679 lines
25 KiB
PHP
679 lines
25 KiB
PHP
<?php
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namespace dokuwiki\ChangeLog;
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use dokuwiki\Logger;
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/**
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* ChangeLog Prototype; methods for handling changelog
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*/
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abstract class ChangeLog
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{
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use ChangeLogTrait;
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/** @var string */
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protected $id;
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/** @var false|int */
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protected $currentRevision;
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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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{
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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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* 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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* Check whether given revision is the current page
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*
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* @param int $rev timestamp of current page
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* @return bool true if $rev is current revision, otherwise false
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*/
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public function isCurrentRevision($rev)
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{
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return $rev == $this->currentRevision();
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}
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/**
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* Checks if the revision is last revision
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*
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* @param int $rev revision timestamp
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* @return bool true if $rev is last revision, otherwise false
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*/
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public function isLastRevision($rev = null)
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{
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return $rev === $this->lastRevision();
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}
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/**
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* Return the current revision identifier
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*
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* The "current" revision means current version of the page or media file. It is either
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* identical with or newer than the "last" revision, that depends on whether the file
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* has modified, created or deleted outside of DokuWiki.
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* The value of identifier can be determined by timestamp as far as the file exists,
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* otherwise it must be assigned larger than any other revisions to keep them sortable.
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*
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* @return int|false revision timestamp
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*/
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public function currentRevision()
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{
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if (!isset($this->currentRevision)) {
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// set ChangeLog::currentRevision property
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$this->getCurrentRevisionInfo();
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}
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return $this->currentRevision;
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}
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/**
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* Return the last revision identifier, date value of the last entry of the changelog
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*
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* @return int|false revision timestamp
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*/
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public function lastRevision()
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{
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$revs = $this->getRevisions(-1, 1);
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return empty($revs) ? false : $revs[0];
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}
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/**
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* Save revision info to the cache pool
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*
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* @param array $info Revision info structure
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* @return bool
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*/
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protected function cacheRevisionInfo($info)
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{
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if (!is_array($info)) return false;
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//$this->cache[$this->id][$info['date']] ??= $info; // since php 7.4
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$this->cache[$this->id][$info['date']] = $this->cache[$this->id][$info['date']] ?? $info;
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return true;
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}
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/**
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* Get the changelog information for a specific 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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* @param bool $retrieveCurrentRevInfo allows to skip for getting other revision info in the
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* getCurrentRevisionInfo() where $currentRevision is not yet determined
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* @return bool|array false or array with entries:
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* - date: unix timestamp
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* - ip: IPv4 address (127.0.0.1)
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* - type: log line type
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* - id: page id
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* - user: user name
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* - sum: edit summary (or action reason)
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* - extra: extra data (varies by line type)
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* - sizechange: change of filesize
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*
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* @author Ben Coburn <btcoburn@silicodon.net>
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* @author Kate Arzamastseva <pshns@ukr.net>
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*/
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public function getRevisionInfo($rev, $retrieveCurrentRevInfo = true)
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{
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$rev = max(0, $rev);
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if (!$rev) return false;
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//ensure the external edits are cached as well
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if (!isset($this->currentRevision) && $retrieveCurrentRevInfo) {
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$this->getCurrentRevisionInfo();
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}
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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 $value) {
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$info = $this->parseLogLine($value);
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$this->cacheRevisionInfo($info);
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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 received.
