WpWwcUsD

1@ExperimentalStdlibApi
2class CoinbaseAuthHelper(private val logger: Logger,
3                         private val token: Token,
4                         clock: Clock,
5                         private val httpMethod: String,
6                         private val path: String,
7                         private val body: String) {
8
9    val coinbaseSignature: String = "CB-ACCESS-SIGN"
10    val coinbaseKey: String = "CB-ACCESS-KEY"
11    val coinbaseTimestamp: String = "CB-ACCESS-TIMESTAMP"
12    val coinbasePassphrase: String = "CB-ACCESS-PASSPHRASE"
13    private val algorithm = "HmacSHA256"
14    private val sha256: Mac = Mac.getInstance(algorithm)
15
16    val timestamp = clock.instant().toEpochMilli().toString()
17    private val preHash: String
18
19    init {
20        preHash = configurePreHashMessage()
21    }
22
23    private fun configurePreHashMessage(): String = timestamp + httpMethod + path + body
24
25    fun getSignature(): String {
26        val secretKey = SecretKeySpec(Base64.getDecoder().decode(token.apiSecret), algorithm)
27        sha256.init(secretKey)
28
29        return Base64.getEncoder().encodeToString(sha256.doFinal(preHash.toByteArray()))
30    }
31}