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@luigi
Created October 9, 2009 17:32
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module Rack
class ChromeFrame
def initialize(app, options={})
@app = app
end
def call(env)
status, headers, response = @app.call(env)
if env['HTTP_USER_AGENT'] =~ /MSIE/ && response.content_type == 'text/html'
new_body = insert_goods(build_response_body(response))
new_headers = recalculate_body_length(headers, new_body)
[status, new_headers, new_body]
else
[status, headers, response]
end
end
def build_response_body(response)
response_body = ""
response.each { |part| response_body += part }
response_body
end
def recalculate_body_length(headers, body)
new_headers = headers
new_headers["Content-Length"] = body.length.to_s
new_headers
end
def insert_goods(body)
head = <<-HEAD
<meta http-equiv="X-UA-Compatible" content="chrome=1">
HEAD
bod = <<-BOD
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/chrome-frame/1/CFInstall.min.js"></script>
<div id="cf-placeholder"></div>
<script>CFInstall.check({node: "cf-placeholder"});</script>
BOD
body.gsub!(/<\/head>/, head + "\n</head>")
body.gsub!(/<\/body>/, bod + "\n</body>")
body
end
end
end
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