forked from extern/egroupware
264 lines
7.3 KiB
PHP
264 lines
7.3 KiB
PHP
<?php
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/**
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* EGroupware - Ajax log file viewer (tail -f)
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*
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* @link http://www.egroupware.org
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* @author Ralf Becker <RalfBecker@outdoor-training.de>
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* @copyright 2012 by RalfBecker@outdoor-training.de
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* @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
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* @package etemplate
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* @subpackage api
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* @version $Id$
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*/
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/**
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* Ajax log file viewer (tail -f)
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*
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* To not allow to view arbitrary files, allowed filenames are stored in the session.
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* Class fetches log-file periodically in chunks for 8k.
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* If fetch returns no new content next request will be in 2s, otherwise in 200ms.
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* As logfiles can be quiet huge, we display at max the last 32k of it!
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*
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* Example usage:
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*
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* $error_log = new egw_tail('/var/log/apache2/error_log');
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* echo $error_log->show();
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*
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* Strongly prefered for security reasons is to use a path relative to EGroupware's files_dir,
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* eg. new egw_tail('groupdav/somelog')!
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*/
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class egw_tail
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{
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/**
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* Maximum size of single ajax request
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*
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* Currently also maximum size / 4 of displayed logfile content!
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*/
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const MAX_CHUNK_SIZE = 8192;
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/**
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* Contains allowed filenames to display, we can NOT allow to display arbitrary files!
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*
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* @param array
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*/
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protected $filenames;
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/**
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* Filename class is instanciated to view, set by constructor
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*
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* @param string
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*/
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protected $filename;
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/**
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* Methods allowed to call via menuaction
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*
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* @var array
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*/
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public $public_functions = array(
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'download' => true,
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);
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/**
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* Constructor
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*
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* @param string $filename=null if not starting with as slash relative to EGw files dir (this is strongly prefered for security reasons)
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*/
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public function __construct($filename=null)
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{
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$this->filenames =& egw_cache::getSession('phpgwapi', __CLASS__);
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if ($filename)
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{
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$this->filename = $filename;
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if (!$this->filenames || !in_array($filename,$this->filenames)) $this->filenames[] = $filename;
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}
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}
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/**
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* Ajax callback to load next chunk of log-file
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*
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* @param string $filename
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* @param int $start=0 last position in log-file
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* @throws egw_exception_wrong_parameter
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*/
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public function ajax_chunk($filename,$start=0)
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{
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if (!in_array($filename,$this->filenames))
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{
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throw new egw_exception_wrong_parameter("Not allowed to view '$filename'!");
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}
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if ($filename[0] != '/') $filename = $GLOBALS['egw_info']['server']['files_dir'].'/'.$filename;
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if (file_exists($filename))
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{
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$size = filesize($filename);
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if (!$start || $start < 0 || $start > $size || $size-$start > 4*self::MAX_CHUNK_SIZE)
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{
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$start = $size - 4*self::MAX_CHUNK_SIZE;
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if ($start < 0) $start = 0;
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}
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$size = egw_vfs::hsize($size);
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$content = file_get_contents($filename, false, null, $start, self::MAX_CHUNK_SIZE);
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$length = bytes($content);
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$writable = is_writable($filename) || is_writable(dirname($filename));
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}
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else
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{
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$start = $length = 0;
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$content = '';
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$writable = $size = false;
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}
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$response = egw_json_response::get();
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$response->data(array( // send all responses as data
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'size' => $size,
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'writable' => $writable,
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'next' => $start + $length,
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'length' => $length,
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'content' => $content,
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));
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}
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/**
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* Ajax callback to delete log-file
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*
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* @param string $filename
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* @param boolean $truncate=false true: truncate file, false: delete file
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* @throws egw_exception_wrong_parameter
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*/
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public function ajax_delete($filename,$truncate=false)
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{
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if (!in_array($filename,$this->filenames))
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{
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throw new egw_exception_wrong_parameter("Not allowed to view '$filename'!");
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}
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if ($filename[0] != '/') $filename = $GLOBALS['egw_info']['server']['files_dir'].'/'.$filename;
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if ($truncate)
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{
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file_put_contents($filename, '');
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}
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else
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{
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unlink($filename);
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}
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}
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/**
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* Return html & javascript for logviewer
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*
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* @param string $header=null default $this->filename
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* @param string $id='log'
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* @return string
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* @throws egw_exception_wrong_parameter
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*/
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public function show($header=null, $id='log')
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{
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if (!isset($this->filename))
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{
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throw new egw_exception_wrong_parameter("Must be instanciated with filename!");
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}
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if (is_null($header)) $header = $this->filename;
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return '
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<script type="text/javascript">
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var '.$id.'_tail_start = 0;
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function button_'.$id.'(button)
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{
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if (button.id != "clear_'.$id.'")
