initial commit

.gitignore

+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+/.pnp
+.pnp.js
+
+# testing
+/coverage
+
+# production
+/build
+
+# misc
+.DS_Store
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*

.gitlab-ci.yml

+variables:
+  RELEASE_NAME: "SERVICE_NAME"
+  SERVICE_PORT: 80
+  REGISTRY_URL: 279716074232.dkr.ecr.us-east-1.amazonaws.com/pgdockrepo
+
+stages:
+  - Build
+  - ReleaseCleanup
+  - ReleaseDeploy
+  - Validation
+
+Build:
+  stage: Build
+  script:
+  - $(aws ecr get-login --no-include-email --region us-east-1)
+  - docker build -t 279716074232.dkr.ecr.us-east-1.amazonaws.com/pgdockrepo:$CI_PIPELINE_ID .
+  - docker push 279716074232.dkr.ecr.us-east-1.amazonaws.com/pgdockrepo:$CI_PIPELINE_ID
+
+ReleaseCleanup:
+   stage: ReleaseCleanup
+   script: 
+   -  echo `pwd`
+   -  cd ./helm && /usr/local/bin/helm delete --purge $RELEASE_NAME && exit 0
+   allow_failure: true
+
+ReleaseDeploy:
+   stage: ReleaseDeploy
+   script:
+   - echo `pwd`
+   - sed -i s/#BUILD_ID#/$CI_PIPELINE_ID/g ./helm/service/values.yaml 
+   - sed -i s/#SERVICE_PORT#/$SERVICE_PORT/g ./helm/service/values.yaml
+   - cd ./helm && /usr/local/bin/helm install service --name $RELEASE_NAME
+   
+Validation:
+    stage: Validation
+    script:
+    - sleep 45
+    - if [ `curl -s -o /dev/null -I -w "%{http_code}" https://pgsandbox.altimetrik.com/$RELEASE_NAME/` = "200" ]; then exit 0; else exit 1; fi
+    allow_failure: false

Dockerfile

+### STAGE 1: Setup ###
+FROM node:11.4.0 as builder
+RUN mkdir /usr/src/app
+WORKDIR /usr/src/app
+ENV PATH /usr/src/app/node_modules/.bin :$PATH
+COPY package.json /usr/src/app/package.json
+RUN npm install --silent
+RUN npm install react-scripts@1.1.1 -g --silent
+COPY . /usr/src/app
+RUN npm run build 
+### STAGE 2: Setup ###
+FROM nginx:1.14.1-alpine
+COPY nginx/default.conf /etc/nginx/conf.d/
+RUN rm -rf /usr/share/nginx/html/*
+COPY --from=builder /usr/src/app/build /usr/share/nginx/html/SERVICE_NAME
+CMD ["nginx", "-g", "daemon off;"]
\ No newline at end of file

README.md

+This project was bootstrapped with [Create React App](https://github.com/facebook/create-react-app).
+
+## Available Scripts
+
+In the project directory, you can run:
+
+### `npm start`
+
+Runs the app in the development mode.<br>
+Open [http://localhost:3000](http://localhost:3000) to view it in the browser.
+
+The page will reload if you make edits.<br>
+You will also see any lint errors in the console.
+
+### `npm test`
+
+Launches the test runner in the interactive watch mode.<br>
+See the section about [running tests](https://facebook.github.io/create-react-app/docs/running-tests) for more information.
+
+### `npm run build`
+
+Builds the app for production to the `build` folder.<br>
+It correctly bundles React in production mode and optimizes the build for the best performance.
+
+The build is minified and the filenames include the hashes.<br>
+Your app is ready to be deployed!
+
+See the section about [deployment](https://facebook.github.io/create-react-app/docs/deployment) for more information.
+
+### `npm run eject`
+
+**Note: this is a one-way operation. Once you `eject`, you can’t go back!**
+
+If you aren’t satisfied with the build tool and configuration choices, you can `eject` at any time. This command will remove the single build dependency from your project.
+
+Instead, it will copy all the configuration files and the transitive dependencies (Webpack, Babel, ESLint, etc) right into your project so you have full control over them. All of the commands except `eject` will still work, but they will point to the copied scripts so you can tweak them. At this point you’re on your own.
+
+You don’t have to ever use `eject`. The curated feature set is suitable for small and middle deployments, and you shouldn’t feel obligated to use this feature. However we understand that this tool wouldn’t be useful if you couldn’t customize it when you are ready for it.
+
+## Learn More
+
+You can learn more in the [Create React App documentation](https://facebook.github.io/create-react-app/docs/getting-started).
+
+To learn React, check out the [React documentation](https://reactjs.org/).

