1<?php 2/** 3 * Changelog handling functions 4 * 5 * @license GPL 2 (http://www.gnu.org/licenses/gpl.html) 6 * @author Andreas Gohr <andi@splitbrain.org> 7 */ 8 9// Constants for known core changelog line types. 10// Use these in place of string literals for more readable code. 11define('DOKU_CHANGE_TYPE_CREATE', 'C'); 12define('DOKU_CHANGE_TYPE_EDIT', 'E'); 13define('DOKU_CHANGE_TYPE_MINOR_EDIT', 'e'); 14define('DOKU_CHANGE_TYPE_DELETE', 'D'); 15define('DOKU_CHANGE_TYPE_REVERT', 'R'); 16 17/** 18 * parses a changelog line into it's components 19 * 20 * @author Ben Coburn <btcoburn@silicodon.net> 21 */ 22function parseChangelogLine($line) { 23 $tmp = explode("\t", $line); 24 if ($tmp!==false && count($tmp)>1) { 25 $info = array(); 26 $info['date'] = (int)$tmp[0]; // unix timestamp 27 $info['ip'] = $tmp[1]; // IPv4 address (127.0.0.1) 28 $info['type'] = $tmp[2]; // log line type 29 $info['id'] = $tmp[3]; // page id 30 $info['user'] = $tmp[4]; // user name 31 $info['sum'] = $tmp[5]; // edit summary (or action reason) 32 $info['extra'] = rtrim($tmp[6], "\n"); // extra data (varies by line type) 33 return $info; 34 } else { return false; } 35} 36 37/** 38 * Add's an entry to the changelog and saves the metadata for the page 39 * 40 * @param int $date Timestamp of the change 41 * @param String $id Name of the affected page 42 * @param String $type Type of the change see DOKU_CHANGE_TYPE_* 43 * @param String $summary Summary of the change 44 * @param mixed $extra In case of a revert the revision (timestmp) of the reverted page 45 * @param array $flags Additional flags in a key value array. 46 * Availible flags: 47 * - ExternalEdit - mark as an external edit. 48 * 49 * @author Andreas Gohr <andi@splitbrain.org> 50 * @author Esther Brunner <wikidesign@gmail.com> 51 * @author Ben Coburn <btcoburn@silicodon.net> 52 */ 53function addLogEntry($date, $id, $type=DOKU_CHANGE_TYPE_EDIT, $summary='', $extra='', $flags=null){ 54 global $conf, $INFO; 55 56 // check for special flags as keys 57 if (!is_array($flags)) { $flags = array(); } 58 $flagExternalEdit = isset($flags['ExternalEdit']); 59 60 $id = cleanid($id); 61 $file = wikiFN($id); 62 $created = @filectime($file); 63 $minor = ($type===DOKU_CHANGE_TYPE_MINOR_EDIT); 64 $wasRemoved = ($type===DOKU_CHANGE_TYPE_DELETE); 65 66 if(!$date) $date = time(); //use current time if none supplied 67 $remote = (!$flagExternalEdit)?clientIP(true):'127.0.0.1'; 68 $user = (!$flagExternalEdit)?$_SERVER['REMOTE_USER']:''; 69 70 $strip = array("\t", "\n"); 71 $logline = array( 72 'date' => $date, 73 'ip' => $remote, 74 'type' => str_replace($strip, '', $type), 75 'id' => $id, 76 'user' => $user, 77 'sum' => utf8_substr(str_replace($strip, '', $summary),0,255), 78 'extra' => str_replace($strip, '', $extra) 79 ); 80 81 // update metadata 82 if (!$wasRemoved) { 83 $oldmeta = p_read_metadata($id); 84 $meta = array(); 85 if (!$INFO['exists'] && empty($oldmeta['persistent']['date']['created'])){ // newly created 86 $meta['date']['created'] = $created; 87 if ($user){ 88 $meta['creator'] = $INFO['userinfo']['name']; 89 $meta['user'] = $user; 90 } 91 } elseif (!$INFO['exists'] && !empty($oldmeta['persistent']['date']['created'])) { // re-created / restored 92 $meta['date']['created'] = $oldmeta['persistent']['date']['created']; 93 $meta['date']['modified'] = $created; // use the files ctime here 94 $meta['creator'] = $oldmeta['persistent']['creator']; 95 if ($user) $meta['contributor'][$user] = $INFO['userinfo']['name']; 96 } elseif (!