feat!: implemented multigame support (#34)

Reviewed-on: #34
Co-authored-by: Janis <janis.e.20@gmx.de>
Co-committed-by: Janis <janis.e.20@gmx.de>

knockoutwhistweb/app/util/GameUtil.scala

@@ -0,0 +1,29 @@
+package util
+
+import scala.util.Random
+
+object GameUtil {
+
+  private val CharPool: String = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"
+  private val CodeLength: Int = 6
+  private val MaxRepetition: Int = 2
+  private val random = new Random()
+
+  def generateCode(): String = {
+    val freq = Array.fill(CharPool.length)(0)
+    val code = new StringBuilder(CodeLength)
+
+    for (_ <- 0 until CodeLength) {
+      var index = random.nextInt(CharPool.length)
+      // Pick a new character if it's already used twice
+      while (freq(index) >= MaxRepetition) {
+        index = random.nextInt(CharPool.length)
+      }
+      freq(index) += 1
+      code.append(CharPool.charAt(index))
+    }
+
+    code.toString()
+  }
+  
+}

knockoutwhistweb/app/util/UserHash.scala

@@ -0,0 +1,23 @@
+package util
+
+import de.mkammerer.argon2.Argon2Factory
+import de.mkammerer.argon2.Argon2Factory.Argon2Types
+import model.users.User
+
+object UserHash {
+  private val ITERATIONS: Int = 3
+  private val MEMORY: Int = 32_768
+  private val PARALLELISM: Int = 1
+  private val SALT_LENGTH: Int = 32
+  private val HASH_LENGTH: Int = 64
+  private val ARGON_2 = Argon2Factory.create(Argon2Types.ARGON2id, SALT_LENGTH, HASH_LENGTH)
+
+  def hashPW(password: String): String = {
+    ARGON_2.hash(ITERATIONS, MEMORY, PARALLELISM, password.toCharArray)
+  }
+
+  def verifyUser(password: String, user: User): Boolean = {
+    ARGON_2.verify(user.passwordHash, password.toCharArray)
+  }
+
+}

knockoutwhistweb/app/util/WebUIUtils.scala

@@ -29,6 +29,6 @@ object WebUIUtils {
       case Three => "3"
       case Two => "2"
     }
-    views.html.output.card.apply(f"images/cards/$cv$s.png")(card.toString)
+    views.html.render.card.apply(f"images/cards/$cv$s.png")(card.toString)
   }
 }