fn as_sign()

in tough-kms/src/lib.rs [77:129]
52 lines of code
1 McCabe index (conditional complexity)

    fn as_sign(
        &self,
    ) -> std::result::Result<Box<dyn Sign>, Box<dyn std::error::Error + Send + Sync + 'static>>
    {
        let kms_client = match self.client.clone() {
            Some(value) => value,
            None => client::build_client_kms(self.profile.as_deref())?,
        };
        // Get the public key from AWS KMS
        let fut = kms_client.get_public_key(rusoto_kms::GetPublicKeyRequest {
            key_id: self.key_id.clone(),
            ..rusoto_kms::GetPublicKeyRequest::default()
        });
        let response = tokio::runtime::Runtime::new()
            .context(error::RuntimeCreationSnafu)?
            .block_on(fut)
            .context(error::KmsGetPublicKeySnafu {
                profile: self.profile.clone(),
                key_id: self.key_id.clone(),
            })?;
        let key = pem::encode_config(
            &pem::Pem {
                tag: String::from("PUBLIC KEY"),
                contents: response
                    .public_key
                    .context(error::PublicKeyNoneSnafu)?
                    .to_vec(),
            },
            pem::EncodeConfig {
                line_ending: pem::LineEnding::LF,
            },
        );
        ensure!(
            response
                .signing_algorithms
                .context(error::MissingSignAlgorithmSnafu)?
                .contains(&self.signing_algorithm.value()),
            error::ValidSignAlgorithmSnafu
        );
        Ok(Box::new(KmsRsaKey {
            profile: self.profile.clone(),
            client: Some(kms_client.clone()),
            key_id: self.key_id.clone(),
            public_key: key.parse().context(error::PublicKeyParseSnafu)?,
            signing_algorithm: self.signing_algorithm,
            modulus_size_bytes: parse_modulus_length_bytes(
                response
                    .customer_master_key_spec
                    .as_ref()
                    .context(error::MissingCustomerMasterKeySpecSnafu)?,
            )?,
        }))
    }