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 bool */
  42         public $ok = true;
  43
  44         /** @var mixed */
  45         public $value;
  46
  47         /** Counters for batch operations */
  48         /** @var int */
  49         public $successCount = 0;
  50
  51         /** @var int */
  52         public $failCount = 0;
  53
  54         /** Array to indicate which items of the batch operations were successful */
  55         /** @var array */
  56         public $success = array();
  57
  58         /** @var array */
  59         public $errors = array();
  60
  61         /** @var callable */
  62         public $cleanCallback = false;
  63
  64         /**
  65          * Factory function for fatal errors
  66          *
  67          * @param string|Message $message message name or object
  68          * @return Status
  69          */
  70         static function newFatal( $message /*, parameters...*/ ) {
  71                 $params = func_get_args();
  72                 $result = new self;
  73                 call_user_func_array( array( &$result, 'error' ), $params );
  74                 $result->ok = false;
  75                 return $result;
  76         }
  77
  78         /**
  79          * Factory function for good results
  80          *
  81          * @param mixed $value
  82          * @return Status
  83          */
  84         static function newGood( $value = null ) {
  85                 $result = new self;
  86                 $result->value = $value;
  87                 return $result;
  88         }
  89
  90         /**
  91          * Change operation result
  92          *
  93          * @param bool $ok Whether the operation completed
  94          * @param mixed $value
  95          */
  96         public function setResult( $ok, $value = null ) {
  97                 $this->ok = $ok;
  98                 $this->value = $value;
  99         }
 100
 101         /**
 102          * Returns whether the operation completed and didn't have any error or
 103          * warnings
 104          *
 105          * @return bool
 106          */
 107         public function isGood() {
 108                 return $this->ok && !$this->errors;
 109         }
 110
 111         /**
 112          * Returns whether the operation completed
 113          *
 114          * @return bool
 115          */
 116         public function isOK() {
 117                 return $this->ok;
 118         }
 119
 120         /**
 121          * Add a new warning
 122          *
 123          * @param string|Message $message Message name or object
 124          */
 125         public function warning( $message /*, parameters... */ ) {
 126                 $params = array_slice( func_get_args(), 1 );
 127                 $this->errors[] = array(
 128                         'type' => 'warning',
 129                         'message' => $message,
 130                         'params' => $params );
 131         }
 132
 133         /**
 134          * Add an error, do not set fatal flag
 135          * This can be used for non-fatal errors
 136          *
 137          * @param string|Message $message Message name or object
 138          */
 139         public function error( $message /*, parameters... */ ) {
 140                 $params = array_slice( func_get_args(), 1 );
 141                 $this->errors[] = array(
 142                         'type' => 'error',
 143                         'message' => $message,
 144                         'params' => $params );
 145         }
 146
 147         /**
 148          * Add an error and set OK to false, indicating that the operation
 149          * as a whole was fatal
 150          *
 151          * @param string|Message $message Message name or object
 152          */
 153         public function fatal( $message /*, parameters... */ ) {
 154                 $params = array_slice( func_get_args(), 1 );
 155                 $this->errors[] = array(
 156                         'type' => 'error',
 157                         'message' => $message,
 158                         'params' => $params );
 159                 $this->ok = false;
 160         }
 161
 162         /**
 163          * Sanitize the callback parameter on wakeup, to avoid arbitrary execution.
 164          */
 165         public function __wakeup() {
 166                 $this->cleanCallback = false;
 167         }
 168
 169         /**
 170          * @param array $params
 171          * @return array
 172          */
 173         protected function cleanParams( $params ) {
 174                 if ( !$this->cleanCallback ) {
 175                         return $params;
 176                 }
 177                 $cleanParams = array();
 178                 foreach ( $params as $i => $param ) {
 179                         $cleanParams[$i] = call_user_func( $this->cleanCallback, $param );
 180                 }
 181                 return $cleanParams;
 182         }
 183
 184         /**
 185          * Get the error list as a wikitext formatted list
 186          *
 187          * @param string $shortContext A short enclosing context message name, to
 188          *        be used when there is a single error
 189          * @param string $longContext A long enclosing context message name, for a list
 190          * @return string
 191          */
 192         public function getWikiText( $shortContext = false, $longContext = false ) {
 193                 if ( count( $this->errors ) == 0 ) {
 194                         if ( $this->ok ) {
 195                                 $this->fatal( 'internalerror_info',
 196                                         __METHOD__ . " called for a good result, this is incorrect\n" );
 197                         } else {
 198                                 $this->fatal( 'internalerror_info',
 199                                         __METHOD__ . ": Invalid result object: no error text but not OK\n" );
 200                         }
 201                 }
 202                 if ( count( $this->errors ) == 1 ) {
 203                         $s = $this->getErrorMessage( $this->errors[0] )->plain();
 204                         if ( $shortContext ) {
 205                                 $s = wfMessage( $shortContext, $s )->plain();
 206                         } elseif ( $longContext ) {
 207                                 $s = wfMessage( $longContext, "* $s\n" )->plain();
 208                         }
 209                 } else {
 210                         $errors = $this->getErrorMessageArray( $this->errors );
 211                         foreach ( $errors as &$error ) {
 212                                 $error = $error->plain();
 213                         }
 214                         $s = '* ' . implode( "\n* ", $errors ) . "\n";
 215                         if ( $longContext ) {
 216                                 $s = wfMessage( $longContext, $s )->plain();
 217                         } elseif ( $shortContext ) {
 218                                 $s = wfMessage( $shortContext, "\n$s\n" )->plain();
 219                         }
 220                 }
 221                 return $s;
 222         }
 223
 224         /**
 225          * Get the error list as a Message object
 226          *
 227          * @param string|string[] $shortContext A short enclosing context message name (or an array of
 228          * message names), to be used when there is a single error.
