1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/mobile/android/base/background/fxa/SkewHandler.java Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,111 @@
1.4 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.5 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.6 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.7 +
1.8 +package org.mozilla.gecko.background.fxa;
1.9 +
1.10 +import java.net.URI;
1.11 +import java.net.URISyntaxException;
1.12 +import java.util.HashMap;
1.13 +
1.14 +import org.mozilla.gecko.background.common.log.Logger;
1.15 +import org.mozilla.gecko.sync.net.Resource;
1.16 +
1.17 +import ch.boye.httpclientandroidlib.Header;
1.18 +import ch.boye.httpclientandroidlib.HttpHeaders;
1.19 +import ch.boye.httpclientandroidlib.HttpResponse;
1.20 +import ch.boye.httpclientandroidlib.impl.cookie.DateParseException;
1.21 +import ch.boye.httpclientandroidlib.impl.cookie.DateUtils;
1.22 +
1.23 +public class SkewHandler {
1.24 + private static final String LOG_TAG = "SkewHandler";
1.25 + protected volatile long skewMillis = 0L;
1.26 + protected final String hostname;
1.27 +
1.28 + private static final HashMap<String, SkewHandler> skewHandlers = new HashMap<String, SkewHandler>();
1.29 +
1.30 + public static SkewHandler getSkewHandlerForResource(final Resource resource) {
1.31 + return getSkewHandlerForHostname(resource.getHostname());
1.32 + }
1.33 +
1.34 + public static SkewHandler getSkewHandlerFromEndpointString(final String url) throws URISyntaxException {
1.35 + if (url == null) {
1.36 + throw new IllegalArgumentException("url must not be null.");
1.37 + }
1.38 + URI u = new URI(url);
1.39 + return getSkewHandlerForHostname(u.getHost());
1.40 + }
1.41 +
1.42 + public static synchronized SkewHandler getSkewHandlerForHostname(final String hostname) {
1.43 + SkewHandler handler = skewHandlers.get(hostname);
1.44 + if (handler == null) {
1.45 + handler = new SkewHandler(hostname);
1.46 + skewHandlers.put(hostname, handler);
1.47 + }
1.48 + return handler;
1.49 + }
1.50 +
1.51 + public static synchronized void clearSkewHandlers() {
1.52 + skewHandlers.clear();
1.53 + }
1.54 +
1.55 + public SkewHandler(final String hostname) {
1.56 + this.hostname = hostname;
1.57 + }
1.58 +
1.59 + public boolean updateSkewFromServerMillis(long millis, long now) {
1.60 + skewMillis = millis - now;
1.61 + Logger.debug(LOG_TAG, "Updated skew: " + skewMillis + "ms for hostname " + this.hostname);
1.62 + return true;
1.63 + }
1.64 +
1.65 + public boolean updateSkewFromHTTPDateString(String date, long now) {
1.66 + try {
1.67 + final long millis = DateUtils.parseDate(date).getTime();
1.68 + return updateSkewFromServerMillis(millis, now);
1.69 + } catch (DateParseException e) {
1.70 + Logger.warn(LOG_TAG, "Unexpected: invalid Date header from " + this.hostname);
1.71 + return false;
1.72 + }
1.73 + }
1.74 +
1.75 + public boolean updateSkewFromDateHeader(Header header, long now) {
1.76 + String date = header.getValue();
1.77 + if (null == date) {
1.78 + Logger.warn(LOG_TAG, "Unexpected: null Date header from " + this.hostname);
1.79 + return false;
1.80 + }
1.81 + return updateSkewFromHTTPDateString(date, now);
1.82 + }
1.83 +
1.84 + /**
1.85 + * Update our tracked skew value to account for the local clock differing from
1.86 + * the server's.
1.87 + *
1.88 + * @param response
1.89 + * the received HTTP response.
1.90 + * @param now
1.91 + * the current time in milliseconds.
1.92 + * @return true if the skew value was updated, false otherwise.
1.93 + */
1.94 + public boolean updateSkew(HttpResponse response, long now) {
1.95 + Header header = response.getFirstHeader(HttpHeaders.DATE);
1.96 + if (null == header) {
1.97 + Logger.warn(LOG_TAG, "Unexpected: missing Date header from " + this.hostname);
1.98 + return false;
1.99 + }
1.100 + return updateSkewFromDateHeader(header, now);
1.101 + }
1.102 +
1.103 + public long getSkewInMillis() {
1.104 + return skewMillis;
1.105 + }
1.106 +
1.107 + public long getSkewInSeconds() {
1.108 + return skewMillis / 1000;
1.109 + }
1.110 +
1.111 + public void resetSkew() {
1.112 + skewMillis = 0L;
1.113 + }
1.114 +}
1.115 \ No newline at end of file
