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<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
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/**
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* CodeIgniter
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*
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* An open source application development framework for PHP 4.3.2 or newer
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*
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* @package CodeIgniter
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* @author ExpressionEngine Dev Team
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* @copyright Copyright (c) 2008 - 2010, EllisLab, Inc.
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* @license http://codeigniter.com/user_guide/license.html
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* @link http://codeigniter.com
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* @since Version 1.0
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* @filesource
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*/
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// ------------------------------------------------------------------------
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/*
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Instructions:
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Load the plugin using:
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$this->load->plugin('captcha');
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Once loaded you can generate a captcha like this:
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$vals = array(
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'word' => 'Random word',
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'img_path' => './captcha/',
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'img_url' => 'http://example.com/captcha/',
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'font_path' => './system/fonts/texb.ttf',
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'img_width' => '150',
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'img_height' => 30,
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'expiration' => 7200
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);
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$cap = create_captcha($vals);
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echo $cap['image'];
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NOTES:
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The captcha function requires the GD image library.
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Only the img_path and img_url are required.
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If a "word" is not supplied, the function will generate a random
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ASCII string. You might put together your own word library that
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you can draw randomly from.
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If you do not specify a path to a TRUE TYPE font, the native ugly GD
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font will be used.
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The "captcha" folder must be writable (666, or 777)
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The "expiration" (in seconds) signifies how long an image will
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remain in the captcha folder before it will be deleted. The default
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is two hours.
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RETURNED DATA
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The create_captcha() function returns an associative array with this data:
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[array]
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(
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'image' => IMAGE TAG
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'time' => TIMESTAMP (in microtime)
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'word' => CAPTCHA WORD
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)
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The "image" is the actual image tag:
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<img src="http://example.com/captcha/12345.jpg" width="140" height="50" />
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The "time" is the micro timestamp used as the image name without the file
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extension. It will be a number like this: 1139612155.3422
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The "word" is the word that appears in the captcha image, which if not
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supplied to the function, will be a random string.
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ADDING A DATABASE
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In order for the captcha function to prevent someone from posting, you will need
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to add the information returned from create_captcha() function to your database.
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Then, when the data from the form is submitted by the user you will need to verify
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that the data exists in the database and has not expired.
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Here is a table prototype:
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CREATE TABLE captcha (
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captcha_id bigint(13) unsigned NOT NULL auto_increment,
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captcha_time int(10) unsigned NOT NULL,
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ip_address varchar(16) default '0' NOT NULL,
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word varchar(20) NOT NULL,
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PRIMARY KEY `captcha_id` (`captcha_id`),
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KEY `word` (`word`)
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)
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Here is an example of usage with a DB.
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On the page where the captcha will be shown you'll have something like this:
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$this->load->plugin('captcha');
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$vals = array(
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'img_path' => './captcha/',
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'img_url' => 'http://example.com/captcha/'
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);
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$cap = create_captcha($vals);
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$data = array(
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'captcha_id' => '',
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'captcha_time' => $cap['time'],
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'ip_address' => $this->input->ip_address(),
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'word' => $cap['word']
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);
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$query = $this->db->insert_string('captcha', $data);
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$this->db->query($query);
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echo 'Submit the word you see below:';
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echo $cap['image'];
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echo '<input type="text" name="captcha" value="" />';
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Then, on the page that accepts the submission you'll have something like this:
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// First, delete old captchas
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$expiration = time()-7200; // Two hour limit
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$DB->query("DELETE FROM captcha WHERE captcha_time < ".$expiration);
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// Then see if a captcha exists:
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$sql = "SELECT COUNT(*) AS count FROM captcha WHERE word = ? AND ip_address = ? AND date > ?";
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$binds = array($_POST['captcha'], $this->input->ip_address(), $expiration);
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$query = $this->db->query($sql, $binds);
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$row = $query->row();
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if ($row->count == 0)
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{
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echo "You must submit the word that appears in the image";
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}
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*/
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/**
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|==========================================================
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| Create Captcha
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|==========================================================
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*/
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function create_captcha($data = '', $img_path = '', $img_url = '', $font_path = '')
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{
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$defaults = array('word' => '', 'img_path' => '', 'img_url' => '', 'img_width' => '150', 'img_height' => '30', 'font_path' => '', 'expiration' => 7200);
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foreach ($defaults as $key => $val)
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{
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if ( ! is_array($data))
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{
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if ( ! isset($$key) OR $$key == '')
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{
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$$key = $val;
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}
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}
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else
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{
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$$key = ( ! isset($data[$key])) ? $val : $data[$key];
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}
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}
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if ($img_path == '' OR $img_url == '')
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{
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return FALSE;
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}
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if ( ! @is_dir($img_path))
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{
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return FALSE;
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}
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if ( ! is_really_writable($img_path))
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{
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return FALSE;
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}
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if ( ! extension_loaded('gd'))
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{
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return FALSE;
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}
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// -----------------------------------
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// Remove old images
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// -----------------------------------
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list($usec, $sec) = explode(" ", microtime());
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$now = ((float)$usec + (float)$sec);
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$current_dir = @opendir($img_path);
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while($filename = @readdir($current_dir))
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{
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if ($filename != "." and $filename != ".." and $filename != "index.html")
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{
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$name = str_replace(".jpg", "", $filename);
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if (($name + $expiration) < $now)
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{
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@unlink($img_path.$filename);
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}
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}
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}
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@closedir($current_dir);
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// -----------------------------------
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// Do we have a "word" yet?
