includes/GlobalFunctions.php

   1 <?php
   2
   3 /**
   4  * Global functions used everywhere
   5  * @package MediaWiki
   6  */
   7
   8 /**
   9  * Some globals and requires needed
  10  */
  11
  12 /**
  13  * Total number of articles
  14  * @global integer $wgNumberOfArticles
  15  */
  16 $wgNumberOfArticles = -1; # Unset
  17 /**
  18  * Total number of views
  19  * @global integer $wgTotalViews
  20  */
  21 $wgTotalViews = -1;
  22 /**
  23  * Total number of edits
  24  * @global integer $wgTotalEdits
  25  */
  26 $wgTotalEdits = -1;
  27
  28
  29 require_once( 'DatabaseFunctions.php' );
  30 require_once( 'UpdateClasses.php' );
  31 require_once( 'LogPage.php' );
  32 require_once( 'normal/UtfNormalUtil.php' );
  33
  34 /**
  35  * Compatibility functions
  36  * PHP <4.3.x is not actively supported; 4.1.x and 4.2.x might or might not work.
  37  * <4.1.x will not work, as we use a number of features introduced in 4.1.0
  38  * such as the new autoglobals.
  39  */
  40 if( !function_exists('iconv') ) {
  41         # iconv support is not in the default configuration and so may not be present.
  42         # Assume will only ever use utf-8 and iso-8859-1.
  43         # This will *not* work in all circumstances.
  44         function iconv( $from, $to, $string ) {
  45                 if(strcasecmp( $from, $to ) == 0) return $string;
  46                 if(strcasecmp( $from, 'utf-8' ) == 0) return utf8_decode( $string );
  47                 if(strcasecmp( $to, 'utf-8' ) == 0) return utf8_encode( $string );
  48                 return $string;
  49         }
  50 }
  51
  52 if( !function_exists('file_get_contents') ) {
  53         # Exists in PHP 4.3.0+
  54         function file_get_contents( $filename ) {
  55                 return implode( '', file( $filename ) );
  56         }
  57 }
  58
  59 if( !function_exists('is_a') ) {
  60         # Exists in PHP 4.2.0+
  61         function is_a( $object, $class_name ) {
  62                 return
  63                         (strcasecmp( get_class( $object ), $class_name ) == 0) ||
  64                          is_subclass_of( $object, $class_name );
  65         }
  66 }
  67
  68 # UTF-8 substr function based on a PHP manual comment
  69 if ( !function_exists( 'mb_substr' ) ) {
  70         function mb_substr( $str, $start ) {
  71                 preg_match_all( '/./us', $str, $ar );
  72
  73                 if( func_num_args() >= 3 ) {
  74                         $end = func_get_arg( 2 );
  75                         return join( '', array_slice( $ar[0], $start, $end ) );
  76                 } else {
  77                         return join( '', array_slice( $ar[0], $start ) );
  78                 }
  79         }
  80 }
  81
  82 if( !function_exists( 'floatval' ) ) {
  83         /**
  84          * First defined in PHP 4.2.0
  85          * @param mixed $var;
  86          * @return float
  87          */
  88         function floatval( $var ) {
  89                 return (float)$var;
  90         }
  91 }
  92
  93 /**
  94  * Where as we got a random seed
  95  * @var bool $wgTotalViews
  96  */
  97 $wgRandomSeeded = false;
  98
  99 /**
 100  * Seed Mersenne Twister
 101  * Only necessary in PHP < 4.2.0
 102  *
 103  * @return bool
 104  */
 105 function wfSeedRandom() {
 106         global $wgRandomSeeded;
 107
 108         if ( ! $wgRandomSeeded && version_compare( phpversion(), '4.2.0' ) < 0 ) {
 109                 $seed = hexdec(substr(md5(microtime()),-8)) & 0x7fffffff;
 110                 mt_srand( $seed );
 111                 $wgRandomSeeded = true;
 112         }
 113 }
 114
 115 /**
 116  * Get a random decimal value between 0 and 1, in a way
 117  * not likely to give duplicate values for any realistic
 118  * number of articles.
 119  *
 120  * @return string
 121  */
 122 function wfRandom() {
 123         # The maximum random value is "only" 2^31-1, so get two random
 124         # values to reduce the chance of dupes
 125         $max = mt_getrandmax();
 126         $rand = number_format( (mt_rand() * $max + mt_rand())
 127                 / $max / $max, 12, '.', '' );
 128         return $rand;
 129 }
 130
 131 /**
 132  * We want / and : to be included as literal characters in our title URLs.
 133  * %2F in the page titles seems to fatally break for some reason.
 134  *
 135  * @param string $s
 136  * @return string
 137 */
 138 function wfUrlencode ( $s ) {
 139         $s = urlencode( $s );
 140         $s = preg_replace( '/%3[Aa]/', ':', $s );
 141         $s = preg_replace( '/%2[Ff]/', '/', $s );
 142
 143         return $s;
 144 }
 145
 146 /**
 147  * Sends a line to the debug log if enabled or, optionally, to a comment in output.
 148  * In normal operation this is a NOP.
 149  *
 150  * Controlling globals:
 151  * $wgDebugLogFile - points to the log file
 152  * $wgProfileOnly - if set, normal debug messages will not be recorded.
 153  * $wgDebugRawPage - if false, 'action=raw' hits will not result in debug output.
 154  * $wgDebugComments - if on, some debug items may appear in comments in the HTML output.
 155  *
 156  * @param string $text
 157  * @param bool $logonly Set true to avoid appearing in HTML when $wgDebugComments is set
 158  */
 159 function wfDebug( $text, $logonly = false ) {
 160         global $wgOut, $wgDebugLogFile, $wgDebugComments, $wgProfileOnly, $wgDebugRawPage;
 161
 162         # Check for raw action using $_GET not $wgRequest, since the latter might not be initialised yet
 163         if ( isset( $_GET['action'] ) && $_GET['action'] == 'raw' && !$wgDebugRawPage ) {
 164                 return;
 165         }
 166
 167         if ( isset( $wgOut ) && $wgDebugComments && !$logonly ) {
 168                 $wgOut->debug( $text );
 169         }
 170         if ( '' != $wgDebugLogFile && !$wgProfileOnly ) {
 171                 # Strip unprintables; they can switch terminal modes when binary data
 172                 # gets dumped, which is pretty annoying.
