nextcloud/lib/private/log/owncloud.php

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<?php
/**
* ownCloud
*
* @author Robin Appelman
* @copyright 2012 Robin Appelman icewind1991@gmail.com
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
* License as published by the Free Software Foundation; either
* version 3 of the License, or any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU AFFERO GENERAL PUBLIC LICENSE for more details.
*
* You should have received a copy of the GNU Affero General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*
*/
/**
* logging utilities
*
* Log is saved at data/owncloud.log (on default)
*/
class OC_Log_Owncloud {
static protected $logFile;
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/**
* Init class data
*/
public static function init() {
$defaultLogFile = OC_Config::getValue("datadirectory", OC::$SERVERROOT.'/data').'/owncloud.log';
self::$logFile = OC_Config::getValue("logfile", $defaultLogFile);
/*
* Fall back to default log file if specified logfile does not exist
* and can not be created. Error suppression is required in order to
* not end up in the error handler which will try to log the error.
* A better solution (compared to error suppression) would be checking
* !is_writable(dirname(self::$logFile)) before touch(), but
* is_writable() on directories used to be pretty unreliable on Windows
* for at least some time.
*/
if (!file_exists(self::$logFile) && !@touch(self::$logFile)) {
self::$logFile = $defaultLogFile;
}
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}
/**
* write a message in the log
* @param string $app
* @param string $message
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* @param int $level
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*/
public static function write($app, $message, $level) {
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$minLevel=min(OC_Config::getValue( "loglevel", OC_Log::WARN ), OC_Log::ERROR);
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if($level>=$minLevel) {
// default to ISO8601
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$format = OC_Config::getValue('logdateformat', 'c');
$logtimezone=OC_Config::getValue( "logtimezone", 'UTC' );
try {
$timezone = new DateTimeZone($logtimezone);
} catch (Exception $e) {
$timezone = new DateTimeZone('UTC');
}
$time = new DateTime(null, $timezone);
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// remove username/passswords from URLs before writing the to the log file
$entry=array('app'=>$app, 'message'=>$message, 'level'=>$level, 'time'=> $time->format($format));
$entry = json_encode($entry);
$handle = @fopen(self::$logFile, 'a');
@chmod(self::$logFile, 0640);
if ($handle) {
fwrite($handle, $entry."\n");
fclose($handle);
} else {
// Fall back to error_log
error_log($entry);
}
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}
}
/**
* get entries from the log in reverse chronological order
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* @param int $limit
* @param int $offset
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* @return array
*/
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public static function getEntries($limit=50, $offset=0) {
self::init();
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$minLevel=OC_Config::getValue( "loglevel", OC_Log::WARN );
$entries = array();
$handle = @fopen(self::$logFile, 'rb');
if ($handle) {
fseek($handle, 0, SEEK_END);
$pos = ftell($handle);
$line = '';
$entriesCount = 0;
$lines = 0;
// Loop through each character of the file looking for new lines
while ($pos >= 0 && $entriesCount < $limit) {
fseek($handle, $pos);
$ch = fgetc($handle);
if ($ch == "\n" || $pos == 0) {
if ($line != '') {
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// Add the first character if at the start of the file,
// because it doesn't hit the else in the loop
if ($pos == 0) {
$line = $ch.$line;
}
$entry = json_decode($line);
// Add the line as an entry if it is passed the offset and is equal or above the log level
if ($entry->level >= $minLevel) {
$lines++;
if ($lines > $offset) {
$entries[] = $entry;
$entriesCount++;
}
}
$line = '';
}
} else {
$line = $ch.$line;
}
$pos--;
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}
fclose($handle);
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}
return $entries;
}
}