1 line
3.2 KiB
JavaScript
1 line
3.2 KiB
JavaScript
const express=require("express"),router=express.Router(),axios=require("axios"),{createHash:createHash}=require("crypto"),{parse:parseUrl,URL:URL}=require("url"),{parse:parseHtml}=require("node-html-parser");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("_")}`}const hashCache=new Map;async function generateHash(urls=[]){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}}));return await Promise.all(promises)}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})}router.get("/",(async(req,res)=>{const{url:url}=req.query;if(!url)return res.status(400).json({error:"Missing <url> in the query parameters"});res.json(await generateHash(url))})),router.post("/",(async(req,res)=>{try{const{urls:urls}=req.body;if(!urls)return res.status(400).json({error:"Missing <urls> in the request parameters"});res.json(await generateHash(urls))}catch(error){res.status(500).json({error:error.message})}})),router.post("/gitwh",(async(req,res)=>{try{if(!req.headers["user-agent"].startsWith("GitHub-Hookshot/"))return res.json({message:"ignored"});const{repository:{pushed_at:pushed_at,organization:organization,name:name,has_pages:has_pages}}=req.body;if(!has_pages)return res.json({message:"ignored"});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})}})),module.exports=router; |