Merge branch 'fix-restricted-visibility' into 'master'

Restricted visibility levels - bug fix and new feature

This allows admin users to override restricted visibility settings when creating and updating projects and snippets, and moves the restricted visibility configuration from gitlab.yml to the web UI.  See #1903.

## Move configuration location

I added a new section to the application settings page for restricted visibility levels.  Each level has a checkbox, styled with Bootstrap to look like a toggle button.  A checked box means that the level is restricted.  I added a glowing text shadow and changed the background color for checked buttons because the default styles made it hard to distinguish between checked and unchecked.  This image shows the new section with the "Public" box checked:

![restricted_visibility_settings](https://dev.gitlab.org/Okada/gitlabhq/uploads/629562e4313f89b795e81c3bb0f95893/restricted_visibility_settings.png)

## Allow admins to override

To allow admin users to override the restricted visibility levels, I had to remove the `visibility_level` validation from the `Project` class.  The model doesn't know about the `current_user`, which should determine whether the restrictions can be overridden.  We could use the creator in the validation, but that wouldn't work correctly for projects where a non-admin user is the creator and an admin tries to change the project to a restricted visibility level.

The `Project::UpdateService` and `Project::CreateService` classes already had code to determine whether the current user is allowed to use a given visibility level; now all visibility level validation is done in those classes.  Currently, when a non-admin tries to create or update a project using a restricted level, these classes silently set the visibility level to the global default (create) or the project's existing value (update).  I changed this behavior to be more like an Active Model validation, where using a restricted level causes the entire request to be rejected.

Project and personal snippets didn't have service classes, and restricted visibility levels weren't being enforced in the model or the controllers.  The UI disabled radio buttons for restricted levels, but that wouldn't be difficult to circumvent.  I created the `CreateSnippetService` and `UpdateSnippetService` classes to do the same restricted visibility check that the project classes do.  And since I was dealing with snippet visibility levels, I updated the API endpoints for project snippets to allow users to set and update the visibility level.

## TODO

* [x] Add more tests for restricted visibility functionality

cc @sytse @dzaporozhets

See merge request !1655

3 files changed, 22 insertions, 3 deletions

diff --git a/app/helpers/application_settings_helper.rb b/app/helpers/application_settings_helper.rb
index 1ee086da997..241d6075c9f 100644
--- a/app/helpers/application_settings_helper.rb
+++ b/app/helpers/application_settings_helper.rb
@@ -18,4 +18,21 @@ module ApplicationSettingsHelper
   def extra_sign_in_text
     current_application_settings.sign_in_text
   end
+
+  # Return a group of checkboxes that use Bootstrap's button plugin for a
+  # toggle button effect.
+  def restricted_level_checkboxes(help_block_id)
+    Gitlab::VisibilityLevel.options.map do |name, level|
+      checked = restricted_visibility_levels(true).include?(level)
+      css_class = 'btn btn-primary'
+      css_class += ' active' if checked
+      checkbox_name = 'application_setting[restricted_visibility_levels][]'
+
+      label_tag(checkbox_name, class: css_class) do
+        check_box_tag(checkbox_name, level, checked,
+                      autocomplete: 'off',
+                      'aria-describedby' => help_block_id) + name
+      end
+    end
+  end
 end
diff --git a/app/helpers/gitlab_routing_helper.rb b/app/helpers/gitlab_routing_helper.rb
index 8518a47a3a0..b005cb8e417 100644
--- a/app/helpers/gitlab_routing_helper.rb
+++ b/app/helpers/gitlab_routing_helper.rb
@@ -45,7 +45,8 @@ module GitlabRoutingHelper
     namespace_project_merge_request_url(entity.project.namespace, entity.project, entity, *args)
   end
 
-  def snippet_url(entity, *args)
+  def project_snippet_url(entity, *args)
     namespace_project_snippet_url(entity.project.namespace, entity.project, entity, *args)
+
   end
 end
diff --git a/app/helpers/visibility_level_helper.rb b/app/helpers/visibility_level_helper.rb
index deb9c8b4d49..7c090dc594c 100644
--- a/app/helpers/visibility_level_helper.rb
+++ b/app/helpers/visibility_level_helper.rb
@@ -60,7 +60,8 @@ module VisibilityLevelHelper
     Project.visibility_levels.key(level)
   end
 
-  def restricted_visibility_levels
-    current_user.is_admin? ? [] : gitlab_config.restricted_visibility_levels
+  def restricted_visibility_levels(show_all = false)
+    return [] if current_user.is_admin? && !show_all
+    current_application_settings.restricted_visibility_levels
   end
 end