Codice PHP:
<?php
/*********************************
Securimage 0.3
Portable Security Image Script
Author: Drew Phillips
[url]www.neoprogrammers.com[/url]
Copyright 2005 Drew Phillips
********************************/
class securimage {
//USER CONFIGURATION OF IMAGE
//See included README.txt for detailed descriptions
var $image_width = 230;
//heigh of security image
var $image_height = 40;
//width of security image
var $code_length = 7;
//how many letters in the code
var $ttf_file = "elephant.ttf";
//path to ttf font to use
var $font_size = 20;
//size of the font
var $text_angle_minimum = -20;
//minimum angle in degress of letter. counter-clockwise direction
var $text_angle_maximum = 20;
//maximum angle in degrees of letter. clockwise direction
var $text_x_start = 9;
//position (in pixels) on the x axis where text starts
var $text_minimum_distance = 30;
//the shortest distance in pixels letters can be from eachother (a very small value will cause overlapping)
var $text_maximum_distance = 33;
//the longest distance in pixels letters can be from eachother
var $image_bg_color = array("red" => 255, "green" => 255, "blue" => 255);
//images background color. set each red, green, and blue to a 0-255 value
var $text_color = array("red" => 250, "green" => 0, "blue" => 56);
//the color of the text
var $shadow_text = false;
//draw a shadow for the text (gives a 3d raised bolder effect)
var $use_transparent_text = true;
//true for the ability to use transparent text, false for normal text
var $text_transparency_percentage = 15;
//0 to 100, 0 being completely opaque, 100 being completely transparent
var $draw_lines = TRUE;
//set to true to draw horizontal and vertical lines on the image
//the following 3 options will have no effect if this is set to false
var $line_color = array("red" => 204, "green" =>204, "blue" => 255);
//color of the horizontal and vertical lines through the image
var $line_distance = 12;
//distance in pixels the lines will be from eachother.
//the smaller the value, the more "cramped" the lines will be, potentially making
//the text harder to read for people
var $draw_angled_lines = TRUE;
//set to true to draw lines at 45 and -45 degree angles over the image (makes x's)
var $draw_lines_over_text = true;
//set to true to draw the lines on top of the text, otherwise the text will be on the lines
var $data_directory = "./image_data";
//path of directory to store code data in. make sure this is either outside of the webroot or unreadable
var $prune_minimum_age = 15;
//age (in minutes) of files containing unused codes to be deleted
var $hash_salt = "fg7hg3yg3fd90oi4i";
//set this to a unique string, this prevents users guessing filenames and make data more secure
//END USER CONFIGURATION
//There should be no need to edit below unless you really know what you are doing
var $im;
var $bgimg;
var $code;
var $code_entered;
var $correct_code;
function show($background_image = "")
{
if($background_image != "" && is_readable($background_image)) {
$this->bgimg = $background_image;
}
$this->doImage();
}
function prune()
{
$this->pruneOld();
}
function check($code)
{
$this->code_entered = $code;
$this->validate();
return $this->correct_code;
}
function doImage()
{
if($this->use_transparent_text == TRUE || $this->bgimg != "") {
$this->im = imagecreatetruecolor($this->image_width, $this->image_height);
$bgcolor = imagecolorallocate($this->im, $this->image_bg_color['red'], $this->image_bg_color['green'], $this->image_bg_color['blue']);
imagefilledrectangle($this->im, 0, 0, imagesx($this->im), imagesy($this->im), $bgcolor);
} else { //no transparency
$this->im = imagecreate($this->image_width, $this->image_height);
$bgcolor = imagecolorallocate($this->im, $this->image_bg_color['red'], $this->image_bg_color['green'], $this->image_bg_color['blue']);
}
if($this->bgimg != "") { $this->setBackground(); }
$this->code = $this->generateCode($this->code_length);
if (!$this->draw_lines_over_text && $this->draw_lines) $this->drawLines();
$this->drawWord();
