Created
August 18, 2016 22:01
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S3 Signature Request Process v4, in ruby/rails
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# Algorithm: http://docs.aws.amazon.com/AmazonS3/latest/API/sigv4-authentication-HTTPPOST.html | |
# policy_params are the input policy as a rails request param object, which expects :conditions & :expiration | |
class S3Signer | |
def self.get_signature_key(key, date_stamp, region_name, service_name) | |
k_date = OpenSSL::HMAC.digest('sha256', "AWS4" + key, date_stamp) | |
k_region = OpenSSL::HMAC.digest('sha256', k_date, region_name) | |
k_service = OpenSSL::HMAC.digest('sha256', k_region, service_name) | |
k_signing = OpenSSL::HMAC.digest('sha256', k_service, "aws4_request") | |
k_signing | |
end | |
def self.sign_policy(policy_params, host) | |
conditions = policy_params[:conditions] | |
condz = {} | |
conditions.each do |c| | |
if c.respond_to? 'keys' | |
condz[c.keys[0]] = c[c.keys[0]] | |
end | |
end | |
policy = Base64.encode64(policy_params.to_json.encode('UTF-8')).gsub("\n","") | |
amzdate = condz['x-amz-date'] | |
secret_key = ENV['AWS_SECRET_ACCESS_KEY'] | |
datestamp = amzdate.split('T')[0] | |
region = 'us-west-2' | |
service = 's3' | |
signing_key = get_signature_key(secret_key, datestamp, region, service) | |
signature = OpenSSL::HMAC.hexdigest('sha256', signing_key, policy) | |
return { policy: policy, signature: signature } | |
end | |
end |
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