1 files changed, 50 insertions, 0 deletions
diff --git a/lib/gitlab/ci/config/external/processor.rb b/lib/gitlab/ci/config/external/processor.rb
new file mode 100644
index 00000000000..eae0bdeb644
--- /dev/null
+++ b/lib/gitlab/ci/config/external/processor.rb
@@ -0,0 +1,50 @@
+# frozen_string_literal: true
+
+module Gitlab
+  module Ci
+    class Config
+      module External
+        class Processor
+          IncludeError = Class.new(StandardError)
+
+          def initialize(values, project, sha)
+            @values = values
+            @external_files = External::Mapper.new(values, project, sha).process
+            @content = {}
+          end
+
+          def perform
+            return @values if @external_files.empty?
+
+            validate_external_files!
+            merge_external_files!
+            append_inline_content!
+            remove_include_keyword!
+          end
+
+          private
+
+          def validate_external_files!
+            @external_files.each do |file|
+              raise IncludeError, file.error_message unless file.valid?
+            end
+          end
+
+          def merge_external_files!
+            @external_files.each do |file|
+              @content.deep_merge!(file.to_hash)
+            end
+          end
+
+          def append_inline_content!
+            @content.deep_merge!(@values)
+          end
+
+          def remove_include_keyword!
+            @content.tap { @content.delete(:include) }
+          end
+        end
+      end
+    end
+  end
+end