app/Captcha/Contracts/Image.php

@@ -0,0 +1,17 @@
+<?php declare(strict_types=1);
+
+namespace App\Captcha\Contracts;
+
+use App\Captcha\Dto\Coordinators;
+
+interface Image
+{
+    public function __construct(int $width, int $height);
+    public function getWidth(): int;
+    public function getHeight(): int;
+    public function insertBackground(string $pathToFile): self;
+    public function addText(string $text, int $x, int $y, float $size, float $angle, string $hexColor, string $fontName): Coordinators;
+    public function addLine(int $x1, int $y1, int $x2, int $y2, string $hexColor): self;
+    public function encode(): string;
+    public function __destruct();
+}

app/Captcha/Images/Image.php

@@ -0,0 +1,138 @@
+<?php declare(strict_types=1);
+
+namespace App\Captcha\Images;
+
+use App\Captcha\Contracts\Image as ImageContract;
+use App\Captcha\Dto\Coordinators;
+use App\Captcha\Exceptions\CaptchaException;
+
+final class Image implements ImageContract
+{
+    private readonly \GdImage $image;
+
+    public function __construct(int $width, int $height) {
+        $this->image = imagecreatetruecolor($width, $height);
+    }
+
+    public function getWidth(): int
+    {
+        return imagesx($this->image);
+    }
+
+    public function getHeight(): int
+    {
+        return imagesy($this->image);
+    }
+
+    public function insertBackground(string $pathToFile): ImageContract
+    {
+        list($backgroundWidth, $backgroundHeight) = getimagesize($pathToFile);
+        $background = $this->createImageFromPathToFile($pathToFile);
+        imagecopyresampled(
+            dst_image: $this->image,
+            src_image: $background,
+            dst_x: 0,
+            dst_y: 0,
+            src_x: 0,
+            src_y: 0,
+            dst_width: $this->getWidth(),
+            dst_height: $this->getHeight(),
+            src_width: $backgroundWidth,
+            src_height: $backgroundHeight
+        );
+        imagedestroy($background);
+
+        return $this;
+    }
+
+    public function addText(string $text, int $x, int $y, float $size, float $angle, string $hexColor, string $fontName): Coordinators
+    {
+        $y += intval($size);
+        $result = imagefttext(
+            image: $this->image,
+            size: $size,
+            angle: $angle,
+            x: $x,
+            y: $y,
+            color: $this->colorConvertHexToColorIndex($hexColor),
+            font_filename: $fontName,
+            text: $text
+        );
+
+        return new Coordinators(
+            x1: $result[0],
+            y1: $result[1],
+            x2: $result[2],
+            y2: $result[3],
+            x3: $result[4],
+            y3: $result[5],
+            x4: $result[6],
+            y4: $result[7]
+        );
+    }
+
+    public function addLine(int $x1, int $y1, int $x2, int $y2, string $hexColor): self
+    {
+        imageline(
+            image: $this->image,
+            x1: $x1,
+            y1: $y1,
+            x2: $x2,
+            y2: $y2,
+            color: $this->colorConvertHexToColorIndex($hexColor)
+        );
+
+        return $this;
+    }
+
+    public function encode(): string
+    {
+        ob_start();
+        imagealphablending($this->image, false);
+        imagesavealpha($this->image, true);
+        imagepng($this->image, null, -1);
+        $mime = image_type_to_mime_type(IMAGETYPE_PNG);
+        $buffer = ob_get_contents();
+        ob_end_clean();
+
+        return sprintf('data:%s;base64,%s',
+            $mime,
+            base64_encode($buffer)
+        );
+    }
+
+    public function __destruct() {
+        imagedestroy($this->image);
+    }
+
+    private function createImageFromPathToFile(string $pathToFile): \GdImage
+    {
+        return match (mime_content_type($pathToFile)) {
+            'image/jpeg' => imagecreatefromjpeg($pathToFile),
+            'image/png'  => imagecreatefrompng($pathToFile),
+            default => throw new CaptchaException('Couldn\'t open the file. Not a valid type. File ' . $pathToFile . '.')
+        };
+    }
+
+    private function colorConvertHexToColorIndex(string $hexColor): int
+    {
+        $hexColor = str_replace('#', '', $hexColor);
+
+        if (strlen($hexColor) === 3) {
+            return imagecolorexact(
+                image: $this->image,
+                red: hexdec(str_repeat(substr($hexColor, 0, 1), 2)),
+                blue: hexdec(str_repeat(substr($hexColor, 1, 1), 2)),
+                green: hexdec(str_repeat(substr($hexColor, 2, 1), 2))
+            );
+        }
+
+        $colorVal = hexdec($hexColor);
+        return imagecolorexact(
+            image: $this->image,
+            red: 0xFF & ($colorVal >> 0x10),
+            blue: 0xFF & ($colorVal >> 0x8),
+            green: 0xFF & $colorVal
+        );
+    }
+}