<?PHP
/**
* @desc as_snipercaptcha.php :
* Another CAPTCHA engine for anti-BOT site protecting.
* It doesn't use any graphic libraries (like GDI) for generating image "on the fly".
* Instead it uses Javascript and DHTML to show "aiming" grid, where user must click on some cells.
* @Author Alexander Selifonov <as-works [at] narod.ru> <alex [at] selifan.ru>
* @link http://www.selifan.ru/phpfiles.php
* @Copyright Alexander Selifonov 2008 , under GPL license
* @Version 1.03.007
* Last modified: 10.12.2008
*/
if(!defined('IMGPATH')) define('IMGPATH','');
class CSniperCaptcha {
var $serverscript = '';
var $codelen = 4; # how many user clicks in test sequence
var $idlist = ''; # string with all random generated id's for sniper grid
var $x_len = 0; # grid dimensions
var $y_len = 0;
var $cellsize;
var $var_curpos = 0; # entered 'numbers' counter
var $prevcode = -1;
var $startx = 0;
var $starty = 0;
var $accumulated = '';
var $useranswer = '';
var $submitbutton_id = '';
var $jscodepassed = '';
var $jscodefailed = '';
var $b_buffered = false;
var $reinit_action = false;
/**
* @desc CSniperCaptcha constructor
* @param int/string - pass code length (how many times user should point & click on the grid
* @param string - ID of 'submit' form button. It'll become enabled whrn all code "entered"
* @param string - javascript function name, that will be fired instantly on last user click,
* if code correct (CAPTCHA test passed)
* @param string - this function will call if test failed
* @param mixed $reinit activates captcha re-init feature
*/
function CSniperCaptcha($codelen=4, $submitid='', $jscode_success='',$jscode_fail='',$reinit=false) {
$this->codelen = $codelen;
$this->submitbutton_id = $submitid;
$this->serverscript = $_SERVER['PHP_SELF'];
$this->jscodepassed = $jscode_success;
$this->jscodefailed = $jscode_fail;
$this->reinit_action = $reinit;
if(!isset($_SESSION)) @session_start();
}
/**
* @desc all output will be redirected to returned var, no immediate echo
*/
function SetBufferedOutput($buffered=true) { $this->b_buffered = $buffered; }
/**
* @desc echoes STYLE ref to a CSS file with styles needed by CAPTCHA, and ref to the common func. js file.
*/
function DrawRefs($csspath='',$jspath='') {
$ret = '';
if($csspath!==false) $ret .="<link rel=\"stylesheet\" type=\"text/css\" href=\"{$csspath}captcha_styles.css\" >\n";
if($jspath!==false) $ret .="<SCRIPT SRC=\"{$jspath}as_jsfunclib.js\" type=\"text/javascript\"></SCRIPT>\n";
if(isset($this) && $this->b_buffered) return $ret;
echo $ret;
}
# SetServerScript: sets backend server script URI
function SetServerScript($uri) { $this->serverscript = $uri; }
function Draw($width=0, $height=0, $cellsize=0, $tovar=0) {
global $sitestrings;
$gen = array();
$jsdigvar = '0';
$ret = '';
$x_len = ($width)? $width: intval(mt_rand(4,10));
