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 extends StatusValue {
  41         /** @var callable */
  42         public $cleanCallback = false;
  43
  44         /**
  45          * Succinct helper method to wrap a StatusValue
  46          *
  47          * This is is useful when formatting StatusValue objects:
  48          * @code
  49          *     $this->getOutput()->addHtml( Status::wrap( $sv )->getHTML() );
  50          * @endcode
  51          *
  52          * @param StatusValue|Status $sv
  53          * @return Status
  54          */
  55         public static function wrap( $sv ) {
  56                 if ( $sv instanceof static ) {
  57                         return $sv;
  58                 }
  59
  60                 $result = new static();
  61                 $result->ok =& $sv->ok;
  62                 $result->errors =& $sv->errors;
  63                 $result->value =& $sv->value;
  64                 $result->successCount =& $sv->successCount;
  65                 $result->failCount =& $sv->failCount;
  66                 $result->success =& $sv->success;
  67
  68                 return $result;
  69         }
  70
  71         /**
  72          * Backwards compatibility logic
  73          *
  74          * @param string $name
  75          * @return mixed
  76          * @throws RuntimeException
  77          */
  78         function __get( $name ) {
  79                 if ( $name === 'ok' ) {
  80                         return $this->isOK();
  81                 } elseif ( $name === 'errors' ) {
  82                         return $this->getErrors();
  83                 }
  84
  85                 throw new RuntimeException( "Cannot get '$name' property." );
  86         }
  87
  88         /**
  89          * Change operation result
  90          * Backwards compatibility logic
  91          *
  92          * @param string $name
  93          * @param mixed $value
  94          * @throws RuntimeException
  95          */
  96         function __set( $name, $value ) {
  97                 if ( $name === 'ok' ) {
  98                         $this->setOK( $value );
  99                 } elseif ( !property_exists( $this, $name ) ) {
 100                         // Caller is using undeclared ad-hoc properties
 101                         $this->$name = $value;
 102                 } else {
 103                         throw new RuntimeException( "Cannot set '$name' property." );
 104                 }
 105         }
 106
 107         /**
 108          * Splits this Status object into two new Status objects, one which contains only
 109          * the error messages, and one that contains the warnings, only. The returned array is
 110          * defined as:
 111          * [
 112          *     0 => object(Status) # the Status with error messages, only
 113          *     1 => object(Status) # The Status with warning messages, only
 114          * ]
 115          *
 116          * @return Status[]
 117          */
 118         public function splitByErrorType() {
 119                 list( $errorsOnlyStatus, $warningsOnlyStatus ) = parent::splitByErrorType();
 120                 $errorsOnlyStatus->cleanCallback =
 121                         $warningsOnlyStatus->cleanCallback = $this->cleanCallback;
 122
 123                 return [ $errorsOnlyStatus, $warningsOnlyStatus ];
 124         }
 125
 126         /**
 127          * Returns the wrapped StatusValue object
 128          * @return StatusValue
 129          * @since 1.27
 130          */
 131         public function getStatusValue() {
 132                 return $this;
 133         }
 134
 135         /**
 136          * @param array $params
 137          * @return array
 138          */
 139         protected function cleanParams( array $params ) {
 140                 if ( !$this->cleanCallback ) {
 141                         return $params;
 142                 }
 143                 $cleanParams = [];
 144                 foreach ( $params as $i => $param ) {
 145                         $cleanParams[$i] = call_user_func( $this->cleanCallback, $param );
 146                 }
 147                 return $cleanParams;
 148         }
 149
 150         /**
 151          * @param string|Language|null $lang Language to use for processing
 152          *  messages, or null to default to the user language.
