Best way to test/debug javascript mappers/policies in Keycloak

Question

I am new to Keycloak and have been trying to setup javascript based authz policies and client mappers. I was wondering what is the best way to debug such mappers or policies.

Right now, if there are any errors within the script I can only find out it in the server logs, but is there a way where we can use something like alert or console.log; in both cases the server logs mentions:

Caused by: <eval>:18 ReferenceError: "alert" is not defined
Caused by: <eval>:18 ReferenceError: "console" is not defined 

It will be really helpful if when the script runs , if i can atleast log the values of properties or attributes to check whats going on

Tetzel

Found the answer to this, keycloak uses Nashorn engine for js and we can use print() to print/logs the values in keycloak console – Tetzel

Answer 1

You can use

print("something");

you will see it in server logs

Avon

I wish there is a way to debug like regular java scripts, I need to inspect objects. When I pass headers in auth requests they are empty. – Tepid

Answer 2

You can start KeyCloak with Debug-Option, e.g. with the following script

#!/bin/bash
echo "Starting KeyCloak"
sh ./keycloak-4.7.0.Final/bin/standalone.sh --debug 6666

I used this to debug my java-mappers and java-provider. Perhaps it can also help for javascript.

Vena