# Install the gem first: gem install aws-sdk-sns
require 'aws-sdk-sns'

Aws.config.update({
  region: 'eu-west-1',
  credentials: Aws::Credentials.new('aws_access_key_id', 'aws_secret_access_key')
})

def list_topics
  sns.topics.each do |topic|
    puts topic.arn
  end
end

def create_topic(name:)
  sns.create_topic(name: name)
end

def list_topic_subscriptions(topic)
  topic.subscriptions.each do |s|
    puts s.attributes['Endpoint']
  end
end

def sns
 @sns ||= Aws::SNS::Resource.new
end

topic = create_topic(name: 'my-first-topic')
# topic = sns.topic('arn:aws:sns:eu-west-1:account-id:topicname')

topic.subscribe({
    protocol: 'email',
    endpoint: 'foo@mailinator.com'
  })

list_topics

list_topic_subscriptions(topic)

topic.publish({
  message: 'Hello! Check your emails.'
})