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https://github.com/windate3411/ac_core_final_q4
https://github.com/windate3411/ac_core_final_q4
Last synced: about 1 month ago
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- Host: GitHub
- URL: https://github.com/windate3411/ac_core_final_q4
- Owner: windate3411
- Created: 2019-08-14T08:53:40.000Z (over 5 years ago)
- Default Branch: master
- Last Pushed: 2023-01-07T08:42:31.000Z (almost 2 years ago)
- Last Synced: 2024-04-15T07:41:44.421Z (7 months ago)
- Language: JavaScript
- Size: 2.56 MB
- Stars: 0
- Watchers: 2
- Forks: 0
- Open Issues: 9
-
Metadata Files:
- Readme: Readme.md
Awesome Lists containing this project
README
# 短網址產生器 Url shortener
這是一個簡單的短網址產生器，當使用者輸入網址時會產生對應的短網址
此短網址在伺服器啟動時皆有效
## 專案預覽 Project preview
## 專案需求 Prerequisites
為了確保程式順利運作，你需要安裝以下程式 You need to install following software
+ [Node.js v10.16.0(LTS)](https://nodejs.org/en/)
+ [MongoDB v4.0.10](https://www.mongodb.com/)
## 如何開始 Getting Started
```
# 下載專案 Clone the repository:
git clone https://github.com/windate3411/AC_core_final_Q4.git
# 安裝NPM套件 Install NPM dependencies
npm install
# 執行程式 Start the app
npm run dev
順利執行時會在終端機看到
you are now listening at port 3000
mongodb connect
便可前往http://localhost:3000使用
```
## 給助教的話
為了節省助教的時間，將題目特別要求的程式碼獨立展示
+ 產生短id的程式碼
```
function ranNumbers(min, max) {
let result = Math.floor(Math.random() * (max - min + 1)) + min
return result
}
function genShortId(n) {
const letters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'
let shortId = ''
for (let i = 0; i < n; i++) {
let index = ranNumbers(0, letters.length - 1)
shortId += letters[index]
}
return shortId
}
```
+ 避免短ID重複的程式碼
```
// create url code
const urlCode = genShortId(5)
// check urlCode 這寫法極端的粗糙，但目前只做到這樣防止重複
try {
let url = await Url.findOne({ urlCode });
if (url) {
res.status(404).send('sorry urlCode seems to repeated,plz try again')
}
} catch (error) {
console.log(error);
res.status(500).json('server error')
}
```
+ 檢查輸入的是否為正確網址(已加入前端驗證，此為後端驗證的部分)
```
// check longUrl
if (validUrl.isUri(longUrl)) {
try {
let url = await Url.findOne({ longUrl });
if (url) {
res.render('index', { shortenUrl: url.shortUrl, urlCode: url.urlCode, url })
} else {
let shortUrl;
if (process.env.HEROKU) {
shortUrl = herokuUrl + '/' + urlCode;
} else {
shortUrl = baseUrl + '/' + urlCode;
}
url = new Url({
longUrl,
shortUrl,
urlCode,
date: new Date()
});
await url.save();
res.render('index', { shortenUrl: url.shortUrl, urlCode: url.urlCode, url })
}
} catch (error) {
console.log(error);
res.status(500).json('server error')
}
} else {
res.status(401).json('Invalid long url')
}
```
+ 在heroku或是本地伺服器執行時會產生不同的短網址
```
let shortUrl;
if (process.env.HEROKU) {
shortUrl = herokuUrl + '/' + urlCode;
} else {
shortUrl = baseUrl + '/' + urlCode;
}
```
## 作者 Author
* **Danny Wang**