0.4:

compact request/response support - may not be final format
Fix NPE if no ip parameter

build.xml

@@ -11,7 +11,7 @@
         <delete file="plugin/i2ptunnel.config" />
         <!-- get version number -->
         <buildnumber file="scripts/build.number" />
-        <property name="release.number" value="0.3" />
+        <property name="release.number" value="0.4" />
 
         <!-- make the update xpi2p -->
         <!-- this contains everything except i2ptunnel.config -->

src/java/net/i2p/zzzot/Peer.java

@@ -20,7 +20,10 @@ import java.io.UnsupportedEncodingException;
 import java.util.HashMap;
 import java.util.concurrent.ConcurrentHashMap;
 
+import net.i2p.crypto.SHA256Generator;
+import net.i2p.data.Base64;
 import net.i2p.data.Destination;
+import net.i2p.data.Hash;
 import net.i2p.util.SimpleScheduler;
 import net.i2p.util.SimpleTimer;
 
@@ -70,6 +73,17 @@ public class Peer extends HashMap<String, Object> {
         return lastSeen;
     }
 
+    /** convert b64.i2p to a Hash, then to a binary string */
+    /* or should we just store it in the constructor? cache it? */
+    public String getHash() {
+        String ip = (String) get("ip");
+        byte[] b = Base64.decode(ip.substring(0, ip.length() - 4));
+        Hash h = SHA256Generator.getInstance().calculateHash(b);
+        try {
+            return new String(h.getData(), "ISO-8859-1");
+        } catch (UnsupportedEncodingException uee) { return null; }
+    }
+
     private static class Cleaner implements SimpleTimer.TimedEvent {
         public void timeReached() {
             destCache.clear();

src/jsp/announce.jsp

@@ -29,6 +29,7 @@
 	final int MAX_RESPONSES = 25;
 	final int INTERVAL = 27*60;
 	final boolean ALLOW_IP_MISMATCH = false;
+	final boolean ALLOW_COMPACT_RESPONSE = true;
 
 	// so the chars will turn into bytes correctly
 	request.setCharacterEncoding("ISO-8859-1");
@@ -48,6 +49,7 @@
 	String event = request.getParameter("event");
 	String ip = request.getParameter("ip");
 	String numwant = request.getParameter("numwant");
+	boolean compact = ALLOW_COMPACT_RESPONSE && request.getParameter("compact") != null;
 	// use to enforce destination
         String him = request.getHeader("X-I2P-DestB64");
         String xff = request.getHeader("X-Forwarded-For");
@@ -138,7 +140,7 @@
 
 	// spoof check
 	// if him == null, we are not using the I2P HTTP server tunnel, or something is wrong
-	boolean matchIP = ALLOW_IP_MISMATCH || him == null || ip.equals(him);
+	boolean matchIP = ALLOW_IP_MISMATCH || him == null || ip == null || ip.equals(him);
 	if (want <= 0 && (!matchIP) && !fail) {
 		fail = true;
 		msg = "ip mismatch";
@@ -199,7 +201,14 @@
 			peerlist.remove(p);   // them
 			if (want < size - 1) {
 				Collections.shuffle(peerlist);
-				m.put("peers", peerlist.subList(0, want));
+				peerlist = peerlist.subList(0, want);
+			}
+			if (compact) {
+				List<String> peerhashes = new ArrayList(peerlist.size());
+				for (Peer pe : peerlist) {
+					peerhashes.add(pe.getHash());
+				}
+				m.put("peers", peerhashes);
 			} else {
 				m.put("peers", peerlist);
 			}