Move auth steps to IdentityAuthClient

src/IdentityAuthClient.js

@@ -0,0 +1,60 @@
+/*
+Copyright 2019 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 MatrixClientPeg from './MatrixClientPeg';
+
+export default class IdentityAuthClient {
+    constructor() {
+        this.accessToken = null;
+    }
+
+    hasCredentials() {
+        return this.accessToken != null; // undef or null
+    }
+
+    // Returns a promise that resolves to the access_token string from the IS
+    async getAccessToken() {
+        let token = this.accessToken;
+        if (!token) {
+            token = window.localStorage.getItem("mx_is_access_token");
+        }
+
+        if (!token) {
+            return this.registerForToken();
+        }
+
+        try {
+            return await this._checkToken(token);
+        } catch (e) {
+            return await this.registerForToken();
+        }
+    }
+
+    _checkToken(token) {
+        // TODO: Test current API token via /account endpoint
+        return token;
+    }
+
+    async registerForToken() {
+        const hsOpenIdToken = await MatrixClientPeg.get().getOpenIdToken();
+        const { access_token: isAccessToken } =
+            await MatrixClientPeg.get().registerWithIdentityServer(hsOpenIdToken);
+        await this._checkToken(isAccessToken);
+        this.accessToken = isAccessToken;
+        window.localStorage.setItem("mx_is_access_token", isAccessToken);
+        return isAccessToken;
+    }
+}