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module Rack
# Bounces or redirects requests to missing static files.
# Partially inspired by [http://menendez.com/blog/using-django-as-pass-through-image-proxy/](http://menendez.com/blog/using-django-as-pass-through-image-proxy/)
#
# I.e. could be useful when you want to run the server with production database locally
# and have user uploaded content fetched transparently from production site.
#
# Options:
# :mode - [ :off,
# :bounce, # returns 404 to any request to static URL,
# :fallback ] # any request to static path is redirected to :fallback_static_url
# :static_path_regex - Regexp which matches the path to your static files.
# Along the lines of the Capistrano conventions defaults to `%r{/system/(audios|photos|videos)}`
# :fallback_static_url - URL of the production site
#
# To use with Rails install as a plugin:
#
# script/plugin install git://github.com/dolzenko/rack-static_fallback.git
#
# then add the following to your `config/environments/development.rb`
#
# config.middleware.insert_after ::Rack::Lock,
# ::Rack::StaticFallback, :mode => :fallback,
# :static_path_regex => %r{/system/uploads},
# :fallback_static_url => "http://myproductionsite.com/"
#
class StaticFallback
def initialize(app, options = {})
@app = app
@mode = options[:mode] || :off
# along the lines of the Capistrano defaults
@static_path_regex = options[:static_path_regex] || %r{/system/(audios|photos|videos)}
@fallback_static_url = options[:fallback_static_url]
end
def call(env)
if env["PATH_INFO"] =~ @static_path_regex
# If we get here that means that underlying web server wasn't able to serve the static file,
# i.e. it wasn't found.
case @mode
when :off
# pass the request to next middleware, ultimately Rails
@app.call(env)
when :bounce
# don't pass the request so that it doesn't hit framework, which
# speeds up things significantly
not_found
when :fallback
if @fallback_static_url
# redirect request to the production server
[ 302, { "Location" => ::File.join(@fallback_static_url, env["PATH_INFO"]) }, [] ]
else
ActionController::Base.logger.debug "You're using StaticFallback middleware with StaticFallback.mode set to :fallback " <<
"however StaticFallback.fallback_static_url has not been set."
not_found
end
end
else
@app.call(env)
end
end
def not_found
[ 404, { "Content-Type" => "text/html", "Content-Length" => "0" }, [] ]
end
end
end
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