Merge remote-tracking branch 'upstream/dbkr/e2e_backups' into e2e_backups

CHANGELOG.md

@@ -1,3 +1,38 @@
+Changes in [0.11.1](https://github.com/matrix-org/matrix-js-sdk/releases/tag/v0.11.1) (2018-10-01)
+==================================================================================================
+[Full Changelog](https://github.com/matrix-org/matrix-js-sdk/compare/v0.11.1-rc.1...v0.11.1)
+
+ * No changes since rc.1
+
+Changes in [0.11.1-rc.1](https://github.com/matrix-org/matrix-js-sdk/releases/tag/v0.11.1-rc.1) (2018-09-27)
+============================================================================================================
+[Full Changelog](https://github.com/matrix-org/matrix-js-sdk/compare/v0.11.0...v0.11.1-rc.1)
+
+ * make usage of hub compatible with latest version (2.5)
+   [\#747](https://github.com/matrix-org/matrix-js-sdk/pull/747)
+ * Detect when lazy loading has been toggled in client.startClient
+   [\#746](https://github.com/matrix-org/matrix-js-sdk/pull/746)
+ * Add getMediaLimits to client
+   [\#644](https://github.com/matrix-org/matrix-js-sdk/pull/644)
+ * Split npm start into an init and watch script
+   [\#742](https://github.com/matrix-org/matrix-js-sdk/pull/742)
+ * Revert "room name should only take canonical alias into account"
+   [\#738](https://github.com/matrix-org/matrix-js-sdk/pull/738)
+ * fix display name disambiguation with LL
+   [\#737](https://github.com/matrix-org/matrix-js-sdk/pull/737)
+ * Introduce Room.myMembership event
+   [\#735](https://github.com/matrix-org/matrix-js-sdk/pull/735)
+ * room name should only take canonical alias into account
+   [\#733](https://github.com/matrix-org/matrix-js-sdk/pull/733)
+ * state events from context response were not wrapped in a MatrixEvent
+   [\#732](https://github.com/matrix-org/matrix-js-sdk/pull/732)
+ * Reduce amount of promises created when inserting members
+   [\#724](https://github.com/matrix-org/matrix-js-sdk/pull/724)
+ * dont wait for LL members to be stored to resolve the members
+   [\#726](https://github.com/matrix-org/matrix-js-sdk/pull/726)
+ * RoomState.members emitted with wrong argument order for OOB members
+   [\#728](https://github.com/matrix-org/matrix-js-sdk/pull/728)
+
 Changes in [0.11.0](https://github.com/matrix-org/matrix-js-sdk/releases/tag/v0.11.0) (2018-09-10)
 ==================================================================================================
 [Full Changelog](https://github.com/matrix-org/matrix-js-sdk/compare/v0.11.0-rc.1...v0.11.0)

package.json

@@ -1,6 +1,6 @@
 {
   "name": "matrix-js-sdk",
-  "version": "0.11.0",
+  "version": "0.11.1",
   "description": "Matrix Client-Server SDK for Javascript",
   "main": "index.js",
   "scripts": {
@@ -10,7 +10,9 @@
     "test": "npm run test:build && npm run test:run",
     "check": "npm run test:build && _mocha --recursive specbuild --colors",
     "gendoc": "babel --no-babelrc -d .jsdocbuild src && jsdoc -r .jsdocbuild -P package.json -R README.md -d .jsdoc",
-    "start": "babel -s -w -d lib src",
+    "start": "npm run start:init && npm run start:watch",
+    "start:watch": "babel -s -w --skip-initial-build -d lib src",
+    "start:init": "babel -s -d lib src",
     "clean": "rimraf lib dist",
     "build": "babel -s -d lib src && rimraf dist && mkdir dist && browserify -d browser-index.js | exorcist dist/browser-matrix.js.map > dist/browser-matrix.js && uglifyjs -c -m -o dist/browser-matrix.min.js --source-map dist/browser-matrix.min.js.map --in-source-map dist/browser-matrix.js.map dist/browser-matrix.js",
     "dist": "npm run build",
@@ -53,6 +55,7 @@
     "babel-runtime": "^6.26.0",
     "bluebird": "^3.5.0",
     "browser-request": "^0.3.3",
+    "bs58": "^4.0.1",
     "content-type": "^1.0.2",
     "request": "^2.53.0"
   },
@@ -72,8 +75,8 @@
     "jsdoc": "^3.5.5",
     "lolex": "^1.5.2",
     "matrix-mock-request": "^1.2.0",
-    "mocha": "^3.2.0",
+    "mocha": "^5.2.0",
-    "mocha-jenkins-reporter": "^0.3.6",
+    "mocha-jenkins-reporter": "^0.4.0",
     "rimraf": "^2.5.4",
     "source-map-support": "^0.4.11",
     "sourceify": "^0.1.0",

release.sh

@@ -245,7 +245,7 @@ release_text=`mktemp`
 echo "$tag" > "${release_text}"
 echo >> "${release_text}"
 cat "${latest_changes}" >> "${release_text}"
-hub release create $hubflags $assets -f "${release_text}" "$tag"
+hub release create $hubflags $assets -F "${release_text}" "$tag"
 
 if [ $dodist -eq 0 ]; then
     rm -rf "$builddir"
@@ -281,7 +281,7 @@ fi
 echo "updating master branch"
 git checkout master
 git pull
-git merge --ff-only "$rel_branch"
+git merge "$rel_branch"
 
 # push master  and docs (if generated) to github
 git push origin master

spec/integ/matrix-client-opts.spec.js

@@ -94,7 +94,7 @@ describe("MatrixClient opts", function() {
             httpBackend.flush("/txn1", 1);
         });
 