$y_len = ($height)? $height : intval(mt_rand(3,6));
$this->cellsize = array(0,0);
if(empty($cellsize) || $cellsize<=8) {
$this->cellsize[1] = round(mt_rand(10,20));
$this->cellsize[0] = round(mt_rand($this->cellsize[1],$this->cellsize[1]+10));
}
else $this->cellsize = array($cellsize,$cellsize);
$ret.="<table border='0' cellspacing='1' cellpadding='0' id='captchaTable'>";
$this->idlist = 'xxx';
$init_prompt = isset($sitestrings['captcha_init'])? $sitestrings['captcha_init'] : '';
for($y=1;$y<=$y_len;$y++) {
$ret.="<tr>";
for($x=1;$x<=$x_len;$x++) {
$cellid = chr(intval(mt_rand(97,122))).chr(intval(mt_rand(97,122))).chr(intval(mt_rand(97,122))).$y.$x;
$this->idlist .= '|'.$cellid;
$ret.= "<td id='$cellid' onClick=\"return CaptchOneShot(this)\" class=\"captcha_cell\" style=\"cursor:hand\"
onMouseOver='this.className=\"captcha_cellmo\"' onMouseOut='this.className=\"captcha_cell\"'><img src='".IMGPATH."empty.gif' width={$this->cellsize[0]} height={$this->cellsize[1]}/></td>";
}
# if needed, draw 'initialize' button, to start captcha from very beginning
if($y==1 && ($this->reinit_action)) $ret .="<td rowspan=\"$y_len\" valign=top><a href=\"javascript://\" onclick=\"CaptchaReinit(true)\"><img src=\"".IMGPATH."captcha_init.gif\" width=16 height=16 border=0 />$init_prompt</a></td>";
$ret.= "</tr>";
}
$ret .= "<tr><td colspan='$x_len' class='captcha_cell' style='text-align:left'><img id='caprogress' src='".IMGPATH."cap_progress.png' width='1' height='8' /></td></tr>";
$ret.= "</table><img id='cap_sight' src='".IMGPATH."captchasight.png' width=7 height=7 style='z-index:10; position:absolute; display:none;' />";
$_SESSION['captcha_idlist'] = $this->idlist;
$_SESSION['captcha_lenx'] = $x_len;
$_SESSION['captcha_leny'] = $y_len;
$_SESSION['captcha_cellsize'] = $this->cellsize;
$_SESSION['captcha_codelen'] = $this->codelen;
$_SESSION['captcha_accumulated'] = $_SESSION['captcha_useranswer'] = 'xxx';
$this->var_curpos = $_SESSION['captcha_curpos'] = 0;
$this->prevcode = $_SESSION['captcha_prevcode'] = -1;
if(($tovar) || ($this->b_buffered)) return $ret;
echo $ret;
} # Draw() end
/**
* @desc DrawJsCode() prints all needed javascript code for CAPTCHA processing
* @param integer/boolean if non-empty, CAPTCHA client-server exchange sequence will start immediately
*/
function DrawJsCode($autostart=1) {
$ret ="
<script language=\"JavaScript\" type=\"text/javascript\">
<!--
var busyxml = false;
var handlerurl = \"{$this->serverscript}\";
var captable = false;
var finished = 0;
var as_resize_handled=false;
var as_captcha_tmer = null;
function CaptchaReinit(evt) {
cap_imgobj=0;".(!empty($this->submitbutton_id)?"asGetObj('{$this->submitbutton_id}').disabled=true;":'')."
SendCaptchaChecking(0);
".(is_string($this->reinit_action)? "if(evt){ {$this->reinit_action} }":'')."
