#12 Add custom claims to JWT builder

src/main/kotlin/dev/fyloz/colorrecipesexplorer/utils/Jwt.kt

@@ -12,11 +12,14 @@ data class Jwt(
     val subject: String,
     val secret: String,
     val duration: Long? = null,
-    val signatureAlgorithm: SignatureAlgorithm = SignatureAlgorithm.HS512
+    val signatureAlgorithm: SignatureAlgorithm = SignatureAlgorithm.HS512,
+    val claims: Map<String, Any?> = mapOf()
 ) {
     val token: String by lazy {
         val builder = Jwts.builder()
+            .signWith(keyFromSecret(secret))
             .setSubject(subject)
+            .addClaims(claims.filterValues { it != null })
 
         duration?.let {
             val expirationMs = System.currentTimeMillis() + it
@@ -25,15 +28,21 @@ data class Jwt(
             builder.setExpiration(expirationDate)
         }
 
-        builder
-            .signWith(keyFromSecret(secret))
-            .compact()
+        builder.compact()
     }
 }
 
 /** Build a [Jwt] for the given [User]. */
 fun User.buildJwt(secret: String, duration: Long?) =
-    Jwt(this.id.toString(), secret, duration)
+    Jwt(
+        subject = this.id.toString(),
+        secret,
+        duration,
+        claims = mapOf(
+            "groupId" to this.group?.id,
+            "groupName" to this.group?.name
+        )
+    )
 
 /** Parses the given [jwt] string. */
 fun parseJwt(jwt: String, secret: String) =