# File lib/aws/s3/presigned_post.rb, line 342 def fields secret = config.credential_provider.secret_access_key signature = Core::Signers::Base.sign(secret, policy, 'sha1') fields = { "AWSAccessKeyId" => config.credential_provider.access_key_id, "key" => key, "policy" => policy, "signature" => signature }.merge(optional_fields) if token = config.credential_provider.session_token fields["x-amz-security-token"] = token end fields.merge(optional_fields) end