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worker.js
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worker.js
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const config = {
result_page: false, // After get the value from KV, if use a page to show the result.
theme: "", // Homepage theme, use the empty value for default theme. To use urlcool theme, please fill with "theme/urlcool" .
cors: true, // Allow Cross-origin resource sharing for API requests.
unique_link: true, // If it is true, the same long url will be shorten into the same short url
custom_link: true, // Allow users to customize the short url.
overwrite_kv: false, // Allow user to overwrite an existed key.
snapchat_mode: false, // The link will be distroyed after access.
visit_count: false, // Count visit times.
load_kv: false, // Load all from Cloudflare KV
system_type: "shorturl", // shorturl, imghost, other types {pastebin, journal}
}
// key in protect_keylist can't read, add, del from UI and API
const protect_keylist = [
"password",
]
let index_html = "https://crazypeace.github.io/Url-Shorten-Worker/" + config.theme + "/index.html"
let result_html = "https://crazypeace.github.io/Url-Shorten-Worker/" + config.theme + "/result.html"
const html404 = `<!DOCTYPE html>
<html>
<body>
<h1>404 Not Found.</h1>
<p>The url you visit is not found.</p>
<p> <a href="https://github.com/crazypeace/Url-Shorten-Worker/" target="_self">Fork me on GitHub</a> </p>
</body>
</html>`
let response_header = {
"Content-type": "text/html;charset=UTF-8;application/json",
}
if (config.cors) {
response_header = {
"Content-type": "text/html;charset=UTF-8;application/json",
"Access-Control-Allow-Origin": "*",
"Access-Control-Allow-Methods": "POST",
"Access-Control-Allow-Headers": "Content-Type",
}
}
function base64ToBlob(base64String) {
var parts = base64String.split(';base64,');
var contentType = parts[0].split(':')[1];
var raw = atob(parts[1]);
var rawLength = raw.length;
var uInt8Array = new Uint8Array(rawLength);
for (var i = 0; i < rawLength; ++i) {
uInt8Array[i] = raw.charCodeAt(i);
}
return new Blob([uInt8Array], { type: contentType });
}
async function randomString(len) {
len = len || 6;
let chars = 'ABCDEFGHJKMNPQRSTWXYZabcdefhijkmnprstwxyz2345678'; /*去掉了容易混淆的字符oOLl,9gq,Vv,Uu,I1 *** Easily confused characters removed */
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)
// 查KV中的password对应的值 Query "password" in KV
const password_value = await LINKS.get("password");
/************************/
// 以下是API接口的处理 Below is operation for API
if (request.method === "POST") {
let req = await request.json()
// console.log(req)
let req_cmd = req["cmd"]
let req_url = req["url"]
let req_key = req["key"]
let req_password = req["password"]
/*
console.log(req_cmd)
console.log(req_url)
console.log(req_key)
console.log(req_password)
*/
if (req_password != password_value) {
return new Response(`{"status":500,"key": "", "error":"Error: Invalid password."}`, {
headers: response_header,
})
}
if (req_cmd == "add") {
if ((config.system_type == "shorturl") && !await checkURL(req_url)) {
return new Response(`{"status":500, "url": "` + req_url + `", "error":"Error: Url illegal."}`, {
headers: response_header,
})
}
let stat, random_key
if (config.custom_link && (req_key != "")) {
// Refuse 'password" as Custom shortURL
if (protect_keylist.includes(req_key)) {
return new Response(`{"status":500,"key": "` + req_key + `", "error":"Error: Key in protect_keylist."}`, {
headers: response_header,
})
}
let is_exist = await is_url_exist(req_key)
if ((!config.overwrite_kv) && (is_exist)) {
return new Response(`{"status":500,"key": "` + req_key + `", "error":"Error: Specific key existed."}`, {
headers: response_header,
})
} else {
random_key = req_key
stat, await LINKS.put(req_key, req_url)
}
} else 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") {
await LINKS.put(url_sha512, random_key)
// console.log()
}
}
} else {
stat, random_key = await save_url(req_url)
}
// console.log(stat)
if (typeof (stat) == "undefined") {
return new Response(`{"status":200, "key":"` + random_key + `", "error": ""}`, {
headers: response_header,
})
} else {
return new Response(`{"status":500, "key": "", "error":"Error: Reach the KV write limitation."}`, {
headers: response_header,
})
}
} else if (req_cmd == "del") {
// Refuse to delete 'password' entry
if (protect_keylist.includes(req_key)) {
return new Response(`{"status":500, "key": "` + req_key + `", "error":"Error: Key in protect_keylist."}`, {
headers: response_header,
})
}
await LINKS.delete(req_key)