-        it("should be able to sync / get new events", function(done) {
+        it("should be able to sync / get new events", async function() {
             const expectedEventTypes = [ // from /initialSync
                 "m.room.message", "m.room.name", "m.room.member", "m.room.member",
                 "m.room.create",
@@ -110,20 +110,16 @@ describe("MatrixClient opts", function() {
             httpBackend.when("GET", "/pushrules").respond(200, {});
             httpBackend.when("POST", "/filter").respond(200, { filter_id: "foo" });
             httpBackend.when("GET", "/sync").respond(200, syncData);
-            client.startClient();
+            await client.startClient();
-            httpBackend.flush("/pushrules", 1).then(function() {
+            await httpBackend.flush("/pushrules", 1);
-                return httpBackend.flush("/filter", 1);
+            await httpBackend.flush("/filter", 1);
-            }).then(function() {
+            await Promise.all([
-                return Promise.all([
+                httpBackend.flush("/sync", 1),
-                    httpBackend.flush("/sync", 1),
+                utils.syncPromise(client),
-                    utils.syncPromise(client),
+            ]);
-                ]);
+            expect(expectedEventTypes.length).toEqual(
-            }).done(function() {
+                0, "Expected to see event types: " + expectedEventTypes,
-                expect(expectedEventTypes.length).toEqual(
+            );
-                    0, "Expected to see event types: " + expectedEventTypes,
-                );
-                done();
-            });
         });
     });
 

spec/unit/crypto.spec.js

@@ -1,20 +1,24 @@
 
 "use strict";
 import 'source-map-support/register';
+import Crypto from '../../lib/crypto';
+import expect from 'expect';
 
 const sdk = require("../..");
-let Crypto;
-if (sdk.CRYPTO_ENABLED) {
-    Crypto = require("../../lib/crypto");
-}
 
-import expect from 'expect';
+const Olm = global.Olm;
 
 describe("Crypto", function() {
     if (!sdk.CRYPTO_ENABLED) {
         return;
     }
+
+    beforeEach(function(done) {
+        Olm.init().then(done);
+    });
+
     it("Crypto exposes the correct olm library version", function() {
+        console.log(Crypto);
         expect(Crypto.getOlmVersion()[0]).toEqual(2);
     });
 });

spec/unit/crypto/algorithms/megolm.spec.js

@@ -13,20 +13,16 @@ import WebStorageSessionStore from '../../../../lib/store/session/webstorage';
 import MemoryCryptoStore from '../../../../lib/crypto/store/memory-crypto-store.js';
 import MockStorageApi from '../../../MockStorageApi';
 import testUtils from '../../../test-utils';
-
+import OlmDevice from '../../../../lib/crypto/OlmDevice';
-// Crypto and OlmDevice won't import unless we have global.Olm
+import Crypto from '../../../../lib/crypto';
-let OlmDevice;
-let Crypto;
-if (global.Olm) {
-    OlmDevice = require('../../../../lib/crypto/OlmDevice');
-    Crypto = require('../../../../lib/crypto');
-}
 
 const MatrixEvent = sdk.MatrixEvent;
 const MegolmDecryption = algorithms.DECRYPTION_CLASSES['m.megolm.v1.aes-sha2'];
 
 const ROOM_ID = '!ROOM:ID';
 
+const Olm = global.Olm;
+
 describe("MegolmDecryption", function() {
     if (!global.Olm) {
         console.warn('Not running megolm unit tests: libolm not present');
@@ -69,7 +65,8 @@ describe("MegolmDecryption", function() {
 
     describe('receives some keys:', function() {
         let groupSession;
-        beforeEach(function() {
+        beforeEach(async function() {
+            await Olm.init();
             groupSession = new global.Olm.OutboundGroupSession();
             groupSession.create();
 
@@ -98,7 +95,7 @@ describe("MegolmDecryption", function() {
                 },
             };
 
-            return event.attemptDecryption(mockCrypto).then(() => {
+            await event.attemptDecryption(mockCrypto).then(() => {
                 megolmDecryption.onRoomKeyEvent(event);
             });
         });

spec/unit/crypto/backup.spec.js

@@ -43,13 +43,14 @@ const MegolmDecryption = algorithms.DECRYPTION_CLASSES['m.megolm.v1.aes-sha2'];
 
 const ROOM_ID = '!ROOM:ID';
 
+const SESSION_ID = 'o+21hSjP+mgEmcfdslPsQdvzWnkdt0Wyo00Kp++R8Kc';
 const ENCRYPTED_EVENT = new MatrixEvent({
     type: 'm.room.encrypted',
     room_id: '!ROOM:ID',
     content: {
         algorithm: 'm.megolm.v1.aes-sha2',
         sender_key: 'SENDER_CURVE25519',
-        session_id: 'o+21hSjP+mgEmcfdslPsQdvzWnkdt0Wyo00Kp++R8Kc',
+        session_id: SESSION_ID,
         ciphertext: 'AwgAEjD+VwXZ7PoGPRS/H4kwpAsMp/g+WPvJVtPEKE8fmM9IcT/N'
             + 'CiwPb8PehecDKP0cjm1XO88k6Bw3D17aGiBHr5iBoP7oSw8CXULXAMTkBl'
             + 'mkufRQq2+d0Giy1s4/Cg5n13jSVrSb2q7VTSv1ZHAFjUCsLSfR0gxqcQs',
@@ -412,7 +413,7 @@ describe("MegolmBackup", function() {
                 "qx37WTQrjZLz5tId/uBX9B3/okqAbV1ofl9UnHKno1eipByCpXleAAlAZoJgYnCDOQZD"
                 + "QWzo3luTSfkF9pU1mOILCbbouubs6TVeDyPfgGD9i86J8irHjA",
                 ROOM_ID,
-                'o+21hSjP+mgEmcfdslPsQdvzWnkdt0Wyo00Kp++R8Kc',
+                SESSION_ID,
             ).then(() => {
                 return megolmDecryption.decryptEvent(ENCRYPTED_EVENT);
             }).then((res) => {
@@ -426,10 +427,10 @@ describe("MegolmBackup", function() {
                     rooms: {
                         [ROOM_ID]: {
                             sessions: {
-                                'o+21hSjP+mgEmcfdslPsQdvzWnkdt0Wyo00Kp++R8Kc': KEY_BACKUP_DATA,
+                                SESSION_ID: KEY_BACKUP_DATA,
                             },
                         },
-                    }
+                    },
                 });
             };
             return client.restoreKeyBackups(

spec/unit/matrix-client.spec.js

@@ -139,6 +139,9 @@ describe("MatrixClient", function() {
         store.getSavedSync = expect.createSpy().andReturn(Promise.resolve(null));
         store.getSavedSyncToken = expect.createSpy().andReturn(Promise.resolve(null));
         store.setSyncData = expect.createSpy().andReturn(Promise.resolve(null));
+        store.getClientOptions = expect.createSpy().andReturn(Promise.resolve(null));
+        store.storeClientOptions = expect.createSpy().andReturn(Promise.resolve(null));
+        store.isNewlyCreated = expect.createSpy().andReturn(Promise.resolve(true));
         client = new MatrixClient({
             baseUrl: "https://my.home.server",
             idBaseUrl: identityServerUrl,
@@ -182,7 +185,7 @@ describe("MatrixClient", function() {
         });
     });
 