 173                 $text = preg_replace( '![\x00-\x08\x0b\x0c\x0e-\x1f]!', ' ', $text );
 174                 @error_log( $text, 3, $wgDebugLogFile );
 175         }
 176 }
 177
 178 /**
 179  * Log for database errors
 180  * @param string $text Database error message.
 181  */
 182 function wfLogDBError( $text ) {
 183         global $wgDBerrorLog;
 184         if ( $wgDBerrorLog ) {
 185                 $text = date('D M j G:i:s T Y') . "\t".$text;
 186                 error_log( $text, 3, $wgDBerrorLog );
 187         }
 188 }
 189
 190 /**
 191  * @todo document
 192  */
 193 function logProfilingData() {
 194         global $wgRequestTime, $wgDebugLogFile, $wgDebugRawPage, $wgRequest;
 195         global $wgProfiling, $wgProfileStack, $wgProfileLimit, $wgUser;
 196         $now = wfTime();
 197
 198         list( $usec, $sec ) = explode( ' ', $wgRequestTime );
 199         $start = (float)$sec + (float)$usec;
 200         $elapsed = $now - $start;
 201         if ( $wgProfiling ) {
 202                 $prof = wfGetProfilingOutput( $start, $elapsed );
 203                 $forward = '';
 204                 if( !empty( $_SERVER['HTTP_X_FORWARDED_FOR'] ) )
 205                         $forward = ' forwarded for ' . $_SERVER['HTTP_X_FORWARDED_FOR'];
 206                 if( !empty( $_SERVER['HTTP_CLIENT_IP'] ) )
 207                         $forward .= ' client IP ' . $_SERVER['HTTP_CLIENT_IP'];
 208                 if( !empty( $_SERVER['HTTP_FROM'] ) )
 209                         $forward .= ' from ' . $_SERVER['HTTP_FROM'];
 210                 if( $forward )
 211                         $forward = "\t(proxied via {$_SERVER['REMOTE_ADDR']}{$forward})";
 212                 if( $wgUser->isAnon() )
 213                         $forward .= ' anon';
 214                 $log = sprintf( "%s\t%04.3f\t%s\n",
 215                   gmdate( 'YmdHis' ), $elapsed,
 216                   urldecode( $_SERVER['REQUEST_URI'] . $forward ) );
 217                 if ( '' != $wgDebugLogFile && ( $wgRequest->getVal('action') != 'raw' || $wgDebugRawPage ) ) {
 218                         error_log( $log . $prof, 3, $wgDebugLogFile );
 219                 }
 220         }
 221 }
 222
 223 /**
 224  * Check if the wiki read-only lock file is present. This can be used to lock
 225  * off editing functions, but doesn't guarantee that the database will not be
 226  * modified.
 227  * @return bool
 228  */
 229 function wfReadOnly() {
 230         global $wgReadOnlyFile, $wgReadOnly;
 231
 232         if ( $wgReadOnly ) {
 233                 return true;
 234         }
 235         if ( '' == $wgReadOnlyFile ) {
 236                 return false;
 237         }
 238
 239         // Set $wgReadOnly and unset $wgReadOnlyFile, for faster access next time
 240         if ( is_file( $wgReadOnlyFile ) ) {
 241                 $wgReadOnly = true;
 242         } else {
 243                 $wgReadOnly = false;
 244         }
 245         $wgReadOnlyFile = '';
 246         return $wgReadOnly;
 247 }
 248
 249
 250 /**
 251  * Get a message from anywhere, for the current user language
 252  *
 253  * @param string
 254  */
 255 function wfMsg( $key ) {
 256         $args = func_get_args();
 257         array_shift( $args );
 258         return wfMsgReal( $key, $args, true );
 259 }
 260
 261 /**
 262  * Get a message from anywhere, for the current global language
 263  */
 264 function wfMsgForContent( $key ) {
 265         global $wgForceUIMsgAsContentMsg;
 266         $args = func_get_args();
 267         array_shift( $args );
 268         $forcontent = true;
 269         if( is_array( $wgForceUIMsgAsContentMsg ) &&
 270                 in_array( $key, $wgForceUIMsgAsContentMsg ) )
 271                 $forcontent = false;
 272         return wfMsgReal( $key, $args, true, $forcontent );
 273 }
 274
 275 /**
 276  * Get a message from the language file, for the UI elements
 277  */
 278 function wfMsgNoDB( $key ) {
 279         $args = func_get_args();
 280         array_shift( $args );
 281         return wfMsgReal( $key, $args, false );
 282 }
 283
 284 /**
 285  * Get a message from the language file, for the content
 286  */
 287 function wfMsgNoDBForContent( $key ) {
 288         global $wgForceUIMsgAsContentMsg;
 289         $args = func_get_args();
 290         array_shift( $args );
 291         $forcontent = true;
 292         if( is_array( $wgForceUIMsgAsContentMsg ) &&
 293                 in_array( $key, $wgForceUIMsgAsContentMsg ) )
 294                 $forcontent = false;
 295         return wfMsgReal( $key, $args, false, $forcontent );
 296 }
 297
 298
 299 /**
 300  * Really get a message
 301  */
 302 function wfMsgReal( $key, $args, $useDB, $forContent=false ) {
 303         $fname = 'wfMsgReal';
 304         wfProfileIn( $fname );
 305
 306         $message = wfMsgGetKey( $key, $useDB, $forContent );
 307         $message = wfMsgReplaceArgs( $message, $args );
 308         wfProfileOut( $fname );
 309         return $message;
 310 }
 311
 312 /**
 313  * Fetch a message string value, but don't replace any keys yet.
 314  * @param string $key
 315  * @param bool $useDB
 316  * @param bool $forContent
 317  * @return string
 318  * @access private
 319  */
 320 function wfMsgGetKey( $key, $useDB, $forContent = false ) {
 321         global $wgParser, $wgMsgParserOptions;
 322         global $wgContLang, $wgLanguageCode;
 323         global $wgMessageCache, $wgLang;
 324
 325         if( is_object( $wgMessageCache ) ) {
 326                 $message = $wgMessageCache->get( $key, $useDB, $forContent );
 327         } else {
 328                 if( $forContent ) {
 329                         $lang = &$wgContLang;
 330                 } else {
 331                         $lang = &$wgLang;
 332                 }
 333
 334                 wfSuppressWarnings();
 335
 336                 if( is_object( $lang ) ) {
 337                         $message = $lang->getMessage( $key );
 338                 } else {
 339                         $message = '';
 340                 }
 341                 wfRestoreWarnings();
 342                 if(!$message)
 343                         $message = Language::getMessage($key);
 344                 if(strstr($message, '{{' ) !== false) {
 345                         $message = $wgParser->transformMsg($message, $wgMsgParserOptions);
 346                 }
 347         }
 348         return $message;
 349 }
 350
 351 /**
 352  * Replace message parameter keys on the given formatted output.
