Need some pointers with oauth 2.0 and sha256

[kahn-hubitat]

anybody have an example of some app code that does something like the following

thanks in advance

Authentication - Tesla JSON API (Unofficial) (timdorr.com)

[kahn-hubitat]

so far gave up on this for now unless some can figure out (other thread) why the first call to the api is not returning the correct results even though i get a 200 back?
Instead for now I made some changes to run a .py script on a server and push new token to my local qnap web server and refresh token from that when needed. I did solve the sha256 and base64 encoding which in itself took me a half a day. ie.. Here is the code for that if it helps anyone else.

import java.security.MessageDigest

String.metaClass.encodeURL = {
java.net.URLEncoder.encode(delegate, "UTF-8")
}

def giveMeKey(int length)
{
String alphabet = (('A'..'N')+('P'..'Z')+('a'..'k')+('m'..'z')+('2'..'9')).join()
key = new Random().with {
(1..length).collect { alphabet[ nextInt( alphabet.length() ) ] }.join()
}
return key
}

public static String sha256(String base) {
try{
MessageDigest digest = MessageDigest.getInstance("SHA-256");
byte[] hash = digest.digest(base.getBytes("UTF-8"));
StringBuffer hexString = new StringBuffer();

    for (int i = 0; i < hash.length; i++) {
        String hex = Integer.toHexString(0xff & hash[i]);
        if(hex.length() == 1) hexString.append('0');
        hexString.append(hex);
    }

    return hexString.toString();
} catch(Exception ex){
   throw new RuntimeException(ex);
}

}

log.debug "in Get token from login"
def verifier = giveMeKey(86).toString()

if (!state.internalState)
{
def internalState = UUID.randomUUID().toString()
state.internalState = internalState
log.info "Set internal state to $state.internalState"
}
else
{
log.info "Internal State = $state.internalState"
}

log.info " verifier = $verifier"

String challenge = sha256(verifier)
def b64Challenge = challenge.encodeAsBase64()

log.debug "before strip b4challenge = $b64Challenge"

int loc = b64Challenge.indexOf("=")
if (loc > 0)
{
   log.debug "found loc = $loc stripping off ="
   b64Challenge = b64Challenge.substring(0,loc-1)
}