ldapsaisie/public_html/includes/class/class.LSlog.php

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2019-06-28 18:00:37 +02:00
<?php
/*******************************************************************************
* Copyright (C) 2007 Easter-eggs
* http://ldapsaisie.labs.libre-entreprise.org
*
* Author: See AUTHORS file in top-level directory.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
******************************************************************************/
/**
* Handle logging
*
* @author Benjamin Renard <brenard@easter-eggs.com>
*/
class LSlog {
// Enable state
private static $enabled = false;
// Configured handlers
private static $handlers = array();
// Default handlers (if not configured)
private static $default_handlers = array(
array (
'handler' => 'file',
),
);
// Current level
private static $level;
private static $default_level = 'WARNING';
// Levels
private static $levels=array(
'DEBUG' => 0,
'INFO' => 1,
'WARNING' => 2,
'ERROR' => 3,
'FATAL' => 4,
);
/**
* Start/initialize logging
*
* @retval bool True on success, False otherwise
**/
public static function start() {
// Load configuration
self :: $enabled = self :: getConfig('enable', false, 'bool');
self :: $level = self :: getConfig('level', self :: $default_level, 'string');
if (!array_key_exists(self :: $level, self :: $levels)) self :: $level = 'WARNING';
// Load default handlers class
if (!LSsession :: loadLSclass('LSlog_handler', null, true)) {
LSdebug('LSlog disabled');
return False;
}
// Load handlers
$handlers = self :: getConfig('handlers');
if (!is_array($handlers)) $handlers = self :: $default_handlers;
LSdebug($handlers, true);
$debug_handlers = array();
foreach($handlers as $handler => $handler_config) {
if (!is_array($handler_config))
$handler_config = array('handler' => $handler);
else
$handler = (isset($handler_config['handler'])?$handler_config['handler']:'system');
$handler_class = "LSlog_$handler";
// Load handler class
if (!LSsession :: loadLSclass($handler_class) || !class_exists($handler_class)) {
LSerror :: addErrorCode('LSlog_01', $handler);
continue;
}
$handler_obj = new $handler_class($handler_config);
if ($handler_obj -> checkCompatibility())
self :: $handlers[] = $handler_obj;
else
LSdebug("LSlog handler $handler not supported.");
$debug_handlers[] = $handler;
}
LSdebug('LSlog enabled with level='.self :: $level.' and following handlers : '.implode(', ', $debug_handlers));
// Set PHP error/exception handlers
if (self :: $level == 'DEBUG')
set_error_handler(array('LSlog', 'php_error'), E_ALL & ~E_STRICT);
else
set_error_handler(array('LSlog', 'php_error'), E_ALL & ~E_NOTICE & ~E_STRICT & ~E_DEPRECATED);
set_exception_handler(array('LSlog', 'exception'));
return True;
}
/**
* Get a configuration variable value
*
* @param[in] $var string The configuration variable name
* @param[in] $default mixed The default value to return if configuration variable
* is not set (Default : null)
* @param[in] $cast string The type of expected value. The configuration variable
* value will be cast as this type. Could be : bool, int,
* float or string. (Optional, default : raw value)
*
* @retval mixed The configuration variable value
**/
public static function getConfig($var, $default=null, $cast=null) {
return LSconfig :: get($var, $default, $cast, ((isset($GLOBALS['LSlog']) && is_array($GLOBALS['LSlog']))?$GLOBALS['LSlog']:array()));
}
/**
* Log a message
*
* @param[in] $level string The message level
* @param[in] $message string The message
*
* @retval void
**/
private static function logging($level, $message) {
// Check LSlog is enabled
if (!self :: $enabled)
return;
// Check/fix level
if (!array_key_exists($level, self :: $levels))
$level = self :: $default_level;
// Add prefix
if (php_sapi_name() == "cli") {
global $argv;
$message = basename($argv[0])." - $level - $message";
}
else {
$message = $_SERVER['REQUEST_URI'].' - '.$_SERVER['REMOTE_ADDR'].' - '.self :: getLdapServerName().' - '.self :: getAuthenticatedUserDN()." - $level - $message";
}
foreach (self :: $handlers as $handler) {
// Check handler level
if (!$handler -> checkLevel($level))
continue;
// Logging on this handler
call_user_func(array($handler, 'logging'), $level, $message);
}
}
/**
* Check level against configured level
*
* @param[in] $level string The level
* @param[in] $configured_level string|null The configured level (optional, default : self :: $level)
*
* @retval bool True if a message with this level have to be logged, False otherwise
