 | $path = strtr( $path, '\\', '/' ); |
| 1649 | // Collapse any consecutive directory separators |
| 1650 | $path = preg_replace( '![/]{2,}!', '/', $path ); |
| 1651 | // Remove any leading directory separator |
| 1652 | $path = ltrim( $path, '/' ); |
| 1653 | // Use the same traversal protection as Title::secureAndSplit() |
| 1654 | if ( strpos( $path, '.' ) !== false ) { |
| 1655 | if ( |
| 1656 | $path === '.' || |
| 1657 | $path === '..' || |
| 1658 | strpos( $path, './' ) === 0 || |
| 1659 | strpos( $path, '../' ) === 0 || |
| 1660 | strpos( $path, '/./' ) !== false || |
| 1661 | strpos( $path, '/../' ) !== false |
| 1662 | ) { |
| 1663 | return null; |
| 1664 | } |
| 1665 | } |
| 1666 | |
| 1667 | return $path; |
| 1668 | } |
| 1669 | |
| 1670 | /** |
| 1671 | * Yields the result of the status wrapper callback on either: |
| 1672 | * - StatusValue::newGood() if this method is called without parameters |
| 1673 | * - StatusValue::newFatal() with all parameters to this method if passed in |
| 1674 | * |
| 1675 | * @param mixed ...$args |
| 1676 | * @return StatusValue |
| 1677 | */ |
| 1678 | final protected function newStatus( ...$args ) { |
| 1679 | if ( count( $args ) ) { |
| 1680 | $sv = StatusValue::newFatal( ...$args ); |
| 1681 | } else { |
| 1682 | $sv = StatusValue::newGood(); |
| 1683 | } |
| 1684 | |
| 1685 | return $this->wrapStatus( $sv ); |
| 1686 | } |
| 1687 | |
| 1688 | /** |
| 1689 | * @param StatusValue $sv |
| 1690 | * @return StatusValue Modified status or StatusValue subclass |
| 1691 | */ |
| 1692 | final protected function wrapStatus( StatusValue $sv ) { |
| 1693 | return $this->statusWrapper ? call_user_func( $this->statusWrapper, $sv ) : $sv; |
| 1694 | } |
| 1695 | |
| 1696 | /** |
| 1697 | * @param string $section |
| 1698 | * @return ScopedCallback|null |
| 1699 | */ |
| 1700 | protected function scopedProfileSection( $section ) { |
| 1701 | return $this->profiler ? ( $this->profiler )( $section ) : null; |
| 1702 | } |
| 1703 | |
| 1704 | /** |
| 1705 | * @codeCoverageIgnore Let's not reset output buffering during tests |
| 1706 | */ |
| 1707 | protected function resetOutputBuffer() { |
| 1708 | // XXX According to documentation, ob_get_status() always returns a non-empty array and this |
| 1709 | // condition will always be true |
| 1710 | while ( ob_get_status() ) { |
| 1711 | if ( !ob_end_clean() ) { |
| 1712 | // Could not remove output buffer handler; abort now |
| 1713 | // to avoid getting in some kind of infinite loop. |
| 1714 | break; |
| 1715 | } |
| 1716 | } |
| 1717 | } |
| 1718 | } |