<?php

/* 
     log.class.php
     by dabu@centrum.cz
     http://dabu.dhs.org/
     
     simple logging class
     
     logs: date, ip, script name, additional text
     additional: display_log(), does not log duplicate entries 
       within $toler seconds, resolves real ip for proxies
     usability: to log php access to phpscipt or events by client
     notice: make sure that $log_file has write privilege for webserver
  
     example:
     $l = new simplelog;
     $l->entry();
     $l->display_log();
*/   

  class simplelog {
    
    var $notify = 1;
    var $notify_mail = 'hernan@bottaingenieria.com.ar';
    var $from = 'logacceso@bottaingenieria.com.ar';
    var $notify_mail_subj = 'Log de acceso';

    var $log_file = '.access.log';
    var $toler = 120;
   
    var $ip;
    var $xcache;
    var $date;
    var $page;
    var $text;
    var $dolog = false;
  
    // inicializace
    function simplelog() {
      if ($_SERVER["HTTP_X_FORWARDED_FOR"]) {
        $this->ip = gethostbyaddr($_SERVER["HTTP_X_FORWARDED_FOR"]);
        $this->xcache = gethostbyaddr($_SERVER["REMOTE_ADDR"]);
      }
      else {
        $this->ip = gethostbyaddr($_SERVER["REMOTE_ADDR"]);
        $this->xcache = '';
      }  
      $this->date = date("d.m.Y H:i:s");
      $this->page = $_SERVER["SCRIPT_NAME"];
      $this->text = "";
      $this->dolog = 1;
    }
    
    // zobrazi log
    function display_log() {
      echo ("<FONT size=1><b>Access log:</b><br>");
      $fp=@fopen($this->log_file, "r");
      if ($fp) {
        while ($buf=fgets($fp,4096)) {
          echo chop($buf)."<br>";
        }  
        fclose($fp);
      }
      echo ("</FONT>");
    }
  
    // test jestli v logu neni zpetne ($toler sekund) stejny IP
    function check_entry() {
      if (file_exists($this->log_file)) {
        $fp=@fopen($this->log_file, "r");
        if ($this->xcache) $logtext = "(x: ".$this->xcache.") ".$this->text;
        else $logtext = $this->text;
        if ($fp) {
          while ($buf=fgets($fp,4096)) {
            if (strlen($buf)>3) {
              // extrahuje casti dat cas ip 
              preg_match("/^([0-9.]+) ([0-9:]+) ([-a-z0-9.]*) ([^ ]*) ?(.*)\n$/i", $buf, $ret);
              //jde o stejneho navstevnika ?        
              if (($ret[3] == $this->ip) && ($ret[5] == $logtext)) { 
                $fnd=1;
                $dif=0;  
                $oldts = strtotime(substr($ret[1],6,4).'-'.substr($ret[1],3,2).'-'.substr($ret[1],0,2).' '.$ret[2]);
                // hledam nejmensi diferenci mezi posledni navstevou a nynejsi navstevou
                if ( $dif < (time() - $oldts) ) { $dif = time() - $oldts; } 
              }
            }
          }
          fclose($fp);
        }
        // logovat pouze pokud tu byl pred vice jak $toler sekundama
        if ($fnd && !($dif > $this->toler)) { $this->dolog = 0; }
        else { $this->dolog = 1; }
      }
    }
  
    // podminecny zalogovani do fajle (IP tu bylo recently?)
    function entry() {
      $this->check_entry();
      if ($this->dolog) $this->write_log();
    }

    // bezpodminecny zalogovani do fajle 
    function write_log() {
      if ($this->xcache) $logtext = "(x: ".$this->xcache.") ".$this->text;
      else $logtext = $this->text;
      $fp=@fopen($this->log_file, "a+");
      if ($fp) {
        fputs($fp,$this->date." ".$this->ip." ".$this->page." ".$logtext."\n");
        fclose($fp);
      }  
	
	$script = "http://". $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];  
	$script = $script . "/../" .  $this->log_file ;  

      if ($this->notify) {
        @mail($this->notify_mail, $this->notify_mail_subj, $this->date."\n".$this->ip."\n".$script."\n".$logtext, "From: $from");
      }
    } 
  
  } 


?>