 353  *
 354  * @param string $message
 355  * @param array $args
 356  * @return string
 357  * @access private
 358  */
 359 function wfMsgReplaceArgs( $message, $args ) {
 360         static $replacementKeys = array( '$1', '$2', '$3', '$4', '$5', '$6', '$7', '$8', '$9' );
 361
 362         # Fix windows line-endings
 363         # Some messages are split with explode("\n", $msg)
 364         $message = str_replace( "\r", '', $message );
 365
 366         # Replace arguments
 367         if( count( $args ) ) {
 368                 $message = str_replace( $replacementKeys, $args, $message );
 369         }
 370         return $message;
 371 }
 372
 373 /**
 374  * Return an HTML-escaped version of a message.
 375  * Parameter replacements, if any, are done *after* the HTML-escaping,
 376  * so parameters may contain HTML (eg links or form controls). Be sure
 377  * to pre-escape them if you really do want plaintext, or just wrap
 378  * the whole thing in htmlspecialchars().
 379  *
 380  * @param string $key
 381  * @param string ... parameters
 382  * @return string
 383  */
 384 function wfMsgHtml( $key ) {
 385         $args = func_get_args();
 386         array_shift( $args );
 387         return wfMsgReplaceArgs( htmlspecialchars( wfMsgGetKey( $key, true ) ), $args );
 388 }
 389
 390 /**
 391  * Just like exit() but makes a note of it.
 392  * Commits open transactions except if the error parameter is set
 393  */
 394 function wfAbruptExit( $error = false ){
 395         global $wgLoadBalancer;
 396         static $called = false;
 397         if ( $called ){
 398                 exit();
 399         }
 400         $called = true;
 401
 402         if( function_exists( 'debug_backtrace' ) ){ // PHP >= 4.3
 403                 $bt = debug_backtrace();
 404                 for($i = 0; $i < count($bt) ; $i++){
 405                         $file = $bt[$i]['file'];
 406                         $line = $bt[$i]['line'];
 407                         wfDebug("WARNING: Abrupt exit in $file at line $line\n");
 408                 }
 409         } else {
 410                 wfDebug('WARNING: Abrupt exit\n');
 411         }
 412         if ( !$error ) {
 413                 $wgLoadBalancer->closeAll();
 414         }
 415         exit();
 416 }
 417
 418 /**
 419  * @todo document
 420  */
 421 function wfErrorExit() {
 422         wfAbruptExit( true );
 423 }
 424
 425 /**
 426  * Die with a backtrace
 427  * This is meant as a debugging aid to track down where bad data comes from.
 428  * Shouldn't be used in production code except maybe in "shouldn't happen" areas.
 429  *
 430  * @param string $msg Message shown when dieing.
 431  */
 432 function wfDebugDieBacktrace( $msg = '' ) {
 433         global $wgCommandLineMode;
 434
 435         $backtrace = wfBacktrace();
 436         if ( $backtrace !== false ) {
 437                 if ( $wgCommandLineMode ) {
 438                         $msg .= "\nBacktrace:\n$backtrace";
 439                 } else {
 440                         $msg .= "\n<p>Backtrace:</p>\n$backtrace";
 441                 }
 442          }
 443          echo $msg;
 444          die( -1 );
 445 }
 446
 447 function wfBacktrace() {
 448         global $wgCommandLineMode;
 449         if ( !function_exists( 'debug_backtrace' ) ) {
 450                 return false;
 451         }
 452
 453         if ( $wgCommandLineMode ) {
 454                 $msg = '';
 455         } else {
 456                 $msg = "<ul>\n";
 457         }
 458         $backtrace = debug_backtrace();
 459         foreach( $backtrace as $call ) {
 460                 if( isset( $call['file'] ) ) {
 461                         $f = explode( DIRECTORY_SEPARATOR, $call['file'] );
 462                         $file = $f[count($f)-1];
 463                 } else {
 464                         $file = '-';
 465                 }
 466                 if( isset( $call['line'] ) ) {
 467                         $line = $call['line'];
 468                 } else {
 469                         $line = '-';
 470                 }
 471                 if ( $wgCommandLineMode ) {
 472                         $msg .= "$file line $line calls ";
 473                 } else {
 474                         $msg .= '<li>' . $file . ' line ' . $line . ' calls ';
 475                 }
 476                 if( !empty( $call['class'] ) ) $msg .= $call['class'] . '::';
 477                 $msg .= $call['function'] . '()';
 478
 479                 if ( $wgCommandLineMode ) {
 480                         $msg .= "\n";
 481                 } else {
 482                         $msg .= "</li>\n";
 483                 }
 484         }
 485         if ( $wgCommandLineMode ) {
 486                 $msg .= "\n";
 487         } else {
 488                 $msg .= "</ul>\n";
 489         }
 490
 491         return $msg;
 492 }
 493
 494
 495 /* Some generic result counters, pulled out of SearchEngine */
 496
 497
 498 /**
 499  * @todo document
 500  */
 501 function wfShowingResults( $offset, $limit ) {
 502         global $wgLang;
 503         return wfMsg( 'showingresults', $wgLang->formatNum( $limit ), $wgLang->formatNum( $offset+1 ) );
 504 }
 505
 506 /**
 507  * @todo document
 508  */
 509 function wfShowingResultsNum( $offset, $limit, $num ) {
 510         global $wgLang;
 511         return wfMsg( 'showingresultsnum', $wgLang->formatNum( $limit ), $wgLang->formatNum( $offset+1 ), $wgLang->formatNum( $num ) );
 512 }
 513
 514 /**
 515  * @todo document
 516  */
 517 function wfViewPrevNext( $offset, $limit, $link, $query = '', $atend = false ) {
 518         global $wgUser, $wgLang;
 519         $fmtLimit = $wgLang->formatNum( $limit );
 520         $prev = wfMsg( 'prevn', $fmtLimit );
 521         $next = wfMsg( 'nextn', $fmtLimit );
 522
 523         if( is_object( $link ) ) {
 524                 $title =& $link;
 525         } else {
 526                 $title = Title::newFromText( $link );
 527                 if( is_null( $title ) ) {
 528                         return false;
 529                 }
 530         }
 531
 532         $sk = $wgUser->getSkin();
 533         if ( 0 != $offset ) {
 534                 $po = $offset - $limit;
 535                 if ( $po < 0 ) { $po = 0; }
 536                 $q = "limit={$limit}&offset={$po}";
 537                 if ( '' != $query ) { $q .= '&'.$query; }
 538                 $plink = '<a href="' . $title->escapeLocalUrl( $q ) . "\">{$prev}</a>";
 539         } else { $plink = $prev; }
 540
 541         $no = $offset + $limit;
 542         $q = 'limit='.$limit.'&offset='.$no;
 543         if ( '' != $query ) { $q .= '&'.$query; }
 544
 545         if ( $atend ) {
 546                 $nlink = $next;
 547         } else {
 548                 $nlink = '<a href="' . $title->escapeLocalUrl( $q ) . "\">{$next}</a>";
 549         }
 550         $nums = wfNumLink( $offset, 20, $title, $query ) . ' | ' .