-    it("should not POST /filter if a matching filter already exists", function(done) {
+    it("should not POST /filter if a matching filter already exists", async function() {
         httpLookups = [];
         httpLookups.push(PUSH_RULES_RESPONSE);
         httpLookups.push(SYNC_RESPONSE);
@@ -191,15 +194,19 @@ describe("MatrixClient", function() {
         const filter = new sdk.Filter(0, filterId);
         filter.setDefinition({"room": {"timeline": {"limit": 8}}});
         store.getFilter.andReturn(filter);
-        client.startClient();
+        const syncPromise = new Promise((resolve, reject) => {
-
+            client.on("sync", function syncListener(state) {
-        client.on("sync", function syncListener(state) {
+                if (state === "SYNCING") {
-            if (state === "SYNCING") {
+                    expect(httpLookups.length).toEqual(0);
-                expect(httpLookups.length).toEqual(0);
+                    client.removeListener("sync", syncListener);
-                client.removeListener("sync", syncListener);
+                    resolve();
-                done();
+                } else if (state === "ERROR") {
-            }
+                    reject(new Error("sync error"));
+                }
+            });
         });
+        await client.startClient();
+        await syncPromise;
     });
 
     describe("getSyncState", function() {
@@ -207,15 +214,18 @@ describe("MatrixClient", function() {
             expect(client.getSyncState()).toBe(null);
         });
 
-        it("should return the same sync state as emitted sync events", function(done) {
+        it("should return the same sync state as emitted sync events", async function() {
-            client.on("sync", function syncListener(state) {
+            const syncingPromise = new Promise((resolve) => {
-                expect(state).toEqual(client.getSyncState());
+                client.on("sync", function syncListener(state) {
-                if (state === "SYNCING") {
+                    expect(state).toEqual(client.getSyncState());
-                    client.removeListener("sync", syncListener);
+                    if (state === "SYNCING") {
-                    done();
+                        client.removeListener("sync", syncListener);
-                }
+                        resolve();
+                    }
+                });
             });
-            client.startClient();
+            await client.startClient();
+            await syncingPromise;
         });
     });
 
@@ -258,8 +268,8 @@ describe("MatrixClient", function() {
     });
 
     describe("retryImmediately", function() {
-        it("should return false if there is no request waiting", function() {
+        it("should return false if there is no request waiting", async function() {
-            client.startClient();
+            await client.startClient();
             expect(client.retryImmediately()).toBe(false);
         });
 

spec/unit/room.spec.js

@@ -1402,13 +1402,25 @@ describe("Room", function() {
         it("should return synced membership if membership isn't available yet",
         function() {
             const room = new Room(roomId, null, userA);
-            room.setSyncedMembership("invite");
+            room.updateMyMembership("invite");
             expect(room.getMyMembership()).toEqual("invite");
-            room.addLiveEvents([utils.mkMembership({
+        });
-                user: userA, mship: "join",
+        it("should emit a Room.myMembership event on a change",
-                room: roomId, event: true,
+        function() {
-            })]);
+            const room = new Room(roomId, null, userA);
+            const events = [];
+            room.on("Room.myMembership", (_room, membership, oldMembership) => {
+                events.push({membership, oldMembership});
+            });
+            room.updateMyMembership("invite");
+            expect(room.getMyMembership()).toEqual("invite");
+            expect(events[0]).toEqual({membership: "invite", oldMembership: null});
+            events.splice(0);   //clear
+            room.updateMyMembership("invite");
+            expect(events.length).toEqual(0);
+            room.updateMyMembership("join");
             expect(room.getMyMembership()).toEqual("join");
+            expect(events[0]).toEqual({membership: "join", oldMembership: "invite"});
         });
     });
 
@@ -1439,11 +1451,11 @@ describe("Room", function() {
         it("should return false if synced membership not join",
         function() {
             const room = new Room(roomId, null, userA);
-            room.setSyncedMembership("invite");
+            room.updateMyMembership("invite");
             expect(room.maySendMessage()).toEqual(false);
-            room.setSyncedMembership("leave");
+            room.updateMyMembership("leave");
             expect(room.maySendMessage()).toEqual(false);
-            room.setSyncedMembership("join");
+            room.updateMyMembership("join");
             expect(room.maySendMessage()).toEqual(true);
         });
     });

src/client.js

@@ -45,7 +45,15 @@ const olmlib = require("./crypto/olmlib");
 
 import ReEmitter from './ReEmitter';
 import RoomList from './crypto/RoomList';
+import {InvalidStoreError} from './errors';
 
+import Crypto from './crypto';
+import { isCryptoAvailable } from './crypto';
+import { encodeRecoveryKey, decodeRecoveryKey } from './crypto/recoverykey';
+
+// Disable warnings for now: we use deprecated bluebird functions
+// and need to migrate, but they spam the console with warnings.
+Promise.config({warnings: false});
 
 const LAZY_LOADING_MESSAGES_FILTER = {
     lazy_load_members: true,
@@ -59,14 +67,7 @@ const LAZY_LOADING_SYNC_FILTER = {
 
 
 const SCROLLBACK_DELAY_MS = 3000;
-let CRYPTO_ENABLED = false;
+const CRYPTO_ENABLED = isCryptoAvailable();
-
-try {
-    var Crypto = require("./crypto");
-    CRYPTO_ENABLED = true;
-} catch (e) {
-    console.warn("Unable to load crypto module: crypto will be disabled: " + e);
-}
 
 function keysFromRecoverySession(sessions, decryptionKey, roomId) {
     const keys = [];
@@ -164,6 +165,8 @@ function MatrixClient(opts) {
 
     MatrixBaseApis.call(this, opts);
 
+    this.olmVersion = null; // Populated after initCrypto is done
+
     this.reEmitter = new ReEmitter(this);
 
     this.store = opts.store || new StubStore();
@@ -216,10 +219,6 @@ function MatrixClient(opts) {
 
     this._forceTURN = opts.forceTURN || false;
 
-    if (CRYPTO_ENABLED) {
-        this.olmVersion = Crypto.getOlmVersion();
-    }
-
     // List of which rooms have encryption enabled: separate from crypto because
     // we still want to know which rooms are encrypted even if crypto is disabled:
     // we don't want to start sending unencrypted events to them.
@@ -409,6 +408,13 @@ MatrixClient.prototype.setNotifTimelineSet = function(notifTimelineSet) {
  * successfully initialised.
  */
 MatrixClient.prototype.initCrypto = async function() {
+    if (!isCryptoAvailable()) {
+        throw new Error(
+            `End-to-end encryption not supported in this js-sdk build: did ` +
+                `you remember to load the olm library?`,
+        );
+    }
+
     if (this._crypto) {
         console.warn("Attempt to re-initialise e2e encryption on MatrixClient");
         return;
@@ -426,13 +432,6 @@ MatrixClient.prototype.initCrypto = async function() {
     // initialise the list of encrypted rooms (whether or not crypto is enabled)
     await this._roomList.init();
 