helm/service/.helmignore

+# Patterns to ignore when building packages.
+# This supports shell glob matching, relative path matching, and
+# negation (prefixed with !). Only one pattern per line.
+.DS_Store
+# Common VCS dirs
+.git/
+.gitignore
+.bzr/
+.bzrignore
+.hg/
+.hgignore
+.svn/
+# Common backup files
+*.swp
+*.bak
+*.tmp
+*~
+# Various IDEs
+.project
+.idea/
+*.tmproj
+.vscode/

helm/service/Chart.yaml

+apiVersion: v1
+appVersion: "1.0"
+description: A Helm chart for Kubernetes
+name: SERVICE_NAME
+version: 0.1.0
\ No newline at end of file

helm/service/templates/NOTES.txt

+1. Get the application URL by running these commands:
+{{- if .Values.ingress.enabled }}
+{{- range $host := .Values.ingress.hosts }}
+  {{- range $.Values.ingress.paths }}
+  http{{ if $.Values.ingress.tls }}s{{ end }}://{{ $host }}{{ . }}
+  {{- end }}
+{{- end }}
+{{- else if contains "NodePort" .Values.service.type }}
+  export NODE_PORT=$(kubectl get --namespace {{ .Release.Namespace }} -o jsonpath="{.spec.ports[0].nodePort}" services {{ include "SERVICE_NAME.fullname" . }})
+  export NODE_IP=$(kubectl get nodes --namespace {{ .Release.Namespace }} -o jsonpath="{.items[0].status.addresses[0].address}")
+  echo http://$NODE_IP:$NODE_PORT
+{{- else if contains "LoadBalancer" .Values.service.type }}
+     NOTE: It may take a few minutes for the LoadBalancer IP to be available.
+           You can watch the status of by running 'kubectl get svc -w {{ include "SERVICE_NAME.fullname" . }}'
+  export SERVICE_IP=$(kubectl get svc --namespace {{ .Release.Namespace }} {{ include "SERVICE_NAME.fullname" . }} -o jsonpath='{.status.loadBalancer.ingress[0].ip}')
+  echo http://$SERVICE_IP:{{ .Values.service.port }}
+{{- else if contains "ClusterIP" .Values.service.type }}
+  export POD_NAME=$(kubectl get pods --namespace {{ .Release.Namespace }} -l "app.kubernetes.io/name={{ include "SERVICE_NAME.name" . }},app.kubernetes.io/instance={{ .Release.Name }}" -o jsonpath="{.items[0].metadata.name}")
+  echo "Visit http://127.0.0.1:8080 to use your application"
+  kubectl port-forward $POD_NAME 8080:80
+{{- end }}
\ No newline at end of file

helm/service/templates/_helpers.tpl

+{{/* vim: set filetype=mustache: */}}
+{{/*
+Expand the name of the chart.
+*/}}
+{{- define "SERVICE_NAME.name" -}}
+{{- default .Chart.Name .Values.nameOverride | trunc 63 | trimSuffix "-" -}}
+{{- end -}}
+
+{{/*
+Create a default fully qualified app name.
+We truncate at 63 chars because some Kubernetes name fields are limited to this (by the DNS naming spec).
+If release name contains chart name it will be used as a full name.
+*/}}
+{{- define "SERVICE_NAME.fullname" -}}
+{{- if .Values.fullnameOverride -}}
+{{- .Values.fullnameOverride | trunc 63 | trimSuffix "-" -}}
+{{- else -}}
+{{- $name := default .Chart.Name .Values.nameOverride -}}
+{{- if contains $name .Release.Name -}}
+{{- .Release.Name | trunc 63 | trimSuffix "-" -}}
+{{- else -}}
+{{- printf "%s-%s" .Release.Name $name | trunc 63 | trimSuffix "-" -}}
+{{- end -}}
+{{- end -}}
+{{- end -}}
+
+{{/*
+Create chart name and version as used by the chart label.
+*/}}
+{{- define "SERVICE_NAME.chart" -}}
+{{- printf "%s-%s" .Chart.Name .Chart.Version | replace "+" "_" | trunc 63 | trimSuffix "-" -}}
+{{- end -}}
\ No newline at end of file

