includes/Status.php

   1 <?php
   2 /**
   3  * Generic operation result.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 /**
  24  * Generic operation result class
  25  * Has warning/error list, boolean status and arbitrary value
  26  *
  27  * "Good" means the operation was completed with no warnings or errors.
  28  *
  29  * "OK" means the operation was partially or wholly completed.
  30  *
  31  * An operation which is not OK should have errors so that the user can be
  32  * informed as to what went wrong. Calling the fatal() function sets an error
  33  * message and simultaneously switches off the OK flag.
  34  *
  35  * The recommended pattern for Status objects is to return a Status object
  36  * unconditionally, i.e. both on success and on failure -- so that the
  37  * developer of the calling code is reminded that the function can fail, and
  38  * so that a lack of error-handling will be explicit.
  39  */
  40 class Status {
  41         /** @var StatusValue */
  42         protected $sv;
  43
  44         /** @var mixed */
  45         public $value;
  46         /** @var array Map of (key => bool) to indicate success of each part of batch operations */
  47         public $success = array();
  48         /** @var int Counter for batch operations */
  49         public $successCount = 0;
  50         /** @var int Counter for batch operations */
  51         public $failCount = 0;
  52
  53         /** @var callable */
  54         public $cleanCallback = false;
  55
  56         /**
  57          * @param StatusValue $sv [optional]
  58          */
  59         public function __construct( StatusValue $sv = null ) {
  60                 $this->sv = ( $sv === null ) ? new StatusValue() : $sv;
  61                 // B/C field aliases
  62                 $this->value =& $this->sv->value;
  63                 $this->successCount =& $this->sv->successCount;
  64                 $this->failCount =& $this->sv->failCount;
  65                 $this->success =& $this->sv->success;
  66         }
  67
  68         /**
  69          * Succinct helper method to wrap a StatusValue
  70          *
  71          * This is is useful when formatting StatusValue objects:
  72          * @code
  73          *     $this->getOutput()->addHtml( Status::wrap( $sv )->getHTML() );
  74          * @endcode
  75          *
  76          * @param StatusValue|Status $sv
  77          * @return Status
  78          */
  79         public static function wrap( $sv ) {
  80                 return $sv instanceof Status ? $sv : new self( $sv );
  81         }
  82
  83         /**
  84          * Factory function for fatal errors
  85          *
  86          * @param string|Message $message Message name or object
  87          * @return Status
  88          */
  89         public static function newFatal( $message /*, parameters...*/ ) {
  90                 return new self( call_user_func_array(
  91                         array( 'StatusValue', 'newFatal' ), func_get_args()
  92                 ) );
  93         }
  94
  95         /**
  96          * Factory function for good results
  97          *
  98          * @param mixed $value
  99          * @return Status
 100          */
 101         public static function newGood( $value = null ) {
 102                 $sv = new StatusValue();
 103                 $sv->value = $value;
 104
 105                 return new self( $sv );
 106         }
 107
 108         /**
 109          * Change operation result
 110          *
 111          * @param bool $ok Whether the operation completed
 112          * @param mixed $value
 113          */
 114         public function setResult( $ok, $value = null ) {
 115                 $this->sv->setResult( $ok, $value );
 116         }
 117
 118         /**
 119          * Returns whether the operation completed and didn't have any error or
 120          * warnings
 121          *
 122          * @return bool
 123          */
 124         public function isGood() {
 125                 return $this->sv->isGood();
 126         }
 127
 128         /**
 129          * Returns whether the operation completed
 130          *
 131          * @return bool
 132          */
 133         public function isOK() {
 134                 return $this->sv->isOK();
 135         }
 136
 137         /**
 138          * Add a new warning
 139          *
 140          * @param string|Message $message Message name or object
