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@tylerhunt
Created October 9, 2009 18:03
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Rack middleware that redirects requests to a canonical host.
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
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