Thinktecture Identity Server with OAuth Implicit Login - oauth

Question

I am trying to use javascript to login to identity server in OAuths Client. I can login and return to the return webpage successful.
I met a problem is why the Thinktecture identity sevrer always return '#' not '?' before parameters in querystring ,is that a bug?
the other question is how can I get the uses claims when I have access_token?

Answer 1

Implicit flow uses a hash fragment not a query string - that is not a bug (check the OAuth2 spec).
The client does not consume the access token in OAuth2 - it is opaque to the client - the access token is meant to be used by the backend.

Answer 2

I write a javascript function with regular expression to extract the "access_token" parameter as below:
var _access_token = getParameterByName('access_token');
function getParameterByName(name) {
var str = location.hash.substring(1);
var patt1 = new RegExp(name + "\\s*=\\s*([^&]+)", "g");
var result = patt1.exec(str);;
if (result == null)
return "";
else
return result[1];
}
then I try to use base64 to decode the access_token to get to extract the claims:
var Claims = base64decode(access_token)
function base64decode(input) {
var output = "";
var chr1, chr2, chr3;
var enc1, enc2, enc3, enc4;
var i = 0;
input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
while (i < input.length) {
enc1 = this._keyStr.indexOf(input.charAt(i++));
enc2 = this._keyStr.indexOf(input.charAt(i++));
enc3 = this._keyStr.indexOf(input.charAt(i++));
enc4 = this._keyStr.indexOf(input.charAt(i++));
chr1 = (enc1 << 2) | (enc2 >> 4);
chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
chr3 = ((enc3 & 3) << 6) | enc4;
output = output + String.fromCharCode(chr1);
if (enc3 != 64) {
output = output + String.fromCharCode(chr2);
}
if (enc4 != 64) {
output = output + String.fromCharCode(chr3);
}
}
output = Base64._utf8_decode(output);
return output;
}