 141          */
 142         public function warning( $message /*, parameters... */ ) {
 143                 call_user_func_array( array( $this->sv, 'warning' ), func_get_args() );
 144         }
 145
 146         /**
 147          * Add an error, do not set fatal flag
 148          * This can be used for non-fatal errors
 149          *
 150          * @param string|Message $message Message name or object
 151          */
 152         public function error( $message /*, parameters... */ ) {
 153                 call_user_func_array( array( $this->sv, 'error' ), func_get_args() );
 154         }
 155
 156         /**
 157          * Add an error and set OK to false, indicating that the operation
 158          * as a whole was fatal
 159          *
 160          * @param string|Message $message Message name or object
 161          */
 162         public function fatal( $message /*, parameters... */ ) {
 163                 call_user_func_array( array( $this->sv, 'fatal' ), func_get_args() );
 164         }
 165
 166         /**
 167          * @param array $params
 168          * @return array
 169          */
 170         protected function cleanParams( array $params ) {
 171                 if ( !$this->cleanCallback ) {
 172                         return $params;
 173                 }
 174                 $cleanParams = array();
 175                 foreach ( $params as $i => $param ) {
 176                         $cleanParams[$i] = call_user_func( $this->cleanCallback, $param );
 177                 }
 178                 return $cleanParams;
 179         }
 180
 181         /**
 182          * Get the error list as a wikitext formatted list
 183          *
 184          * @param string|bool $shortContext A short enclosing context message name, to
 185          *        be used when there is a single error
 186          * @param string|bool $longContext A long enclosing context message name, for a list
 187          * @return string
 188          */
 189         public function getWikiText( $shortContext = false, $longContext = false ) {
 190                 $rawErrors = $this->sv->getErrors();
 191                 if ( count( $rawErrors ) == 0 ) {
 192                         if ( $this->sv->isOK() ) {
 193                                 $this->sv->fatal( 'internalerror_info',
 194                                         __METHOD__ . " called for a good result, this is incorrect\n" );
 195                         } else {
 196                                 $this->sv->fatal( 'internalerror_info',
 197                                         __METHOD__ . ": Invalid result object: no error text but not OK\n" );
 198                         }
 199                         $rawErrors = $this->sv->getErrors(); // just added a fatal
 200                 }
 201                 if ( count( $rawErrors ) == 1 ) {
 202                         $s = $this->getErrorMessage( $rawErrors[0] )->plain();
 203                         if ( $shortContext ) {
 204                                 $s = wfMessage( $shortContext, $s )->plain();
 205                         } elseif ( $longContext ) {
 206                                 $s = wfMessage( $longContext, "* $s\n" )->plain();
 207                         }
 208                 } else {
 209                         $errors = $this->getErrorMessageArray( $rawErrors );
 210                         foreach ( $errors as &$error ) {
 211                                 $error = $error->plain();
 212                         }
 213                         $s = '* ' . implode( "\n* ", $errors ) . "\n";
 214                         if ( $longContext ) {
 215                                 $s = wfMessage( $longContext, $s )->plain();
 216                         } elseif ( $shortContext ) {
 217                                 $s = wfMessage( $shortContext, "\n$s\n" )->plain();
 218                         }
 219                 }
 220                 return $s;
 221         }
 222
 223         /**
 224          * Get the error list as a Message object
 225          *
 226          * @param string|string[] $shortContext A short enclosing context message name (or an array of
 227          * message names), to be used when there is a single error.
 228          * @param string|string[] $longContext A long enclosing context message name (or an array of
 229          * message names), for a list.
