snipe-it/app/Http/Requests/SaveUserRequest.php

<?php

namespace App\Http\Requests;

use App\Models\Setting;

class SaveUserRequest extends Request
{
    /**
     * Determine if the user is authorized to make this request.
     *
     * @return bool
     */
    public function authorize()
    {
        return true;
    }

    /**
     * Get the validation rules that apply to the request.
     *
     * @return array
     */
    public function rules()
    {

        $rules = [];

        switch($this->method())
        {

            // Brand new user
            case 'POST':
            {
                $rules['first_name'] = 'required|string|min:1';
                $rules['username'] = 'required_unless:ldap_import,1|string|min:1';
                if ($this->request->get('ldap_import') == false)
                {
                    $rules['password'] = Setting::passwordComplexityRulesSaving('store').'|confirmed';
                }
                break;
            }

            // Save all fields
            case 'PUT':
                $rules['first_name'] = 'required|string|min:1';
                $rules['username'] = 'required_unless:ldap_import,1|string|min:1';
                $rules['password'] = Setting::passwordComplexityRulesSaving('update').'|confirmed';
                break;

            // Save only what's passed
            case 'PATCH':
            {
                $rules['password'] = Setting::passwordComplexityRulesSaving('update');
                break;
            }

            default:break;
        }
        
        return $rules;

    }
}