postmodern/ban_hammer.rb

## ban_hammer.rb
require 'ipaddr'

module Rack
  #
  # BanHammer is a Rack middleware app that restricts access to your server
  # using a black-list of IPv4/IPv6 addresses and ranges.
  #
  # MIT License - Hal Brodigan (postmodern.mod3 at gmail.com)
  #
  class BanHammer

    DEFAULT_MESSAGE = %{
      <html>
        <head>
          <title>Banned</title>
        </head>
        <body>
          <h1>Banned</h1>

          <p>Your IP address has been banned by BanHammer. Please contact the site administrators for information on why you were banned.</p>
        </body>
      </html>
    }

    #
    # Initializes the ban hammer.
    #
    # @param [#call] app
    #   The Rack application to protect.
    #
    # @param [Hash] options
    #   Additional options.
    #
    # @option options [Array<String>] :banned ([])
    #   The list of IPv4/IPv6 addresses and netmasked ranges that are banned.
    #
    # @option options [String] :message ('')
    #   A message to display to those banned.
    #
    # @option options [String] :content_type ('text/html')
    #   The Content-Type of the ban message.
    #
    # @example
    #   use BanHammer, :banned => ['219.140.118.33/24'],
    #                  :message => %{
    #   <html>
    #     <head>
    #       <title>Banned</title>
    #     </head>
    #
    #     <body>
    #       <h1>Not even seven proxies can protect you from the BAN HAMMER.</h1>
    #     </body>
    #   </html>
    #   }
    #
    def initialize(app,options={})
      @app = app
      @banned = []

      if options[:banned]
        options[:banned].each do |ip|
          @banned << IPAddr.new(ip)
        end
      end

      @response = [
        403,
        {'Content-Type' => (options[:content_type] || 'text/html')},
        [options[:message] || DEFAULT_MESSAGE]
      ]
    end

    def call(env)
      remote_addr = IPAddr.new(env['REMOTE_ADDR'])

      @banned.each do |range|
        return @response if range.include?(remote_addr)
      end

      @app.call(env)
    end

  end
end
	require 'ipaddr'

	module Rack
	#
	# BanHammer is a Rack middleware app that restricts access to your server
	# using a black-list of IPv4/IPv6 addresses and ranges.
	#
	# MIT License - Hal Brodigan (postmodern.mod3 at gmail.com)
	#
	class BanHammer

	DEFAULT_MESSAGE = %{
	<html>
	<head>
	<title>Banned</title>
	</head>
	<body>
	<h1>Banned</h1>

	<p>Your IP address has been banned by BanHammer. Please contact the site administrators for information on why you were banned.</p>
	</body>
	</html>
	}

	#
	# Initializes the ban hammer.
	#
	# @param [#call] app
	# The Rack application to protect.
	#
	# @param [Hash] options
	# Additional options.
	#
	# @option options [Array<String>] :banned ([])
	# The list of IPv4/IPv6 addresses and netmasked ranges that are banned.
	#
	# @option options [String] :message ('')
	# A message to display to those banned.
	#
	# @option options [String] :content_type ('text/html')
	# The Content-Type of the ban message.
	#
	# @example
	# use BanHammer, :banned => ['219.140.118.33/24'],
	# :message => %{
	# <html>
	# <head>
	# <title>Banned</title>
	# </head>
	#
	# <body>
	# <h1>Not even seven proxies can protect you from the BAN HAMMER.</h1>
	# </body>
	# </html>
	# }
	#
	def initialize(app,options={})
	@app = app
	@banned = []

	if options[:banned]
	options[:banned].each do \|ip\|
	@banned << IPAddr.new(ip)
	end
	end

	@response = [
	403,
	{'Content-Type' => (options[:content_type] \|\| 'text/html')},
	[options[:message] \|\| DEFAULT_MESSAGE]
	]
	end

	def call(env)
	remote_addr = IPAddr.new(env['REMOTE_ADDR'])

	@banned.each do \|range\|
	return @response if range.include?(remote_addr)
	end

	@app.call(env)
	end

	end
	end