if ($this->draw_lines_over_text && $this->draw_lines) $this->drawLines();
$this->saveData();
$this->output();
}
function setBackground()
{
$dat = @getimagesize($this->bgimg);
if($dat == FALSE) { return; }
switch($dat[2]) {
case 1: $newim = @imagecreatefromgif($this->bgimg); break;
case 2: $newim = @imagecreatefromjpeg($this->bgimg); break;
case 3: $newim = @imagecreatefrompng($this->bgimg); break;
case 15: $newim = @imagecreatefromwbmp($this->bgimg); break;
case 16: $newim = @imagecreatefromxbm($this->bgimg); break;
default: return;
}
if(!$newim) return;
imagecopy($this->im, $newim, 0, 0, 0, 0, $this->image_width, $this->image_height);
}
function drawLines()
{
$linecolor = imagecolorallocate($this->im, $this->line_color['red'], $this->line_color['green'], $this->line_color['blue']);
//vertical lines
for($x = 1; $x < $this->image_width; $x += $this->line_distance) {
imageline($this->im, $x, 0, $x, $this->image_height, $linecolor);
}
//horizontal lines
for($y = 11; $y < $this->image_height; $y += $this->line_distance) {
imageline($this->im, 0, $y, $this->image_width, $y, $linecolor);
}
if ($this->draw_angled_lines == TRUE) {
for ($x = -($this->image_height); $x < $this->image_width; $x += $this->line_distance) {
imageline($this->im, $x, 0, $x + $this->image_height, $this->image_height, $linecolor);
}
for ($x = $this->image_width + $this->image_height; $x > 0; $x -= $this->line_distance) {
imageline($this->im, $x, 0, $x - $this->image_height, $this->image_height, $linecolor);
}
}
}
function drawWord()
{
if($this->use_transparent_text == TRUE) {
$alpha = floor($this->text_transparency_percentage / 100 * 127);
$font_color = imagecolorallocatealpha($this->im, $this->text_color['red'], $this->text_color['green'], $this->text_color['blue'], $alpha);
} else { //no transparency
$font_color = imagecolorallocate($this->im, $this->text_color['red'], $this->text_color['green'], $this->text_color['blue']);
}
$x = $this->text_x_start;
$strlen = strlen($this->code);
$y_min = ($this->image_height / 2) + ($this->font_size / 2) - 2;
$y_max = ($this->image_height / 2) + ($this->font_size / 2) + 2;
for($i = 0; $i < $strlen; ++$i) {
$angle = rand($this->text_angle_minimum, $this->text_angle_maximum);
$y = rand($y_min, $y_max);
imagettftext($this->im, $this->font_size, $angle, $x, $y, $font_color, $this->ttf_file, $this->code{$i});
if($this->shadow_text == TRUE) {
imagettftext($this->im, $this->font_size, $angle, $x + 2, $y + 2, $font_color, $this->ttf_file, $this->code{$i});
}
$x += rand($this->text_minimum_distance, $this->text_maximum_distance);
}
}
function generateCode($len)
{
$code = "";
for($i = 1; $i <= $len; ++$i) {
$code .= chr(rand(65, 90));
}
return $code;
}
function output()
{
header("Expires: Sun, 1 Jan 2000 12:00:00 GMT");
header("Last-Modified: " . gmdate("D, d M Y H:i:s") . "GMT");
header("Cache-Control: no-store, no-cache, must-revalidate");
header("Cache-Control: post-check=0, pre-check=0", false);
header("Pragma: no-cache");
header("Content-Type: image/jpeg");
imagejpeg($this->im);
imagedestroy($this->im);
}
function saveData()
{
$filename = md5($this->hash_salt . $_SERVER['REMOTE_ADDR']);
$fp = fopen($this->data_directory . "/" . $filename, "w+");
fwrite($fp, md5( $this->hash_salt . strtolower($this->code) ) );
fclose($fp);
}
function validate()
{
$filename = md5($this->hash_salt . $_SERVER['REMOTE_ADDR']);
$enced_code = trim(@file_get_contents($this->data_directory . "/" . $filename));
$check = md5($this->hash_salt . strtolower($this->code_entered));
if($check == $enced_code) {
$this->correct_code = TRUE;
@unlink($this->data_directory . "/" . $filename);
} else {
$this->correct_code = FALSE;
}
}
function checkCode()
{
return $this->correct_code;
}
function pruneOld()
{
if ($handle = @opendir($this->data_directory)) {
while (($filename = readdir($handle)) !== false) {
if(time() - filemtime($this->data_directory . "/" . $filename) > $this->prune_minimum_age * 60) {
@unlink($this->data_directory . "/" . $filename);
}
}
closedir($handle);
}
}
} //end class
?>
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