laranode/app/Http/Requests/CreateDatabaseRequest.php

<?php

namespace App\Http\Requests;

use App\Models\Database;
use Illuminate\Foundation\Http\FormRequest;
use Illuminate\Validation\Rule;

class CreateDatabaseRequest extends FormRequest
{
    /**
     * Determine if the user is authorized to make this request.
     */
    public function authorize(): bool
    {
        return true; // Authorization handled by policy
    }

    /**
     * Get the validation rules that apply to the request.
     *
     * @return array<string, \Illuminate\Contracts\Validation\ValidationRule|array<mixed>|string>
     */
    public function rules(): array
    {
        $user = $this->user();
        $prefix = $user->username . '_';

        return [
            'name' => [
                'required', 
                'string', 
                'max:64',
                'regex:/^' . preg_quote($prefix) . '[a-zA-Z0-9_]+$/',
                'unique:' . Database::class . ',name'
            ],
            'db_user' => [
                'required', 
                'string', 
                'max:32',
                'regex:/^' . preg_quote($prefix) . '[a-zA-Z0-9_]+$/'
            ],
            'db_pass' => ['required', 'string', 'min:8'],
            'charset' => ['required', 'string'],
            'collation' => ['required', 'string'],
        ];
    }

    /**
     * Get custom messages for validator errors.
     */
    public function messages(): array
    {
        $user = $this->user();
        $prefix = $user->username . '_';

        return [
            'name.regex' => 'Database name must start with ' . $prefix . ' and contain only letters, numbers, and underscores.',
            'db_user.regex' => 'Database username must start with ' . $prefix . ' and contain only letters, numbers, and underscores.',
            'name.unique' => 'A database with this name already exists.',
        ];
    }
}