$minor) { // non-minor modification 97 $meta['date']['modified'] = $date; 98 if ($user) $meta['contributor'][$user] = $INFO['userinfo']['name']; 99 } 100 $meta['last_change'] = $logline; 101 p_set_metadata($id, $meta); 102 } 103 104 // add changelog lines 105 $logline = implode("\t", $logline)."\n"; 106 io_saveFile(metaFN($id,'.changes'),$logline,true); //page changelog 107 io_saveFile($conf['changelog'],$logline,true); //global changelog cache 108} 109 110/** 111 * Add's an entry to the media changelog 112 * 113 * @author Michael Hamann <michael@content-space.de> 114 * @author Andreas Gohr <andi@splitbrain.org> 115 * @author Esther Brunner <wikidesign@gmail.com> 116 * @author Ben Coburn <btcoburn@silicodon.net> 117 */ 118function addMediaLogEntry($date, $id, $type=DOKU_CHANGE_TYPE_EDIT, $summary='', $extra='', $flags=null){ 119 global $conf; 120 121 $id = cleanid($id); 122 123 if(!$date) $date = time(); //use current time if none supplied 124 $remote = clientIP(true); 125 $user = $_SERVER['REMOTE_USER']; 126 127 $strip = array("\t", "\n"); 128 $logline = array( 129 'date' => $date, 130 'ip' => $remote, 131 'type' => str_replace($strip, '', $type), 132 'id' => $id, 133 'user' => $user, 134 'sum' => utf8_substr(str_replace($strip, '', $summary),0,255), 135 'extra' => str_replace($strip, '', $extra) 136 ); 137 138 // add changelog lines 139 $logline = implode("\t", $logline)."\n"; 140 io_saveFile($conf['media_changelog'],$logline,true); //global media changelog cache 141 io_saveFile(mediaMetaFN($id,'.changes'),$logline,true); //media file's changelog 142} 143 144/** 145 * returns an array of recently changed files using the 146 * changelog 147 * 148 * The following constants can be used to control which changes are 149 * included. Add them together as needed. 150 * 151 * RECENTS_SKIP_DELETED - don't include deleted pages 152 * RECENTS_SKIP_MINORS - don't include minor changes 153 * RECENTS_SKIP_SUBSPACES - don't include subspaces 154 * RECENTS_MEDIA_CHANGES - return media changes instead of page changes 155 * RECENTS_MEDIA_PAGES_MIXED - return both media changes and page changes 156 * 157 * @param int $first number of first entry returned (for paginating 158 * @param int $num return $num entries 159 * @param string $ns restrict to given namespace 160 * @param int $flags see above 161 * @return array recently changed files 162 * 163 * @author Ben Coburn <btcoburn@silicodon.net> 164 * @author Kate Arzamastseva <pshns@ukr.net> 165 */ 166function getRecents($first,$num,$ns='',$flags=0){ 167 global $conf; 168 $recent = array(); 169 $count = 0; 170 171 if(!$num) 172 return $recent; 173 174 // read all recent changes. (kept short) 175 if ($flags & RECENTS_MEDIA_CHANGES) { 176 $lines = @file($conf['media_changelog']); 177 } else { 178 $lines = @file($conf['changelog']); 179 } 180 $lines_position = count($lines)-1; 181 $media_lines_position = 0; 182 $media_lines = array(); 183 184 if ($flags & RECENTS_MEDIA_PAGES_MIXED) { 185 $media_lines = @file($conf['media_changelog']); 186 $media_lines_position = count($media_lines)-1; 187 } 188 189 $seen = array(); // caches seen lines, _handleRecent() skips them 190 191 // handle lines 192 while ($lines_position >= 0 || (($flags & RECENTS_MEDIA_PAGES_MIXED) && $media_lines_position >=0)) { 193 if (empty($rec) && $lines_position >= 0) { 194 $rec = _handleRecent(@$lines[$lines_position], $ns, $flags, $seen); 195 if (!