Remove NamespacesController

The main purpose of this controller was redirect to group or user page
when URL like https://gitlab.com/gitlab-org was used. Now this
functionality is handled by contrainers and take user to correct
controller right from the start
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/controllers/namespaces_controller.rb

-class NamespacesController < ApplicationController
-  skip_before_action :authenticate_user!
-
-  def show
-    namespace = Namespace.find_by(path: params[:id])
-
-    if namespace
-      if namespace.is_a?(Group)
-        group = namespace
-      else
-        user = namespace.owner
-      end
-    end
-
-    if user
-      redirect_to user_path(user)
-    elsif group && can?(current_user, :read_group, group)
-      redirect_to group_path(group)
-    elsif current_user.nil?
-      authenticate_user!
-    else
-      render_404
-    end
-  end
-end

config/routes.rb

@@ -87,7 +87,5 @@ Rails.application.routes.draw do
   # Get all keys of user
   get ':username.keys' => 'profiles/keys#get_keys', constraints: { username: /.*/ }
 
-  get ':id' => 'namespaces#show', constraints: { id: /(?:[^.]|\.(?!atom$))+/, format: /atom/ }
-
   root to: "root#index"
 end

spec/controllers/namespaces_controller_spec.rb

-require 'spec_helper'
-
-describe NamespacesController do
-  let!(:user) { create(:user, avatar: fixture_file_upload(Rails.root + "spec/fixtures/dk.png", "image/png")) }
-
-  describe "GET show" do
-    context "when the namespace belongs to a user" do
-      let!(:other_user) { create(:user) }
-
-      it "redirects to the user's page" do
-        get :show, id: other_user.username
-
-        expect(response).to redirect_to(user_path(other_user))
-      end
-    end
-
-    context "when the namespace belongs to a group" do
-      let!(:group)   { create(:group) }
-
-      context "when the group is public" do
-        context "when not signed in" do
-          it "redirects to the group's page" do
-            get :show, id: group.path
-
-            expect(response).to redirect_to(group_path(group))
-          end
-        end
-
-        context "when signed in" do
-          before do
-            sign_in(user)
-          end
-
-          it "redirects to the group's page" do
-            get :show, id: group.path
-
-            expect(response).to redirect_to(group_path(group))
-          end
-        end
-      end
-
-      context "when the group is private" do
-        before do
-          group.update_attribute(:visibility_level, Group::PRIVATE)
-        end
-
-        context "when not signed in" do
-          it "redirects to the sign in page" do
-            get :show, id: group.path
-            expect(response).to redirect_to(new_user_session_path)
-          end
-        end
-
-        context "when signed in" do
-          before do
-            sign_in(user)
-          end
-
-          context "when the user has access to the group" do
-            before do
-              group.add_developer(user)
-            end
-
-            context "when the user is blocked" do
-              before do
-                user.block
-              end
-
-              it "redirects to the sign in page" do
-                get :show, id: group.path
-
-                expect(response).to redirect_to(new_user_session_path)
-              end
-            end
-
-            context "when the user isn't blocked" do
-              it "redirects to the group's page" do
-                get :show, id: group.path
-
-                expect(response).to redirect_to(group_path(group))
-              end
-            end
-          end
-
-          context "when the user doesn't have access to the group" do
-            it "responds with status 404" do
-              get :show, id: group.path
-
-              expect(response).to have_http_status(404)
-            end
-          end
-        end
-      end
-    end
-
-    context "when the namespace doesn't exist" do
-      context "when signed in" do
-        before do
-          sign_in(user)
-        end
-
-        it "responds with status 404" do
-          get :show, id: "doesntexist"
-
-          expect(response).to have_http_status(404)
-        end
-      end
-
-      context "when not signed in" do
-        it "redirects to the sign in page" do
-          get :show, id: "doesntexist"
-
-          expect(response).to redirect_to(new_user_session_path)
-        end
-      end
-    end
-  end
-end