fn to_staged_file_entry()

in services/execution/enclave/src/task_file_manager.rs [118:164]

• 47 lines of code
• 1 McCabe index (conditional complexity)

    fn to_staged_file_entry(&self) -> Result<(String, StagedFileInfo)> {
        let src = &self.download_path;
        let dst = &self.staged_path;
        let staged_file_info = match self.file.crypto_info {
            FileCrypto::TeaclaveFile128(crypto) => {
                std::os::unix::fs::symlink(src, dst)?;
                StagedFileInfo::new(src, crypto, self.file.cmac)
            }
            FileCrypto::AesGcm128(crypto) => {
                let mut bytes = read_all_bytes(src)?;
                let n = bytes.len();
                anyhow::ensure!(
                    n > FILE_AUTH_TAG_LENGTH,
                    "AesGcm128 File, invalid length: {:?}",
                    src
                );
                anyhow::ensure!(
                    self.file.cmac == bytes[n - FILE_AUTH_TAG_LENGTH..],
                    "AesGcm128 File, invalid tag: {:?}",
                    src
                );
                crypto.decrypt(&mut bytes)?;
                StagedFileInfo::create_with_bytes(dst, &bytes)?
            }
            FileCrypto::AesGcm256(crypto) => {
                let mut bytes = read_all_bytes(src)?;
                let n = bytes.len();
                anyhow::ensure!(
                    n > FILE_AUTH_TAG_LENGTH,
                    "AesGcm256 File, invalid length: {:?}",
                    src
                );
                anyhow::ensure!(
                    self.file.cmac == bytes[n - FILE_AUTH_TAG_LENGTH..],
                    "AesGcm256 File, invalid tag: {:?}",
                    src
                );
                crypto.decrypt(&mut bytes)?;
                StagedFileInfo::create_with_bytes(dst, &bytes)?
            }
            FileCrypto::Raw => {
                let bytes = read_all_bytes(src)?;
                StagedFileInfo::create_with_bytes(dst, &bytes)?
            }
        };
        Ok((self.funiq_key.clone(), staged_file_info))
    }