Allow account endpoint to be filtered on various fields.

app/Rules/Account/IsValidAccountType.php

@@ -0,0 +1,57 @@
+<?php
+/*
+ * IsValidAccountType.php
+ * Copyright (c) 2024 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/.
+ */
+
+declare(strict_types=1);
+
+namespace FireflyIII\Rules\Account;
+
+use Closure;
+use FireflyIII\Support\Http\Api\AccountFilter;
+use Illuminate\Contracts\Validation\ValidationRule;
+
+class IsValidAccountType implements ValidationRule
+{
+    use AccountFilter;
+
+    /**
+     * @inheritDoc
+     */
+    #[\Override] public function validate(string $attribute, mixed $value, Closure $fail): void
+    {
+
+        if (!is_array($value)) {
+            $value = [$value];
+        }
+        // only check the type.
+        if (array_key_exists('type', $value)) {
+            $value    = $value['type'];
+            $filtered = [];
+            $keys     = array_keys($this->types);
+            /** @var mixed $entry */
+            foreach ($value as $entry) {
+                $entry = (string) $entry;
+                if (!in_array($entry, $keys)) {
+                    $fail('something');
+                }
+            }
+        }
+    }
+}