Implement Keystone environment deployments

app/Http/Requests/StoreServiceRequest.php

@@ -0,0 +1,56 @@
+<?php
+
+namespace App\Http\Requests;
+
+use App\Enums\ServiceCategory;
+use App\Enums\ServiceType;
+use App\Models\Server;
+use Illuminate\Foundation\Http\FormRequest;
+use Illuminate\Validation\Rule;
+
+class StoreServiceRequest extends FormRequest
+{
+    /**
+     * Determine if the user is authorized to make this request.
+     */
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    /**
+     * Get the validation rules that apply to the request.
+     *
+     * @return array<string, \Illuminate\Contracts\Validation\ValidationRule|array<mixed>|string>
+     */
+    public function rules(): array
+    {
+        return [
+            'name' => ['required', 'string', 'max:255'],
+            'category' => ['required', Rule::enum(ServiceCategory::class)],
+            'type' => ['required', Rule::enum(ServiceType::class)],
+            'version' => ['required', 'string', function (string $attribute, mixed $value, \Closure $fail): void {
+                if (! isset(config('keystone.services')[$this->category][$this->type]['versions'][$value])) {
+                    $fail('The selected version is invalid.');
+                }
+            }],
+        ];
+    }
+
+    public function after(): array
+    {
+        return [
+            function ($validator): void {
+                if ($this->category !== ServiceCategory::GATEWAY->value) {
+                    return;
+                }
+
+                $server = Server::find($this->route('server'));
+
+                if ($server?->services()->where('category', ServiceCategory::GATEWAY)->exists()) {
+                    $validator->errors()->add('category', 'This server already has a gateway service.');
+                }
+            },
+        ];
+    }
+}