Implement token login

Signed-off-by: RMidhunSuresh <rmidhunsuresh@gmail.com>

src/matrix/login/TokenLoginMethod.js

@@ -0,0 +1,29 @@
+/*
+Copyright 2021 The Matrix.org Foundation C.I.C.
+
+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 {LoginMethod} from "./LoginMethod.js";
+import {makeTxnId} from "../common.js";
+
+export class TokenLoginMethod extends LoginMethod {
+    constructor(options) {
+        super(options);
+        this._loginToken = options.loginToken;
+    }
+
+    async login(hsApi, deviceName, log) {
+        return await hsApi.tokenLogin(this._loginToken, makeTxnId(), deviceName, {log}).response();
+    }
+}

src/matrix/net/HomeServerApi.js

@@ -150,6 +150,18 @@ export class HomeServerApi {
         }, options);
     }
 
+    tokenLogin(loginToken, txnId, initialDeviceDisplayName, options = null) {
+        return this._unauthedRequest("POST", this._url("/login"), null, {
+          "type": "m.login.token",
+          "identifier": {
+            "type": "m.id.user",
+          },
+          "token": loginToken,
+          "txn_id": txnId,
+          "initial_device_display_name": initialDeviceDisplayName
+        }, options);
+    }
+
     createFilter(userId, filter, options = null) {
         return this._post(`/user/${encodeURIComponent(userId)}/filter`, null, filter, options);
     }