adam bien's blog

Basic Access Authentication is easy to implement with JAX-RS 2.0 and a ClientRequestFilter realization:

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import javax.ws.rs.client.ClientRequestContext;
import javax.ws.rs.client.ClientRequestFilter;
import javax.ws.rs.core.MultivaluedMap;
import javax.xml.bind.DatatypeConverter;

public class Authenticator implements ClientRequestFilter {

    private final String user;
    private final String password;

    public Authenticator(String user, String password) {
        this.user = user;
        this.password = password;
    }

    public void filter(ClientRequestContext requestContext) throws IOException {
        MultivaluedMap<String, Object> headers = requestContext.getHeaders();
        final String basicAuthentication = getBasicAuthentication();
        headers.add("Authorization", basicAuthentication);

    }

    private String getBasicAuthentication() {
        String token = this.user + ":" + this.password;
        try {
            return "BASIC " + DatatypeConverter.printBase64Binary(token.getBytes("UTF-8"));
        } catch (UnsupportedEncodingException ex) {
            throw new IllegalStateException("Cannot encode with UTF-8", ex);
        }
    }
}

A filter instance can be registered during the creation of the client:

import javax.ws.rs.client.Client;
import javax.ws.rs.client.ClientBuilder;

Client client = ClientBuilder.newClient().register(new Authenticator(user, password));
... = this.client.target(uri);

…and the authentication becomes transparent…

The code above was borrowed from the https://github.com/AdamBien/e2ftp project.

See you at Java EE Workshops at MUC Airport!