VerifyPayload.scala

val verificationService = new SHA1VerificationService()

  def withVerifiedPayload[A](action: Action[RawBuffer])= Action.async(parse.raw) { request =>
    val xHubSignatureOption = request.headers.get("X-Hub-Signature")

    Logger.debug("Attempting to verify payload signature.")

    val verified =
      for {
        signature <- xHubSignatureOption
        rawBody <- request.body.asBytes()
      } yield {
        val bodyBytes = rawBody.utf8String.getBytes
        val incomingHash = signature.split("=").last
        verificationService.verifyPayload(bodyBytes, incomingHash)
      }

    if(verified.getOrElse(false)) {
      Logger.debug("Succeeded in verifying payload!")
      action(request)
    }
    else {
      Logger.warn("Could not verify the payload signature!")
      Future { BadRequest("Bad signature!") }
    }
  }