helm/service/templates/deployment.yaml

+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: {{ include "SERVICE_NAME.fullname" . }}
+  labels:
+    app.kubernetes.io/name: {{ include "SERVICE_NAME.name" . }}
+    helm.sh/chart: {{ include "SERVICE_NAME.chart" . }}
+    app.kubernetes.io/instance: {{ .Release.Name }}
+    app.kubernetes.io/managed-by: {{ .Release.Service }}
+spec:
+  replicas: {{ .Values.replicaCount }}
+  selector:
+    matchLabels:
+      app.kubernetes.io/name: {{ include "SERVICE_NAME.name" . }}
+      app.kubernetes.io/instance: {{ .Release.Name }}
+  template:
+    metadata:
+      labels:
+        app.kubernetes.io/name: {{ include "SERVICE_NAME.name" . }}
+        app.kubernetes.io/instance: {{ .Release.Name }}
+    spec:
+      containers:
+        - name: {{ .Chart.Name }}
+          image: "{{ .Values.image.repository }}:{{ .Values.image.tag }}"
+          imagePullPolicy: {{ .Values.image.pullPolicy }}
+          ports:
+            - name: http
+              containerPort: {{ .Values.service.internalport }}
+              protocol: TCP
+          resources:
+            {{- toYaml .Values.resources | nindent 12 }}
+      {{- with .Values.nodeSelector }}
+      nodeSelector:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+    {{- with .Values.affinity }}
+      affinity:
+        {{- toYaml . | nindent 8 }}
+    {{- end }}
+    {{- with .Values.tolerations }}
+      tolerations:
+        {{- toYaml . | nindent 8 }}
+    {{- end }}
\ No newline at end of file

helm/service/templates/ingress.yaml

+{{- if .Values.ingress.enabled -}}
+{{- $fullName := include "SERVICE_NAME.fullname" . -}}
+{{- $ingressPaths := .Values.ingress.paths -}}
+apiVersion: extensions/v1beta1
+kind: Ingress
+metadata:
+  name: {{ $fullName }}
+  labels:
+    app.kubernetes.io/name: {{ include "SERVICE_NAME.name" . }}
+    helm.sh/chart: {{ include "SERVICE_NAME.chart" . }}
+    app.kubernetes.io/instance: {{ .Release.Name }}
+    app.kubernetes.io/managed-by: {{ .Release.Service }}
+  {{- with .Values.ingress.annotations }}
+  annotations:
+    {{- toYaml . | nindent 4 }}
+  {{- end }}
+spec:
+{{- if .Values.ingress.tls }}
+  tls:
+  {{- range .Values.ingress.tls }}
+    - hosts:
+      {{- range .hosts }}
+        - {{ . | quote }}
+      {{- end }}
+      secretName: {{ .secretName }}
+  {{- end }}
+{{- end }}
+  rules:
+  {{- range .Values.ingress.hosts }}
+    - host: {{ . | quote }}
+      http:
+        paths:
+	{{- range $ingressPaths }}
+          - path: {{ . }}
+            backend:
+              serviceName: {{ $fullName }}
+              servicePort: http
+	{{- end }}
+  {{- end }}
+{{- end }}
\ No newline at end of file

helm/service/templates/service.yaml

+apiVersion: v1
+kind: Service
+metadata:
+  name: {{ include "SERVICE_NAME.fullname" . }}
+  labels:
+    app.kubernetes.io/name: {{ include "SERVICE_NAME.name" . }}
+    helm.sh/chart: {{ include "SERVICE_NAME.chart" . }}
+    app.kubernetes.io/instance: {{ .Release.Name }}
+    app.kubernetes.io/managed-by: {{ .Release.Service }}
+spec:
+  type: {{ .Values.service.type }}
+  ports:
+    - port: {{ .Values.service.port }}
+      targetPort: http
+      protocol: TCP
+      name: http
+  selector:
+    app.kubernetes.io/name: {{ include "SERVICE_NAME.name" . }}
+    app.kubernetes.io/instance: {{ .Release.Name }}
\ No newline at end of file

