我目前正在使用在线教程运行一个简单的测试 MEAN 堆栈:

• Node.js
• Express.js
• Passport .js

这是应用程序文件:

app.js

var express = require("express");
var mongoose = require("mongoose");
var path = require("path");
var bodyParser = require("body-parser");
var cookieParser = require("cookie-parser");
var session = require("express-session");
var flash = require("connect-flash");
var ejs = require("ejs");

var routes = require("./routes");

var app = express();

mongoose.connect("mongodb://localhost:27017/testdb");

app.set("port", process.env.PORT || 3000);

app.set("views", path.join(__dirname, "views"));
app.set("view engine", "ejs");

app.use(bodyParser.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(session({
    secret: "secret",
    resave: true,
    saveUninitialized: true
}));

app.use(flash());

app.use(routes);

app.listen(app.get("port"), function() {
    console.log("MEAN social media server started on port " + app.get("port"));
});

虽然这个app.js 文件中有 View ，但这里的重点是routes 变量所需的路由:

routes.js

var express = require("express");
var passport = require("passport");

var User = require("./models/user");

var router = express.Router();

router.use(function(req, res, next) {
    res.locals.currentUser = req.user;
    res.locals.errors = req.flash("error");
    res.locals.infos = req.flash("info");
    next();
});

router.get("/", function(req, res,next) {
    User.find()
        .sort({ createdAt: "descending" })
        .exec(function(err, users) {
            if (err) {
                return next(err);
            }
            res.render("index", { users: users });
        });
});

router.get("/signup", function(req, res) {
    res.render("signup");
});

router.post("/signup", function(req, res, next) {
    var username = req.body.username;
    var password = req.body.password;

    User.findOne({ username: username }, function(err, user) {
        if (err) {
            return next(err);
        }
        if (user) {
            req.flash("error", "User already exists");
            return res.redirect("/signup");
        }

        var newUser = new User({
            username: username,
            password: password
        });
        newUser.save(next);
    });
}, passport.authenticate("login", {
    successRedirect: "/",
    failureRedirect: "/signup",
    failureFlash: true
}));

router.get("/users/:username", function(req, res, next) {
    User.findOne({ username: req.params.username }, function(err, user) {
        if (err) {
            return next(err);
        }
        if (!user) {
            return next(404);
        }
        res.render("profile", {
            user: user
        });
    });
});

module.exports = router;

这是 views/signup.ejs 文件:

views/signup.ejs

<% include _header %>

<h1>Sign up</h1>

<form action="/signup" method="post">
    <input name="username" type="text" class="form-control"     placeholder="Username" required autofocus>
    <input name="password" type="password" class="form-control" placeholder="Password" required>
    <input type="submit" value="Sign up" class="btn btn-primary btn-block">
</form>

<% include _footer %>

当点击views/signup.ejs 文件的提交按钮时，'User' 记录确实被提交到 MongoDB 数据库，但是插入后在“/注册”发布方法:

localhost:3000/signup (POST)

Error: Unknown authentication strategy "login"
    at attempt     (/<APP_PATH>/node_modules/passport/lib/middleware/authenticate.js:166:37)
   at authenticate (/<APP_PATH>/node_modules/passport/lib/middleware/authenticate.js:342:7)
   at Layer.handle [as handle_request] (/<APP_PATH>/node_modules/express/lib/router/layer.js:95:5)
   at next (/<APP_PATH>/node_modules/express/lib/router/route.js:131:13)
   at model.<anonymous> (/<APP_PATH>/node_modules/mongoose/lib/document.js:1731:20)
   at next_ (/<APP_PATH>/node_modules/hooks-fixed/hooks.js:89:34)
   at fnWrapper (/<APP_PATH>/node_modules/hooks-fixed/hooks.js:186:18)
   at /<APP_PATH>/node_modules/mongoose/lib/model.js:295:13
   at /<APP_PATH>/node_modules/mongoose/lib/model.js:230:5
   at /<APP_PATH>/node_modules/mongoose/lib/model.js:139:7
   at /<APP_PATH>/node_modules/mongoose/node_modules/mongodb/lib/collection.js:479:5
   at /<APP_PATH>/node_modules/mongoose/node_modules/mongodb/lib/collection.js:633:5
   at /<APP_PATH>/node_modules/mongoose/node_modules/mongodb/lib/bulk/unordered.js:469:9
   at resultHandler (/<APP_PATH>/node_modules/mongoose/node_modules/mongodb/lib/bulk/unordered.js:416:5)
   at /<APP_PATH>/node_modules/mongoose/node_modules/mongodb-core/lib/topologies/server.js:778:13
   at Callbacks.emit (/<APP_PATH>/node_modules/mongoose/node_modules/mongodb-core/lib/topologies/server.js:95:3)

我确实注意到 routes.js 中的 passport.authenticate 函数没有引用 "login" 事件文件。

有人收到类似的“错误:未知身份验证策略“登录””错误吗？

最佳答案

我会选择删除这个问题，但因为我真诚地熬夜解决这个问题，我至少应该发布错误是什么。

在构建此应用程序时，创建了以下 View :

• index.ejs
• signup.ejs

如果您查看上面的 routes.js 文件，当有人发布注册表单时 (router.post("/signup"..)， passport.authenticate 将发送用户自动注册“登录” View 并将用户发送到根端点。

调用的“登录”状态不存在导致错误，因此出现以下消息:

“错误:未知身份验证策略“登录””错误

谢谢大家的帮助。

关于javascript - express 和 Passport 错误 : Unknown authentication strategy "login"，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/40147267/