Export AWS SNS Topic Subscriptions

export_sns_topic_subscriptions.rb

@client = AWS::SNS::Client.new(
  region: 'AWS_SNS_REGION',
  access_key_id: 'AWS_SNS_KEY_ID',
  secret_access_key: 'AWS_SNS_ACCESS_KEY'
)

fetch_more = true
next_token = nil
subscriptions = []

while fetch_more
  attributes = { 
    topic_arn: 'TOPIC_ARN' 
  }
  attributes = attributes.merge(next_token: next_token) if next_token.present?
  response = @client.list_subscriptions_by_topic(attributes)

  response[:subscriptions].each do |subscription|
    subscriptions << subscription.to_h
  end
  
  if response[:next_token].present?
    next_token = response[:next_token]
  else
    fetch_more = false
  end
end

require 'json'
File.open("#{Rails.root.to_s}/public/subscriptions.json","w") do |f|
  f.write(endpoints.to_json)
end