387 lines
9.5 KiB
PHP
387 lines
9.5 KiB
PHP
<?php
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/**
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* Script for generation of CAPTCHAs
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*
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* @author Jose Rodriguez <jose.rodriguez@exec.cl>
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* @license GPLv3
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* @link http://code.google.com/p/cool-php-captcha
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* @version 0.3
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*
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*/
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session_start();
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putenv('GDFONTPATH=' . realpath(dirname(__FILE__)) . '/fonts/');
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$captcha = new SimpleCaptcha();
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$captcha->CreateImage();
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/**
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* SimpleCaptcha class
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*
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*/
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class SimpleCaptcha {
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/** Width of the image */
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public $width = 175;
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/** Height of the image */
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public $height = 55;
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/** Dictionary word file (empty for random text) */
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public $wordsFile = '';
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/**
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* Path for resource files (fonts, words, etc.)
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*
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* "resources" by default. For security reasons, is better move this
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* directory to another location outside the web server
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*
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*/
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public $resourcesPath = './fonts';
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/** Min word length (for non-dictionary random text generation) */
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public $minWordLength = 4;
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/**
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* Max word length (for non-dictionary random text generation)
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*
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* Used for dictionary words indicating the word-length
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* for font-size modification purposes
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*/
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public $maxWordLength = 6;
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/** Sessionname to store the original text */
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public $session_var = 'tinyibcaptcha';
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/** Background color in RGB-array */
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public $backgroundColor = array(254, 254, 254);
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/** Foreground colors in RGB-array */
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public $colors = array(
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array(27, 78, 181), // blue
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array(22, 163, 35), // green
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array(214, 36, 7), // red
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);
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/** Shadow color in RGB-array or null */
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public $shadowColor = array(0, 0, 0);
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/** Horizontal line through the text */
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public $lineWidth = 3;
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/**
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* Font configuration
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*
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* - font: TTF file
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* - spacing: relative pixel space between character
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* - minSize: min font size
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* - maxSize: max font size
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*/
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public $fonts = array(
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'Roboto-Regular' => array('spacing' => 0, 'minSize' => 27, 'maxSize' => 27, 'font' => 'roboto_regular.ttf'),
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'Roboto-Bold' => array('spacing' => 0, 'minSize' => 27, 'maxSize' => 27, 'font' => 'roboto_bold.ttf')
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);
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/** Wave configuration in X and Y axes */
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public $Yperiod = 12;
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public $Yamplitude = 14;
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public $Xperiod = 11;
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public $Xamplitude = 5;
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/** letter rotation clockwise */
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public $maxRotation = 8;
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/**
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* Internal image size factor (for better image quality)
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* 1: low, 2: medium, 3: high
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*/
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public $scale = 3;
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/**
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* Blur effect for better image quality (but slower image processing).
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* Better image results with scale=3
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*/
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public $blur = true;
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/** Debug? */
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public $debug = false;
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/** Image format: jpeg or png */
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public $imageFormat = 'png';
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/** GD image */
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public $im;
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public function __construct($config = array()) {
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}
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public function CreateImage() {
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$ini = microtime(true);
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/** Initialization */
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$this->ImageAllocate();
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/** Text insertion */
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$text = $this->GetCaptchaText();
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$fontcfg = $this->fonts[array_rand($this->fonts)];
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$this->WriteText($text, $fontcfg);
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$_SESSION[$this->session_var] = $text;
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/** Transformations */
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if (!empty($this->lineWidth)) {
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$this->WriteLine();
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}
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$this->WaveImage();
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if ($this->blur && function_exists('imagefilter')) {
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imagefilter($this->im, IMG_FILTER_GAUSSIAN_BLUR);
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}
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$this->ReduceImage();
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if ($this->debug) {
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imagestring($this->im, 1, 1, $this->height - 8,
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"$text {$fontcfg['font']} " . round((microtime(true) - $ini) * 1000) . "ms",
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$this->GdFgColor
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);
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}
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/** Output */
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$this->WriteImage();
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$this->Cleanup();
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}
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/**
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* Creates the image resources
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*/
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protected function ImageAllocate() {
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// Cleanup
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if (!empty($this->im)) {
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imagedestroy($this->im);
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}
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$this->im = imagecreatetruecolor($this->width * $this->scale, $this->height * $this->scale);
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// Background color
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$this->GdBgColor = imagecolorallocate($this->im,
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$this->backgroundColor[0],
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$this->backgroundColor[1],
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$this->backgroundColor[2]
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);
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imagefilledrectangle($this->im, 0, 0, $this->width * $this->scale, $this->height * $this->scale, $this->GdBgColor);
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// Foreground color
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$color = $this->colors[mt_rand(0, sizeof($this->colors) - 1)];
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$this->GdFgColor = imagecolorallocate($this->im, $color[0], $color[1], $color[2]);
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// Shadow color
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if (!empty($this->shadowColor) && is_array($this->shadowColor) && sizeof($this->shadowColor) >= 3) {
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$this->GdShadowColor = imagecolorallocate($this->im,
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$this->shadowColor[0],
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$this->shadowColor[1],
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$this->shadowColor[2]
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);
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}
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}
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/**
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* Text generation
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*
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* @return string Text
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*/
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protected function GetCaptchaText() {
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$text = $this->GetDictionaryCaptchaText();
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if (!$text) {
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$text = $this->GetRandomCaptchaText();
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}
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return $text;
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}
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/**
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* Random text generation
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*
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* @return string Text
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*/
