docs(examples): add example with passport authentication

2026-01-09 15:08:12 -05:00 · 2020-05-22 08:30:13 +02:00
parent 2a1aa1c59c
commit 8f90ba9c67
7 changed files with 972 additions and 0 deletions
--- a/examples/passport-example/README.md
+++ b/examples/passport-example/README.md
@@ -0,0 +1,14 @@
+
+# Example with [Passport](http://www.passportjs.org/)
+
+This example shows how to retrieve the authentication context from a basic [Express](http://expressjs.com/) + [Passport](http://www.passportjs.org/) application.
+
+![Passport example](assets/passport_example.gif)
+
+## How to use
+
+```
+$ npm ci && npm start
+```
+
+And point your browser to `http://localhost:3000`. Optionally, specify a port by supplying the `PORT` env variable.
--- a/examples/passport-example/assets/passport_example.gif
+++ b/examples/passport-example/assets/passport_example.gif
--- a/examples/passport-example/index.html
+++ b/examples/passport-example/index.html
@@ -0,0 +1,31 @@
+<!doctype html>
+<html lang="en">
+    <head>
+        <meta charset="UTF-8">
+        <title>Passport example</title>
+    </head>
+    <body>
+        <p>Authenticated!</p>
+        <p>Socket ID: <span id="socketId"></span></p>
+        <p>Username: <span id="username"></span></p>
+        <form action="/logout" method="post">
+            <div>
+                <input type="submit" value="Log out" />
+            </div>
+        </form>
+        <script src="/socket.io/socket.io.js"></script>
+        <script>
+          const socket = io();
+          const socketIdSpan = document.getElementById("socketId");
+          const usernameSpan = document.getElementById("username");
+
+          socket.on('connect', () => {
+            socketIdSpan.innerText = socket.id;
+
+            socket.emit('whoami', (username) => {
+              usernameSpan.innerText = username;
+            });
+          });
+        </script>
+    </body>
+</html>
--- a/examples/passport-example/index.js
+++ b/examples/passport-example/index.js
@@ -0,0 +1,104 @@
+const app = require("express")();
+const server = require("http").createServer(app);
+const port = process.env.PORT || 3000;
+
+const session = require("express-session");
+const bodyParser = require("body-parser");
+const passport = require("passport");
+const LocalStrategy = require("passport-local").Strategy;
+
+const sessionMiddleware = session({ secret: "changeit", resave: false, saveUninitialized: false });
+app.use(sessionMiddleware);
+app.use(bodyParser.urlencoded({ extended: false }));
+app.use(passport.initialize());
+app.use(passport.session());
+
+const DUMMY_USER = {
+  id: 1,
+  username: "john",
+};
+
+passport.use(
+  new LocalStrategy((username, password, done) => {
+    if (username === "john" && password === "doe") {
+      console.log("authentication OK");
+      return done(null, DUMMY_USER);
+    } else {
+      console.log("wrong credentials");
+      return done(null, false);
+    }
+  })
+);
+
+app.get("/", (req, res) => {
+  const isAuthenticated = !!req.user;
+  if (isAuthenticated) {
+    console.log(`user is authenticated, session is ${req.session.id}`);
+  } else {
+    console.log("unknown user");
+  }
+  res.sendFile(isAuthenticated ? "index.html" : "login.html", { root: __dirname });
+});
+
+app.post(
+  "/login",
+  passport.authenticate("local", {
+    successRedirect: "/",
+    failureRedirect: "/",
+  })
+);
+
+app.post("/logout", (req, res) => {
+  console.log(`logout ${req.session.id}`);
+  const socketId = req.session.socketId;
+  if (socketId && io.of("/").connected[socketId]) {
+    console.log(`forcefully closing socket ${socketId}`);
+    io.sockets.connected[socketId].disconnect(true);
+  }
+  req.logout();
+  res.cookie("connect.sid", "", { expires: new Date() });
+  res.redirect("/");
+});
+
+passport.serializeUser((user, cb) => {
+  console.log(`serializeUser ${user.id}`);
+  cb(null, user.id);
+});
+
+passport.deserializeUser((id, cb) => {
+  console.log(`deserializeUser ${id}`);
+  cb(null, DUMMY_USER);
+});
+
+const io = require('socket.io')(server);
+
+// convert a connect middleware to a Socket.IO middleware
+const wrap = middleware => (socket, next) => middleware(socket.request, {}, next);
+
+io.use(wrap(sessionMiddleware));
+io.use(wrap(passport.initialize()));
+io.use(wrap(passport.session()));
+
+io.use((socket, next) => {
+  if (socket.request.user) {
+    next();
+  } else {
+    next(new Error('unauthorized'))
+  }
+});
+
+io.on('connect', (socket) => {
+  console.log(`new connection ${socket.id}`);
+  socket.on('whoami', (cb) => {
+    cb(socket.request.user ? socket.request.user.username : '');
+  });
+
+  const session = socket.request.session;
+  console.log(`saving sid ${socket.id} in session ${session.id}`);
+  session.socketId = socket.id;
+  session.save();
+});
+
+server.listen(port, () => {
+  console.log(`application is running at: http://localhost:${port}`);
+});
--- a/examples/passport-example/login.html
+++ b/examples/passport-example/login.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<html lang="en">
+    <head>
+        <meta charset="UTF-8">
+        <title>Passport example</title>
+    </head>
+    <body>
+        <p>Not authenticated</p>
+        <form action="/login" method="post">
+            <div>
+                <label>Username:</label>
+                <input type="text" name="username" />
+                <br/>
+            </div>
+            <div>
+                <label>Password:</label>
+                <input type="password" name="password" />
+            </div>
+            <div>
+                <input type="submit" value="Submit" />
+            </div>
+        </form>
+    </body>
+</html>
--- a/examples/passport-example/package-lock.json
+++ b/examples/passport-example/package-lock.json
@@ -0,0 +1,783 @@
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--- a/examples/passport-example/package.json
+++ b/examples/passport-example/package.json
@@ -0,0 +1,16 @@
+{
+  "name": "passport-example",
+  "version": "0.0.1",
+  "description": "Example with Passport (http://www.passportjs.org/)",
+  "dependencies": {
+    "body-parser": "~1.19.0",
+    "express": "~4.17.1",
+    "express-session": "~1.17.1",
+    "passport": "~0.4.1",
+    "passport-local": "~1.0.0",
+    "socket.io": "~2.3.0"
+  },
+  "scripts": {
+    "start": "node index.js"
+  }
+}