71 lines
2.5 KiB
Ruby
71 lines
2.5 KiB
Ruby
# Copyright (c) 2010-2011, Diaspora Inc. This file is
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# licensed under the Affero General Public License version 3 or later. See
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# the COPYRIGHT file.
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module Rack
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class ChromeFrame
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def initialize(app, options={})
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@app = app
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@options = options
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end
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def call(env)
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if env['HTTP_USER_AGENT'] =~ /MSIE/
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if env['HTTP_USER_AGENT'] =~ /chromeframe/
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status, headers, response = @app.call(env)
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new_body = insert_tag(build_response_body(response))
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new_headers = recalculate_body_length(headers, new_body)
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return [status, new_headers, [new_body]]
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elsif @options[:minimum].nil? or ie_version(env['HTTP_USER_AGENT']) < @options[:minimum]
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html = <<-HTML
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
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<head>
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<meta http-equiv="content-type" content="text/html;charset=UTF-8" />
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<title>Diaspora doesn't support your version of Internet Explorer. Try Chrome, Firefox, or Opera!</title>
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</head>
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<body>
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<div id="cf-placeholder"></div>
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<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/chrome-frame/1/CFInstall.min.js"></script>
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<script>CFInstall.check({ node: "cf-placeholder" #{', destination: "' + @options[:destination] + '" ' if @options[:destination]}});</script>
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</body>
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</html>
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HTML
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return [200, {'Content-Type' => 'text/html', 'Content-Length' => html.size.to_s}, Rack::Response.new([html])]
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end
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end
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@app.call(env)
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end
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def build_response_body(response)
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response_body = ""
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response.each { |part| response_body += part }
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# see: http://johnbintz.github.com/blog/2012/03/05/closing-given-body-in-rack-middleware/
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response.close if response.respond_to?(:close)
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response_body
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end
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def recalculate_body_length(headers, body)
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new_headers = headers
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new_headers["Content-Length"] = body.length.to_s
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new_headers
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end
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def insert_tag(body)
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head = <<-HEAD
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<meta http-equiv="X-UA-Compatible" content="chrome=1">
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HEAD
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body.gsub!(/<head(.*)>/, "<head\\1>\n" + head )
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body
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end
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def ie_version(ua_string)
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ua_string.match(/MSIE ?(\S+)/)[1].to_f
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end
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end
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end
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