Use router helper to generate reset password link

lib/pleroma/web/admin_api/admin_api_controller.ex

@@ -17,7 +17,9 @@ defmodule Pleroma.Web.AdminAPI.AdminAPIController do
   alias Pleroma.Web.AdminAPI.ReportView
   alias Pleroma.Web.AdminAPI.Search
   alias Pleroma.Web.CommonAPI
+  alias Pleroma.Web.Endpoint
   alias Pleroma.Web.MastodonAPI.StatusView
+  alias Pleroma.Web.Router
 
   import Pleroma.Web.ControllerHelper, only: [json_response: 3]
 
@@ -432,13 +434,11 @@ def revoke_invite(conn, %{"token" => token}) do
   def get_password_reset(conn, %{"nickname" => nickname}) do
     (%User{local: true} = user) = User.get_cached_by_nickname(nickname)
     {:ok, token} = Pleroma.PasswordResetToken.create_token(user)
-    host = Pleroma.Config.get([Pleroma.Web.Endpoint, :url, :host])
-    protocol = Pleroma.Config.get([Pleroma.Web.Endpoint, :protocol])
 
     conn
     |> json(%{
       token: token.token,
-      link: "#{protocol}://#{host}/api/pleroma/password_reset/#{token.token}"
+      link: Router.Helpers.reset_password_url(Endpoint, :reset, token.token)
     })
   end
 

test/web/admin_api/admin_api_controller_test.exs

@@ -596,7 +596,9 @@ test "/api/pleroma/admin/users/:nickname/password_reset" do
       |> put_req_header("accept", "application/json")
       |> get("/api/pleroma/admin/users/#{user.nickname}/password_reset")
 
-    assert conn.status == 200
+    resp = json_response(conn, 200)
+
+    assert Regex.match?(~r/(http:\/\/|https:\/\/)/, resp["link"])
   end
 
   describe "GET /api/pleroma/admin/users" do