helm/service/templates/tests/test-connection.yaml

+apiVersion: v1
+kind: Pod
+metadata:
+  name: "{{ include "SERVICE_NAME.fullname" . }}-test-connection"
+  labels:
+    app.kubernetes.io/name: {{ include "SERVICE_NAME.name" . }}
+    helm.sh/chart: {{ include "SERVICE_NAME.chart" . }}
+    app.kubernetes.io/instance: {{ .Release.Name }}
+    app.kubernetes.io/managed-by: {{ .Release.Service }}
+  annotations:
+    "helm.sh/hook": test-success
+spec:
+  containers:
+    - name: wget
+      image: busybox
+      command: ['wget']
+      args:  ['{{ include "SERVICE_NAME.fullname" . }}:{{ .Values.service.port }}']
+  restartPolicy: Never
\ No newline at end of file

helm/service/values.yaml

+# Default values for SERVICE_NAME.
+# This is a YAML-formatted file.
+# Declare variables to be passed into your templates.
+
+replicaCount: 1
+
+image:
+  repository: 279716074232.dkr.ecr.us-east-1.amazonaws.com/pgdockrepo
+  tag: #BUILD_ID#
+  pullPolicy: IfNotPresent
+
+nameOverride: ""
+fullnameOverride: ""
+
+service:
+  type: NodePort
+  port: 80
+  internalport: #SERVICE_PORT#
+
+ingress:
+  enabled: true
+  annotations:
+      kubernetes.io/ingress.class: nginx
+      nginx.ingress.kubernetes.io/rewrite-target: /SERVICE_NAME
+      #kubernetes.io/tls-acme: "true"
+  paths:
+     path: /SERVICE_NAME
+  hosts:
+     - pgsandbox.altimetrik.com
+  tls:
+     - secretName: custom-tls-cert
+       hosts:
+         - pgsandbox.altimetrik.com
+
+resources: {}
+  # We usually recommend not to specify default resources and to leave this as a conscious
+  # choice for the user. This also increases chances charts run on environments with little
+  # resources, such as Minikube. If you do want to specify resources, uncomment the following
+  # lines, adjust them as necessary, and remove the curly braces after 'resources:'.
+  # limits:
+  #  cpu: 100m
+  #  memory: 128Mi
+  # requests:
+  #  cpu: 100m
+  #  memory: 128Mi
+
+nodeSelector: {}
+
+tolerations: []
+
+affinity: {}
\ No newline at end of file

nginx/default.conf

+server {
+
+  listen 80;
+
+  sendfile on;
+
+  default_type application/octet-stream;
+
+  gzip on;
+  gzip_http_version 1.1;
+  gzip_disable      "MSIE [1-6]\.";
+  gzip_min_length   256;
+  gzip_vary         on;
+  gzip_proxied      expired no-cache no-store private auth;
+  gzip_types        text/plain text/css application/json application/javascript application/x-javascript text/xml application/xml application/xml+rss text/javascript;
+  gzip_comp_level   9;
+
+  root /usr/share/nginx/html;
+
+  location /SERVICE_NAME/ {
+    add_header Content-Type: text/plain;
+    add_header Access-Control-Allow-Origin *;
+	try_files $uri $uri/ /SERVICE_NAME/index.html?$query_string;
+	# index /usr/share/nginx/html/SERVICE_NAME/index.html?$query_string;
+	# try_files $uri $uri/ =404;
+  }
+
+}

nginx/default.conf.txt

+server {
+
+  listen 80;
+
+  sendfile on;
+
+  default_type application/octet-stream;
+
+  gzip on;
+  gzip_http_version 1.1;
+  gzip_disable      "MSIE [1-6]\.";
+  gzip_min_length   256;
+  gzip_vary         on;
+  gzip_proxied      expired no-cache no-store private auth;
+  gzip_types        text/plain text/css application/json application/javascript application/x-javascript text/xml application/xml application/xml+rss text/javascript;
+  gzip_comp_level   9;
+
+  root /usr/share/nginx/html;
+
+  location / {
+    try_files $uri $uri/ /index.html =404;
+  }
+
+}
\ No newline at end of file

