Carrierwave and fog config.

s3_credentials.rb

require 'colorize'

module Amazon
  
  S3_BUCKET_NAME        = ENV['S3_BUCKET_NAME']
  AWS_ACCESS_KEY        = ENV['AWS_ACCESS_KEY']
  AWS_SECRET_ACCESS_KEY = ENV['AWS_SECRET_ACCESS_KEY']
  
  def self.all_keys_initialized?
    S3_BUCKET_NAME && AWS_SECRET_ACCESS_KEY && AWS_ACCESS_KEY
  end

  def self.uninitialized_keys_warning_msg
    puts "WARNING: AWS Environmental Variables not initialized. See config/initializers/s3_credentials.".red
  end
end

if Amazon.all_keys_initialized?
  CarrierWave.configure do |config|
    config.fog_credentials = {
      provider: "AWS",
      aws_access_key_id: Amazon::AWS_ACCESS_KEY,
      aws_secret_access_key: Amazon::AWS_SECRET_ACCESS_KEY
    }
    config.fog_directory = Amazon::S3_BUCKET_NAME
  end
else
  Amazon.uninitialized_keys_warning_msg
end