add indexes to copayer

lib/model/copayer.js

@@ -24,6 +24,24 @@ Copayer.prototype.getSigningPubKey = function () {
   return HDPublicKey.fromString(this.xPubKey).derive(MESSAGE_SIGNING_PATH).publicKey.toString();
 };
 
+Copayer.prototype.addAddress = function (isChange) {
+  if (isChange) {
+    this.changeAddressIndex++;
+  } else {
+    this.receiveAddressIndex++;
+  }
+};
+
+
+Copayer.prototype.getCurrentAddressPath = function (isChange) {
+  return 
+};
+
+Copayer.prototype.getNewAddressPath = function (isChange) {
+  this.addAddress(isChange);
+  return this.currentAddressPath(isChange);
+};
+
 Copayer.fromObj = function (obj) {
   var x = new Copayer();
 

lib/server.js

@@ -139,6 +139,7 @@ CopayServer.prototype._verifySignature = function (text, signature, pubKey) {
         name: opts.name,
         xPubKey: opts.xPubKey,
         xPubKeySignature: opts.xPubKeySignature,
+        copayerIndex: wallet.copayers.length,
       });
       
       wallet.addCopayer(copayer);

test/integration.js

@@ -471,6 +471,9 @@ describe('Copay server', function() {
           should.not.exist(err);
           wallet.status.should.equal('complete');
           wallet.publicKeyRing.length.should.equal(3);
+          _.each([0,1,2], function(i) {
+            wallet.copayers[i].copayerIndex.should.equal(i);
+          });
           done();
         });
       });