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# Copyright (c) 2010, Diaspora Inc. This file is
# licensed under the Affero General Public License version 3 or later. See
# the COPYRIGHT file.
module Rack
class ChromeFrame
def initialize(app, options={})
@app = app
@options = options
end
def call(env)
if env['HTTP_USER_AGENT'] =~ /MSIE/
if env['HTTP_USER_AGENT'] =~ /chromeframe/
status, headers, response = @app.call(env)
new_body = insert_tag(build_response_body(response))
new_headers = recalculate_body_length(headers, new_body)
return [status, new_headers, new_body]
elsif @options[:minimum].nil? or ie_version(env['HTTP_USER_AGENT']) < @options[:minimum]
html = <<-HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<meta http-equiv="content-type" content="text/html;charset=UTF-8" />
<title>Diaspora doesn't support your version of Internet Explorer. Try Chrome, Firefox, or Opera!</title>
</head>
<body>
<div id="cf-placeholder"></div>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/chrome-frame/1/CFInstall.min.js"></script>
<script>CFInstall.check({ node: "cf-placx eholder" #{', destination: "' + @options[:destination] + '" ' if @options[:destination]}});</script>
</body>
</html>
HTML
return [200, {'Content-Type' => 'text/html', 'Content-Length' => html.size.to_s}, Rack::Response.new([html])]
end
end
@app.call(env)
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_tag(body)
head = <<-HEAD
<meta http-equiv="X-UA-Compatible" content="chrome=1">
HEAD
body.gsub!('<head>', "<head>\n" + head )
body
end
def ie_version(ua_string)
ua_string.match(/MSIE (\S+)/)[1].to_f
end
end
end
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