 229          * @param string|string[] $longContext A long enclosing context message name (or an array of
 230          * message names), for a list.
 231          *
 232          * @return Message
 233          */
 234         public function getMessage( $shortContext = false, $longContext = false ) {
 235                 if ( count( $this->errors ) == 0 ) {
 236                         if ( $this->ok ) {
 237                                 $this->fatal( 'internalerror_info',
 238                                         __METHOD__ . " called for a good result, this is incorrect\n" );
 239                         } else {
 240                                 $this->fatal( 'internalerror_info',
 241                                         __METHOD__ . ": Invalid result object: no error text but not OK\n" );
 242                         }
 243                 }
 244                 if ( count( $this->errors ) == 1 ) {
 245                         $s = $this->getErrorMessage( $this->errors[0] );
 246                         if ( $shortContext ) {
 247                                 $s = wfMessage( $shortContext, $s );
 248                         } elseif ( $longContext ) {
 249                                 $wrapper = new RawMessage( "* \$1\n" );
 250                                 $wrapper->params( $s )->parse();
 251                                 $s = wfMessage( $longContext, $wrapper );
 252                         }
 253                 } else {
 254                         $msgs = $this->getErrorMessageArray( $this->errors );
 255                         $msgCount = count( $msgs );
 256
 257                         if ( $shortContext ) {
 258                                 $msgCount++;
 259                         }
 260
 261                         $s = new RawMessage( '* $' . implode( "\n* \$", range( 1, $msgCount ) ) );
 262                         $s->params( $msgs )->parse();
 263
 264                         if ( $longContext ) {
 265                                 $s = wfMessage( $longContext, $s );
 266                         } elseif ( $shortContext ) {
 267                                 $wrapper = new RawMessage( "\n\$1\n", $s );
 268                                 $wrapper->parse();
 269                                 $s = wfMessage( $shortContext, $wrapper );
 270                         }
 271                 }
 272
 273                 return $s;
 274         }
 275
 276         /**
 277          * Return the message for a single error.
 278          * @param mixed $error With an array & two values keyed by
 279          * 'message' and 'params', use those keys-value pairs.
 280          * Otherwise, if its an array, just use the first value as the
 281          * message and the remaining items as the params.
 282          *
 283          * @return string
 284          */
 285         protected function getErrorMessage( $error ) {
 286                 if ( is_array( $error ) ) {
 287                         if ( isset( $error['message'] ) && $error['message'] instanceof Message ) {
 288                                 $msg = $error['message'];
 289                         } elseif ( isset( $error['message'] ) && isset( $error['params'] ) ) {
 290                                 $msg = wfMessage( $error['message'],
 291                                         array_map( 'wfEscapeWikiText', $this->cleanParams( $error['params'] ) ) );
 292                         } else {
 293                                 $msgName = array_shift( $error );
 294                                 $msg = wfMessage( $msgName,
 295                                         array_map( 'wfEscapeWikiText', $this->cleanParams( $error ) ) );
 296                         }
 297                 } else {
 298                         $msg = wfMessage( $error );
 299                 }
 300                 return $msg;
 301         }
 302
 303         /**
 304          * Get the error message as HTML. This is done by parsing the wikitext error
 305          * message.
 306          * @param string $shortContext A short enclosing context message name, to
 307          *        be used when there is a single error
 308          * @param string $longContext A long enclosing context message name, for a list
 309          * @return string
 310          */
 311         public function getHTML( $shortContext = false, $longContext = false ) {
 312                 $text = $this->getWikiText( $shortContext, $longContext );
 313                 $out = MessageCache::singleton()->parse( $text, null, true, true );
 314                 return $out instanceof ParserOutput ? $out->getText() : $out;
 315         }
 316
 317         /**
 318          * Return an array with the wikitext for each item in the array.
