Add MatrixClient.clearStores

- to clear both sets of storage on logout

src/client.js

@@ -156,8 +156,9 @@ function MatrixClient(opts) {
     this._notifTimelineSet = null;
 
     this._crypto = null;
+    this._cryptoStore = opts.cryptoStore;
     if (CRYPTO_ENABLED && Boolean(opts.sessionStore) &&
-            Boolean(opts.cryptoStore) &&
+            Boolean(this._cryptoStore) &&
             userId !== null && this.deviceId !== null) {
         this._crypto = new Crypto(
             this, this,
@@ -173,6 +174,25 @@ function MatrixClient(opts) {
 utils.inherits(MatrixClient, EventEmitter);
 utils.extend(MatrixClient.prototype, MatrixBaseApis.prototype);
 
+/**
+ * Clear any data out of the persistent stores used by the client.
+ *
+ * @returns {Promise} Promise which resolves when the stores have been cleared.
+ */
+MatrixClient.prototype.clearStores = function() {
+    if (this._clientRunning) {
+        throw new Error("Cannot clear stores while client is running");
+    }
+
+    const promises = [];
+
+    promises.push(this.store.deleteAllData());
+    if (this._cryptoStore) {
+        promises.push(this._cryptoStore.deleteAllData());
+    }
+    return q.all(promises);
+};
+
 /**
  * Get the user-id of the logged-in user
  *

src/crypto/store/indexeddb-crypto-store.js

@@ -88,6 +88,28 @@ export default class IndexedDBCryptoStore {
         });
         return this._dbPromise;
     }
+
+    /**
+     * Delete all data from this store.
+     *
+     * @returns {Promise} resolves when the store has been cleared.
+     */
+    deleteAllData() {
+        return new q.Promise((resolve, reject) => {
+            console.log(`Removing indexeddb instance: ${this._dbName}`);
+            const req = this._indexedDB.deleteDatabase(this._dbName);
+            req.onerror = (ev) => {
+                reject(new Error(
+                    "unable to delete indexeddb: " + ev.target.error,
+                ));
+            };
+
+            req.onsuccess = () => {
+                console.log(`Removed indexeddb instance: ${this._dbName}`);
+                resolve();
+            };
+        });
+    }
 }
 
 function createDatabase(db) {

src/crypto/store/memory-crypto-store.js

@@ -14,6 +14,8 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
+import q from 'q';
+
 /**
  * Internal module. in-memory storage for e2e.
  *
@@ -26,4 +28,13 @@ limitations under the License.
 export default class MemoryCryptoStore {
     constructor() {
     }
+
+    /**
+     * Delete all data from this store.
+     *
+     * @returns {Promise} Promise which resolves when the store has been cleared.
+     */
+    deleteAllData() {
+        return q();
+    }
 }