Magento2: How to generate admin url with secure key from a controller

Question

I want to know, how can I generate a valid admin url from

1. A Controller
2. Anywhnere

so I can make any custom url admin work if I need it in an ajax or whatever. Answer for either 1 or 2 will do the job, bot I think it is better to have both.

Answer 1

From a controller you can simply use $this->getUrl('url/path/here', $paramsHere = array()).

From anywhere else:

You need to add an instance of \Magento\Framework\UrlInterface in your class and use that:

protected $urlBuider;
public function __construct(
    ....
    \Magento\Framework\UrlInterface $urlBuilder,
    ....
) {
    ....
    $this->urlBuilder = $urlBuilder;
    ....
}

Then you can use this:

$url = $this->urlBuilder->getUrl('url/path/here', $paramsHere = array());

Answer 2

You can generate secure admin url key by

protected $urlBuider;
public function __construct(
    ....
    \Magento\Backend\Model\UrlInterface $urlBuilder,
    ....
) {
    ....
    $this->urlBuilder = $urlBuilder;
    ....
}

public function Yourmethod()
{
$this->urlBuilder->getRouteUrl('RouteId/ControllerName/actionName',[ 'key'=>$this->urlBuilder->getSecretKey('RouteId','ControllerName','actionName')])
}

If you want to send parameters then add your params before key

$this->urlBuilder->getRouteUrl('RouteId/ControllerName/actionName',[ 'param1'=> 'paramValue1','param2'=> 'paramValue2','key'=>$this->urlBuilder->getSecretKey('RouteId','ControllerName','actionName')])