 230          *
 231          * @return Message
 232          */
 233         public function getMessage( $shortContext = false, $longContext = false ) {
 234                 $rawErrors = $this->sv->getErrors();
 235                 if ( count( $rawErrors ) == 0 ) {
 236                         if ( $this->sv->isOK() ) {
 237                                 $this->sv->fatal( 'internalerror_info',
 238                                         __METHOD__ . " called for a good result, this is incorrect\n" );
 239                         } else {
 240                                 $this->sv->fatal( 'internalerror_info',
 241                                         __METHOD__ . ": Invalid result object: no error text but not OK\n" );
 242                         }
 243                         $rawErrors = $this->sv->getErrors(); // just added a fatal
 244                 }
 245                 if ( count( $rawErrors ) == 1 ) {
 246                         $s = $this->getErrorMessage( $rawErrors[0] );
 247                         if ( $shortContext ) {
 248                                 $s = wfMessage( $shortContext, $s );
 249                         } elseif ( $longContext ) {
 250                                 $wrapper = new RawMessage( "* \$1\n" );
 251                                 $wrapper->params( $s )->parse();
 252                                 $s = wfMessage( $longContext, $wrapper );
 253                         }
 254                 } else {
 255                         $msgs = $this->getErrorMessageArray( $rawErrors );
 256                         $msgCount = count( $msgs );
 257
 258                         if ( $shortContext ) {
 259                                 $msgCount++;
 260                         }
 261
 262                         $s = new RawMessage( '* $' . implode( "\n* \$", range( 1, $msgCount ) ) );
 263                         $s->params( $msgs )->parse();
 264
 265                         if ( $longContext ) {
 266                                 $s = wfMessage( $longContext, $s );
 267                         } elseif ( $shortContext ) {
 268                                 $wrapper = new RawMessage( "\n\$1\n", $s );
 269                                 $wrapper->parse();
 270                                 $s = wfMessage( $shortContext, $wrapper );
 271                         }
 272                 }
 273
 274                 return $s;
 275         }
 276
 277         /**
 278          * Return the message for a single error.
 279          * @param mixed $error With an array & two values keyed by
 280          * 'message' and 'params', use those keys-value pairs.
 281          * Otherwise, if its an array, just use the first value as the
 282          * message and the remaining items as the params.
 283          *
 284          * @return Message
 285          */
 286         protected function getErrorMessage( $error ) {
 287                 if ( is_array( $error ) ) {
 288                         if ( isset( $error['message'] ) && $error['message'] instanceof Message ) {
 289                                 $msg = $error['message'];
 290                         } elseif ( isset( $error['message'] ) && isset( $error['params'] ) ) {
 291                                 $msg = wfMessage( $error['message'],
 292                                         array_map( 'wfEscapeWikiText', $this->cleanParams( $error['params'] ) ) );
 293                         } else {
 294                                 $msgName = array_shift( $error );
 295                                 $msg = wfMessage( $msgName,
 296                                         array_map( 'wfEscapeWikiText', $this->cleanParams( $error ) ) );
 297                         }
 298                 } else {
 299                         $msg = wfMessage( $error );
 300                 }
 301                 return $msg;
 302         }
 303
 304         /**
 305          * Get the error message as HTML. This is done by parsing the wikitext error
 306          * message.
 307          * @param string $shortContext A short enclosing context message name, to
 308          *        be used when there is a single error
 309          * @param string $longContext A long enclosing context message name, for a list
 310          * @return string
 311          */
 312         public function getHTML( $shortContext = false, $longContext = false ) {
 313                 $text = $this->getWikiText( $shortContext, $longContext );
 314                 $out = MessageCache::singleton()->parse( $text, null, true, true );
 315                 return $out instanceof ParserOutput ? $out->getText() : $out;
 316         }
 317
 318         /**
 319          * Return an array with a Message object for each error.
 320          * @param array $errors
 321          * @return Message[]
 322          */
 323         protected function getErrorMessageArray( $errors ) {
 324                 return array_map( array( $this, 'getErrorMessage' ), $errors );
 325         }
 326
 327         /**
 328          * Merge another status object into this one
 329          *
 330          * @param Status $other Other Status object
 331          * @param bool $overwriteValue Whether to override the "value" member
 332          */
 333         public function merge( $other, $overwriteValue = false ) {
 334                 $this->sv->merge( $other->sv, $overwriteValue );
 335         }
 336
 337         /**
 338          * Get the list of errors (but not warnings)
 339          *
 340          * @return array A list in which each entry is an array with a message key as its first element.
 341          *         The remaining array elements are the message parameters.
 342          * @deprecated 1.25
 343          */
 344         public function getErrorsArray() {
 345                 return $this->getStatusArray( 'error' );
 346         }
 347
 348         /**
 349          * Get the list of warnings (but not errors)
 350          *
 351          * @return array A list in which each entry is an array with a message key as its first element.
 352          *         The remaining array elements are the message parameters.
