Working project

.gitignore

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+Publish/
+dist/
+Caddy/caddy.exe

Caddy/caddyfile

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+http://localhost:7070 {
+  root * ../publish
+  file_server
+}

Proof/.gitignore

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+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+.pnpm-debug.log*
+
+# Diagnostic reports (https://nodejs.org/api/report.html)
+report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+*.lcov
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (https://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# Snowpack dependency directory (https://snowpack.dev/)
+web_modules/
+
+# TypeScript cache
+*.tsbuildinfo
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional stylelint cache
+.stylelintcache
+
+# Microbundle cache
+.rpt2_cache/
+.rts2_cache_cjs/
+.rts2_cache_es/
+.rts2_cache_umd/
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variable files
+.env
+.env.development.local
+.env.test.local
+.env.production.local
+.env.local
+
+# parcel-bundler cache (https://parceljs.org/)
+.cache
+.parcel-cache
+
+# Next.js build output
+.next
+out
+
+# Nuxt.js build / generate output
+.nuxt
+dist
+
+# Gatsby files
+.cache/
+# Comment in the public line in if your project uses Gatsby and not Next.js
+# https://nextjs.org/blog/next-9-1#public-directory-support
+# public
+
+# vuepress build output
+.vuepress/dist
+
+# vuepress v2.x temp and cache directory
+.temp
+.cache
+
+# Docusaurus cache and generated files
+.docusaurus
+
+# Serverless directories
+.serverless/
+
+# FuseBox cache
+.fusebox/
+
+# DynamoDB Local files
+.dynamodb/
+
+# TernJS port file
+.tern-port
+
+# Stores VSCode versions used for testing VSCode extensions
+.vscode-test
+
+# yarn v2
+.yarn/cache
+.yarn/unplugged
+.yarn/build-state.yml
+.yarn/install-state.gz
+.pnp.*

Proof/README.md

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+Where I found to configure a custom build
+https://gist.github.com/layerssss/5d7b69c0f8c6e54e8b501e6e0fe36186
+
+there is a bit of tooling to setup. there is also some things to consider
+I discovered if the publish folder is in the root, the build kept adding all those files to the installer
+The installer didn't put them anywhere that I found.
+The installer was greater than 1 gb when I noticed.
+The build was taking a lot of time until I moved the publish folder.
+
+I feel the installer should be per user. The per machine requires administrative access.
+
+I was able to work out the process that allowed the autoupdater to run before the window is shown. 
+We should display a window that an update is downloading. This will keep the user from clicking multiple times.
+That can be displayed in the update-available event.

Proof/build/electron-publisher-custom.js

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+const { Publisher } = require("electron-publish");
+const fsPromises = require("fs/promises");
+const path = require("path");
+
+module.exports = class CustomPublisher extends Publisher {
+  // more about task:
+  //   https://github.com/electron-userland/electron-builder/blob/a94532164709a545c0f6551fdc336dbc5377bda8/packages/electron-publish/src/publisher.ts#L29
+  async upload(task) {
+    const filename = path.basename(task.file);
+    await fsPromises.cp(
+      task.file,
+      path.join(__dirname, "../../publish", filename)
+    );
+  }
+};

Proof/package.json

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+{
+	"name": "autoupdateproof",
+	"productName": "Auto updater proof",
+	"version": "1.0.5",
+	"description": "Auto updater proof of concept",
+	"main": "src/js/main.js",
+	"scripts": {
+		"start": "electron .",
+		"dist": "electron-builder --publish always"
+	},
+	"build": {
+		"appId": "com.tracypearson.autoupdateproof",
+		"win": {
+			"target": "nsis",
+			"publish": {
+				"provider": "custom"
+			}
+		},
+		"nsis": {
+			"oneClick": false,
+			"perMachine": true,
+			"allowToChangeInstallationDirectory": true,
+			"installerIcon": null
+		}
+	},
+	"author": "Tracy Pearson",
+	"license": "MIT",
+	"dependencies": {
+		"electron-updater": "^5.3.0"
+	},
+	"devDependencies": {
+		"electron": "^23.0.0",
+		"electron-builder": "^23.6.0"
+	}
+}

Proof/src/index.html

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+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="UTF-8" />
+    <!-- https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP -->
+    <meta
+      http-equiv="Content-Security-Policy"
+      content="default-src 'self'; script-src 'self'"
+    />
+    <meta
+      http-equiv="X-Content-Security-Policy"
+      content="default-src 'self'; script-src 'self'"
+    />
+    <title>Hello from Electron renderer!</title>
+  </head>
+  <body>
+    <h1>Hello from Electron renderer!</h1>
+    <p>👋</p>
+	<p id="info"></p>
+  </body>
+  <script src="./js/renderer.js"></script>
+</html>

Proof/src/js/main.js

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+const { app, BrowserWindow, ipcMain } = require('electron')
+const path = require('path')
+
+const createWindow = () => {
+	const win = new BrowserWindow({
+		width: 800,
+		height: 600,
+		webPreferences: {
+			preload: path.join(__dirname, 'preload.js')
+		}
+	})
+	ipcMain.handle('ping', () => 'pong')
+	ipcMain.handle('getVersion',() => app.getVersion())
+	win.loadFile('src/index.html')
+}
+
+app.on('window-all-closed', () => {
+	if (process.platform !== 'darwin') app.quit()
+})
+
+
+function runUpdater() {
+	const { autoUpdater } = require("electron-updater")
+
+	autoUpdater.on('update-downloaded', () => {
+		autoUpdater.quitAndInstall()
+	})
+	autoUpdater.on('update-available', () => {
+		autoUpdater.downloadUpdate()
+	})
+	autoUpdater.on('update-not-available', () => {
+		createWindow()
+	})
+	 autoUpdater.setFeedURL("http://localhost:7070")
+	 autoUpdater.checkForUpdates()
+}
+
+app.whenReady().then(() => {
+	runUpdater()
+})

Proof/src/js/preload.js

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+const { contextBridge, ipcRenderer } = require('electron')
+
+contextBridge.exposeInMainWorld('versions', {
+  getNodeVersion: () => process.versions.node,
+  getChromeVersion: () => process.versions.chrome,
+  getElectronVersion: () => process.versions.electron,
+  getAppVersion: () => ipcRenderer.invoke('getVersion'),
+  ping: () => ipcRenderer.invoke('ping')
+  // we can also expose variables, not just functions
+})

Proof/src/js/renderer.js

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+const information = document.getElementById('info')
+async function setInnerTextOfInfo() {
+	let appVersion = await window.versions.getAppVersion()
+	information.innerText = `This app is version (v${appVersion}) using Chrome (v${versions.getChromeVersion()}), Node.js (v${versions.getNodeVersion()}), and Electron (v${versions.getElectronVersion()})`
+}
+setInnerTextOfInfo()
+
+const func = async() => {
+	const response = await window.versions.ping()
+	console.log(response)
+}
+
+func()