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// -----------------------------------
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if ($word == '')
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{
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$pool = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
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$str = '';
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for ($i = 0; $i < 8; $i++)
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{
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$str .= substr($pool, mt_rand(0, strlen($pool) -1), 1);
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}
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$word = $str;
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}
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// -----------------------------------
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// Determine angle and position
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// -----------------------------------
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$length = strlen($word);
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$angle = ($length >= 6) ? rand(-($length-6), ($length-6)) : 0;
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$x_axis = rand(6, (360/$length)-16);
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$y_axis = ($angle >= 0 ) ? rand($img_height, $img_width) : rand(6, $img_height);
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// -----------------------------------
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// Create image
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// -----------------------------------
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// PHP.net recommends imagecreatetruecolor(), but it isn't always available
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if (function_exists('imagecreatetruecolor'))
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{
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$im = imagecreatetruecolor($img_width, $img_height);
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}
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else
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{
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$im = imagecreate($img_width, $img_height);
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}
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// -----------------------------------
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// Assign colors
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// -----------------------------------
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$bg_color = imagecolorallocate ($im, 255, 255, 255);
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$border_color = imagecolorallocate ($im, 153, 102, 102);
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$text_color = imagecolorallocate ($im, 204, 153, 153);
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$grid_color = imagecolorallocate($im, 255, 182, 182);
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$shadow_color = imagecolorallocate($im, 255, 240, 240);
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// -----------------------------------
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// Create the rectangle
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// -----------------------------------
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ImageFilledRectangle($im, 0, 0, $img_width, $img_height, $bg_color);
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// -----------------------------------
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// Create the spiral pattern
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// -----------------------------------
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$theta = 1;
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$thetac = 7;
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$radius = 16;
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$circles = 20;
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$points = 32;
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for ($i = 0; $i < ($circles * $points) - 1; $i++)
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{
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$theta = $theta + $thetac;
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$rad = $radius * ($i / $points );
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$x = ($rad * cos($theta)) + $x_axis;
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$y = ($rad * sin($theta)) + $y_axis;
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$theta = $theta + $thetac;
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$rad1 = $radius * (($i + 1) / $points);
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$x1 = ($rad1 * cos($theta)) + $x_axis;
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$y1 = ($rad1 * sin($theta )) + $y_axis;
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imageline($im, $x, $y, $x1, $y1, $grid_color);
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$theta = $theta - $thetac;
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}
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// -----------------------------------
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// Write the text
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// -----------------------------------
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$use_font = ($font_path != '' AND file_exists($font_path) AND function_exists('imagettftext')) ? TRUE : FALSE;
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if ($use_font == FALSE)
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{
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$font_size = 5;
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$x = rand(0, $img_width/($length/3));
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$y = 0;
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}
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else
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{
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$font_size = 16;
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$x = rand(0, $img_width/($length/1.5));
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$y = $font_size+2;
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}
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for ($i = 0; $i < strlen($word); $i++)
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{
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if ($use_font == FALSE)
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{
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$y = rand(0 , $img_height/2);
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imagestring($im, $font_size, $x, $y, substr($word, $i, 1), $text_color);
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$x += ($font_size*2);
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}
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else
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{
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$y = rand($img_height/2, $img_height-3);
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imagettftext($im, $font_size, $angle, $x, $y, $text_color, $font_path, substr($word, $i, 1));
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$x += $font_size;
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}
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}
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// -----------------------------------
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// Create the border
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// -----------------------------------
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imagerectangle($im, 0, 0, $img_width-1, $img_height-1, $border_color);
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// -----------------------------------
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// Generate the image
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// -----------------------------------
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$img_name = $now.'.jpg';
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ImageJPEG($im, $img_path.$img_name);
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$img = "<img src=\"$img_url$img_name\" width=\"$img_width\" height=\"$img_height\" style=\"border:0;\" alt=\" \" />";
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ImageDestroy($im);
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return array('word' => $word, 'time' => $now, 'image' => $img);
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}
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/* End of file captcha_pi.php */
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/* Location: ./system/plugins/captcha_pi.php */
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