includes/Status.php

   1 <?php
   2
   3 /**
   4  * Generic operation result class
   5  * Has warning/error list, boolean status and arbitrary value
   6  *
   7  * "Good" means the operation was completed with no warnings or errors.
   8  *
   9  * "OK" means the operation was partially or wholly completed.
  10  *
  11  * An operation which is not OK should have errors so that the user can be
  12  * informed as to what went wrong. Calling the fatal() function sets an error
  13  * message and simultaneously switches off the OK flag.
  14  */
  15 class Status {
  16         var $ok = true;
  17         var $value;
  18
  19         /** Counters for batch operations */
  20         var $successCount = 0, $failCount = 0;
  21
  22         /*semi-private*/ var $errors = array();
  23         /*semi-private*/ var $cleanCallback = false;
  24
  25         /**
  26          * Factory function for fatal errors
  27          *
  28          * @param $message String: message name
  29          */
  30         static function newFatal( $message /*, parameters...*/ ) {
  31                 $params = func_get_args();
  32                 $result = new self;
  33                 call_user_func_array( array( &$result, 'error' ), $params );
  34                 $result->ok = false;
  35                 return $result;
  36         }
  37
  38         /**
  39          * Factory function for good results
  40          *
  41          * @param $value Mixed
  42          */
  43         static function newGood( $value = null ) {
  44                 $result = new self;
  45                 $result->value = $value;
  46                 return $result;
  47         }
  48
  49         /**
  50          * Change operation result
  51          *
  52          * @param $ok Boolean: whether to operation completed
  53          * @param $value Mixed
  54          */
  55         function setResult( $ok, $value = null ) {
  56                 $this->ok = $ok;
  57                 $this->value = $value;
  58         }
  59
  60         /**
  61          * Returns whether the operation completed and didn't have any error or
  62          * warnings
  63          *
  64          * @return Boolean
  65          */
  66         function isGood() {
  67                 return $this->ok && !$this->errors;
  68         }
  69
  70         /**
  71          * Returns whether the operation completed
  72          *
  73          * @return Boolean
  74          */
  75         function isOK() {
  76                 return $this->ok;
  77         }
  78
  79         /**
  80          * Add a new warning
  81          *
  82          * @param $message String: message name
  83          */
  84         function warning( $message /*, parameters... */ ) {
  85                 $params = array_slice( func_get_args(), 1 );
  86                 $this->errors[] = array(
  87                         'type' => 'warning',
  88                         'message' => $message,
  89                         'params' => $params );
  90         }
  91
  92         /**
  93          * Add an error, do not set fatal flag
  94          * This can be used for non-fatal errors
  95          *
  96          * @param $message String: message name
  97          */
  98         function error( $message /*, parameters... */ ) {
  99                 $params = array_slice( func_get_args(), 1 );
 100                 $this->errors[] = array(
 101                         'type' => 'error',
 102                         'message' => $message,
 103                         'params' => $params );
 104         }
 105
 106         /**
 107          * Add an error and set OK to false, indicating that the operation
 108          * as a whole was fatal
 109          *
 110          * @param $message String: message name
 111          */
 112         function fatal( $message /*, parameters... */ ) {
 113                 $params = array_slice( func_get_args(), 1 );
 114                 $this->errors[] = array(
 115                         'type' => 'error',
 116                         'message' => $message,
 117                         'params' => $params );
 118                 $this->ok = false;
 119         }
 120
 121         /**
 122          * Sanitize the callback parameter on wakeup, to avoid arbitrary execution.
 123          */
 124         function __wakeup() {
 125                 $this->cleanCallback = false;
 126         }
 127
 128         protected function cleanParams( $params ) {
 129                 if ( !$this->cleanCallback ) {
 130                         return $params;
 131                 }
 132                 $cleanParams = array();
 133                 foreach ( $params as $i => $param ) {
 134                         $cleanParams[$i] = call_user_func( $this->cleanCallback, $param );
 135                 }
 136                 return $cleanParams;
 137         }
 138
 139         protected function getItemXML( $item ) {
 140                 $params = $this->cleanParams( $item['params'] );
 141                 $xml = "<{$item['type']}>\n" .
