Clear session store when re-registering

When we re-register, our deviceId might change, which makes our sessions
are no longer valid since the recipient will see us as a new device.

Fixes #388

js/axolotl_store.js

@@ -228,6 +228,13 @@
                 });
             });
         },
+        clearSessionStore: function() {
+            return new Promise(function(resolve) {
+                var sessions = new SessionCollection();
+                sessions.sync('delete', sessions, {}).always(resolve);
+            });
+
+        },
         getIdentityKey: function(identifier) {
             if (identifier === null || identifier === undefined)
                 throw new Error("Tried to get identity key for undefined/null key");

js/libtextsecure.js

@@ -39204,11 +39204,13 @@ var TextSecureServer = (function() {
             return this.server.confirmCode(
                 number, verificationCode, password, signalingKey, registrationId, deviceName
             ).then(function(response) {
+                return textsecure.storage.axolotl.clearSessionStore().then(function() {
                     textsecure.storage.remove('identityKey');
                     textsecure.storage.remove('signaling_key');
                     textsecure.storage.remove('password');
                     textsecure.storage.remove('registrationId');
                     textsecure.storage.remove('number_id');
+                    textsecure.storage.remove('device_name');
                     textsecure.storage.remove('regionCode');
 
                     textsecure.storage.put('identityKey', identityKeyPair);
@@ -39220,6 +39222,7 @@ var TextSecureServer = (function() {
                     textsecure.storage.put('regionCode', libphonenumber.util.getRegionCodeForNumber(number));
                     this.server.username = textsecure.storage.get('number_id');
                 }.bind(this));
+            }.bind(this));
         },
         generateKeys: function (count, progressCallback) {
             if (typeof progressCallback !== 'function') {

libtextsecure/account_manager.js

@@ -97,11 +97,13 @@
             return this.server.confirmCode(
                 number, verificationCode, password, signalingKey, registrationId, deviceName
             ).then(function(response) {
+                return textsecure.storage.axolotl.clearSessionStore().then(function() {
                     textsecure.storage.remove('identityKey');
                     textsecure.storage.remove('signaling_key');
                     textsecure.storage.remove('password');
                     textsecure.storage.remove('registrationId');
                     textsecure.storage.remove('number_id');
+                    textsecure.storage.remove('device_name');
                     textsecure.storage.remove('regionCode');
 
                     textsecure.storage.put('identityKey', identityKeyPair);
@@ -113,6 +115,7 @@
                     textsecure.storage.put('regionCode', libphonenumber.util.getRegionCodeForNumber(number));
                     this.server.username = textsecure.storage.get('number_id');
                 }.bind(this));
+            }.bind(this));
         },
         generateKeys: function (count, progressCallback) {
             if (typeof progressCallback !== 'function') {

test/storage_test.js

@@ -114,6 +114,17 @@ describe("AxolotlStore", function() {
             });
         }).then(done,done);
     });
+    it ('clears the session store', function(done) {
+        var testRecord = "an opaque string";
+        store.putSession(identifier + '.1', testRecord).then(function() {
+            return store.clearSessionStore().then(function() {
+                return store.getSession(identifier + '.1').then(function(record) {
+                    assert.isUndefined(record);
+                });
+            });
+        }).then(done,done);
+
+    });
     it('returns deviceIds for a number', function(done) {
         var testRecord = "an opaque string";
         var devices = [1, 2, 3].map(function(deviceId) {