Instance from an AuthToken.
Source
ManagedToken.fromToken(AuthToken t) : super() {
var tokenResourceOwner = this
.entity
.relationships["resourceOwner"]
.destinationEntity
.newInstance();
tokenResourceOwner["id"] = t.resourceOwnerIdentifier;
this
..accessToken = t.accessToken
..refreshToken = t.refreshToken
..issueDate = t.issueDate
..expirationDate = t.expirationDate
..type = t.type
..scope = t.scopes?.map((s) => s.scopeString)?.join(" ")
..resourceOwner = tokenResourceOwner as dynamic
..client = (new ManagedClient()..id = t.clientID);
}