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protected function GetRandomCaptchaText($length = null) {
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if (empty($length)) {
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$length = rand($this->minWordLength, $this->maxWordLength);
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}
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$words = "abcdefghijlmnopqrstvwyz";
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$vocals = "aeiou";
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$text = "";
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$vocal = rand(0, 1);
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for ($i = 0; $i < $length; $i++) {
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if ($vocal) {
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$text .= substr($vocals, mt_rand(0, 4), 1);
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} else {
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$text .= substr($words, mt_rand(0, 22), 1);
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}
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$vocal = !$vocal;
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}
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return $text;
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}
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/**
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* Random dictionary word generation
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*
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* @param boolean $extended Add extended "fake" words
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* @return string Word
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*/
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function GetDictionaryCaptchaText($extended = false) {
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if (empty($this->wordsFile)) {
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return false;
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}
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// Full path of words file
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if (substr($this->wordsFile, 0, 1) == '/') {
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$wordsfile = $this->wordsFile;
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} else {
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$wordsfile = realpath(dirname(__FILE__)) . '/' . $this->resourcesPath . '/' . $this->wordsFile;
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}
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if (!file_exists($wordsfile)) {
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return false;
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}
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$fp = fopen($wordsfile, "r");
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$length = strlen(fgets($fp));
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if (!$length) {
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return false;
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}
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$line = rand(1, (filesize($wordsfile) / $length) - 2);
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if (fseek($fp, $length * $line) == -1) {
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return false;
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}
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$text = trim(fgets($fp));
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fclose($fp);
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/** Change random volcals */
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if ($extended) {
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$text = preg_split('//', $text, -1, PREG_SPLIT_NO_EMPTY);
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$vocals = array('a', 'e', 'i', 'o', 'u');
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foreach ($text as $i => $char) {
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if (mt_rand(0, 1) && in_array($char, $vocals)) {
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$text[$i] = $vocals[mt_rand(0, 4)];
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}
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}
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$text = implode('', $text);
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}
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return $text;
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}
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/**
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* Horizontal line insertion
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*/
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protected function WriteLine() {
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$x1 = $this->width * $this->scale * .15;
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$x2 = $this->textFinalX;
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$y1 = rand($this->height * $this->scale * .40, $this->height * $this->scale * .65);
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$y2 = rand($this->height * $this->scale * .40, $this->height * $this->scale * .65);
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$width = $this->lineWidth / 2 * $this->scale;
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for ($i = $width * -1; $i <= $width; $i++) {
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imageline($this->im, $x1, $y1 + $i, $x2, $y2 + $i, $this->GdFgColor);
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}
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}
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/**
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* Text insertion
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*/
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protected function WriteText($text, $fontcfg = array()) {
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if (empty($fontcfg)) {
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// Select the font configuration
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$fontcfg = $this->fonts[array_rand($this->fonts)];
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}
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$fontfile = realpath(dirname(__FILE__)) . '/' . $this->resourcesPath . '/' . $fontcfg['font'];
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/** Increase font-size for shortest words: 9% for each glyph missing */
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$lettersMissing = $this->maxWordLength - strlen($text);
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$fontSizefactor = 1 + ($lettersMissing * 0.09);
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// Text generation (char by char)
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$x = 20 * $this->scale;
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$y = round(($this->height * 27 / 40) * $this->scale);
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$length = strlen($text);
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for ($i = 0; $i < $length; $i++) {
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$degree = rand($this->maxRotation * -1, $this->maxRotation);
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$fontsize = rand($fontcfg['minSize'], $fontcfg['maxSize']) * $this->scale * $fontSizefactor;
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$letter = substr($text, $i, 1);
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if ($this->shadowColor) {
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$coords = imagettftext($this->im, $fontsize, $degree,
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$x + $this->scale, $y + $this->scale,
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$this->GdShadowColor, $fontfile, $letter);
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}
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$coords = imagettftext($this->im, $fontsize, $degree,
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$x, $y,
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$this->GdFgColor, $fontfile, $letter);
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$x += ($coords[2] - $x) + ($fontcfg['spacing'] * $this->scale);
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}
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$this->textFinalX = $x;
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}
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/**
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* Wave filter
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*/
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protected function WaveImage() {
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// X-axis wave generation
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$xp = $this->scale * $this->Xperiod * rand(1, 3);
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$k = rand(0, 100);
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for ($i = 0; $i < ($this->width * $this->scale); $i++) {
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imagecopy($this->im, $this->im,
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$i - 1, sin($k + $i / $xp) * ($this->scale * $this->Xamplitude),
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$i, 0, 1, $this->height * $this->scale);
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}
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// Y-axis wave generation
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$k = rand(0, 100);
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$yp = $this->scale * $this->Yperiod * rand(1, 2);
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for ($i = 0; $i < ($this->height * $this->scale); $i++) {
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imagecopy($this->im, $this->im,
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sin($k + $i / $yp) * ($this->scale * $this->Yamplitude), $i - 1,
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0, $i, $this->width * $this->scale, 1);
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}
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}
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/**
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* Reduce the image to the final size
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*/
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protected function ReduceImage() {
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// Reduzco el tama<6D>o de la imagen
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$imResampled = imagecreatetruecolor($this->width, $this->height);
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imagecopyresampled($imResampled, $this->im,
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0, 0, 0, 0,
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$this->width, $this->height,
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$this->width * $this->scale, $this->height * $this->scale
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);
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imagedestroy($this->im);
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$this->im = $imResampled;
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}
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/**
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* File generation
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*/
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protected function WriteImage() {
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if ($this->imageFormat == 'png' && function_exists('imagepng')) {
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imagealphablending($this->im, true);
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imagesavealpha($this->im, false);
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imagecolortransparent($this->im, $this->GdBgColor);
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header("Content-type: image/png");
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imagepng($this->im);
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} else {
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header("Content-type: image/jpeg");
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imagejpeg($this->im, null, 80);
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}
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}
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/**
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* Cleanup
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*/
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protected function Cleanup() {
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imagedestroy($this->im);
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}
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}
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