Move packages + remove circular dependencies

simplenotes-domain/src/main/kotlin/be/simplenotes/domain/security/SimpleJwt.kt

@@ -0,0 +1,25 @@
+package be.simplenotes.domain.security
+
+import be.simplenotes.config.JwtConfig
+import com.auth0.jwt.JWT
+import com.auth0.jwt.JWTVerifier
+import com.auth0.jwt.algorithms.Algorithm
+import java.util.*
+import java.util.concurrent.TimeUnit
+
+internal const val userIdField = "i"
+internal const val usernameField = "u"
+
+class SimpleJwt(jwtConfig: JwtConfig) {
+    private val validityInMs = TimeUnit.MILLISECONDS.convert(jwtConfig.validity, jwtConfig.timeUnit)
+    private val algorithm = Algorithm.HMAC256(jwtConfig.secret)
+
+    val verifier: JWTVerifier = JWT.require(algorithm).build()
+    fun sign(jwtPayload: JwtPayload): String = JWT.create()
+        .withClaim(userIdField, jwtPayload.userId)
+        .withClaim(usernameField, jwtPayload.username)
+        .withExpiresAt(getExpiration())
+        .sign(algorithm)
+
+    private fun getExpiration() = Date(System.currentTimeMillis() + validityInMs)
+}