Created
April 11, 2019 08:24
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HmacGenerator for Coupang partners with Kotlin
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import org.apache.commons.codec.binary.Hex | |
import java.nio.charset.Charset | |
import java.security.GeneralSecurityException | |
import java.text.SimpleDateFormat | |
import java.util.* | |
import javax.crypto.Mac | |
import javax.crypto.spec.SecretKeySpec | |
object HmacGenerator { | |
private const val EXCEPTION_MESSAGE = "incorrect uri format" | |
private const val SPLIT_TEXT = "\\?" | |
private const val EMPTY_TEXT = "" | |
private const val DATE_FORMAT = "yyMMdd'T'HHmmss'Z'" | |
private const val ALGORITHM = "HmacSHA256" | |
private const val ALGORITHM_FORMAT = "CEA algorithm=%s, access-key=%s, signed-date=%s, signature=%s" | |
private val STANDARD_CHARSET = Charset.forName("UTF-8") | |
fun generate(method: String, uri: String, secretKey: String, accessKey: String): String { | |
val parts = uri.split(SPLIT_TEXT) | |
if (parts.size > 2) { | |
throw RuntimeException(EXCEPTION_MESSAGE) | |
} | |
val path = parts[0] | |
val query = if (parts.size == 2) parts[1] else EMPTY_TEXT | |
val dateFormatGmt = SimpleDateFormat(DATE_FORMAT).also { it.timeZone = TimeZone.getTimeZone("GMT") } | |
val datetime = dateFormatGmt.format(Date()) | |
val message = datetime + method + path + query | |
val signature: String = try { | |
val signingKey = SecretKeySpec(secretKey.toByteArray(STANDARD_CHARSET), ALGORITHM) | |
val mac = Mac.getInstance(ALGORITHM).apply { init(signingKey) } | |
val rawHmac = mac.doFinal(message.toByteArray(STANDARD_CHARSET)) | |
Hex.encodeHexString(rawHmac) | |
} catch (e: GeneralSecurityException) { | |
throw IllegalArgumentException() | |
} | |
return String.format(ALGORITHM_FORMAT, ALGORITHM, accessKey, datetime, signature) | |
} | |
} |
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