1099 lines
37 KiB
PHP
1099 lines
37 KiB
PHP
<?php
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/**
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* Changelog handling functions
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*
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* @license GPL 2 (http://www.gnu.org/licenses/gpl.html)
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* @author Andreas Gohr <andi@splitbrain.org>
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*/
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// Constants for known core changelog line types.
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// Use these in place of string literals for more readable code.
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define('DOKU_CHANGE_TYPE_CREATE', 'C');
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define('DOKU_CHANGE_TYPE_EDIT', 'E');
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define('DOKU_CHANGE_TYPE_MINOR_EDIT', 'e');
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define('DOKU_CHANGE_TYPE_DELETE', 'D');
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define('DOKU_CHANGE_TYPE_REVERT', 'R');
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/**
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* parses a changelog line into it's components
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*
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* @author Ben Coburn <btcoburn@silicodon.net>
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*
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* @param string $line changelog line
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* @return array|bool parsed line or false
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*/
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function parseChangelogLine($line) {
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$tmp = explode("\t", $line);
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if ($tmp!==false && count($tmp)>1) {
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$info = array();
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$info['date'] = (int)$tmp[0]; // unix timestamp
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$info['ip'] = $tmp[1]; // IPv4 address (127.0.0.1)
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$info['type'] = $tmp[2]; // log line type
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$info['id'] = $tmp[3]; // page id
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$info['user'] = $tmp[4]; // user name
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$info['sum'] = $tmp[5]; // edit summary (or action reason)
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$info['extra'] = rtrim($tmp[6], "\n"); // extra data (varies by line type)
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return $info;
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} else { return false; }
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}
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/**
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* Add's an entry to the changelog and saves the metadata for the page
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*
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* @param int $date Timestamp of the change
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* @param String $id Name of the affected page
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* @param String $type Type of the change see DOKU_CHANGE_TYPE_*
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* @param String $summary Summary of the change
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* @param mixed $extra In case of a revert the revision (timestmp) of the reverted page
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* @param array $flags Additional flags in a key value array.
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* Available flags:
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* - ExternalEdit - mark as an external edit.
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*
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* @author Andreas Gohr <andi@splitbrain.org>
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* @author Esther Brunner <wikidesign@gmail.com>
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* @author Ben Coburn <btcoburn@silicodon.net>
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*/
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function addLogEntry($date, $id, $type=DOKU_CHANGE_TYPE_EDIT, $summary='', $extra='', $flags=null){
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global $conf, $INFO;
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/** @var Input $INPUT */
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global $INPUT;
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// check for special flags as keys
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if (!is_array($flags)) { $flags = array(); }
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$flagExternalEdit = isset($flags['ExternalEdit']);
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$id = cleanid($id);
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$file = wikiFN($id);
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$created = @filectime($file);
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$minor = ($type===DOKU_CHANGE_TYPE_MINOR_EDIT);
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$wasRemoved = ($type===DOKU_CHANGE_TYPE_DELETE);
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if(!$date) $date = time(); //use current time if none supplied
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$remote = (!$flagExternalEdit)?clientIP(true):'127.0.0.1';
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$user = (!$flagExternalEdit)?$INPUT->server->str('REMOTE_USER'):'';
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$strip = array("\t", "\n");
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$logline = array(
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'date' => $date,
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'ip' => $remote,
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'type' => str_replace($strip, '', $type),
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'id' => $id,
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'user' => $user,
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'sum' => utf8_substr(str_replace($strip, '', $summary),0,255),
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'extra' => str_replace($strip, '', $extra)
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);
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$wasCreated = ($type===DOKU_CHANGE_TYPE_CREATE);
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$wasReverted = ($type===DOKU_CHANGE_TYPE_REVERT);
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// update metadata
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if (!$wasRemoved) {
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$oldmeta = p_read_metadata($id);
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$meta = array();
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if ($wasCreated && empty($oldmeta['persistent']['date']['created'])){ // newly created
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$meta['date']['created'] = $created;
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if ($user){
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$meta['creator'] = $INFO['userinfo']['name'];
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$meta['user'] = $user;
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}
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} elseif (($wasCreated || $wasReverted) && !empty($oldmeta['persistent']['date']['created'])) { // re-created / restored
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$meta['date']['created'] = $oldmeta['persistent']['date']['created'];
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$meta['date']['modified'] = $created; // use the files ctime here
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$meta['creator'] = $oldmeta['persistent']['creator'];
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if ($user) $meta['contributor'][$user] = $INFO['userinfo']['name'];
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} elseif (!$minor) { // non-minor modification
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$meta['date']['modified'] = $date;
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if ($user) $meta['contributor'][$user] = $INFO['userinfo']['name'];
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}
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$meta['last_change'] = $logline;
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p_set_metadata($id, $meta);
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}
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// add changelog lines
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$logline = implode("\t", $logline)."\n";
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io_saveFile(metaFN($id,'.changes'),$logline,true); //page changelog
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io_saveFile($conf['changelog'],$logline,true); //global changelog cache
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}
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/**
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* Add's an entry to the media changelog
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*
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* @author Michael Hamann <michael@content-space.de>
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* @author Andreas Gohr <andi@splitbrain.org>
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* @author Esther Brunner <wikidesign@gmail.com>
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* @author Ben Coburn <btcoburn@silicodon.net>
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*
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* @param int $date Timestamp of the change
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* @param String $id Name of the affected page
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* @param String $type Type of the change see DOKU_CHANGE_TYPE_*
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* @param String $summary Summary of the change
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* @param mixed $extra In case of a revert the revision (timestmp) of the reverted page
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* @param array $flags Additional flags in a key value array.