**/
public static function checkLevel($level, $configured_level=null) {
if (is_null($configured_level) || !array_key_exists($configured_level, self :: $levels))
$configured_level = self :: $level;
// On unknown level, use default level
if (!array_key_exists($level, self :: $levels))
$level = self :: $default_level;
return (self :: $levels[$level] >= self :: $levels[$configured_level]);
}
/**
* Helper to retreive current LDAP server name
*
* @retval string Current LDAP server name
**/
private static function getLdapServerName() {
if (LSsession :: $ldapServer) {
if (isset(LSsession :: $ldapServer['name']))
return LSsession :: $ldapServer['name'];
else
return "#".LSsession :: $ldapServerId;
}
return "Not connected";
}
/**
* Helper to retreive current authenticated user DN
*
* @retval string Current authenticated user DN
**/
private static function getAuthenticatedUserDN() {
$auth_dn = LSsession :: getLSuserObjectDn();
if ($auth_dn)
return LSsession :: getLSuserObjectDn();
return "Anonymous";
}
/*
* PHP error logging helpers
*/
/**
* Generate current context backtrace
*
* @retval string Current context backtrace
**/
public static function get_debug_backtrace_context() {
$traces = debug_backtrace();
if (!is_array($traces) || count($traces) <= 2)
return "";
$msg = array();
for ($i=2; $i < count($traces); $i++) {
$trace = array("#$i");
if (isset($traces[$i]['file']))
$trace[] = $traces[$i]['file'].(isset($traces[$i]['line'])?":".$traces[$i]['line']:"");
if (isset($traces[$i]['class']) && isset($traces[$i]['function']))
$trace[] = $traces[$i]['class'] . " " . $traces[$i]['type'] . " " . $traces[$i]['function']. "()";
elseif (isset($traces[$i]['function']))
$trace[] = $traces[$i]['function']. "()";
$msg[] = implode(" - ", $trace);
}
return implode("\n", $msg);
}
/**
* PHP set_exception_handler helper
*
* @see https://www.php.net/set_exception_handler
**/
public static function exception($exception, $prefix=null, $fatal=true) {
$message = ($prefix?"$prefix :\n":"An exception occured :\n"). self :: get_debug_backtrace_context(). "\n" .
"## ".$exception->getFile().":".$exception->getLine(). " : ". $exception->getMessage();
if ($fatal)
self :: fatal($message);
else
self :: error($message);
}
/**
* PHP set_error_handler helper
*
* @see https://www.php.net/set_error_handler
**/
public static function php_error($errno, $errstr, $errfile, $errline) {
$errnos2error = array (
1 => "ERROR",
2 => "WARNING",
4 => "PARSE",
8 => "NOTICE",
16 => "CORE_ERROR",
32 => "CORE_WARNING",
64 => "COMPILE_ERROR",
128 => "COMPILE_WARNING",
256 => "USER_ERROR",
512 => "USER_WARNING",
1024 => "USER_NOTICE",
2048 => "STRICT",
4096 => "RECOVERABLE_ERROR",
8192 => "DEPRECATED",
16384 => "USER_DEPRECATED",
32767 => "ALL",
);
$errors2level = array (
"ERROR" => "ERROR",
"WARNING" => "WARNING",
"PARSE" => "FATAL",
"NOTICE" => "INFO",
"CORE_ERROR" => "ERROR",
"CORE_WARNING" => "WARNING",
"COMPILE_ERROR" => "ERROR",
"COMPILE_WARNING" => "WARNING",
"USER_ERROR" => "ERROR",
"USER_WARNING" => "WARNING",
"USER_NOTICE" => "INFO",
"STRICT" => "WARNING",
"RECOVERABLE_ERROR" => "WARNING",
"DEPRECATED" => "DEBUG",
"USER_DEPRECATED" => "DEBUG",
"ALL" => "ERROR",
"UNKNOWN" => "ERROR",
);
$error = (isset($errnos2error[$errno])?$errnos2error[$errno]:'UNKNOWN');
$level = (isset($errors2level[$error])?$errors2level[$error]:'ERROR');
self :: logging($level, "A PHP $error occured (#$errno) : $errstr [$errfile:$errline]");
return False;
}
/*
* Public logging methods
*/
/**
* Log a message with level DEBUG
*
* @param[in] $message The message to log
*
* @retval void
**/
public static function debug($message) {
self :: logging('DEBUG', $message);
}
/**
* Log a message with level INFO
*
* @param[in] $message The message to log
*
* @retval void
**/
public static function info($message) {
self :: logging('INFO', $message);
}
/**
* Log a message with level WARNING
*
* @param[in] $message The message to log
*
* @retval void
**/
public static function warning($message) {
self :: logging('WARNING', $message);
}
/**
* Log a message with level ERROR
*
* @param[in] $message The message to log
*
* @retval void
**/
public static function error($message) {
self :: logging('ERROR', $message);
}
/**
* Log a message with level FATAL
*
* @param[in] $message The message to log
*
* @retval void
**/
public static function fatal($message) {
self :: logging('FATAL', $message);
}
}
/**
* Error Codes
*/
LSerror :: defineError('LSlog_01',
_("LSlog : Fail to load logging handler %{handler}.")
);