michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: package org.mozilla.gecko.background.announcements;
michael@0: 
michael@0: import java.io.UnsupportedEncodingException;
michael@0: import java.net.URI;
michael@0: import java.net.URISyntaxException;
michael@0: import java.net.URLEncoder;
michael@0: 
michael@0: import org.mozilla.gecko.background.common.GlobalConstants;
michael@0: import org.mozilla.gecko.background.common.log.Logger;
michael@0: import org.mozilla.gecko.sync.net.BaseResource;
michael@0: 
michael@0: public class AnnouncementsFetcher {
michael@0:   private static final String LOG_TAG = "AnnounceFetch";
michael@0:   private static final long MILLISECONDS_PER_DAY = 24 * 60 * 60 * 1000;
michael@0: 
michael@0:   public static URI getSnippetURI(String base, String channel,
michael@0:                                   String version, String platform,
michael@0:                                   int idleDays)
michael@0:     throws URISyntaxException {
michael@0:     try {
michael@0:       final String c = URLEncoder.encode(channel, "UTF-8");
michael@0:       final String v = URLEncoder.encode(version, "UTF-8");
michael@0:       final String p = URLEncoder.encode(platform, "UTF-8");
michael@0:       final String s = base + c + "/" + v + "/" + p + ((idleDays == -1) ? "" : ("?idle=" + idleDays));
michael@0:       return new URI(s);
michael@0:     } catch (UnsupportedEncodingException e) {
michael@0:       // Nonsense.
michael@0:       return null;
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   public static URI getAnnounceURI(final String baseURL, final long lastLaunch) throws URISyntaxException {
michael@0:     final String channel = getChannel();
michael@0:     final String version = getVersion();
michael@0:     final String platform = getPlatform();
michael@0:     final int idleDays = getIdleDays(lastLaunch);
michael@0: 
michael@0:     Logger.debug(LOG_TAG, "Fetch URI: idle for " + idleDays + " days.");
michael@0:     return getSnippetURI(baseURL, channel, version, platform, idleDays);
michael@0:   }
michael@0: 
michael@0:   protected static String getChannel() {
michael@0:     return AnnouncementsConstants.ANNOUNCE_CHANNEL;
michael@0:   }
michael@0: 
michael@0:   protected static String getVersion() {
michael@0:     return GlobalConstants.MOZ_APP_VERSION;
michael@0:   }
michael@0: 
michael@0:   protected static String getPlatform() {
michael@0:     return GlobalConstants.ANDROID_CPU_ARCH;
michael@0:   }
michael@0: 
michael@0:   /**
michael@0:    * Return the number of days that we've been idle, assuming that we have a
michael@0:    * sane last launch time and the current time is within range. If no sane idle
michael@0:    * time can be returned, we return -1.
michael@0:    *
michael@0:    * @param lastLaunch
michael@0:    *          Time at which the browser was last launched, in milliseconds since epoch.
michael@0:    * @param now
michael@0:    *          Milliseconds since epoch for which idle time should be calculated.
michael@0:    * @return number of idle days, or -1 if out of range.
michael@0:    */
michael@0:   protected static int getIdleDays(final long lastLaunch, final long now) {
michael@0:     if (lastLaunch <= 0) {
michael@0:       return -1;
michael@0:     }
michael@0: 
michael@0:     if (now < GlobalConstants.BUILD_TIMESTAMP_MSEC) {
michael@0:       Logger.warn(LOG_TAG, "Current time " + now + " earlier than build date. Not calculating idle.");
michael@0:       return -1;
michael@0:     }
michael@0: 
michael@0:     if (now < lastLaunch) {
michael@0:       Logger.warn(LOG_TAG, "Current time " + now + " earlier than last launch! Not calculating idle.");
michael@0:       return -1;
michael@0:     }
michael@0: 
michael@0:     final long idleMillis = now - lastLaunch;
michael@0:     final int idleDays = (int) (idleMillis / MILLISECONDS_PER_DAY);
michael@0: 
michael@0:     if (idleDays > AnnouncementsConstants.MAX_SANE_IDLE_DAYS) {
michael@0:       Logger.warn(LOG_TAG, "Idle from " + lastLaunch + " until " + now +
michael@0:                            ", which is insane. Not calculating idle.");
michael@0:       return -1;
michael@0:     }
michael@0: 
michael@0:     return idleDays;
michael@0:   }
michael@0: 
michael@0:   /**
michael@0:    * Return the number of days that we've been idle, assuming that we have a
michael@0:    * sane last launch time and the current time is within range. If no sane idle
michael@0:    * time can be returned, we return -1.
michael@0:    * The current time will be calculated from {@link System#currentTimeMillis()}.
michael@0:    *
michael@0:    * @param lastLaunch
michael@0:    *          Unix timestamp at which the browser was last launched.
michael@0:    * @return number of idle days, or -1 if out of range.
michael@0:    */
michael@0:   protected static int getIdleDays(final long lastLaunch) {
michael@0:     final long now = System.currentTimeMillis();
michael@0:     return getIdleDays(lastLaunch, now);
michael@0:   }
michael@0: 
michael@0:   public static void fetchAnnouncements(URI uri, AnnouncementsFetchDelegate delegate) {
michael@0:     BaseResource r = new BaseResource(uri);
michael@0:     r.delegate = new AnnouncementsFetchResourceDelegate(r, delegate);
michael@0:     r.getBlocking();
michael@0:   }
michael@0: 
michael@0:   /**
michael@0:    * Synchronous.
michael@0:    */
michael@0:   public static void fetchAndProcessAnnouncements(long lastLaunch,
michael@0:                                                   AnnouncementsFetchDelegate delegate) {
michael@0:     final long now = System.currentTimeMillis();
michael@0:     Logger.debug(LOG_TAG, "Fetching announcements. Last launch: " + lastLaunch + "; now: " + now);
michael@0:     try {
michael@0:       final String base = delegate.getServiceURL();
michael@0:       final URI uri = getAnnounceURI(base, lastLaunch);
michael@0:       Logger.info(LOG_TAG, "Fetching announcements from " + uri.toASCIIString());
michael@0:       fetchAnnouncements(uri, delegate);
michael@0:     } catch (URISyntaxException e) {
michael@0:       Logger.warn(LOG_TAG, "Couldn't create URL.", e);
michael@0:       return;
michael@0:     }
michael@0:   }
michael@0: }