osb/app/Http/Requests/ServiceChangeRequest.php

<?php

namespace App\Http\Requests;

use Illuminate\Foundation\Http\FormRequest;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;

class ServiceChangeRequest extends FormRequest
{
    /**
     * Determine if the user is authorized to make this request.
     *
     * @return bool
     */
    public function authorize()
    {
		return $this
			->route('o')
			->AccountUserAuthorised();
    }

    /**
     * Get the validation rules that apply to the request.
     *
     * @return array<string, mixed>
	 * @todo This is specific to broadband - this needs to be more generic.
     */
    public function rules(Request $request)
    {
		if (! $request->isMethod('post'))
			return [];

        return [
            'broadband.product_id' => 'required|exists:products,id',
			'broadband.change_fee' => 'nullable|numeric',
			'broadband.price' => 'nullable|numeric',
			'broadband.start_at' => 'required|date',	// @todo Check that it is not more than 1 billing cycle ago, and not future.
        ];
    }
}