Changing the hook test action to use POST

app/helpers/hooks_helper.rb

@@ -10,7 +10,7 @@ module HooksHelper
 
     trigger_human_name = trigger.to_s.tr('_', ' ').camelize
 
-    link_to path, rel: 'nofollow' do
+    link_to path, rel: 'nofollow', method: :post do
       content_tag(:span, trigger_human_name)
     end
   end

changelogs/unreleased/security-fj-missing-csrf-system-hooks.yml

+---
+title: Adding CSRF protection to Hooks test action
+merge_request:
+author:
+type: security

config/routes/admin.rb

@@ -60,7 +60,7 @@ namespace :admin do
 
   resources :hooks, only: [:index, :create, :edit, :update, :destroy] do
     member do
-      get :test
+      post :test
     end
 
     resources :hook_logs, only: [:show] do

config/routes/project.rb

@@ -337,7 +337,7 @@ constraints(::Constraints::ProjectUrlConstrainer.new) do
 
       resources :hooks, only: [:index, :create, :edit, :update, :destroy], constraints: { id: /\d+/ } do
         member do
-          get :test
+          post :test
         end
 
         resources :hook_logs, only: [:show] do

spec/routing/admin_routing_spec.rb

@@ -79,7 +79,7 @@ end
 # edit_admin_hook GET    /admin/hooks/:id(.:format)           admin/hooks#edit
 describe Admin::HooksController, "routing" do
   it "to #test" do
-    expect(get("/admin/hooks/1/test")).to route_to('admin/hooks#test', id: '1')
+    expect(post("/admin/hooks/1/test")).to route_to('admin/hooks#test', id: '1')
   end
 
   it "to #index" do

spec/routing/project_routing_spec.rb

@@ -389,7 +389,7 @@ describe 'project routing' do
   #                   DELETE /:project_id/hooks/:id(.:format)      hooks#destroy
   describe Projects::HooksController, 'routing' do
     it 'to #test' do
-      expect(get('/gitlab/gitlabhq/hooks/1/test')).to route_to('projects/hooks#test', namespace_id: 'gitlab', project_id: 'gitlabhq', id: '1')
+      expect(post('/gitlab/gitlabhq/hooks/1/test')).to route_to('projects/hooks#test', namespace_id: 'gitlab', project_id: 'gitlabhq', id: '1')
     end
 
     it_behaves_like 'RESTful project resources' do