-    if (!CRYPTO_ENABLED) {
-        throw new Error(
-            `End-to-end encryption not supported in this js-sdk build: did ` +
-                `you remember to load the olm library?`,
-        );
-    }
-
     const userId = this.getUserId();
     if (userId === null) {
         throw new Error(
@@ -464,6 +463,9 @@ MatrixClient.prototype.initCrypto = async function() {
 
     await crypto.init();
 
+    this.olmVersion = Crypto.getOlmVersion();
+
+
     // if crypto initialisation was successful, tell it to attach its event
     // handlers.
     crypto.registerEventHandlers(this);
@@ -887,9 +889,7 @@ MatrixClient.prototype.prepareKeyBackupVersion = function() {
             auth_data: {
                 public_key: publicKey,
             },
-            // FIXME: pickle isn't the right thing to use, but we don't have
+            recovery_key: encodeRecoveryKey(decryption.get_private_key()),
-            // anything else yet, so use it for now
-            recovery_key: decryption.pickle("secret_key"),
         };
     } finally {
         decryption.free();
@@ -996,26 +996,17 @@ MatrixClient.prototype.backupAllGroupSessions = function(version) {
     return this._crypto.backupAllGroupSessions(version);
 };
 
-MatrixClient.prototype.isValidRecoveryKey = function(decryptionKey) {
+MatrixClient.prototype.isValidRecoveryKey = function(recoveryKey) {
-    if (this._crypto === null) {
-        throw new Error("End-to-end encryption disabled");
-    }
-
-    const decryption = new global.Olm.PkDecryption();
     try {
-        // FIXME: see the FIXME in createKeyBackupVersion
+        decodeRecoveryKey(recoveryKey);
-        decryption.unpickle("secret_key", decryptionKey);
         return true;
     } catch (e) {
-        console.log(e);
         return false;
-    } finally {
-        decryption.free();
     }
 };
 
 MatrixClient.prototype.restoreKeyBackups = function(
-    decryptionKey, targetRoomId, targetSessionId, version,
+    recoveryKey, targetRoomId, targetSessionId, version,
 ) {
     if (this._crypto === null) {
         throw new Error("End-to-end encryption disabled");
@@ -1026,9 +1017,10 @@ MatrixClient.prototype.restoreKeyBackups = function(
     const path = this._makeKeyBackupPath(targetRoomId, targetSessionId, version);
 
     // FIXME: see the FIXME in createKeyBackupVersion
+    const privkey = decodeRecoveryKey(recoveryKey);
     const decryption = new global.Olm.PkDecryption();
     try {
-        decryption.unpickle("secret_key", decryptionKey);
+        decryption.init_with_private_key(privkey);
     } catch(e) {
         decryption.free();
         throw e;
@@ -1042,7 +1034,9 @@ MatrixClient.prototype.restoreKeyBackups = function(
                 if (!roomData.sessions) continue;
 
                 totalKeyCount += Object.keys(roomData.sessions).length;
-                const roomKeys = keysFromRecoverySession(roomData.sessions, decryption, roomId, roomKeys);
+                const roomKeys = keysFromRecoverySession(
+                    roomData.sessions, decryption, roomId, roomKeys,
+                );
                 for (const k of roomKeys) {
                     k.room_id = roomId;
                     keys.push(k);
@@ -2439,7 +2433,8 @@ MatrixClient.prototype.getEventTimeline = function(timelineSet, eventId) {
                                                self.getEventMapper()));
             timeline.getState(EventTimeline.FORWARDS).paginationToken = res.end;
         } else {
-            timeline.getState(EventTimeline.BACKWARDS).setUnknownStateEvents(res.state);
+            const stateEvents = utils.map(res.state, self.getEventMapper());
+            timeline.getState(EventTimeline.BACKWARDS).setUnknownStateEvents(stateEvents);
         }
         timelineSet.addEventsToTimeline(matrixEvents, true, timeline, res.start);
 
@@ -3441,6 +3436,9 @@ MatrixClient.prototype.startClient = async function(opts) {
     // shallow-copy the opts dict before modifying and storing it
     opts = Object.assign({}, opts);
 
+    if (opts.lazyLoadMembers && this.isGuest()) {
+        opts.lazyLoadMembers = false;
+    }
     if (opts.lazyLoadMembers) {
         const supported = await this.doesServerSupportLazyLoading();
         if (supported) {
@@ -3451,7 +3449,12 @@ MatrixClient.prototype.startClient = async function(opts) {
             opts.lazyLoadMembers = false;
         }
     }
-
+    // need to vape the store when enabling LL and wasn't enabled before
+    const shouldClear = await this._wasLazyLoadingToggled(opts.lazyLoadMembers);
+    if (shouldClear) {
+        const reason = InvalidStoreError.TOGGLED_LAZY_LOADING;
+        throw new InvalidStoreError(reason, !!opts.lazyLoadMembers);
+    }
     if (opts.lazyLoadMembers && this._crypto) {
         this._crypto.enableLazyLoading();
     }
@@ -3464,11 +3467,50 @@ MatrixClient.prototype.startClient = async function(opts) {
         return this._canResetTimelineCallback(roomId);
     };
     this._clientOpts = opts;
-
+    await this._storeClientOptions(this._clientOpts);
     this._syncApi = new SyncApi(this, opts);
     this._syncApi.sync();
 };
 
+/**
+ * Is the lazy loading option different than in previous session?
+ * @param {bool} lazyLoadMembers current options for lazy loading
+ * @return {bool} whether or not the option has changed compared to the previous session */
+MatrixClient.prototype._wasLazyLoadingToggled = async function(lazyLoadMembers) {
+    lazyLoadMembers = !!lazyLoadMembers;
+    // assume it was turned off before
+    // if we don't know any better
+    let lazyLoadMembersBefore = false;
+    const isStoreNewlyCreated = await this.store.isNewlyCreated();
+    if (!isStoreNewlyCreated) {
+        const prevClientOptions = await this.store.getClientOptions();
+        if (prevClientOptions) {
+            lazyLoadMembersBefore = !!prevClientOptions.lazyLoadMembers;
+        }
+        return lazyLoadMembersBefore !== lazyLoadMembers;
+    }
+    return false;
+};
+
+/**
+ * store client options with boolean/string/numeric values
+ * to know in the next session what flags the sync data was
+ * created with (e.g. lazy loading)
+ * @param {object} opts the complete set of client options
+ * @return {Promise} for store operation */
+MatrixClient.prototype._storeClientOptions = function(opts) {
+    const primTypes = ["boolean", "string", "number"];
+    const serializableOpts = Object.entries(opts)
+        .filter(([key, value]) => {
+            return primTypes.includes(typeof value);
+        })
+        .reduce((obj, [key, value]) => {
+            obj[key] = value;
+            return obj;
+        }, {});
+    return this.store.storeClientOptions(serializableOpts);
+};
+
 /**
  * High level helper method to stop the client from polling and allow a
  * clean shutdown.

