Google PageRank Ruby Checker

sevkin (Vsevolod Balashov) — Mon, 15 Jan 2007 15:59:31 GMT


#!/usr/bin/env ruby

# -*- coding: utf-8 -*-

# $Id: google-pr.rb,v b205c14e4ef5 2007-01-15 13:53 +0300 $

# (C) 2006-2007 under terms of LGPL v2.1 

# by Vsevolod S. Balashov 

# based on 3rd party code snippets (see comments)



require 'uri'

require 'open-uri'



module SEO



  # http://blog.outer-court.com/archive/2004_06_27_index.html#108834386239051706

  class GooglePR



    def initialize(uri)

      @uri = uri

    end



    M=0x100000000 # modulo for unsigned int 32bit(4byte)



    def m1(a,b,c,d)

      (((a+(M-b)+(M-c))%M)^(d%M))%M # mix/power mod

    end



    def i2c(i)

      [i&0xff, i>>8&0xff, i>>16&0xff, i>>24&0xff]

    end



    def c2i(s,k=0)

      ((s[k+3].to_i*0x100+s[k+2].to_i)*0x100+s[k+1].to_i)*0x100+s[k].to_i

    end



    def mix(a,b,c)

      a = a%M; b = b%M; c = c%M

      a = m1(a,b,c, c >> 13); b = m1(b,c,a, a <<  8); c = m1(c,a,b, b >> 13)

      a = m1(a,b,c, c >> 12); b = m1(b,c,a, a << 16); c = m1(c,a,b, b >>  5)

      a = m1(a,b,c, c >>  3); b = m1(b,c,a, a << 10); c = m1(c,a,b, b >> 15)

      [a, b, c]

    end



    def old_cn(iurl = 'info:' + @uri)

      a = 0x9E3779B9; b = 0x9E3779B9; c = 0xE6359A60

      len = iurl.size 

      k = 0

      while (len >= k + 12) do

        a += c2i(iurl,k); b += c2i(iurl,k+4); c += c2i(iurl,k+8)

        a, b, c = mix(a, b, c)

        k = k + 12

      end

      a += c2i(iurl,k); b += c2i(iurl,k+4); c += (c2i(iurl,k+8) << 8) + len

      a,b,c = mix(a,b,c)

      return c

    end



    def cn

      ch = old_cn

      ch = ((ch/7) << 2) | ((ch-(ch/13).floor*13)&7)

      new_url = []

      20.times { i2c(ch).each { |i| new_url << i }; ch -= 9 }

      ('6' + old_cn(new_url).to_s).to_i

    end



    def request_uri

      # http://www.bigbold.com/snippets/posts/show/1260 + _ -> %5F

      "http://toolbarqueries.google.com/search?client=navclient-auto&hl=en&ch=#{cn}&ie=UTF-8&oe=UTF-8&features=Rank&q=info:#{URI.escape(@uri, /[^-.!~*'()a-zA-Z\d]/)}"

    end

 

    def page_rank(uri = @uri)

      @uri = uri if uri != @uri

      open(request_uri) { |f| return $1.to_i if f.string =~ /Rank_1:\d:(\d+)/ }

      nil

    end



    private :m1, :i2c, :c2i, :mix, :old_cn

    attr_accessor :uri

  end



end



if __FILE__ == $0 and 1 == ARGV.size

  puts SEO::GooglePR.new(ARGV[0]).page_rank

end
DZone Snippets: pagerank code

Google PageRank Ruby Checker
