<?php
namespace MailPoetVendor\Gregwar\Captcha;
if (!defined('ABSPATH')) exit;
use Exception;
class CaptchaBuilder implements CaptchaBuilderInterface
{
protected $fingerprint = array();
protected $useFingerprint = \false;
protected $textColor = array();
protected $lineColor = null;
protected $backgroundColor = null;
protected $backgroundImages = array();
protected $contents = null;
protected $phrase = null;
protected $builder;
protected $distortion = \true;
protected $maxFrontLines = null;
protected $maxBehindLines = null;
protected $maxAngle = 8;
protected $maxOffset = 5;
protected $interpolation = \true;
protected $ignoreAllEffects = \false;
protected $allowedBackgroundImageTypes = array('image/png', 'image/jpeg', 'image/gif');
public function getContents()
{
return $this->contents;
}
public function setInterpolation($interpolate = \true)
{
$this->interpolation = $interpolate;
return $this;
}
public $tempDir = 'temp/';
public function __construct($phrase = null, PhraseBuilderInterface $builder = null)
{
if ($builder === null) {
$this->builder = new PhraseBuilder();
} else {
$this->builder = $builder;
}
$this->phrase = \is_string($phrase) ? $phrase : $this->builder->build($phrase);
}
public function setPhrase($phrase)
{
$this->phrase = (string) $phrase;
}
public function setDistortion($distortion)
{
$this->distortion = (bool) $distortion;
return $this;
}
public function setMaxBehindLines($maxBehindLines)
{
$this->maxBehindLines = $maxBehindLines;
return $this;
}
public function setMaxFrontLines($maxFrontLines)
{
$this->maxFrontLines = $maxFrontLines;
return $this;
}
public function setMaxAngle($maxAngle)
{
$this->maxAngle = $maxAngle;
return $this;
}
public function setMaxOffset($maxOffset)
{
$this->maxOffset = $maxOffset;
return $this;
}
public function getPhrase()
{
return $this->phrase;
}
public function testPhrase($phrase)
{
return $this->builder->niceize($phrase) == $this->builder->niceize($this->getPhrase());
}
public static function create($phrase = null)
{
return new self($phrase);
}
public function setTextColor($r, $g, $b)
{
$this->textColor = array($r, $g, $b);
return $this;
}
public function setBackgroundColor($r, $g, $b)
{
$this->backgroundColor = array($r, $g, $b);
return $this;
}
public function setLineColor($r, $g, $b)
{
$this->lineColor = array($r, $g, $b);
return $this;
}
public function setIgnoreAllEffects($ignoreAllEffects)
{
$this->ignoreAllEffects = $ignoreAllEffects;
return $this;
}
public function setBackgroundImages(array $backgroundImages)
{
$this->backgroundImages = $backgroundImages;
return $this;
}
protected function drawLine($image, $width, $height, $tcol = null)
{
if ($this->lineColor === null) {
$red = $this->rand(100, 255);
$green = $this->rand(100, 255);
$blue = $this->rand(100, 255);
} else {
$red = $this->lineColor[0];
$green = $this->lineColor[1];
$blue = $this->lineColor[2];
}
if ($tcol === null) {
$tcol = \imagecolorallocate($image, $red, $green, $blue);
}
if ($this->rand(0, 1)) {
// Horizontal
$Xa = $this->rand(0, $width / 2);
$Ya = $this->rand(0, $height);
$Xb = $this->rand($width / 2, $width);
$Yb = $this->rand(0, $height);
} else {
// Vertical
$Xa = $this->rand(0, $width);
$Ya = $this->rand(0, $height / 2);
$Xb = $this->rand(0, $width);
$Yb = $this->rand($height / 2, $height);
}
\imagesetthickness($image, $this->rand(1, 3));
\imageline($image, $Xa, $Ya, $Xb, $Yb, $tcol);
}
protected function postEffect($image)
{
if (!\function_exists('imagefilter')) {
return;
}
if ($this->backgroundColor != null || $this->textColor != null) {
return;
}
// Negate ?
