<?php
set_include_path('phpFlickr/PEAR' . PATH_SEPARATOR . get_include_path());
 
define('MODE_KEYWORDS', 0x01);
define('MODE_ALL_PICS', 0x02);
define('SORRY', "This seems to happen a lot when querying Flickr. I have to figure this one out. Very sorry.");
define('FOOTER', "<br /><a href='".$_SERVER['PHP_SELF']."?mode=tags'>Take this Test with Words (Tags)</a> --- <a href='".$_SERVER['PHP_SELF']."?mode=pics'>Take this Test with Pictures Only</a><br /><br /><strong><i><a href='http://www.nextbbs.com/do_topic_id_573_post_3927'>To My Post & Source Code</i></strong></a>");
define('MAX_RETRIES', '10');
define('DB_TABLE', 'cfr_challenges');
// ++ Modify these two lines
define('DB_DSN', 'mysql://labs:labs@localhost/labs');
define('FLICKR_KEY', '749b450d27abbffe315c244d49dc6cac');
// --
 
class Captcha
{
var $debug, $mode, $seedtag, $childtag, $credits, $f;
 
        function Captcha()
        {
                // Change this line to switch modes
                $this->mode = MODE_ALL_PICS;
                if(isset($_GET['mode']) && $_GET['mode']=='tags')
                        $this->mode = MODE_KEYWORDS;
                $this->debug = 2;
                $this->credits = array();
 
                $this->challenge();
        }
 
        function log($txt)
        {
                if($this->debug>0)
                {
                        print $txt;
                        if($this->debug>1)
                        {
                                $f = fopen("/tmp/captcha.log", "a");
                                fwrite($f, $txt."
");
                                fclose($f);
                        }
                }
        }
 
        function challenge()
        {
                // Did they submit?
                if(isset($_POST['hiddenid']) && isset($_POST['hiddenf']))
                {
                        $this->processResponse(&$_POST['hiddenid'], &$_POST['hiddenf']);
                }
                else
                {
                        $this->askQuestion();
                }
        }
 
        function processResponse($id, $reply)
        {
                require_once 'DB.php';
                $db =& DB::connect(DB_DSN);
                if (PEAR::isError($db)) {
                        die($db->getMessage());
                }
                $res = $db->query("SELECT valid FROM `".DB_TABLE."` WHERE `cid`='".$id."'");
                $row = $res->fetchRow(DB_FETCHMODE_ORDERED);
                $valid = $row[0];
                $res->free();
                // Get rid of this challenge
                $db->query("DELETE FROM `".DB_TABLE."` WHERE `cid`='".$id."'");
 
                // Sort reply
                $tmp = array();
                for($i=0; $i<strlen($reply); $i++)
                        $tmp[] = $reply[$i];
                sort($tmp);
                $sortedreply = '';
                foreach($tmp as $c)
                        $sortedreply .= $c;
                //
 
                if($sortedreply == $valid)
                        print "<h1>Congratulations! You passed. You must be a human.</h1>";
                else
                        print "<h3><div style='color:red;'>Oh, I'm sorry, this is not the correct answer.</div></h3>";
 
                print FOOTER."</div>";
        }
 
        function _getPictures($args)
        {
                $bRandom = &$args['random'];
                $nKeep   = &$args['keep'];
                $nMaxSize = &$args['maxSize'];
 
                for($ctr=0; $ctr<MAX_RETRIES; $ctr++)
                {
                        if($bRandom)
                        {
                                $sortOrders = array(
                                                'date_posted_desc',
                                                'date_taken_desc',
                                                'interestingness_desc');
 
                                $sortOrderIdx = rand(0, 2);
                                $p_sort = $sortOrders[$sortOrderIdx];
 
                                $takenOrUpload = rand(0, 1);
                                $p_maxDate = $takenOrUpload == 1 ? 'max_taken_date' : 'max_upload_date';
                                $aWhileBack = time() - 182 * 24 * 60 * 60;
                                $stopAt = rand($aWhileBack, time());
                                $p_maxDateValue = date('Y-m-d H:i:s', $stopAt);
 
                                $args = 
                                        array(
                                                'license'       => '4', // Attribution License
                                                'per_page'      => $nMaxSize,
                                                'sort'          => $p_sort,
                                                $p_maxDate      => $p_maxDateValue,
                                        );
                        }
                        else
                        {
                                $seedtags = array(
                                        'cat', 'cats', 'baby', 'beach', 'dog', 'dogs', 'flower', 'flowers', 'food', 'garden', 'girl', 'graffiti', 'house',
                                        'kids', 'lake', 'mountain', 'mountains', 'park', 'rock', 'sign', 'turtle', 'snow', 'sun', 'sunset', 'tree', 'trees',
                                        'wedding', 'zoo',
                                );
 
