Introduce admin and moderator role, check role on list_users action

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

Add test for guards

lib/mobilizon_web/context.ex

@@ -5,19 +5,18 @@ defmodule MobilizonWeb.Context do
   @behaviour Plug
 
   import Plug.Conn
-  require Logger
+  alias Mobilizon.Users.User
 
   def init(opts) do
     opts
   end
 
   def call(conn, _) do
-    case Guardian.Plug.current_resource(conn) do
+    with %User{} = user <- Guardian.Plug.current_resource(conn) do
+      put_private(conn, :absinthe, %{context: %{current_user: user}})
+    else
       nil ->
         conn
-
-      user ->
-        put_private(conn, :absinthe, %{context: %{current_user: user}})
     end
   end
 end

lib/mobilizon_web/guardian.ex

@@ -11,6 +11,7 @@ defmodule MobilizonWeb.Guardian do
 
   alias Mobilizon.Users
   alias Mobilizon.Users.User
+  require Logger
 
   def subject_for_token(%User{} = user, _claims) do
     {:ok, "User:" <> to_string(user.id)}
@@ -21,6 +22,8 @@ defmodule MobilizonWeb.Guardian do
   end
 
   def resource_from_claims(%{"sub" => "User:" <> uid_str}) do
+    Logger.debug(fn -> "Receiving claim for user #{uid_str}" end)
+
     try do
       case Integer.parse(uid_str) do
         {uid, ""} ->
@@ -39,6 +42,8 @@ defmodule MobilizonWeb.Guardian do
   end
 
   def after_encode_and_sign(resource, claims, token, _options) do
+    Logger.debug(fn -> "after_encode_and_sign #{inspect(claims)}" end)
+
     with {:ok, _} <- Guardian.DB.after_encode_and_sign(resource, claims["typ"], claims, token) do
       {:ok, token}
     end

lib/mobilizon_web/resolvers/user.ex

@@ -6,6 +6,7 @@ defmodule MobilizonWeb.Resolvers.User do
   alias Mobilizon.Users.User
   alias Mobilizon.{Actors, Users}
   alias Mobilizon.Users.Service.{ResetPassword, Activation}
+  import Mobilizon.Users.Guards
   require Logger
 
   @doc """
@@ -32,14 +33,20 @@ defmodule MobilizonWeb.Resolvers.User do
   def list_and_count_users(
         _parent,
         %{page: page, limit: limit, sort: sort, direction: direction},
-        _resolution
-      ) do
+        %{
+          context: %{current_user: %User{role: role}}
+        }
+      )
+      when is_moderator(role) do
     total = Task.async(&Users.count_users/0)
     elements = Task.async(fn -> Users.list_users(page, limit, sort, direction) end)
 
     {:ok, %{total: Task.await(total), elements: Task.await(elements)}}
   end
 
+  def list_and_count_users(_parent, _args, _resolution),
+    do: {:error, "You need to have admin access to list users"}
+
   @doc """
   Login an user. Returns a token and the user
   """