Flickr and Twitter filters using oEmbed and JSON

lib/auto_html/filters/flickr.rb

@@ -0,0 +1,20 @@
+require 'uri'
+require 'net/http'
+require 'rexml/document'
+
+AutoHtml.add_filter(:flickr).with(:maxwidth => nil, :maxheight => nil, :link_options => {}) do |text, options|
+  regex = %r{http://(www\.)?flickr\.com/photos/[^\s<]*}
+
+  text.gsub(regex) do |match|
+    params = { :url => match, :format => "json" }
+    [:maxwidth, :maxheight].each { |p| params[p] = options[p] unless options[p].nil? or not options[p] > 0 }
+
+    uri = URI("http://www.flickr.com/services/oembed")
+    uri.query = URI.encode_www_form(params)
+
+    response = JSON.parse(Net::HTTP.get(uri))
+
+    link_options = Array(options[:link_options]).reject { |k,v| v.nil? }.map { |k, v| %{#{k}="#{REXML::Text::normalize(v)}"} }.join(' ')
+    %{<a href="#{match}"#{ ' ' + link_options unless link_options.empty? }><img src="#{response["url"]}" alt="#{response["title"]}" title="#{response["title"]}" /></a>}
+  end
+end

lib/auto_html/filters/twitter.rb

@@ -0,0 +1,16 @@
+require 'uri'
+require 'net/http'
+
+AutoHtml.add_filter(:twitter).with({}) do |text, options|
+  regex = %r{https://twitter\.com(/#!)?/[A-Za-z0-9_]{1,15}/status(es)?/\d+}
+
+  text.gsub(regex) do |match|
+    params = { :url => match }.merge(options)
+
+    uri = URI("http://api.twitter.com/1/statuses/oembed.json")
+    uri.query = URI.encode_www_form(params)
+
+    response = JSON.parse(Net::HTTP.get(uri))
+    response["html"]
+  end
+end