Initial Import

1 files changed, 346 insertions, 0 deletions

diff --git a/system/plugins/captcha_pi.php b/system/plugins/captcha_pi.php
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+<?php  if (!defined('BASEPATH')) exit('No direct script access allowed');
+/**
+ * Code Igniter
+ *
+ * An open source application development framework for PHP 4.3.2 or newer
+ *
+ * @package		CodeIgniter
+ * @author		Rick Ellis
+ * @copyright	Copyright (c) 2006, pMachine, Inc.
+ * @license		http://www.codeignitor.com/user_guide/license.html 
+ * @link		http://www.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://www.your-site.com/captcha/',
+					'font_path'	 => './system/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://your-site.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),
+	 KEY (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://www.your-site.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_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
+	// -----------------------------------
+			
+	$im = ImageCreate($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);
+}
+
+?>
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