diff --git a/sources/tech/20180716 Building a Messenger App- Access Page.md b/sources/tech/20180716 Building a Messenger App- Access Page.md index 22c53dde6d..1e195a4b55 100644 --- a/sources/tech/20180716 Building a Messenger App- Access Page.md +++ b/sources/tech/20180716 Building a Messenger App- Access Page.md @@ -7,25 +7,23 @@ [#]: via: (https://nicolasparada.netlify.com/posts/go-messenger-access-page/) [#]: author: (Nicolás Parada https://nicolasparada.netlify.com/) -Building a Messenger App: Access Page +构建一个即时消息应用(七):Access 页面 ====== -This post is the 7th on a series: +本文是该系列的第七篇。 - * [Part 1: Schema][1] - * [Part 2: OAuth][2] - * [Part 3: Conversations][3] - * [Part 4: Messages][4] - * [Part 5: Realtime Messages][5] - * [Part 6: Development Login][6] + * [第一篇: 模式][1] + * [第二篇: OAuth][2] + * [第三篇: 对话][3] + * [第四篇: 消息][4] + * [第五篇: 实时消息][5] + * [第六篇: 仅用于开发的登录][6] +现在我们已经完成了后端,让我们转到前端。 我将采用单页应用程序方案。 +首先,我们创建一个 `static/index.html` 文件,内容如下。 -Now that we’re done with the backend, lets move to the frontend. I will go with a single-page application. - -Lets start by creating a file `static/index.html` with the following content. - -``` +```html @@ -40,11 +38,11 @@ Lets start by creating a file `static/index.html` with the following content. ``` -This HTML file must be server for every URL and JavaScript will take care of rendering the correct page. +这个 HTML 文件必须为每个 URL 提供服务,并且将使用 JavaScript 负责呈现正确的页面。 -So lets go the the `main.go` for a moment and in the `main()` function add the following route: +因此,让我们将注意力转到 `main.go` 片刻,然后在 `main()` 函数中添加以下路由: -``` +```go router.Handle("GET", "/...", http.FileServer(SPAFileSystem{http.Dir("static")})) type SPAFileSystem struct { @@ -60,15 +58,15 @@ func (spa SPAFileSystem) Open(name string) (http.File, error) { } ``` -We use a custom file system so instead of returning `404 Not Found` for unknown URLs, it serves the `index.html`. +我们使用一个自定义的文件系统,因此它不是为未知的 URL 返回 `404 Not Found`,而是转到 `index.html`。 -### Router +### 路由器 -In the `index.html` we loaded two files: `styles.css` and `main.js`. I leave styling to your taste. +在 `index.html` 中我们加载了两个文件:`styles.css` 和 `main.js`。我把样式留给你自由发挥。 -Lets move to `main.js`. Create a `static/main.js` file with the following content: +让我们移动到 `main.js`。 创建一个包含以下内容的 `static/main.js` 文件: -``` +```javascript import { guard } from './auth.js' import Router from './router.js' @@ -98,19 +96,22 @@ function view(pageName) { } ``` -If you are follower of this blog, you already know how this works. That router is the one showed [here][7]. Just download it from [@nicolasparada/router][8] and save it to `static/router.js`. +如果您是这个博客的关注者,您已经知道它是如何工作的了。 该路由器就是在 [这里][7] 显示的那个。 只需从 [@nicolasparada/router][8] 下载并保存到 `static/router.js` 即可。 We registered four routes. At the root `/` we show the home or access page whether the user is authenticated. At `/callback` we show the callback page. On `/conversations/{conversationID}` we show the conversation or access page whether the user is authenticated and for every other URL, we show a not found page. -We tell the router to render the result to the document body and dispatch a `disconnect` event to each page before leaving. +我们注册了四条路由。 在根路由 `/` 处,我们展示 home 或 access 页面,无论用户是否通过身份验证。 在 `/callback` 中,我们展示 callback 页面。 在 `/conversations/{conversationID}` 上,我们展示对话或 access 页面,无论用户是否通过验证,对于其他 URL,我们展示一个 not found 页面。 -We have each page in a different file and we import them with the new dynamic `import()`. +我们告诉路由器将结果渲染为文档主体,并在离开之前向每个页面调度一个 `disconnect` 事件。 -### Auth +我们将每个页面放在不同的文件中,并使用新的动态 `import()` 函数导入它们。 -`guard()` is a function that given two functions, executes the first one if the user is authenticated, or the sencond one if not. It comes from `auth.js` so lets create a `static/auth.js` file with the following content: +### 身份验证 -``` +`guard()` 是一个函数,给它两个函数作为参数,如果用户通过了身份验证,则执行第一个函数,否则执行第二个。 +它来自 `auth.js`,所以我们创建一个包含以下内容的 `static/auth.js` 文件: + +```javascript export function isAuthenticated() { const token = localStorage.getItem('token') const expiresAtItem = localStorage.getItem('expires_at') @@ -150,17 +151,17 @@ export function getAuthUser() { } ``` -`isAuthenticated()` checks for `token` and `expires_at` from localStorage to tell if the user is authenticated. `getAuthUser()` gets the authenticated user from localStorage. +`isAuthenticated()` 检查 localStorage 中的 `token` 和 `expires_at`,以判断用户是否已通过身份验证。`getAuthUser()` 从 localStorage 中获取经过身份验证的用户。 -When we login, we’ll save all the data to localStorage so it will make sense. +当我们登录时,我们会将所有的数据保存到 localStorage,这样才有意义。 -### Access Page +### Access 页面 ![access page screenshot][9] -Lets start with the access page. Create a file `static/pages/access-page.js` with the following content: +让我们从 access 页面开始。 创建一个包含以下内容的文件 `static/pages/access-page.js`: -``` +```javascript const template = document.createElement('template') template.innerHTML = `