$rec) { 196 $lines_position --; 197 continue; 198 } 199 } 200 if (($flags & RECENTS_MEDIA_PAGES_MIXED) && empty($media_rec) && $media_lines_position >= 0) { 201 $media_rec = _handleRecent(@$media_lines[$media_lines_position], $ns, $flags | RECENTS_MEDIA_CHANGES, $seen); 202 if (!$media_rec) { 203 $media_lines_position --; 204 continue; 205 } 206 } 207 if (($flags & RECENTS_MEDIA_PAGES_MIXED) && @$media_rec['date'] >= @$rec['date']) { 208 $media_lines_position--; 209 $x = $media_rec; 210 $x['media'] = true; 211 $media_rec = false; 212 } else { 213 $lines_position--; 214 $x = $rec; 215 if ($flags & RECENTS_MEDIA_CHANGES) $x['media'] = true; 216 $rec = false; 217 } 218 if(--$first >= 0) continue; // skip first entries 219 $recent[] = $x; 220 $count++; 221 // break when we have enough entries 222 if($count >= $num){ break; } 223 } 224 return $recent; 225} 226 227/** 228 * returns an array of files changed since a given time using the 229 * changelog 230 * 231 * The following constants can be used to control which changes are 232 * included. Add them together as needed. 233 * 234 * RECENTS_SKIP_DELETED - don't include deleted pages 235 * RECENTS_SKIP_MINORS - don't include minor changes 236 * RECENTS_SKIP_SUBSPACES - don't include subspaces 237 * RECENTS_MEDIA_CHANGES - return media changes instead of page changes 238 * 239 * @param int $from date of the oldest entry to return 240 * @param int $to date of the newest entry to return (for pagination, optional) 241 * @param string $ns restrict to given namespace (optional) 242 * @param int $flags see above (optional) 243 * @return array of files 244 * 245 * @author Michael Hamann <michael@content-space.de> 246 * @author Ben Coburn <btcoburn@silicodon.net> 247 */ 248function getRecentsSince($from,$to=null,$ns='',$flags=0){ 249 global $conf; 250 $recent = array(); 251 252 if($to && $to < $from) 253 return $recent; 254 255 // read all recent changes. (kept short) 256 if ($flags & RECENTS_MEDIA_CHANGES) { 257 $lines = @file($conf['media_changelog']); 258 } else { 259 $lines = @file($conf['changelog']); 260 } 261 if(!$lines) return $recent; 262 263 // we start searching at the end of the list 264 $lines = array_reverse($lines); 265 266 // handle lines 267 $seen = array(); // caches seen lines, _handleRecent() skips them 268 269 foreach($lines as $line){ 270 $rec = _handleRecent($line, $ns, $flags, $seen); 271 if($rec !== false) { 272 if ($rec['date'] >= $from) { 273 if (!$to || $rec['date'] <= $to) { 274 $recent[] = $rec; 275 } 276 } else { 277 break; 278 } 279 } 280 } 281 282 return array_reverse($recent); 283} 284 285/** 286 * Internal function used by getRecents 287 * 288 * don't call directly 289 * 290 * @see getRecents() 291 * @author Andreas Gohr <andi@splitbrain.org> 292 * @author Ben Coburn <btcoburn@silicodon.net> 293 */ 294function _handleRecent($line,$ns,$flags,&$seen){ 295 if(empty($line)) return false; //skip empty lines 296 297 // split the line into parts 298 $recent = parseChangelogLine($line); 299 if ($recent===false) { return false; } 300 301 // skip seen ones 302 if(isset($seen[$recent['id']])) return false; 303 304 // skip minors 305 if($recent['type']===DOKU_CHANGE_TYPE_MINOR_EDIT && ($flags & RECENTS_SKIP_MINORS)) return false; 306 307 // remember in seen to skip additional sights 308 $seen[$recent['id']] = 1; 309 310 // check if it's a hidden page 311 if(isHiddenPage($recent['id'])) return false; 312 313 // filter namespace 314 if (($ns) && (strpos($recent['id'],$ns.':') !