Rake task to reset your Rails Application's secret token.

secret.rake

namespace :secret do

  desc "Replace application's secret_key_base in the secret_token initalizer with a new one"
  task :reset do
    # Rails default location
    @secret_token_file     ||= Rails.root.join('config', 'initializers', 'secret_token.rb')
    # Find first string in file
    @secret_token_finder ||= /(?<=config\.secret_key_base\s\=\s["'])(.*?)(?=["'])/

    File.open(@secret_token_file, 'r+') do |file|
      File.write file, file.read.gsub(@secret_token_finder, SecureRandom.hex(64))
    end

  end

  # Overridable:
  # namespace :reset do
  #   task :custom do
  #     @secret_token_file = Rails.root.join('config', 'secrets', 'app_token.rb')
  #   end
  # end
  # Rake::Task['secret:reset'].enhance ['secret:reset:custom']
  
  # If you're in to that:
  # task 'tmp:sessions:clear' => 'secret:reset'
  
  # Or in a capistrano deploy script. Etc.

end