Converts service account credentials to YML for adding to Rails encrypted credentials in an easier way.

convert_google_service_account_credentials_to_yml.rb

require "json"
require "yaml"

# Read the JSON key file
credentials_path = "path/to/file.json"
json_key = JSON.parse(File.read(credentials_path)

# Structure the data for Rails credentials
credentials = {
  "gcs" => {
    "bucket_name" => {
      "type" => json_key["type"],
      "project_id" => json_key["project_id"],
      "private_key_id" => json_key["private_key_id"],
      "private_key" => json_key["private_key"],
      "client_email" => json_key["client_email"],
      "client_id" => json_key["client_id"],
      "auth_uri" => json_key["auth_uri"],
      "token_uri" => json_key["token_uri"],
      "auth_provider_x509_cert_url" => json_key["auth_provider_x509_cert_url"],
      "client_x509_cert_url" => json_key["client_x509_cert_url"]
    }
  }
}

# Convert to YAML with proper formatting
yaml_output = credentials.to_yaml

# Update the yaml to format private_key with literal block scalar (|)
yaml_output.gsub!(/private_key: "(.+?)"/m, 'private_key: |\n\1')

# Remove quotes around the private key content
yaml_output.gsub!(/^(\s+)(-----[^\n]+)$/m, '\1\2')

puts yaml_output