Freeze redirection middleware configuration.

lib/utopia/redirection/directory_index.rb

@@ -18,6 +18,16 @@ def initialize(app, index: "index")
 				super(app)
 			end
 
+			# Freeze this object and its internal state.
+			# @returns [self] This object.
+			def freeze
+				return self if frozen?
+
+				@index.freeze
+
+				return super
+			end
+
 			# Redirect a directory path to its index path.
 			# @parameter path [String] The normalized request path.
 			# @returns [Protocol::HTTP::Response | Nil] The redirect response when the path ends with `/`.

lib/utopia/redirection/moved.rb

@@ -23,6 +23,18 @@ def initialize(app, pattern, prefix, status: 301, flatten: false)
 				super(app, status: status)
 			end
 
+			# Freeze this object and its internal state.
+			# @returns [self] This object.
+			def freeze
+				return self if frozen?
+
+				@pattern.freeze
+				@prefix.freeze
+				@flatten.freeze
+
+				return super
+			end
+
 			# Redirect a matching path to the configured prefix.
 			# @parameter path [String] The normalized request path.
 			# @returns [Protocol::HTTP::Response | Nil] The redirect response when the pattern matches.

lib/utopia/redirection/rewrite.rb

@@ -19,6 +19,16 @@ def initialize(app, patterns, status: 301)
 				super(app, status: status)
 			end
 
+			# Freeze this object and its internal state.
+			# @returns [self] This object.
+			def freeze
+				return self if frozen?
+
+				@patterns.freeze
+
+				return super
+			end
+
 			# Redirect a path found in the rewrite map.
 			# @parameter path [String] The normalized request path.
 			# @returns [Protocol::HTTP::Response | Nil] The redirect response when the path is mapped.

test/utopia/redirection.rb

@@ -21,6 +21,38 @@ def tracked_body(name, events)
 		return body
 	end
 
+	it "freezes directory index configuration" do
+		index = +"index"
+		middleware = Utopia::Redirection::DirectoryIndex.new(Protocol::HTTP::Middleware::NotFound, index: index)
+
+		middleware.freeze
+
+		expect(middleware).to be(:frozen?)
+		expect(index).to be(:frozen?)
+	end
+
+	it "freezes rewrite configuration" do
+		patterns = {"/old" => "/new"}
+		middleware = Utopia::Redirection::Rewrite.new(Protocol::HTTP::Middleware::NotFound, patterns)
+
+		middleware.freeze
+
+		expect(middleware).to be(:frozen?)
+		expect(patterns).to be(:frozen?)
+	end
+
+	it "freezes moved configuration" do
+		pattern = +"/old"
+		prefix = +"/new"
+		middleware = Utopia::Redirection::Moved.new(Protocol::HTTP::Middleware::NotFound, pattern, prefix)
+
+		middleware.freeze
+
+		expect(middleware).to be(:frozen?)
+		expect(pattern).to be(:frozen?)
+		expect(prefix).to be(:frozen?)
+	end
+
 	let(:middleware) do
 		Utopia::Application.build(Protocol::HTTP::Middleware.for{|request|
 			case request.path_info