121 lines
3.7 KiB
PHP
121 lines
3.7 KiB
PHP
<?php
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if(!defined('ONYX')) exit;
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$_ONYX_OPT_CAPTCHA = $OPT;
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class Captcha
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{
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static function check($entry)
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{
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$SESS = new Session();
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return isset($SESS->values["_captcha"]) && $SESS->values["_captcha"] == strtolower($entry);
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}
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private static function genImg()
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{
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global $_ONYX_OPT_CAPTCHA;
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$SESS = new Session();
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//Création de l'image à partir d'un fond
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$_img = imagecreate($_ONYX_OPT_CAPTCHA["sizeX"], $_ONYX_OPT_CAPTCHA["sizeY"]);
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imagefilledrectangle($_img, 0, 0, $_ONYX_OPT_CAPTCHA["sizeX"], $_ONYX_OPT_CAPTCHA["sizeY"], imagecolorallocate($_img, $_ONYX_OPT_CAPTCHA["back"]["red"], $_ONYX_OPT_CAPTCHA["back"]["green"], $_ONYX_OPT_CAPTCHA["back"]["blue"]));
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//Définition de la liste des caractères
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if (empty($_ONYX_OPT_CAPTCHA["caracteres"]))
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$caracteres = "2345678azertypsdfhjkmwxcbn";
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else
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$caracteres = $_ONYX_OPT_CAPTCHA["caracteres"];
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$nb_caracteres = strlen($caracteres) - 1;
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//On récupère tous les fichiers de polices
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if (empty($_ONYX_OPT_CAPTCHA["fonts_dir"]))
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$fontsDir = ONYX."modules/captcha/fonts";
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else
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$fontsDir = ONYX.$_ONYX_OPT_CAPTCHA["fonts_dir"];
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$fonts = glob($fontsDir."/*.ttf");
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$nb_fonts = count($fonts) - 1;
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//On définit des couleurs
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if (empty($_ONYX_OPT_CAPTCHA["colors"]) || !is_array($_ONYX_OPT_CAPTCHA["colors"]))
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$colors = array(
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imagecolorallocate($_img, rand(250,225), rand(0,25), rand(0,25)),
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imagecolorallocate($_img, rand(0,25), rand(250,225), rand(0,25)),
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imagecolorallocate($_img, rand(0,55), rand(0,55), rand(250,255)),
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imagecolorallocate($_img, rand(0,25), rand(250,225), rand(250,225)),
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imagecolorallocate($_img, rand(250,225), rand(0,25), rand(250,225)),
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imagecolorallocate($_img, rand(250,225), rand(250,225), rand(0,25)),
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//imagecolorallocate($_img, rand(200,225), rand(200,225), rand(200,225))
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imagecolorallocate($_img, rand(0,55), rand(0,55), rand(0,55))
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);
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else
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$colors = $_ONYX_OPT_CAPTCHA["colors"];
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$nb_colors = count($colors) - 1;
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//On définit la couleur de fond
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$arriere_plan = imagecolorallocatealpha($_img, 0, mt_rand(0,255), 0, 127);
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$SESS->values["_captcha"] = "";
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$dist = $_ONYX_OPT_CAPTCHA["sizeX"] / $_ONYX_OPT_CAPTCHA["nb_carac"];
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$dist2 = $dist / 2;
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$dist4 = $dist2 / 2;
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$height2 = $_ONYX_OPT_CAPTCHA["sizeY"] / 2;
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$height4 = $height2 / 2;
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//Si la configuration indique un fichier contenant des mots, on l'utilise
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if (!empty($_ONYX_OPT_CAPTCHA["mots"]) && is_readable(ONYX."modules/captcha/".$_ONYX_OPT_CAPTCHA["mots"]))
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{
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$mot = file(ONYX."modules/captcha/".$_ONYX_OPT_CAPTCHA["mots"], FILE_IGNORE_NEW_LINES|FILE_SKIP_EMPTY_LINES);
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$mot = $mot[mt_rand(0, count($mot) - 1)];
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}
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//Création du captcha en lui-même
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for($i = 0; $i < $_ONYX_OPT_CAPTCHA["nb_carac"]; $i++)
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{
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if (empty($mot) || empty($mot[$i]))
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{
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if (mt_rand(0,2) == 1)
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$char = strtoupper($caracteres[mt_rand(0, $nb_caracteres)]);
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else
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$char = $caracteres[mt_rand(0, $nb_caracteres)];
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}
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else
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$char = $mot[$i];
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ImageTTFText($_img, mt_rand(14,23), mt_rand(-17, 20), $i * $dist + mt_rand(0,$dist2), mt_rand(0, $height4) + $height2, $colors[mt_rand(0, $nb_colors)], $fonts[mt_rand(0, $nb_fonts)], $char);
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$SESS->values["_captcha"] .= strtolower($char);
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}
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$SESS->put();
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return $_img;
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}
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static function newCaptcha()
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{
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ob_start();
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imagepng(Captcha::genImg());
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return base64_encode(ob_get_clean());
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}
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static function _debug()
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{
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return base64_decode(Captcha::newCaptcha());
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}
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static function printNewCaptcha()
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{
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print "data:image/png;base64,".Captcha::newCaptcha();
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}
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static function showNewCaptcha()
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{
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header ("Content-type: image/png");
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imagepng($_img = Captcha::genImg());
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imagedestroy($_img);
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}
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}
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?>
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