LDAP groups api

lib/api/ldap.rb

+module API
+  # groups API
+  class Ldap < Grape::API
+    before { authenticate! }
+
+    resource :ldap do
+      # Get a LDAP groups list. Limit size to 20 of them.
+      # Filter results by name using search param
+      #
+      # Example Request:
+      #  GET /ldap/groups
+      get 'groups' do
+        @groups = Gitlab::LDAP::Adapter.new.groups("#{params[:search]}*", 20)
+        present @groups, with: Entities::LdapGroup
+      end
+    end
+  end
+end

spec/requests/api/ldap_spec.rb

+require 'spec_helper'
+
+describe API::API do
+  include ApiHelpers
+  let(:user) { create(:user) }
+
+  before do
+    groups = [
+      OpenStruct.new(cn: 'developers'),
+      OpenStruct.new(cn: 'students')
+    ]
+
+    Gitlab::LDAP::Adapter.any_instance.stub(
+      groups: groups
+    )
+  end
+
+  describe "GET /ldap/groups" do
+    context "when unauthenticated" do
+      it "should return authentication error" do
+        get api("/ldap/groups")
+        response.status.should == 401
+      end
+    end
+
+    context "when authenticated as user" do
+      it "should return an array of ldap groups" do
+        get api("/ldap/groups", user)
+        response.status.should == 200
+        json_response.should be_an Array
+        json_response.length.should == 2
+        json_response.first['cn'].should == 'developers'
+      end
+    end
+  end
+end