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