Reduce cookie size

domain/src/main/kotlin/security/JwtPayload.kt

@@ -10,8 +10,8 @@ data class JwtPayload(val userId: Int, val username: String) {
 class JwtPayloadExtractor(private val jwt: SimpleJwt) {
     operator fun invoke(token: String): JwtPayload? = try {
         val decodedJWT = jwt.verifier.verify(token)
-        val id = decodedJWT.getClaim("id").asInt() ?: null
-        val username = decodedJWT.getClaim("username").asString() ?: null
+        val id = decodedJWT.getClaim(userIdField).asInt() ?: null
+        val username = decodedJWT.getClaim(usernameField).asString() ?: null
         id?.let { username?.let { JwtPayload(id, username) } }
     } catch (e: JWTVerificationException) {
         null

domain/src/main/kotlin/security/SimpleJwt.kt

@@ -7,14 +7,17 @@ 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("id", jwtPayload.userId)
-        .withClaim("username", jwtPayload.username)
+        .withClaim(userIdField, jwtPayload.userId)
+        .withClaim(usernameField, jwtPayload.username)
         .withExpiresAt(getExpiration())
         .sign(algorithm)
 

domain/src/test/kotlin/security/JwtPayloadExtractorTest.kt

@@ -21,8 +21,8 @@ internal class JwtPayloadExtractorTest {
     private fun createToken(username: String? = null, id: Int? = null, secret: String = jwtConfig.secret): Token {
         val algo = Algorithm.HMAC256(secret)
         return JWT.create().apply {
-            username?.let { withClaim("username", it) }
-            id?.let { withClaim("id", it) }
+            username?.let { withClaim(usernameField, it) }
+            id?.let { withClaim(userIdField, it) }
         }.sign(algo)
     }