Quick and dirty version of a Basic auth interceptor for Feign

BasicAuthenticationInterceptor.java

import dagger.Module;
import dagger.Provides;
import feign.RequestInterceptor;
import feign.RequestTemplate;
import org.codehaus.groovy.runtime.EncodingGroovyMethods;

import java.nio.charset.StandardCharsets;

@Module(library = true)
public class BasicAuthenticationInterceptor implements RequestInterceptor {
    private final String value;

    public BasicAuthenticationInterceptor(final String username, final String password) {
        value = "Basic " + EncodingGroovyMethods.encodeBase64((username + ":" + password).getBytes(StandardCharsets.ISO_8859_1)).toString();
    }

    @Override
    public void apply(RequestTemplate template) {
        template.header("Authorization", value);
    }

    @Provides(type = Provides.Type.SET)
    public RequestInterceptor provideThis() {
        return this;
    }
}