 153          * @return Language
 154          */
 155         protected function languageFromParam( $lang ) {
 156                 global $wgLang;
 157
 158                 if ( $lang === null ) {
 159                         // @todo: Use RequestContext::getMain()->getLanguage() instead
 160                         return $wgLang;
 161                 } elseif ( $lang instanceof Language || $lang instanceof StubUserLang ) {
 162                         return $lang;
 163                 } else {
 164                         return Language::factory( $lang );
 165                 }
 166         }
 167
 168         /**
 169          * Get the error list as a wikitext formatted list
 170          *
 171          * @param string|bool $shortContext A short enclosing context message name, to
 172          *        be used when there is a single error
 173          * @param string|bool $longContext A long enclosing context message name, for a list
 174          * @param string|Language $lang Language to use for processing messages
 175          * @return string
 176          */
 177         public function getWikiText( $shortContext = false, $longContext = false, $lang = null ) {
 178                 $lang = $this->languageFromParam( $lang );
 179
 180                 $rawErrors = $this->getErrors();
 181                 if ( count( $rawErrors ) == 0 ) {
 182                         if ( $this->isOK() ) {
 183                                 $this->fatal( 'internalerror_info',
 184                                         __METHOD__ . " called for a good result, this is incorrect\n" );
 185                         } else {
 186                                 $this->fatal( 'internalerror_info',
 187                                         __METHOD__ . ": Invalid result object: no error text but not OK\n" );
 188                         }
 189                         $rawErrors = $this->getErrors(); // just added a fatal
 190                 }
 191                 if ( count( $rawErrors ) == 1 ) {
 192                         $s = $this->getErrorMessage( $rawErrors[0], $lang )->plain();
 193                         if ( $shortContext ) {
 194                                 $s = wfMessage( $shortContext, $s )->inLanguage( $lang )->plain();
 195                         } elseif ( $longContext ) {
 196                                 $s = wfMessage( $longContext, "* $s\n" )->inLanguage( $lang )->plain();
 197                         }
 198                 } else {
 199                         $errors = $this->getErrorMessageArray( $rawErrors, $lang );
 200                         foreach ( $errors as &$error ) {
 201                                 $error = $error->plain();
 202                         }
 203                         $s = '* ' . implode( "\n* ", $errors ) . "\n";
 204                         if ( $longContext ) {
 205                                 $s = wfMessage( $longContext, $s )->inLanguage( $lang )->plain();
 206                         } elseif ( $shortContext ) {
 207                                 $s = wfMessage( $shortContext, "\n$s\n" )->inLanguage( $lang )->plain();
 208                         }
 209                 }
 210                 return $s;
 211         }
 212
 213         /**
 214          * Get a bullet list of the errors as a Message object.
 215          *
 216          * $shortContext and $longContext can be used to wrap the error list in some text.
 217          * $shortContext will be preferred when there is a single error; $longContext will be
 218          * preferred when there are multiple ones. In either case, $1 will be replaced with
 219          * the list of errors.
 220          *
 221          * $shortContext is assumed to use $1 as an inline parameter: if there is a single item,
 222          * it will not be made into a list; if there are multiple items, newlines will be inserted
 223          * around the list.
 224          * $longContext is assumed to use $1 as a standalone parameter; it will always receive a list.
 225          *
 226          * If both parameters are missing, and there is only one error, no bullet will be added.
 227          *
 228          * @param string|string[]|bool $shortContext A message name or an array of message names.
 229          * @param string|string[]|bool $longContext A message name or an array of message names.
 230          * @param string|Language $lang Language to use for processing messages
 231          * @return Message
 232          */
 233         public function getMessage( $shortContext = false, $longContext = false, $lang = null ) {
 234                 $lang = $this->languageFromParam( $lang );
 235
 236                 $rawErrors = $this->getErrors();
 237                 if ( count( $rawErrors ) == 0 ) {
 238                         if ( $this->isOK() ) {
 239                                 $this->fatal( 'internalerror_info',
 240                                         __METHOD__ . " called for a good result, this is incorrect\n" );
 241                         } else {
 242                                 $this->fatal( 'internalerror_info',
 243                                         __METHOD__ . ": Invalid result object: no error text but not OK\n" );
 244                         }
 245                         $rawErrors = $this->getErrors(); // just added a fatal
 246                 }
 247                 if ( count( $rawErrors ) == 1 ) {
 248                         $s = $this->getErrorMessage( $rawErrors[0], $lang );
 249                         if ( $shortContext ) {
 250                                 $s = wfMessage( $shortContext, $s )->inLanguage( $lang );
 251                         } elseif ( $longContext ) {
 252                                 $wrapper = new RawMessage( "* \$1\n" );
 253                                 $wrapper->params( $s )->parse();
 254                                 $s = wfMessage( $longContext, $wrapper )->inLanguage( $lang );
 255                         }
 256                 } else {
 257                         $msgs = $this->getErrorMessageArray( $rawErrors, $lang );
 258                         $msgCount = count( $msgs );
 259
 260                         $s = new RawMessage( '* $' . implode( "\n* \$", range( 1, $msgCount ) ) );
 261                         $s->params( $msgs )->parse();
 262
 263                         if ( $longContext ) {
 264                                 $s = wfMessage( $longContext, $s )->inLanguage( $lang );
 265                         } elseif ( $shortContext ) {
 266                                 $wrapper = new RawMessage( "\n\$1\n", [ $s ] );
 267                                 $wrapper->parse();
 268                                 $s = wfMessage( $shortContext, $wrapper )->inLanguage( $lang );
 269                         }
 270                 }
 271
 272                 return $s;
 273         }
 274
 275         /**
 276          * Return the message for a single error
 277          *
 278          * The code string can be used a message key with per-language versions.
