Merge pull request 'caps the number of allowed dice' (#39) from limit-number-of-diece into main

Reviewed-on: #39

README.md

@@ -42,6 +42,8 @@ services:
     restart: always
     ports:
       - "8080:8080"
+    environment:
+      DICE_LIMIT: 30    # OPTIONAL: amount of dice allowed to roll (default: 30)
 ```
 Run the container with:
 ```bash

src/main/kotlin/de/arindy/dicetower/DiceResource.kt

@@ -14,12 +14,19 @@ import jakarta.ws.rs.sse.OutboundSseEvent
 import jakarta.ws.rs.sse.Sse
 import jakarta.ws.rs.sse.SseBroadcaster
 import jakarta.ws.rs.sse.SseEventSink
+import org.eclipse.microprofile.config.inject.ConfigProperty
+import java.util.Optional
 import java.util.UUID
 
+private const val LIMIT = 30
+
 @Path("/dice/{id}")
 @ApplicationScoped
 final class DiceResource(@Context val sse: Sse) {
 
+    @ConfigProperty(name = "dice.limit")
+    private lateinit var diceLimit: Optional<Int>
+
     private var eventBuilder: OutboundSseEvent.Builder = sse.newEventBuilder()
     private var sseBroadcasters: MutableMap<String, SseBroadcaster> = HashMap()
 
@@ -30,15 +37,24 @@ final class DiceResource(@Context val sse: Sse) {
         data.user = id.split(":")[1]
 
         val results = ArrayList<Results>()
+        var numberOfDice = 0
         data.command.split(" ", "&", "and").filter { it.isNotEmpty() }.map { it.trim() }.toTypedArray<String>().forEach { command ->
             val dice = command.split("d")
-            val result = IntArray(dice[0].toInt())
-            val sides = dice[1].split("+", "-")
-            val modifier = if (dice[1].contains("+")) sides[1].toInt() else if (dice[1].contains("+")) -1 * sides[1].toInt() else 0
-            repeat(dice[0].toInt()) { index ->
-                result[index] = (Math.random() * sides[0].toInt() + 1).toInt()
+            var amount = dice[0].toInt()
+            val limit = diceLimit.orElse(LIMIT)
+            if (limit < numberOfDice + amount) {
+                amount = limit - numberOfDice
+            }
+            numberOfDice += amount
+            if (amount > 0) {
+                val result = IntArray(amount)
+                val sides = dice[1].split("+", "-")
+                val modifier = if (dice[1].contains("+")) sides[1].toInt() else if (dice[1].contains("+")) -1 * sides[1].toInt() else 0
+                repeat(amount) { index ->
+                    result[index] = (Math.random() * sides[0].toInt() + 1).toInt()
+                }
+                results.add(Results(sides[0].toInt(), modifier, result.sum() + modifier, result.map { Roll(it) }.toTypedArray()))
             }
-            results.add(Results(sides[0].toInt(), modifier, result.sum() + modifier, result.map { Roll(it) }.toTypedArray()))
         }
         val map = results.map { r ->
             "${r.rolls.size}d${r.sides}@${