Log envelopes and session end events

Help debug bad session errors by logging some envelope info about the
message we are about to decrypt. With this, if there is a decryption
error (e.g., bad mac or no session) it is clear from the logs what
number and device message sent the bad message.

Also log when we send and receive end session messages and when we close
sessions for certain devices.

// FREEBIE

js/libtextsecure.js

@@ -36902,6 +36902,7 @@ MessageReceiver.prototype.extend({
         this.pending = this.pending.then(handleEnvelope, handleEnvelope);
     },
     handleEnvelope: function(envelope) {
+        console.log('envelope from', envelope.source + '.' + envelope.sourceDevice, envelope.timestamp.toNumber());
         if (envelope.type === textsecure.protobuf.Envelope.Type.RECEIPT) {
             return this.onDeliveryReceipt(envelope);
         } else if (envelope.content) {
@@ -36957,9 +36958,12 @@ MessageReceiver.prototype.extend({
         }.bind(this));
     },
     handleDataMessage: function(envelope, message, close_session) {
-        console.log('data message from', envelope.source + '.' + envelope.sourceDevice, envelope.timestamp.toNumber());
+        var encodedNumber = envelope.source + '.' + envelope.sourceDevice;
+        console.log('data message from', encodedNumber, envelope.timestamp.toNumber());
         if ((message.flags & textsecure.protobuf.DataMessage.Flags.END_SESSION) ==
                 textsecure.protobuf.DataMessage.Flags.END_SESSION ) {
+            console.log('got end session');
+            console.log('closing session for device', encodedNumber);
             close_session();
         }
         return this.processDecrypted(message, envelope.source).then(function(message) {
@@ -37096,8 +37100,11 @@ MessageReceiver.prototype.extend({
 
             if ((finalMessage.flags & textsecure.protobuf.DataMessage.Flags.END_SESSION)
                     == textsecure.protobuf.DataMessage.Flags.END_SESSION &&
-                    finalMessage.sync !== null)
+                    finalMessage.sync !== null) {
+                console.log('got end session');
                 res[1]();
+                console.log('session closed for device', from);
+            }
 
             return this.processDecrypted(finalMessage);
         }.bind(this));
@@ -37545,12 +37552,14 @@ MessageSender.prototype = {
     },
 
     closeSession: function(number, timestamp) {
+        console.log('sending end session');
         var proto = new textsecure.protobuf.DataMessage();
         proto.body = "TERMINATE";
         proto.flags = textsecure.protobuf.DataMessage.Flags.END_SESSION;
         return this.sendIndividualProto(number, proto, timestamp).then(function(res) {
             return textsecure.storage.devices.getDeviceObjectsForNumber(number).then(function(devices) {
                 return Promise.all(devices.map(function(device) {
+                    console.log('closing session for', device.encodedNumber);
                     return textsecure.protocol_wrapper.closeOpenSessionForDevice(device.encodedNumber);
                 })).then(function() {
                     return res;

libtextsecure/message_receiver.js

@@ -85,6 +85,7 @@ MessageReceiver.prototype.extend({
         this.pending = this.pending.then(handleEnvelope, handleEnvelope);
     },
     handleEnvelope: function(envelope) {
+        console.log('envelope from', envelope.source + '.' + envelope.sourceDevice, envelope.timestamp.toNumber());
         if (envelope.type === textsecure.protobuf.Envelope.Type.RECEIPT) {
             return this.onDeliveryReceipt(envelope);
         } else if (envelope.content) {
@@ -140,9 +141,12 @@ MessageReceiver.prototype.extend({
         }.bind(this));
     },
     handleDataMessage: function(envelope, message, close_session) {
-        console.log('data message from', envelope.source + '.' + envelope.sourceDevice, envelope.timestamp.toNumber());
+        var encodedNumber = envelope.source + '.' + envelope.sourceDevice;
+        console.log('data message from', encodedNumber, envelope.timestamp.toNumber());
         if ((message.flags & textsecure.protobuf.DataMessage.Flags.END_SESSION) ==
                 textsecure.protobuf.DataMessage.Flags.END_SESSION ) {
+            console.log('got end session');
+            console.log('closing session for device', encodedNumber);
             close_session();
         }
         return this.processDecrypted(message, envelope.source).then(function(message) {
@@ -279,8 +283,11 @@ MessageReceiver.prototype.extend({
 
             if ((finalMessage.flags & textsecure.protobuf.DataMessage.Flags.END_SESSION)
                     == textsecure.protobuf.DataMessage.Flags.END_SESSION &&
-                    finalMessage.sync !== null)
+                    finalMessage.sync !== null) {
+                console.log('got end session');
                 res[1]();
+                console.log('session closed for device', from);
+            }
 
             return this.processDecrypted(finalMessage);
         }.bind(this));

libtextsecure/sendmessage.js

@@ -153,12 +153,14 @@ MessageSender.prototype = {
     },
 
     closeSession: function(number, timestamp) {
+        console.log('sending end session');
         var proto = new textsecure.protobuf.DataMessage();
         proto.body = "TERMINATE";
         proto.flags = textsecure.protobuf.DataMessage.Flags.END_SESSION;
         return this.sendIndividualProto(number, proto, timestamp).then(function(res) {
             return textsecure.storage.devices.getDeviceObjectsForNumber(number).then(function(devices) {
                 return Promise.all(devices.map(function(device) {
+                    console.log('closing session for', device.encodedNumber);
                     return textsecure.protocol_wrapper.closeOpenSessionForDevice(device.encodedNumber);
                 })).then(function() {
                     return res;