api: add clan ids and accessors

runelite-api/src/main/java/net/runelite/api/Client.java

@@ -1916,4 +1916,22 @@ public interface Client extends GameEngine
 	 */
 	@Nullable
 	ClanSettings getGuestClanSettings();
+
+	/**
+	 * Get clan channel by id.
+	 * @param clanId the clan id
+	 * @return
+	 * @see net.runelite.api.clan.ClanID
+	 */
+	@Nullable
+	ClanChannel getClanChannel(int clanId);
+
+	/**
+	 * Get clan settings by id
+	 * @param clanId the clan id
+	 * @return
+	 * @see net.runelite.api.clan.ClanID
+	 */
+	@Nullable
+	ClanSettings getClanSettings(int clanId);
 }

runelite-api/src/main/java/net/runelite/api/clan/ClanID.java

@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2021, Adam <Adam@sigterm.info>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+package net.runelite.api.clan;
+
+public final class ClanID
+{
+	/**
+	 * The primary clan.
+	 */
+	public static final int CLAN = 0;
+	/**
+	 * The group ironman clan.
+	 */
+	public static final int GROUP_IRONMAN = 1;
+}