feat(express-sample): add express sample code

packages/express-sample/package.json

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+{
+  "name": "@logto/express-sample",
+  "version": "1.0.0-beta.0",
+  "license": "MIT",
+  "private": true,
+  "scripts": {
+    "start": "ts-node src/app.ts"
+  },
+  "dependencies": {
+    "@logto/express": "^1.0.0-beta.0",
+    "cookie-parser": "^1.4.6",
+    "express": "^4.18.1",
+    "express-session": "^1.17.3"
+  },
+  "devDependencies": {
+    "@silverhand/eslint-config": "^0.17.0",
+    "@silverhand/ts-config": "^0.14.0",
+    "@types/cookie-parser": "^1.4.3",
+    "@types/express": "^4.17.13",
+    "@types/express-session": "^1.17.5",
+    "@types/node": "^18.6.1",
+    "eslint": "^8.9.0",
+    "lint-staged": "^13.0.0",
+    "postcss": "^8.4.6",
+    "postcss-modules": "^4.3.0",
+    "prettier": "^2.5.1",
+    "stylelint": "^14.8.2",
+    "ts-node": "^10.9.1",
+    "typescript": "^4.5.5"
+  },
+  "eslintConfig": {
+    "extends": "@silverhand"
+  },
+  "stylelint": {
+    "extends": "@silverhand/eslint-config/.stylelintrc"
+  },
+  "prettier": "@silverhand/eslint-config/.prettierrc"
+}

packages/express-sample/src/app.ts

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+import http from 'http';
+
+import cookieParser from 'cookie-parser';
+import express, { Request, Response, NextFunction } from 'express';
+import session from 'express-session';
+
+import { logtoClient } from './logto';
+
+const requireAuth = async (request: Request, response: Response, next: NextFunction) => {
+  if (!request.user.isAuthenticated) {
+    response.redirect('/logto/sign-in');
+  }
+
+  next();
+};
+
+const app = express();
+app.use(cookieParser());
+app.use(session({ secret: 'keyboard cat', cookie: { maxAge: 14 * 24 * 60 * 60 } }));
+app.use(logtoClient.handleAuthRoutes());
+app.use(logtoClient.withLogto());
+
+app.get('/', (request, response) => {
+  response.setHeader('content-type', 'text/html');
+  response.end(
+    `<h1>Hello Logto</h1>
+      <div><a href="/logto/sign-in">Sign In</a></div>
+      <div><a href="/logto/sign-out">Sign Out</a></div>
+      <div><a href="/user">Profile</a></div>
+      <div><a href="/protected">Protected Resource</a></div>`
+  );
+});
+
+app.get('/user', (request, response) => {
+  response.json(request.user);
+});
+
+app.get('/protected', requireAuth, (request, response) => {
+  response.end('protected resource');
+});
+
+const server = http.createServer(app);
+server.listen(3000, () => {
+  console.log('Sample app listening on http://localhost:3000');
+});

packages/express-sample/src/logto.ts

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+import LogtoClient from '@logto/express';
+
+export const logtoClient = new LogtoClient({
+  appId: 'foo-traditional',
+  appSecret: 'TXxxky90RxGNFeStfP2xv--ZhsPoz9VGRn5PDbEI1iAACGZp6R_IN0iigujq42V5',
+  endpoint: 'https://logto.dev',
+  baseUrl: 'http://localhost:3000',
+});

packages/express-sample/tsconfig.json

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+{
+  "extends": "@silverhand/ts-config/tsconfig.base"
+}