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module WhatDoTheyKnow
class StripEmptySessions
ENV_SESSION_KEY = "rack.session".freeze
HTTP_SET_COOKIE = "Set-Cookie".freeze
STRIPPABLE_KEYS = [:session_id, :_csrf_token, :locale]
def initialize(app, options = {})
@app = app
@options = options
end
def call(env)
status, headers, body = @app.call(env)
session_data = env[ENV_SESSION_KEY]
set_cookie = headers[HTTP_SET_COOKIE]
if session_data
if (session_data.keys - STRIPPABLE_KEYS).empty?
if set_cookie.is_a? Array
set_cookie.reject! {|c| c.match(/^\n?#{@options[:key]}=/)}
elsif set_cookie.is_a? String
headers[HTTP_SET_COOKIE].gsub!( /(^|\n)#{@options[:key]}=.*?(\n|$)/, "" )
end
end
end
[status, headers, body]
end
end
end
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