Class: AWSRaw::S3::QueryStringSigner

Inherits:
Signer
  • Object
show all
Defined in:
lib/awsraw/s3/query_string_signer.rb

Overview

Generates a signed query string to make an authenticated S3 GET request

See docs.amazonwebservices.com/AmazonS3/latest/dev/RESTAuthentication.html#RESTAuthenticationQueryStringAuth

The Authorization header method is usually preferable, as implemented in AWSRaw::S3::Signer. However, you may have occasions where you need a simple “download URL”, without having to tell your user-agent (browser, curl, wget, etc) about all the special AWS headers. The query string authentication method is useful in those cases.

Constant Summary

Constants inherited from Signer

Signer::SUBRESOURCES

Instance Method Summary collapse

Methods inherited from Signer

#authorization_header_value, #encoded_signature, #initialize

Constructor Details

This class inherits a constructor from AWSRaw::S3::Signer

Instance Method Details

#query_string_hash(url, expires, headers = {}) ⇒ Object 



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# File 'lib/awsraw/s3/query_string_signer.rb', line 25

def query_string_hash(url, expires, headers = {})
  string_to_sign = string_to_sign(url, expires, headers)
  signature = encoded_signature(string_to_sign)

  {
    "AWSAccessKeyId" => @access_key_id,
    "Expires"        => expires.to_s,
    "Signature"      => CGI.escape(signature)
  }
end

#sign_with_query_string(url, expires, headers = {}) ⇒ Object 



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# File 'lib/awsraw/s3/query_string_signer.rb', line 17

def sign_with_query_string(url, expires, headers = {})
  query_string_hash = query_string_hash(url, expires, headers)

  uri = URI.parse(url)
  uri.query = query_string_hash.map { |k,v| "#{k}=#{v}" }.join("&")
  uri.to_s
end

#string_to_sign(url, expires, headers) ⇒ Object 



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# File 'lib/awsraw/s3/query_string_signer.rb', line 36

def string_to_sign(url, expires, headers)
  [
    "GET",
    headers["Content-MD5"],
    headers["Content-Type"],
    expires.to_s,
    canonicalized_amz_headers(headers),
    canonicalized_resource(URI.parse(url))
  ].flatten.join("\n")
end