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* Available flags:
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* - (none, so far)
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*/
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function addMediaLogEntry($date, $id, $type=DOKU_CHANGE_TYPE_EDIT, $summary='', $extra='', $flags=null){
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global $conf;
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/** @var Input $INPUT */
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global $INPUT;
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$id = cleanid($id);
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if(!$date) $date = time(); //use current time if none supplied
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$remote = clientIP(true);
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$user = $INPUT->server->str('REMOTE_USER');
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$strip = array("\t", "\n");
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$logline = array(
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'date' => $date,
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'ip' => $remote,
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'type' => str_replace($strip, '', $type),
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'id' => $id,
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'user' => $user,
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'sum' => utf8_substr(str_replace($strip, '', $summary),0,255),
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'extra' => str_replace($strip, '', $extra)
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);
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// add changelog lines
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$logline = implode("\t", $logline)."\n";
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io_saveFile($conf['media_changelog'],$logline,true); //global media changelog cache
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io_saveFile(mediaMetaFN($id,'.changes'),$logline,true); //media file's changelog
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}
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/**
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* returns an array of recently changed files using the
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* changelog
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*
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* The following constants can be used to control which changes are
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* included. Add them together as needed.
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*
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* RECENTS_SKIP_DELETED - don't include deleted pages
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* RECENTS_SKIP_MINORS - don't include minor changes
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* RECENTS_SKIP_SUBSPACES - don't include subspaces
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* RECENTS_MEDIA_CHANGES - return media changes instead of page changes
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* RECENTS_MEDIA_PAGES_MIXED - return both media changes and page changes
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*
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* @param int $first number of first entry returned (for paginating
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* @param int $num return $num entries
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* @param string $ns restrict to given namespace
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* @param int $flags see above
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* @return array recently changed files
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*
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* @author Ben Coburn <btcoburn@silicodon.net>
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* @author Kate Arzamastseva <pshns@ukr.net>
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*/
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function getRecents($first,$num,$ns='',$flags=0){
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global $conf;
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$recent = array();
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$count = 0;
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if(!$num)
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return $recent;
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// read all recent changes. (kept short)
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if ($flags & RECENTS_MEDIA_CHANGES) {
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$lines = @file($conf['media_changelog']);
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} else {
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$lines = @file($conf['changelog']);
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}
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$lines_position = count($lines)-1;
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$media_lines_position = 0;
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$media_lines = array();
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if ($flags & RECENTS_MEDIA_PAGES_MIXED) {
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$media_lines = @file($conf['media_changelog']);
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$media_lines_position = count($media_lines)-1;
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}
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$seen = array(); // caches seen lines, _handleRecent() skips them
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// handle lines
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while ($lines_position >= 0 || (($flags & RECENTS_MEDIA_PAGES_MIXED) && $media_lines_position >=0)) {
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if (empty($rec) && $lines_position >= 0) {
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$rec = _handleRecent(@$lines[$lines_position], $ns, $flags, $seen);
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if (!$rec) {
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$lines_position --;
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continue;
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}
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}
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if (($flags & RECENTS_MEDIA_PAGES_MIXED) && empty($media_rec) && $media_lines_position >= 0) {
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$media_rec = _handleRecent(@$media_lines[$media_lines_position], $ns, $flags | RECENTS_MEDIA_CHANGES, $seen);
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if (!$media_rec) {
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$media_lines_position --;
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continue;
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}
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}
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if (($flags & RECENTS_MEDIA_PAGES_MIXED) && @$media_rec['date'] >= @$rec['date']) {
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$media_lines_position--;
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$x = $media_rec;
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$x['media'] = true;
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$media_rec = false;
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} else {
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$lines_position--;
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$x = $rec;
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if ($flags & RECENTS_MEDIA_CHANGES) $x['media'] = true;
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$rec = false;
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}
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if(--$first >= 0) continue; // skip first entries
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$recent[] = $x;
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$count++;
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// break when we have enough entries
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if($count >= $num){ break; }
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}
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return $recent;
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}
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/**
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* returns an array of files changed since a given time using the
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* changelog
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*
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* The following constants can be used to control which changes are
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* included. Add them together as needed.
