feat: picasso avatar generation (#35)

Author: faustbrian

composer.json

@@ -51,6 +51,7 @@
         "pragmarx/google2fa-laravel": "^2.0",
         "rector/rector": "^0.11",
         "ruafozy/mersenne-twister": "^1.3",
+        "savvot/random": "^0.3.0",
         "spatie/laravel-flash": "^1.8",
         "spatie/laravel-honeypot": "^4.0",
         "spatie/laravel-medialibrary": "^9.8",
@@ -101,4 +102,4 @@
     "config": {
         "sort-packages": true
     }
-}
+}

composer.lock

@@ -0,0 +1,75 @@
+<?php
+
+declare(strict_types=1);
+
+namespace ARKEcosystem\Foundation\Picasso;
+
+// See https://github.com/vechain/picasso/blob/master/src/index.ts
+
+final class Avatar
+{
+    public static function make(string $seed): string
+    {
+        $defaultColors = [
+            'rgb(244, 67, 54)',
+            'rgb(233, 30, 99)',
+            'rgb(156, 39, 176)',
+            'rgb(103, 58, 183)',
+            'rgb(63, 81, 181)',
+            'rgb(33, 150, 243)',
+            'rgb(3, 169, 244)',
+            'rgb(0, 188, 212)',
+            'rgb(0, 150, 136)',
+            'rgb(76, 175, 80)',
+            'rgb(139, 195, 74)',
+            'rgb(205, 220, 57)',
+            'rgb(255, 193, 7)',
+            'rgb(255, 152, 0)',
+            'rgb(255, 87, 34)',
+        ];
+
+        $twister = new Mersenne(static::hash($seed));
+
+        $genColor = function () use (&$defaultColors, $twister): string {
+            $index = (int) floor(count($defaultColors) * $twister->random());
+
+            return array_splice($defaultColors, $index, 1)[0];
+        };
+
+        $backgroundString = '<rect fill="'.$genColor().'" width="100" height="100"/>';
+        $styleString      = '<style>.picasso circle{mix-blend-mode:soft-light;}</style>';
+        $shapeString      = '';
+        $layers           = 3;
+        $rs               = [35, 40, 45, 50, 55, 60];
+        $cxs              = [0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100];
+        $cys              = [30, 40, 50, 60, 70];
+
+        for ($i = 0; $i < $layers; $i++) {
+            $r    = array_splice($rs, (int) floor(count($rs) * $twister->random()), 1)[0];
+            $cx   = array_splice($cxs, (int) floor(count($cxs) * $twister->random()), 1)[0];
+            $cy   = array_splice($cys, (int) floor(count($cys) * $twister->random()), 1)[0];
+            $fill = $genColor();
+
+            $shapeString .= '<circle r="'.$r.'" cx="'.$cx.'" cy="'.$cy.'" fill="'.$fill.'"/>';
+        }
+
+        return sprintf(
+            "<svg version='1.1' xmlns='http://www.w3.org/2000/svg' class='rounded-full picasso' viewBox='0 0 100 100'>%s%s%s</svg>",
+            $styleString,
+            $backgroundString,
+            $shapeString
+        );
+    }
+
+    private static function hash(string $value): int
+    {
+        $h = 0;
+
+        for ($i = 0; $i < strlen($value); $i++) {
+            $h = $h * 31 + ord($value[$i]);
+            $h = $h % (2 ** 32);
+        }
+
+        return $h;
+    }
+}

src/Picasso/Avatar.php

@@ -0,0 +1,24 @@
+<?php
+
+declare(strict_types=1);
+
+namespace ARKEcosystem\Foundation\Picasso;
+
+use mersenne_twister\twister;
+
+final class Mersenne
+{
+    private twister $twister;
+
+    public function __construct(int $seed)
+    {
+        ini_set('precision', '16');
+
+        $this->twister = new twister($seed);
+    }
+
+    public function random(): float
+    {
+        return $this->twister->real_halfopen();
+    }
+}