}
function CaptchaResizing() {
if(finished>=500) return;
if(as_captcha_tmer!=null) try { clearTimeout(as_captcha_tmer); as_captcha_tmer=null;} catch(e){};
as_captcha_tmer=setTimeout(\"CaptchaResized()\",300);
}
var rz_cnt = 0;
function CaptchaResized() {
as_captcha_tmer=null;
CaptchaReinit();
}
function SendCaptchaChecking(obj) {
// alert(typeof(obj));
if(busyxml) return false;
if(typeof(obj)!=\"string\") {
captable = asGetObj('captchaTable');
txy = getPosition(captable);
params = \"sniper_capaction=coord&tx=\"+txy[0]+\"&ty=\"+txy[1];
if(!as_resize_handled) {
window.onresize = CaptchaResizing;
as_resize_handled=true;
}
}
else {
params = \"sniper_capaction=donext&oid=\"+obj;
}
var xmlreq = NewXMLHttpRequest();
if(!xmlreq) { return false; }
xmlbusy=true;
xmlreq.onreadystatechange= function() {
if (xmlreq.readyState == 4) {
var sresponse= xmlreq.responseText;
delete xmlreq;
xmlbusy = false;
var spl = sresponse.split('|');
if(spl.length<2) { alert(\"undefined server response: \"+sresponse); return false; }
finished = spl[0]-0;
if(spl[0]=='err') {
alert('Captcha error!'); finished=200; return false;
}
var imgprogress= asGetObj('caprogress');
imgprogress.style.width = spl[0]+'%';
if(spl[0]=='100') {
finished = (spl[1]==\"yes\")?500:0;
MoveSight(-1,-1,0);\n";
if($this->submitbutton_id !='') $ret.=" if(spl[1]==\"yes\") asGetObj(\"{$this->submitbutton_id}\").disabled=false;\n";
if(!empty($this->jscodepassed)) $ret.=" if(spl[1]==\"yes\") { {$this->jscodepassed} }\n";
if(!empty($this->jscodefailed)) $ret.=" if(spl[1]==\"no\") { {$this->jscodefailed} }\n";
$ret .="
}
else {
nextx = spl[1]-0;
nexty = spl[2]-0;
MoveSight(nextx,nexty,1);
}
}
}
xmlreq.open(\"POST\",handlerurl,true);
xmlreq.setRequestHeader(\"Content-Type\",postcont);
xmlreq.send(params);
return false;
}
function getPosition(oElement) {
var ret = [0,0];
while( oElement != null ) {
ret[0] +=oElement.offsetLeft;
ret[1] +=oElement.offsetTop;
oElement = oElement.offsetParent;
}
return ret;
}
var cap_imgobj = 0;
var htimer = false;
var imgOpacity = -1;
var capimg_nextpos = [];
function MoveSight(to_x,to_y, slowly) {
if(cap_imgobj==0) {
cap_imgobj = asGetObj('cap_sight');
cap_imgobj.style.display='';
}
if(to_x<0) cap_imgobj.style.display='none'; // clicking finish
else {
if(finished>0) {
capimg_nextpos = [to_x,to_y];
cap_imgobj.capacity = imgOpacity = 100;
htimer = setInterval(\"CapFadeOutEvt()\",50);
}
else {
cap_imgobj.style.top = to_y+\"px\";
cap_imgobj.style.left = to_x+\"px\";
}
}
}
function CaptchOneShot(obj) {
if(finished>=100) return false;
var tagid = obj.getAttribute(\"id\");
SendCaptchaChecking(tagid);
}
function CapFadeOutEvt() {
cap_imgobj.opacity = imgOpacity = imgOpacity-20;
if (document.all) cap_imgobj.style.filter = 'alpha(opacity=' + imgOpacity+')';
if(imgOpacity<=10) {
clearTimeout(htimer);
cap_imgobj.style.left = capimg_nextpos[0]+'px';
cap_imgobj.style.top = capimg_nextpos[1]+'px';
// alert(cap_imgobj+' style.left= '+typeof(cap_imgobj.style.left)+' '+cap_imgobj.style.left+' '+cap_imgobj.style.top);
htimer = setInterval(\"CapFadeInEvt()\",50);
}
}
function CapFadeInEvt() {
cap_imgobj.opacity = imgOpacity = imgOpacity+20;
if (document.all) cap_imgobj.style.filter = 'alpha(opacity=' + imgOpacity+')';
if(imgOpacity>=100) {
clearTimeout(htimer);
}
}
function setOpacity (imgid, step, delay) {
if (document.all) img.style.filter = 'alpha(opacity = ' + img.opacity + ')';
}";
if($autostart) $ret .="\nSendCaptchaChecking();\n";