 551           wfNumLink( $offset, 50, $title, $query ) . ' | ' .
 552           wfNumLink( $offset, 100, $title, $query ) . ' | ' .
 553           wfNumLink( $offset, 250, $title, $query ) . ' | ' .
 554           wfNumLink( $offset, 500, $title, $query );
 555
 556         return wfMsg( 'viewprevnext', $plink, $nlink, $nums );
 557 }
 558
 559 /**
 560  * @todo document
 561  */
 562 function wfNumLink( $offset, $limit, &$title, $query = '' ) {
 563         global $wgUser, $wgLang;
 564         if ( '' == $query ) { $q = ''; }
 565         else { $q = $query.'&'; }
 566         $q .= 'limit='.$limit.'&offset='.$offset;
 567
 568         $fmtLimit = $wgLang->formatNum( $limit );
 569         $s = '<a href="' . $title->escapeLocalUrl( $q ) . "\">{$fmtLimit}</a>";
 570         return $s;
 571 }
 572
 573 /**
 574  * @todo document
 575  * @todo FIXME: we may want to blacklist some broken browsers
 576  *
 577  * @return bool Whereas client accept gzip compression
 578  */
 579 function wfClientAcceptsGzip() {
 580         global $wgUseGzip;
 581         if( $wgUseGzip ) {
 582                 # FIXME: we may want to blacklist some broken browsers
 583                 if( preg_match(
 584                         '/\bgzip(?:;(q)=([0-9]+(?:\.[0-9]+)))?\b/',
 585                         $_SERVER['HTTP_ACCEPT_ENCODING'],
 586                         $m ) ) {
 587                         if( isset( $m[2] ) && ( $m[1] == 'q' ) && ( $m[2] == 0 ) ) return false;
 588                         wfDebug( " accepts gzip\n" );
 589                         return true;
 590                 }
 591         }
 592         return false;
 593 }
 594
 595 /**
 596  * Yay, more global functions!
 597  */
 598 function wfCheckLimits( $deflimit = 50, $optionname = 'rclimit' ) {
 599         global $wgRequest;
 600         return $wgRequest->getLimitOffset( $deflimit, $optionname );
 601 }
 602
 603 /**
 604  * Escapes the given text so that it may be output using addWikiText()
 605  * without any linking, formatting, etc. making its way through. This
 606  * is achieved by substituting certain characters with HTML entities.
 607  * As required by the callers, <nowiki> is not used. It currently does
 608  * not filter out characters which have special meaning only at the
 609  * start of a line, such as "*".
 610  *
 611  * @param string $text Text to be escaped
 612  */
 613 function wfEscapeWikiText( $text ) {
 614         $text = str_replace(
 615                 array( '[',             '|',      '\'',    'ISBN '        , '://'         , "\n=", '{{' ),
 616                 array( '&#91;', '&#124;', '&#39;', 'ISBN&#32;', '&#58;//' , "\n&#61;", '&#123;&#123;' ),
 617                 htmlspecialchars($text) );
 618         return $text;
 619 }
 620
 621 /**
 622  * @todo document
 623  */
 624 function wfQuotedPrintable( $string, $charset = '' ) {
 625         # Probably incomplete; see RFC 2045
 626         if( empty( $charset ) ) {
 627                 global $wgInputEncoding;
 628                 $charset = $wgInputEncoding;
 629         }
 630         $charset = strtoupper( $charset );
 631         $charset = str_replace( 'ISO-8859', 'ISO8859', $charset ); // ?
 632
 633         $illegal = '\x00-\x08\x0b\x0c\x0e-\x1f\x7f-\xff=';
 634         $replace = $illegal . '\t ?_';
 635         if( !preg_match( "/[$illegal]/", $string ) ) return $string;
 636         $out = "=?$charset?Q?";
 637         $out .= preg_replace( "/([$replace])/e", 'sprintf("=%02X",ord("$1"))', $string );
 638         $out .= '?=';
 639         return $out;
 640 }
 641
 642 /**
 643  * Returns an escaped string suitable for inclusion in a string literal
 644  * for JavaScript source code.
 645  * Illegal control characters are assumed not to be present.
