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package triad
import java.security.MessageDigest
import java.time.Instant
case class Message(content: String,
author: String,
timestamp: Instant = Instant.now()) {
lazy val id: String = {
val digest = MessageDigest.getInstance("SHA-256")
digest.update(content.getBytes)
digest.update(author.getBytes)
digest.update((timestamp.getEpochSecond & 0xff).toByte)
digest.update(((timestamp.getEpochSecond >> 8) & 0xff).toByte)
digest.update(((timestamp.getEpochSecond >> 16) & 0xff).toByte)
digest.update(((timestamp.getEpochSecond >> 24) & 0xff).toByte)
digest.update(((timestamp.getEpochSecond >> 32) & 0xff).toByte)
digest.update(((timestamp.getEpochSecond >> 40) & 0xff).toByte)
digest.update(((timestamp.getEpochSecond >> 48) & 0xff).toByte)
digest.update(((timestamp.getEpochSecond >> 56) & 0xff).toByte)
Message.bytesToHex(digest.digest())
}
def hashTags: Seq[String] =
content.split("\\s").filter(_.startsWith("#")).map(_.drop(1))
}
object Message {
private def bytesToHex(hash: Array[Byte]): String = {
val hexString = new StringBuffer(hash.length * 2)
var i = 0
while (i < hash.length) {
val hex = Integer.toHexString(0xff & hash(i))
if (hex.length == 1) hexString.append('0')
hexString.append(hex)
i += 1
}
hexString.toString
}
}
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