== 0)) return false; 315 316 // exclude subnamespaces 317 if (($flags & RECENTS_SKIP_SUBSPACES) && (getNS($recent['id']) != $ns)) return false; 318 319 // check ACL 320 if ($flags & RECENTS_MEDIA_CHANGES) { 321 $recent['perms'] = auth_quickaclcheck(getNS($recent['id']).':*'); 322 } else { 323 $recent['perms'] = auth_quickaclcheck($recent['id']); 324 } 325 if ($recent['perms'] < AUTH_READ) return false; 326 327 // check existance 328 if($flags & RECENTS_SKIP_DELETED){ 329 $fn = (($flags & RECENTS_MEDIA_CHANGES) ? mediaFN($recent['id']) : wikiFN($recent['id'])); 330 if(!@file_exists($fn)) return false; 331 } 332 333 return $recent; 334} 335 336/** 337 * Class ChangeLog 338 * methods for handling of changelog of pages or media files 339 */ 340abstract class ChangeLog { 341 342 /** @var string */ 343 protected $id; 344 /** @var int */ 345 protected $chunk_size; 346 /** @var array */ 347 protected $cache; 348 349 /** 350 * Constructor 351 * 352 * @param string $id page id 353 * @param int $chunk_size maximum block size read from file 354 */ 355 public function __construct($id, $chunk_size = 8192) { 356 global $cache_revinfo; 357 358 $this->cache =& $cache_revinfo; 359 if(!isset($this->cache[$id])) { 360 $this->cache[$id] = array(); 361 } 362 363 $this->id = $id; 364 $this->setChunkSize($chunk_size); 365 366 } 367 368 /** 369 * Set chunk size for file reading 370 * Chunk size zero let read whole file at once 371 * 372 * @param int $chunk_size maximum block size read from file 373 */ 374 public function setChunkSize($chunk_size) { 375 if(!is_numeric($chunk_size)) $chunk_size = 0; 376 377 $this->chunk_size = (int) max($chunk_size, 0); 378 } 379 380 /** 381 * Returns path to changelog 382 * 383 * @return string path to file 384 */ 385 abstract protected function getChangelogFilename(); 386 387 /** 388 * Returns path to current page/media 389 * 390 * @return string path to file 391 */ 392 abstract protected function getFilename(); 393 394 /** 395 * Get the changelog information for a specific page id and revision (timestamp) 396 * 397 * Adjacent changelog lines are optimistically parsed and cached to speed up 398 * consecutive calls to getRevisionInfo. For large changelog files, only the chunk 399 * containing the requested changelog line is read. 400 * 401 * @param int $rev revision timestamp 402 * @return bool|array false or array with entries: 403 * - date: unix timestamp 404 * - ip: IPv4 address (127.0.0.1) 405 * - type: log line type 406 * - id: page id 407 * - user: user name 408 * - sum: edit summary (or action reason) 409 * - extra: extra data (varies by line type) 410 * 411 * @author Ben Coburn <btcoburn@silicodon.net> 412 * @author Kate Arzamastseva <pshns@ukr.net> 413 */ 414 public function getRevisionInfo($rev) { 415 $rev = max($rev, 0); 416 417 // check if it's already in the memory cache 418 if(isset($this->cache[$this->id]) && isset($this->cache[$this->id][$rev])) { 419 return $this->cache[$this->id][$rev]; 420 } 421 422 //read lines from changelog 423 list($fp, $lines) = $this->readloglines($rev); 424 if($fp) { 425 fclose($fp); 426 } 427 if(empty($lines)) return false; 428 429 // parse and cache changelog lines 430 foreach($lines as $value) { 431 $tmp = parseChangelogLine($value); 432 if($tmp !