Port remaining login.spec.ts & soft_logout.spec.ts tests from Cypress to Playwright (#11917)

Co-authored-by: R Midhun Suresh <hi@midhun.dev>

playwright/plugins/oauth_server/index.ts

@@ -0,0 +1,72 @@
+/*
+Copyright 2023 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 http from "http";
+import express from "express";
+import { AddressInfo } from "net";
+
+export class OAuthServer {
+    private server?: http.Server;
+
+    public start(): number {
+        if (this.server) this.stop();
+
+        const app = express();
+
+        // static files. This includes the "authorization endpoint".
+        app.use(express.static(__dirname + "/res"));
+
+        // token endpoint (see https://openid.net/specs/openid-connect-core-1_0.html#TokenEndpoint)
+        app.use("/oauth/token", express.urlencoded({ extended: true }));
+        app.post("/oauth/token", (req, res) => {
+            // if the code is valid, accept it. Otherwise, return an error.
+            const code = req.body.code;
+            if (code === "valid_auth_code") {
+                res.send({
+                    access_token: "oauth_access_token",
+                    token_type: "Bearer",
+                    expires_in: "3600",
+                });
+            } else {
+                res.send({ error: "bad auth code" });
+            }
+        });
+
+        // userinfo endpoint (see https://openid.net/specs/openid-connect-core-1_0.html#UserInfo)
+        app.get("/oauth/userinfo", (req, res) => {
+            // TODO: validate that the request carries an auth header which matches the access token we issued above
+
+            // return an OAuth2 user info object
+            res.send({
+                sub: "alice",
+                name: "Alice",
+            });
+        });
+
+        this.server = http.createServer(app);
+        this.server.listen();
+        const address = this.server.address() as AddressInfo;
+        console.log(`Started OAuth server at ${address.address}:${address.port}`);
+        return address.port;
+    }
+
+    public stop(): void {
+        console.log("Stopping OAuth server");
+        const address = this.server.address() as AddressInfo;
+        this.server.close();
+        console.log(`Stopped OAuth server at ${address.address}:${address.port}`);
+    }
+}