demarches-normaliennes/lib/cellar/amazon_v2_request_signer.rb
2018-10-26 10:10:20 +00:00

43 lines
1.4 KiB
Ruby

require 'base64'
require 'openssl'
module Cellar
class AmazonV2RequestSigner
def initialize(access_key_id, secret_access_key, bucket)
@access_key_id = access_key_id
@secret_access_key = secret_access_key
@bucket = bucket
end
def sign(request, key)
date = Time.zone.now.httpdate
sig = signature(
method: request.method,
key: key,
date: date,
checksum: request['Content-MD5'] || '',
content_type: request.content_type || ''
)
request['date'] = date
request['authorization'] = "AWS #{@access_key_id}:#{sig}"
end
def url_signature_params(method:, key:, expires_in:, content_type: '', checksum: '')
expires = expires_in.from_now.to_i
{
AWSAccessKeyId: @access_key_id,
Expires: expires,
Signature: signature(method: method, key: key, expires: expires, content_type: content_type, checksum: checksum)
}
end
def signature(method:, key:, expires: '', date: '', content_type: '', checksum: '')
canonicalized_amz_headers = ""
canonicalized_resource = "/#{@bucket}/#{key}"
string_to_sign = "#{method}\n#{checksum}\n#{content_type}\n#{expires}#{date}\n" +
"#{canonicalized_amz_headers}#{canonicalized_resource}"
Base64.encode64(OpenSSL::HMAC.digest(OpenSSL::Digest.new('sha1'), @secret_access_key, string_to_sign)).strip
end
end
end