Add option to disallow users from registering any application to use GitLab as an OAuth provider

CHANGELOG

 Please view this file on the master branch, on stable branches it's out of date.
 
 v 7.12.0 (unreleased)
+  - Add option to disallow users from registering any application to use GitLab as an OAuth provider
   - Refactor permission checks with issues and merge requests project settings (Stan Hu)
   - Fix Markdown preview not working in Edit Milestone page (Stan Hu)
   - Fix Zen Mode not closing with ESC key (Stan Hu)

app/controllers/admin/application_settings_controller.rb

@@ -43,6 +43,7 @@ class Admin::ApplicationSettingsController < Admin::ApplicationController
       :default_snippet_visibility,
       :restricted_signup_domains_raw,
       :version_check_enabled,
+      :user_oauth_applications,
       restricted_visibility_levels: [],
     )
   end

app/controllers/oauth/applications_controller.rb

 class Oauth::ApplicationsController < Doorkeeper::ApplicationsController
+  include Gitlab::CurrentSettings
   include PageLayoutHelper
   
+  before_action :verify_user_oauth_applications_enabled
   before_action :authenticate_user!
 
   layout 'profile'
@@ -32,6 +34,12 @@ class Oauth::ApplicationsController < Doorkeeper::ApplicationsController
 
   private
 
+  def verify_user_oauth_applications_enabled
+    return if current_application_settings.user_oauth_applications?
+
+    redirect_to applications_profile_url
+  end
+
   def set_application
     @application = current_user.oauth_applications.find(params[:id])
   end

app/helpers/application_settings_helper.rb

@@ -19,6 +19,10 @@ module ApplicationSettingsHelper
     current_application_settings.sign_in_text
   end
 
+  def user_oauth_applications?
+    current_application_settings.user_oauth_applications
+  end
+
   # Return a group of checkboxes that use Bootstrap's button plugin for a
   # toggle button effect.
   def restricted_level_checkboxes(help_block_id)

app/models/application_setting.rb

@@ -18,6 +18,7 @@
 #  default_project_visibility   :integer
 #  default_snippet_visibility   :integer
 #  restricted_signup_domains    :text
+#  user_oauth_applications      :bool             default(TRUE)
 #
 
 class ApplicationSetting < ActiveRecord::Base

app/views/admin/application_settings/_form.html.haml

@@ -30,7 +30,7 @@
         .checkbox
           = f.label :twitter_sharing_enabled do
             = f.check_box :twitter_sharing_enabled, :'aria-describedby' => 'twitter_help_block'
-            %strong Twitter enabled
+            Twitter enabled
           %span.help-block#twitter_help_block Show users a button to share their newly created public or internal projects on twitter
     .form-group
       .col-sm-offset-2.col-sm-10
@@ -83,6 +83,13 @@
       .col-sm-10
         = f.text_area :restricted_signup_domains_raw, placeholder: 'domain.com', class: 'form-control'
         .help-block Only users with e-mail addresses that match these domain(s) will be able to sign-up. Wildcards allowed. Use separate lines for multiple entries. Ex: domain.com, *.domain.com
+    .form_group
+      = f.label :user_oauth_applications, 'User OAuth applications', class: 'control-label col-sm-2'
+      .col-sm-10
+        .checkbox
+          = f.label :user_oauth_applications do
+            = f.check_box :user_oauth_applications
+            Allow users to register any application to use GitLab as an OAuth provider
 
   .form-actions
     = f.submit 'Save', class: 'btn btn-primary'

app/views/profiles/applications.html.haml

@@ -2,10 +2,15 @@
 %h3.page-title
   = page_title
 %p.light
-  OAuth2 protocol settings below.
+  - if user_oauth_applications?
+    Manage applications that can use GitLab as an OAuth provider, 
+    and applications that you've authorized to use your account.
+  - else
+    Manage applications that you've authorized to use your account.
 %hr
 
-.oauth-applications
+- if user_oauth_applications?
+  .oauth-applications
     %h3
       Your applications
       .pull-right
@@ -31,6 +36,7 @@
               %td= render 'doorkeeper/applications/delete_form', application: application
 
 .oauth-authorized-applications.prepend-top-20
+  - if user_oauth_applications?
     %h3
       Authorized applications
 

db/migrate/20150529111607_add_user_oauth_applications_to_application_settings.rb

+class AddUserOauthApplicationsToApplicationSettings < ActiveRecord::Migration
+  def change
+    add_column :application_settings, :user_oauth_applications, :bool, default: true
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20150516060434) do
+ActiveRecord::Schema.define(version: 20150529111607) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -33,6 +33,7 @@ ActiveRecord::Schema.define(version: 20150516060434) do
     t.integer  "default_project_visibility"
     t.integer  "default_snippet_visibility"
     t.text     "restricted_signup_domains"
+    t.boolean  "user_oauth_applications",      default: true
   end
 
   create_table "broadcast_messages", force: true do |t|