Class: Gem::S3URISigner

Inherits:
Object show all
Defined in:
lib/rubygems/s3_uri_signer.rb

Overview

S3URISigner implements AWS SigV4 for S3 Source to avoid a dependency on the aws-sdk-* gems More on AWS SigV4: docs.aws.amazon.com/AmazonS3/latest/API/sig-v4-authenticating-requests.html

Defined Under Namespace

Classes: ConfigurationError, InstanceProfileError, S3Config

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(uri) ⇒ S3URISigner

Returns a new instance of S3URISigner.



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# File 'lib/rubygems/s3_uri_signer.rb', line 31

def initialize(uri)
  @uri = uri
end

Instance Attribute Details

#uri ⇒ Object

Returns the value of attribute uri.



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# File 'lib/rubygems/s3_uri_signer.rb', line 29

def uri
  @uri
end

Instance Method Details

#sign(expiration = 86400) ⇒ Object

Signs S3 URI using query-params according to the reference: docs.aws.amazon.com/AmazonS3/latest/API/sigv4-query-string-auth.html



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# File 'lib/rubygems/s3_uri_signer.rb', line 37

def sign(expiration = 86400)
  s3_config = fetch_s3_config

  current_time = Time.now.utc
  date_time = current_time.strftime("%Y%m%dT%H%m%SZ")
  date = date_time[0,8]

  credential_info = "#{date}/#{s3_config.region}/s3/aws4_request"
  canonical_host = "#{uri.host}.s3.#{s3_config.region}.amazonaws.com"

  query_params = generate_canonical_query_params(s3_config, date_time, credential_info, expiration)
  canonical_request = generate_canonical_request(canonical_host, query_params)
  string_to_sign = generate_string_to_sign(date_time, credential_info, canonical_request)
  signature = generate_signature(s3_config, date, string_to_sign)

  URI.parse("https://#{canonical_host}#{uri.path}?#{query_params}&X-Amz-Signature=#{signature}")
end