src/crypto/OlmDevice.js

@@ -17,17 +17,6 @@ limitations under the License.
 
 import IndexedDBCryptoStore from './store/indexeddb-crypto-store';
 
-/**
- * olm.js wrapper
- *
- * @module crypto/OlmDevice
- */
-const Olm = global.Olm;
-if (!Olm) {
-    throw new Error("global.Olm is not defined");
-}
-
-
 // The maximum size of an event is 65K, and we base64 the content, so this is a
 // reasonable approximation to the biggest plaintext we can encrypt.
 const MAX_PLAINTEXT_LENGTH = 65536 * 3 / 4;
@@ -138,7 +127,7 @@ OlmDevice.prototype.init = async function() {
     await this._migrateFromSessionStore();
 
     let e2eKeys;
-    const account = new Olm.Account();
+    const account = new global.Olm.Account();
     try {
         await _initialiseAccount(
             this._sessionStore, this._cryptoStore, this._pickleKey, account,
@@ -172,7 +161,7 @@ async function _initialiseAccount(sessionStore, cryptoStore, pickleKey, account)
  * @return {array} The version of Olm.
  */
 OlmDevice.getOlmVersion = function() {
-    return Olm.get_library_version();
+    return global.Olm.get_library_version();
 };
 
 OlmDevice.prototype._migrateFromSessionStore = async function() {
@@ -279,7 +268,7 @@ OlmDevice.prototype._migrateFromSessionStore = async function() {
  */
 OlmDevice.prototype._getAccount = function(txn, func) {
     this._cryptoStore.getAccount(txn, (pickledAccount) => {
-        const account = new Olm.Account();
+        const account = new global.Olm.Account();
         try {
             account.unpickle(this._pickleKey, pickledAccount);
             func(account);
@@ -332,7 +321,7 @@ OlmDevice.prototype._getSession = function(deviceKey, sessionId, txn, func) {
  * @private
  */
 OlmDevice.prototype._unpickleSession = function(pickledSession, func) {
-    const session = new Olm.Session();
+    const session = new global.Olm.Session();
     try {
         session.unpickle(this._pickleKey, pickledSession);
         func(session);
@@ -365,7 +354,7 @@ OlmDevice.prototype._saveSession = function(deviceKey, session, txn) {
  * @private
  */
 OlmDevice.prototype._getUtility = function(func) {
-    const utility = new Olm.Utility();
+    const utility = new global.Olm.Utility();
     try {
         return func(utility);
     } finally {
@@ -477,7 +466,7 @@ OlmDevice.prototype.createOutboundSession = async function(
         ],
         (txn) => {
             this._getAccount(txn, (account) => {
-                const session = new Olm.Session();
+                const session = new global.Olm.Session();
                 try {
                     session.create_outbound(account, theirIdentityKey, theirOneTimeKey);
                     newSessionId = session.session_id();
@@ -521,7 +510,7 @@ OlmDevice.prototype.createInboundSession = async function(
         ],
         (txn) => {
             this._getAccount(txn, (account) => {
-                const session = new Olm.Session();
+                const session = new global.Olm.Session();
                 try {
                     session.create_inbound_from(
                         account, theirDeviceIdentityKey, ciphertext,
@@ -739,7 +728,7 @@ OlmDevice.prototype._getOutboundGroupSession = function(sessionId, func) {
         throw new Error("Unknown outbound group session " + sessionId);
     }
 
-    const session = new Olm.OutboundGroupSession();
+    const session = new global.Olm.OutboundGroupSession();
     try {
         session.unpickle(this._pickleKey, pickled);
         return func(session);
@@ -755,7 +744,7 @@ OlmDevice.prototype._getOutboundGroupSession = function(sessionId, func) {
  * @return {string} sessionId for the outbound session.
  */
 OlmDevice.prototype.createOutboundGroupSession = function() {
-    const session = new Olm.OutboundGroupSession();
+    const session = new global.Olm.OutboundGroupSession();
     try {
         session.create();
         this._saveOutboundGroupSession(session);
@@ -827,7 +816,7 @@ OlmDevice.prototype.getOutboundGroupSessionKey = function(sessionId) {
  * @return {*} result of func
  */
 OlmDevice.prototype._unpickleInboundGroupSession = function(sessionData, func) {
-    const session = new Olm.InboundGroupSession();
+    const session = new global.Olm.InboundGroupSession();
     try {
         session.unpickle(this._pickleKey, sessionData.session);
         return func(session);
@@ -908,7 +897,7 @@ OlmDevice.prototype.addInboundGroupSession = async function(
                     }
 
                     // new session.
-                    const session = new Olm.InboundGroupSession();
+                    const session = new global.Olm.InboundGroupSession();
                     try {
                         if (exportFormat) {
                             session.import_session(sessionKey);

src/crypto/index.js

@@ -36,9 +36,8 @@ const DeviceList = require('./DeviceList').default;
 import OutgoingRoomKeyRequestManager from './OutgoingRoomKeyRequestManager';
 import IndexedDBCryptoStore from './store/indexeddb-crypto-store';
 
-const Olm = global.Olm;
+export function isCryptoAvailable() {
-if (!Olm) {
+    return Boolean(global.Olm);
-    throw new Error("global.Olm is not defined");
 }
 
