49 lines
1.3 KiB
Ruby
49 lines
1.3 KiB
Ruby
# frozen_string_literal: true
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require 'action_dispatch/middleware/static'
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class PublicFileServerMiddleware
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SERVICE_WORKER_TTL = 7.days.to_i
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CACHE_TTL = 28.days.to_i
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def initialize(app)
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@app = app
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@file_handler = ActionDispatch::FileHandler.new(Rails.application.paths['public'].first)
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end
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def call(env)
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file = @file_handler.attempt(env)
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# If the request is not a static file, move on!
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return @app.call(env) if file.nil?
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status, headers, response = file
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# Set cache headers on static files. Some paths require different cache headers
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headers['Cache-Control'] = begin
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request_path = env['REQUEST_PATH']
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if request_path.start_with?('/sw.js')
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"public, max-age=#{SERVICE_WORKER_TTL}, must-revalidate"
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elsif request_path.start_with?(paperclip_root_url)
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"public, max-age=#{CACHE_TTL}, immutable"
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else
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"public, max-age=#{CACHE_TTL}, must-revalidate"
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end
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end
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# Override the default CSP header set by the CSP middleware
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headers['Content-Security-Policy'] = "default-src 'none'; form-action 'none'" if request_path.start_with?(paperclip_root_url)
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headers['X-Content-Type-Options'] = 'nosniff'
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[status, headers, response]
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end
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private
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def paperclip_root_url
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ENV.fetch('PAPERCLIP_ROOT_URL', '/system')
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end
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end
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