Big refactor of the router console update subsystem, in preparation for

implementing out-of-console updaters like i2psnark.

- Add new update interfaces in net.i2p.update
- All update implementations moved to routerconsole update/
- Implement an UpdateManager that registers with the RouterContext
- UpdateManager handles multiple types of things to update
  (router, plugins, news, ...) and methods of updating (HTTP, ...)
- UpdateManager maintains list of installed, downloaded, and available versions of everything
- Define Updaters that can check for a new version and/or download an item
- Individual Updaters register with the UpdateManager obtained from
  I2PAppContext, identifying the type of update item and
  update method they can handle.
- Updaters need only core libs, no router.jar or routerconsole access required.
- All checks and updates are initiated via the UpdateManager.
- All status on checks and updates in-progress or completed are
  obtained from the UpdateManager. No more use of System properties
  to broadcast update state.
- All update and checker tasks are intantiated on demand and threaded;
  no more static references left over.
- Split out the Runners and Checkers from the Handlers and make the inheritance more sane.
- No more permanent NewsFetcher thread; run on the SimpleScheduler queue
  and thread a checker task only to fetch the news.
- No more static NewsFetcher instance in routerconsole.
  All helper methods that are still required are moved to NewsHelper.

The UpdateManager implements the policy for when to check and download.
All requests go through the UpdateManager.

For each update type, there's several parts:
    - The xxxUpdateHandler implements the Updater
    - The xxxUpdateChecker implements the UpdateTask for checking
    - The xxxUpdateRunner implements the UpdateTask for downloading

New and moved classes:

web/				update/
----				-------
new				ConsoleUpdateManager.java

new				PluginUpdateChecker.java from PluginUpdateChecker
PluginUpdateChecker 		-> PluginUpdateHandler.java
PluginUpdateHandler.java	-> PluginUpdateRunner

new				UnsignedUpdateHandler.java
UnsignedUpdateHandler		->  UnsignedUpdateRunner.java
new				UnsignedUpdateChecker from NewsFetcher

UpdateHandler.java remains
new				UpdateHandler.java
new				UpdateRunner.java from UpdateHandler

move				NewsHandler from NewsFetcher
new				NewsFetcher
new				NewsTimerTask

new				DummyHandler


Initial checkin. Unfinished, untested, unpolished.

apps/routerconsole/java/src/net/i2p/router/update/NewsTimerTask.java

@@ -0,0 +1,109 @@
+package net.i2p.router.update;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.text.SimpleDateFormat;
+import java.util.ArrayList;
+import java.util.Date;
+import java.util.List;
+
+import net.i2p.crypto.TrustedUpdate;
+import net.i2p.data.DataHelper;
+import net.i2p.router.Router;
+import net.i2p.router.RouterContext;
+import net.i2p.router.RouterVersion;
+import net.i2p.router.web.ConfigUpdateHandler;
+import net.i2p.router.web.ConfigUpdateHelper;
+import net.i2p.router.web.NewsHelper;
+import static net.i2p.update.UpdateType.*;
+import net.i2p.util.EepGet;
+import net.i2p.util.EepHead;
+import net.i2p.util.FileUtil;
+import net.i2p.util.Log;
+import net.i2p.util.SimpleScheduler;
+import net.i2p.util.SimpleTimer;
+
+/**
+ * Task to periodically look for updates to the news.xml, and to keep
+ * track of whether that has an announcement for a new version.
+ * Also looks for unsigned updates.
+ *
+ * Runs forever on instantiation, can't be stopped.
+ *
+ * @since 0.9.2 moved from NewsFetcher
+ */
+class NewsTimerTask implements SimpleTimer.TimedEvent {
+    private final RouterContext _context;
+    private final Log _log;
+    private final ConsoleUpdateManager _mgr;
+
+    private static final long INITIAL_DELAY = 5*60*1000;
+    private static final long RUN_DELAY = 10*60*1000;
+
+    public NewsTimerTask(RouterContext ctx) {
+        _context = ctx;
+        _log = ctx.logManager().getLog(NewsTimerTask.class);
+        _mgr = (ConsoleUpdateManager) _context.updateManager();
+        ctx.simpleScheduler().addPeriodicEvent(this,
+                                             INITIAL_DELAY + _context.random().nextLong(INITIAL_DELAY),
+                                             RUN_DELAY);
+        // UpdateManager calls NewsFetcher to check the existing news at startup
+    }
+
+    public void timeReached() {
+        if (shouldFetchNews()) {
+            fetchNews();
+            if (shouldFetchUnsigned())
+                fetchUnsignedHead();
+        }
+    }
+    
+    private boolean shouldFetchNews() {
+        if (_context.router().gracefulShutdownInProgress())
+            return false;
+        if (NewsHelper.isUpdateInProgress())
+            return false;
+        long lastFetch = NewsHelper.lastChecked(_context);
+        String freq = _context.getProperty(ConfigUpdateHandler.PROP_REFRESH_FREQUENCY,
+                                           ConfigUpdateHandler.DEFAULT_REFRESH_FREQUENCY);
+        try {
+            long ms = Long.parseLong(freq);
+            if (ms <= 0)
+                return false;
+            
+            if (lastFetch + ms < _context.clock().now()) {
+                return true;
+            } else {
+                if (_log.shouldLog(Log.DEBUG))
+                    _log.debug("Last fetched " + DataHelper.formatDuration(_context.clock().now() - lastFetch) + " ago");
+                return false;
+            }
+        } catch (NumberFormatException nfe) {
+            if (_log.shouldLog(Log.ERROR))
+                _log.error("Invalid refresh frequency: " + freq);
+            return false;
+        }
+    }
+
+    private void fetchNews() {
+        _mgr.check(NEWS, "");
+    }
+    
+    private boolean shouldFetchUnsigned() {
+        String url = _context.getProperty(ConfigUpdateHandler.PROP_ZIP_URL);
+        return url != null && url.length() > 0 &&
+               _context.getBooleanProperty(ConfigUpdateHandler.PROP_UPDATE_UNSIGNED) &&
+               !NewsHelper.dontInstall(_context);
+    }
+
+    /**
+     * HEAD the update url, and if the last-mod time is newer than the last update we
+     * downloaded, as stored in the properties, then we download it using eepget.
+     */
+    private void fetchUnsignedHead() {
+        _mgr.check(ROUTER_UNSIGNED, "");
+    }
+}