How do I look up a cognito user by their sub/UUID?

Question

I want to look up a user in my Cognito user pool by their sub, which as far as I can tell, is just their UUID. I would like to do this in Java within a Lambda function but c

Answer 1

Now it works. http://docs.aws.amazon.com/cognito-user-identity-pools/latest/APIReference/API_ListUsers.html

"sub" in list of supported attributes. Example for JavaScript:

var cog = new AWS.CognitoIdentityServiceProvider();

var filter = "sub = \"" + userSub + "\"";
var req = {
    "Filter": filter,
    "UserPoolId": "your pool id" // looks like us-east-9_KDFn1cvys
};

cog.listUsers(req, function(err, data) {
    if (err) {
        console.log(err);
    }
    else {
        if (data.Users.length === 1){ //as far as we search by sub, should be only one user.
            var user = data.Users[0];
            var attributes = data.Users[0].Attributes;
        } else {
            console.log("Something wrong.");
        }
    }
});