== false) { 433 $this->cache[$this->id][$tmp['date']] = $tmp; 434 } 435 } 436 if(!isset($this->cache[$this->id][$rev])) { 437 return false; 438 } 439 return $this->cache[$this->id][$rev]; 440 } 441 442 /** 443 * Return a list of page revisions numbers 444 * 445 * Does not guarantee that the revision exists in the attic, 446 * only that a line with the date exists in the changelog. 447 * By default the current revision is skipped. 448 * 449 * The current revision is automatically skipped when the page exists. 450 * See $INFO['meta']['last_change'] for the current revision. 451 * A negative $first let read the current revision too. 452 * 453 * For efficiency, the log lines are parsed and cached for later 454 * calls to getRevisionInfo. Large changelog files are read 455 * backwards in chunks until the requested number of changelog 456 * lines are recieved. 457 * 458 * @param int $first skip the first n changelog lines 459 * @param int $num number of revisions to return 460 * @return array with the revision timestamps 461 * 462 * @author Ben Coburn <btcoburn@silicodon.net> 463 * @author Kate Arzamastseva <pshns@ukr.net> 464 */ 465 public function getRevisions($first, $num) { 466 $revs = array(); 467 $lines = array(); 468 $count = 0; 469 470 $num = max($num, 0); 471 if ($num == 0) { return $revs; } 472 473 if ($first<0) { 474 $first = 0; 475 } else if (@file_exists($this->getFilename())) { 476 // skip current revision if the page exists 477 $first = max($first+1, 0); 478 } 479 480 $file = $this->getChangelogFilename(); 481 482 if (!@file_exists($file)) { return $revs; } 483 if (filesize($file)<$this->chunk_size || $this->chunk_size==0) { 484 // read whole file 485 $lines = file($file); 486 if ($lines===false) { return $revs; } 487 } else { 488 // read chunks backwards 489 $fp = fopen($file, 'rb'); // "file pointer" 490 if ($fp===false) { return $revs; } 491 fseek($fp, 0, SEEK_END); 492 $tail = ftell($fp); 493 494 // chunk backwards 495 $finger = max($tail-$this->chunk_size, 0); 496 while ($count<$num+$first) { 497 fseek($fp, $finger); 498 $nl = $finger; 499 if ($finger>0) { 500 fgets($fp); // slip the finger forward to a new line 501 $nl = ftell($fp); 502 } 503 504 // was the chunk big enough? if not, take another bite 505 if($nl > 0 && $tail <= $nl){ 506 $finger = max($finger-$this->chunk_size, 0); 507 continue; 508 }else{ 509 $finger = $nl; 510 } 511 512 // read chunk 513 $chunk = ''; 514 $read_size = max($tail-$finger, 0); // found chunk size 515 $got = 0; 516 while ($got<$read_size && !feof($fp)) { 517 $tmp = @fread($fp, max($read_size-$got, 0)); 518 if ($tmp===false) { break; } //error state 519 $got += strlen($tmp); 520 $chunk .= $tmp; 521 } 522 $tmp = explode("\n", $chunk); 523 array_pop($tmp); // remove trailing newline 524 525 // combine with previous chunk 526 $count += count($tmp); 527 $lines = array_merge($tmp, $lines); 528 529 // next chunk 530 if ($finger==0) { break; } // already read all the lines 531 else { 532 $tail = $finger; 533 $finger = max($tail-$this->chunk_size, 0); 534 } 535 } 536 fclose($fp); 537 } 538 539 // skip parsing extra lines 540 $num = max(min(count($lines)-$first, $num), 0); 541 if ($first>0 && $num>0) { $lines = array_slice($lines, max(count($lines)-$first-$num, 0), $num); } 542 else if ($first>0 && $num==0) { $lines = array_slice($lines, 0, max(count($lines)-$first, 0)); } 543 else if ($first==0 && $num>0) { $lines = array_slice($lines, max(count($lines)-$num, 0)); } 544 545 // handle lines in reverse order 546 for ($i = count($lines)-1; $i >= 0; $i--) { 547 $tmp = parseChangelogLine($lines[$i]); 548 if ($tmp!