 646  *
 647  * @param string $string
 648  * @return string
 649  */
 650 function wfEscapeJsString( $string ) {
 651         // See ECMA 262 section 7.8.4 for string literal format
 652         $pairs = array(
 653                 "\\" => "\\\\",
 654                 "\"" => "\\\"",
 655                 '\'' => '\\\'',
 656                 "\n" => "\\n",
 657                 "\r" => "\\r",
 658
 659                 # To avoid closing the element or CDATA section
 660                 "<" => "\\x3c",
 661                 ">" => "\\x3e",
 662         );
 663         return strtr( $string, $pairs );
 664 }
 665
 666 /**
 667  * @todo document
 668  * @return float
 669  */
 670 function wfTime() {
 671         $st = explode( ' ', microtime() );
 672         return (float)$st[0] + (float)$st[1];
 673 }
 674
 675 /**
 676  * Changes the first character to an HTML entity
 677  */
 678 function wfHtmlEscapeFirst( $text ) {
 679         $ord = ord($text);
 680         $newText = substr($text, 1);
 681         return "&#$ord;$newText";
 682 }
 683
 684 /**
 685  * Sets dest to source and returns the original value of dest
 686  * If source is NULL, it just returns the value, it doesn't set the variable
 687  */
 688 function wfSetVar( &$dest, $source ) {
 689         $temp = $dest;
 690         if ( !is_null( $source ) ) {
 691                 $dest = $source;
 692         }
 693         return $temp;
 694 }
 695
 696 /**
 697  * As for wfSetVar except setting a bit
 698  */
 699 function wfSetBit( &$dest, $bit, $state = true ) {
 700         $temp = (bool)($dest & $bit );
 701         if ( !is_null( $state ) ) {
 702                 if ( $state ) {
 703                         $dest |= $bit;
 704                 } else {
 705                         $dest &= ~$bit;
 706                 }
 707         }
 708         return $temp;
 709 }
 710
 711 /**
 712  * This function takes two arrays as input, and returns a CGI-style string, e.g.
 713  * "days=7&limit=100". Options in the first array override options in the second.
 714  * Options set to "" will not be output.
 715  */
 716 function wfArrayToCGI( $array1, $array2 = NULL )
 717 {
 718         if ( !is_null( $array2 ) ) {
 719                 $array1 = $array1 + $array2;
 720         }
 721
 722         $cgi = '';
 723         foreach ( $array1 as $key => $value ) {
 724                 if ( '' !== $value ) {
 725                         if ( '' != $cgi ) {
 726                                 $cgi .= '&';
 727                         }
 728                         $cgi .= urlencode( $key ) . '=' . urlencode( $value );
 729                 }
 730         }
 731         return $cgi;
 732 }
 733
 734 /**
 735  * This is obsolete, use SquidUpdate::purge()
 736  * @deprecated
 737  */
 738 function wfPurgeSquidServers ($urlArr) {
 739         SquidUpdate::purge( $urlArr );
 740 }
 741
 742 /**
 743  * Windows-compatible version of escapeshellarg()
 744  * Windows doesn't recognise single-quotes in the shell, but the escapeshellarg()
 745  * function puts single quotes in regardless of OS
 746  */
 747 function wfEscapeShellArg( ) {
 748         $args = func_get_args();
 749         $first = true;
 750         $retVal = '';
 751         foreach ( $args as $arg ) {
 752                 if ( !$first ) {
 753                         $retVal .= ' ';
 754                 } else {
 755                         $first = false;
 756                 }
 757
 758                 if ( wfIsWindows() ) {
 759                         $retVal .= '"' . str_replace( '"','\"', $arg ) . '"';
 760                 } else {
 761                         $retVal .= escapeshellarg( $arg );
 762                 }
 763         }
 764         return $retVal;
 765 }
 766
 767 /**
 768  * wfMerge attempts to merge differences between three texts.
 769  * Returns true for a clean merge and false for failure or a conflict.
 770  */
 771 function wfMerge( $old, $mine, $yours, &$result ){
 772         global $wgDiff3;
 773
 774         # This check may also protect against code injection in
 775         # case of broken installations.
 776         if(! file_exists( $wgDiff3 ) ){
 777                 return false;
 778         }
 779
 780         # Make temporary files
 781         $td = wfTempDir();
 782         $oldtextFile = fopen( $oldtextName = tempnam( $td, 'merge-old-' ), 'w' );
 783         $mytextFile = fopen( $mytextName = tempnam( $td, 'merge-mine-' ), 'w' );
 784         $yourtextFile = fopen( $yourtextName = tempnam( $td, 'merge-your-' ), 'w' );
 785
 786         fwrite( $oldtextFile, $old ); fclose( $oldtextFile );
 787         fwrite( $mytextFile, $mine ); fclose( $mytextFile );
 788         fwrite( $yourtextFile, $yours ); fclose( $yourtextFile );
 789
 790         # Check for a conflict
 791         $cmd = wfEscapeShellArg( $wgDiff3 ) . ' -a --overlap-only ' .
 792           wfEscapeShellArg( $mytextName ) . ' ' .
 793           wfEscapeShellArg( $oldtextName ) . ' ' .
 794           wfEscapeShellArg( $yourtextName );
 795         $handle = popen( $cmd, 'r' );
 796
 797         if( fgets( $handle, 1024 ) ){
 798                 $conflict = true;
 799         } else {
 800                 $conflict = false;
 801         }
 802         pclose( $handle );
 803
 804         # Merge differences
 805         $cmd = wfEscapeShellArg( $wgDiff3 ) . ' -a -e --merge ' .
 806           wfEscapeShellArg( $mytextName, $oldtextName, $yourtextName );
 807         $handle = popen( $cmd, 'r' );
 808         $result = '';
 809         do {
 810                 $data = fread( $handle, 8192 );
 811                 if ( strlen( $data ) == 0 ) {
 812                         break;
 813                 }
 814                 $result .= $data;
 815         } while ( true );
 816         pclose( $handle );
 817         unlink( $mytextName ); unlink( $oldtextName ); unlink( $yourtextName );
 818         return ! $conflict;
 819 }
 820
 821 /**
 822  * @todo document
 823  */
 824 function wfVarDump( $var ) {
 825         global $wgOut;
 826         $s = str_replace("\n","<br />\n", var_export( $var, true ) . "\n");
 827         if ( headers_sent() || !@is_object( $wgOut ) ) {
 828                 print $s;
 829         } else {
 830                 $wgOut->addHTML( $s );
 831         }
 832 }
 833
 834 /**
 835  * Provide a simple HTTP error.
 836  */
 837 function wfHttpError( $code, $label, $desc ) {
 838         global $wgOut;
 839         $wgOut->disable();
 840         header( "HTTP/1.0 $code $label" );
 841         header( "Status: $code $label" );
 842         $wgOut->sendCacheControl();
 843
 844         header( 'Content-type: text/html' );
 845         print "<html><head><title>" .
 846                 htmlspecialchars( $label ) .
 847                 "</title></head><body><h1>" .
 848                 htmlspecialchars( $label ) .
 849                 "</h1><p>" .
 850                 htmlspecialchars( $desc ) .
