Refactor splitting container image full path

[ci skip]

app/models/container_image.rb

 class ContainerImage < ActiveRecord::Base
-  include Routable
-
   belongs_to :project
 
   delegate :container_registry,  to: :project
@@ -45,14 +43,13 @@ class ContainerImage < ActiveRecord::Base
     end
   end
 
-  # rubocop:disable RedundantReturn
+  def self.from_path(full_path)
+    return unless full_path.include?('/')
 
-  def self.split_namespace(full_path)
-    image_name = full_path.split('/').last
-    namespace = full_path.gsub(/(.*)(#{Regexp.escape('/' + image_name)})/, '\1')
-    if namespace.count('/') < 1
-      namespace, image_name = full_path, ""
-    end
-    return namespace, image_name
+    path = full_path[0...full_path.rindex('/')]
+    name = full_path[full_path.rindex('/')+1..-1]
+    project = Project.find_by_full_path(path)
+
+    self.new(name: name, path: path, project: project)
   end
 end

app/services/auth/container_registry_authentication_service.rb

@@ -62,12 +62,7 @@ module Auth
     end
 
     def process_repository_access(type, name, actions)
-      # Strips image name due to lack of
-      # per image authentication.
-      # Removes only last occurence in light
-      # of future nested groups
-      namespace, a = ContainerImage::split_namespace(name)
-      requested_project = Project.find_by_full_path(namespace)
+      requested_project = ContainerImage.from_path(name).project
       return unless requested_project
 
       actions = actions.select do |action|