==false) { 549 $this->cache[$this->id][$tmp['date']] = $tmp; 550 $revs[] = $tmp['date']; 551 } 552 } 553 554 return $revs; 555 } 556 557 /** 558 * Get the nth revision left or right handside for a specific page id and revision (timestamp) 559 * 560 * For large changelog files, only the chunk containing the 561 * reference revision $rev is read and sometimes a next chunck. 562 * 563 * Adjacent changelog lines are optimistically parsed and cached to speed up 564 * consecutive calls to getRevisionInfo. 565 * 566 * @param int $rev revision timestamp used as startdate (doesn't need to be revisionnumber) 567 * @param int $direction give position of returned revision with respect to $rev; positive=next, negative=prev 568 * @return bool|int 569 * timestamp of the requested revision 570 * otherwise false 571 */ 572 public function getRelativeRevision($rev, $direction) { 573 $rev = max($rev, 0); 574 $direction = (int) $direction; 575 576 //no direction given or last rev, so no follow-up 577 if(!$direction || ($direction > 0 && $this->isCurrentRevision($rev)) ) { 578 return false; 579 } 580 581 //get lines from changelog 582 list($fp, $lines, $head, $tail, $eof) = $this->readloglines($rev); 583 if(empty($lines)) return false; 584 585 // look for revisions later/earlier then $rev, when founded count till the wanted revision is reached 586 // also parse and cache changelog lines for getRevisionInfo(). 587 $revcounter = 0; 588 $relativerev = false; 589 $checkotherchunck = true; //always runs once 590 while(!$relativerev && $checkotherchunck) { 591 $tmp = array(); 592 //parse in normal or reverse order 593 $count = count($lines); 594 if($direction > 0) { 595 $start = 0; 596 $step = 1; 597 } else { 598 $start = $count - 1; 599 $step = -1; 600 } 601 for($i = $start; $i >= 0 && $i < $count; $i = $i + $step) { 602 $tmp = parseChangelogLine($lines[$i]); 603 if($tmp !== false) { 604 $this->cache[$this->id][$tmp['date']] = $tmp; 605 //look for revs older/earlier then reference $rev and select $direction-th one 606 if(($direction > 0 && $tmp['date'] > $rev) || ($direction < 0 && $tmp['date'] < $rev)) { 607 $revcounter++; 608 if($revcounter == abs($direction)) { 609 $relativerev = $tmp['date']; 610 } 611 } 612 } 613 } 614 615 //true when $rev is found, but not the wanted follow-up. 616 $checkotherchunck = $fp 617 && ($tmp['date'] == $rev || ($revcounter > 0 && !$relativerev)) 618 && !(($tail == $eof && $direction > 0) || ($head == 0 && $direction < 0)); 619 620 if($checkotherchunck) { 621 //search bounds of chunck, rounded on new line, but smaller than $chunck_size 622 if($direction > 0) { 623 $head = $tail; 624 $lookpointer = true; 625 $tail = $head + floor($this->chunk_size * (2 / 3)); 626 while($lookpointer) { 627 $tail = min($tail, $eof); 628 $tail = $this->getNewlinepointer($fp, $tail); 629 $lookpointer = $tail - $head > $this->chunk_size; 630 if($lookpointer) { 631 $tail = $head + floor(($tail - $head) / 2); 632 } 633 if($tail == $head) break; 634 } 635 } else { 636 $tail = $head; 637 $head = max($tail - $this->chunk_size, 0); 638 $head = $this->getNewlinepointer($fp, $head); 639 } 640 641 //load next chunck 642 $lines = $this->readChunk($fp, $head, $tail); 643 if(empty($lines)) break; 644 } 645 } 646 if($fp) { 647 fclose($fp); 648 } 649 650 return $relativerev; 651 } 652 653 654 /** 655 * Returns lines from changelog. 