heroku_config.rake

README.md

ローカルのomniauth.ymlにheroku用の設定を書いておいて、

$ rake heroku_config:upload

すればherokuに設定がコピーされます。

heroku_config.rake

namespace :heroku_config do
  desc "upload heroku settings"
  task :upload => :environment do
    %w(omniauth s3 authorized_ids).each do |config_name|
      c = File.open("config/#{config_name}.yml", &:read)
      `heroku config:add #{config_name.upcase}="#{c}"`
    end
  end
end

omniauth.rb

Rails.application.config.middleware.use OmniAuth::Builder do
  config = if Rails.env.production?
             YAML.load(ENV['OMNIAUTH'])
           else
             YAML.load_file(Rails.root.join('config/omniauth.yml'))
           end
  key, secret = config[Rails.env].values_at 'facebook_key', 'facebook_secret'
  provider :facebook, key, secret, :scope => :email
end