feat: support new mod announcement command

chat/src/main/java/com/github/twitch4j/chat/ITwitchChat.java

@@ -251,4 +251,17 @@ default boolean unban(String channel, String user) {
         return this.sendMessage(channel, String.format("/unban %s", user));
     }
 
+    /**
+     * Send a mod announcement (accented message)
+     *
+     * @param channel the name of the channel to send the announcement in.
+     * @param message the message to be announced.
+     * @return whether the command was added to the queue
+     * @see <a href="https://twitter.com/TwitchSupport/status/1509634525982302208">Official Announcement</a>
+     */
+    @Unofficial
+    default boolean sendAnnouncement(String channel, String message) {
+        return this.sendMessage(channel, String.format("/announce %s", message));
+    }
+
 }

chat/src/main/java/com/github/twitch4j/chat/enums/AnnouncementColor.java

@@ -0,0 +1,27 @@
+package com.github.twitch4j.chat.enums;
+
+import com.fasterxml.jackson.annotation.JsonEnumDefaultValue;
+import com.github.twitch4j.common.annotation.Unofficial;
+
+@Unofficial
+public enum AnnouncementColor {
+
+    @JsonEnumDefaultValue
+    PRIMARY,
+    BLUE,
+    GREEN,
+    ORANGE,
+    PURPLE;
+
+    private static final AnnouncementColor[] COLORS = values();
+
+    @Unofficial
+    public static AnnouncementColor parseColor(String colorStr) {
+        for (AnnouncementColor color : COLORS) {
+            if (color.toString().equalsIgnoreCase(colorStr))
+                return color;
+        }
+        return PRIMARY;
+    }
+
+}

chat/src/main/java/com/github/twitch4j/chat/events/IRCEventHandler.java

@@ -2,9 +2,11 @@
 
 import com.github.philippheuer.events4j.core.EventManager;
 import com.github.twitch4j.chat.TwitchChat;
+import com.github.twitch4j.chat.enums.AnnouncementColor;
 import com.github.twitch4j.chat.enums.NoticeTag;
 import com.github.twitch4j.chat.events.channel.*;
 import com.github.twitch4j.chat.events.roomstate.*;
+import com.github.twitch4j.common.annotation.Unofficial;
 import com.github.twitch4j.common.enums.SubscriptionPlan;
 import com.github.twitch4j.common.events.domain.EventChannel;
 import com.github.twitch4j.common.events.domain.EventUser;
@@ -57,6 +59,7 @@ public IRCEventHandler(TwitchChat twitchChat) {
         // register event handlers
         eventManager.onEvent("twitch4j-chat-message-trigger", IRCMessageEvent.class, this::onChannelMessage);
         eventManager.onEvent("twitch4j-chat-whisper-trigger", IRCMessageEvent.class, this::onWhisper);
+        eventManager.onEvent("twitch4j-chat-announcement-trigger", IRCMessageEvent.class, this::onAnnouncement);
         eventManager.onEvent("twitch4j-chat-bits-badge-trigger", IRCMessageEvent.class, this::onBitsBadgeTier);
         eventManager.onEvent("twitch4j-chat-cheer-trigger", IRCMessageEvent.class, this::onChannelCheer);
         eventManager.onEvent("twitch4j-chat-sub-trigger", IRCMessageEvent.class, this::onChannelSubscription);
@@ -82,6 +85,20 @@ public IRCEventHandler(TwitchChat twitchChat) {
         eventManager.onEvent("twitch4j-chat-globaluserstate-trigger", IRCMessageEvent.class, this::onGlobalUserState);
     }
 
+    @Unofficial
+    public void onAnnouncement(IRCMessageEvent event) {
+        if ("USERNOTICE".equals(event.getCommandType()) && "announcement".equalsIgnoreCase(event.getTags().get("msg-id"))) {
+            // Load Info
+            EventChannel channel = event.getChannel();
+            EventUser user = event.getUser();
+            String message = event.getMessage().orElse("");
+            String color = event.getTagValue("msg-param-color").orElse(AnnouncementColor.PRIMARY.toString());
+
+            // Dispatch Event
+            eventManager.publish(new ModAnnouncementEvent(event, channel, user, message, AnnouncementColor.parseColor(color)));
+        }
+    }
+
     /**
      * ChatChannel Message Event
      * @param event IRCMessageEvent

chat/src/main/java/com/github/twitch4j/chat/events/channel/ModAnnouncementEvent.java

@@ -0,0 +1,63 @@
+package com.github.twitch4j.chat.events.channel;
+
+import com.github.twitch4j.chat.enums.AnnouncementColor;
+import com.github.twitch4j.chat.events.AbstractChannelEvent;
+import com.github.twitch4j.common.annotation.Unofficial;
+import com.github.twitch4j.common.events.domain.EventChannel;
+import com.github.twitch4j.common.events.domain.EventUser;
+import lombok.EqualsAndHashCode;
+import lombok.ToString;
+import lombok.Value;
+
+/**
+ * Fired when the broadcaster or a moderator publishes an accented message via {@code /announce}.
+ * <p>
+ * Since this event is not officially documented in the IRC guide, it could change or stop working at any time.
+ *
+ * @see <a href="https://twitter.com/TwitchSupport/status/1509634525982302208">Official Announcement</a>
+ */
+@Value
+@ToString(callSuper = true)
+@EqualsAndHashCode(callSuper = true)
+@Unofficial
+public class ModAnnouncementEvent extends AbstractChannelEvent {
+
+    /**
+     * The raw message event.
+     */
+    @ToString.Exclude
+    IRCMessageEvent messageEvent;
+
+    /**
+     * The user that made the announcement.
+     */
+    EventUser announcer;
+
+    /**
+     * The message being announced.
+     */
+    String message;
+
+    /**
+     * The color accent for the announcement.
+     */
+    AnnouncementColor color;
+
+    /**
+     * Event Constructor
+     *
+     * @param messageEvent The raw message event.
+     * @param channel      The channel that this event originates from.
+     * @param announcer    The user that made the announcement.
+     * @param message      The message being announced.
+     * @param color        The color accent for the announcement.
+     */
+    public ModAnnouncementEvent(IRCMessageEvent messageEvent, EventChannel channel, EventUser announcer, String message, AnnouncementColor color) {
+        super(channel);
+        this.messageEvent = messageEvent;
+        this.announcer = announcer;
+        this.message = message;
+        this.color = color;
+    }
+
+}