 142                         Xml::element( 'message', null, $item['message'] ) . "\n" .
 143                         Xml::element( 'text', null, wfMsgReal( $item['message'], $params ) ) ."\n";
 144                 foreach ( $params as $param ) {
 145                         $xml .= Xml::element( 'param', null, $param );
 146                 }
 147                 $xml .= "</{$this->type}>\n";
 148                 return $xml;
 149         }
 150
 151         /**
 152          * Get the error list as XML
 153          */
 154         function getXML() {
 155                 $xml = "<errors>\n";
 156                 foreach ( $this->errors as $error ) {
 157                         $xml .= $this->getItemXML( $error );
 158                 }
 159                 $xml .= "</errors>\n";
 160                 return $xml;
 161         }
 162
 163         /**
 164          * Get the error list as a wikitext formatted list
 165          *
 166          * @param $shortContext String: a short enclosing context message name, to
 167          *        be used when there is a single error
 168          * @param $longContext String: a long enclosing context message name, for a list
 169          * @return String
 170          */
 171         function getWikiText( $shortContext = false, $longContext = false ) {
 172                 if ( count( $this->errors ) == 0 ) {
 173                         if ( $this->ok ) {
 174                                 $this->fatal( 'internalerror_info',
 175                                         __METHOD__." called for a good result, this is incorrect\n" );
 176                         } else {
 177                                 $this->fatal( 'internalerror_info',
 178                                         __METHOD__.": Invalid result object: no error text but not OK\n" );
 179                         }
 180                 }
 181                 if ( count( $this->errors ) == 1 ) {
 182                         $s = $this->getWikiTextForError( $this->errors[0], $this->errors[0]  );
 183                         if ( $shortContext ) {
 184                                 $s = wfMsgNoTrans( $shortContext, $s );
 185                         } elseif ( $longContext ) {
 186                                 $s = wfMsgNoTrans( $longContext, "* $s\n" );
 187                         }
 188                 } else {
 189                         $s = '* '. implode("\n* ",
 190                                 $this->getWikiTextArray( $this->errors ) ) . "\n";
 191                         if ( $longContext ) {
 192                                 $s = wfMsgNoTrans( $longContext, $s );
 193                         } elseif ( $shortContext ) {
 194                                 $s = wfMsgNoTrans( $shortContext, "\n$s\n" );
 195                         }
 196                 }
 197                 return $s;
 198         }
 199
 200         /**
 201          * Return the wiki text for a single error.
 202          * @param $error Mixed With an array & two values keyed by
 203          * 'message' and 'params', use those keys-value pairs.
 204          * Otherwise, if its an array, just use the first value as the
 205          * message and the remaining items as the params.
 206          *
 207          * @return String
 208          */
 209         protected function getWikiTextForError( $error ) {
 210                 if ( is_array( $error ) ) {
 211                         if ( isset( $error['message'] ) && isset( $error['params'] ) ) {
 212                                 return wfMsgReal( $error['message'],
 213                                         array_map( 'wfEscapeWikiText', $this->cleanParams( $error['params'] ) ),
 214                                         true, false, false );
 215                         } else {
 216                                 $message = array_shift($error);
 217                                 return wfMsgReal( $message,
 218                                         array_map( 'wfEscapeWikiText', $this->cleanParams( $error ) ),
 219                                         true, false, false );
 220                         }
 221                 } else {
 222                         return wfMsgReal( $error, array(), true, false, false);
 223                 }
 224         }
 225
 226         /**
 227          * Return an array with the wikitext for each item in the array.
 228          * @param $errors Array
 229          * @return Array
 230          */
 231         function getWikiTextArray( $errors ) {
 232                 return array_map( array( $this, 'getWikiTextForError' ), $errors );
 233         }
 234
 235         /**
 236          * Merge another status object into this one
 237          *
 238          * @param $other Other Status object
 239          * @param $overwriteValue Boolean: whether to override the "value" member
 240          */
 241         function merge( $other, $overwriteValue = false ) {
 242                 $this->errors = array_merge( $this->errors, $other->errors );
 243                 $this->ok = $this->ok && $other->ok;
 244                 if ( $overwriteValue ) {
 245                         $this->value = $other->value;
 246                 }
 247                 $this->successCount += $other->successCount;
 248                 $this->failCount += $other->failCount;
 249         }
 250
 251         /**
 252          * Get the list of errors (but not warnings)
 253          *
 254          * @return Array
 255          */
 256         function getErrorsArray() {
 257                 return $this->getStatusArray( "error" );
 258         }
 259
 260         /**
 261          * Get the list of warnings (but not errors)
 262          *
 263          * @return Array
 264          */
 265         function getWarningsArray() {
 266                 return $this->getStatusArray( "warning" );
 267         }
 268
 269         /**
 270          * Returns a list of status messages of the given type
 271          * @param $type String
 272          *
 273          * @return Array
 274          */
 275         protected function getStatusArray( $type ) {
 276                 $result = array();
 277                 foreach ( $this->errors as $error ) {
 278                         if ( $error['type'] === $type ) {
 279                                 if( $error['params'] ) {
 280                                         $result[] = array_merge( array( $error['message'] ), $error['params'] );
 281                                 } else {
 282                                         $result[] = $error['message'];
 283                                 }
 284                         }
 285                 }
 286                 return $result;
 287         }
 288         /**
 289          * Returns true if the specified message is present as a warning or error
 290          *
 291          * @param $msg String: message name
 292          * @return Boolean
 293          */
 294         function hasMessage( $msg ) {
 295                 foreach ( $this->errors as $error ) {
 296                         if ( $error['message'] === $msg ) {
 297                                 return true;
 298                         }
 299                 }
 300                 return false;
 301         }
 302
 303         /**
 304          * If the specified source message exists, replace it with the specified
 305          * destination message, but keep the same parameters as in the original error.
 306          *
 307          * Return true if the replacement was done, false otherwise.
 308          */
 309         function replaceMessage( $source, $dest ) {
 310                 $replaced = false;
 311                 foreach ( $this->errors as $index => $error ) {
 312                         if ( $error['message'] === $source ) {
 313                                 $this->errors[$index]['message'] = $dest;
 314                                 $replaced = true;
 315                         }
 316                 }
 317                 return $replaced;
 318         }
 319
 320         /**
 321          * Backward compatibility function for WikiError -> Status migration
 322          *
 323          * @return String
 324          */
 325         public function getMessage() {
 326                 return $this->getWikiText();
 327         }
 328 }