Redirector - A simple rack application which makes redirection of multiple domains a breeze

The last couple of months I have been dabbling in all kinds of Ruby web frameworks. The choice of web frameworks in ruby is really amazing.

The other day, I had registered a couple of domains for one of my projects. And, I wanted to setup redirects of the ‘*.org’ and ‘*.net’ domains to the ‘*.com’ domain. I searched around a bit to see if there was a simple way to do this. But, I didn’t find any simple solution. If I hadn’t known any ruby frameworks, I would have hacked a bunch of php files and would have setup directories for each of the redirects. But, I have been digging ruby for a while now, and I am lovin’ it :)

So, I thought I could use rack to build a small app which would redirect domains based on a configuration file. The initial code I came up with was very simple. Below are the contents of the config.ru file

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app = proc do |env|
[302, {'Content-Type' => 'text','Location' => 'cosmicvent.com'}, ['302 found'] ]
end
run app

Just four lines of code to get our redirect stuff working! All I had to do now was to somehow get the status, and location of redirects through some configuration file. I fired up irb and played around with yaml a bit. It’s a child’s play to get yaml working with ruby. The final code looks something like below:

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#config.ru:
require File.join(File.dirname(__FILE__), 'lib/redirector')
use Rack::ContentLength
use Debugger, false
app = proc do |env|
app = Redirector.new()
status, headers, response = app.call(env)
[ status, headers, response ]
end
run app
#lib/redirector.rb:
require 'yaml'
class Redirector
@@config = YAML::load(File.open('config.yaml'))
def self.config
@@config
end
def call(env)
host_config = get_host_config(env['HTTP_HOST'])
[host_config['status'], {'Content-Type' => 'text','Location' => host_config['location']}, get_host_response( host_config ) ]
end
private
def get_host_response(host_config)
"#{host_config['status']} moved. The document has moved to #{host_config['location']}"
end
def get_host_config(host)
return @@config[host] if @@config[host]
raise "Configuration for #{host} not available"
end
end
class Debugger
def initialize(app, debug)
@app = app
@debug = debug
end
def call(env)
if @debug
puts '==== Config information ===='
puts Redirector.config.inspect
puts '============================'
end
@app.call(env)
end
end

That’s all, now all I had to do was set it up on my ubuntu server using ‘phusion passenger’. You can download all the code from http://github.com/minhajuddin/redirector. Below, is a part of my config.yaml file.

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cosmicvent.net:
status: 301
location: 'http://cosmicvent.com'
cosmicvent.org:
status: 301
location: 'http://cosmicvent.com'
www.cosmicvent.net:
status: 301
location: 'http://cosmicvent.com'
www.cosmicvent.org:
status: 301
location: 'http://cosmicvent.com'
www.cosmicvent.com:
status: 301
location: 'http://cosmicvent.com'

I am currently working on Zammu which makes Automatic Deployment of static websites to Github Pages very easy. I would love to get your feedback on it, Use the invitation code KHAJA