Intercepter to disable client cache for all endpoints - ActFramework

DisableClientCacheInterceptor.java

import act.util.Global;
import org.joda.time.DateTimeZone;
import org.joda.time.LocalDateTime;
import org.joda.time.format.DateTimeFormat;
import org.joda.time.format.DateTimeFormatter;
import org.osgl.$;
import org.osgl.aaa.NoAuthentication;
import org.osgl.http.H;
import org.osgl.mvc.annotation.After;
import org.osgl.util.S;
import org.osgl.web.util.UserAgent;

import java.util.Locale;

import static org.osgl.http.H.Header.Names.*;

public class DisableClientCacheInterceptor {

    @After
    @Global
    @NoAuthentication
    public void disableClientCache(H.Response response, UserAgent userAgent) {
        response.header(CACHE_CONTROL, "no-cache, no-store, must-revalidate, proxy-revalidate, post-check=0, pre-check=0, max-age=0");
        if (userAgent.isSafari()) {
            response.header(EXPIRES, "Sun, 19 Nov 1978 05:00:00 GMT");
            response.header(LAST_MODIFIED, lastModified($.ms()));
            response.header(ETAG, S.string($.ms()));
        }
    }

    private static String lastModified(long expirationInMillis) {
        LocalDateTime localDateTime = new LocalDateTime(expirationInMillis, DateTimeZone.UTC);
        DateTimeFormatter format = DateTimeFormat.forPattern("E, dd MMM Y HH:mm:ss").withLocale(Locale.ENGLISH);
        return format.print(localDateTime) + " GMT";
    }

}