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*
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* RECENTS_SKIP_DELETED - don't include deleted pages
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* RECENTS_SKIP_MINORS - don't include minor changes
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* RECENTS_SKIP_SUBSPACES - don't include subspaces
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* RECENTS_MEDIA_CHANGES - return media changes instead of page changes
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*
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* @param int $from date of the oldest entry to return
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* @param int $to date of the newest entry to return (for pagination, optional)
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* @param string $ns restrict to given namespace (optional)
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* @param int $flags see above (optional)
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* @return array of files
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*
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* @author Michael Hamann <michael@content-space.de>
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* @author Ben Coburn <btcoburn@silicodon.net>
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*/
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function getRecentsSince($from,$to=null,$ns='',$flags=0){
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global $conf;
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$recent = array();
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if($to && $to < $from)
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return $recent;
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// read all recent changes. (kept short)
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if ($flags & RECENTS_MEDIA_CHANGES) {
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$lines = @file($conf['media_changelog']);
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} else {
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$lines = @file($conf['changelog']);
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}
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if(!$lines) return $recent;
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// we start searching at the end of the list
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$lines = array_reverse($lines);
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// handle lines
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$seen = array(); // caches seen lines, _handleRecent() skips them
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foreach($lines as $line){
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$rec = _handleRecent($line, $ns, $flags, $seen);
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if($rec !== false) {
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if ($rec['date'] >= $from) {
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if (!$to || $rec['date'] <= $to) {
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$recent[] = $rec;
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}
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} else {
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break;
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}
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}
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}
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return array_reverse($recent);
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}
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/**
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* Internal function used by getRecents
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*
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* don't call directly
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*
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* @see getRecents()
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* @author Andreas Gohr <andi@splitbrain.org>
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* @author Ben Coburn <btcoburn@silicodon.net>
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*
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* @param string $line changelog line
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* @param string $ns restrict to given namespace
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* @param int $flags flags to control which changes are included
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* @param array $seen listing of seen pages
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* @return array|bool false or array with info about a change
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*/
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function _handleRecent($line,$ns,$flags,&$seen){
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if(empty($line)) return false; //skip empty lines
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// split the line into parts
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$recent = parseChangelogLine($line);
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if ($recent===false) { return false; }
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// skip seen ones
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if(isset($seen[$recent['id']])) return false;
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// skip minors
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if($recent['type']===DOKU_CHANGE_TYPE_MINOR_EDIT && ($flags & RECENTS_SKIP_MINORS)) return false;
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// remember in seen to skip additional sights
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$seen[$recent['id']] = 1;
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// check if it's a hidden page
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if(isHiddenPage($recent['id'])) return false;
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// filter namespace
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if (($ns) && (strpos($recent['id'],$ns.':') !== 0)) return false;
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// exclude subnamespaces
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if (($flags & RECENTS_SKIP_SUBSPACES) && (getNS($recent['id']) != $ns)) return false;
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// check ACL
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if ($flags & RECENTS_MEDIA_CHANGES) {
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$recent['perms'] = auth_quickaclcheck(getNS($recent['id']).':*');
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} else {
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$recent['perms'] = auth_quickaclcheck($recent['id']);
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}
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if ($recent['perms'] < AUTH_READ) return false;
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// check existance
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if($flags & RECENTS_SKIP_DELETED){
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$fn = (($flags & RECENTS_MEDIA_CHANGES) ? mediaFN($recent['id']) : wikiFN($recent['id']));
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if(!file_exists($fn)) return false;
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}
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return $recent;
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}
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/**
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* Class ChangeLog
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* methods for handling of changelog of pages or media files
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*/
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abstract class ChangeLog {
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/** @var string */
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protected $id;
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/** @var int */
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protected $chunk_size;
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/** @var array */
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protected $cache;
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/**
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* Constructor
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*
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* @param string $id page id
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* @param int $chunk_size maximum block size read from file
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*/
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public function __construct($id, $chunk_size = 8192) {
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global $cache_revinfo;
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$this->cache =& $cache_revinfo;
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if(!isset($this->cache[$id])) {
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$this->cache[$id] = array();
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}
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$this->id = $id;
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$this->setChunkSize($chunk_size);
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}
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/**
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* Set chunk size for file reading
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* Chunk size zero let read whole file at once
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*
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* @param int $chunk_size maximum block size read from file
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*/
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public function setChunkSize($chunk_size) {
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if(!is_numeric($chunk_size)) $chunk_size = 0;
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$this->chunk_size = (int) max($chunk_size, 0);
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}
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/**
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* Returns path to changelog
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*
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* @return string path to file
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*/
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abstract protected function getChangelogFilename();
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/**
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* Returns path to current page/media
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*
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* @return string path to file
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*/
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abstract protected function getFilename();
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/**
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* Get the changelog information for a specific page id and revision (timestamp)
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*
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* Adjacent changelog lines are optimistically parsed and cached to speed up
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* consecutive calls to getRevisionInfo. For large changelog files, only the chunk
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* containing the requested changelog line is read.
