Add user show endpoint for Pleroma admin API

lib/pleroma/web/admin_api/admin_api_controller.ex

@@ -45,6 +45,15 @@ defmodule Pleroma.Web.AdminAPI.AdminAPIController do
     |> json(user.nickname)
   end
 
+  def user_show(conn, %{"nickname" => nickname}) do
+    with %User{} = user <- User.get_by_nickname(nickname) do
+      conn
+      |> json(AccountView.render("show.json", %{user: user}))
+    else
+      _ -> {:error, :not_found}
+    end
+  end
+
   def user_toggle_activation(conn, %{"nickname" => nickname}) do
     user = User.get_by_nickname(nickname)
 
@@ -231,6 +240,12 @@ defmodule Pleroma.Web.AdminAPI.AdminAPIController do
     |> json(token.token)
   end
 
+  def errors(conn, {:error, :not_found}) do
+    conn
+    |> put_status(404)
+    |> json("Not found")
+  end
+
   def errors(conn, {:param_cast, _}) do
     conn
     |> put_status(400)

lib/pleroma/web/router.ex

@@ -140,6 +140,7 @@ defmodule Pleroma.Web.Router do
     pipe_through([:admin_api, :oauth_write])
 
     get("/users", AdminAPIController, :list_users)
+    get("/users/:nickname", AdminAPIController, :user_show)
     delete("/user", AdminAPIController, :user_delete)
     patch("/users/:nickname/toggle_activation", AdminAPIController, :user_toggle_activation)
     post("/user", AdminAPIController, :user_create)