$ret .="//-->\n</script>\n";
if($this->b_buffered) return $ret;
echo $ret;
} # DrawJsCode end
/**
* @desc handle AJAX call from client. Generates and sends next sight position
*/
function HandleClientRequest() {
$ret = '100';
$this->idlist = isset($_SESSION['captcha_idlist'])? $_SESSION['captcha_idlist']: '';
$this->x_len = isset($_SESSION['captcha_lenx'])? $_SESSION['captcha_lenx']: 0;
$this->y_len = isset($_SESSION['captcha_leny'])? $_SESSION['captcha_leny']: 0;
$this->codelen = isset($_SESSION['captcha_codelen'])? $_SESSION['captcha_codelen']: 0;
$this->var_curpos = isset($_SESSION['captcha_curpos'])? $_SESSION['captcha_curpos']: 0;
$this->prevcode = isset($_SESSION['captcha_prevcode'])? $_SESSION['captcha_prevcode']: -1;
$this->startx = isset($_SESSION['captcha_startx'])?$_SESSION['captcha_startx']:0;
$this->starty = isset($_SESSION['captcha_starty'])?$_SESSION['captcha_starty']:0;
$this->cellsize = isset($_SESSION['captcha_cellsize'])?$_SESSION['captcha_cellsize']: array(10,10);
$this->accumulated = isset($_SESSION['captcha_accumulated'])?$_SESSION['captcha_accumulated']:'xxx';
$this->useranswer = isset($_SESSION['captcha_useranswer'])?$_SESSION['captcha_useranswer']:'xxx';
if(empty($this->idlist) || empty($this->x_len) || empty($this->y_len)) { echo 'err'; exit; } # Wrong call. May be no session support
if($_POST['sniper_capaction']==='coord') {# initial coords passed tx=NNN ty=MMM
$_SESSION['captcha_startx'] = $this->startx = isset($_POST['tx'])?$_POST['tx']:0;
$_SESSION['captcha_starty'] = $this->starty = isset($_POST['ty'])?$_POST['ty']:0;
$this->var_curpos = $_SESSION['captcha_curpos'] = 0;
$this->accumulated = $_SESSION['captcha_accumulated']=$this->useranswer = $_SESSION['captcha_useranswer']='xxx';
}
if(!empty($_POST['oid'])) {
$_SESSION['captcha_useranswer'] = $this->useranswer = $this->useranswer.'|'.$_POST['oid'];
}
$percent = intval(100*$this->var_curpos/$this->codelen); # progress bar width, NN%
$ret = '';
$this->var_curpos++;
if($percent<100) {
$nextcode = $this->prevcode;
while($nextcode == $this->prevcode) $nextcode = intval(mt_rand(0,($this->x_len*$this->y_len)-1));
$this->prevcode = $nextcode;
$idarr = explode('|',$this->idlist);
$this->accumulated .= '|'.$idarr[$nextcode+1];
$row_y = floor($nextcode/$this->x_len);
$row_x = fmod($nextcode,$this->x_len);
$next_posx = 2 + $this->startx+($row_x*($this->cellsize[0]+3));
$next_posy = 2 + $this->starty+($row_y*($this->cellsize[1]+3));
$_SESSION['captcha_curpos'] = $this->var_curpos;
$_SESSION['captcha_prevcode'] = $this->prevcode;
$_SESSION['captcha_accumulated'] = $this->accumulated;
$ret = "$percent|$next_posx|$next_posy";
}
else $ret = "$percent|".($this->useranswer===$this->accumulated ? 'yes':'no');
echo $ret; #AJAX server response
exit;
} # HandleClientRequest() end
/**
* @desc CheckPassed compares code passed from client POST with SESSION saved.
* @Return true if codes match.
*/
function CheckPassed() {
$this->accumulated = isset($_SESSION['captcha_accumulated'])?$_SESSION['captcha_accumulated']:'';
$this->useranswer = isset($_SESSION['captcha_useranswer'])?$_SESSION['captcha_useranswer']:'';
if(empty($this->accumulated)) return false;
return ($this->accumulated===$this->useranswer);
}
} # class definition End
if(!empty($_POST['sniper_capaction'])) {
$captcha_handler = new CSniperCaptcha();
$captcha_handler->HandleClientRequest();
}
?>
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