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*
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* @param int $rev revision timestamp
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* @return bool|array false or array with entries:
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* - date: unix timestamp
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* - ip: IPv4 address (127.0.0.1)
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* - type: log line type
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* - id: page id
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* - user: user name
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* - sum: edit summary (or action reason)
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* - extra: extra data (varies by line type)
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*
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* @author Ben Coburn <btcoburn@silicodon.net>
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* @author Kate Arzamastseva <pshns@ukr.net>
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*/
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public function getRevisionInfo($rev) {
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$rev = max($rev, 0);
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// check if it's already in the memory cache
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if(isset($this->cache[$this->id]) && isset($this->cache[$this->id][$rev])) {
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return $this->cache[$this->id][$rev];
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}
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//read lines from changelog
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list($fp, $lines) = $this->readloglines($rev);
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if($fp) {
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fclose($fp);
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}
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if(empty($lines)) return false;
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// parse and cache changelog lines
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foreach($lines as $value) {
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$tmp = parseChangelogLine($value);
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if($tmp !== false) {
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$this->cache[$this->id][$tmp['date']] = $tmp;
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}
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}
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if(!isset($this->cache[$this->id][$rev])) {
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return false;
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}
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return $this->cache[$this->id][$rev];
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}
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/**
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* Return a list of page revisions numbers
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*
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* Does not guarantee that the revision exists in the attic,
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* only that a line with the date exists in the changelog.
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* By default the current revision is skipped.
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*
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* The current revision is automatically skipped when the page exists.
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* See $INFO['meta']['last_change'] for the current revision.
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* A negative $first let read the current revision too.
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*
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* For efficiency, the log lines are parsed and cached for later
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* calls to getRevisionInfo. Large changelog files are read
|
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* backwards in chunks until the requested number of changelog
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* lines are recieved.
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*
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* @param int $first skip the first n changelog lines
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* @param int $num number of revisions to return
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* @return array with the revision timestamps
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*
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* @author Ben Coburn <btcoburn@silicodon.net>
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* @author Kate Arzamastseva <pshns@ukr.net>
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*/
|
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public function getRevisions($first, $num) {
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$revs = array();
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$lines = array();
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$count = 0;
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$num = max($num, 0);
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if($num == 0) {
|
|
return $revs;
|
|
}
|
|
|
|
if($first < 0) {
|
|
$first = 0;
|
|
} else if(file_exists($this->getFilename())) {
|
|
// skip current revision if the page exists
|
|
$first = max($first + 1, 0);
|
|
}
|
|
|
|
$file = $this->getChangelogFilename();
|
|
|
|
if(!file_exists($file)) {
|
|
return $revs;
|
|
}
|
|
if(filesize($file) < $this->chunk_size || $this->chunk_size == 0) {
|
|
// read whole file
|
|
$lines = file($file);
|
|
if($lines === false) {
|
|
return $revs;
|
|
}
|
|
} else {
|
|
// read chunks backwards
|
|
$fp = fopen($file, 'rb'); // "file pointer"
|
|
if($fp === false) {
|
|
return $revs;
|
|
}
|
|
fseek($fp, 0, SEEK_END);
|
|
$tail = ftell($fp);
|
|
|
|
// chunk backwards
|
|
$finger = max($tail - $this->chunk_size, 0);
|
|
while($count < $num + $first) {
|
|
$nl = $this->getNewlinepointer($fp, $finger);
|
|
|
|
// was the chunk big enough? if not, take another bite
|
|
if($nl > 0 && $tail <= $nl) {
|
|
$finger = max($finger - $this->chunk_size, 0);
|
|
continue;
|
|
} else {
|
|
$finger = $nl;
|
|
}
|
|
|
|
// read chunk
|
|
$chunk = '';
|
|
$read_size = max($tail - $finger, 0); // found chunk size
|
|
$got = 0;
|
|
while($got < $read_size && !feof($fp)) {
|
|
$tmp = @fread($fp, max(min($this->chunk_size, $read_size - $got), 0));
|
|
if($tmp === false) {
|
|
break;
|
|
} //error state
|
|
$got += strlen($tmp);
|
|
$chunk .= $tmp;
|
|
}
|
|
$tmp = explode("\n", $chunk);
|
|
array_pop($tmp); // remove trailing newline
|
|
|
|
// combine with previous chunk
|
|
$count += count($tmp);
|
|
$lines = array_merge($tmp, $lines);
|
|
|
|
// next chunk
|
|
if($finger == 0) {
|
|
break;
|
|
} // already read all the lines
|
|
else {
|
|
$tail = $finger;
|
|
$finger = max($tail - $this->chunk_size, 0);
|
|
}
|
|
}
|
|
fclose($fp);
|
|
}
|
|
|
|
// skip parsing extra lines
|
|
$num = max(min(count($lines) - $first, $num), 0);
|
|
if ($first > 0 && $num > 0) { $lines = array_slice($lines, max(count($lines) - $first - $num, 0), $num); }
|
|
else if($first > 0 && $num == 0) { $lines = array_slice($lines, 0, max(count($lines) - $first, 0)); }
|
|
else if($first == 0 && $num > 0) { $lines = array_slice($lines, max(count($lines) - $num, 0)); }
|
|
|
|
// handle lines in reverse order
|
|
for($i = count($lines) - 1; $i >= 0; $i--) {
|
|
$tmp = parseChangelogLine($lines[$i]);
|
|
if($tmp !== false) {
|
|
$this->cache[$this->id][$tmp['date']] = $tmp;
|
|
$revs[] = $tmp['date'];
|
|
}
|
|
}
|
|
|
|
return $revs;
|
|
}
|
|
|
|
/**
|
|
* Get the nth revision left or right handside for a specific page id and revision (timestamp)
|
|
*
|
|
* For large changelog files, only the chunk containing the
|
|
* reference revision $rev is read and sometimes a next chunck.
