Chat filter

Roseau-Server/src/main/java/org/alexdev/roseau/game/GameVariables.java

@@ -18,6 +18,8 @@ public class GameVariables {
 	public static String MESSENGER_GREETING;
 	public static boolean DEBUG_ENABLE = false;
 	public static int AFK_ROOM_KICK;
+	public static String CHAT_FILTER_WORDS;
+	public static String CHAT_FILTER_REPLACEMENT;
 
 
 	public static void setVariables() {
@@ -33,5 +35,8 @@ public static void setVariables() {
 		TALK_DISTANCE = Util.getHabboConfig().get("Player", "talking.lookat.distance", Integer.class);
 		USER_DEFAULT_CREDITS = Util.getHabboConfig().get("Register", "user.default.credits", int.class);
 		DEBUG_ENABLE = Util.getHabboConfig().get("Debug", "debug.enable", Boolean.class);
+		CHAT_FILTER_WORDS = Util.getHabboConfig().get("Chat", "filter.words", String.class);
+		CHAT_FILTER_REPLACEMENT = Util.getHabboConfig().get("Chat", "filter.replacement", String.class);
+
 	}
 }

Roseau-Server/src/main/java/org/alexdev/roseau/game/room/entity/ChatUtility.java

@@ -3,6 +3,7 @@
 import java.util.Hashtable;
 import java.util.Map;
 import java.util.Random;
+import org.alexdev.roseau.game.GameVariables;
 
 /*
  * Written by office.boy (Mike) and Nillus from Blunk v5
@@ -53,7 +54,27 @@ public static void setupEmotes(boolean classicOnly)
 
 	public static String[] filterWords(String[] words)
 	{
-		// TODO: crappy word filter for swearwords
+		String filterList = GameVariables.CHAT_FILTER_WORDS;
+		String replacement = GameVariables.CHAT_FILTER_REPLACEMENT;
+
+		if (filterList == null || filterList.isEmpty() || replacement == null || replacement.isEmpty()) {
+			return words;
+		}
+
+		String[] bannedWords = filterList.split(",");
+
+		for (int i = 0; i < words.length; i++) {
+			// try to prevent bypasses like f.uck
+			String normalized = words[i].replaceAll("[^a-zA-Z]", "");
+
+			for (String banned : bannedWords) {
+				if (normalized.equalsIgnoreCase(banned.trim())) {
+					words[i] = replacement;
+					break;
+				}
+			}
+		}
+
 		return words;
 	}
 

Roseau-Server/src/main/java/org/alexdev/roseau/game/room/entity/ChatUtilityTest.java