package.json

+{
+  "homepage" : "https://pgsandbox.altimetrik.com/SERVICE_NAME/",
+  "name": "react-template",
+  "version": "0.1.0",
+  "private": true,
+  "dependencies": {
+    "react": "^16.6.3",
+    "react-dom": "^16.6.3",
+    "react-scripts": "2.1.1",
+    "terser": "3.14.1"
+  },
+  "scripts": {
+    "start": "PORT=3000 react-scripts start",
+    "build": "react-scripts build",
+    "test": "react-scripts test",
+    "eject": "react-scripts eject"
+  },
+  "eslintConfig": {
+    "extends": "react-app"
+  },
+  "browserslist": [
+    ">0.2%",
+    "not dead",
+    "not ie <= 11",
+    "not op_mini all"
+  ]
+}

public/index.html

+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8">
+    <link rel="shortcut icon" href="%PUBLIC_URL%/favicon.ico">
+    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
+    <meta name="theme-color" content="#000000">
+    <!--
+      manifest.json provides metadata used when your web app is added to the
+      homescreen on Android. See https://developers.google.com/web/fundamentals/web-app-manifest/
+    -->
+    <link rel="manifest" href="%PUBLIC_URL%/manifest.json">
+    <!--
+      Notice the use of %PUBLIC_URL% in the tags above.
+      It will be replaced with the URL of the `public` folder during the build.
+      Only files inside the `public` folder can be referenced from the HTML.
+
+      Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will
+      work correctly both with client-side routing and a non-root public URL.
+      Learn how to configure a non-root public URL by running `npm run build`.
+    -->
+    <title>React App</title>
+  </head>
+  <body>
+    <noscript>
+      You need to enable JavaScript to run this app.
+    </noscript>
+    <div id="root"></div>
+    <!--
+      This HTML file is a template.
+      If you open it directly in the browser, you will see an empty page.
+
+      You can add webfonts, meta tags, or analytics to this file.
+      The build step will place the bundled scripts into the <body> tag.
+
+      To begin the development, run `npm start` or `yarn start`.
+      To create a production bundle, use `npm run build` or `yarn build`.
+    -->
+  </body>
+</html>

public/manifest.json

+{
+  "short_name": "React App",
+  "name": "Create React App Sample",
+  "icons": [
+    {
+      "src": "favicon.ico",
+      "sizes": "64x64 32x32 24x24 16x16",
+      "type": "image/x-icon"
+    }
+  ],
+  "start_url": ".",
+  "display": "standalone",
+  "theme_color": "#000000",
+  "background_color": "#ffffff"
+}

src/App.css

+.App {
+  text-align: center;
+}
+
+.App-logo {
+  animation: App-logo-spin infinite 20s linear;
+  height: 40vmin;
+}
+
+.App-header {
+  background-color: #282c34;
+  min-height: 100vh;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  font-size: calc(10px + 2vmin);
+  color: white;
+}
+
+.App-link {
+  color: #61dafb;
+}
+
+@keyframes App-logo-spin {
+  from {
+    transform: rotate(0deg);
+  }
+  to {
+    transform: rotate(360deg);
+  }
+}

src/App.js

+import React, { Component } from 'react';
+import './App.css';
+
+class App extends Component {
+  render() {
+    return (
+      <div className="App">
+        <header className="App-header">
+          <p>
+           Welcome to Playground!
+          </p>
+        </header>
+      </div>
+    );
+  }
+}
+
+export default App;

src/App.test.js

+import React from 'react';
+import ReactDOM from 'react-dom';
+import App from './App';
+
+it('renders without crashing', () => {
+  const div = document.createElement('div');
+  ReactDOM.render(<App />, div);
+  ReactDOM.unmountComponentAtNode(div);
+});

src/index.css

+body {
+  margin: 0;
+  padding: 0;
+  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen",
+    "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue",
+    sans-serif;
+  -webkit-font-smoothing: antialiased;
+  -moz-osx-font-smoothing: grayscale;
+}
+
+code {
+  font-family: source-code-pro, Menlo, Monaco, Consolas, "Courier New",
+    monospace;
+}

src/index.js

+import React from 'react';
+import ReactDOM from 'react-dom';
+import './index.css';
+import App from './App';
+import * as serviceWorker from './serviceWorker';
+
+ReactDOM.render(<App />, document.getElementById('root'));
+
+// If you want your app to work offline and load faster, you can change
+// unregister() to register() below. Note this comes with some pitfalls.
+// Learn more about service workers: http://bit.ly/CRA-PWA
+serviceWorker.unregister();

src/logo.svg

+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 841.9 595.3">
+    <g fill="#61DAFB">
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src/serviceWorker.js