|
|
*
|
|
* Adjacent changelog lines are optimistically parsed and cached to speed up
|
|
* consecutive calls to getRevisionInfo.
|
|
*
|
|
* @param int $rev revision timestamp used as startdate (doesn't need to be revisionnumber)
|
|
* @param int $direction give position of returned revision with respect to $rev; positive=next, negative=prev
|
|
* @return bool|int
|
|
* timestamp of the requested revision
|
|
* otherwise false
|
|
*/
|
|
public function getRelativeRevision($rev, $direction) {
|
|
$rev = max($rev, 0);
|
|
$direction = (int) $direction;
|
|
|
|
//no direction given or last rev, so no follow-up
|
|
if(!$direction || ($direction > 0 && $this->isCurrentRevision($rev))) {
|
|
return false;
|
|
}
|
|
|
|
//get lines from changelog
|
|
list($fp, $lines, $head, $tail, $eof) = $this->readloglines($rev);
|
|
if(empty($lines)) return false;
|
|
|
|
// look for revisions later/earlier then $rev, when founded count till the wanted revision is reached
|
|
// also parse and cache changelog lines for getRevisionInfo().
|
|
$revcounter = 0;
|
|
$relativerev = false;
|
|
$checkotherchunck = true; //always runs once
|
|
while(!$relativerev && $checkotherchunck) {
|
|
$tmp = array();
|
|
//parse in normal or reverse order
|
|
$count = count($lines);
|
|
if($direction > 0) {
|
|
$start = 0;
|
|
$step = 1;
|
|
} else {
|
|
$start = $count - 1;
|
|
$step = -1;
|
|
}
|
|
for($i = $start; $i >= 0 && $i < $count; $i = $i + $step) {
|
|
$tmp = parseChangelogLine($lines[$i]);
|
|
if($tmp !== false) {
|
|
$this->cache[$this->id][$tmp['date']] = $tmp;
|
|
//look for revs older/earlier then reference $rev and select $direction-th one
|
|
if(($direction > 0 && $tmp['date'] > $rev) || ($direction < 0 && $tmp['date'] < $rev)) {
|
|
$revcounter++;
|
|
if($revcounter == abs($direction)) {
|
|
$relativerev = $tmp['date'];
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
//true when $rev is found, but not the wanted follow-up.
|
|
$checkotherchunck = $fp
|
|
&& ($tmp['date'] == $rev || ($revcounter > 0 && !$relativerev))
|
|
&& !(($tail == $eof && $direction > 0) || ($head == 0 && $direction < 0));
|
|
|
|
if($checkotherchunck) {
|
|
list($lines, $head, $tail) = $this->readAdjacentChunk($fp, $head, $tail, $direction);
|
|
|
|
if(empty($lines)) break;
|
|
}
|
|
}
|
|
if($fp) {
|
|
fclose($fp);
|
|
}
|
|
|
|
return $relativerev;
|
|
}
|
|
|
|
/**
|
|
* Returns revisions around rev1 and rev2
|
|
* When available it returns $max entries for each revision
|
|
*
|
|
* @param int $rev1 oldest revision timestamp
|
|
* @param int $rev2 newest revision timestamp (0 looks up last revision)
|
|
* @param int $max maximum number of revisions returned
|
|
* @return array with two arrays with revisions surrounding rev1 respectively rev2
|
|
*/
|
|
public function getRevisionsAround($rev1, $rev2, $max = 50) {
|
|
$max = floor(abs($max) / 2)*2 + 1;
|
|
$rev1 = max($rev1, 0);
|
|
$rev2 = max($rev2, 0);
|
|
|
|
if($rev2) {
|
|
if($rev2 < $rev1) {
|
|
$rev = $rev2;
|
|
$rev2 = $rev1;
|
|
$rev1 = $rev;
|
|
}
|
|
} else {
|
|
//empty right side means a removed page. Look up last revision.