if ($this->rand(0, 1) == 0) {
\imagefilter($image, \IMG_FILTER_NEGATE);
}
// Edge ?
if ($this->rand(0, 10) == 0) {
\imagefilter($image, \IMG_FILTER_EDGEDETECT);
}
// Contrast
\imagefilter($image, \IMG_FILTER_CONTRAST, $this->rand(-50, 10));
// Colorize
if ($this->rand(0, 5) == 0) {
\imagefilter($image, \IMG_FILTER_COLORIZE, $this->rand(-80, 50), $this->rand(-80, 50), $this->rand(-80, 50));
}
}
protected function writePhrase($image, $phrase, $font, $width, $height)
{
$length = \mb_strlen($phrase);
if ($length === 0) {
return \imagecolorallocate($image, 0, 0, 0);
}
// Gets the text size and start position
$size = (int) round($width / $length) - $this->rand(0, 3) - 1;
$box = \imagettfbbox($size, 0, $font, $phrase);
$textWidth = $box[2] - $box[0];
$textHeight = $box[1] - $box[7];
$x = (int) round(($width - $textWidth) / 2);
$y = (int) round(($height - $textHeight) / 2) + $size;
if (!$this->textColor) {
$textColor = array($this->rand(0, 150), $this->rand(0, 150), $this->rand(0, 150));
} else {
$textColor = $this->textColor;
}
$col = \imagecolorallocate($image, $textColor[0], $textColor[1], $textColor[2]);
// Write the letters one by one, with random angle
for ($i = 0; $i < $length; $i++) {
$symbol = \mb_substr($phrase, $i, 1);
$box = \imagettfbbox($size, 0, $font, $symbol);
$w = $box[2] - $box[0];
$angle = $this->rand(-$this->maxAngle, $this->maxAngle);
$offset = $this->rand(-$this->maxOffset, $this->maxOffset);
\imagettftext($image, $size, $angle, $x, $y + $offset, $col, $font, $symbol);
$x += $w;
}
return $col;
}
public function isOCRReadable()
{
if (!\is_dir($this->tempDir)) {
@\mkdir($this->tempDir, 0755, \true);
}
$tempj = $this->tempDir . \uniqid('captcha', \true) . '.jpg';
$tempp = $this->tempDir . \uniqid('captcha', \true) . '.pgm';
$this->save($tempj);
\shell_exec("convert {$tempj} {$tempp}");
$value = \trim(\strtolower(\shell_exec("ocrad {$tempp}")));
@\unlink($tempj);
@\unlink($tempp);
return $this->testPhrase($value);
}
public function buildAgainstOCR($width = 150, $height = 40, $font = null, $fingerprint = null)
{
do {
$this->build($width, $height, $font, $fingerprint);
} while ($this->isOCRReadable());
}
public function build($width = 150, $height = 40, $font = null, $fingerprint = null)
{
if (null !== $fingerprint) {
$this->fingerprint = $fingerprint;
$this->useFingerprint = \true;
} else {
$this->fingerprint = array();
$this->useFingerprint = \false;
}
if ($font === null) {
$font = __DIR__ . '/Font/captcha' . $this->rand(0, 5) . '.ttf';
}
if (empty($this->backgroundImages)) {
// if background images list is not set, use a color fill as a background
$image = \imagecreatetruecolor($width, $height);
if ($this->backgroundColor == null) {
$bg = \imagecolorallocate($image, $this->rand(200, 255), $this->rand(200, 255), $this->rand(200, 255));
} else {
$color = $this->backgroundColor;
$bg = \imagecolorallocate($image, $color[0], $color[1], $color[2]);
}
$this->background = $bg;
\imagefill($image, 0, 0, $bg);
} else {
// use a random background image
$randomBackgroundImage = $this->backgroundImages[\rand(0, \count($this->backgroundImages) - 1)];
$imageType = $this->validateBackgroundImage($randomBackgroundImage);
$image = $this->createBackgroundImageFromType($randomBackgroundImage, $imageType);
}
// Apply effects
if (!$this->ignoreAllEffects) {
$square = $width * $height;
$effects = $this->rand($square / 3000, $square / 2000);
// set the maximum number of lines to draw in front of the text
