Introduce support for 3rd-party auth (OAuth2 & LDAP)

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

lib/graphql/schema/config.ex

@@ -39,6 +39,7 @@ defmodule Mobilizon.GraphQL.Schema.ConfigType do
     end
 
     field(:rules, :string, description: "The instance's rules")
+    field(:auth, :auth, description: "The instance auth methods")
   end
 
   object :terms do
@@ -132,6 +133,16 @@ defmodule Mobilizon.GraphQL.Schema.ConfigType do
     field(:groups, :boolean)
   end
 
+  object :auth do
+    field(:ldap, :boolean, description: "Whether or not LDAP auth is enabled")
+    field(:oauth_providers, list_of(:oauth_provider), description: "List of oauth providers")
+  end
+
+  object :oauth_provider do
+    field(:id, :string, description: "The provider ID")
+    field(:label, :string, description: "The label for the auth provider")
+  end
+
   object :config_queries do
     @desc "Get the instance config"
     field :config, :config do

lib/graphql/schema/user.ex

@@ -52,6 +52,8 @@ defmodule Mobilizon.GraphQL.Schema.UserType do
 
     field(:locale, :string, description: "The user's locale")
 
+    field(:provider, :string, description: "The user's login provider")
+
     field(:disabled, :boolean, description: "Whether the user is disabled")
 
     field(:participations, :paginated_participant_list,