656 * If file larger than $chuncksize, only chunck is read that could contain $rev. 657 * 658 * @param int $rev revision timestamp 659 * @return array(fp, array(changeloglines), $head, $tail, $eof)|bool 660 * returns false when not succeed. fp only defined for chuck reading, needs closing. 661 */ 662 protected function readloglines($rev) { 663 $file = $this->getChangelogFilename(); 664 665 if(!@file_exists($file)) { 666 return false; 667 } 668 669 $fp = null; 670 $head = 0; 671 $tail = 0; 672 $eof = 0; 673 674 if(filesize($file) < $this->chunk_size || $this->chunk_size == 0) { 675 // read whole file 676 $lines = file($file); 677 if($lines === false) { 678 return false; 679 } 680 } else { 681 // read by chunk 682 $fp = fopen($file, 'rb'); // "file pointer" 683 if($fp === false) { 684 return false; 685 } 686 $head = 0; 687 fseek($fp, 0, SEEK_END); 688 $eof = ftell($fp); 689 $tail = $eof; 690 691 // find chunk 692 while($tail - $head > $this->chunk_size) { 693 $finger = $head + floor(($tail - $head) / 2.0); 694 $finger = $this->getNewlinepointer($fp, $finger); 695 $tmp = fgets($fp); 696 $tmp = parseChangelogLine($tmp); 697 $finger_rev = $tmp['date']; 698 if($finger == $head || $finger == $tail) { 699 break; 700 } 701 if($finger_rev > $rev) { 702 $tail = $finger; 703 } else { 704 $head = $finger; 705 } 706 } 707 708 if($tail - $head < 1) { 709 // cound not find chunk, assume requested rev is missing 710 fclose($fp); 711 return false; 712 } 713 714 $lines = $this->readChunk($fp, $head, $tail); 715 } 716 return array( 717 $fp, 718 $lines, 719 $head, 720 $tail, 721 $eof 722 ); 723 } 724 725 /** 726 * Read chunk and return array with lines of given chunck. 727 * Has no check if $head and $tail are really at a new line 728 * 729 * @param $fp resource filepointer 730 * @param $head int start point chunck 731 * @param $tail int end point chunck 732 * @return array lines read from chunck 733 */ 734 protected function readChunk($fp, $head, $tail) { 735 $chunk = ''; 736 $chunk_size = max($tail - $head, 0); // found chunk size 737 $got = 0; 738 fseek($fp, $head); 739 while($got < $chunk_size && !feof($fp)) { 740 $tmp = @fread($fp, max($chunk_size - $got, 0)); 741 if($tmp === false) { //error state 742 break; 743 } 744 $got += strlen($tmp); 745 $chunk .= $tmp; 746 } 747 $lines = explode("\n", $chunk); 748 array_pop($lines); // remove trailing newline 749 return $lines; 750 } 751 752 /** 753 * Set pointer to first new line after $finger and return its position 754 * 755 * @param $fp resource filepointer 756 * @param $finger int a pointer 757 * @return int pointer 758 */ 759 protected function getNewlinepointer($fp, $finger) { 760 fseek($fp, $finger); 761 fgets($fp); // slip the finger forward to a new line 762 return ftell($fp); 763 } 764 765 /** 766 * Check whether given revision is the current page 767 * 768 * @param int $rev timestamp of current page 769 * @return bool true if $rev is current revision, otherwise false 770 */ 771 public function isCurrentRevision($rev) { 772 return $rev == @filemtime($this->getFilename()); 773 } 