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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, $num)
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{
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$revs = array();
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$lines = array();
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$count = 0;
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$logfile = $this->getChangelogFilename();
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if (!file_exists($logfile)) return $revs;
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$num = max($num, 0);
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if ($num == 0) {
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return $revs;
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}
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if ($first < 0) {
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$first = 0;
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} else {
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$fileLastMod = $this->getFilename();
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if (file_exists($fileLastMod) && $this->isLastRevision(filemtime($fileLastMod))) {
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// skip last revision if the page exists
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$first = max($first + 1, 0);
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}
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}
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if (filesize($logfile) < $this->chunk_size || $this->chunk_size == 0) {
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// read whole file
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$lines = file($logfile);
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if ($lines === false) {
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return $revs;
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}
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} else {
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// read chunks backwards
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$fp = fopen($logfile, 'rb'); // "file pointer"
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if ($fp === false) {
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return $revs;
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}
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fseek($fp, 0, SEEK_END);
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$tail = ftell($fp);
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// chunk backwards
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$finger = max($tail - $this->chunk_size, 0);
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while ($count < $num + $first) {
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$nl = $this->getNewlinepointer($fp, $finger);
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// was the chunk big enough? if not, take another bite
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if ($nl > 0 && $tail <= $nl) {
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$finger = max($finger - $this->chunk_size, 0);
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continue;
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} else {
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$finger = $nl;
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}
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// read chunk
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$chunk = '';
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$read_size = max($tail - $finger, 0); // found chunk size
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$got = 0;
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while ($got < $read_size && !feof($fp)) {
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$tmp = @fread($fp, max(min($this->chunk_size, $read_size - $got), 0));
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if ($tmp === false) {
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break;
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} //error state
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$got += strlen($tmp);
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$chunk .= $tmp;
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}
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$tmp = explode("\n", $chunk);
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array_pop($tmp); // remove trailing newline
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// combine with previous chunk
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$count += count($tmp);
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$lines = array_merge($tmp, $lines);
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// next chunk
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if ($finger == 0) {
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break;
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} else { // already read all the lines
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$tail = $finger;
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$finger = max($tail - $this->chunk_size, 0);
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}
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}
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fclose($fp);
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}
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// skip parsing extra lines
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$num = max(min(count($lines) - $first, $num), 0);
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if ($first > 0 && $num > 0) {
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$lines = array_slice($lines, max(count($lines) - $first - $num, 0), $num);
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} elseif ($first > 0 && $num == 0) {
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$lines = array_slice($lines, 0, max(count($lines) - $first, 0));
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} elseif ($first == 0 && $num > 0) {
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$lines = array_slice($lines, max(count($lines) - $num, 0));
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}
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// handle lines in reverse order
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for ($i = count($lines) - 1; $i >= 0; $i--) {
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$info = $this->parseLogLine($lines[$i]);
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if ($this->cacheRevisionInfo($info)) {
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$revs[] = $info['date'];
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}
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}
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return $revs;
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}
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/**
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* Get the nth revision left or right-hand side for a specific page id and revision (timestamp)
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*
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* For large changelog files, only the chunk containing the
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* reference revision $rev is read and sometimes a next chunk.
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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.
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*
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* @param int $rev revision timestamp used as start date
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* (doesn't need to be exact revision number)
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* @param int $direction give position of returned revision with respect to $rev;
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positive=next, negative=prev
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* @return bool|int
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* timestamp of the requested revision
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* otherwise false
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*/
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public function getRelativeRevision($rev, $direction)
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{
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$rev = max($rev, 0);
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$direction = (int)$direction;
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//no direction given or last rev, so no follow-up
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if (!$direction || ($direction > 0 && $this->isCurrentRevision($rev))) {
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return false;
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}
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//get lines from changelog
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list($fp, $lines, $head, $tail, $eof) = $this->readloglines($rev);
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if (empty($lines)) return false;
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// look for revisions later/earlier than $rev, when founded count till the wanted revision is reached
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// also parse and cache changelog lines for getRevisionInfo().
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$revCounter = 0;
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$relativeRev = false;
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$checkOtherChunk = true; //always runs once
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while (!$relativeRev && $checkOtherChunk) {
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$info = array();
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//parse in normal or reverse order
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$count = count($lines);
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if ($direction > 0) {
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$start = 0;
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$step = 1;
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} else {
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$start = $count - 1;
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$step = -1;
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}
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for ($i = $start; $i >= 0 && $i < $count; $i = $i + $step) {
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$info = $this->parseLogLine($lines[$i]);
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if ($this->cacheRevisionInfo($info)) {
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//look for revs older/earlier then reference $rev and select $direction-th one
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if (($direction > 0 && $info['date'] > $rev) || ($direction < 0 && $info['date'] < $rev)) {
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$revCounter++;
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if ($revCounter == abs($direction)) {
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$relativeRev = $info['date'];
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}
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}
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}
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}
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//true when $rev is found, but not the wanted follow-up.
