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721 lines
18 KiB
721 lines
18 KiB
<?php
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namespace Gregwar\Captcha;
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use \Exception;
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/**
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* Builds a new captcha image
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* Uses the fingerprint parameter, if one is passed, to generate the same image
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*
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* @author Gregwar <g.passault@gmail.com>
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* @author Jeremy Livingston <jeremy.j.livingston@gmail.com>
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*/
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class CaptchaBuilder implements CaptchaBuilderInterface
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{
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/**
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* @var array
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*/
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protected $fingerprint = array();
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/**
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* @var bool
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*/
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protected $useFingerprint = false;
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/**
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* @var array
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*/
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protected $textColor = null;
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/**
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* @var array
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*/
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protected $backgroundColor = null;
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/**
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* @var array
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*/
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protected $backgroundImages = array();
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/**
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* @var resource
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*/
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protected $contents = null;
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/**
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* @var string
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*/
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protected $phrase = null;
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/**
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* @var PhraseBuilderInterface
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*/
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protected $builder;
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/**
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* @var bool
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*/
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protected $distortion = true;
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/**
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* The maximum number of lines to draw in front of
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* the image. null - use default algorithm
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*/
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protected $maxFrontLines = null;
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/**
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* The maximum number of lines to draw behind
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* the image. null - use default algorithm
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*/
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protected $maxBehindLines = null;
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/**
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* The maximum angle of char
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*/
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protected $maxAngle = 8;
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/**
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* The maximum offset of char
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*/
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protected $maxOffset = 5;
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/**
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* Is the interpolation enabled ?
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*
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* @var bool
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*/
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protected $interpolation = true;
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/**
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* Ignore all effects
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*
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* @var bool
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*/
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protected $ignoreAllEffects = false;
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/**
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* Allowed image types for the background images
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*
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* @var array
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*/
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protected $allowedBackgroundImageTypes = array('image/png', 'image/jpeg', 'image/gif');
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/**
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* The image contents
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*/
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public function getContents()
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{
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return $this->contents;
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}
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/**
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* Enable/Disables the interpolation
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*
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* @param $interpolate bool True to enable, false to disable
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*
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* @return CaptchaBuilder
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*/
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public function setInterpolation($interpolate = true)
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{
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$this->interpolation = $interpolate;
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return $this;
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}
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/**
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* Temporary dir, for OCR check
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*/
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public $tempDir = 'temp/';
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public function __construct($phrase = null, PhraseBuilderInterface $builder = null)
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{
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if ($builder === null) {
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$this->builder = new PhraseBuilder;
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} else {
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$this->builder = $builder;
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}
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if ($phrase === null) {
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$phrase = $this->builder->build();
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}
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$this->phrase = $phrase;
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}
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/**
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* Setting the phrase
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*/
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public function setPhrase($phrase)
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{
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$this->phrase = (string) $phrase;
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}
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/**
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* Enables/disable distortion
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*/
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public function setDistortion($distortion)
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{
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$this->distortion = (bool) $distortion;
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return $this;
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}
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public function setMaxBehindLines($maxBehindLines)
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{
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$this->maxBehindLines = $maxBehindLines;
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return $this;
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}
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public function setMaxFrontLines($maxFrontLines)
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{
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$this->maxFrontLines = $maxFrontLines;
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return $this;
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}
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public function setMaxAngle($maxAngle)
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{
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$this->maxAngle = $maxAngle;
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return $this;
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}
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public function setMaxOffset($maxOffset)
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{
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$this->maxOffset = $maxOffset;
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return $this;
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}
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/**
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* Gets the captcha phrase
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*/
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public function getPhrase()
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{
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return $this->phrase;
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}
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/**
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* Returns true if the given phrase is good
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*/
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public function testPhrase($phrase)
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{
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return ($this->builder->niceize($phrase) == $this->builder->niceize($this->getPhrase()));
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}
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/**
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* Instantiation
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*/
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public static function create($phrase = null)
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{
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return new self($phrase);
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}
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/**
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* Sets the text color to use
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*/
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public function setTextColor($r, $g, $b)
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{
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$this->textColor = array($r, $g, $b);
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return $this;
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}
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/**
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* Sets the background color to use
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*/
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public function setBackgroundColor($r, $g, $b)
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{
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$this->backgroundColor = array($r, $g, $b);
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return $this;
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}
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/**
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* Sets the ignoreAllEffects value
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*
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* @param bool $ignoreAllEffects
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* @return CaptchaBuilder
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*/
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public function setIgnoreAllEffects($ignoreAllEffects)
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{
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$this->ignoreAllEffects = $ignoreAllEffects;
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return $this;
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}
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/**
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* Sets the list of background images to use (one image is randomly selected)
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*/
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public function setBackgroundImages(array $backgroundImages)
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{
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$this->backgroundImages = $backgroundImages;
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return $this;
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}
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/**
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* Draw lines over the image
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*/
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protected function drawLine($image, $width, $height, $tcol = null)
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{
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if ($tcol === null) {
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$tcol = imagecolorallocate($image, $this->rand(100, 255), $this->rand(100, 255), $this->rand(100, 255));
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}
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if ($this->rand(0, 1)) { // Horizontal
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$Xa = $this->rand(0, $width/2);
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$Ya = $this->rand(0, $height);
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$Xb = $this->rand($width/2, $width);
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$Yb = $this->rand(0, $height);
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} else { // Vertical
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$Xa = $this->rand(0, $width);
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$Ya = $this->rand(0, $height/2);
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$Xb = $this->rand(0, $width);
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$Yb = $this->rand($height/2, $height);
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}
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imagesetthickness($image, $this->rand(1, 3));
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imageline($image, $Xa, $Ya, $Xb, $Yb, $tcol);
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}
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/**
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* Apply some post effects
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*/
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protected function postEffect($image)
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{
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if (!function_exists('imagefilter')) {
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return;
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}
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if ($this->backgroundColor != null || $this->textColor != null) {
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return;
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}
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// Negate ?
