Password protected access to “/wp-admin” on nginx

Here i found advice how to make wordpress more securely, idea is to protect access to “/wp-admin” by http auth, but “/wp-admin/admin-ajax.php” must stay available for everyone, same is true for some .css files.
I spend some time to research solution, it was a bit complicated:

location /wp-admin {
	location ~ /wp-admin/admin-ajax.php$ {
		# Php handler
	}
	location ~* /wp-admin/.*\.php$ {
		auth_basic            "You shall not pass!";
		auth_basic_user_file  $document_root/.htpasswd;
		# Php handler
	}
}

It is possible to add additional location to serve static content, but i am too lazy to do it.

PS
Also here i found receipts for apache and lighttpd if anybody interesting.
Apache:

AuthUserFile /path/to/your/htpasswd
AuthType basic
AuthName "Restricted Resource"
require valid-user# This is the whitelisting of the ajax handler
<Files admin-ajax.php>
    Order allow,deny
    Allow from all
    Satisfy any
</Files>

Lighttpd:

$HTTP["url"] =~ "^\/wp-admin\/.*" {
    $HTTP["url"] !~ "^\/wp-admin\/(admin-ajax\.php|css\/.*)" {
        auth.require = (
            "" => (
                "method" => "basic",
                "realm" => "Password protected area",
                "require" => "user=theuser",
            ),
        ),
    },
},

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