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 7

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 5

def config
  @config
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/rack_resize/rack_app.rb', line 17

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

  RackResize::InputParsers::Cloudflare.parse_input(fullpath, cf_path_prefix: @cf_path_prefix) =>
    {route_matched:, req_params:, asset_path:}

  return @app.call(env) unless route_matched
  return error_resp("can't parse file path") unless asset_path

  return error_resp("no assets folders configured") if config.assets_folders.nil? || config.assets_folders.empty?

  has_matched = false
  asset_file = nil
  config.assets_folders.each do |prefix, folder|
    if asset_path.start_with?(prefix)
      asset_file = folder.join(asset_path.delete_prefix(prefix + (prefix.end_with?("/") ? "" : "/")))
      if asset_file.expand_path.to_s.start_with?(folder.to_s)
        has_matched = true
      end
      break
    end
  end

  if asset_path.include?("..")
    @processing.logger.info("RackResize::RackApp - File path has invalid byte sequence #{asset_path}")
    return error_resp(".. is not allowed in image path")
  end
  unless has_matched
    @processing.logger.info("RackResize::RackApp - requested file #{asset_path} not match any of configured assets folder #{config.assets_folders.keys}")
    return error_resp("invalid file path")
  end
  unless asset_file.exist?
    @processing.logger.info("RackResize::RackApp - File path fond #{asset_path} => #{asset_file}")
    return error_resp("file not exists on a server")
  end

  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 58

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 62

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