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$checkOtherChunk = $fp
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&& ($info['date'] == $rev || ($revCounter > 0 && !$relativeRev))
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&& !(($tail == $eof && $direction > 0) || ($head == 0 && $direction < 0));
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if ($checkOtherChunk) {
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list($lines, $head, $tail) = $this->readAdjacentChunk($fp, $head, $tail, $direction);
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if (empty($lines)) break;
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}
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}
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if ($fp) {
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fclose($fp);
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}
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return $relativeRev;
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}
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/**
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* Returns revisions around rev1 and rev2
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* When available it returns $max entries for each revision
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*
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* @param int $rev1 oldest revision timestamp
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* @param int $rev2 newest revision timestamp (0 looks up last revision)
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* @param int $max maximum number of revisions returned
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* @return array with two arrays with revisions surrounding rev1 respectively rev2
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*/
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public function getRevisionsAround($rev1, $rev2, $max = 50)
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{
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$max = intval(abs($max) / 2) * 2 + 1;
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$rev1 = max($rev1, 0);
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$rev2 = max($rev2, 0);
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if ($rev2) {
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if ($rev2 < $rev1) {
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$rev = $rev2;
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$rev2 = $rev1;
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$rev1 = $rev;
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}
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} else {
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//empty right side means a removed page. Look up last revision.
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$rev2 = $this->currentRevision();
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}
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//collect revisions around rev2
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list($revs2, $allRevs, $fp, $lines, $head, $tail) = $this->retrieveRevisionsAround($rev2, $max);
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if (empty($revs2)) return array(array(), array());
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//collect revisions around rev1
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$index = array_search($rev1, $allRevs);
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if ($index === false) {
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//no overlapping revisions
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list($revs1, , , , ,) = $this->retrieveRevisionsAround($rev1, $max);
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if (empty($revs1)) $revs1 = array();
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} else {
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//revisions overlaps, reuse revisions around rev2
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$lastRev = array_pop($allRevs); //keep last entry that could be external edit
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$revs1 = $allRevs;
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while ($head > 0) {
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for ($i = count($lines) - 1; $i >= 0; $i--) {
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$info = $this->parseLogLine($lines[$i]);
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if ($this->cacheRevisionInfo($info)) {
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$revs1[] = $info['date'];
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$index++;
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if ($index > intval($max / 2)) break 2;
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}
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}
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list($lines, $head, $tail) = $this->readAdjacentChunk($fp, $head, $tail, -1);
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}
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sort($revs1);
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$revs1[] = $lastRev; //push back last entry
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//return wanted selection
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$revs1 = array_slice($revs1, max($index - intval($max / 2), 0), $max);
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}
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return array(array_reverse($revs1), array_reverse($revs2));
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}
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/**
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* Return an existing revision for a specific date which is
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* the current one or younger or equal then the date
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*
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* @param number $date_at timestamp
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* @return string revision ('' for current)
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*/
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public function getLastRevisionAt($date_at)
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{
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$fileLastMod = $this->getFilename();
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//requested date_at(timestamp) younger or equal then modified_time($this->id) => load current
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if (file_exists($fileLastMod) && $date_at >= @filemtime($fileLastMod)) {
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return '';
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} else {
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if ($rev = $this->getRelativeRevision($date_at + 1, -1)) { //+1 to get also the requested date revision
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return $rev;
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} else {
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return false;
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}
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}
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}
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/**
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* Collect the $max revisions near to the timestamp $rev
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*
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* Ideally, half of retrieved timestamps are older than $rev, another half are newer.
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* The returned array $requestedRevs may not contain the reference timestamp $rev
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* when it does not match any revision value recorded in changelog.
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*
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* @param int $rev revision timestamp
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* @param int $max maximum number of revisions to be returned
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* @return bool|array
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* return array with entries:
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* - $requestedRevs: array of with $max revision timestamps
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* - $revs: all parsed revision timestamps
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* - $fp: file pointer only defined for chuck reading, needs closing.