|
|
$revs = $this->getRevisions(-1, 1);
|
|
$rev2 = $revs[0];
|
|
}
|
|
//collect revisions around rev2
|
|
list($revs2, $allrevs, $fp, $lines, $head, $tail) = $this->retrieveRevisionsAround($rev2, $max);
|
|
|
|
if(empty($revs2)) return array(array(), array());
|
|
|
|
//collect revisions around rev1
|
|
$index = array_search($rev1, $allrevs);
|
|
if($index === false) {
|
|
//no overlapping revisions
|
|
list($revs1,,,,,) = $this->retrieveRevisionsAround($rev1, $max);
|
|
if(empty($revs1)) $revs1 = array();
|
|
} else {
|
|
//revisions overlaps, reuse revisions around rev2
|
|
$revs1 = $allrevs;
|
|
while($head > 0) {
|
|
for($i = count($lines) - 1; $i >= 0; $i--) {
|
|
$tmp = parseChangelogLine($lines[$i]);
|
|
if($tmp !== false) {
|
|
$this->cache[$this->id][$tmp['date']] = $tmp;
|
|
$revs1[] = $tmp['date'];
|
|
$index++;
|
|
|
|
if($index > floor($max / 2)) break 2;
|
|
}
|
|
}
|
|
|
|
list($lines, $head, $tail) = $this->readAdjacentChunk($fp, $head, $tail, -1);
|
|
}
|
|
sort($revs1);
|
|
//return wanted selection
|
|
$revs1 = array_slice($revs1, max($index - floor($max/2), 0), $max);
|
|
}
|
|
|
|
return array(array_reverse($revs1), array_reverse($revs2));
|
|
}
|
|
|
|
/**
|
|
* Returns lines from changelog.
|
|
* If file larger than $chuncksize, only chunck is read that could contain $rev.
|
|
*
|
|
* @param int $rev revision timestamp
|
|
* @return array|false
|
|
* if success returns array(fp, array(changeloglines), $head, $tail, $eof)
|
|
* where fp only defined for chuck reading, needs closing.
|
|
* otherwise false
|
|
*/
|
|
protected function readloglines($rev) {
|
|
$file = $this->getChangelogFilename();
|
|
|
|
if(!file_exists($file)) {
|
|
return false;
|
|
}
|
|
|
|
$fp = null;
|
|
$head = 0;
|
|
$tail = 0;
|
|
$eof = 0;
|
|
|
|
if(filesize($file) < $this->chunk_size || $this->chunk_size == 0) {
|
|
// read whole file
|
|
$lines = file($file);
|
|
if($lines === false) {
|
|
return false;
|
|
}
|
|
} else {
|
|
// read by chunk
|
|
$fp = fopen($file, 'rb'); // "file pointer"
|
|
if($fp === false) {
|
|
return false;
|
|
}
|
|
$head = 0;
|
|
fseek($fp, 0, SEEK_END);
|
|
$eof = ftell($fp);
|
|
$tail = $eof;
|
|
|
|
// find chunk
|
|
while($tail - $head > $this->chunk_size) {
|
|
$finger = $head + floor(($tail - $head) / 2.0);
|
|
$finger = $this->getNewlinepointer($fp, $finger);
|
|
$tmp = fgets($fp);
|
|
if($finger == $head || $finger == $tail) {
|
|
break;
|
|
}
|
|
$tmp = parseChangelogLine($tmp);
|
|
$finger_rev = $tmp['date'];
|
|
|
|
if($finger_rev > $rev) {
|
|
$tail = $finger;
|
|
} else {
|
|
$head = $finger;
|
|
}
|
|
}
|
|
|
|
if($tail - $head < 1) {
|
|
// cound not find chunk, assume requested rev is missing
|
|
fclose($fp);
|
|
return false;
|
|
}
|
|
|
|
$lines = $this->readChunk($fp, $head, $tail);
|
|
}
|
|
return array(
|
|
$fp,
|
|
$lines,
|
|
$head,
|
|
$tail,
|
|
$eof
|
|
);
|
|
}
|
|
|
|
/**
|
|
* Read chunk and return array with lines of given chunck.