 279          * If $error is an array, the "params" field is a list of parameters for the message.
 280          *
 281          * @param array|string $error Code string or (key: code string, params: string[]) map
 282          * @param string|Language $lang Language to use for processing messages
 283          * @return Message
 284          */
 285         protected function getErrorMessage( $error, $lang = null ) {
 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                 } elseif ( is_string( $error ) ) {
 298                         $msg = wfMessage( $error );
 299                 } else {
 300                         throw new UnexpectedValueException( "Got " . get_class( $error ) . " for key." );
 301                 }
 302
 303                 $msg->inLanguage( $this->languageFromParam( $lang ) );
 304                 return $msg;
 305         }
 306
 307         /**
 308          * Get the error message as HTML. This is done by parsing the wikitext error message
 309          * @param string|bool $shortContext A short enclosing context message name, to
 310          *        be used when there is a single error
 311          * @param string|bool $longContext A long enclosing context message name, for a list
 312          * @param string|Language|null $lang Language to use for processing messages
 313          * @return string
 314          */
 315         public function getHTML( $shortContext = false, $longContext = false, $lang = null ) {
 316                 $lang = $this->languageFromParam( $lang );
 317                 $text = $this->getWikiText( $shortContext, $longContext, $lang );
 318                 $out = MessageCache::singleton()->parse( $text, null, true, true, $lang );
 319                 return $out instanceof ParserOutput ? $out->getText() : $out;
 320         }
 321
 322         /**
 323          * Return an array with a Message object for each error.
 324          * @param array $errors
 325          * @param string|Language $lang Language to use for processing messages
 326          * @return Message[]
 327          */
 328         protected function getErrorMessageArray( $errors, $lang = null ) {
 329                 $lang = $this->languageFromParam( $lang );
 330                 return array_map( function ( $e ) use ( $lang ) {
 331                         return $this->getErrorMessage( $e, $lang );
 332                 }, $errors );
 333         }
 334
 335         /**
 336          * Get the list of errors (but not warnings)
 337          *
 338          * @return array A list in which each entry is an array with a message key as its first element.
 339          *         The remaining array elements are the message parameters.
 340          * @deprecated since 1.25
 341          */
 342         public function getErrorsArray() {
 343                 return $this->getStatusArray( 'error' );
 344         }
 345
 346         /**
 347          * Get the list of warnings (but not errors)
 348          *
 349          * @return array A list in which each entry is an array with a message key as its first element.
 350          *         The remaining array elements are the message parameters.
 351          * @deprecated since 1.25
 352          */
 353         public function getWarningsArray() {
 354                 return $this->getStatusArray( 'warning' );
 355         }
 356
 357         /**
 358          * Returns a list of status messages of the given type (or all if false)
 359          *
 360          * @note: this handles RawMessage poorly
 361          *
 362          * @param string|bool $type
 363          * @return array
 364          */
 365         protected function getStatusArray( $type = false ) {
 366                 $result = [];
 367
 368                 foreach ( $this->getErrors() as $error ) {
 369                         if ( $type === false || $error['type'] === $type ) {
 370                                 if ( $error['message'] instanceof MessageSpecifier ) {
 371                                         $result[] = array_merge(
 372                                                 [ $error['message']->getKey() ],
 373                                                 $error['message']->getParams()
 374                                         );
 375                                 } elseif ( $error['params'] ) {
 376                                         $result[] = array_merge( [ $error['message'] ], $error['params'] );
 377                                 } else {
 378                                         $result[] = [ $error['message'] ];
 379                                 }
 380                         }
 381                 }
 382
 383                 return $result;
 384         }
 385
 386         /**
 387          * Don't save the callback when serializing, because Closures can't be
 388          * serialized and we're going to clear it in __wakeup anyway.
 389          */
 390         function __sleep() {
 391                 $keys = array_keys( get_object_vars( $this ) );
 392                 return array_diff( $keys, [ 'cleanCallback' ] );
 393         }
 394
 395         /**
 396          * Sanitize the callback parameter on wakeup, to avoid arbitrary execution.
 397          */
 398         function __wakeup() {
 399                 $this->cleanCallback = false;
 400         }
 401 }