gistfile1.txt

class ShortUrlsController < ActionController::Base
  
  # before_filter :login_required
  
  def index
    @urls = Url.paginate :page => params[:page], :per_page => 4, :order => 'updated_at DESC'
  end
  
  def create_link
    @url = Url.new(:long_url => params['url'])
    @url.save!
    @url = Url.find_by_long_url(@url.long_url)
    # render :text => 'http://localhost:3000/' + @url.short_url
    #render :template => 'short_urls/index'
  end
  
  def redirect_to_original
    @url = Url.find_by_id(from_64(params['short_url']))
    redirect_to @url.long_url
  end
  
  def test_url_shortener
    render :template => 'short_url/test_form'
  end 
  
  private
  
  def from_64(s)
    tot = 0
    s.split('').reverse.each_with_index do |c, place|
      n = Url::VALID_BASE64_CHARS.index(c)
      tot += (n * (64 ** place))
    end
    tot
  end
  
end

gistfile2.txt

<h1>Url Listing</h1>

<table padding = 2px>
	<tr>
		<td><center><b>long url</b></center></td>
		<td><center><b>short url</b></center></td>
	</tr>
<% for url in @urls %>
	<tr>
		<td align = "center">
			<a href = "<%=h url.long_url %>"> <%=h url.long_url %> </a>
		</td>
		<td align = "center">
			<a href = "http://localhost:3000/<%=h url.short_url %>"> <%=h url.short_url %> </a>
		</td>
	</tr>
<% end %>
<tr>
	<td colspan = '2', align = "center"><%= will_paginate @urls %></td>
</tr>
</table>
<br />
<br />
<%= link_to 'New Url to be Shortened', new_short_url_path %>