Class: RackResize::RackApp

Inherits:
Object
  • Object
show all
Defined in:
lib/rack_resize/rack_app.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(*args, **options) ⇒ RackApp

Returns a new instance of RackApp.



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# File 'lib/rack_resize/rack_app.rb', line 9

def initialize(*args, **options)
  if args.first
    @app = args.first
  end

  @config = options == {} ? RackResize.config : RackResize::Configuration.new(options)
  @processing = RackResize::Processing.new(config: @config)
  @cf_path_prefix = options[:cf_path_prefix] || "/cdn-cgi/image"
end

Instance Attribute Details

#config ⇒ Object (readonly)

Returns the value of attribute config.



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# File 'lib/rack_resize/rack_app.rb', line 7

def config
  @config
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/rack_resize/rack_app.rb', line 19

def call(env)
  request = Rack::Request.new(env)
  fullpath = request.path_info

  unless fullpath.start_with?(@cf_path_prefix)
    return @app.call(env)
  end

  # process string like this
  # /cdn-cgi/image/width=426,format=auto/assets/templates/vancouver-27c47f55.jpg

  fullpath = fullpath.delete_prefix("/cdn-cgi").delete_prefix("/image").delete_prefix("/")
  file_path_match = fullpath.match(%r{(?<params>[^\/]+)(?<file>\/.+?)(-[\da-f]{8})?(?<ext>\.\w{2,})$})

  return error_resp("can't parse file path") unless file_path_match

  req_params = file_path_match[:params].split(",").map {|s| s.split("=") }.to_h.transform_keys(&:to_sym)
  asset_path = "#{file_path_match[:file]}#{file_path_match[:ext]}"

  if defined?(Rails)
    asset_path = asset_path.delete_prefix("/assets/")
  else
    asset_path = asset_path.delete_prefix("/#{config.assets_folder}/")
  end

  asset_file = config.assets_folder.join(asset_path.sub(%r{^/assets/}, ''))

  return error_resp(".. is not allowed in image path") if asset_path.include?("..")

  return error_resp("invalid file path") unless asset_file.to_s.start_with?(config.assets_folder.to_s)
  return error_resp("file not exists on a server") unless asset_file.exist?

  file_content = @processing.process!(source_file: asset_file, req_params:)
  return send_file(asset_file:, file_content:)
end

#error_resp(message, http_code: 404) ⇒ Object 



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# File 'lib/rack_resize/rack_app.rb', line 55

def error_resp(message, http_code: 404)
  [http_code, {}, [message]]
end

#send_file(asset_file:, file_content: nil) ⇒ Object 



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# File 'lib/rack_resize/rack_app.rb', line 59

def send_file(asset_file:, file_content: nil)
  content_type = Rack::Mime.mime_type(File.extname(asset_file), "application/octet-stream")

  [
    200,
    {
      "content-type"        => content_type,
      "content-length"      => file_content.size.to_s,
      "content-disposition" => "inline",
      "cache-control"       => "max-age=#{config.http_cache_max_age}" # 1 day
    },
    file_content
  ]
end