Created
August 24, 2021 14:01
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| const html404 = `<!DOCTYPE html> | |
| <body> | |
| <h1>404 Not Found.</h1> | |
| <p>The url you visit is not found.</p> | |
| </body>`; | |
| const KEY = "ccccccvbddhvfhcldgvvjlcefnbihdngnfjhdbjekuic" | |
| async function randomString(len) { | |
| len = len || 32; | |
| 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 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 handleRequest(request) { | |
| console.log(request) | |
| if (request.method === "POST") { | |
| let req=await request.json() | |
| console.log(req["url"]) | |
| if(req["key"] !== KEY || !await checkURL(req["url"])){ | |
| return new Response(`{"status":400,"key":": Error: Input illegal."}`, { | |
| headers: { | |
| "content-type": "text/json;charset=UTF-8", | |
| "Access-Control-Allow-Methods": "POST", | |
| }, | |
| status: 400 | |
| })} | |
| let stat,random_key=await save_url(req["url"]) | |
| console.log(stat) | |
| if (typeof(stat) == "undefined"){ | |
| return new Response(`{"status":200,"key":"`+random_key+`"}`, { | |
| headers: { | |
| "content-type": "text/html;charset=UTF-8", | |
| "Access-Control-Allow-Origin":"*", | |
| "Access-Control-Allow-Methods": "POST", | |
| }, | |
| }) | |
| }else{ | |
| return new Response(`{"status":200,"key":": Error:Reach the KV write limitation."}`, { | |
| headers: { | |
| "content-type": "text/html;charset=UTF-8", | |
| "Access-Control-Allow-Origin":"*", | |
| "Access-Control-Allow-Methods": "POST", | |
| }, | |
| })} | |
| }else if(request.method === "OPTIONS"){ | |
| return new Response(``, { | |
| headers: { | |
| "content-type": "text/html;charset=UTF-8", | |
| "Access-Control-Allow-Origin":"*", | |
| "Access-Control-Allow-Methods": "POST", | |
| }, | |
| }) | |
| } | |
| const requestURL = new URL(request.url) | |
| const path = requestURL.pathname.split("/")[1] | |
| console.log(path) | |
| if(!path){ | |
| return new Response(html404, { | |
| headers: { | |
| "content-type": "text/html;charset=UTF-8", | |
| }, | |
| status: 404 | |
| }) | |
| } | |
| const value = await LINKS.get(path) | |
| console.log(value) | |
| // Construct the cache key from the cache URL | |
| const cacheUrl = new URL(request.url) | |
| const cacheKey = new Request(cacheUrl.toString(), request) | |
| const cache = caches.default | |
| // Check whether the value is already available in the cache | |
| // if not, you will need to fetch it from origin, and store it in the cache | |
| // for future access | |
| let response = await cache.match(cacheKey) | |
| if (response) { | |
| // return response; | |
| } | |
| const location = value | |
| if (location) { | |
| let req = new Request(location, request); | |
| let response = await fetch(req, { | |
| headers: { | |
| 'Referer': location.hostname, | |
| } | |
| }) | |
| response = new Response(response.body, response) | |
| // Cache API respects Cache-Control headers. Setting s-max-age to 10 | |
| // will limit the response to be in cache for 10 seconds max | |
| // Any changes made to the response here will be reflected in the cached value | |
| response.headers.append("Cache-Control", "s-maxage=360000") | |
| response.headers.append("x-origin", value) | |
| // Store the fetched response as cacheKey | |
| // Use waitUntil so you can return the response without blocking on | |
| // writing to cache | |
| await cache.put(cacheKey, response.clone()) | |
| return response; | |
| } | |
| return new Response(html404, { | |
| headers: { | |
| "content-type": "text/html;charset=UTF-8", | |
| }, | |
| status: 404 | |
| }) | |
| } | |
| addEventListener("fetch", async event => { | |
| event.respondWith(handleRequest(event.request)) | |
| }) |
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| function jugeUrl(URL) { | |
| var str = URL; | |
| //判断URL地址的正则表达式为:http(s)?://([\w-]+\.)+[\w-]+(/[\w- ./?%&=]*)? | |
| //下面的代码中应用了转义字符""输出一个字符"/" | |
| var Expression = /http(s)?:\/\/([\w-]+\.)+[\w-]+(\/[\w- .\/?%&=]*)?/; | |
| var objExp = new RegExp(Expression); | |
| if (objExp.test(str) == true) { | |
| return true; | |
| } else { | |
| return false; | |
| } | |
| } | |
| function isBase64(str) { | |
| if (str ==='' || str.trim() ===''){ return false; } | |
| try { | |
| return btoa(atob(str)) == str; | |
| } catch (err) { | |
| return false; | |
| } | |
| } | |
| addEventListener("fetch", event => { | |
| let url = new URL(event.request.url); | |
| if(isBase64(url.pathname.substr(1))){ | |
| img_url = atob(url.pathname.substr(1)) | |
| url.href = img_url; | |
| }else{ | |
| return false; | |
| } | |
| if(!jugeUrl(img_url)){ | |
| return false; | |
| } | |
| let request = new Request(url, event.request); | |
| event.respondWith( | |
| fetch(request, { | |
| headers: { | |
| 'Referer': url.hostname, | |
| } | |
| }) | |
| ); | |
| }); |
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