A Shell Script for listing the Domain names of your CloudFront Distributions and their Origins

list-cloudfront-distributions.rb

#!/usr/bin/env ruby

require 'json'

#######
#
# Classes to help execution
#
#######

class CloudfrontDomainList
  attr_reader :distributions
  
  def initialize(raw_json_string)
    json = JSON.parse(raw_json_string)
    @distributions = json.dig('DistributionList', 'Items')
  end
  
  def domain_listing
    distributions.map do |distribution_json|
      CloudfrontDomain.new(distribution_json).log_to_console
    end
  end
end

class CloudfrontDomain
  attr_reader :distribution_json
  
  def initialize(distribution_json)
    @distribution_json = distribution_json
  end
  
  def log_to_console
    $stdout.puts "Domain Name: #{domain_name}\t------\tOrigins: #{origins_string}"
  end
  
  private
  
  def domain_name
    distribution_json['DomainName']
  end
  
  def origins_string
    origins = distribution_json.dig('Origins', 'Items')
    origins.map { |origin| origin['DomainName'] }.join("\t")
  end
end

#######
#
# Line of execution
#
#######

CloudfrontDomainList.new(`aws cloudfront list-distributions`).domain_listing

NOTE: This shell script rests on several assumptions:

1. You have ruby 2.0+ installed on your system
2. You have an AWS account
3. You have installed the AWS CLI
4. Your default AWS CLI profile has permission to view CloudFront distributions

Before you run this for the first time:
Run aws configure set preview.cloudfront true as (at time of writing) the list-distributions command is still in preview mode.

If you'd like to use a different aws cli profile:
Simply switch the command on line 55 from

CloudfrontDomainList.new(`aws cloudfront list-distributions`).domain_listing

to

CloudfrontDomainList.new(`aws cloudfront list-distributions --profile your_preferred_profile`).domain_listing

where your_preferred_profile is the name of the profile you'd like to use

I started pretty simple, but you could also add, at the very least, the status of each distribution to the printout.