PHPeter
Smarty n00b
Joined: 18 Mar 2011
Posts: 3
Location: The Netherlands
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 Posted: Sat Mar 19, 2011 5:24 pm Post subject: Captcha Plugin |
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There are a lot of different Captcha-scripts available, i wrote one as a Smarty-plugin. Just add the script to the plugins-folder.
SYNOPSIS:
index.tpl
---------
Required parameters:
-width (px, int)
-height (px, int)
-font (font.ttf)
-fontsize (int)
-font_x (int, x-position first captcha character)
-font_y (int, y-position first captcha character)
-length (int, number of characters to display in the captcha-image)
Allowed parameters:
-color (Captcha characters color, Hex, example: FFCC00, default FFFFFF)
-shadow (Captcha characters shadow-color, Hex, default 888888)
-background (Captcha background color, Hex, default 000000)
-random_angle (Captchatext in random angle, bool, default false)
-cssclass (class-statement for img-tag, string)
-alttext (alt-statement for img-tag, string)
-font_dir (dir where the font.tff is stored, default = SMARTY_DIR . “font/”)
-session_name (Session-key where md5(captcha-key) is stored, default = "captcha")
Example required tags:
{captcha width="250" height="220" font="RomanStonecut.ttf" fontsize="35" font_x="5" font_y="115" length="7"}
Example all tags:
{captcha width="250" height="220" font="RomanStonecut.ttf" fontsize="35" font_x="5" font_y="115" length="7" color="FF0000" shadow="00FF00" background="EEEEEE" alttext="Captcha image" random_angle=true font_dir=”home/users/anotherfolder/font/” session_name=”captcha_in_md5”}
The script can be downloaded at pastebin.com/g9UambkK
| Code: | <?php
/**
* Smarty plugin
* @package Smarty
* @subpackage plugins
*/
/**
* Smarty {captcha} function plugin
*
* Type: function<br>
* Name: captcha<br>
* Purpose: Display captcha-images in webpages
* @author PHPeter.eu
* @link http://www.phpeter.eu/
* @param array
* @return string
*/
function smarty_function_captcha_setcaptcha($length, $sessname){
$chars = '23456789ABCDEFGHJKMNPQRSTVWXYZ';
$code = '';
$i = 0;
while ($i < $length) {
$code .= substr($chars, mt_rand(0, strlen($chars)-1), 1);
$i++;
}
$_SESSION[$sessname] = md5($code);
return $code;
}
function smarty_function_captcha_verify($plugin='', $param_model, $params) {
foreach(array('requires', 'allowed', 'deprecated') as $category) {
if (!array_key_exists($category, $param_model)) {
$param_model[$category] = array();
}
}
$_missing = array_diff(array_keys($param_model['requires']), array_keys($params));
if (!empty($_missing)) {
throw new SmartyException("[$plugin] missing required parameter(s) for ".join(', ', $_missing), E_USER_NOTICE);
}
foreach ($param_model['requires'] as $field=>$type) {
if (array_key_exists($field, $params) && !empty($params[$field])) {
$_params[$field] = $params[$field];
}
else{
throw new SmartyException("[$plugin] supplied parameter unknown for ".$field." = ".$params[$field], E_USER_NOTICE);
}
}
foreach ($param_model['allowed'] as $field=>$type) {
if (array_key_exists($field, $params) && isset($params[$field])) {
$_params[$field] = $params[$field];
}
}
foreach ($param_model['deprecated'] as $field=>$type) {
if (array_key_exists($field, $params)) {
throw new SmartyException("[$plugin] deprecated parameter '$field'", E_USER_NOTICE);
$_params[$field] = $params[$field];
}
}
return $_params;
}
function smarty_function_captcha($params){
$_params = smarty_function_captcha_verify(
'captcha'
, array(
'requires' => array(
'width' => 'int',
'height' => 'int',
'font' => 'string',
'fontsize' => 'int',
'font_x' => 'int',
'font_y' => 'int',
'length' => 'int'
)
