index.min.js

require("dotenv").config();const express=require("express"),cors=require("cors"),axios=require("axios"),{createHash:createHash}=require("crypto"),rateLimit=require("express-rate-limit"),{parse:parseUrl,URL:URL}=require("url"),{parse:parseHtml}=require("node-html-parser"),allowedDomains=process.env.ALLOWED_DOMAINS.split(","),app=express();app.use(cors());const port=process.env.PORT||3e3,host=process.env.HOST||"0.0.0.0";function addProtocolToUrl(url){return url.startsWith("http://")||url.startsWith("https://")||(url="https://"+url),url}function parseUrlWithoutHashAndQuery(fullUrl){fullUrl=addProtocolToUrl(fullUrl);const parsedUrl=new URL(fullUrl);parsedUrl.hash="",parsedUrl.search="";return parsedUrl.toString()}async function hashContent(content){const hash=createHash("sha256");return hash.update(content),hash.digest("hex")}async function fetchAndHashContent(url,visitedUrls=new Set){if(visitedUrls.has(url))return"";visitedUrls.add(url);const content=(await axios.get(url,{responseType:"arraybuffer"})).data.toString("utf-8"),linkedResources=parseHtml(content).querySelectorAll('link[rel="stylesheet"], script[src]');return`${content}_${(await Promise.all(linkedResources.map((async resource=>{const resourceUrl=parseUrl(resource.getAttribute("href")||resource.getAttribute("src"),!0);let absoluteResourceUrl=resourceUrl.href;resourceUrl.hostname||(resourceUrl.path.startsWith("/")||url.endsWith("/")||(url+="/"),absoluteResourceUrl=`${url}${resourceUrl.path}`);const resourceContent=await fetchAndHashContent(absoluteResourceUrl,visitedUrls);return`${resourceUrl.path}_${resourceContent}`})))).join("_")}`}app.use(express.json()),app.use(rateLimit({windowMs:6e4,max:20})),app.get("/",((req,res)=>{res.send("Hello There!")}));const hashCache=new Map;async function fetchAndSaveAppHash(url,lastUpdated=Date.now()){const hashedContent=await fetchAndHashContent(url),hash=await hashContent(Buffer.from(hashedContent,"utf-8"));hashCache.set(url,{hash:hash,lastUpdated:lastUpdated})}app.post("/hash",(async(req,res)=>{try{let{urls:urls}=req.body;if(!urls)return res.status(400).json({error:"Missing <urls> in the request parameters"});Array.isArray(urls)||(urls=[urls]);const promises=urls.map((async url=>{const urlWithoutHashAndQuery=parseUrlWithoutHashAndQuery(url);let hash;const githubRepoRegex=/https?:\/\/([\w-]+)\.github\.io\/([\w-]+)/;if(githubRepoRegex.test(urlWithoutHashAndQuery)&&"ranchimall"===urlWithoutHashAndQuery.match(githubRepoRegex)[1])hashCache.has(urlWithoutHashAndQuery)||await fetchAndSaveAppHash(urlWithoutHashAndQuery),hash=hashCache.get(urlWithoutHashAndQuery).hash;else{const hashedContent=await fetchAndHashContent(urlWithoutHashAndQuery);hash=await hashContent(Buffer.from(hashedContent,"utf-8"))}return{url:url,hash:hash}})),results=await Promise.all(promises);res.json(results)}catch(error){res.status(500).json({error:error.message})}})),app.post("/gitwh",(async(req,res)=>{try{if(!req.headers["user-agent"].startsWith("GitHub-Hookshot/"))return;const{repository:{pushed_at:pushed_at,organization:organization,name:name,has_pages:has_pages}}=req.body;if(!has_pages)return;const url=`https://${organization}.github.io/${name}`;await fetchAndSaveAppHash(url,pushed_at),res.json({message:"success"})}catch(err){res.status(500).json({error:err.message})}})),app.listen(port,host,(()=>{console.log(`Server is running at http://${host}:${port}`)})),module.exports=app;