|
|
* Has no check if $head and $tail are really at a new line
|
|
*
|
|
* @param resource $fp resource filepointer
|
|
* @param int $head start point chunck
|
|
* @param int $tail end point chunck
|
|
* @return array lines read from chunck
|
|
*/
|
|
protected function readChunk($fp, $head, $tail) {
|
|
$chunk = '';
|
|
$chunk_size = max($tail - $head, 0); // found chunk size
|
|
$got = 0;
|
|
fseek($fp, $head);
|
|
while($got < $chunk_size && !feof($fp)) {
|
|
$tmp = @fread($fp, max(min($this->chunk_size, $chunk_size - $got), 0));
|
|
if($tmp === false) { //error state
|
|
break;
|
|
}
|
|
$got += strlen($tmp);
|
|
$chunk .= $tmp;
|
|
}
|
|
$lines = explode("\n", $chunk);
|
|
array_pop($lines); // remove trailing newline
|
|
return $lines;
|
|
}
|
|
|
|
/**
|
|
* Set pointer to first new line after $finger and return its position
|
|
*
|
|
* @param resource $fp filepointer
|
|
* @param int $finger a pointer
|
|
* @return int pointer
|
|
*/
|
|
protected function getNewlinepointer($fp, $finger) {
|
|
fseek($fp, $finger);
|
|
$nl = $finger;
|
|
if($finger > 0) {
|
|
fgets($fp); // slip the finger forward to a new line
|
|
$nl = ftell($fp);
|
|
}
|
|
return $nl;
|
|
}
|
|
|
|
/**
|
|
* Check whether given revision is the current page
|
|
*
|
|
* @param int $rev timestamp of current page
|
|
* @return bool true if $rev is current revision, otherwise false
|
|
*/
|
|
public function isCurrentRevision($rev) {
|
|
return $rev == @filemtime($this->getFilename());
|
|
}
|
|
|
|
/**
|
|
* Return an existing revision for a specific date which is
|
|
* the current one or younger or equal then the date
|
|
*
|
|
* @param string $id
|
|
* @param number $date_at timestamp
|
|
* @return string revision ('' for current)
|
|
*/
|
|
function getLastRevisionAt($date_at){
|
|
//requested date_at(timestamp) younger or equal then modified_time($this->id) => load current
|
|
if($date_at >= @filemtime($this->getFilename())) {
|
|
return '';
|
|
} else if ($rev = $this->getRelativeRevision($date_at+1, -1)) { //+1 to get also the requested date revision
|
|
return $rev;
|
|
} else {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Returns the next lines of the changelog of the chunck before head or after tail
|
|
*
|
|
* @param resource $fp filepointer
|
|
* @param int $head position head of last chunk
|
|
* @param int $tail position tail of last chunk
|
|
* @param int $direction positive forward, negative backward
|
|
* @return array with entries:
|
|
* - $lines: changelog lines of readed chunk
|
|
* - $head: head of chunk
|
|
* - $tail: tail of chunk
|
|
*/
|
|
protected function readAdjacentChunk($fp, $head, $tail, $direction) {
|
|
if(!$fp) return array(array(), $head, $tail);
|
|
|
|
if($direction > 0) {
|
|
//read forward
|
|
$head = $tail;
|
|
$tail = $head + floor($this->chunk_size * (2 / 3));
|
|
$tail = $this->getNewlinepointer($fp, $tail);
|
|
} else {
|
|
//read backward
|
|
$tail = $head;
|
|
$head = max($tail - $this->chunk_size, 0);
|
|
while(true) {
|
|
$nl = $this->getNewlinepointer($fp, $head);
|
|
// was the chunk big enough? if not, take another bite
|
|
if($nl > 0 && $tail <= $nl) {
|
|
$head = max($head - $this->chunk_size, 0);
|
|
} else {
|
|
$head = $nl;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
//load next chunck
|
|
$lines = $this->readChunk($fp, $head, $tail);
|
|
return array($lines, $head, $tail);
|
|
}
|
|
|
|
/**
|
|
* Collect the $max revisions near to the timestamp $rev
|
|
*
|
|
* @param int $rev revision timestamp
|
|
* @param int $max maximum number of revisions to be returned
|
|
* @return bool|array
|
|
* return array with entries:
|
|
* - $requestedrevs: array of with $max revision timestamps
|
|
* - $revs: all parsed revision timestamps
|
|
* - $fp: filepointer only defined for chuck reading, needs closing.
|
|
* - $lines: non-parsed changelog lines before the parsed revisions
|
|
* - $head: position of first readed changelogline
|
|
* - $lasttail: position of end of last readed changelogline
|
|
* otherwise false
|
|
*/
|
|
protected function retrieveRevisionsAround($rev, $max) {
|
|
//get lines from changelog
|
|
list($fp, $lines, $starthead, $starttail, /* $eof */) = $this->readloglines($rev);
|
|
if(empty($lines)) return false;
|
|
|
|
//parse chunk containing $rev, and read forward more chunks until $max/2 is reached
|
|
$head = $starthead;
|
|
$tail = $starttail;
|
|
$revs = array();
|
|
$aftercount = $beforecount = 0;
|
|
while(count($lines) > 0) {
|
|
foreach($lines as $line) {
|
|
$tmp = parseChangelogLine($line);
|
|
if($tmp !== false) {
|
|
$this->cache[$this->id][$tmp['date']] = $tmp;
|
|
$revs[] = $tmp['date'];
|
|
if($tmp['date'] >= $rev) {
|
|
//count revs after reference $rev
|
|
$aftercount++;
|
|
if($aftercount == 1) $beforecount = count($revs);
|
|
}
|
|
//enough revs after reference $rev?
