News: New /news page and helper to show all news

WIP, not yet hooked in

apps/routerconsole/java/src/net/i2p/router/web/NewsFeedHelper.java

@@ -0,0 +1,81 @@
+package net.i2p.router.web;
+
+import java.text.DateFormat;
+import java.util.Collections;
+import java.util.Date;
+import java.util.List;
+import java.util.TimeZone;
+
+import net.i2p.I2PAppContext;
+import net.i2p.app.ClientAppManager;
+import net.i2p.router.news.NewsEntry;
+import net.i2p.router.news.NewsManager;
+
+
+/**
+ *  HTML-formatted full news entries
+ *
+ *  @since 0.9.23
+ */
+public class NewsFeedHelper extends HelperBase {
+    
+    private int _start = 0;
+    private int _limit = 3;
+
+    /**
+     *  @param limit less than or equal to zero means all
+     */
+    public void setLimit(int limit) {
+        _limit = limit;
+    }
+
+    public void setStart(int start) {
+        _start = start;
+    }
+
+    public String getEntries() {
+        return getEntries(_context, _start, _limit);
+    }
+
+    /**
+     *  @param max less than or equal to zero means all
+     *  @return non-null, "" if none
+     */
+    static String getEntries(I2PAppContext ctx, int start, int max) {
+        if (max <= 0)
+            max = Integer.MAX_VALUE;
+        StringBuilder buf = new StringBuilder(512);
+        List<NewsEntry> entries = Collections.emptyList();
+        ClientAppManager cmgr = ctx.clientAppManager();
+        if (cmgr != null) {
+            NewsManager nmgr = (NewsManager) cmgr.getRegisteredApp(NewsManager.APP_NAME);
+            if (nmgr != null)
+                entries = nmgr.getEntries();
+        }
+        if (!entries.isEmpty()) {
+            DateFormat fmt = DateFormat.getDateInstance(DateFormat.SHORT);
+            // the router sets the JVM time zone to UTC but saves the original here so we can get it
+            String systemTimeZone = ctx.getProperty("i2p.systemTimeZone");
+            if (systemTimeZone != null)
+                fmt.setTimeZone(TimeZone.getTimeZone(systemTimeZone));
+            int i = 0;
+            for (NewsEntry entry : entries) {
+                if (i++ < start)
+                    continue;
+                buf.append("<h3>");
+                if (entry.updated > 0) {
+                    Date date = new Date(entry.updated);
+                    buf.append(fmt.format(date))
+                       .append(": ");
+                }
+                buf.append(entry.title)
+                   .append("</h3>\n")
+                   .append(entry.content)
+                   .append("\n");
+                if (i >= start + max)
+                    break;
+            }
+        }
+        return buf.toString();
+    }
+}