Converted to a gem.

.document

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+README.rdoc
+lib/**/*.rb
+bin/*
+features/**/*.feature
+LICENSE

.gitignore

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+*.sw?
+.DS_Store
+coverage
+rdoc
+pkg

LICENSE

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+Copyright (c) 2009 Tyler Hunt
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.rdoc

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+= Canonical Host
+
+Canonical Host is a bit of Rack middleware that lets you define a single host
+as the canonical host for your site, and redirect all other hostnames to that
+canonical host.
+
+In the simplest case, just specify the host name and any requests coming in
+that aren't for the host example.com will be rewritten with the proper host.
+
+    use CanonicalHost, 'example.com'
+
+You could also define a constant in your environment-specific configuration
+files to set up a canonical host redirect for only certain environments.
+
+    CANONICAL_HOST = 'example.com'
+
+Then, you can set up the middle are like this.
+
+    use CanonicalHost, CANONICAL_HOST if defined?(CANONICAL_HOST)
+
+Alternatively, you can pass a block whose return value will be used to set the
+canonical host.
+
+    use CanonicalHost do
+      case ENV['RACK_ENV'].to_sym
+        when :staging then 'example.com'
+        when :production then 'staging.example.com'
+      end
+    end
+
+
+Copyright (c) 2009 Tyler Hunt. See LICENSE for details.

Rakefile

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+require 'rubygems'
+require 'rake'
+require 'rake/rdoctask'
+
+begin
+  require 'jeweler'
+
+  Jeweler::Tasks.new do |gem|
+    gem.name = 'rack-canonical-host'
+    gem.summary = %Q{Rack middleware for defining a canonical host name.}
+    gem.description = %Q{Rack middleware for defining a canonical host name. It will redirect all requests to non-canonical hosts to the canonical host.}
+    gem.email = 'tyler@tylerhunt.com'
+    gem.homepage = 'http://github.com/tylerhunt/rack-canonical-host'
+    gem.authors = ['Tyler Hunt']
+  end
+
+  Jeweler::GemcutterTasks.new
+rescue LoadError
+  puts 'Jeweler (or a dependency) not available. Install it with: sudo gem install jeweler'
+end
+
+Rake::RDocTask.new do |rdoc|
+  if File.exist?('VERSION')
+    version = File.read('VERSION')
+  else
+    version = ''
+  end
+
+  rdoc.rdoc_dir = 'rdoc'
+  rdoc.title = "rack-canonical-host #{version}"
+  rdoc.rdoc_files.include('README*')
+  rdoc.rdoc_files.include('LICENSE')
+  rdoc.rdoc_files.include('lib/**/*.rb')
+end

VERSION

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+0.0.1

lib/canonical-host.rb

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+module Rack # :nodoc:
+  class CanonicalHost
+    def initialize(app, host=nil, &block)
+      @app = app
+      @host = (block_given? && block.call) || host
+    end
+
+    def call(env)
+      if url = url(env)
+        [301, { 'Location' => url }, ['Redirecting...']]
+      else
+        @app.call(env)
+      end
+    end
+
+    def url(env)
+      if @host && env['SERVER_NAME'] != @host
+        url = Rack::Request.new(env).url
+        url.sub(%r{\A(https?://)(.*?)(:\d+)?(/|$)}, "\\1#{@host}\\3/")
+      end
+    end
+    private :url
+  end
+end