wekan/server/lib/utils.js

allowIsBoardAdmin = function(userId, board) {
	return board && board.hasAdmin(userId);
};

allowIsBoardMember = function(userId, board) {
	return board && board.hasMember(userId);
};

allowIsBoardMemberNonComment = function(userId, board) {
	return board && board.hasMember(userId) && !board.hasCommentOnly(userId);
};

allowIsBoardMemberByCard = function(userId, card) {
	const board = card.board();
	return board && board.hasMember(userId);
};