Module: AWS::SigV4

Defined in:
lib/aws/sig_v4.rb

Class Method Summary collapse

Class Method Details

.canonical_request(host, payload, time_stamp) ⇒ Object 



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# File 'lib/aws/sig_v4.rb', line 8

def self.canonical_request(host, payload, time_stamp)
  headers = {
    'Content-Encoding' => 'amz-1.0',
    'Host' => host,
    'X-Amz-Content-Sha256' => OpenSSL::Digest::SHA256.hexdigest(payload),
    'X-Amz-Date' => time_stamp,
    'X-Amz-Target' => "com.amazon.paapi5.v1.ProductAdvertisingAPIv1.GetItems",
  }
  [
    "POST",
    "/paapi5/getitems",
    '',
    headers.keys.sort.map{|k|"#{k.downcase}:#{headers[k]}"}.join("\n") + "\n",
    headers.keys.sort.map{|k|k.downcase}.join(';'),
    OpenSSL::Digest::SHA256.hexdigest(payload)
  ].join("\n")
end

.hmac(key, value) ⇒ Object 



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# File 'lib/aws/sig_v4.rb', line 41

def self.hmac(key, value)
  OpenSSL::HMAC.digest(OpenSSL::Digest.new('sha256'), key, value)
end

.signature(secret, time_stamp, region, host, payload) ⇒ Object 



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# File 'lib/aws/sig_v4.rb', line 33

def self.signature(secret, time_stamp, region, host, payload)
  k_secret = secret
  k_date = hmac("AWS4" + k_secret, time_stamp[0,8])
  k_region = hmac(k_date, region)
  k_service = hmac(k_region, 'ProductAdvertisingAPI')
  k_credential = hmac(k_service, "aws4_request")
  OpenSSL::HMAC.hexdigest(OpenSSL::Digest.new('sha256'), k_credential, string2sign(host, payload, time_stamp))
end

.string2sign(host, payload, time_stamp) ⇒ Object 



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# File 'lib/aws/sig_v4.rb', line 25

def self.string2sign(host, payload, time_stamp)
  [
    'AWS4-HMAC-SHA256',
    time_stamp,
    "#{time_stamp[0,8]}/us-west-2/ProductAdvertisingAPI/aws4_request",
    OpenSSL::Digest::SHA256.hexdigest(canonical_request(host, payload, time_stamp))
  ].join("\n")
end