// 计数功能打开的话, 要把计数的那条KV也删掉 Remove the visit times record
if (config.visit_count) {
await LINKS.delete(req_key + "-count")
}
return new Response(`{"status":200, "key": "` + req_key + `", "error": ""}`, {
headers: response_header,
})
} else if (req_cmd == "qry") {
// Refuse to query 'password'
if (protect_keylist.includes(req_key)) {
return new Response(`{"status":500,"key": "` + req_key + `", "error":"Error: Key in protect_keylist."}`, {
headers: response_header,
})
}
let value = await LINKS.get(req_key)
if (value != null) {
let jsonObjectRetrun = JSON.parse(`{"status":200, "error":"", "key":"", "url":""}`);
jsonObjectRetrun.key = req_key;
jsonObjectRetrun.url = value;
return new Response(JSON.stringify(jsonObjectRetrun), {
headers: response_header,
})
} else {
return new Response(`{"status":500, "key": "` + req_key + `", "error":"Error: Key not exist."}`, {
headers: response_header,
})
}
} else if (req_cmd == "qryall") {
if ( !config.load_kv) {
return new Response(`{"status":500, "error":"Error: Config.load_kv false."}`, {
headers: response_header,
})
}
let keyList = await LINKS.list()
if (keyList != null) {
// 初始化返回数据结构 Init the return struct
let jsonObjectRetrun = JSON.parse(`{"status":200, "error":"", "kvlist": []}`);
for (var i = 0; i < keyList.keys.length; i++) {
let item = keyList.keys[i];
// Hide 'password' from the query all result
if (protect_keylist.includes(item.name)) {
continue;
}
// Hide '-count' from the query all result
if (item.name.endsWith("-count")) {
continue;
}
let url = await LINKS.get(item.name);
let newElement = { "key": item.name, "value": url };
// 填充要返回的列表 Fill the return list
jsonObjectRetrun.kvlist.push(newElement);
}
return new Response(JSON.stringify(jsonObjectRetrun) , {
headers: response_header,
})
} else {
return new Response(`{"status":500, "error":"Error: Load keyList failed."}`, {
headers: response_header,
})
}
}
} else if (request.method === "OPTIONS") {
return new Response(``, {
headers: response_header,
})
}
/************************/
// 以下是浏览器直接访问worker页面的处理 Below is operation for browser visit worker page
const requestURL = new URL(request.url)
let path = requestURL.pathname.split("/")[1]
path = decodeURIComponent(path);
const params = requestURL.search;
// console.log(path)
// 如果path为空, 即直接访问本worker
// If visit this worker directly (no path)
if (!path) {
return Response.redirect("https://zelikk.blogspot.com/search/label/Url-Shorten-Worker", 302)
/* new Response(html404, {
headers: response_header,
status: 404
}) */
}
// 如果path符合password 显示操作页面index.html
// if path equals password, return index.html
if (path == password_value) {
let index = await fetch(index_html)
index = await index.text()
index = index.replace(/__PASSWORD__/gm, password_value)
// 操作页面文字修改
// index = index.replace(/短链系统变身/gm, "")
return new Response(index, {
headers: response_header,
})
}
// 在KV中查询 短链接 对应的原链接
// Query the value(long url) in KV by key(short url)
let value = await LINKS.get(path);
// console.log(value)
// 如果path是'password', 让查询结果为空, 不然直接就把password查出来了
// Protect password. If path equals 'password', set result null
if (protect_keylist.includes(path)) {
value = ""
}
if (!value) {
// KV中没有数据, 返回404
// If request not in KV, return 404
return new Response(html404, {
headers: response_header,
status: 404
})
}
// 计数功能
if (config.visit_count) {
// 获取并增加访问计数
let count = await LINKS.get(path + "-count");
if (count === null) {
await LINKS.put(path + "-count", "1"); // 初始化为1，因为这是首次访问
} else {
count = parseInt(count) + 1;
await LINKS.put(path + "-count", count.toString());
}
}
// 如果阅后即焚模式
if (config.snapchat_mode) {
// 删除KV中的记录
// Remove record before jump to long url
await LINKS.delete(path)
}
// 带上参数部分, 拼装要跳转的最终网址
// URL to jump finally
if (params) {
value = value + params
}
// 如果自定义了结果页面
if (config.result_page) {
let result_page_html = await fetch(result_html)
let result_page_html_text = await result_page_html.text()
result_page_html_text = result_page_html_text.replace(/{__FINAL_LINK__}/gm, value)
return new Response(result_page_html_text, {
headers: response_header,
})
}
// 以下是不使用自定义结果页面的处理
// 作为一个短链系统, 需要跳转
if (config.system_type == "shorturl") {
return Response.redirect(value, 302)
} else if (config.system_type == "imghost") {
// 如果是图床
var blob = base64ToBlob(value)
return new Response(blob, {
// 图片不能指定content-type为 text/plain
})
} else {
// 如果只是一个单纯的key-value系统, 简单的显示value就行了
return new Response(value, {
headers: response_header,
})
}
}
addEventListener("fetch", async event => {
event.respondWith(handleRequest(event.request))
})