 /**
@@ -67,7 +66,7 @@ if (!Olm) {
  *
  * @param {RoomList} roomList An initialised RoomList object
  */
-function Crypto(baseApis, sessionStore, userId, deviceId,
+export default function Crypto(baseApis, sessionStore, userId, deviceId,
                 clientStore, cryptoStore, roomList) {
     this._baseApis = baseApis;
     this._sessionStore = sessionStore;
@@ -137,6 +136,10 @@ utils.inherits(Crypto, EventEmitter);
  * Returns a promise which resolves once the crypto module is ready for use.
  */
 Crypto.prototype.init = async function() {
+    // Olm is just an object with a .then, not a fully-fledged promise, so
+    // pass it into bluebird to make it a proper promise.
+    await global.Olm.init();
+
     const sessionStoreHasAccount = Boolean(this._sessionStore.getEndToEndAccount());
     let cryptoStoreHasAccount;
     await this._cryptoStore.doTxn(
@@ -1747,6 +1750,3 @@ class IncomingRoomKeyRequestCancellation {
  * @event module:client~MatrixClient#"crypto.warning"
  * @param {string} type One of the strings listed above
  */
-
-/** */
-module.exports = Crypto;

src/crypto/recoverykey.js

@@ -0,0 +1,67 @@
+/*
+Copyright 2018 New Vector Ltd
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import bs58 from 'bs58';
+
+// picked arbitrarily but to try & avoid clashing with any bitcoin ones
+// (also base58 encoded, albeit with a lot of hashing)
+const OLM_RECOVERY_KEY_PREFIX = [0x8B, 0x01];
+
+export function encodeRecoveryKey(key) {
+    const buf = new Uint8Array(OLM_RECOVERY_KEY_PREFIX.length + key.length + 1);
+    buf.set(OLM_RECOVERY_KEY_PREFIX, 0);
+    buf.set(key, OLM_RECOVERY_KEY_PREFIX.length);
+
+    let parity = 0;
+    for (let i = 0; i < buf.length - 1; ++i) {
+        parity ^= buf[i];
+    }
+    buf[buf.length - 1] = parity;
+    const base58key = bs58.encode(buf);
+
+
+    return base58key.match(/.{1,4}/g).join(" ");
+}
+
+export function decodeRecoveryKey(recoverykey) {
+    const result = bs58.decode(recoverykey.replace(/ /g, ''));
+
+    let parity = 0;
+    for (const b of result) {
+        parity ^= b;
+    }
+    if (parity !== 0) {
+        throw new Error("Incorrect parity");
+    }
+
+    for (let i = 0; i < OLM_RECOVERY_KEY_PREFIX.length; ++i) {
+        if (result[i] !== OLM_RECOVERY_KEY_PREFIX[i]) {
+            throw new Error("Incorrect prefix");
+        }
+    }
+
+    if (
+        result.length !==
+        OLM_RECOVERY_KEY_PREFIX.length + global.Olm.PRIVATE_KEY_LENGTH + 1
+    ) {
+        throw new Error("Incorrect length");
+    }
+
+    return result.slice(
+        OLM_RECOVERY_KEY_PREFIX.length,
+        OLM_RECOVERY_KEY_PREFIX.length + global.Olm.PRIVATE_KEY_LENGTH,
+    );
+}

src/errors.js

@@ -0,0 +1,25 @@
+// can't just do InvalidStoreError extends Error
+// because of http://babeljs.io/docs/usage/caveats/#classes
+function InvalidStoreError(reason, value) {
+    const message = `Store is invalid because ${reason}, ` +
+        `please delete all data and retry`;
+    const instance = Reflect.construct(Error, [message]);
+    Reflect.setPrototypeOf(instance, Reflect.getPrototypeOf(this));
+    instance.reason = reason;
+    instance.value = value;
+    return instance;
+}
+
+InvalidStoreError.TOGGLED_LAZY_LOADING = "TOGGLED_LAZY_LOADING";
+
+InvalidStoreError.prototype = Object.create(Error.prototype, {
+  constructor: {
+    value: Error,
+    enumerable: false,
+    writable: true,
+    configurable: true,
+  },
+});
+Reflect.setPrototypeOf(InvalidStoreError, Error);
+
+module.exports.InvalidStoreError = InvalidStoreError;

src/matrix.js

@@ -34,6 +34,8 @@ module.exports.SyncAccumulator = require("./sync-accumulator");
 module.exports.MatrixHttpApi = require("./http-api").MatrixHttpApi;
 /** The {@link module:http-api.MatrixError|MatrixError} class. */
 module.exports.MatrixError = require("./http-api").MatrixError;
+/** The {@link module:errors.InvalidStoreError|InvalidStoreError} class. */
+module.exports.InvalidStoreError = require("./errors").InvalidStoreError;
 /** The {@link module:client.MatrixClient|MatrixClient} class. */
 module.exports.MatrixClient = require("./client").MatrixClient;
 /** The {@link module:models/room|Room} class. */

src/models/room-state.js

@@ -180,7 +180,7 @@ RoomState.prototype.getSentinelMember = function(userId) {
         sentinel = new RoomMember(this.roomId, userId);
         const member = this.members[userId];
         if (member) {
-            sentinel.setMembershipEvent(member.events.member);
+            sentinel.setMembershipEvent(member.events.member, this);
         }
         this._sentinels[userId] = sentinel;
     }
@@ -501,7 +501,7 @@ RoomState.prototype._setOutOfBandMember = function(stateEvent) {
     }
 
     const member = this._getOrCreateMember(userId, stateEvent);
-    member.setMembershipEvent(stateEvent);
+    member.setMembershipEvent(stateEvent, this);
     // needed to know which members need to be stored seperately
     // as the are not part of the sync accumulator
     // this is cleared by setMembershipEvent so when it's updated through /sync

src/models/room.js

@@ -178,7 +178,7 @@ function Room(roomId, client, myUserId, opts) {
 
     // read by megolm; boolean value - null indicates "use global value"
     this._blacklistUnverifiedDevices = null;
-    this._syncedMembership = null;
+    this._selfMembership = null;
     this._summaryHeroes = null;
     // awaited by getEncryptionTargetMembers while room members are loading
 
@@ -198,7 +198,10 @@ utils.inherits(Room, EventEmitter);
  */
 Room.prototype.getVersion = function() {
     const createEvent = this.currentState.getStateEvents("m.room.create", "");
-    if (!createEvent) return null;
+    if (!createEvent) {
+        console.warn("Room " + this.room_id + " does not have an m.room.create event");
+        return '1';
+    }
     const ver = createEvent.getContent()['room_version'];
     if (ver === undefined) return '1';
     return ver;
@@ -257,13 +260,7 @@ Room.prototype.getLiveTimeline = function() {
  * @return {string} the membership type (join | leave | invite) for the logged in user
  */
 Room.prototype.getMyMembership = function() {
-    if (this.myUserId) {
+    return this._selfMembership;
-        const me = this.getMember(this.myUserId);
-        if (me) {
-            return me.membership;
-        }
-    }
-    return this._syncedMembership;
 };
 
