Initial commit

www/lib/artichow/AntiSpam.class.php

@@ -0,0 +1,224 @@
+<?php
+/*
+ * This work is hereby released into the Public Domain.
+ * To view a copy of the public domain dedication,
+ * visit http://creativecommons.org/licenses/publicdomain/ or send a letter to
+ * Creative Commons, 559 Nathan Abbott Way, Stanford, California 94305, USA.
+ *
+ */
+
+require_once dirname(__FILE__)."/Image.class.php";
+
+/**
+ * AntiSpam
+ * String printed on the images are case insensitive.
+ *
+ * @package Artichow
+ */
+class awAntiSpam extends awImage {
+
+	/**
+	 * Anti-spam string
+	 *
+	 * @var string
+	 */
+	protected $string;
+
+	/**
+	 * Noise intensity
+	 *
+	 * @var int
+	 */
+	protected $noise = 0;
+	 	
+	/**
+	 * Construct a new awAntiSpam image
+	 *
+	 * @param string $string A string to display
+	 */
+	public function __construct($string = '') {
+	
+		parent::__construct();
+		
+		$this->string = (string)$string;
+	
+	}
+	
+	/**
+	 * Create a random string
+	 *
+	 * @param int $length String length
+	 * @return string String created
+	 */
+	public function setRand($length) {
+	
+		$length = (int)$length;
+	
+		$this->string = '';
+		
+		$letters = 'aAbBCDeEFgGhHJKLmMnNpPqQRsStTuVwWXYZz2345679';
+		$number = strlen($letters);
+	
+		for($i = 0; $i < $length; $i++) {
+			$this->string .= $letters{mt_rand(0, $number - 1)};
+		}
+		
+		return $this->string;
+		
+	}
+	
+	/**
+	 * Set noise on image
+	 *
+	 * @param int $nois Noise intensity (from 0 to 10)
+	 */
+	public function setNoise($noise) {
+		if($noise < 0) {
+			$noise = 0;
+		}
+		if($noise > 10) {
+			$noise = 10;
+		}
+		$this->noise = (int)$noise;
+	}
+	
+	/**
+	 * Save string value in session
+	 * You can use check() to verify the value later
+	 *
+	 * @param string $qName A name that identify the anti-spam image
+	 */
+	public function save($qName) {
+		$this->session();
+		$session = 'artichow_'.(string)$qName;
+		$_SESSION[$session] = $this->string;
+	}
+	
+	/**
+	 * Verify user entry
+	 *
+	 * @param string $qName A name that identify the anti-spam image
+	 * @param string $value User-defined value
+	 * @param bool $case TRUE for case insensitive check, FALSE for case sensitive check ? (default to TRUE)
+	 * @return bool TRUE if the value is correct, FALSE otherwise
+	 */
+	public function check($qName, $value, $case = TRUE) {
+	
+		$this->session();
+	
+		$session = 'artichow_'.(string)$qName;
+		
+		return (
+			array_key_exists($session, $_SESSION) === TRUE and
+			$case ?
+				(strtolower($_SESSION[$session]) === strtolower((string)$value)) :
+				($_SESSION[$session] === (string)$value)
+		);
+	
+	}
+	
+	/**
+	 * Draw image
+	 */
+	public function draw() {
+
+		$fonts = array(
+			'Tuffy',
+			'TuffyBold',
+			'TuffyItalic',
+			'TuffyBoldItalic'
+		);
+		
+		$sizes = array(12, 12.5, 13, 13.5, 14, 15, 16, 17, 18, 19);
+		
+		$widths = array();
+		$heights = array();
+		$texts = array();
+		
+		// Set up a temporary driver to allow font size calculations...
+		$this->setSize(10, 10);
+		$driver = $this->getDriver();
+		
+		for($i = 0; $i < strlen($this->string); $i++) {
+		
+			$fontKey = array_rand($fonts);
+			$sizeKey = array_rand($sizes);
+		
+			$font = new awTTFFont(
+				$fonts[$fontKey], $sizes[$sizeKey]
+			);
+			
+			$text = new awText(
+				$this->string{$i},
+				$font,
+				NULL,
+				mt_rand(-15, 15)
+			);
+			
+			$widths[] = $driver->getTextWidth($text);
+			$heights[] = $driver->getTextHeight($text);
+			$texts[] = $text;
+		
+		}
+		
+		// ... and get rid of it.
+		$this->driver = NULL;
+		
+		$width = array_sum($widths);
+		$height = array_max($heights);
+		
+		$totalWidth = $width + 10 + count($texts) * 10;
+		$totalHeight = $height + 20;
+		
+		$this->setSize($totalWidth, $totalHeight);
+	
+		$this->create();
+		
+		for($i = 0; $i < strlen($this->string); $i++) {
+		
+			$this->driver->string(
+				$texts[$i],
+				new awPoint(
+					5 + array_sum(array_slice($widths, 0, $i)) + $widths[$i] / 2 + $i * 10,
+					10 + ($height - $heights[$i]) / 2
+				)
+			);
+		
+		}
+		
+		$this->drawNoise($totalWidth, $totalHeight);
+		
+		$this->send();
+		
+	}
+	
+	protected function drawNoise($width, $height) {
+	
+		$points = $this->noise * 30;
+		$color = new awColor(0, 0, 0);
+		
+		for($i = 0; $i < $points; $i++) {
+			$this->driver->point(
+				$color,
+				new awPoint(
+					mt_rand(0, $width),
+					mt_rand(0, $height)
+				)
+			);
+		}
+	
+	}
+	
+	protected function session() {
+	
+		// Start session if needed
+		if(!session_id()) {
+			session_start();
+		}
+		
+	}
+
+}
+
+registerClass('AntiSpam');
+?>