if ($this->maxBehindLines != null && $this->maxBehindLines > 0) {
$effects = \min($this->maxBehindLines, $effects);
}
if ($this->maxBehindLines !== 0) {
for ($e = 0; $e < $effects; $e++) {
$this->drawLine($image, $width, $height);
}
}
}
// Write CAPTCHA text
$color = $this->writePhrase($image, $this->phrase, $font, $width, $height);
// Apply effects
if (!$this->ignoreAllEffects) {
$square = $width * $height;
$effects = $this->rand($square / 3000, $square / 2000);
// set the maximum number of lines to draw in front of the text
if ($this->maxFrontLines != null && $this->maxFrontLines > 0) {
$effects = \min($this->maxFrontLines, $effects);
}
if ($this->maxFrontLines !== 0) {
for ($e = 0; $e < $effects; $e++) {
$this->drawLine($image, $width, $height, $color);
}
}
}
// Distort the image
if ($this->distortion && !$this->ignoreAllEffects) {
$image = $this->distort($image, $width, $height, $bg);
}
// Post effects
if (!$this->ignoreAllEffects) {
$this->postEffect($image);
}
$this->contents = $image;
return $this;
}
public function distort($image, $width, $height, $bg)
{
$contents = \imagecreatetruecolor($width, $height);
$X = $this->rand(0, $width);
$Y = $this->rand(0, $height);
$phase = $this->rand(0, 10);
$scale = 1.1 + $this->rand(0, 10000) / 30000;
for ($x = 0; $x < $width; $x++) {
for ($y = 0; $y < $height; $y++) {
$Vx = $x - $X;
$Vy = $y - $Y;
$Vn = \sqrt($Vx * $Vx + $Vy * $Vy);
if ($Vn != 0) {
$Vn2 = $Vn + 4 * \sin($Vn / 30);
$nX = $X + $Vx * $Vn2 / $Vn;
$nY = $Y + $Vy * $Vn2 / $Vn;
} else {
$nX = $X;
$nY = $Y;
}
$nY = $nY + $scale * \sin($phase + $nX * 0.2);
if ($this->interpolation) {
$p = $this->interpolate($nX - \floor($nX), $nY - \floor($nY), $this->getCol($image, \floor($nX), \floor($nY), $bg), $this->getCol($image, \ceil($nX), \floor($nY), $bg), $this->getCol($image, \floor($nX), \ceil($nY), $bg), $this->getCol($image, \ceil($nX), \ceil($nY), $bg));
} else {
$p = $this->getCol($image, \round($nX), \round($nY), $bg);
}
if ($p == 0) {
$p = $bg;
}
\imagesetpixel($contents, $x, $y, $p);
}
}
return $contents;
}
public function save($filename, $quality = 90)
{
\imagejpeg($this->contents, $filename, $quality);
}
public function getGd()
{
return $this->contents;
}
public function get($quality = 90)
{
\ob_start();
$this->output($quality);
return \ob_get_clean();
}
public function inline($quality = 90)
{
return 'data:image/jpeg;base64,' . \base64_encode($this->get($quality));
}
public function output($quality = 90)
{
\imagejpeg($this->contents, null, $quality);
}
public function getFingerprint()
{
return $this->fingerprint;
}
protected function rand($min, $max)
{
if (!\is_array($this->fingerprint)) {
$this->fingerprint = array();
}
if ($this->useFingerprint) {
$value = \current($this->fingerprint);
\next($this->fingerprint);
} else {
$value = \mt_rand((int) $min, (int)$max);
$this->fingerprint[] = $value;
}
return $value;
}
protected function interpolate($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 | $b;
}
protected function getCol($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, $y);
}
protected function getRGB($col)
{
return array((int) ($col >> 16) & 0xff, (int) ($col >> 8) & 0xff, (int) $col & 0xff);
}
protected function validateBackgroundImage($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 $imageType;
}
protected function createBackgroundImageFromType($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;
}
}