774 775 /** 776 * Return an existing revision for a specific date which is 777 * the current one or younger or equal then the date 778 * 779 * @param string $id 780 * @param number $date_at timestamp 781 * @return string revision ('' for current) 782 */ 783 function getLastRevisionAt($date_at){ 784 //requested date_at(timestamp) younger or equal then modified_time($this->id) => load current 785 if($date_at >= @filemtime($this->getFilename())) { 786 return ''; 787 } else if ($rev = $this->getRelativeRevision($date_at+1, -1)) { //+1 to get also the requested date revision 788 return $rev; 789 } else { 790 return false; 791 } 792 } 793} 794 795class PageChangelog extends ChangeLog { 796 797 /** 798 * Returns path to changelog 799 * 800 * @return string path to file 801 */ 802 protected function getChangelogFilename() { 803 return metaFN($this->id, '.changes'); 804 } 805 806 /** 807 * Returns path to current page/media 808 * 809 * @return string path to file 810 */ 811 protected function getFilename() { 812 return wikiFN($this->id); 813 } 814} 815 816class MediaChangelog extends ChangeLog { 817 818 /** 819 * Returns path to changelog 820 * 821 * @return string path to file 822 */ 823 protected function getChangelogFilename() { 824 return mediaMetaFN($this->id, '.changes'); 825 } 826 827 /** 828 * Returns path to current page/media 829 * 830 * @return string path to file 831 */ 832 protected function getFilename() { 833 return mediaFN($this->id); 834 } 835} 836 837 838/** 839 * Get the changelog information for a specific page id 840 * and revision (timestamp). Adjacent changelog lines 841 * are optimistically parsed and cached to speed up 842 * consecutive calls to getRevisionInfo. For large 843 * changelog files, only the chunk containing the 844 * requested changelog line is read. 845 * 846 * @deprecated 20-11-2013 847 * 848 * @author Ben Coburn <btcoburn@silicodon.net> 849 * @author Kate Arzamastseva <pshns@ukr.net> 850 */ 851function getRevisionInfo($id, $rev, $chunk_size=8192, $media=false) { 852 if($media) { 853 $changelog = new MediaChangeLog($id, $chunk_size); 854 } else { 855 $changelog = new PageChangeLog($id, $chunk_size); 856 } 857 return $changelog->getRevisionInfo($rev); 858} 859 860/** 861 * Return a list of page revisions numbers 862 * Does not guarantee that the revision exists in the attic, 863 * only that a line with the date exists in the changelog. 864 * By default the current revision is skipped. 865 * 866 * id: the page of interest 867 * first: skip the first n changelog lines 868 * num: number of revisions to return 869 * 870 * The current revision is automatically skipped when the page exists. 871 * See $INFO['meta']['last_change'] for the current revision. 872 * 873 * For efficiency, the log lines are parsed and cached for later 874 * calls to getRevisionInfo. Large changelog files are read 875 * backwards in chunks until the requested number of changelog 876 * lines are recieved. 877 * 878 * @deprecated 20-11-2013 879 * 880 * @author Ben Coburn <btcoburn@silicodon.net> 881 * @author Kate Arzamastseva <pshns@ukr.net> 882 */ 883function getRevisions($id, $first, $num, $chunk_size=8192, $media=false) { 884 if($media) { 885 $changelog = new MediaChangeLog($id, $chunk_size); 886 } else { 887 $changelog = new PageChangeLog($id, $chunk_size); 888 } 889 return $changelog->getRevisions($first, $num); 890} 891 892