Файл: vendor/visavi/captcha/src/CaptchaBuilder.php
Строк: 205
<?php
declare(strict_types=1);
namespace VisaviCaptcha;
class CaptchaBuilder
{
protected array $frames;
protected string $phrase;
protected int $width = 150;
protected int $height = 40;
protected string $font;
protected array|null $textColor = null;
protected array|null $backgroundColor = null;
protected int $windowWidth = 75;
protected int $pixelPerFrame = 15;
protected int $delayBetweenFrames = 20;
/**
* @param string|null $phrase
*/
public function __construct(?string $phrase = null)
{
if ($phrase) {
$this->phrase = $phrase;
} else {
$phraseBuilder = new PhraseBuilder();
$this->phrase = $phraseBuilder->getPhrase(rand(4, 6));
}
}
/**
* Get phrase
*
* @return string
*/
public function getPhrase(): string
{
return $this->phrase;
}
/**
* Set text color
*
* @param int $r
* @param int $g
* @param int $b
*
* @return $this
*/
public function setTextColor(int $r, int $g, int $b): self
{
$this->textColor = [$r, $g, $b];
return $this;
}
/**
* Set background color
*
* @param int $r
* @param int $g
* @param int $b
*
* @return $this
*/
public function setBackgroundColor(int $r, int $g, int $b): self
{
$this->backgroundColor = [$r, $g, $b];
return $this;
}
/**
* Set image width
*
* @param int $width
*
* @return $this
*/
public function setWidth(int $width): self
{
$this->width = $width;
return $this;
}
/**
* Set image height
*
* @param int $height
*
* @return $this
*/
public function setHeight(int $height): self
{
$this->height = $height;
return $this;
}
/**
* Set window width
*
* @param int $width
*
* @return $this
*/
public function setWindowWidth(int $width): self
{
$this->windowWidth = $width;
return $this;
}
/**
* Set pixel per frame
*
* @param int $pixel
*
* @return $this
*/
public function setPixelPerFrame(int $pixel): self
{
$this->pixelPerFrame = $pixel;
return $this;
}
/**
* Set delay between frames
*
* @param int $microseconds
*
* @return $this
*/
public function setDelayBetweenFrames(int $microseconds): self
{
$this->delayBetweenFrames = $microseconds;
return $this;
}
/**
* Set font
*
* @param string $path
*
* @return $this
*/
public function setFont(string $path): self
{
$this->font = $path;
return $this;
}
/**
* Render captcha
*
* @return string
* @throws
*/
public function render(): string
{
$this->frames = $this->getFrames();
$delays = [];
for ($i = 0, $iMax = count($this->frames); $i < $iMax; $i++) {
$delays[] = $this->delayBetweenFrames;
}
return (new GifEncoder($this->frames, $delays, 0, 2))->getAnimation();
}
/**
* Get captcha inline
*
* @return string
*/
public function inline(): string
{
return 'data:image/jpeg;base64,' . base64_encode($this->render());
}
/**
* Returns gif frames
*
* @return array
*/
public function getFrames(): array
{
$frames = [];
$params = $this->getImageParams();
for ($i = -$this->windowWidth; $i < $this->width; $i += $this->pixelPerFrame) {
$image = $this->getBaseImage();
$foregroundColor = $this->createColor($image, $params['backgroundColor']);
// left foreground rectangle
imagefilledrectangle($image, 0, 0, $i, $this->height, $foregroundColor);
// right foreground rectangle
imagefilledrectangle($image, $i + $this->windowWidth, 0, $this->width, $this->height, $foregroundColor);
$this->applyEffect($image, $params);
$frames[] = $this->getImageContent($image);
}
return $frames;
}
/**
* Get image params
*
* @return array
*/
protected function getImageParams(): array
{
static $params;
if (! $params) {
$params['font'] = $this->font ?? __DIR__ . '/../fonts/' . rand(0, 6) . '.ttf';
$params['size'] = $this->width / max(strlen($this->phrase), 5);
$box = imagettfbbox($params['size'], 0, $params['font'], $this->phrase);
$params['textWidth'] = $box[2] - $box[0];
$params['textHeight'] = abs($box[7] + $box[1]);
$params['x'] = (int) (($this->width - $params['textWidth']) / 2);
$params['y'] = (int) (($this->height + $params['textHeight']) / 2);
$params['textColor'] = $this->textColor ?? [rand(0, 150), rand(0, 150), rand(0, 150)];
$params['backgroundColor'] = $this->backgroundColor ?? [rand(200, 255), rand(200, 255), rand(200, 255)];
$params['negate'] = rand(0, 1);
}
return $params;
}
/**
* Apply some post effects
*
* @param resource $image
*
* @param array $params
*/
protected function applyEffect($image, array $params): void
{
if (! function_exists('imagefilter')) {
return;
}
if ($this->backgroundColor || $this->textColor) {
return;
}
if ($params['negate'] === 1) {
imagefilter($image, IMG_FILTER_NEGATE);
}
}
/**
* Create a base image with the text
*
* @return resource
*/
protected function getBaseImage()
{
$params = $this->getImageParams();
$image = imagecreatetruecolor($this->width, $this->height);
// Background
$backgroundColor = $this->createColor($image, $params['backgroundColor']);
imagefilledrectangle($image, 0, 0, $this->width, $this->height, $backgroundColor);
// Text
$textColor = $this->createColor($image, $params['textColor']);
imagettftext($image, $params['size'], 0, $params['x'], $params['y'], $textColor, $params['font'], $this->phrase);
return $image;
}
/**
* Create color
*
* @param resource $image
* @param array $color
*
* @return false|int
*/
protected function createColor($image, array $color): bool|int
{
return imagecolorallocate($image, $color[0], $color[1], $color[2]);
}
/**
* Get image content
*
* @param resource $image
*
* @return false|string
*/
protected function getImageContent($image): bool|string
{
ob_start();
imagegif($image);
imagedestroy($image);
return ob_get_clean();
}
}