Refactor `Gitlab::GitAccess`

1. Don't use case statements for dispatch anymore. This leads to a lot
   of duplication, and makes the logic harder to follow.

2. Remove duplicated logic.

    - For example, the `can_push_to_branch?` exists, but we also have a
      different way of checking the same condition within `change_access_check`.

    - This kind of duplication is removed, and the `can_push_to_branch?`
      method is used in both places.

3. Move checks returning true/false to `UserAccess`.

    - All public methods in `GitAccess` now return an instance of
      `GitAccessStatus`. Previously, some methods would return
      true/false as well, which was confusing.

    - It makes sense for these kinds of checks to be at the level of a
      user, so the `UserAccess` class was repurposed for this. The prior
      `UserAccess.allowed?` classmethod is converted into an instance
      method.

    - All external uses of these checks have been migrated to use the
      `UserAccess` class

4. Move the "change_access_check" into a separate class.

    - Create the `GitAccess::ChangeAccessCheck` class to run these
      checks, which are quite substantial.

    - `ChangeAccessCheck` returns an instance of `GitAccessStatus` as
      well.

5. Break out the boolean logic in `ChangeAccessCheck` into `if/else`
   chains - this seems more readable.

6. I can understand that this might look like overkill for !4892, but I
   think this is a good opportunity to clean it up.

    - http://martinfowler.com/bliki/OpportunisticRefactoring.html

1 files changed, 1 insertions, 1 deletions

diff --git a/app/helpers/branches_helper.rb b/app/helpers/branches_helper.rb
index 601df5c18df..bfd23aa4e04 100644
--- a/app/helpers/branches_helper.rb
+++ b/app/helpers/branches_helper.rb
@@ -12,7 +12,7 @@ module BranchesHelper
   def can_push_branch?(project, branch_name)
     return false unless project.repository.branch_exists?(branch_name)
 
-    ::Gitlab::GitAccess.new(current_user, project, 'web').can_push_to_branch?(branch_name)
+    ::Gitlab::UserAccess.new(current_user, project: project).can_push_to_branch?(branch_name)
   end
 
   def project_branches