├── Gemfile
├── Gemfile.lock
├── config.ru
└── README.md


/Gemfile:
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1 | source 'https://rubygems.org'
2 | 
3 | gem 'rack'
4 | gem 'rack-rewrite'


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/Gemfile.lock:
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 1 | GEM
 2 |   remote: https://rubygems.org/
 3 |   specs:
 4 |     rack (1.5.2)
 5 |     rack-rewrite (1.3.3)
 6 | 
 7 | PLATFORMS
 8 |   ruby
 9 | 
10 | DEPENDENCIES
11 |   rack
12 |   rack-rewrite
13 | 


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/config.ru:
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 1 | require 'rack/rewrite'
 2 | 
 3 | # Expects ENV['REDIRECTS'] to be a ruby hash of source hostnames to destination hostnames. E.g.:
 4 | #   "{'old.domain.com' => 'new.domain.com'}"
 5 | REDIRECTS = eval(ENV['REDIRECTS'] || '') || {}
 6 | 
 7 | use Rack::Rewrite do
 8 | 
 9 |   REDIRECTS.each do |from, to|
10 |     r301 %r{.*}, "http://#{to}$&", if: -> (env) { env['SERVER_NAME'] == from }
11 |   end
12 |   
13 | end
14 | 
15 | # Fall back to default app (empty).
16 | run -> (env) { [200, {}, []] }


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/README.md:
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 1 | # Rerouter
 2 | 
 3 | A minimal, rack-based domain-redirecter. Generates 301 redirects from a set of source hostnames to their corresponding destination hostnames while preserving paths and querystrings.
 4 | 
 5 | ## Steps for setting up your own rerouter on Heroku:
 6 | 
 7 |     git clone https://github.com/joeyAghion/rerouter.git
 8 |     cd rerouter
 9 |     gem install heroku
10 |     heroku apps:create
11 |     git push heroku master
12 |     heroku config:set REDIRECTS="{'old.domain.com'=>'new.domain.com'}"
13 |     heroku domains:add old.domain.com
14 | 
15 | Then, update the DNS of `old.domain.com` to be a CNAME pointing to the new heroku app.
16 | 


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