 851                 "</p></body></html>\n";
 852 }
 853
 854 /**
 855  * Converts an Accept-* header into an array mapping string values to quality
 856  * factors
 857  */
 858 function wfAcceptToPrefs( $accept, $def = '*/*' ) {
 859         # No arg means accept anything (per HTTP spec)
 860         if( !$accept ) {
 861                 return array( $def => 1 );
 862         }
 863
 864         $prefs = array();
 865
 866         $parts = explode( ',', $accept );
 867
 868         foreach( $parts as $part ) {
 869                 # FIXME: doesn't deal with params like 'text/html; level=1'
 870                 @list( $value, $qpart ) = explode( ';', $part );
 871                 if( !isset( $qpart ) ) {
 872                         $prefs[$value] = 1;
 873                 } elseif( preg_match( '/q\s*=\s*(\d*\.\d+)/', $qpart, $match ) ) {
 874                         $prefs[$value] = $match[1];
 875                 }
 876         }
 877
 878         return $prefs;
 879 }
 880
 881 /**
 882  * Checks if a given MIME type matches any of the keys in the given
 883  * array. Basic wildcards are accepted in the array keys.
 884  *
 885  * Returns the matching MIME type (or wildcard) if a match, otherwise
 886  * NULL if no match.
 887  *
 888  * @param string $type
 889  * @param array $avail
 890  * @return string
 891  * @access private
 892  */
 893 function mimeTypeMatch( $type, $avail ) {
 894         if( array_key_exists($type, $avail) ) {
 895                 return $type;
 896         } else {
 897                 $parts = explode( '/', $type );
 898                 if( array_key_exists( $parts[0] . '/*', $avail ) ) {
 899                         return $parts[0] . '/*';
 900                 } elseif( array_key_exists( '*/*', $avail ) ) {
 901                         return '*/*';
 902                 } else {
 903                         return NULL;
 904                 }
 905         }
 906 }
 907
 908 /**
 909  * Returns the 'best' match between a client's requested internet media types
 910  * and the server's list of available types. Each list should be an associative
 911  * array of type to preference (preference is a float between 0.0 and 1.0).
 912  * Wildcards in the types are acceptable.
 913  *
 914  * @param array $cprefs Client's acceptable type list
 915  * @param array $sprefs Server's offered types
 916  * @return string
 917  *
 918  * @todo FIXME: doesn't handle params like 'text/plain; charset=UTF-8'
 919  * XXX: generalize to negotiate other stuff
 920  */
 921 function wfNegotiateType( $cprefs, $sprefs ) {
 922         $combine = array();
 923
 924         foreach( array_keys($sprefs) as $type ) {
 925                 $parts = explode( '/', $type );
 926                 if( $parts[1] != '*' ) {
 927                         $ckey = mimeTypeMatch( $type, $cprefs );
 928                         if( $ckey ) {
 929                                 $combine[$type] = $sprefs[$type] * $cprefs[$ckey];
 930                         }
 931                 }
 932         }
 933
 934         foreach( array_keys( $cprefs ) as $type ) {
 935                 $parts = explode( '/', $type );
 936                 if( $parts[1] != '*' && !array_key_exists( $type, $sprefs ) ) {
 937                         $skey = mimeTypeMatch( $type, $sprefs );
 938                         if( $skey ) {
 939                                 $combine[$type] = $sprefs[$skey] * $cprefs[$type];
 940                         }
 941                 }
 942         }
 943
 944         $bestq = 0;
 945         $besttype = NULL;
 946
 947         foreach( array_keys( $combine ) as $type ) {
 948                 if( $combine[$type] > $bestq ) {
 949                         $besttype = $type;
 950                         $bestq = $combine[$type];
 951                 }
 952         }
 953
 954         return $besttype;
 955 }
 956
 957 /**
 958  * Array lookup
 959  * Returns an array where the values in the first array are replaced by the
 960  * values in the second array with the corresponding keys
 961  *
 962  * @return array
 963  */
 964 function wfArrayLookup( $a, $b ) {
 965         return array_flip( array_intersect( array_flip( $a ), array_keys( $b ) ) );
 966 }
 967
 968 /**
 969  * Convenience function; returns MediaWiki timestamp for the present time.
 970  * @return string
 971  */
 972 function wfTimestampNow() {
 973         # return NOW
 974         return wfTimestamp( TS_MW, time() );
 975 }
 976
 977 /**
 978  * Reference-counted warning suppression
 979  */
 980 function wfSuppressWarnings( $end = false ) {
 981         static $suppressCount = 0;
 982         static $originalLevel = false;
 983
 984         if ( $end ) {
 985                 if ( $suppressCount ) {
 986                         $suppressCount --;
 987                         if ( !$suppressCount ) {
 988                                 error_reporting( $originalLevel );
 989                         }
 990                 }
 991         } else {
 992                 if ( !$suppressCount ) {
 993                         $originalLevel = error_reporting( E_ALL & ~( E_WARNING | E_NOTICE ) );
 994                 }
 995                 $suppressCount++;
 996         }
 997 }
 998
 999 /**
1000  * Restore error level to previous value
1001  */
1002 function wfRestoreWarnings() {
1003         wfSuppressWarnings( true );
1004 }
1005
1006 # Autodetect, convert and provide timestamps of various types
1007
1008 /**
1009  * Unix time - the number of seconds since 1970-01-01 00:00:00 UTC
1010  */
1011 define('TS_UNIX', 0);
1012
1013 /**
1014  * MediaWiki concatenated string timestamp (YYYYMMDDHHMMSS)
1015  */
1016 define('TS_MW', 1);
1017
1018 /**
1019  * MySQL DATETIME (YYYY-MM-DD HH:MM:SS)
1020  */
1021 define('TS_DB', 2);
1022
1023 /**
1024  * RFC 2822 format, for E-mail and HTTP headers
1025  */
1026 define('TS_RFC2822', 3);
1027
1028 /**
1029  * An Exif timestamp (YYYY:MM:DD HH:MM:SS)
1030  *
1031  * @link http://exif.org/Exif2-2.PDF The Exif 2.2 spec, see page 28 for the
1032  *       DateTime tag and page 36 for the DateTimeOriginal and
1033  *       DateTimeDigitized tags.
1034  */
1035 define('TS_EXIF', 4);
1036
1037 /**
1038  * Oracle format time.
