From c1cf5a1ae96a24b69b6116aceefa6321e10505fc Mon Sep 17 00:00:00 2001
From: Leonid Nikitin <i@kor-elf.net>
Date: Wed, 28 Jun 2023 17:24:41 +0600
Subject: [PATCH] This change introduces ImageLines, an interface for adding
 randomized lines to captcha images for enhanced security. The interface has
 been implemented in the Lines class. The goal is to randomize lines on
 captcha images to prevent bot reads.

---
 app/Captcha/Contracts/ImageLines.php |  8 +++++++
 app/Captcha/Images/Lines.php         | 36 ++++++++++++++++++++++++++++
 2 files changed, 44 insertions(+)
 create mode 100644 app/Captcha/Contracts/ImageLines.php
 create mode 100644 app/Captcha/Images/Lines.php

diff --git a/app/Captcha/Contracts/ImageLines.php b/app/Captcha/Contracts/ImageLines.php
new file mode 100644
index 0000000..5657006
--- /dev/null
+++ b/app/Captcha/Contracts/ImageLines.php
@@ -0,0 +1,8 @@
+<?php declare(strict_types=1);
+
+namespace App\Captcha\Contracts;
+
+interface ImageLines
+{
+    public function processing(Image $image, array $colors, int $lines = 3): Image;
+}
diff --git a/app/Captcha/Images/Lines.php b/app/Captcha/Images/Lines.php
new file mode 100644
index 0000000..9b4a47c
--- /dev/null
+++ b/app/Captcha/Images/Lines.php
@@ -0,0 +1,36 @@
+<?php declare(strict_types=1);
+
+namespace App\Captcha\Images;
+
+use App\Captcha\Contracts\ImageLines;
+use Illuminate\Support\Arr;
+use App\Captcha\Contracts\Image as ImageContract;
+
+class Lines implements ImageLines
+{
+    public function processing(ImageContract $image, array $colors, $lines = 3): ImageContract
+    {
+        $imageWidth = $image->getWidth();
+        $imageHeight = $image->getHeight();
+        for ($i = 0; $i <= $lines; $i++) {
+            $image->addLine(
+                x1: mt_rand(0, $imageWidth) + $i * mt_rand(0, $imageHeight),
+                y1: mt_rand(0, $imageHeight),
+                x2: mt_rand(0, $imageWidth),
+                y2: mt_rand(0, $imageHeight),
+                hexColor: $this->lineColors($colors)
+            );
+        }
+
+        return $image;
+    }
+
+    private function lineColors(array $colors): string
+    {
+        if (!empty($colors)) {
+            return Arr::random($colors);
+        }
+
+        return '#' . str_pad(dechex(mt_rand(0, 0xFFFFFF)), 6, '0', STR_PAD_LEFT);
+    }
+}