Fix sort params

app/Rules/IsValidSortInstruction.php

@@ -0,0 +1,64 @@
+<?php
+/*
+ * IsValidSortInstruction.php
+ * Copyright (c) 2025 james@firefly-iii.org
+ *
+ * This file is part of Firefly III (https://github.com/firefly-iii).
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+namespace FireflyIII\Rules;
+
+use Closure;
+use Illuminate\Contracts\Validation\ValidationRule;
+
+class IsValidSortInstruction implements ValidationRule
+{
+    private string $class;
+
+    public function __construct(string $class)
+    {
+        $this->class = $class;
+    }
+
+    public function validate(string $attribute, mixed $value, Closure $fail): void
+    {
+        $shortClass = str_replace('FireflyIII\\Models\\', '', $this->class);
+        if (!is_string($value)) {
+            $fail('validation.invalid_sort_instruction')->translate(['object' => $shortClass]);
+            return;
+        }
+        $validParameters = config(sprintf('firefly.allowed_sort_parameters.%s', $shortClass));
+        if (!is_array($validParameters)) {
+            $fail('validation.no_sort_instructions')->translate(['object' => $shortClass]);
+            return;
+        }
+        $parts = explode(',', $value);
+        foreach ($parts as $i => $part) {
+            $part = trim($part);
+            if (strlen($part) < 2) {
+                $fail('validation.invalid_sort_instruction_index')->translate(['index' => $i, 'object' => $shortClass]);
+                return;
+            }
+            if ('-' === $part[0]) {
+                $part = substr($part, 1);
+            }
+            if (!in_array($part, $validParameters, true)) {
+                $fail('validation.invalid_sort_instruction_index')->translate(['index' => $i, 'object' => $shortClass]);
+                return;
+            }
+        }
+    }
+}