1039  */
1040 define('TS_ORACLE', 5);
1041
1042 /**
1043  * @param mixed $outputtype A timestamp in one of the supported formats, the
1044  *                          function will autodetect which format is supplied
1045                             and act accordingly.
1046  * @return string Time in the format specified in $outputtype
1047  */
1048 function wfTimestamp($outputtype=TS_UNIX,$ts=0) {
1049 wfdebug("ts: $ts\n");
1050         if ($ts==0) {
1051                 $uts=time();
1052         } elseif (preg_match("/^(\d{4})\-(\d\d)\-(\d\d) (\d\d):(\d\d):(\d\d)$/",$ts,$da)) {
1053                 # TS_DB
1054                 $uts=gmmktime((int)$da[4],(int)$da[5],(int)$da[6],
1055                             (int)$da[2],(int)$da[3],(int)$da[1]);
1056         } elseif (preg_match("/^(\d{4}):(\d\d):(\d\d) (\d\d):(\d\d):(\d\d)$/",$ts,$da)) {
1057                 # TS_EXIF
1058                 $uts=gmmktime((int)$da[4],(int)$da[5],(int)$da[6],
1059                         (int)$da[2],(int)$da[3],(int)$da[1]);
1060         } elseif (preg_match("/^(\d{4})(\d\d)(\d\d)(\d\d)(\d\d)(\d\d)$/",$ts,$da)) {
1061                 # TS_MW
1062                 $uts=gmmktime((int)$da[4],(int)$da[5],(int)$da[6],
1063                             (int)$da[2],(int)$da[3],(int)$da[1]);
1064         } elseif (preg_match("/^(\d{1,13})$/",$ts,$datearray)) {
1065                 # TS_UNIX
1066                 $uts=$ts;
1067         } elseif (preg_match('/^(\d{1,2})-(...)-(\d\d(\d\d)?) (\d\d)\.(\d\d)\.(\d\d)/', $ts, $da)) {
1068                 # TS_ORACLE
1069                 $uts = strtotime(preg_replace('/(\d\d)\.(\d\d)\.(\d\d)(\.(\d+))?/', "$1:$2:$3",
1070                                 str_replace("+00:00", "UTC", $ts)));
1071         } else {
1072                 # Bogus value; fall back to the epoch...
1073                 wfDebug("wfTimestamp() fed bogus time value: $outputtype; $ts\n");
1074                 $uts = 0;
1075         }
1076
1077
1078         switch($outputtype) {
1079                 case TS_UNIX:
1080                         return $uts;
1081                 case TS_MW:
1082                         return gmdate( 'YmdHis', $uts );
1083                 case TS_DB:
1084                         return gmdate( 'Y-m-d H:i:s', $uts );
1085                 // This shouldn't ever be used, but is included for completeness
1086                 case TS_EXIF:
1087                         return gmdate(  'Y:m:d H:i:s', $uts );
1088                 case TS_RFC2822:
1089                         return gmdate( 'D, d M Y H:i:s', $uts ) . ' GMT';
1090                 case TS_ORACLE:
1091                         return gmdate( 'd-M-y h.i.s A', $uts) . ' +00:00';
1092                 default:
1093                         wfDebugDieBacktrace( 'wfTimestamp() called with illegal output type.');
1094         }
1095 }
1096
1097 /**
1098  * Return a formatted timestamp, or null if input is null.
1099  * For dealing with nullable timestamp columns in the database.
1100  * @param int $outputtype
1101  * @param string $ts
1102  * @return string
1103  */
1104 function wfTimestampOrNull( $outputtype = TS_UNIX, $ts = null ) {
1105         if( is_null( $ts ) ) {
1106                 return null;
1107         } else {
1108                 return wfTimestamp( $outputtype, $ts );
1109         }
1110 }
1111
1112 /**
1113  * Check where as the operating system is Windows
1114  *
1115  * @return bool True if it's windows, False otherwise.
1116  */
1117 function wfIsWindows() {
1118         if (substr(php_uname(), 0, 7) == 'Windows') {
1119                 return true;
1120         } else {
1121                 return false;
1122         }
1123 }
1124
1125 /**
1126  * Swap two variables
1127  */
1128 function swap( &$x, &$y ) {
1129         $z = $x;
1130         $x = $y;
1131         $y = $z;
1132 }
1133
1134 function wfGetSiteNotice() {
1135         global $wgSiteNotice, $wgTitle, $wgOut;
1136         $fname = 'wfGetSiteNotice';
1137         wfProfileIn( $fname );
1138
1139         $notice = wfMsg( 'sitenotice' );
1140         if( $notice == '&lt;sitenotice&gt;' || $notice == '-' ) {
1141                 $notice = '';
1142         }
1143         if( $notice == '' ) {
1144                 # We may also need to override a message with eg downtime info
1145                 # FIXME: make this work!
1146                 $notice = $wgSiteNotice;
1147         }
1148         if($notice != '-' && $notice != '') {
1149                 $specialparser = new Parser();
1150                 $parserOutput = $specialparser->parse( $notice, $wgTitle, $wgOut->mParserOptions, false );
1151                 $notice = $parserOutput->getText();
1152         }
1153         wfProfileOut( $fname );
1154         return $notice;
1155 }
1156
1157 /**
1158  * Format an XML element with given attributes and, optionally, text content.
1159  * Element and attribute names are assumed to be ready for literal inclusion.
1160  * Strings are assumed to not contain XML-illegal characters; special
1161  * characters (<, >, &) are escaped but illegals are not touched.
1162  *
1163  * @param string $element
1164  * @param array $attribs Name=>value pairs. Values will be escaped.
1165  * @param string $contents NULL to make an open tag only; '' for a contentless closed tag (default)
1166  * @return string
1167  */
1168 function wfElement( $element, $attribs = null, $contents = '') {
1169         $out = '<' . $element;
1170         if( !is_null( $attribs ) ) {
1171                 foreach( $attribs as $name => $val ) {
1172                         $out .= ' ' . $name . '="' . htmlspecialchars( $val ) . '"';
1173                 }
1174         }
1175         if( is_null( $contents ) ) {
1176                 $out .= '>';
1177         } else {
1178                 if( $contents == '' ) {
1179                         $out .= ' />';
1180                 } else {
1181                         $out .= '>';
1182                         $out .= htmlspecialchars( $contents );
1183                         $out .= "</$element>";
1184                 }
1185         }
1186         return $out;
1187 }
1188
1189 /**
1190  * Format an XML element as with wfElement(), but run text through the
1191  * UtfNormal::cleanUp() validator first to ensure that no invalid UTF-8
1192  * is passed.