Messenger

@@ -172,15 +173,15 @@ export default function accessPage() { } ``` -Because the router intercepts all the link clicks to do its navigation, we must prevent the event propagation for this link in particular. +因为路由器会拦截所有链接点击来进行导航,所以我们必须特别阻止此链接的事件传播。 -Clicking on that link will redirect us to the backend, then to GitHub, then to the backend and then to the frontend again; to the callback page. +单击该链接会将我们重定向到后端,然后重定向到 GitHub,再重定向到后端,然后再次重定向到前端; 到 callback 页面。 -### Callback Page +### Callback 页面 -Create the file `static/pages/callback-page.js` with the following content: +创建包括以下内容的 `static/pages/callback-page.js` 文件: -``` +```javascript import http from '../http.js' import { navigate } from '../router.js' @@ -211,13 +212,13 @@ function getAuthUser(token) { } ``` -The callback page doesn’t render anything. It’s an async function that does a GET request to `/api/auth_user` using the token from the URL query string and saves all the data to localStorage. Then it redirects to `/`. +callback 页面不呈现任何内容。这是一个异步函数,它使用 URL 查询字符串中的 token 向 `/api/auth_user` 发出 GET 请求,并将所有数据保存到 localStorage。 然后重定向到 `/`。 ### HTTP -There is an HTTP module. Create a `static/http.js` file with the following content: +这里是一个 HTTP 模块。 创建一个包含以下内容的 `static/http.js` 文件: -``` +```javascript import { isAuthenticated } from './auth.js' async function handleResponse(res) { @@ -297,15 +298,15 @@ export default { } ``` -This module is a wrapper around the [fetch][10] and [EventSource][11] APIs. The most important part is that it adds the JSON web token to the requests. +这个模块是 [fetch][10] 和 [EventSource][11] API 的包装器。最重要的部分是它将 JSON web 令牌添加到请求中。 -### Home Page +### Home 页面 ![home page screenshot][12] -So, when the user login, the home page will be shown. Create a `static/pages/home-page.js` file with the following content: +因此,当用户登录时,将显示主页。 创建一个具有以下内容的 `static/pages/home-page.js` 文件: -``` +```javascript import { getAuthUser } from '../auth.js' import { avatar } from '../shared.js' @@ -334,15 +335,15 @@ function onLogoutClick() { } ``` -For this post, this is the only content we render on the home page. We show the current authenticated user and a logout button. +对于这篇文章,这是我们在主页上呈现的唯一内容。我们显示当前经过身份验证的用户和注销按钮。 -When the user clicks to logout, we clear all inside localStorage and do a reload of the page. +当用户单击注销时,我们清除 localStorage 中的所有内容并重新加载页面。 ### Avatar -That `avatar()` function is to show the user’s avatar. Because it’s used in more than one place, I moved it to a `shared.js` file. Create the file `static/shared.js` with the following content: +那个 `avatar()` 函数用于显示用户的头像。 由于已在多个地方使用,因此我将它移到 `shared.js` 文件中。 创建具有以下内容的文件 `static/shared.js`: -``` +```javascript export function avatar(user) { return user.avatarUrl === null ? `
` @@ -351,22 +352,24 @@ export function avatar(user) { ``` We use a small figure with the user’s initial in case the avatar URL is null. +如果头像网址为 null,我们将使用用户的姓名首字母作为初始头像。 +您可以使用 `attr()` 函数显示带有少量 CSS 样式的首字母。 You can show the initial with a little of CSS using the `attr()` function. -``` +```css .avatar[data-initial]::after { content: attr(data-initial); } ``` -### Development Login +### 仅开发使用的登录 ![access page with login form screenshot][13] -In the previous post we coded a login for development. Lets add a form for that in the access page. Go to `static/pages/access-page.js` and modify it a little. +在上一篇文章中,我们为编写了一个登录代码。让我们在 access 页面中为此添加一个表单。 进入 `static/ages/access-page.js`,稍微修改一下。 -``` +```javascript import http from '../http.js' const template = document.createElement('template') @@ -420,13 +423,13 @@ function login(username) { } ``` -I added a login form. When the user submits the form. It does a POST requets to `/api/login` with the username. Saves all the data to localStorage and reloads the page. +我添加了一个登录表单。当用户提交表单时。它使用用户名对 `/api/login` 进行 POST 请求。将所有数据保存到 localStorage 并重新加载页面。 -Remember to remove this form once you are done with the frontend. +记住在前端完成后删除此表单。 * * * -That’s all for this post. In the next one, we’ll continue with the home page to add a form to start conversations and display a list with the latest ones. +这就是这篇文章的全部内容。在下一篇文章中,我们将继续使用主页添加一个表单来开始对话,并显示包含最新对话的列表。 [Souce Code][14] @@ -436,7 +439,7 @@ via: https://nicolasparada.netlify.com/posts/go-messenger-access-page/ 作者:[Nicolás Parada][a] 选题:[lujun9972][b] -译者:[译者ID](https://github.com/译者ID) +译者:[译者ID](https://github.com/gxlct008) 校对:[校对者ID](https://github.com/校对者ID) 本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译,[Linux中国](https://linux.cn/) 荣誉推出