 /**
@@ -278,7 +275,7 @@ Room.prototype.getDMInviter = function() {
             return me.getDMInviter();
         }
     }
-    if (this._syncedMembership === "invite") {
+    if (this._selfMembership === "invite") {
         // fall back to summary information
         const memberCount = this.getInvitedAndJoinedMemberCount();
         if (memberCount == 2 && this._summaryHeroes.length) {
@@ -362,8 +359,15 @@ Room.prototype.getAvatarFallbackMember = function() {
  * Sets the membership this room was received as during sync
  * @param {string} membership join | leave | invite
  */
-Room.prototype.setSyncedMembership = function(membership) {
+Room.prototype.updateMyMembership = function(membership) {
-    this._syncedMembership = membership;
+    const prevMembership = this._selfMembership;
+    this._selfMembership = membership;
+    if (prevMembership !== membership) {
+        if (membership === "leave") {
+            this._cleanupAfterLeaving();
+        }
+        this.emit("Room.myMembership", this, membership, prevMembership);
+    }
 };
 
 Room.prototype._loadMembersFromServer = async function() {
@@ -470,7 +474,7 @@ Room.prototype.clearLoadedMembersIfNeeded = async function() {
  * called when sync receives this room in the leave section
  * to do cleanup after leaving a room. Possibly called multiple times.
  */
-Room.prototype.onLeft = function() {
+Room.prototype._cleanupAfterLeaving = function() {
     this.clearLoadedMembersIfNeeded().catch((err) => {
         console.error(`error after clearing loaded members from ` +
             `room ${this.roomId} after leaving`);

src/store/indexeddb-local-backend.js

@@ -19,7 +19,7 @@ import Promise from 'bluebird';
 import SyncAccumulator from "../sync-accumulator";
 import utils from "../utils";
 
-const VERSION = 2;
+const VERSION = 3;
 
 function createDatabase(db) {
     // Make user store, clobber based on user ID. (userId property of User objects)
@@ -41,6 +41,12 @@ function upgradeSchemaV2(db) {
     oobMembersStore.createIndex("room", "room_id");
 }
 
+function upgradeSchemaV3(db) {
+    db.createObjectStore("client_options",
+        { keyPath: ["clobber"]});
+}
+
+
 /**
  * Helper method to collect results from a Cursor and promiseify it.
  * @param {ObjectStore|Index} store The store to perform openCursor on.
@@ -77,7 +83,7 @@ function txnAsPromise(txn) {
             resolve(event);
         };
         txn.onerror = function(event) {
-            reject(event);
+            reject(event.target.error);
         };
     });
 }
@@ -88,7 +94,7 @@ function reqAsEventPromise(req) {
             resolve(event);
         };
         req.onerror = function(event) {
-            reject(event);
+            reject(event.target.error);
         };
     });
 }
@@ -123,6 +129,7 @@ const LocalIndexedDBStoreBackend = function LocalIndexedDBStoreBackend(
     this.db = null;
     this._disconnected = true;
     this._syncAccumulator = new SyncAccumulator();
+    this._isNewlyCreated = false;
 };
 
 
@@ -153,11 +160,15 @@ LocalIndexedDBStoreBackend.prototype = {
                 `LocalIndexedDBStoreBackend.connect: upgrading from ${oldVersion}`,
             );
             if (oldVersion < 1) { // The database did not previously exist.
+                this._isNewlyCreated = true;
                 createDatabase(db);
             }
             if (oldVersion < 2) {
                 upgradeSchemaV2(db);
             }
+            if (oldVersion < 3) {
+                upgradeSchemaV3(db);
+            }
             // Expand as needed.
         };
 
@@ -185,6 +196,10 @@ LocalIndexedDBStoreBackend.prototype = {
             return this._init();
         });
     },
+    /** @return {bool} whether or not the database was newly created in this session. */
+    isNewlyCreated: function() {
+        return Promise.resolve(this._isNewlyCreated);
+    },
 
     /**
      * Having connected, load initial data from the database and prepare for use
@@ -529,6 +544,28 @@ LocalIndexedDBStoreBackend.prototype = {
             });
         });
     },
+
+    getClientOptions: function() {
+        return Promise.resolve().then(() => {
+            const txn = this.db.transaction(["client_options"], "readonly");
+            const store = txn.objectStore("client_options");
+            return selectQuery(store, undefined, (cursor) => {
+                if (cursor.value && cursor.value && cursor.value.options) {
+                    return cursor.value.options;
+                }
+            }).then((results) => results[0]);
+        });
+    },
+
+    storeClientOptions: async function(options) {
+        const txn = this.db.transaction(["client_options"], "readwrite");
+        const store = txn.objectStore("client_options");
+        store.put({
+            clobber: "-", // constant key so will always clobber
+            options: options,
+        }); // put == UPSERT
+        await txnAsPromise(txn);
+    },
 };
 
 export default LocalIndexedDBStoreBackend;

src/store/indexeddb-remote-backend.js

@@ -65,7 +65,10 @@ RemoteIndexedDBStoreBackend.prototype = {
     clearDatabase: function() {
         return this._ensureStarted().then(() => this._doCmd('clearDatabase'));
     },
-
+    /** @return {Promise<bool>} whether or not the database was newly created in this session. */
+    isNewlyCreated: function() {
+        return this._doCmd('isNewlyCreated');
+    },
     /**
      * @return {Promise} Resolves with a sync response to restore the
      * client state to where it was at the last save, or null if there
@@ -114,6 +117,14 @@ RemoteIndexedDBStoreBackend.prototype = {
         return this._doCmd('clearOutOfBandMembers', [roomId]);
     },
 
