Which is the best way to set admin to your application?

Ori · December 4, 2020, 3:22pm

This is something the platform makes very easy, you can just grab the caller of a public method and run a check on it to allow admin-only access, eg:

public shared(msg) func doSomething() {
    if (isAdmin(msg.caller)) {
	...

msg.caller there is of type Principal. You could either store this Principal in an array/set of admin Principals, or you could have an admin status flag in the user’s profile. The isAdmin() function above could check for either of these.

A couple of examples from project repos:

github.com

hansl/journey/blob/8a0e45c4dee8f3f786ff7a7880e8bc8a10811144/src/journey/main.mo#L24


var users: [User] = [];
var uniqueId: Nat = 0;
func getUser(id: Principal): ?User {
    func predicate(u: User): Bool {
        u.id == id
    };
    Array.find(predicate, users)
};
func isAdmin(id: Principal): Bool {
    switch (getUser(id)) {
        case (null) {
            return false;
        };
        case (?u) {
            switch (u.role) {
                case (#admin) { return true; };
                case (_) { return false; };
            }
        }

Or

github.com

dfinity/linkedup/blob/91392e689c368ed9d941b983226c3a53990823a4/src/linkedup/utils.mo#L43


  public func includes(x: UserId, xs: [UserId]): Bool {
    func isX(y: UserId): Bool { x == y };
    switch (Array.find<UserId>(xs, isX)) {
      case (null) { false };
      case (_) { true };
    };
  };
  // Authorization
  let adminIds: [UserId] = [];
  public func isAdmin(userId: UserId): Bool {
    func identity(x: UserId): Bool { x == userId };
    Option.isSome(Array.find<UserId>(adminIds,identity))
  };
  public func hasAccess(userId: UserId, profile: Profile): Bool {
    userId == profile.id or isAdmin(userId)
  };
};

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Which is the best way to set admin to your application?

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