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template.js
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const config = {
no_ref: 'off', //Control the HTTP referrer header, if you want to create an anonymous link that will hide the HTTP Referer header, please set to "on" .
theme: '', //Homepage theme, use the empty value for default theme. To use urlcool theme, please fill with "theme/urlcool" .
cors: 'on', //Allow Cross-origin resource sharing for API requests.
unique_link: false, //If it is true, the same long url will be shorten into the same short url
custom_link: false //Allow users to customize the short url.
}
const html404 = `<!DOCTYPE html>
<body>
<h1>404 Not Found.</h1>
<p>The url you visit is not found.</p>
<a href="https://github.com/xyTom/Url-Shorten-Worker/" target="_self">Fork me on GitHub</a>
</body>`
let response_header = {
'content-type': 'text/html;charset=UTF-8'
}
if (config.cors == 'on') {
response_header = {
'content-type': 'text/html;charset=UTF-8',
'Access-Control-Allow-Origin': '*',
'Access-Control-Allow-Methods': 'POST'
}
}
async function randomString(len) {
len = len || 6
let $chars =
'ABCDEFGHJKMNPQRSTWXYZabcdefhijkmnprstwxyz2345678' /****默认去掉了容易混淆的字符oOLl,9gq,Vv,Uu,I1****/
let maxPos = $chars.length
let result = ''
for (i = 0; i < len; i++) {
result += $chars.charAt(Math.floor(Math.random() * maxPos))
}
return result
}
async function sha512(url) {
url = new TextEncoder().encode(url)
const url_digest = await crypto.subtle.digest(
{
name: 'SHA-512'
},
url // The data you want to hash as an ArrayBuffer
)
const hashArray = Array.from(new Uint8Array(url_digest)) // convert buffer to byte array
const hashHex = hashArray.map((b) => b.toString(16).padStart(2, '0')).join('')
//console.log(hashHex)
return hashHex
}
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 save_url(URL) {
let random_key = await randomString()
let is_exist = await LINKS.get(random_key)
console.log(is_exist)
if (is_exist == null) return await LINKS.put(random_key, URL), random_key
else save_url(URL)
}
async function is_url_exist(url_sha512) {
let is_exist = await LINKS.get(url_sha512)
console.log(is_exist)
if (is_exist == null) {
return false
} else {
return is_exist
}
}
async function handleRequest(request) {
console.log(request)
if (request.method === 'POST') {
let req = await request.json()
console.log(req['url'])
if (!(await checkURL(req['url']))) {
return new Response(`{"status":500,"key":": Error: Url illegal."}`, {
headers: response_header
})
}
let stat, random_key
if (config.unique_link) {
let url_sha512 = await sha512(req['url'])
let url_key = await is_url_exist(url_sha512)
if (url_key) {
random_key = url_key
} else {
stat, (random_key = await save_url(req['url']))
if (typeof stat == 'undefined') {
console.log(await LINKS.put(url_sha512, random_key))
}
}
} else {
stat, (random_key = await save_url(req['url']))
}
console.log(stat)
if (typeof stat == 'undefined') {
return new Response(`{"status":200,"key":"/` + random_key + `"}`, {
headers: response_header
})
} else {
return new Response(
`{"status":200,"key":": Error:Reach the KV write limitation."}`,
{
headers: response_header
}
)
}
} else if (request.method === 'OPTIONS') {
return new Response(``, {
headers: response_header
})
}
const requestURL = new URL(request.url)
const path = requestURL.pathname.split('/')[1]
const params = requestURL.search
console.log(path)
if (!path) {
const html = await fetch(
'https://xytom.github.io/Url-Shorten-Worker/' +
config.theme +
'/index.html'
)
return new Response(await html.text(), {
headers: {
'content-type': 'text/html;charset=UTF-8'
}
})
}
const value = await LINKS.get(path)
let location
if (params) {
location = value + params
} else {
location = value
}
console.log(value)
if (location) {
if (config.no_ref == 'on') {
let no_ref = await fetch(
'https://xytom.github.io/Url-Shorten-Worker/no-ref.html'
)
no_ref = await no_ref.text()
no_ref = no_ref.replace(/{Replace}/gm, location)
return new Response(no_ref, {
headers: {
'content-type': 'text/html;charset=UTF-8'
}
})
} else {
return Response.redirect(location, 302)
}
}
// If request not in kv, return 404
return new Response(html404, {
headers: {
'content-type': 'text/html;charset=UTF-8'
},
status: 404
})
}
addEventListener('fetch', async (event) => {
event.respondWith(handleRequest(event.request))
})