mint/app/Http/Resources/UserResource.php

<?php

namespace App\Http\Resources;

use Illuminate\Http\Resources\Json\JsonResource;
use Illuminate\Support\Facades\Storage;
use Illuminate\Support\Facades\App;

class UserResource extends JsonResource
{
    /**
     * Transform the resource into an array.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return array|\Illuminate\Contracts\Support\Arrayable|\JsonSerializable
     */
    public function toArray($request)
    {
        $data = [
            "id"=>$this->userid,
            "userName"=> $this->username,
            "nickName"=> $this->nickname,
            "email"=> $this->email,
        ];
        if($this->avatar){
            $data['avatarName'] = $this->avatar;
            $img = str_replace('.jpg','_s.jpg',$this->avatar);
            if (App::environment('local')) {
                $data['avatar'] = Storage::url($img);
            }else{
                $data['avatar'] = Storage::temporaryUrl($img, now()->addDays(6));
            }
        }
        return $data;
    }
}