, 'allowed' => array(
'color' => 'hex',
'background' => 'hex',
'shadow' => 'hex',
'random_angle' => 'bool',
'cssclass' => 'string',
'alttext' => 'string',
'font_dir' => 'string',
'session_name' => 'string'
)
, 'deprecated' => array(
)
)
, $params
);
$atags = array();
foreach ($_params as $field=>$value) {
switch($field){
case "font":
$font = $value;
break;
case "font_dir":
define('SMARTY_FONT_DIR', $value . DS);
break;
case "fontsize":
if(is_int((int)$value)){
$size = (int)$value;
}
break;
case "font_x":
if(is_int((int)$value)){
$fontx = (int)$value;
}
break;
case "font_y":
if(is_int((int)$value)){
$fonty = (int)$value;
}
break;
case "width":
if(is_int((int)$value)){
$width = (int)$value;
}
$atags[] = 'width="'.$value.'"';
break;
case "height":
if(is_int((int)$value)){
$height = (int)$value;
}
$atags[] = 'height="'.$value.'"';
break;
case "length":
if(is_int((int)$value) && $value >= 1){
$length = (int)$value;
}
else{
$length = 6;
}
break;
case "color":
if(strlen($value) != 6){
throw new SmartyException("[$plugin] wrong value for '$field'", E_USER_NOTICE);
}
else{
$color_red = hexdec(substr($value, 0, 2));
$color_green = hexdec(substr($value, 2, 2));
$color_blue = hexdec(substr($value, 4, 2));
}
break;
case "shadow":
if(strlen($value) != 6){
throw new SmartyException("[$plugin] wrong value for '$field'", E_USER_NOTICE);
}
else{
$shadow_red = hexdec(substr($value, 0, 2));
$shadow_green = hexdec(substr($value, 2, 2));
$shadow_blue = hexdec(substr($value, 4, 2));
}
break;
case "background":
if(strlen($value) != 6){
throw new SmartyException("[$plugin] wrong value for '$field'", E_USER_NOTICE);
}
else{
$back_red = hexdec(substr($value, 0, 2));
$back_green = hexdec(substr($value, 2, 2));
$back_blue = hexdec(substr($value, 4, 2));
}
break;
case "random_angle":
if(is_bool($value)){
$rand_angle = $value;
}
else{
$rand_angle = false;
}
if($rand_angle == true){
$angle = (rand(0,50) - 25);
}
else{
$angle = 0;
}
break;
case "cssclass":
$atags[] = 'class="'.$value.'"';
break;
case "alttext":
$atags[] = 'alt="'.$value.'"';
break;
case "session_name":
$sessionname = $value;
break;
default:
throw new SmartyException("[$plugin] unknown parameter '$field'", E_USER_NOTICE);
break;
}
}
if(!isset($sessionname) || strip($sessionname) == ""){
$sessionname = "captcha";
}
$captcha = smarty_function_captcha_setcaptcha($length, $sessionname);
if(!isset($angle) || !is_numeric($angle) || $angle > 25 || $angle < -25){
$angle = 0;
}
$stags = implode(" ", $atags);
if(!isset($color_red)){
$color_red = 255;
$color_green = 255;
$color_blue = 255;
}
if(!isset($shadow_red)){
$shadow_red = 128;
$shadow_green = 128;
$shadow_blue = 128;
}
if(!isset($back_red)){
$back_red = 0;
$back_green = 0;
$back_blue = 0;
}
if (!defined('SMARTY_FONT_DIR')) {
define('SMARTY_FONT_DIR', SMARTY_DIR . 'font' . DS);
}
$im = imagecreatetruecolor($width, $height);
$font_captcha_col = imagecolorallocate($im, $color_red, $color_green, $color_blue);
$shadow_captcha = imagecolorallocate($im, $shadow_red, $shadow_green, $shadow_blue);
$background_captcha = imagecolorallocate($im, $back_red, $back_green, $back_blue);
imagefilledrectangle($im, 0, 0, $width, $height, $background_captcha);
$font = SMARTY_FONT_DIR . $font;
imagettftext($im, $size, $angle, $fontx, $fonty, $shadow_captcha, $font, $captcha);
imagettftext($im, $size, $angle, ($fontx + 5), ($fonty + 8), $font_captcha_col, $font, $captcha);
ob_start();
imagegif($im);
imagedestroy($im);
$cap_img_str = ob_get_clean();
$cap_img_crypt = base64_encode($cap_img_str);
return "<img src=\"data:image/gif;base64,".$cap_img_crypt."\" ".$stags." />";
}
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