@@ -0,0 +1,162 @@
+package org.alexdev.roseau.game.room.entity;
+
+import org.alexdev.roseau.game.GameVariables;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class ChatUtilityTest {
+
+    @BeforeEach
+    void setUp() {
+        GameVariables.CHAT_FILTER_WORDS = "fuck,sex,damn";
+        GameVariables.CHAT_FILTER_REPLACEMENT = "bobba";
+    }
+
+    @Test
+    void noFilterConfigured_returnsWordsUnchanged() {
+        GameVariables.CHAT_FILTER_WORDS = null;
+
+        String[] input = {"hello", "world"};
+        String[] result = ChatUtility.filterWords(input);
+
+        assertArrayEquals(new String[]{"hello", "world"}, result);
+    }
+
+    @Test
+    void emptyFilterList_returnsWordsUnchanged() {
+        GameVariables.CHAT_FILTER_WORDS = "";
+
+        String[] input = {"hello", "world"};
+        String[] result = ChatUtility.filterWords(input);
+
+        assertArrayEquals(new String[]{"hello", "world"}, result);
+    }
+
+    @Test
+    void noReplacementConfigured_returnsWordsUnchanged() {
+        GameVariables.CHAT_FILTER_REPLACEMENT = null;
+
+        String[] input = {"fuck", "world"};
+        String[] result = ChatUtility.filterWords(input);
+
+        assertArrayEquals(new String[]{"fuck", "world"}, result);
+    }
+
+    @Test
+    void exactMatch_isReplaced() {
+        String[] input = {"fuck", "hello"};
+        String[] result = ChatUtility.filterWords(input);
+
+        assertArrayEquals(new String[]{"bobba", "hello"}, result);
+    }
+
+    @Test
+    void caseInsensitiveMatch_isReplaced() {
+        String[] input = {"FUCK", "Fuck"};
+        String[] result = ChatUtility.filterWords(input);
+
+        assertArrayEquals(new String[]{"bobba", "bobba"}, result);
+    }
+
+    @Test
+    void dots_areStrippedBeforeMatch() {
+        String[] input = {"f.uck"};
+        String[] result = ChatUtility.filterWords(input);
+
+        assertArrayEquals(new String[]{"bobba"}, result);
+    }
+
+    @Test
+    void dashes_areStrippedBeforeMatch() {
+        String[] input = {"f-u-c-k"};
+        String[] result = ChatUtility.filterWords(input);
+
+        assertArrayEquals(new String[]{"bobba"}, result);
+    }
+
+    @Test
+    void underscores_areStrippedBeforeMatch() {
+        String[] input = {"f_u_c_k"};
+        String[] result = ChatUtility.filterWords(input);
+
+        assertArrayEquals(new String[]{"bobba"}, result);
+    }
+
+    @Test
+    void numbers_areStrippedBeforeMatch() {
+        String[] input = {"f0uck"};
+        String[] result = ChatUtility.filterWords(input);
+
+        assertArrayEquals(new String[]{"bobba"}, result);
+    }
+
+    @Test
+    void mixedSeparators_areStrippedBeforeMatch() {
+        String[] input = {"f...u...c...k"};
+        String[] result = ChatUtility.filterWords(input);
+
+        assertArrayEquals(new String[]{"bobba"}, result);
+    }
+
+    @Test
+    void multipleSeparatorsTogether_areStrippedBeforeMatch() {
+        String[] input = {"f.u-c_k"};
+        String[] result = ChatUtility.filterWords(input);
+
+        assertArrayEquals(new String[]{"bobba"}, result);
+    }
+
+    @Test
+    void nonBannedWord_isUnchanged() {
+        String[] input = {"hello"};
+        String[] result = ChatUtility.filterWords(input);
+
+        assertArrayEquals(new String[]{"hello"}, result);
+    }
+
+    @Test
+    void multipleWords_someFiltered() {
+        String[] input = {"hello", "fuck", "world", "sex"};
+        String[] result = ChatUtility.filterWords(input);
+
+        assertArrayEquals(new String[]{"hello", "bobba", "world", "bobba"}, result);
+    }
+
+    @Test
+    void multipleBannedWords_allReplaced() {
+        GameVariables.CHAT_FILTER_WORDS = "fuck,sex,damn";
+
+        String[] input = {"fuck", "sex", "damn"};
+        String[] result = ChatUtility.filterWords(input);
+
+        assertArrayEquals(new String[]{"bobba", "bobba", "bobba"}, result);
+    }
+
+    @Test
+    void whitespaceInFilterList_isTrimmed() {
+        GameVariables.CHAT_FILTER_WORDS = " fuck , sex ";
+
+        String[] input = {"fuck", "sex"};
+        String[] result = ChatUtility.filterWords(input);
+
+        assertArrayEquals(new String[]{"bobba", "bobba"}, result);
+    }
+
+    @Test
+    void singleBannedWordInMultiWordSentence() {
+        String[] input = {"this", "is", "a", "fuck", "sentence"};
+        String[] result = ChatUtility.filterWords(input);
+
+        assertArrayEquals(new String[]{"this", "is", "a", "bobba", "sentence"}, result);
+    }
+
+    @Test
+    void asterisks_areStrippedBeforeMatch() {
+        String[] input = {"f*ck"};
+        String[] result = ChatUtility.filterWords(input);
+
+        assertArrayEquals(new String[]{"bobba"}, result);
+    }
+}

Roseau-Server/src/main/java/org/alexdev/roseau/messages/incoming/TALK.java

@@ -28,6 +28,7 @@ public void handle(Player player, ClientMessage reader) {
 		}
 
 		String talkMessage = Util.filterInput(reader.getMessageBody());
+		talkMessage = String.join(" ", ChatUtility.filterWords(talkMessage.split(" ")));
 
 		if (!reader.getHeader().equals("CHAT") && !reader.getHeader().equals("SHOUT")  && !reader.getHeader().equals("WHISPER")) {
 			return;

roseau.properties

@@ -19,3 +19,7 @@ log.errors=true
 log.output=true
 log.connections=true
 log.packets=true
+
+[Chat]
+filter.words=fuck,sex,porn
+filter.replacement=bobba