Initialer Laravel Commit für BetiX

app/Casts/EncryptedDecimal.php

@@ -0,0 +1,75 @@
+<?php
+
+namespace App\Casts;
+
+use Illuminate\Contracts\Database\Eloquent\CastsAttributes;
+use Illuminate\Support\Facades\Crypt;
+use InvalidArgumentException;
+
+/**
+ * Encrypted decimal stored as ciphertext (string) with fixed scale.
+ * Works with string or numeric inputs. Always returns string with fixed scale.
+ */
+class EncryptedDecimal implements CastsAttributes
+{
+    private int $scale;
+
+    public function __construct(int $scale = 4)
+    {
+        if ($scale < 0 || $scale > 18) {
+            throw new InvalidArgumentException('Invalid scale for EncryptedDecimal.');
+        }
+        $this->scale = $scale;
+    }
+
+    public function get($model, string $key, $value, array $attributes)
+    {
+        if ($value === null || $value === '') {
+            // Treat null as zero but do not mutate DB implicitly
+            return number_format(0, $this->scale, '.', '');
+        }
+        try {
+            $plain = Crypt::decryptString((string) $value);
+        } catch (\Throwable $e) {
+            // If value is not decryptable (legacy/plain), try to normalize as plain string
+            $plain = (string) $value;
+        }
+        return $this->normalize($plain);
+    }
+
+    public function set($model, string $key, $value, array $attributes)
+    {
+        if ($value === null || $value === '') {
+            return [$key => null];
+        }
+        $normalized = $this->normalize($value);
+        return [$key => Crypt::encryptString($normalized)];
+    }
+
+    private function normalize($value): string
+    {
+        // Accept numeric, string with comma/dot; normalize to string with fixed scale
+        $s = is_string($value) ? trim($value) : (string) $value;
+        $s = str_replace([',', ' '], ['', ''], $s);
+        if (!preg_match('/^-?\d*(?:\.\d+)?$/', $s)) {
+            throw new InvalidArgumentException('Invalid decimal value.');
+        }
+        if ($s === '' || $s === '-') {
+            $s = '0';
+        }
+        // Use integer math on scaled value to avoid float precision
+        $scale = $this->scale;
+        // Split integer and fractional part
+        $neg = str_starts_with($s, '-') ? '-' : '';
+        if ($neg) $s = substr($s, 1);
+        [$int, $frac] = array_pad(explode('.', $s, 2), 2, '');
+        $frac = substr($frac . str_repeat('0', $scale), 0, $scale);
+        $intPart = ltrim($int === '' ? '0' : $int, '0');
+        if ($intPart === '') { $intPart = '0'; }
+        $out = ($neg ? '-' : '') . $intPart;
+        if ($scale > 0) {
+            $out .= '.' . $frac;
+        }
+        return $out;
+    }
+}