1 files changed, 57 insertions, 0 deletions
diff --git a/app/graphql/resolvers/users_resolver.rb b/app/graphql/resolvers/users_resolver.rb
new file mode 100644
index 00000000000..110a283b42e
--- /dev/null
+++ b/app/graphql/resolvers/users_resolver.rb
@@ -0,0 +1,57 @@
+# frozen_string_literal: true
+
+module Resolvers
+  class UsersResolver < BaseResolver
+    include Gitlab::Graphql::Authorize::AuthorizeResource
+
+    description 'Find Users'
+
+    argument :ids, [GraphQL::ID_TYPE],
+             required: false,
+             description: 'List of user Global IDs'
+
+    argument :usernames, [GraphQL::STRING_TYPE], required: false,
+              description: 'List of usernames'
+
+    argument :sort, Types::SortEnum,
+             description: 'Sort users by this criteria',
+             required: false,
+             default_value: 'created_desc'
+
+    def resolve(ids: nil, usernames: nil, sort: nil)
+      authorize!
+
+      ::UsersFinder.new(context[:current_user], finder_params(ids, usernames, sort)).execute
+    end
+
+    def ready?(**args)
+      args = { ids: nil, usernames: nil }.merge!(args)
+
+      return super if args.values.compact.blank?
+
+      if args.values.all?
+        raise Gitlab::Graphql::Errors::ArgumentError, 'Provide either a list of usernames or ids'
+      end
+
+      super
+    end
+
+    def authorize!
+      Ability.allowed?(context[:current_user], :read_users_list) || raise_resource_not_available_error!
+    end
+
+    private
+
+    def finder_params(ids, usernames, sort)
+      params = {}
+      params[:sort] = sort if sort
+      params[:username] = usernames if usernames
+      params[:id] = parse_gids(ids) if ids
+      params
+    end
+
+    def parse_gids(gids)
+      gids.map { |gid| GitlabSchema.parse_gid(gid, expected_type: ::User).model_id }
+    end
+  end
+end