 353          * @deprecated 1.25
 354          */
 355         public function getWarningsArray() {
 356                 return $this->getStatusArray( 'warning' );
 357         }
 358
 359         /**
 360          * Returns a list of status messages of the given type (or all if false)
 361          *
 362          * @note: this handles RawMessage poorly
 363          *
 364          * @param string|bool $type
 365          * @return array
 366          */
 367         protected function getStatusArray( $type = false ) {
 368                 $result = array();
 369
 370                 foreach ( $this->sv->getErrors() as $error ) {
 371                         if ( $type === false || $error['type'] === $type ) {
 372                                 if ( $error['message'] instanceof MessageSpecifier ) {
 373                                         $result[] = array_merge(
 374                                                 array( $error['message']->getKey() ),
 375                                                 $error['message']->getParams()
 376                                         );
 377                                 } elseif ( $error['params'] ) {
 378                                         $result[] = array_merge( array( $error['message'] ), $error['params'] );
 379                                 } else {
 380                                         $result[] = array( $error['message'] );
 381                                 }
 382                         }
 383                 }
 384
 385                 return $result;
 386         }
 387
 388         /**
 389          * Returns a list of status messages of the given type, with message and
 390          * params left untouched, like a sane version of getStatusArray
 391          *
 392          * @param string $type
 393          *
 394          * @return array
 395          */
 396         public function getErrorsByType( $type ) {
 397                 return $this->sv->getErrorsByType( $type );
 398         }
 399
 400         /**
 401          * Returns true if the specified message is present as a warning or error
 402          *
 403          * @param string|Message $message Message key or object to search for
 404          *
 405          * @return bool
 406          */
 407         public function hasMessage( $message ) {
 408                 return $this->sv->hasMessage( $message );
 409         }
 410
 411         /**
 412          * If the specified source message exists, replace it with the specified
 413          * destination message, but keep the same parameters as in the original error.
 414          *
 415          * Note, due to the lack of tools for comparing Message objects, this
 416          * function will not work when using a Message object as the search parameter.
 417          *
 418          * @param Message|string $source Message key or object to search for
 419          * @param Message|string $dest Replacement message key or object
 420          * @return bool Return true if the replacement was done, false otherwise.
 421          */
 422         public function replaceMessage( $source, $dest ) {
 423                 return $this->sv->replaceMessage( $source, $dest );
 424         }
 425
 426         /**
 427          * @return mixed
 428          */
 429         public function getValue() {
 430                 return $this->sv->getValue();
 431         }
 432
 433         /**
 434          * Backwards compatibility logic
 435          *
 436          * @param string $name
 437          */
 438         function __get( $name ) {
 439                 if ( $name === 'ok' ) {
 440                         return $this->sv->isOK();
 441                 } elseif ( $name === 'errors' ) {
 442                         return $this->sv->getErrors();
 443                 }
 444                 throw new Exception( "Cannot get '$name' property." );
 445         }
 446
 447         /**
 448          * Backwards compatibility logic
 449          *
 450          * @param string $name
 451          * @param mixed $value
 452          */
 453         function __set( $name, $value ) {
 454                 if ( $name === 'ok' ) {
 455                         $this->sv->setOK( $value );
 456                 } elseif ( !property_exists( $this, $name ) ) {
 457                         // Caller is using undeclared ad-hoc properties
 458                         $this->$name = $value;
 459                 } else {
 460                         throw new Exception( "Cannot set '$name' property." );
 461                 }
 462         }
 463
 464         /**
 465          * @return string
 466          */
 467         public function __toString() {
 468                 return $this->sv->__toString();
 469         }
 470
 471         /**
 472          * Don't save the callback when serializing, because Closures can't be
 473          * serialized and we're going to clear it in __wakeup anyway.
 474          */
 475         function __sleep() {
 476                 $keys = array_keys( get_object_vars( $this ) );
 477                 return array_diff( $keys, array( 'cleanCallback' ) );
 478         }
 479
 480         /**
 481          * Sanitize the callback parameter on wakeup, to avoid arbitrary execution.
 482          */
 483         function __wakeup() {
 484                 $this->cleanCallback = false;
 485         }
 486 }