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if ($this->rand(0, 1) == 0) {
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imagefilter($image, IMG_FILTER_NEGATE);
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}
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// Edge ?
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if ($this->rand(0, 10) == 0) {
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imagefilter($image, IMG_FILTER_EDGEDETECT);
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}
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// Contrast
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imagefilter($image, IMG_FILTER_CONTRAST, $this->rand(-50, 10));
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// Colorize
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if ($this->rand(0, 5) == 0) {
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imagefilter($image, IMG_FILTER_COLORIZE, $this->rand(-80, 50), $this->rand(-80, 50), $this->rand(-80, 50));
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}
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}
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/**
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* Writes the phrase on the image
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*/
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protected function writePhrase($image, $phrase, $font, $width, $height)
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{
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$length = strlen($phrase);
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if ($length === 0) {
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return \imagecolorallocate($image, 0, 0, 0);
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}
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// Gets the text size and start position
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$size = $width / $length - $this->rand(0, 3) - 1;
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$box = \imagettfbbox($size, 0, $font, $phrase);
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$textWidth = $box[2] - $box[0];
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$textHeight = $box[1] - $box[7];
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$x = ($width - $textWidth) / 2;
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$y = ($height - $textHeight) / 2 + $size;
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if (!count($this->textColor)) {
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$textColor = array($this->rand(0, 150), $this->rand(0, 150), $this->rand(0, 150));
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} else {
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$textColor = $this->textColor;
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}
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$col = \imagecolorallocate($image, $textColor[0], $textColor[1], $textColor[2]);
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// Write the letters one by one, with random angle
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for ($i=0; $i<$length; $i++) {
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$box = \imagettfbbox($size, 0, $font, $phrase[$i]);
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$w = $box[2] - $box[0];
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$angle = $this->rand(-$this->maxAngle, $this->maxAngle);
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$offset = $this->rand(-$this->maxOffset, $this->maxOffset);
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\imagettftext($image, $size, $angle, $x, $y + $offset, $col, $font, $phrase[$i]);
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$x += $w;
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}
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return $col;
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}
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/**
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* Try to read the code against an OCR
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*/
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public function isOCRReadable()
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{
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if (!is_dir($this->tempDir)) {
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@mkdir($this->tempDir, 0755, true);
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}
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$tempj = $this->tempDir . uniqid('captcha', true) . '.jpg';
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$tempp = $this->tempDir . uniqid('captcha', true) . '.pgm';
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$this->save($tempj);
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shell_exec("convert $tempj $tempp");
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$value = trim(strtolower(shell_exec("ocrad $tempp")));
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@unlink($tempj);
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@unlink($tempp);
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return $this->testPhrase($value);
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}
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/**
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* Builds while the code is readable against an OCR
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*/
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public function buildAgainstOCR($width = 150, $height = 40, $font = null, $fingerprint = null)
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{
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do {
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$this->build($width, $height, $font, $fingerprint);
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} while ($this->isOCRReadable());
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}
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/**
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* Generate the image
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*/
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public function build($width = 150, $height = 40, $font = null, $fingerprint = null)
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{
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if (null !== $fingerprint) {
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$this->fingerprint = $fingerprint;
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$this->useFingerprint = true;
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} else {
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$this->fingerprint = array();
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$this->useFingerprint = false;
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}
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if ($font === null) {
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$font = __DIR__ . '/Font/captcha'.$this->rand(0, 5).'.ttf';
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}
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if (empty($this->backgroundImages)) {
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// if background images list is not set, use a color fill as a background
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$image = imagecreatetruecolor($width, $height);
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if ($this->backgroundColor == null) {
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$bg = imagecolorallocate($image, $this->rand(200, 255), $this->rand(200, 255), $this->rand(200, 255));
