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April 26, 2021 01:18
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Stale Session Managerment #springboot
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <meta http-equiv="X-UA-Compatible" content="IE=edge"> | |
| <meta name="viewport" content="width=device-width, initial-scale=1.0"> | |
| <link rel="shortcut icon"type="image/x-icon" href="data:image/x-icon;,"> | |
| <title>Reload</title> | |
| <script> | |
| (function() { | |
| window.addEventListener("beforeunload", function (e) { | |
| let token; | |
| for(let i = 0; i < sessionStorage.length; i++) { | |
| const key = sessionStorage.key(i); | |
| if (key.startsWith('PREFIX.')) { | |
| token = sessionStorage.getItem(key); | |
| break; | |
| } | |
| } | |
| if (token) { | |
| // Add maybe | |
| const tokenParts = token.split('.'); | |
| if (tokenParts && tokenParts.length === 2) { | |
| const localStorageToken = `MAYBE_STALE_PREFIX.${tokenParts[1]}`; | |
| localStorage.setItem(localStorageToken, Date.now()); | |
| } | |
| } | |
| }); | |
| // Add new Token to session storage if not present | |
| const now = Date.now(); | |
| let token; | |
| for(let i = 0; i < sessionStorage.length; i++) { | |
| const key = sessionStorage.key(i); | |
| if (key.startsWith('PREFIX.')) { | |
| token = sessionStorage.getItem(key); | |
| break; | |
| } | |
| } | |
| if (!token) { | |
| token = `PREFIX.${now}`; | |
| console.log(`New token:${token}`); | |
| sessionStorage.setItem(token, token); | |
| } | |
| // clear self | |
| const tokenParts = token.split('.'); | |
| if (tokenParts && tokenParts.length === 2) { | |
| // We are not stale | |
| let localStorageToken = `MAYBE_STALE_PREFIX.${tokenParts[1]}`; | |
| localStorage.removeItem(localStorageToken); | |
| } | |
| // Scan | |
| setInterval(function() { | |
| const now = Date.now(); | |
| const candidates = []; | |
| for(let i = 0; i < localStorage.length; i++) { | |
| const key = localStorage.key(i); | |
| if (key.startsWith('MAYBE_STALE_PREFIX.')) { | |
| const when = localStorage.getItem(key); | |
| if (when && (now - when) > 30000) { | |
| candidates.push(key); | |
| } | |
| } | |
| } | |
| candidates.forEach(key => { | |
| localStorage.removeItem(key); | |
| document.cookie = `${key.substring(6)}=${Date.now()}`; | |
| }) | |
| if (candidates.length > 0) { | |
| console.log(candidates.length) | |
| fetch('clean'); | |
| } | |
| }, 5000); | |
| })(); | |
| </script> | |
| </head> | |
| <body> | |
| <h1>Token</h1> | |
| </body> | |
| </html> |
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| package com.example.properties; | |
| import javax.servlet.http.Cookie; | |
| import javax.servlet.http.HttpServletRequest; | |
| import javax.servlet.http.HttpServletResponse; | |
| import org.springframework.boot.SpringApplication; | |
| import org.springframework.boot.autoconfigure.SpringBootApplication; | |
| import org.springframework.stereotype.Controller; | |
| import org.springframework.web.bind.annotation.GetMapping; | |
| import org.springframework.web.bind.annotation.ResponseBody; | |
| @SpringBootApplication | |
| public class PropertiesApplication { | |
| @Controller | |
| public static class HeaderSize { | |
| @GetMapping("/") | |
| public String headerSize() { | |
| return "index.html"; | |
| } | |
| @GetMapping("/clean") | |
| @ResponseBody | |
| public String cleanup(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) { | |
| Cookie[] cookies = httpServletRequest.getCookies(); | |
| if (cookies != null && cookies.length > 0) { | |
| for (int i = 0; i < cookies.length; i++) { | |
| Cookie cookie = cookies[i]; | |
| if (cookie.getName().startsWith("STALE_PREFIX.")) { | |
| Cookie cookieToDelete = new Cookie(cookie.getName(), null); | |
| cookieToDelete.setMaxAge(0); | |
| cookieToDelete.setPath("/"); | |
| httpServletResponse.addCookie(cookieToDelete); | |
| } | |
| } | |
| try { | |
| Thread.sleep(1000); | |
| } catch (InterruptedException e) { | |
| } | |
| } | |
| return ""; | |
| } | |
| } | |
| public static void main(String[] args) { | |
| SpringApplication.run(PropertiesApplication.class, args); | |
| } | |
| } |
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