* add HOOK_POST_LOGOUT

* auth_remote: add config option AUTH_REMOTE_POST_LOGOUT_URL

classes/handler/public.php

@@ -296,8 +296,25 @@ class Handler_Public extends Handler {
 
 	function logout(): void {
 		if (validate_csrf($_POST["csrf_token"])) {
+
+			$login = $_SESSION["name"];
+			$user_id = $_SESSION["uid"];
+
 			UserHelper::logout();
-			header("Location: index.php");
+
+			$redirect_url = "";
+
+			PluginHost::getInstance()->run_hooks_callback(PluginHost::HOOK_POST_LOGOUT,
+				function ($result) use (&$redirect_url) {
+					if (!empty($result[0]))
+						$redirect_url = UrlHelper::validate($result[0]);
+				},
+				$login, $user_id);
+
+			if (!$redirect_url)
+				$redirect_url = get_self_url_prefix() . "/index.php";
+
+			header("Location: " . $redirect_url);
 		} else {
 			header("Content-Type: text/json");
 			print Errors::to_json(Errors::E_UNAUTHORIZED);

classes/plugin.php

@@ -670,4 +670,13 @@ abstract class Plugin {
 
 		return false;
 	}
+
+	/** Invoked after user logout, may override built-in behavior (redirect back to login page)
+	 *  @param string $login
+	 *  @param int $user_id
+	 * @return array<mixed> - [0] - if set, url to redirect to
+	*/
+	function hook_post_logout($login, $user_id) {
+		return [""];
+	}
 }

classes/pluginhost.php

@@ -195,6 +195,9 @@ class PluginHost {
 	/** @see Plugin::hook_pre_subscribe() */
 	const HOOK_PRE_SUBSCRIBE = "hook_pre_subscribe";
 
+	/** @see Plugin::hook_post_logout() */
+	const HOOK_POST_LOGOUT = "hook_post_logout";
+
 	const KIND_ALL = 1;
 	const KIND_SYSTEM = 2;
 	const KIND_USER = 3;