feat(Cert): now has validity check

ts/smartacme.classes.cert.ts

@@ -5,7 +5,6 @@ import * as interfaces from './interfaces';
 import { CertManager } from './smartacme.classes.certmanager';
 
 import { Collection, svDb, unI } from '@pushrocks/smartdata';
-import { ICert } from './interfaces';
 
 @plugins.smartdata.Collection(() => {
   return CertManager.activeDB;
@@ -29,7 +28,26 @@ export class Cert extends plugins.smartdata.SmartDataDbDoc<Cert> implements inte
   @svDb()
   public csr: string;
 
-  constructor(optionsArg: ICert) {
+
+
+  /**
+   * computed value for when the certificate is still valid
+   */
+  get validUntil (): number {
+    return this.created + plugins.smarttime.getMilliSecondsFromUnits({
+      days: 90
+    });
+  }
+
+
+  get isStillValid (): boolean {
+    const shouldBeValitAtLeastUntil = Date.now() + plugins.smarttime.getMilliSecondsFromUnits({
+      days: 10
+    });
+    return this.validUntil >= shouldBeValitAtLeastUntil;
+  }
+
+  constructor(optionsArg: interfaces.ICert) {
     super();
     if (optionsArg) {
       Object.keys(optionsArg).forEach(key => {