                                $l = count($seedtags) - 1;
                                $idx = rand(0, $l);
                                $this->seedtag = $seedtags[$idx];
                                $this->log("Using Tag: ".$this->seedtag."<br />");
 
                                $this->log( "Related tags:<br>
");
                                $comma='';
 
                                $tags = $this->f->tags_getRelated($this->seedtag);
                                foreach ($tags['tag'] as $tag)
                                {
                                        $this->log($comma.$tag);
                                        $comma = ',';
                                }
                                $l = count($tags['tag']);
                                $idx = rand(0, $l) - 1;
                                $this->childtag = $tags['tag'][$idx];
                                $this->log( "Retrieving Photos with tag '".$this->seedtag."' and child tag '".$this->childtag."':<br>
");
 
                                $args = 
                                        array(
                                                "license"       => '4', // Attribution License
                                                'per_page'      => $nMaxSize,
                                                'tag_mode'      => 'all',
                                                'tags'          =>$this->seedtag.','.$this->childtag,
                                        );
                        }
 
                        $photos = $this->f->photos_search($args);
                        if(count($photos['photo']) < $nMaxSize)
                        {
                                $this->log("Error retrieving info from Flicker...retrying<br />");
                                usleep(500000);
                        }
                        else
                                break;
                }
 
                if(count($photos['photo']) < $nMaxSize)
                        die("</div><a href='".$_SERVER['PHP_SELF']."'>Not enough sample images".SORRY." Click to try again.</a>");
 
                $photosArray = array();
                while(count($photosArray)<$nKeep)
                {
                        $r = rand(0, $nMaxSize - 1);
                        if(!isset($photosArray[$r]))
                                $photosArray[$r] = true;
                }
 
                if($this->mode==MODE_ALL_PICS && !$bRandom)
                {
                        $queryArray = array();
                        while(count($queryArray)<$nKeep)
                        {
                                $r = rand(0, $nMaxSize - 1);
                                if(!isset($photosArray[$r]) && !isset($queryArray[$r]))
                                        $queryArray[$r] = true;
                        }
                }
 
                $this->log("Keeping only $nKeep pictures<br />");
 
                $runner = 0;
                foreach ($photos['photo'] as $photo)
                {
                        // Build image and link tags for each photo
                        if(isset($photosArray[$runner]))
                        {
                                $photosArray[$runner] = array('valid'=>($bRandom?false:true), 'link'=>$this->f->buildPhotoURL($photo, "Square"));
                                $this->credits .=
                                        "<a href='http://www.flickr.com/photos/$photo[owner]/$photo[id]'>" .
                                        $photo[title] .
                                        "</a><br />";
                #               $this->log($samplePhotos[$runner]);
                        }
                        else if($this->mode==MODE_ALL_PICS && isset($queryArray[$runner]))
                        {
                                $queryArray[$runner] = array('link'=>$this->f->buildPhotoURL($photo, "Square"));
                                $credits .=
                                        "<a href='http://www.flickr.com/photos/$photo[owner]/$photo[id]'>" .
                                        $photo[title] .
                                        "</a><br />";
                        }
                        $runner ++;
                }
 
                if($this->mode==MODE_ALL_PICS && !$bRandom)
                        return array($photosArray, $queryArray);
                else
                        return $photosArray;
        }
 
        function _getDecoy($prefix, $idx, $link)
        {
                // Retrieve picture from Flickr
                $this->f->req->setMethod(HTTP_REQUEST_METHOD_GET);
                $this->f->req->setURL($link);
                if(!$this->f->req->sendRequest())
                {
                        print "Error while retrieving picture from Flickr. Time out?<br /><br />";
                        return null;
                }
                $response = $this->f->req->getResponseBody();
                $fname = 'tmp/'.$prefix.$idx.'.jpg';
                $h = fopen($fname, "wb");
                fwrite($h, $response);
                fclose($h);
                return $fname;
        }
 
        function askQuestion()
        {
                require_once("phpFlickr/phpFlickr.php");
                // Create new phpFlickr object
                $this->f = new phpFlickr(FLICKR_KEY);
 
                // 1st, discover 50 random pictures
                $maxSample = 50;
                $maxValid  = 50;
 
                print <<<EOB
                <HTML>
                <BODY>
                <form id='submitform' action='{$_SERVER['PHP_SELF']}' method='post'>
                <input type="hidden" id="hiddenf" name="hiddenf" value="" />
                        <div id="kitty">
                                <style type="text/css">
                                        #kitty {
                                                text-align:center;
                                        }
                                        table.kittyauth {
                                        margin:auto;
                                                border: none;
                                                background-color:#000;<