用 Cloudflare Workers 搭建一个短链接生成平台

本文最后更新于 263 天前，其中的信息可能已经有所发展或是发生改变。

在一些时候，我们会需要到短链接
在什么时候用上？
链接比较长时，可以缩短链接保证简洁

图片直接选取的
https://blog.mcneko.com/archives/54
图片，所以会出现不一致的情况

准备材料

1.Cloudflare 账号

2.足够短的域名

搭建过程

打开这个仓库：https://github.com/xyTom/Url-Shorten-Worker

或复制下列代码

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:true,//If it is true, the same long url will be shorten into the same short urlcustom_link:false,//Allow users to customize the short url.safe_browsing_api_key: "" //Enter Google Safe Browsing API Key to enable url safety check before redirect.}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 is_url_safe(url){  let raw = JSON.stringify({"client":{"clientId":"Url-Shorten-Worker","clientVersion":"1.0.7"},"threatInfo":{"threatTypes":["MALWARE","SOCIAL_ENGINEERING","POTENTIALLY_HARMFUL_APPLICATION","UNWANTED_SOFTWARE"],"platformTypes":["ANY_PLATFORM"],"threatEntryTypes":["URL"],"threatEntries":[{"url":url}]}});  let requestOptions = {    method: 'POST',    body: raw,    redirect: 'follow'  };  result = await fetch("https://safebrowsing.googleapis.com/v4/threatMatches:find?key="+config.safe_browsing_api_key, requestOptions)  result = await result.json()  console.log(result)  if (Object.keys(result).length === 0){    return true  }else{    return false  }}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.safe_browsing_api_key){      if(!(await is_url_safe(location))){        let warning_page = await fetch("https://xytom.github.io/Url-Shorten-Worker/safe-browsing.html")        warning_page =await warning_page.text()        warning_page = warning_page.replace(/{Replace}/gm, location)        return new Response(warning_page, {          headers: {            "content-type": "text/html;charset=UTF-8",          },        })      }    }    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))
})

打开控制台：https://dash.cloudflare.com