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* - $lines: non-parsed changelog lines before the parsed revisions
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* - $head: position of first read changelog line
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* - $lastTail: position of end of last read changelog line
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* otherwise false
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*/
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protected function retrieveRevisionsAround($rev, $max)
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{
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$revs = array();
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$afterCount = $beforeCount = 0;
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//get lines from changelog
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list($fp, $lines, $startHead, $startTail, $eof) = $this->readloglines($rev);
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if (empty($lines)) return false;
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//parse changelog lines in chunk, and read forward more chunks until $max/2 is reached
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$head = $startHead;
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$tail = $startTail;
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while (count($lines) > 0) {
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foreach ($lines as $line) {
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$info = $this->parseLogLine($line);
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if ($this->cacheRevisionInfo($info)) {
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$revs[] = $info['date'];
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if ($info['date'] >= $rev) {
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//count revs after reference $rev
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$afterCount++;
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if ($afterCount == 1) $beforeCount = count($revs);
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}
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//enough revs after reference $rev?
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if ($afterCount > intval($max / 2)) break 2;
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}
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}
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//retrieve next chunk
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list($lines, $head, $tail) = $this->readAdjacentChunk($fp, $head, $tail, 1);
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}
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$lastTail = $tail;
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// add a possible revision of external edit, create or deletion
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if ($lastTail == $eof && $afterCount <= intval($max / 2) &&
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count($revs) && !$this->isCurrentRevision($revs[count($revs)-1])
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) {
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$revs[] = $this->currentRevision;
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$afterCount++;
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}
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if ($afterCount == 0) {
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//given timestamp $rev is newer than the most recent line in chunk
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return false; //FIXME: or proceed to collect older revisions?
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}
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//read more chunks backward until $max/2 is reached and total number of revs is equal to $max
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$lines = array();
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$i = 0;
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if ($afterCount > 0) {
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|
$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--) {
|
|
$info = $this->parseLogLine($lines[$i]);
|
|
if ($this->cacheRevisionInfo($info)) {
|
|
$revs[] = $info['date'];
|
|
$beforeCount++;
|
|
//enough revs before reference $rev?
|
|
if ($beforeCount > max(intval($max / 2), $max - $afterCount)) break 2;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
//keep only non-parsed lines
|
|
$lines = array_slice($lines, 0, $i);
|
|
|
|
sort($revs);
|
|
|
|
//trunk desired selection
|
|
$requestedRevs = array_slice($revs, -$max, $max);
|
|
|
|
return array($requestedRevs, $revs, $fp, $lines, $head, $lastTail);
|
|
}
|
|
|
|
/**
|
|
* Get the current revision information, considering external edit, create or deletion
|
|
*
|
|
* When the file has not modified since its last revision, the information of the last
|
|
* change that had already recorded in the changelog is returned as current change info.
|
|
* Otherwise, the change information since the last revision caused outside DokuWiki
|
|
* should be returned, which is referred as "external revision".
|
|
*
|
|
* The change date of the file can be determined by timestamp as far as the file exists,
|
|
* however this is not possible when the file has already deleted outside of DokuWiki.
|
|
* In such case we assign 1 sec before current time() for the external deletion.
|
|
* As a result, the value of current revision identifier may change each time because:
|
|
* 1) the file has again modified outside of DokuWiki, or
|
|
* 2) the value is essentially volatile for deleted but once existed files.