+// This optional code is used to register a service worker.
+// register() is not called by default.
+
+// This lets the app load faster on subsequent visits in production, and gives
+// it offline capabilities. However, it also means that developers (and users)
+// will only see deployed updates on subsequent visits to a page, after all the
+// existing tabs open on the page have been closed, since previously cached
+// resources are updated in the background.
+
+// To learn more about the benefits of this model and instructions on how to
+// opt-in, read http://bit.ly/CRA-PWA
+
+const isLocalhost = Boolean(
+  window.location.hostname === 'localhost' ||
+    // [::1] is the IPv6 localhost address.
+    window.location.hostname === '[::1]' ||
+    // 127.0.0.1/8 is considered localhost for IPv4.
+    window.location.hostname.match(
+      /^127(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/
+    )
+);
+
+export function register(config) {
+  if (process.env.NODE_ENV === 'production' && 'serviceWorker' in navigator) {
+    // The URL constructor is available in all browsers that support SW.
+    const publicUrl = new URL(process.env.PUBLIC_URL, window.location.href);
+    if (publicUrl.origin !== window.location.origin) {
+      // Our service worker won't work if PUBLIC_URL is on a different origin
+      // from what our page is served on. This might happen if a CDN is used to
+      // serve assets; see https://github.com/facebook/create-react-app/issues/2374
+      return;
+    }
+
+    window.addEventListener('load', () => {
+      const swUrl = `${process.env.PUBLIC_URL}/service-worker.js`;
+
+      if (isLocalhost) {
+        // This is running on localhost. Let's check if a service worker still exists or not.
+        checkValidServiceWorker(swUrl, config);
+
+        // Add some additional logging to localhost, pointing developers to the
+        // service worker/PWA documentation.
+        navigator.serviceWorker.ready.then(() => {
+          console.log(
+            'This web app is being served cache-first by a service ' +
+              'worker. To learn more, visit http://bit.ly/CRA-PWA'
+          );
+        });
+      } else {
+        // Is not localhost. Just register service worker
+        registerValidSW(swUrl, config);
+      }
+    });
+  }
+}
+
+function registerValidSW(swUrl, config) {
+  navigator.serviceWorker
+    .register(swUrl)
+    .then(registration => {
+      registration.onupdatefound = () => {
+        const installingWorker = registration.installing;
+        if (installingWorker == null) {
+          return;
+        }
+        installingWorker.onstatechange = () => {
+          if (installingWorker.state === 'installed') {
+            if (navigator.serviceWorker.controller) {
+              // At this point, the updated precached content has been fetched,
+              // but the previous service worker will still serve the older
+              // content until all client tabs are closed.
+              console.log(
+                'New content is available and will be used when all ' +
+                  'tabs for this page are closed. See http://bit.ly/CRA-PWA.'
+              );
+
+              // Execute callback
+              if (config && config.onUpdate) {
+                config.onUpdate(registration);
+              }
+            } else {
+              // At this point, everything has been precached.
+              // It's the perfect time to display a
+              // "Content is cached for offline use." message.
+              console.log('Content is cached for offline use.');
+
+              // Execute callback
+              if (config && config.onSuccess) {
+                config.onSuccess(registration);
+              }
+            }
+          }
+        };
+      };
+    })
+    .catch(error => {
+      console.error('Error during service worker registration:', error);
+    });
+}
+
+function checkValidServiceWorker(swUrl, config) {
+  // Check if the service worker can be found. If it can't reload the page.
+  fetch(swUrl)
+    .then(response => {
+      // Ensure service worker exists, and that we really are getting a JS file.
+      const contentType = response.headers.get('content-type');
+      if (
+        response.status === 404 ||
+        (contentType != null && contentType.indexOf('javascript') === -1)
+      ) {
+        // No service worker found. Probably a different app. Reload the page.
+        navigator.serviceWorker.ready.then(registration => {
+          registration.unregister().then(() => {
+            window.location.reload();
+          });
+        });
+      } else {
+        // Service worker found. Proceed as normal.
+        registerValidSW(swUrl, config);
+      }
+    })
+    .catch(() => {
+      console.log(
+        'No internet connection found. App is running in offline mode.'
+      );
+    });
+}
+
+export function unregister() {
+  if ('serviceWorker' in navigator) {
+    navigator.serviceWorker.ready.then(registration => {
+      registration.unregister();
+    });
+  }
+}