Pass user preferred update channel to UpdateChecker

src/main/java/com/terraformersmc/modmenu/api/UpdateChannel.java

@@ -1,5 +1,8 @@
 package com.terraformersmc.modmenu.api;
 
+/**
+ * Supported update channels, in ascending order by stability.
+ */
 public enum UpdateChannel {
 	ALPHA,
 	BETA,

src/main/java/com/terraformersmc/modmenu/api/UpdateChecker.java

@@ -1,13 +1,14 @@
 package com.terraformersmc.modmenu.api;
 
 public interface UpdateChecker {
-
 	/**
 	 * Gets called when ModMenu is checking for updates.
 	 * This is done in a separate thread, so this call can/should be blocking.
 	 *
+	 * Your update checker should aim to return an update on the same or a more stable channel than requested.
+	 *
+	 * @param updateChannel The end user's preferred update channel.
 	 * @return The update info
 	 */
-	UpdateInfo checkForUpdates();
-
+	UpdateInfo checkForUpdates(UpdateChannel updateChannel);
 }

src/main/java/com/terraformersmc/modmenu/util/UpdateCheckerUtil.java

@@ -46,12 +46,14 @@ public static void checkForUpdates() {
 	}
 
 	public static void checkForCustomUpdates() {
+		UpdateChannel preferredChannel = ModMenuConfig.UPDATE_CHANNEL.getValue();
+
 		ModMenu.MODS.values().stream().filter(UpdateCheckerUtil::allowsUpdateChecks).forEach(mod -> {
 			UpdateChecker updateChecker = mod.getUpdateChecker();
 			if (updateChecker == null) {
 				return;
 			}
-			UpdateCheckerThread.run(mod, () -> mod.setUpdateInfo(updateChecker.checkForUpdates()));
+			UpdateCheckerThread.run(mod, () -> mod.setUpdateInfo(updateChecker.checkForUpdates(preferredChannel)));
 		});
 	}