google.rb in seo_info-0.0.2

- old
+ new

@@ -1,5 +1,7 @@
+require 'cgi'
+
 module SeoInfo
   class Google
     attr_accessor :site_url
     attr_reader :results
 
@@ -8,16 +10,70 @@
       @results = {}
     end
 
     def indexed_pages
       results[:indexed_pages] ||= begin
-        page = Nokogiri::HTML(get_page)
+        page = Nokogiri::HTML(indexed_pages_page)
         page.xpath('//div[@id="subform_ctrl"]/div/b/text()')[2].text.gsub(/[^\d]/,'').to_i
       end
     end
 
+    def page_rank
+      page_rank_page.split(':').last.to_i rescue nil
+    end
+
     private
-    def get_page
+    def indexed_pages_page
       open("https://www.google.com/search?hl=en&safe=off&q=site%3A#{site_url}&btnG=Search").read
+    end
+
+    def page_rank_page
+      open("http://toolbarqueries.google.com/tbr?client=navclient-auto&ch=#{checksum(site_url)}&ie=UTF-8&oe=UTF-8&features=Rank&q=info:#{CGI::escape(site_url)}").read
+    end
+
+    def checksum(str)
+      check1 = str_to_num(str, 0x1505, 0x21)
+      check2 = str_to_num(str, 0, 0x1003F)
+      check1 >>= 2
+      check1 = ((check1 >> 4) & 0x3FFFFC0) | (check1 & 0x3F)
+      check1 = ((check1 >> 4) & 0x3FFC00) | (check1 & 0x3FF)
+      check1 = ((check1 >> 4) & 0x3C000) | (check1 & 0x3FFF)
+      t1 = ((((check1 & 0x3C0) << 4) | (check1 & 0x3C)) << 2) | (check2 & 0xF0F)
+      t2 = ((((check1 & 0xFFFFC000) << 4) | (check1 & 0x3C00)) << 0xA) | (check2 & 0xF0F0000)
+      hash = (t1 | t2)
+      check_byte = 0
+      flag = 0
+      hash_str = sprintf('%u', hash)
+      (hash_str.size - 1).downto(0) do |i|
+        re = hash_str[i..i].to_i
+        if (1 == (flag % 2))
+          re += re
+          re = (re / 10).to_i + (re % 10)
+        end
+        check_byte += re
+        flag += 1
+      end
+      check_byte %= 10
+      if (0 != check_byte)
+        check_byte = 10 - check_byte
+        if (1 == (flag % 2))
+          check_byte += 9 if (1 == (check_byte % 2))
+          check_byte >>= 1
+        end
+      end
+      return '7' + check_byte.to_s + hash_str;
+    end
+
+    def str_to_num(str, check, magic)
+      int32 = 4294967296 # 2^32
+      str.each_byte do |char|
+        check *= magic
+        if check >= int32
+          check = (check - int32 * (check / int32).to_i)
+          check = (check < -2147483648) ? check + int32 : check
+        end
+        check += char
+      end
+      return check
     end
   end
 end
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