BP_REST_Forums_Endpoint::get_forum_action_states( int $forum_id )

	public function get_forum_action_states( $forum_id ) {
		if ( empty( $forum_id ) ) {
			return;
		}

		$forum_id = (int) $forum_id;
		$user_id  = bbp_get_user_id( 0, true, true );

		$state = array(
			'subscribed' => false,
		);

		if ( bbp_is_subscriptions_active() && current_user_can( 'edit_user', $user_id ) ) {
			$state['subscribed'] = bbp_is_user_subscribed( $user_id, $forum_id );
		}

		return $state;
	}