|
|
*
|
|
* @return bool|array false when page had never existed or array with entries:
|
|
* - date: revision identifier (timestamp or last revision +1)
|
|
* - ip: IPv4 address (127.0.0.1)
|
|
* - type: log line type
|
|
* - id: id of page or media
|
|
* - user: user name
|
|
* - sum: edit summary (or action reason)
|
|
* - extra: extra data (varies by line type)
|
|
* - sizechange: change of filesize
|
|
* - timestamp: unix timestamp or false (key set only for external edit occurred)
|
|
*
|
|
* @author Satoshi Sahara <sahara.satoshi@gmail.com>
|
|
*/
|
|
public function getCurrentRevisionInfo()
|
|
{
|
|
global $lang;
|
|
|
|
if (isset($this->currentRevision)) return $this->getRevisionInfo($this->currentRevision);
|
|
|
|
// get revision id from the item file timestamp and changelog
|
|
$fileLastMod = $this->getFilename();
|
|
$fileRev = @filemtime($fileLastMod); // false when the file not exist
|
|
$lastRev = $this->lastRevision(); // false when no changelog
|
|
|
|
if (!$fileRev && !$lastRev) { // has never existed
|
|
$this->currentRevision = false;
|
|
return false;
|
|
} elseif ($fileRev === $lastRev) { // not external edit
|
|
$this->currentRevision = $lastRev;
|
|
return $this->getRevisionInfo($lastRev);
|
|
}
|
|
|
|
if (!$fileRev && $lastRev) { // item file does not exist
|
|
// check consistency against changelog
|
|
$revInfo = $this->getRevisionInfo($lastRev, false);
|
|
if ($revInfo['type'] == DOKU_CHANGE_TYPE_DELETE) {
|
|
$this->currentRevision = $lastRev;
|
|
return $revInfo;
|
|
}
|
|
|
|
// externally deleted, set revision date as late as possible
|
|
$revInfo = [
|
|
'date' => max($lastRev +1, time() -1), // 1 sec before now or new page save
|
|
'ip' => '127.0.0.1',
|
|
'type' => DOKU_CHANGE_TYPE_DELETE,
|
|
'id' => $this->id,
|
|
'user' => '',
|
|
'sum' => $lang['deleted'].' - '.$lang['external_edit'].' ('.$lang['unknowndate'].')',
|
|
'extra' => '',
|
|
'sizechange' => -io_getSizeFile($this->getFilename($lastRev)),
|
|
'timestamp' => false,
|
|
];
|
|
|
|
} else { // item file exists, with timestamp $fileRev
|
|
// here, file timestamp $fileRev is different with last revision timestamp $lastRev in changelog
|
|
$isJustCreated = $lastRev === false || (
|
|
$fileRev > $lastRev &&
|
|
$this->getRevisionInfo($lastRev, false)['type'] == DOKU_CHANGE_TYPE_DELETE
|
|
);
|
|
$filesize_new = filesize($this->getFilename());
|
|
$filesize_old = $isJustCreated ? 0 : io_getSizeFile($this->getFilename($lastRev));
|
|
$sizechange = $filesize_new - $filesize_old;
|
|
|
|
if ($isJustCreated) {
|
|
$timestamp = $fileRev;
|
|
$sum = $lang['created'].' - '.$lang['external_edit'];
|
|
} elseif ($fileRev > $lastRev) {
|
|
$timestamp = $fileRev;
|
|
$sum = $lang['external_edit'];
|
|
} else {
|
|
// $fileRev is older than $lastRev, that is erroneous/incorrect occurrence.
|
|
$msg = "Warning: current file modification time is older than last revision date";
|
|
$details = 'File revision: '.$fileRev.' '.dformat($fileRev, "%Y-%m-%d %H:%M:%S")."\n"
|
|
.'Last revision: '.$lastRev.' '.dformat($lastRev, "%Y-%m-%d %H:%M:%S");
|
|
Logger::error($msg, $details, $this->getFilename());
|
|
$timestamp = false;
|
|
$sum = $lang['external_edit'].' ('.$lang['unknowndate'].')';
|
|
}
|
|
|
|
// externally created or edited
|
|
$revInfo = [
|
|
'date' => $timestamp ?: $lastRev +1,
|
|
'ip' => '127.0.0.1',
|
|
'type' => $isJustCreated ? DOKU_CHANGE_TYPE_CREATE : DOKU_CHANGE_TYPE_EDIT,
|
|
'id' => $this->id,
|
|
'user' => '',
|
|
'sum' => $sum,
|
|
'extra' => '',
|
|
'sizechange' => $sizechange,
|
|
'timestamp' => $timestamp,
|
|
];
|
|
}
|
|
|
|
// cache current revision information of external edition
|
|
$this->currentRevision = $revInfo['date'];
|
|
$this->cache[$this->id][$this->currentRevision] = $revInfo;
|
|
return $this->getRevisionInfo($this->currentRevision);
|
|
}
|
|
|
|
/**
|
|
* Mechanism to trace no-actual external current revision
|
|
* @param int $rev
|
|
*/
|
|
public function traceCurrentRevision($rev)
|
|
{
|
|
if ($rev > $this->lastRevision()) {
|
|
$rev = $this->currentRevision();
|
|
}
|
|
return $rev;
|
|
}
|
|
}
|