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{
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var ajax = new egw_json_request("home.egw_tail.ajax_delete",["'.$this->filename.'",button.id=="empty_'.$id.'"]);
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ajax.sendRequest(true);
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}
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$j("#'.$id.'").text("");
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}
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function refresh_'.$id.'()
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{
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var ajax = new egw_json_request("home.egw_tail.ajax_chunk",["'.$this->filename.'",'.$id.'_tail_start]);
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ajax.sendRequest(true,function(_data) {
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if (_data.length) {
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'.$id.'_tail_start = _data.next;
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var log = $j("#'.$id.'").append(_data.content.replace(/</g,"<"));
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log.animate({ scrollTop: log.attr("scrollHeight") - log.height() + 20 }, 500);
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}
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if (_data.size === false)
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{
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$j("#download_'.$id.'").hide();
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}
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else
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{
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$j("#download_'.$id.'").show().attr("title","'.lang('Size').': "+_data.size);
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}
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if (_data.writable === false)
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{
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$j("#delete_'.$id.'").hide();
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$j("#empty_'.$id.'").hide();
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}
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else
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{
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$j("#delete_'.$id.'").show();
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$j("#empty_'.$id.'").show();
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}
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window.setTimeout(refresh_'.$id.',_data.length?200:2000);
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});
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}
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function resize_'.$id.'()
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{
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$j("#'.$id.'").width(egw_getWindowInnerWidth()-20).height(egw_getWindowInnerHeight()-33);
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}
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$j(document).ready(function()
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{
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resize_'.$id.'();
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refresh_'.$id.'();
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});
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$j(window).resize(resize_'.$id.');
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</script>
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<p style="float: left; margin: 5px"><b>'.htmlspecialchars($header).'</b></p>
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<div style="float: right; margin: 2px; margin-right: 5px">
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'.html::form(
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html::input('clear_'.$id,lang('Clear window'),'button','id="clear_'.$id.'" onClick="button_'.$id.'(this)"')."\n".
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html::input('delete_'.$id,lang('Delete file'),'button','id="delete_'.$id.'" onClick="button_'.$id.'(this)"')."\n".
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html::input('empty_'.$id,lang('Empty file'),'button','id="empty_'.$id.'" onClick="button_'.$id.'(this)"')."\n".
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html::input('download_'.$id,lang('Download'),'submit','id="download_'.$id.'"'),
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'','/index.php',array(
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'menuaction' => 'phpgwapi.egw_tail.download',
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'filename' => $this->filename,
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)).'
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</div>
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<pre class="tail" id="'.$id.'" style="clear: both; width: 99.5%; border: 2px groove silver; margin-bottom: 0; overflow: auto;"></pre>';
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}
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/**
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* Download a file specified per GET parameter (must be in $this->filesnames!)
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*
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* @throws egw_exception_wrong_parameter
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*/
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public function download()
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{
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$filename = $_GET['filename'];
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if (!in_array($filename,$this->filenames))
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{
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throw new egw_exception_wrong_parameter("Not allowed to download '$filename'!");
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}
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html::content_header(basename($filename),'text/plain');
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if ($filename[0] != '/') $filename = $GLOBALS['egw_info']['server']['files_dir'].'/'.$filename;
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while(ob_get_level()) ob_end_clean(); // stop all output buffering, to NOT run into memory_limit
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readfile($filename);
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common::egw_exit();
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}
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}
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// some testcode, if this file is called via it's URL (you need to uncomment and adapt filename!)
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/*if (isset($_SERVER['SCRIPT_FILENAME']) && $_SERVER['SCRIPT_FILENAME'] == __FILE__)
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{
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$GLOBALS['egw_info'] = array(
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'flags' => array(
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'currentapp' => 'admin',
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'nonavbar' => true,
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),
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);
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include_once '../../header.inc.php';
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$error_log = new egw_tail('/opt/local/apache2/logs/error_log');
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echo $error_log->show();
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}*/ |