Expose permissions on types in GraphQL

This adds a reusable way to expose permissions for a user to types in
GraphQL.

1 files changed, 17 insertions, 0 deletions

diff --git a/app/graphql/types/permission_types/merge_request.rb b/app/graphql/types/permission_types/merge_request.rb
new file mode 100644
index 00000000000..5c21f6ee9c6
--- /dev/null
+++ b/app/graphql/types/permission_types/merge_request.rb
@@ -0,0 +1,17 @@
+module Types
+  module PermissionTypes
+    class MergeRequest < BasePermissionType
+      present_using MergeRequestPresenter
+      description 'Check permissions for the current user on a merge request'
+      graphql_name 'MergeRequestPermissions'
+
+      abilities :read_merge_request, :admin_merge_request,
+                :update_merge_request, :create_note
+
+      permission_field :push_to_source_branch, method: :can_push_to_source_branch?
+      permission_field :remove_source_branch, method: :can_remove_source_branch?
+      permission_field :cherry_pick_on_current_merge_request, method: :can_cherry_pick_on_current_merge_request?
+      permission_field :revert_on_current_merge_request, method: :can_revert_on_current_merge_request?
+    end
+  end
+end