Module: VagrantPlugins::S3Auth::Util

Defined in:
lib/vagrant-s3auth-mfa/util.rb

Defined Under Namespace

Classes: NullObject

Constant Summary collapse

S3_HOST_MATCHER = 
/^((?<bucket>[[:alnum:]\-\.]+).)?s3([[:alnum:]\-\.]+)?\.amazonaws\.com$/
AWS_ACCESS_KEY_ENV_VARS =

The list of environment variables that the AWS Ruby SDK searches for access keys. Sadly, there’s no better way to determine which environment variable the Ruby SDK is using without mirroring the logic ourself.

See: github.com/aws/aws-sdk-ruby/blob/ab0eb18d0ce0a515254e207dae772864c34b048d/aws-sdk-core/lib/aws-sdk-core/credential_provider_chain.rb#L42

%w[AWS_ACCESS_KEY_ID AMAZON_ACCESS_KEY_ID AWS_ACCESS_KEY].freeze
DEFAULT_REGION = 
'us-east-1'.freeze
LOCATION_TO_REGION = 
Hash.new { |_, key| key }.merge(
  '' => DEFAULT_REGION,
  'EU' => 'eu-west-1'
)

Class Method Summary collapse

Class Method Details

.get_bucket_region(bucket) ⇒ Object 



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# File 'lib/vagrant-s3auth-mfa/util.rb', line 72

def self.get_bucket_region(bucket)
  LOCATION_TO_REGION[
    s3_client.get_bucket_location(bucket: bucket).location_constraint
  ]
rescue ::Aws::S3::Errors::AccessDenied
  raise Errors::BucketLocationAccessDeniedError, bucket: bucket
end

.s3_client(region = DEFAULT_REGION) ⇒ Object 



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# File 'lib/vagrant-s3auth-mfa/util.rb', line 33

def self.s3_client(region = DEFAULT_REGION)
  unless ENV['AWS_CONFIG_PROFILE'].nil?
    config = AWSConfig[ENV['AWS_CONFIG_PROFILE']]
    set_credentials_from_profile(config) if ::Aws.config.empty?
  end
  ::Aws::S3::Client.new(region: region)
end

.s3_credential_provider ⇒ Object 



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# File 'lib/vagrant-s3auth-mfa/util.rb', line 80

def self.s3_credential_provider
  # Providing a NullObject here is the same as instantiating a
  # client without specifying a credentials config, like we do in
  # `self.s3_client`.
    unless ENV['AWS_CONFIG_PROFILE'].nil?
      ENV['AWS_CONFIG_PROFILE']
    else
      ::Aws::CredentialProviderChain.new(NullObject.new).resolve
    end
end

.s3_object_for(url, follow_redirect = true) ⇒ Object 



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# File 'lib/vagrant-s3auth-mfa/util.rb', line 45

def self.s3_object_for(url, follow_redirect = true)
  url = URI(url)

  if url.scheme == 's3'
    bucket = url.host
    key = url.path[1..-1]
    raise Errors::MalformedShorthandURLError, url: url unless bucket && key
  elsif match = S3_HOST_MATCHER.match(url.host)
    components = url.path.split('/').delete_if(&:empty?)
    bucket = match['bucket'] || components.shift
    key = components.join('/')
  end

  if bucket && key
    s3_resource(get_bucket_region(bucket)).bucket(bucket).object(key)
  elsif follow_redirect
    response = Net::HTTP.get_response(url) rescue nil
    if response.is_a?(Net::HTTPRedirection)
      s3_object_for(response['location'], false)
    end
  end
end

.s3_resource(region = DEFAULT_REGION) ⇒ Object 



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# File 'lib/vagrant-s3auth-mfa/util.rb', line 41

def self.s3_resource(region = DEFAULT_REGION)
  ::Aws::S3::Resource.new(client: s3_client(region))
end

.s3_url_for(method, s3_object) ⇒ Object 



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# File 'lib/vagrant-s3auth-mfa/util.rb', line 68

def self.s3_url_for(method, s3_object)
  s3_object.presigned_url(method, expires_in: 60 * 10)
end

.set_credentials_from_profile(region = DEFAULT_REGION, config) ⇒ Object 



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# File 'lib/vagrant-s3auth-mfa/util.rb', line 91

def self.set_credentials_from_profile(region = DEFAULT_REGION, config)
  creds = ::Aws::Credentials.new(
    config.aws_access_key_id,
    config.aws_secret_access_key
  )
  sts_client = ::Aws::STS::Client.new(
    credentials: creds 
  )
  if config.respond_to?(:mfa_serial)
    print 'Enter AWS MFA token: '
    token_code = STDIN.noecho(&:gets).chomp
    creds = sts_client.get_session_token(
      duration_seconds: 900,
      serial_number: config.mfa_serial,
      token_code: token_code
    )
    sts_client = ::Aws::STS::Client.new(
      access_key_id: creds.credentials.access_key_id,
      secret_access_key: creds.credentials.secret_access_key,
      session_token: creds.credentials.session_token
    )
  end
  if config.respond_to?(:role_arn)
  creds = ::Aws::AssumeRoleCredentials.new(
    client: sts_client,
    role_arn: config.role_arn,
    role_session_name: "#{ENV['USER']}-#{Time.now.utc.iso8601.tr!('-:', '_')}"
  )
  end
  ::Aws.config.update(
    region: config.region,
    credentials: creds
  )
rescue StandardError => e
    raise Errors::SetCredentialsFromProfileError, profile: config.name, error: e
end