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} else {
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$color = $this->backgroundColor;
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$bg = imagecolorallocate($image, $color[0], $color[1], $color[2]);
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}
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$this->background = $bg;
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imagefill($image, 0, 0, $bg);
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} else {
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// use a random background image
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$randomBackgroundImage = $this->backgroundImages[rand(0, count($this->backgroundImages)-1)];
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$imageType = $this->validateBackgroundImage($randomBackgroundImage);
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$image = $this->createBackgroundImageFromType($randomBackgroundImage, $imageType);
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}
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// Apply effects
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if (!$this->ignoreAllEffects) {
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$square = $width * $height;
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$effects = $this->rand($square/3000, $square/2000);
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// set the maximum number of lines to draw in front of the text
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if ($this->maxBehindLines != null && $this->maxBehindLines > 0) {
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$effects = min($this->maxBehindLines, $effects);
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}
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if ($this->maxBehindLines !== 0) {
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for ($e = 0; $e < $effects; $e++) {
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$this->drawLine($image, $width, $height);
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}
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}
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}
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// Write CAPTCHA text
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$color = $this->writePhrase($image, $this->phrase, $font, $width, $height);
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// Apply effects
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if (!$this->ignoreAllEffects) {
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$square = $width * $height;
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$effects = $this->rand($square/3000, $square/2000);
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// set the maximum number of lines to draw in front of the text
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if ($this->maxFrontLines != null && $this->maxFrontLines > 0) {
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$effects = min($this->maxFrontLines, $effects);
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}
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if ($this->maxFrontLines !== 0) {
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for ($e = 0; $e < $effects; $e++) {
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$this->drawLine($image, $width, $height, $color);
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}
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}
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}
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// Distort the image
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if ($this->distortion && !$this->ignoreAllEffects) {
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$image = $this->distort($image, $width, $height, $bg);
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}
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// Post effects
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if (!$this->ignoreAllEffects) {
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$this->postEffect($image);
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}
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$this->contents = $image;
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return $this;
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}
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/**
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* Distorts the image
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*/
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public function distort($image, $width, $height, $bg)
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{
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$contents = imagecreatetruecolor($width, $height);
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$X = $this->rand(0, $width);
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$Y = $this->rand(0, $height);
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$phase = $this->rand(0, 10);
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$scale = 1.1 + $this->rand(0, 10000) / 30000;
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for ($x = 0; $x < $width; $x++) {
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for ($y = 0; $y < $height; $y++) {
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$Vx = $x - $X;
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$Vy = $y - $Y;
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$Vn = sqrt($Vx * $Vx + $Vy * $Vy);
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if ($Vn != 0) {
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$Vn2 = $Vn + 4 * sin($Vn / 30);
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$nX = $X + ($Vx * $Vn2 / $Vn);
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$nY = $Y + ($Vy * $Vn2 / $Vn);
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} else {
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$nX = $X;
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$nY = $Y;
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}
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$nY = $nY + $scale * sin($phase + $nX * 0.2);
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if ($this->interpolation) {
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$p = $this->interpolate(
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$nX - floor($nX),
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$nY - floor($nY),
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$this->getCol($image, floor($nX), floor($nY), $bg),
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$this->getCol($image, ceil($nX), floor($nY), $bg),
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$this->getCol($image, floor($nX), ceil($nY), $bg),
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$this->getCol($image, ceil($nX), ceil($nY), $bg)
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);
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} else {
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$p = $this->getCol($image, round($nX), round($nY), $bg);
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}
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if ($p == 0) {
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$p = $bg;
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}
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imagesetpixel($contents, $x, $y, $p);
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}