 319          * @param array $errors
 320          * @return array
 321          */
 322         protected function getErrorMessageArray( $errors ) {
 323                 return array_map( array( $this, 'getErrorMessage' ), $errors );
 324         }
 325
 326         /**
 327          * Merge another status object into this one
 328          *
 329          * @param Status $other Other Status object
 330          * @param bool $overwriteValue Whether to override the "value" member
 331          */
 332         public function merge( $other, $overwriteValue = false ) {
 333                 $this->errors = array_merge( $this->errors, $other->errors );
 334                 $this->ok = $this->ok && $other->ok;
 335                 if ( $overwriteValue ) {
 336                         $this->value = $other->value;
 337                 }
 338                 $this->successCount += $other->successCount;
 339                 $this->failCount += $other->failCount;
 340         }
 341
 342         /**
 343          * Get the list of errors (but not warnings)
 344          *
 345          * @return array A list in which each entry is an array with a message key as its first element.
 346          *         The remaining array elements are the message parameters.
 347          */
 348         public function getErrorsArray() {
 349                 return $this->getStatusArray( "error" );
 350         }
 351
 352         /**
 353          * Get the list of warnings (but not errors)
 354          *
 355          * @return array A list in which each entry is an array with a message key as its first element.
 356          *         The remaining array elements are the message parameters.
 357          */
 358         public function getWarningsArray() {
 359                 return $this->getStatusArray( "warning" );
 360         }
 361
 362         /**
 363          * Returns a list of status messages of the given type
 364          * @param string $type
 365          * @return array
 366          */
 367         protected function getStatusArray( $type ) {
 368                 $result = array();
 369                 foreach ( $this->errors as $error ) {
 370                         if ( $error['type'] === $type ) {
 371                                 if ( $error['message'] instanceof Message ) {
 372                                         $result[] = array_merge(
 373                                                 array( $error['message']->getKey() ),
 374                                                 $error['message']->getParams()
 375                                         );
 376                                 } elseif ( $error['params'] ) {
 377                                         $result[] = array_merge( array( $error['message'] ), $error['params'] );
 378                                 } else {
 379                                         $result[] = array( $error['message'] );
 380                                 }
 381                         }
 382                 }
 383
 384                 return $result;
 385         }
 386
 387         /**
 388          * Returns a list of status messages of the given type, with message and
 389          * params left untouched, like a sane version of getStatusArray
 390          *
 391          * @param string $type
 392          *
 393          * @return array
 394          */
 395         public function getErrorsByType( $type ) {
 396                 $result = array();
 397                 foreach ( $this->errors as $error ) {
 398                         if ( $error['type'] === $type ) {
 399                                 $result[] = $error;
 400                         }
 401                 }
 402                 return $result;
 403         }
 404
 405         /**
 406          * Returns true if the specified message is present as a warning or error
 407          *
 408          * @param string|Message $message Message key or object to search for
 409          *
 410          * @return bool
 411          */
 412         public function hasMessage( $message ) {
 413                 if ( $message instanceof Message ) {
 414                         $message = $message->getKey();
 415                 }
 416                 foreach ( $this->errors as $error ) {
 417                         if ( $error['message'] instanceof Message
 418                                 && $error['message']->getKey() === $message
 419                         ) {
 420                                 return true;
 421                         } elseif ( $error['message'] === $message ) {
 422                                 return true;
 423                         }
 424                 }
 425                 return false;
 426         }
 427
 428         /**
 429          * If the specified source message exists, replace it with the specified
 430          * destination message, but keep the same parameters as in the original error.
 431          *
 432          * Note, due to the lack of tools for comparing Message objects, this
 433          * function will not work when using a Message object as the search parameter.
 434          *
 435          * @param Message|string $source Message key or object to search for
 436          * @param Message|string $dest Replacement message key or object
 437          * @return bool Return true if the replacement was done, false otherwise.
 438          */
 439         public function replaceMessage( $source, $dest ) {
 440                 $replaced = false;
 441                 foreach ( $this->errors as $index => $error ) {
 442                         if ( $error['message'] === $source ) {
 443                                 $this->errors[$index]['message'] = $dest;
 444                                 $replaced = true;
 445                         }
 446                 }
 447                 return $replaced;
 448         }
 449
 450         /**
 451          * @return mixed
 452          */
 453         public function getValue() {
 454                 return $this->value;
 455         }
 456 }