VerificationService.scala

class SHA1VerificationService {

  private val secret = "<your key>"

  private def computeSHA1Hash(payloadBytes: Array[Byte], secret: String): String = {
    val HMAC_SHA1_ALGORITHM = "HmacSHA1"

    val secretKeySpec = new SecretKeySpec(secret.getBytes(StandardCharsets.UTF_8), HMAC_SHA1_ALGORITHM)
    val mac = Mac.getInstance(HMAC_SHA1_ALGORITHM)
    mac.init(secretKeySpec)
    val result: Array[Byte] = mac.doFinal(payloadBytes)
    val computedHash = Hex.encodeHexString(result)
    computedHash

  }

  def verifyPayload(payloadBytes: Array[Byte], expected: String): Boolean = {
    val computedHash = computeSHA1Hash(payloadBytes, secret)
    Logger.debug(s"Computed hash: $computedHash")
    val matched = computedHash == expected
    if (!matched)
      Logger.warn(s"Payload could not be verified. Computed: $computedHash and expected: $expected")
    matched
  }

}