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@Lucifergene
Created August 28, 2021 16:20
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CloudFlare Worker Script for URL Shortener Service
addEventListener('fetch', event => {
event.respondWith(handleRequest(event.request))
})
const html404 = `<!DOCTYPE html>
<body>
<h1>404 Not Found.</h1>
<p>The url you visit is not found.</p>
</body>`
const htmlBody = `
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>URL Shortener</title>
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/css/bootstrap.min.css" rel="stylesheet"
integrity="sha384-EVSTQN3/azprG1Anm3QDgpJLIm9Nao0Yz1ztcQTwFspd3yD65VohhpuuCOmLASjC" crossorigin="anonymous">
<style>
@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;700;900&display=swap');
*,
body {
font-family: 'Poppins', sans-serif;
font-weight: 400;
-webkit-font-smoothing: antialiased;
text-rendering: optimizeLegibility;
-moz-osx-font-smoothing: grayscale;
}
html,
body {
height: 100%;
background-color: #152733;
overflow: hidden;
}
.form-holder {
display: flex;
flex-direction: column;
justify-content: center;
align-items: center;
text-align: center;
min-height: 100vh;
}
.form-holder .form-content {
position: relative;
text-align: center;
display: -webkit-box;
display: -moz-box;
display: -ms-flexbox;
display: -webkit-flex;
display: flex;
-webkit-justify-content: center;
justify-content: center;
-webkit-align-items: center;
align-items: center;
padding: 60px;
}
.form-content .form-items {
border: 3px solid #fff;
padding: 40px;
display: inline-block;
width: 100%;
min-width: 540px;
-webkit-border-radius: 10px;
-moz-border-radius: 10px;
border-radius: 10px;
text-align: left;
-webkit-transition: all 0.4s ease;
transition: all 0.4s ease;
}
.form-content h3 {
color: #fff;
text-align: left;
font-size: 28px;
font-weight: 600;
margin-bottom: 5px;
}
.form-content h3.form-title {
margin-bottom: 30px;
}
.form-content p {
color: #fff;
text-align: left;
font-size: 17px;
font-weight: 300;
line-height: 20px;
margin-bottom: 30px;
}
.form-content label,
.was-validated .form-check-input:invalid~.form-check-label,
.was-validated .form-check-input:valid~.form-check-label {
color: #fff;
}
.form-content input[type=text],
.form-content input[type=password],
.form-content input[type=email],
.form-content select {
width: 100%;
padding: 9px 20px;
text-align: left;
border: 0;
outline: 0;
border-radius: 6px;
background-color: #fff;
font-size: 15px;
font-weight: 300;
color: #8D8D8D;
-webkit-transition: all 0.3s ease;
transition: all 0.3s ease;
margin-top: 16px;
}
.btn-primary {
background-color: #6C757D;
outline: none;
border: 0px;
box-shadow: none;
}
.btn-primary:hover,
.btn-primary:focus,
.btn-primary:active {
background-color: #495056;
outline: none !important;
border: none !important;
box-shadow: none;
}
.form-content textarea {
position: static !important;
width: 100%;
padding: 8px 20px;
border-radius: 6px;
text-align: left;
background-color: #fff;
border: 0;
font-size: 15px;
font-weight: 300;
color: #8D8D8D;
outline: none;
resize: none;
height: 120px;
-webkit-transition: none;
transition: none;
margin-bottom: 14px;
}
.form-content textarea:hover,
.form-content textarea:focus {
border: 0;
background-color: #ebeff8;
color: #8D8D8D;
}
.mv-up {
margin-top: -9px !important;
margin-bottom: 8px !important;
}
.invalid-feedback {
color: #ff606e;
}
.valid-feedback {
color: #2acc80;
}
</style>
<script>
const submitURL = () => {
document.getElementById("status").innerHTML = "Creating short url"
//await call url for new shortlink and return
long = document.getElementById("url").value;
short = document.getElementById("shortid").value;
const object = {
longURL: long,
shortURL: short
}
fetch('/', {
method: "POST",
body: JSON.stringify(object),
headers: {
'Content-Type': 'application/json'
}
})
.then(data => data.text())
.then(data => {
console.log('ready')
document.getElementById("status").innerHTML = data
})
}
</script>
</head>
<body>
<div class="form-body">
<div class="row">
<div class="form-holder">
<div class="form-content">
<div class="form-items">
<h3 class="text-center mx-auto">The URL Shortener</h3>
<p class="text-center mx-auto">Shorten Big URLs</p>
<div class="col-md-12">
<input class="form-control" type="text" id="url" placeholder="Enter the URL" required>
</div>
<div class="col-md-12">
<input class="form-control" type="text" id="shortid"
placeholder="Provide an Alias (Optional)">
</div>
<div class="form-button mt-4 text-center mx-auto ">
<button id="submit" onclick="submitURL()" class="btn btn-primary">Shorten</button>
</div>
<div class=" col-md-12 mt-5 text-center mx-auto">
<label class="form-check-label" id="status"></label>
</div>
</div>
</div>
</div>
</div>
</div>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/js/bootstrap.bundle.min.js"
integrity="sha384-MrcW6ZMFYlzcLA8Nl+NtUVF0sA7MsXsP1UyJoMp4YLEuNSfAP+JcXn/tWtIaxVXM"
crossorigin="anonymous"></script>
</body>
</html>
`
/**
* Respond with hello worker text
* @param {Request} request
*/
async function randomString(len) {
  len = len || 6;
  let $chars = 'ABCDEFGHJKMNPQRSTWXYZabcdefhijkmnprstwxyz2345678';
  let maxPos = $chars.length;
  let result = '';
  for (i = 0; i < len; i++) {
    result += $chars.charAt(Math.floor(Math.random() * maxPos));
  }
  return result;
}
async function checkURL(URL){
let str=URL;
let Expression=/http(s)?:\/\/([\w-]+\.)+[\w-]+(\/[\w- .\/?%&=]*)?/;
let objExp=new RegExp(Expression);
if(objExp.test(str)==true){
if (str[0] == 'h')
return true;
else
return false;
}else{
return false;
}
}
async function handleRequest(request) {
if (request.method === "POST") {
const urls = await request.json()
let urlb = JSON.parse(JSON.stringify(urls))
longURL = urlb.longURL
shortURL = urlb.shortURL
if ( shortURL == "" ){
shortURL = await randomString()
}
if(!await checkURL(longURL)){
return new Response(" Illegal URL Detected. Please Enter a Valid URL ")
}
let is_exist = await URL_SPACE.get(shortURL)
if (is_exist == null) {
await URL_SPACE.put(shortURL, longURL)
return new Response("Your short URL: http://localhost:8787/" + shortURL)
}
else {
return new Response(" Duplicate Alias Detected. Enter a different Alias. ")
}
}
if (request.method === "GET") {
let shortCode = request.url.replace(/https:\/\/.+?\//g, "")
shortCode = shortCode.replace(/http:\/\/.+?\//g, "")
if (shortCode !== "") {
let redirectTo = await URL_SPACE.get(shortCode)
if (redirectTo != null) {
return Response.redirect(redirectTo, 301)
}
else {
return new Response(html404, {
headers: {
"content-type": "text/html;charset=UTF-8",
},
status: 404
})
}
}
else {
return new Response(htmlBody, {
headers: { 'content-type': 'text/html' },
})
}
}
}
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