first attempt at a working surf bar proxy

app/surf.rb

@@ -15,3 +15,45 @@ get '/surf/:username' do |username|
   not_found if @site.nil?
   erb :'surf', layout: false
 end
+
+get %r{\/surf\/proxy\/([\w-]+)\/(.+)|\/surf\/proxy\/([\w-]+)\/?} do
+  captures = params[:captures].compact
+  username = captures.first
+  path = captures.length == 2 ? captures.last : ''
+
+  site = Site.where(username: username).select(:id, :username, :title, :domain).first
+  not_found if site.nil?
+
+  resp = RestClient.get "http://#{site.username}.neocities.org/#{path}"
+
+  content_type resp.headers[:content_type]
+  site_body = resp.body
+
+  unless path == '/' || path == '' || path.match(/\.html?$/i)
+    return site_body
+  end
+
+  attributes = ['src', 'href', 'background']
+
+  new_site_body = site_body.dup
+
+  site_body.gsub(/(?<name>\b\w+\b)\s*=\s*(?<value>"[^"]*"|'[^']*'|[^"'<>\s]+)/i) do |ele|
+    attributes.each do |attr|
+      if ele.match attr
+        uri = ele.match(/\"(.+)\"|\'(.+)\'/).captures.first
+
+        new_ele = nil
+
+        if uri.match /^\//
+          new_ele = ele.gsub(uri, "#{$config['surf_proxy_uri']}/surf/proxy/#{site.username}#{uri}")
+        elsif !uri.match /^\w+:\/\//
+          new_ele = ele.gsub(uri, "#{$config['surf_proxy_uri']}/surf/proxy/#{site.username}/#{uri}")
+        end
+
+        new_site_body.gsub! ele, new_ele if new_ele
+      end
+    end
+  end
+
+  new_site_body
+end