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}
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return $contents;
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}
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/**
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* Saves the Captcha to a jpeg file
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*/
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public function save($filename, $quality = 90)
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{
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imagejpeg($this->contents, $filename, $quality);
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}
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/**
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* Gets the image GD
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*/
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public function getGd()
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{
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return $this->contents;
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}
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/**
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* Gets the image contents
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*/
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public function get($quality = 90)
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{
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ob_start();
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$this->output($quality);
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return ob_get_clean();
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}
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/**
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* Gets the HTML inline base64
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*/
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public function inline($quality = 90)
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{
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return 'data:image/jpeg;base64,' . base64_encode($this->get($quality));
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}
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/**
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* Outputs the image
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*/
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public function output($quality = 90)
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{
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imagejpeg($this->contents, null, $quality);
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}
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/**
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* @return array
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*/
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public function getFingerprint()
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{
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return $this->fingerprint;
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}
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/**
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* Returns a random number or the next number in the
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* fingerprint
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*/
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protected function rand($min, $max)
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{
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if (!is_array($this->fingerprint)) {
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$this->fingerprint = array();
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}
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if ($this->useFingerprint) {
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$value = current($this->fingerprint);
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next($this->fingerprint);
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} else {
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$value = mt_rand($min, $max);
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$this->fingerprint[] = $value;
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}
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return $value;
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}
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/**
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* @param $x
|
|
* @param $y
|
|
* @param $nw
|
|
* @param $ne
|
|
* @param $sw
|
|
* @param $se
|
|
*
|
|
* @return int
|
|
*/
|
|
protected function interpolate($x, $y, $nw, $ne, $sw, $se)
|
|
{
|
|
list($r0, $g0, $b0) = $this->getRGB($nw);
|
|
list($r1, $g1, $b1) = $this->getRGB($ne);
|
|
list($r2, $g2, $b2) = $this->getRGB($sw);
|
|
list($r3, $g3, $b3) = $this->getRGB($se);
|
|
|
|
$cx = 1.0 - $x;
|
|
$cy = 1.0 - $y;
|
|
|
|
$m0 = $cx * $r0 + $x * $r1;
|
|
$m1 = $cx * $r2 + $x * $r3;
|
|
$r = (int) ($cy * $m0 + $y * $m1);
|
|
|
|
$m0 = $cx * $g0 + $x * $g1;
|
|
$m1 = $cx * $g2 + $x * $g3;
|
|
$g = (int) ($cy * $m0 + $y * $m1);
|
|
|
|
$m0 = $cx * $b0 + $x * $b1;
|
|
$m1 = $cx * $b2 + $x * $b3;
|
|
$b = (int) ($cy * $m0 + $y * $m1);
|
|
|
|
return ($r << 16) | ($g << 8) | $b;
|
|
}
|
|
|
|
/**
|
|
* @param $image
|
|
* @param $x
|
|
* @param $y
|
|
*
|
|
* @return int
|
|
*/
|
|
protected function getCol($image, $x, $y, $background)
|
|
{
|
|
$L = imagesx($image);
|
|
$H = imagesy($image);
|
|
if ($x < 0 || $x >= $L || $y < 0 || $y >= $H) {
|
|
return $background;
|
|
}
|
|
|
|
return imagecolorat($image, $x, $y);
|
|
}
|
|
|
|
/**
|
|
* @param $col
|
|
*
|
|
* @return array
|
|
*/
|
|
protected function getRGB($col)
|
|
{
|
|
return array(
|
|
(int) ($col >> 16) & 0xff,
|
|
(int) ($col >> 8) & 0xff,
|
|
(int) ($col) & 0xff,
|
|
);
|
|
}
|
|
|
|
/**
|
|
* Validate the background image path. Return the image type if valid
|
|
*
|
|
* @param string $backgroundImage
|
|
* @return string
|
|
* @throws Exception
|
|
*/
|
|
protected function validateBackgroundImage($backgroundImage)
|
|
{
|
|
// check if file exists
|
|
if (!file_exists($backgroundImage)) {
|
|
$backgroundImageExploded = explode('/', $backgroundImage);
|
|
$imageFileName = count($backgroundImageExploded) > 1? $backgroundImageExploded[count($backgroundImageExploded)-1] : $backgroundImage;
|
|
|
|
throw new Exception('Invalid background image: ' . $imageFileName);
|
|
}
|
|
|
|
// check image type
|
|
$finfo = finfo_open(FILEINFO_MIME_TYPE); // return mime type ala mimetype extension
|
|
$imageType = finfo_file($finfo, $backgroundImage);
|
|
finfo_close($finfo);
|
|
|
|
if (!in_array ($imageType, $this->allowedBackgroundImageTypes)) {
|
|
throw new Exception('Invalid background image type! Allowed types are: ' . join(', ', $this->allowedBackgroundImageTypes));
|
|
}
|
|
|
|
return $imageType;
|
|
}
|
|
|
|
/**
|
|
* Create background image from type
|
|
*
|
|
* @param string $backgroundImage
|
|
* @param string $imageType
|
|
* @return resource
|
|
* @throws Exception
|
|
*/
|
|
protected function createBackgroundImageFromType($backgroundImage, $imageType)
|
|
{
|
|
switch ($imageType) {
|
|
case 'image/jpeg':
|
|
$image = imagecreatefromjpeg($backgroundImage);
|
|
break;
|
|
case 'image/png':
|
|
$image = imagecreatefrompng($backgroundImage);
|
|
break;
|
|
case 'image/gif':
|
|
$image = imagecreatefromgif($backgroundImage);
|
|
break;
|
|
|
|
default:
|
|
throw new Exception('Not supported file type for background image!');
|
|
break;
|
|
}
|
|
|
|
return $image;
|
|
}
|
|
}
|