From 912e441bb9f5f5197ca3a63734788dcd6f1d3598 Mon Sep 17 00:00:00 2001
From: overflowerror <mail@overflowerror.com>
Date: Wed, 26 Feb 2014 19:02:06 +0100
Subject: [PATCH] added captcha

---
 images/captcha.png/index.php | 104 +++++++++++++++++++++++++++++++++++
 1 file changed, 104 insertions(+)
 create mode 100644 images/captcha.png/index.php

diff --git a/images/captcha.png/index.php b/images/captcha.png/index.php
new file mode 100644
index 0000000..b11252e
--- /dev/null
+++ b/images/captcha.png/index.php
@@ -0,0 +1,104 @@
+<?php
+	@session_start();
+	
+	$letters = "ABCDEFGHIJKLMNOPQRSTUVWgqrtimnaeh";
+	$length = 8;
+	$fontsize = 30;
+	
+	$offset = 10;
+	
+	$fieldWidth = 50;
+	$margin = $offset + 5;
+	
+	$imagesize = array();
+	$imagesize['x'] = $fieldWidth * $length + 2 * $margin;
+	$imagesize['y'] = 80;
+	
+	$fonts = array();
+	// add your fonts here
+	
+	//$fonts[] = "/data/fonts/averia.ttf";
+	//$fonts[] = "/data/fonts/bbc.ttf";
+	//$fonts[] = "/data/fonts/bybsy.ttf";
+	//$fonts[] = "/data/fonts/gtw.ttf";
+	//$fonts[] = "/data/fonts/newscycle.ttf";
+	
+	$numberOfBackgroundLines = 50;
+	$thicknesOfBackgroundLines = 2;
+	$numberOfFrontLines = 2;
+	$thicknesOfFrontLines = 3;
+	
+	$captcha = array();
+	for ($i = 0; $i < $length; $i++) {
+		$random = rand(0, strlen($letters) - 1);
+		$captcha[$i] = substr($letters, $random, 1);
+	}
+	
+	$rotations = array();
+	for ($i = 0; $i < $length; $i++) {
+		$random = rand(- $offset, $offset);
+		$rotations[$i] = $random;
+	}
+	
+	$positions = array();
+	for ($i = 0; $i < $length; $i++) {
+		$random = rand(- $offset, $offset);
+		$positions[$i] = array();
+		$positions[$i]['x'] = $random;
+		$random = rand(- $offset, $offset);
+		$positions[$i]['y'] = $random;
+	}
+	
+	$lines = array();
+	for ($i = 0; $i < $numberOfBackgroundLines; $i++) {
+		$lines[$i] = array();
+		$lines[$i][0] = rand(0, $imagesize['x']);
+		$lines[$i][1] = rand(0, $imagesize['y']);
+		$lines[$i][2] = rand(0, $imagesize['x']);
+		$lines[$i][3] = rand(0, $imagesize['y']);
+		$lines[$i][4] = $thicknesOfBackgroundLines;
+	}
+	for ($i = $numberOfBackgroundLines; $i < $numberOfBackgroundLines + $numberOfFrontLines; $i++) {
+		$lines[$i] = array();
+		$lines[$i][0] = rand(0, $imagesize['x']);
+		$lines[$i][1] = rand(0, $imagesize['y']);
+		$lines[$i][2] = rand(0, $imagesize['x']);
+		$lines[$i][3] = rand(0, $imagesize['y']);
+		$lines[$i][4] = $thicknesOfFrontLines;
+	}
+	
+	$font = $_SERVER['DOCUMENT_ROOT'] . $fonts[rand(0, count($fonts) - 1)];
+	
+	$image = imagecreatetruecolor($imagesize['x'], $imagesize['y']);
+	
+	for ($i = 0; $i < $numberOfBackgroundLines; $i++) {
+		imagesetthickness($image, $lines[$i][4]);
+		$random = rand(0, 128);
+		$color = imagecolorallocate($image, $random, 127 - $random, $random);
+		imageline($image, $lines[$i][0], $lines[$i][1], $lines[$i][2], $lines[$i][3], $color);
+	}
+	
+	$random = rand(0, 255);
+	$fontColor = imagecolorallocate($image, $random, 255, 255 - $random);
+	
+	for ($i = 0; $i < $length; $i++) {
+		imagettftext($image, $fontsize, $rotations[$i], $offset + $i * $fieldWidth + $positions[$i]['x'], $imagesize['y'] - $fontsize / 2 + $positions[$i]['y'], $fontColor, $font, $captcha[$i]);
+	}
+	
+	for ($i = $numberOfBackgroundLines; $i < $numberOfBackgroundLines + $numberOfFrontLines; $i++) {
+		imagesetthickness($image, $lines[$i][4]);
+		$random = rand(0, 128);
+		$color = imagecolorallocate($image, $random, 127 - $random, $random);
+		imageline($image, $lines[$i][0], $lines[$i][1], $lines[$i][2], $lines[$i][3], $color);
+	}
+	
+	// Note: only one captcha code at a time can be used
+	$_SESSION['captcha'] = array();
+	$_SESSION['captcha']['code'] = $captcha;
+	$_SESSION['captcha']['time'] = time();
+	$_SESSION['captcha']['used'] = false;
+	
+	header( "Content-type: image/png" );
+	imagepng($image);
+	imagedestroy($image);
+?>
\ No newline at end of file