iis-sensor : show a page notification if served by Microsoft-IIS server

background.js

"use strict";

var IIS_SERVER_LIST = new Set();

browser.webRequest.onHeadersReceived.addListener((e) => {
  for (let header of e.responseHeaders) {
    if ("server" === header.name.toLowerCase()) {
      if (header.value.startsWith("Microsoft-IIS/")) {
        let url = new URL(e.url);
        IIS_SERVER_LIST.add(url.host);
      }
      break;
    }
  }
}, {
  urls: ["<all_urls>"]
}, ["responseHeaders"]);

browser.tabs.onUpdated.addListener((tabId, changeInfo, tab) => {
  if (tab.url) {
    let url = new URL(tab.url);
    if (IIS_SERVER_LIST.has(url.host)) {
      browser.pageAction.show(tab.id);
    } else {
      browser.pageAction.hide(tab.id);
    }
  }
});

iis.png

manifest.json

{
  "description": "IIS web server sensor",
  "manifest_version": 2,
  "name": "iis-sensor",
  "version": "0.0.0",
  "homepage_url": "https://twitter.com/diffshare/status/865016052622610432",
  "permissions": [
    "activeTab",
    "tabs",
    "webRequest",
    "<all_urls>"
  ],
  "page_action": {
    "default_icon": "iis.png",
    "browser_style": true
  },
  "background": {
    "scripts": ["background.js"]
  }
}