1193  *
1194  * @param string $element
1195  * @param array $attribs Name=>value pairs. Values will be escaped.
1196  * @param string $contents NULL to make an open tag only; '' for a contentless closed tag (default)
1197  * @return string
1198  */
1199 function wfElementClean( $element, $attribs = array(), $contents = '') {
1200         if( $attribs ) {
1201                 $attribs = array_map( array( 'UtfNormal', 'cleanUp' ), $attribs );
1202         }
1203         if( $contents ) {
1204                 $contents = UtfNormal::cleanUp( $contents );
1205         }
1206         return wfElement( $element, $attribs, $contents );
1207 }
1208
1209 /**
1210  * Create a namespace selector
1211  *
1212  * @param mixed $selected The namespace which should be selected, default ''
1213  * @param string $allnamespaces Value of a special item denoting all namespaces. Null to not include (default)
1214  * @return Html string containing the namespace selector
1215  */
1216 function &HTMLnamespaceselector($selected = '', $allnamespaces = null) {
1217         global $wgContLang;
1218         $s = "<select name='namespace' class='namespaceselector'>\n";
1219         $arr = $wgContLang->getFormattedNamespaces();
1220         if( !is_null($allnamespaces) ) {
1221                 $arr = array($allnamespaces => wfMsgHtml('namespacesall')) + $arr;
1222         }
1223         foreach ($arr as $index => $name) {
1224                 if ($index < NS_MAIN) continue;
1225
1226                 $name = $index !== 0 ? $name : wfMsgHtml('blanknamespace');
1227
1228                 if ($index === $selected) {
1229                         $s .= wfElement("option",
1230                                         array("value" => $index, "selected" => "selected"),
1231                                         $name);
1232                 } else {
1233                         $s .= wfElement("option", array("value" => $index), $name);
1234                 }
1235         }
1236         $s .= "</select>\n";
1237         return $s;
1238 }
1239
1240 /** Global singleton instance of MimeMagic. This is initialized on demand,
1241 * please always use the wfGetMimeMagic() function to get the instance.
1242 *
1243 * @private
1244 */
1245 $wgMimeMagic= NULL;
1246
1247 /** Factory functions for the global MimeMagic object.
1248 * This function always returns the same singleton instance of MimeMagic.
1249 * That objects will be instantiated on the first call to this function.
1250 * If needed, the MimeMagic.php file is automatically included by this function.
1251 * @return MimeMagic the global MimeMagic objects.
1252 */
1253 function &wfGetMimeMagic() {
1254         global $wgMimeMagic;
1255
1256         if (!is_null($wgMimeMagic)) {
1257                 return $wgMimeMagic;
1258         }
1259
1260         if (!class_exists("MimeMagic")) {
1261                 #include on demand
1262                 require_once("MimeMagic.php");
1263         }
1264
1265         $wgMimeMagic= new MimeMagic();
1266
1267         return $wgMimeMagic;
1268 }
1269
1270
1271 /**
1272  * Tries to get the system directory for temporary files.
1273  * The TMPDIR, TMP, and TEMP environment variables are checked in sequence,
1274  * and if none are set /tmp is returned as the generic Unix default.
1275  *
1276  * NOTE: When possible, use the tempfile() function to create temporary
1277  * files to avoid race conditions on file creation, etc.
1278  *
1279  * @return string
1280  */
1281 function wfTempDir() {
1282         foreach( array( 'TMPDIR', 'TMP', 'TEMP' ) as $var ) {
1283                 $tmp = getenv( $var );
1284                 if( $tmp && file_exists( $tmp ) && is_dir( $tmp ) && is_writable( $tmp ) ) {
1285                         return $tmp;
1286                 }
1287         }
1288         # Hope this is Unix of some kind!
1289         return '/tmp';
1290 }
1291
1292 /**
1293  * Make directory, and make all parent directories if they don't exist
1294  */
1295 function wfMkdirParents( $fullDir, $mode ) {
1296         $parts = explode( '/', $fullDir );
1297         $path = '';
1298         $success = false;
1299         foreach ( $parts as $dir ) {
1300                 $path .= $dir . '/';
1301                 if ( !is_dir( $path ) ) {
1302                         if ( !mkdir( $path, $mode ) ) {
1303                                 return false;
1304                         }
1305                 }
1306         }
1307         return true;
1308 }
1309
1310 /**
1311  * Increment a statistics counter
1312  */
1313 function wfIncrStats( $key ) {
1314         global $wgDBname, $wgMemc;
1315         $key = "$wgDBname:stats:$key";
1316         if ( is_null( $wgMemc->incr( $key ) ) ) {
1317                 $wgMemc->add( $key, 1 );
1318         }
1319 }
1320
1321 /**
1322  * @param mixed $nr The number to format
1323  * @param int $acc The number of digits after the decimal point, default 2
1324  * @param bool $round Whether or not to round the value, default true
1325  * @return float
1326  */
1327 function wfPercent( $nr, $acc = 2, $round = true ) {
1328         $ret = sprintf( "%.${acc}f", $nr );
1329         return $round ? round( $ret, $acc ) . '%' : "$ret%";
1330 }
1331
1332 /**
1333  * Encrypt a username/password.
1334  *
1335  * @param string $userid ID of the user
1336  * @param string $password Password of the user
1337  * @return string Hashed password
1338  */
1339 function wfEncryptPassword( $userid, $password ) {
1340         global $wgPasswordSalt;
1341         $p = md5( $password);
1342
1343         if($wgPasswordSalt)
1344                 return md5( "{$userid}-{$p}" );
1345         else
1346                 return $p;
1347 }
1348
1349 /**
1350  * Appends to second array if $value differs from that in $default
1351  */
1352 function wfAppendToArrayIfNotDefault( $key, $value, $default, &$changed ) {
1353         if ( is_null( $changed ) ) {
1354                 wfDebugDieBacktrace('GlobalFunctions::wfAppendToArrayIfNotDefault got null');
1355         }
1356         if ( $default[$key] !== $value ) {
1357                 $changed[$key] = $value;
1358         }
1359 }
1360
1361 ?>