1 files changed, 28 insertions, 0 deletions
diff --git a/activestorage/lib/active_storage/service/configurator.rb b/activestorage/lib/active_storage/service/configurator.rb
new file mode 100644
index 0000000000..a0afdaa912
--- /dev/null
+++ b/activestorage/lib/active_storage/service/configurator.rb
@@ -0,0 +1,28 @@
+class ActiveStorage::Service::Configurator #:nodoc:
+  attr_reader :configurations
+
+  def self.build(service_name, configurations)
+    new(configurations).build(service_name)
+  end
+
+  def initialize(configurations)
+    @configurations = configurations.deep_symbolize_keys
+  end
+
+  def build(service_name)
+    config = config_for(service_name.to_sym)
+    resolve(config.fetch(:service)).build(**config, configurator: self)
+  end
+
+  private
+    def config_for(name)
+      configurations.fetch name do
+        raise "Missing configuration for the #{name.inspect} Active Storage service. Configurations available for #{configurations.keys.inspect}"
+      end
+    end
+
+    def resolve(class_name)
+      require "active_storage/service/#{class_name.to_s.underscore}_service"
+      ActiveStorage::Service.const_get(:"#{class_name}Service")
+    end
+end