mudge · August 2, 2016 11:35
diff --git a/microsoft_hyperlink_library_middleware.rb b/microsoft_hyperlink_library_middleware.rb
 # If you're using Rails, add this file to app/middleware/microsoft_hyperlink_library_middleware.rb
 # And add the following to your config/application.rb (note the string class name):
 #
 #     config.middleware.use "MicrosoftHyperlinkLibraryMiddleware"
 #
 # This will fix the awful bug described in https://support.microsoft.com/en-gb/kb/899927 where
 # links from PowerPoint or Word that require an authenticated session continually go to your
 # log in page even when a user is authenticated.
 #
 # The workaround is to rewrite any server-side HTTP redirects to client-side redirects
 # using the <meta http-equiv="refresh"> tag for any requests from Microsoft Office products.

 class MicrosoftHyperlinkLibraryMiddleware
  attr_reader :app

  def initialize(app)
    @app = app
  end

  def call(env)
    status, header, body = app.call(env)
    return meta_refresh(header) if redirect?(status) && microsoft_office_request?(env)

    [status, header, body]
  end

  private

  def redirect?(status)
    status >= 300 && status < 400
  end

  def microsoft_office_request?(env)
    request = Rack::Request.new(env)
    user_agent = request.user_agent.to_s

    user_agent.include?(' PowerPoint/') || user_agent.include?(' Word/')
  end

  def meta_refresh(header)
    url = header['Location']

    [
      200,
      { 'Content-Type' => 'text/html' },
      [%(<!DOCTYPE html><title>Refresh</title><meta http-equiv="refresh" content="0; url=#{url}">)]
    ]
  end
 end
	# If you're using Rails, add this file to app/middleware/microsoft_hyperlink_library_middleware.rb
	# And add the following to your config/application.rb (note the string class name):
	#
	# config.middleware.use "MicrosoftHyperlinkLibraryMiddleware"
	#
	# This will fix the awful bug described in https://support.microsoft.com/en-gb/kb/899927 where
	# links from PowerPoint or Word that require an authenticated session continually go to your
	# log in page even when a user is authenticated.
	#
	# The workaround is to rewrite any server-side HTTP redirects to client-side redirects
	# using the <meta http-equiv="refresh"> tag for any requests from Microsoft Office products.

	class MicrosoftHyperlinkLibraryMiddleware
	attr_reader :app

	def initialize(app)
	@app = app
	end

	def call(env)
	status, header, body = app.call(env)
	return meta_refresh(header) if redirect?(status) && microsoft_office_request?(env)

	[status, header, body]
	end

	private

	def redirect?(status)
	status >= 300 && status < 400
	end

	def microsoft_office_request?(env)
	request = Rack::Request.new(env)
	user_agent = request.user_agent.to_s

	user_agent.include?(' PowerPoint/') \|\| user_agent.include?(' Word/')
	end

	def meta_refresh(header)
	url = header['Location']

	[
	200,
	{ 'Content-Type' => 'text/html' },
	[%(<!DOCTYPE html><title>Refresh</title><meta http-equiv="refresh" content="0; url=#{url}">)]
	]
	end
	end