lib/scrapers/xkcd.rb in scrapers-0.4.0 vs lib/scrapers/xkcd.rb in scrapers-0.4.1

@@ -2,22 +2,55 @@
 require 'nokogiri'
 
 module Scrapers
   module Xkcd
     XKCD_URL = "http://xkcd.com"
+    PUBDATE_FORMAT = "%F"
+
+    # Get the current or numbered xkcd comic
+    #
+    # +comic+ = (string) the number of the xkcd comic to
+    #retreive. Gets current comic if nil.
+    #
+    # returns hash containing comic info:
+    #
+    #      {:title => "comic' title",
+    #       :url => "url to comic",
+    #       :img_src => "source url to comic image",
+    #       :hover_text => "the hover (mouse-over) text",
+    #       :pubdate => "publication date",
+    #      }
+    #
     def self.scrape(comic=nil)
       results = Hash.new
 
       url = URI.parse XKCD_URL
       url.path = "/#{comic}/" unless comic.nil?
       results[:url] = url.to_s
+
       doc = Nokogiri::HTML(open(url.to_s))
       comic = doc.at_css("#comic img")
       results[:img_src] = comic.attr("src")
       results[:hover_text] = comic.attr("title")
       results[:title] = comic.attr("alt")
+      results[:pubdate] = get_pubdate(results[:img_src])
 
       results
+    end
+
+    # Get the http header of the image file which reveals the last_modified date.
+    # We'll use this as the publication date.
+    def self.get_pubdate(url)
+      url = URI.parse(url.dup)
+      head_req = Net::HTTP::Head.new url
+      
+      head = Net::HTTP.start(url.host, url.port) do |http|
+        http.request head_req
+      end
+      return Time.now.strftime(PUBDATE_FORMAT) if head["Last-Modified"].nil?
+      last_modified = Time.parse(head["Last-Modified"]) rescue nil
+      return Time.now.strftime(PUBDATE_FORMAT) if last_modified.nil?
+      last_modified.strftime(PUBDATE_FORMAT)
     end
     
   end
 end