206 lines
6.1 KiB
Markdown
206 lines
6.1 KiB
Markdown
---
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id: 58966a17f9fc0f352b528e6d
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title: 註冊新用戶
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challengeType: 2
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forumTopicId: 301561
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dashedName: registration-of-new-users
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---
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# --description--
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現在我們需要爲新用戶添加註冊帳號的功能。 首先我們需要在主頁的 `res.render` 接收的變量對象中添加 `showRegistration: true`。 此時刷新頁面，你會看到頁面上已經顯示了我們在 `index.pug` 文件中定義的註冊表單。 這個表單設置了請求路徑 `/register`，並將請求方法設置成 **POST**，所以我們需要在服務器接受 **POST** 請求，且在數據庫中創建用戶對象。
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用戶註冊的邏輯：註冊新用戶 > 認證新用戶 > 重定向到 /profile。
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對於步驟一的註冊新用戶，詳細邏輯是這樣的：用 findOne 命令查詢數據庫 > 如果返回了用戶對象，則表示用戶存在，然後返回主頁；*或者*如果用戶未定義且沒有報錯，則會將包含用戶名和密碼的用戶對象通過 “insertOne” 添加到數據庫，只要沒有報錯則會繼續*下一步*：認證新用戶——我們已經在 */login* 路由的 POST 請求中寫好了這部分邏輯。
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```js
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app.route('/register')
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.post((req, res, next) => {
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myDataBase.findOne({ username: req.body.username }, function(err, user) {
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if (err) {
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next(err);
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} else if (user) {
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res.redirect('/');
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} else {
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myDataBase.insertOne({
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username: req.body.username,
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password: req.body.password
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},
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(err, doc) => {
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if (err) {
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res.redirect('/');
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} else {
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// The inserted document is held within
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// the ops property of the doc
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next(null, doc.ops[0]);
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}
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}
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)
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}
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})
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},
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passport.authenticate('local', { failureRedirect: '/' }),
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(req, res, next) => {
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res.redirect('/profile');
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}
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);
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```
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完成上述要求後，請提交你的頁面鏈接。 如果你遇到了問題，可以參考[這裏](https://gist.github.com/camperbot/b230a5b3bbc89b1fa0ce32a2aa7b083e)的答案。
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**注意：**接下來的挑戰可能會在運行 *picture-in-picture*（畫中畫）模式的瀏覽器中出現問題。 如果你使用的線上 IDE 提供在 IDE 內預覽 app 的功能，請考慮打開新的標籤頁預覽。
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# --hints--
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註冊路由和顯示主頁。
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```js
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(getUserInput) =>
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$.get(getUserInput('url') + '/_api/server.js').then(
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(data) => {
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assert.match(
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data,
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/showRegistration:( |)true/gi,
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'You should be passing the variable showRegistration as true to your render function for the homepage'
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);
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assert.match(
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data,
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/register[^]*post[^]*findOne[^]*username:( |)req.body.username/gi,
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'You should have a route accepted a post request on register that querys the db with findone and the query being username: req.body.username'
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);
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},
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(xhr) => {
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throw new Error(xhr.statusText);
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}
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);
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```
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註冊功能應可以正常運行。
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```js
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async (getUserInput) => {
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const url = getUserInput('url');
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const user = `freeCodeCampTester${Date.now()}`;
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const xhttp = new XMLHttpRequest();
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xhttp.onreadystatechange = function () {
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if (this.readyState == 4 && this.status == 200) {
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test(this);
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} else {
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throw new Error(`${this.status} ${this.statusText}`);
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}
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};
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xhttp.open('POST', url + '/register', true);
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xhttp.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
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xhttp.send(`username=${user}&password=${user}`);
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function test(xhttpRes) {
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const data = xhttpRes.responseText;
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assert.match(
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data,
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/Profile/gi,
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'Register should work, and redirect successfully to the profile.'
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);
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}
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};
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```
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登錄功能應可以正常運行。
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```js
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async (getUserInput) => {
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const url = getUserInput('url');
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const user = `freeCodeCampTester${Date.now()}`;
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const xhttpReg = new XMLHttpRequest();
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xhttpReg.onreadystatechange = function () {
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if (this.readyState == 4 && this.status == 200) {
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login();
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} else {
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throw new Error(`${this.status} ${this.statusText}`);
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}
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};
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xhttpReg.open('POST', url + '/register', true);
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xhttpReg.setRequestHeader(
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'Content-type',
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'application/x-www-form-urlencoded'
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);
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xhttpReg.send(`username=${user}&password=${user}`);
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function login() {
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const xhttp = new XMLHttpRequest();
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xhttp.onreadystatechange = function () {
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if (this.readyState == 4 && this.status == 200) {
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test(this);
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} else {
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throw new Error(`${this.status} ${this.statusText}`);
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}
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};
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xhttp.open('POST', url + '/login', true);
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xhttp.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
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xhttp.send(`username=${user}&password=${user}`);
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}
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function test(xhttpRes) {
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const data = xhttpRes.responseText;
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assert.match(
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data,
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/Profile/gi,
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'Login should work if previous test was done successfully and redirect successfully to the profile.'
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);
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assert.match(
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data,
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new RegExp(user, 'g'),
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'The profile should properly display the welcome to the user logged in'
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);
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}
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};
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```
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退出登錄功能應可以正常運行。
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```js
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(getUserInput) =>
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$.ajax({
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url: getUserInput('url') + '/logout',
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type: 'GET',
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xhrFields: { withCredentials: true }
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}).then(
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(data) => {
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assert.match(data, /Home/gi, 'Logout should redirect to home');
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},
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(xhr) => {
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throw new Error(xhr.statusText);
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}
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);
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```
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退出登錄後，profile 頁面應無法訪問。
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```js
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(getUserInput) =>
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$.ajax({
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url: getUserInput('url') + '/profile',
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type: 'GET',
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crossDomain: true,
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xhrFields: { withCredentials: true }
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}).then(
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(data) => {
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assert.match(
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data,
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/Home/gi,
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'Profile should redirect to home when we are logged out now again'
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);
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},
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(xhr) => {
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throw new Error(xhr.statusText);
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}
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);
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```
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# --solutions--
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```js
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/**
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Backend challenges don't need solutions,
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because they would need to be tested against a full working project.
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Please check our contributing guidelines to learn more.
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*/
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```
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