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require 'digest/md5'
module Rack
# Automatically sets the ETag header on all String bodies
class ETag
def initialize(app)
@app = app
end
def call(env)
status, headers, body = @app.call(env)
if !headers.has_key?('ETag')
parts = []
body.each { |part| parts << part.to_s }
headers['ETag'] = %("#{Digest::MD5.hexdigest(parts.join(""))}")
[status, headers, parts]
else
[status, headers, body]
end
end
end
end
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