Feat: Add Barebones certificate info display

server/model/monitor.js

@@ -6,7 +6,7 @@ dayjs.extend(utc)
 dayjs.extend(timezone)
 const axios = require("axios");
 const {UP, DOWN, PENDING} = require("../util");
-const {tcping, ping} = require("../util-server");
+const {tcping, ping, checkCertificate} = require("../util-server");
 const {R} = require("redbean-node");
 const {BeanModel} = require("redbean-node/dist/bean-model");
 const {Notification} = require("../notification")
@@ -79,6 +79,9 @@ class Monitor extends BeanModel {
                     })
                     bean.msg = `${res.status} - ${res.statusText}`
                     bean.ping = dayjs().valueOf() - startTime;
+                    if (this.url.startsWith("https")) {
+                        Monitor.sendCertInfo(checkCertificate(res), io, this.id, this.user_id);
+                    }
 
                     if (this.type === "http") {
                         bean.status = UP;
@@ -218,6 +221,14 @@ class Monitor extends BeanModel {
         io.to(userID).emit("avgPing", monitorID, avgPing);
     }
 
+    /**
+     *
+     * @param checkCertificateResult : Object return result of checkCertificate
+     */
+     static async sendCertInfo(checkCertificateResult, io, monitorID, userID) {
+        io.to(userID).emit("certInfo", monitorID, checkCertificateResult);
+    }
+
     /**
      * Uptime with calculation
      * Calculation based on:

server/util-server.js

@@ -70,3 +70,53 @@ exports.getSettings = async function (type) {
 
     return result;
 }
+
+
+// ssl-checker by @dyaa
+// param: res - response object from axios
+// return an object containing the certificate information
+
+const getDaysBetween = (validFrom, validTo) =>
+    Math.round(Math.abs(+validFrom - +validTo) / 8.64e7);
+
+const getDaysRemaining = (validFrom, validTo) => {
+    const daysRemaining = getDaysBetween(validFrom, validTo);
+    if (new Date(validTo).getTime() < new Date().getTime()) {
+        return -daysRemaining;
+    }
+    return daysRemaining;
+};
+
+exports.checkCertificate = function (res) {
+    const {
+        valid_from,
+        valid_to,
+        subjectaltname,
+        issuer,
+        fingerprint,
+    } = res.request.res.socket.getPeerCertificate(false);
+
+    if (!valid_from || !valid_to || !subjectaltname) {
+        reject(new Error('No certificate'));
+        return;
+    }
+
+    const valid = res.request.res.socket.authorized || false;
+
+    const validTo = new Date(valid_to);
+
+    const validFor = subjectaltname
+        .replace(/DNS:|IP Address:/g, "")
+        .split(", ");
+
+    const daysRemaining = getDaysRemaining(new Date(), validTo);
+
+    return {
+        valid,
+        validFor,
+        validTo,
+        daysRemaining,
+        issuer,
+        fingerprint,
+    };
+}