|
|
if($aftercount > floor($max / 2)) break 2;
|
|
}
|
|
}
|
|
//retrieve next chunk
|
|
list($lines, $head, $tail) = $this->readAdjacentChunk($fp, $head, $tail, 1);
|
|
}
|
|
if($aftercount == 0) return false;
|
|
|
|
$lasttail = $tail;
|
|
|
|
//read additional chuncks backward until $max/2 is reached and total number of revs is equal to $max
|
|
$lines = array();
|
|
$i = 0;
|
|
if($aftercount > 0) {
|
|
$head = $starthead;
|
|
$tail = $starttail;
|
|
while($head > 0) {
|
|
list($lines, $head, $tail) = $this->readAdjacentChunk($fp, $head, $tail, -1);
|
|
|
|
for($i = count($lines) - 1; $i >= 0; $i--) {
|
|
$tmp = parseChangelogLine($lines[$i]);
|
|
if($tmp !== false) {
|
|
$this->cache[$this->id][$tmp['date']] = $tmp;
|
|
$revs[] = $tmp['date'];
|
|
$beforecount++;
|
|
//enough revs before reference $rev?
|
|
if($beforecount > max(floor($max / 2), $max - $aftercount)) break 2;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
sort($revs);
|
|
|
|
//keep only non-parsed lines
|
|
$lines = array_slice($lines, 0, $i);
|
|
//trunk desired selection
|
|
$requestedrevs = array_slice($revs, -$max, $max);
|
|
|
|
return array($requestedrevs, $revs, $fp, $lines, $head, $lasttail);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Class PageChangelog handles changelog of a wiki page
|
|
*/
|
|
class PageChangelog extends ChangeLog {
|
|
|
|
/**
|
|
* Returns path to changelog
|
|
*
|
|
* @return string path to file
|
|
*/
|
|
protected function getChangelogFilename() {
|
|
return metaFN($this->id, '.changes');
|
|
}
|
|
|
|
/**
|
|
* Returns path to current page/media
|
|
*
|
|
* @return string path to file
|
|
*/
|
|
protected function getFilename() {
|
|
return wikiFN($this->id);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Class MediaChangelog handles changelog of a media file
|
|
*/
|
|
class MediaChangelog extends ChangeLog {
|
|
|
|
/**
|
|
* Returns path to changelog
|
|
*
|
|
* @return string path to file
|
|
*/
|
|
protected function getChangelogFilename() {
|
|
return mediaMetaFN($this->id, '.changes');
|
|
}
|
|
|
|
/**
|
|
* Returns path to current page/media
|
|
*
|
|
* @return string path to file
|
|
*/
|
|
protected function getFilename() {
|
|
return mediaFN($this->id);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Get the changelog information for a specific page id
|
|
* and revision (timestamp). Adjacent changelog lines
|
|
* are optimistically parsed and cached to speed up
|
|
* consecutive calls to getRevisionInfo. For large
|
|
* changelog files, only the chunk containing the
|
|
* requested changelog line is read.
|
|
*
|
|
* @deprecated 2013-11-20
|
|
*
|
|
* @author Ben Coburn <btcoburn@silicodon.net>
|
|
* @author Kate Arzamastseva <pshns@ukr.net>
|
|
*/
|
|
function getRevisionInfo($id, $rev, $chunk_size = 8192, $media = false) {
|
|
dbg_deprecated('class PageChangeLog or class MediaChangelog');
|
|
if($media) {
|
|
$changelog = new MediaChangeLog($id, $chunk_size);
|
|
} else {
|
|
$changelog = new PageChangeLog($id, $chunk_size);
|
|
}
|
|
return $changelog->getRevisionInfo($rev);
|
|
}
|
|
|
|
/**
|
|
* Return a list of page revisions numbers
|
|
* Does not guarantee that the revision exists in the attic,
|
|
* only that a line with the date exists in the changelog.
|
|
* By default the current revision is skipped.
|
|
*
|
|
* The current revision is automatically skipped when the page exists.
|
|
* See $INFO['meta']['last_change'] for the current revision.
|
|
*
|
|
* For efficiency, the log lines are parsed and cached for later
|
|
* calls to getRevisionInfo. Large changelog files are read
|
|
* backwards in chunks until the requested number of changelog
|
|
* lines are recieved.
|
|
*
|
|
* @deprecated 2013-11-20
|
|
*
|
|
* @author Ben Coburn <btcoburn@silicodon.net>
|
|
* @author Kate Arzamastseva <pshns@ukr.net>
|
|
*
|
|
* @param string $id the page of interest
|
|
* @param int $first skip the first n changelog lines
|
|
* @param int $num number of revisions to return
|
|
* @param int $chunk_size
|
|
* @param bool $media
|
|
* @return array
|
|
*/
|
|
function getRevisions($id, $first, $num, $chunk_size = 8192, $media = false) {
|
|
dbg_deprecated('class PageChangeLog or class MediaChangelog');
|
|
if($media) {
|
|
$changelog = new MediaChangeLog($id, $chunk_size);
|
|
} else {
|
|
$changelog = new PageChangeLog($id, $chunk_size);
|
|
}
|
|
return $changelog->getRevisions($first, $num);
|
|
}
|
|
|