+    getClientOptions: function() {
+        return this._doCmd('getClientOptions');
+    },
+
+    storeClientOptions: function(options) {
+        return this._doCmd('storeClientOptions', [options]);
+    },
+
     /**
      * Load all user presence events from the database. This is not cached.
      * @return {Promise<Object[]>} A list of presence events in their raw form.
@@ -173,7 +184,9 @@ RemoteIndexedDBStoreBackend.prototype = {
             if (msg.command == 'cmd_success') {
                 def.resolve(msg.result);
             } else {
-                def.reject(msg.error);
+                const error = new Error(msg.error.message);
+                error.name = msg.error.name;
+                def.reject(error);
             }
         } else {
             console.warn("Unrecognised message from worker: " + msg);

src/store/indexeddb-store-worker.js

@@ -67,6 +67,9 @@ class IndexedDBStoreWorker {
             case 'connect':
                 prom = this.backend.connect();
                 break;
+            case 'isNewlyCreated':
+                prom = this.backend.isNewlyCreated();
+                break;
             case 'clearDatabase':
                 prom = this.backend.clearDatabase().then((result) => {
                     // This returns special classes which can't be cloned
@@ -101,10 +104,16 @@ class IndexedDBStoreWorker {
             case 'setOutOfBandMembers':
                 prom = this.backend.setOutOfBandMembers(msg.args[0], msg.args[1]);
                 break;
+            case 'getClientOptions':
+                prom = this.backend.getClientOptions();
+                break;
+            case 'storeClientOptions':
+                prom = this.backend.storeClientOptions(msg.args[0]);
+                break;
         }
 
         if (prom === undefined) {
-            postMessage({
+            this.postMessage({
                 command: 'cmd_fail',
                 seq: msg.seq,
                 // Can't be an Error because they're not structured cloneable
@@ -126,7 +135,10 @@ class IndexedDBStoreWorker {
                 command: 'cmd_fail',
                 seq: msg.seq,
                 // Just send a string because Error objects aren't cloneable
-                error: "Error running command",
+                error: {
+                    message: err.message,
+                    name: err.name,
+                },
             });
         });
     }

src/store/indexeddb.js

@@ -146,6 +146,11 @@ IndexedDBStore.prototype.getSavedSync = function() {
     return this.backend.getSavedSync();
 };
 
+/** @return {Promise<bool>} whether or not the database was newly created in this session. */
+IndexedDBStore.prototype.isNewlyCreated = function() {
+    return this.backend.isNewlyCreated();
+};
+
 /**
  * @return {Promise} If there is a saved sync, the nextBatch token
  * for this sync, otherwise null.
@@ -246,4 +251,12 @@ IndexedDBStore.prototype.clearOutOfBandMembers = function(roomId) {
     return this.backend.clearOutOfBandMembers(roomId);
 };
 
+IndexedDBStore.prototype.getClientOptions = function() {
+    return this.backend.getClientOptions();
+};
+
+IndexedDBStore.prototype.storeClientOptions = function(options) {
+    return this.backend.storeClientOptions(options);
+};
+
 module.exports.IndexedDBStore = IndexedDBStore;

src/store/memory.js

@@ -55,6 +55,7 @@ module.exports.MatrixInMemoryStore = function MatrixInMemoryStore(opts) {
     this._oobMembers = {
         // roomId: [member events]
     };
+    this._clientOptions = {};
 };
 
 module.exports.MatrixInMemoryStore.prototype = {
@@ -67,6 +68,10 @@ module.exports.MatrixInMemoryStore.prototype = {
         return this.syncToken;
     },
 
+    /** @return {Promise<bool>} whether or not the database was newly created in this session. */
+    isNewlyCreated: function() {
+        return Promise.resolve(true);
+    },
 
     /**
      * Set the token to stream from.
@@ -402,4 +407,13 @@ module.exports.MatrixInMemoryStore.prototype = {
         this._oobMembers[roomId] = membershipEvents;
         return Promise.resolve();
     },
+
+    getClientOptions: function() {
+        return Promise.resolve(this._clientOptions);
+    },
+
+    storeClientOptions: function(options) {
+        this._clientOptions = Object.assign({}, options);
+        return Promise.resolve();
+    },
 };

src/store/stub.js

@@ -32,6 +32,11 @@ function StubStore() {
 
 StubStore.prototype = {
 
+    /** @return {Promise<bool>} whether or not the database was newly created in this session. */
+    isNewlyCreated: function() {
+        return Promise.resolve(true);
+    },
+
     /**
      * Get the sync token.
      * @return {string}
@@ -276,6 +281,14 @@ StubStore.prototype = {
     clearOutOfBandMembers: function() {
         return Promise.resolve();
     },
+
+    getClientOptions: function() {
+        return Promise.resolve();
+    },
+
+    storeClientOptions: function() {
+        return Promise.resolve();
+    },
 };
 
 /** Stub Store class. */

src/sync.js

@@ -123,6 +123,7 @@ SyncApi.prototype.createRoom = function(roomId) {
                           "Room.timelineReset",
                           "Room.localEchoUpdated",
                           "Room.accountData",
+                          "Room.myMembership",
                          ]);
     this._registerStateListeners(room);
     return room;
@@ -976,9 +977,10 @@ SyncApi.prototype._processSyncResponse = async function(
     // Handle invites
     inviteRooms.forEach(function(inviteObj) {
         const room = inviteObj.room;
-        room.setSyncedMembership("invite");
         const stateEvents =
             self._mapSyncEventsFormat(inviteObj.invite_state, room);
+
+        room.updateMyMembership("invite");
         self._processRoomEvents(room, stateEvents);
         if (inviteObj.isBrandNewRoom) {
             room.recalculate();
@@ -993,7 +995,6 @@ SyncApi.prototype._processSyncResponse = async function(
     // Handle joins
     await Promise.mapSeries(joinRooms, async function(joinObj) {
         const room = joinObj.room;
-        room.setSyncedMembership("join");
         const stateEvents = self._mapSyncEventsFormat(joinObj.state, room);
         const timelineEvents = self._mapSyncEventsFormat(joinObj.timeline, room);
         const ephemeralEvents = self._mapSyncEventsFormat(joinObj.ephemeral);
@@ -1009,6 +1010,8 @@ SyncApi.prototype._processSyncResponse = async function(
             );
         }
 
+        room.updateMyMembership("join");
+
         joinObj.timeline = joinObj.timeline || {};
 
         if (joinObj.isBrandNewRoom) {
@@ -1116,8 +1119,6 @@ SyncApi.prototype._processSyncResponse = async function(
     // Handle leaves (e.g. kicked rooms)
     leaveRooms.forEach(function(leaveObj) {
         const room = leaveObj.room;
-        room.setSyncedMembership("leave");
-
         const stateEvents =
             self._mapSyncEventsFormat(leaveObj.state, room);
         const timelineEvents =
@@ -1125,6 +1126,8 @@ SyncApi.prototype._processSyncResponse = async function(
         const accountDataEvents =
             self._mapSyncEventsFormat(leaveObj.account_data);
 
+        room.updateMyMembership("leave");
+
         self._processRoomEvents(room, stateEvents, timelineEvents);
         room.addAccountData(accountDataEvents);
 
@@ -1145,8 +1148,6 @@ SyncApi.prototype._processSyncResponse = async function(
         accountDataEvents.forEach(function(e) {
             client.emit("event", e);
         });
-
-        room.onLeft();
     });
 
     // update the notification timeline, if appropriate.