I want be able to get token via api. Used for mobile applications

lib/api.rb

@@ -18,5 +18,6 @@ module Gitlab
     mount Issues
     mount Milestones
     mount Keys
+    mount Session
   end
 end

lib/api/entities.rb

@@ -9,6 +9,10 @@ module Gitlab
       expose :id, :email, :name, :blocked, :created_at
     end
 
+    class UserLogin < Grape::Entity
+      expose :id, :email, :name, :private_token, :blocked, :created_at
+    end
+
     class Hook < Grape::Entity
       expose :id, :url
     end
@@ -52,8 +56,8 @@ module Gitlab
     end
 
     class Key < Grape::Entity
-      expose  :id, 
-              :title, 
+      expose  :id,
+              :title,
               :key
     end
   end

lib/api/session.rb

@@ -0,0 +1,21 @@
+module Gitlab
+  # Users API
+  class Session < Grape::API
+    # Login to get token
+    #
+    # Example Request:
+    #  POST /session
+    post "/session" do
+      resource = User.find_for_database_authentication(email: params[:email])
+
+      return forbidden! unless resource
+
+      if resource.valid_password?(params[:password])
+        present resource, with: Entities::UserLogin
+      else
+        forbidden!
+      end
+    end
+  end
+end
+