raupachz

If your Amazon Cognito User Pool is configured with a Secret you need to append a SecretHash to the API's query argument. Otherwise you end up with error messages.

An error occurred (NotAuthorizedException) when calling the InitiateAuth operation: Client examplefoobar is configured for secret but secret was not received

Unfortunately the AWS Command Line Interface is unable to compute the SecretHash for you. Instead they provide you with a Python Script to do the computation for you.

You can also compute the SecretHash with OpenSSL. I do this in Bash Scripts. For example here is a little script to

raupachz

@Named
@SessionScoped
public class UserBean implements Serializable {

    private Map<String, Object> claims;

    @PostConstruct
    public void postConstruct() {
        FacesContext facesContext = FacesContext.getCurrentInstance();
        HttpServletRequest httpServletRequest = (HttpServletRequest) facesContext.getExternalContext().getRequest();

raupachz

public class JWT {

    private static ObjectMapper objectMapper = new ObjectMapper();

    public static Map<String, Object> of(String token) {
        String[] parts = token.split("\\.");
        String payload = parts[1];
        String json = new String(Base64.getUrlDecoder().decode(payload), StandardCharsets.UTF_8);
        TypeReference<HashMap<String,Object>> typeRef = new TypeReference<HashMap<String,Object>>() {};
        try {

raupachz

Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD

raupachz

import com.amazonaws.services.lambda.runtime.Context;
import com.amazonaws.services.lambda.runtime.RequestHandler;

public class LambdaFunction implements RequestHandler<Void, String> {

    private final long classloaderTime = System.currentTimeMillis();
    private final long constructorTime;
    private long methodTime;

    public LambdaFunction() {

raupachz

public class Cores {
  public Integer handle(Object o) {
    return Runtime.getRuntime().availableProcessors();
  }
}

raupachz

public class Prime {
    
    public int nth(int n) {
        int p = 2;
        
        for (int i = 0; i < n; ) {
            if (prime(p++)) {
                i++;
            }
        }

raupachz

import com.sun.mail.smtp.SMTPTransport;
import java.io.IOException;
import java.util.Properties;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Session;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

/**

raupachz

-----BEGIN PGP PUBLIC KEY BLOCK-----
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raupachz

### Keybase proof

I hereby claim:

  * I am raupachz on github.
  * I am raupach (https://keybase.io/raupach) on keybase.
  * I have a public key ASA5aglR8YssRwA-urEoMtWr9b2om5Y6mesKsEk7PnCvMAo

To claim this, I am signing this object: