src/welcome.ts - vscode-go - Git at Google

 /* eslint-disable no-case-declarations */
 /*---------------------------------------------------------
  * Copyright 2020 The Go Authors. All rights reserved.
  * Licensed under the MIT License. See LICENSE in the project root for license information.
  *--------------------------------------------------------*/

 // This code is modified from:
 // https://github.com/microsoft/vscode-extension-samples/tree/master/webview-sample

 import vscode = require('vscode');
 import path = require('path');
 import semver = require('semver');
 import { extensionId } from './const';
 import { GoExtensionContext } from './context';
 import { extensionInfo } from './config';
 import { getFromGlobalState, updateGlobalState } from './stateUtils';
 import { createRegisterCommand } from './commands';

 export class WelcomePanel {
 	public static activate(ctx: vscode.ExtensionContext, goCtx: GoExtensionContext) {
 		const registerCommand = createRegisterCommand(ctx, goCtx);
 		registerCommand('go.welcome', WelcomePanel.createOrShow);

 		if (vscode.window.registerWebviewPanelSerializer) {
 			// Make sure we register a serializer in activation event
 			vscode.window.registerWebviewPanelSerializer(WelcomePanel.viewType, {
 				async deserializeWebviewPanel(webviewPanel: vscode.WebviewPanel) {
 					WelcomePanel.revive(webviewPanel, ctx.extensionUri);
 				}
 			});
 		}

 		// Show the Go welcome page on update.
 		if (!extensionInfo.isInCloudIDE && vscode.workspace.getConfiguration('go.showWelcome')) {
 			showGoWelcomePage();
 		}
 	}

 	public static currentPanel: WelcomePanel | undefined;

 	public static readonly viewType = 'welcomeGo';

 	public static createOrShow(ctx: Pick<vscode.ExtensionContext, 'extensionUri'>) {
 		return () => {
 			const extensionUri = ctx.extensionUri;
 			const column = vscode.window.activeTextEditor ? vscode.window.activeTextEditor.viewColumn : undefined;

 			// If we already have a panel, show it.
 			if (WelcomePanel.currentPanel) {
 				WelcomePanel.currentPanel.panel.reveal(column);
 				return;
 			}

 			// Otherwise, create a new panel.
 			const panel = vscode.window.createWebviewPanel(
 				WelcomePanel.viewType,
 				'Go for VS Code',
 				column || vscode.ViewColumn.One,
 				{
 					// Enable javascript in the webview
 					enableScripts: true,

 					// And restrict the webview to only loading content from our extension's directory.
 					localResourceRoots: [joinPath(extensionUri)]
 				}
 			);
 			panel.iconPath = joinPath(extensionUri, 'media', 'go-logo-blue.png');

 			WelcomePanel.currentPanel = new WelcomePanel(panel, extensionUri);
 		};
 	}

 	public static revive(panel: vscode.WebviewPanel, extensionUri: vscode.Uri) {
 		WelcomePanel.currentPanel = new WelcomePanel(panel, extensionUri);
 	}

 	public readonly dataroot: vscode.Uri; // exported for testing.
 	private readonly panel: vscode.WebviewPanel;
 	private readonly extensionUri: vscode.Uri;
 	private disposables: vscode.Disposable[] = [];

 	private constructor(panel: vscode.WebviewPanel, extensionUri: vscode.Uri) {
 		this.panel = panel;
 		this.extensionUri = extensionUri;
 		this.dataroot = joinPath(this.extensionUri, 'media');

 		// Set the webview's initial html content
 		this.update();

 		// Listen for when the panel is disposed
 		// This happens when the user closes the panel or when the panel is closed programatically
 		this.panel.onDidDispose(() => this.dispose(), null, this.disposables);

 		// Handle messages from the webview
 		this.panel.webview.onDidReceiveMessage(
 			(message) => {
 				console.log(message);
 				switch (message.command) {
 					case 'alert':
 						vscode.window.showErrorMessage(message.text);
 						return;
 					case 'openDocument':
 						const uri = joinPath(this.extensionUri, message.document);
 						vscode.commands.executeCommand('markdown.showPreviewToSide', uri);
 						return;
 					case 'openSetting':
 						vscode.commands.executeCommand('workbench.action.openSettings', message.setting);
 						return;
 				}
 			},
 			null,
 			this.disposables
 		);
 	}

 	public dispose() {
 		WelcomePanel.currentPanel = undefined;

 		// Clean up our resources
 		this.panel.dispose();

 		while (this.disposables.length) {
 			const x = this.disposables.pop();
 			if (x) {
 				x.dispose();
 			}
 		}
 	}

 	private update() {
 		const webview = this.panel.webview;
 		this.panel.webview.html = this.getHtmlForWebview(webview);
 	}

 	private getHtmlForWebview(webview: vscode.Webview) {
 		// Local path to css styles and images
 		const scriptPathOnDisk = joinPath(this.dataroot, 'welcome.js');
 		const stylePath = joinPath(this.dataroot, 'welcome.css');
 		const announcePath = vscode.Uri.joinPath(this.dataroot, 'announce.png');
 		const gopherPath = joinPath(this.dataroot, 'go-logo-blue.png');
 		const goExtension = vscode.extensions.getExtension(extensionId)!;
 		const goExtensionVersion = goExtension.packageJSON.version;

 		// Uri to load styles and images into webview
 		const scriptURI = webview.asWebviewUri(scriptPathOnDisk);
 		const stylesURI = webview.asWebviewUri(stylePath);
 		const gopherURI = webview.asWebviewUri(gopherPath);
 		const announceURI = webview.asWebviewUri(announcePath);

 		// Use a nonce to only allow specific scripts to be run
 		const nonce = getNonce();

 		return `<!DOCTYPE html>
 			<html lang="en">
 			<head>
 				<meta charset="UTF-8">
 				<!--
 					Use a content security policy to only allow loading images from https or from our extension directory,
 					and only allow scripts that have a specific nonce.
 				-->
 				<meta http-equiv="Content-Security-Policy" content="default-src 'none'; style-src ${webview.cspSource}; img-src ${webview.cspSource} https:; script-src 'nonce-${nonce}';">
 				<meta name="viewport" content="width=device-width, initial-scale=1.0">
 				<link href="${stylesURI}" rel="stylesheet">
 				<title>Go for VS Code</title>
 			</head>
 			<body>
 			<main class="Content">
 			<div class="Header">
 				<img src="${gopherURI}" alt="Go Logo" class="Header-logo"/>
 				<div class="Header-details">
 					<h1 class="Header-title">Go for VS Code v${goExtensionVersion}</h1>
 					<p>The official Go extension for Visual Studio Code, providing rich language support for Go projects.</p>
 					<ul class="Header-links">
 						<!--
 							Here and elsewhere, we must use a fake anchor for command buttons, to get styling
 							consistent with links. We can't fake this using CSS, as it conflicts with theming.
 						-->
 						<li><a href="#" class="Command" data-command="openDocument" data-document="CHANGELOG.md">Release notes</a></li>
 						<li><a href="https://github.com/golang/vscode-go">GitHub</a></li>
 						<li><a href="https://stackoverflow.com/questions/tagged/go+visual-studio-code">Questions</a></li>
 						<li><a href="https://invite.slack.golangbridge.org/">Slack</a></li>
 					</ul>
 				</div>
 			</div>

 			<div class="Announcement">
 				<img src="${announceURI}" alt="announce" class="Announcement-image" />
 				<p>
 					New!
 					We are excited to announce a new
 					<a href="https://github.com/golang/vscode-go/wiki/features#analyze-vulnerabilities-in-dependencies">code analysis feature</a>
 					that surfaces known vulnerabilities in your dependencies.
 					<br>
 					This vulncheck analyzer is backed by <a href="https://go.dev/security/vulndb">
 					Go's vulnerability database</a> and the Go language server's integration of
 					<a href="https://golang.org/x/vuln/cmd/govulncheck"><code>govulncheck</code></a>.
 					Read <a href="https://go.dev/blog/vuln">"Go's support for vulnerability management"</a>
 					to learn about the Go team's approach to helping Go developers secure their open-source dependencies.
 					Please share your feedback at
 					<a href="https://go.dev/s/vsc-vulncheck-feedback">go.dev/s/vsc-vulncheck-feedback</a>,
 					and report a bug in
 					<a href="https://github.com/golang/vscode-go/issues/new">our issue tracker</a>.
 				</p>
 			</div>

 			<div class="Cards">
 				<div class="Card">
 					<div class="Card-inner">
 						<p class="Card-title">Getting started</p>
 						<p class="Card-content">Learn about the Go extension in our
 							<a href="https://github.com/golang/vscode-go/blob/master/README.md">README</a>.
 						</p>
 					</div>
 				</div>

 				<div class="Card">
 					<div class="Card-inner">
 						<p class="Card-title">Learning Go</p>
 						<p class="Card-content">If you're new to the Go programming language,
 							<a href="https://go.dev/learn">go.dev/learn</a> is a great place to get started.</a>
 						</p>
 					</div>
 				</div>

 				<div class="Card">
 					<div class="Card-inner">
 						<p class="Card-title">Troubleshooting</p>
 						<p class="Card-content">Experiencing problems? Start with our
 							<a href="https://github.com/golang/vscode-go/blob/master/docs/troubleshooting.md">troubleshooting guide</a>.  </p> </div>
 				</div>
 			</div>
 			</main>

 			<script nonce="${nonce}" src="${scriptURI}"></script>
 			</body>
 			</html>`;
 	}
 }

 function getNonce() {
 	let text = '';
 	const possible = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
 	for (let i = 0; i < 32; i++) {
 		text += possible.charAt(Math.floor(Math.random() * possible.length));
 	}
 	return text;
 }

 function joinPath(uri: vscode.Uri, ...pathFragment: string[]): vscode.Uri {
 	// Reimplementation of
 	// https://github.com/microsoft/vscode/blob/b251bd952b84a3bdf68dad0141c37137dac55d64/src/vs/base/common/uri.ts#L346-L357
 	// with Node.JS path. This is a temporary workaround for https://github.com/eclipse-theia/theia/issues/8752.
 	if (!uri.path) {
 		throw new Error('[UriError]: cannot call joinPaths on URI without path');
 	}
 	return uri.with({ path: vscode.Uri.file(path.join(uri.fsPath, ...pathFragment)).path });
 }

 function showGoWelcomePage() {
 	// Update this list of versions when there is a new version where we want to
 	// show the welcome page on update.
 	const showVersions: string[] = ['0.37.0'];
 	// TODO(hyangah): use the content hash instead of hard-coded string.
 	// https://github.com/golang/vscode-go/issue/1179
 	let goExtensionVersion = '0.37.0';
 	let goExtensionVersionKey = 'go.extensionVersion';
 	if (extensionInfo.isPreview) {
 		goExtensionVersion = '0.0.0';
 		goExtensionVersionKey = 'go.nightlyExtensionVersion';
 	}

 	const savedGoExtensionVersion = getFromGlobalState(goExtensionVersionKey, '');

 	if (shouldShowGoWelcomePage(showVersions, goExtensionVersion, savedGoExtensionVersion)) {
 		vscode.commands.executeCommand('go.welcome');
 	}
 	if (goExtensionVersion !== savedGoExtensionVersion) {
 		updateGlobalState(goExtensionVersionKey, goExtensionVersion);
 	}
 }

 export function shouldShowGoWelcomePage(showVersions: string[], newVersion: string, oldVersion: string): boolean {
 	if (newVersion === oldVersion) {
 		return false;
 	}
 	const coercedNew = semver.coerce(newVersion);
 	const coercedOld = semver.coerce(oldVersion);
 	if (!coercedNew || !coercedOld) {
 		return true;
 	}
 	// Both semver.coerce(0.22.0) and semver.coerce(0.22.0-rc.1) will be 0.22.0.
 	return semver.gte(coercedNew, coercedOld) && showVersions.includes(coercedNew.toString());
 }
	/* eslint-disable no-case-declarations */
	/*---------------------------------------------------------
	* Copyright 2020 The Go Authors. All rights reserved.
	* Licensed under the MIT License. See LICENSE in the project root for license information.
	--------------------------------------------------------/

	// This code is modified from:
	// https://github.com/microsoft/vscode-extension-samples/tree/master/webview-sample

	import vscode = require('vscode');
	import path = require('path');
	import semver = require('semver');
	import { extensionId } from './const';
	import { GoExtensionContext } from './context';
	import { extensionInfo } from './config';
	import { getFromGlobalState, updateGlobalState } from './stateUtils';
	import { createRegisterCommand } from './commands';

	export class WelcomePanel {
	public static activate(ctx: vscode.ExtensionContext, goCtx: GoExtensionContext) {
	const registerCommand = createRegisterCommand(ctx, goCtx);
	registerCommand('go.welcome', WelcomePanel.createOrShow);

	if (vscode.window.registerWebviewPanelSerializer) {
	// Make sure we register a serializer in activation event
	vscode.window.registerWebviewPanelSerializer(WelcomePanel.viewType, {
	async deserializeWebviewPanel(webviewPanel: vscode.WebviewPanel) {
	WelcomePanel.revive(webviewPanel, ctx.extensionUri);
	}
	});
	}

	// Show the Go welcome page on update.
	if (!extensionInfo.isInCloudIDE && vscode.workspace.getConfiguration('go.showWelcome')) {
	showGoWelcomePage();
	}
	}

	public static currentPanel: WelcomePanel \| undefined;

	public static readonly viewType = 'welcomeGo';

	public static createOrShow(ctx: Pick<vscode.ExtensionContext, 'extensionUri'>) {
	return () => {
	const extensionUri = ctx.extensionUri;
	const column = vscode.window.activeTextEditor ? vscode.window.activeTextEditor.viewColumn : undefined;

	// If we already have a panel, show it.
	if (WelcomePanel.currentPanel) {
	WelcomePanel.currentPanel.panel.reveal(column);
	return;
	}

	// Otherwise, create a new panel.
	const panel = vscode.window.createWebviewPanel(
	WelcomePanel.viewType,
	'Go for VS Code',
	column \|\| vscode.ViewColumn.One,
	{
	// Enable javascript in the webview
	enableScripts: true,

	// And restrict the webview to only loading content from our extension's directory.
	localResourceRoots: [joinPath(extensionUri)]
	}
	);
	panel.iconPath = joinPath(extensionUri, 'media', 'go-logo-blue.png');

	WelcomePanel.currentPanel = new WelcomePanel(panel, extensionUri);
	};
	}

	public static revive(panel: vscode.WebviewPanel, extensionUri: vscode.Uri) {
	WelcomePanel.currentPanel = new WelcomePanel(panel, extensionUri);
	}

	public readonly dataroot: vscode.Uri; // exported for testing.
	private readonly panel: vscode.WebviewPanel;
	private readonly extensionUri: vscode.Uri;
	private disposables: vscode.Disposable[] = [];

	private constructor(panel: vscode.WebviewPanel, extensionUri: vscode.Uri) {
	this.panel = panel;
	this.extensionUri = extensionUri;
	this.dataroot = joinPath(this.extensionUri, 'media');

	// Set the webview's initial html content
	this.update();

	// Listen for when the panel is disposed
	// This happens when the user closes the panel or when the panel is closed programatically
	this.panel.onDidDispose(() => this.dispose(), null, this.disposables);

	// Handle messages from the webview
	this.panel.webview.onDidReceiveMessage(
	(message) => {
	console.log(message);
	switch (message.command) {
	case 'alert':
	vscode.window.showErrorMessage(message.text);
	return;
	case 'openDocument':
	const uri = joinPath(this.extensionUri, message.document);
	vscode.commands.executeCommand('markdown.showPreviewToSide', uri);
	return;
	case 'openSetting':
	vscode.commands.executeCommand('workbench.action.openSettings', message.setting);
	return;
	}
	},
	null,
	this.disposables
	);
	}

	public dispose() {
	WelcomePanel.currentPanel = undefined;

	// Clean up our resources
	this.panel.dispose();

	while (this.disposables.length) {
	const x = this.disposables.pop();
	if (x) {
	x.dispose();
	}
	}
	}

	private update() {
	const webview = this.panel.webview;
	this.panel.webview.html = this.getHtmlForWebview(webview);
	}

	private getHtmlForWebview(webview: vscode.Webview) {
	// Local path to css styles and images
	const scriptPathOnDisk = joinPath(this.dataroot, 'welcome.js');
	const stylePath = joinPath(this.dataroot, 'welcome.css');
	const announcePath = vscode.Uri.joinPath(this.dataroot, 'announce.png');
	const gopherPath = joinPath(this.dataroot, 'go-logo-blue.png');
	const goExtension = vscode.extensions.getExtension(extensionId)!;
	const goExtensionVersion = goExtension.packageJSON.version;

	// Uri to load styles and images into webview
	const scriptURI = webview.asWebviewUri(scriptPathOnDisk);
	const stylesURI = webview.asWebviewUri(stylePath);
	const gopherURI = webview.asWebviewUri(gopherPath);
	const announceURI = webview.asWebviewUri(announcePath);

	// Use a nonce to only allow specific scripts to be run
	const nonce = getNonce();

	return `<!DOCTYPE html>
	<html lang="en">
	<head>
	<meta charset="UTF-8">
	<!--
	Use a content security policy to only allow loading images from https or from our extension directory,
	and only allow scripts that have a specific nonce.
	-->
	<meta http-equiv="Content-Security-Policy" content="default-src 'none'; style-src ${webview.cspSource}; img-src ${webview.cspSource} https:; script-src 'nonce-${nonce}';">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<link href="${stylesURI}" rel="stylesheet">
	<title>Go for VS Code</title>
	</head>
	<body>
	<main class="Content">
	<div class="Header">
	<img src="${gopherURI}" alt="Go Logo" class="Header-logo"/>
	<div class="Header-details">
	<h1 class="Header-title">Go for VS Code v${goExtensionVersion}</h1>
	<p>The official Go extension for Visual Studio Code, providing rich language support for Go projects.</p>
	<ul class="Header-links">
	<!--
	Here and elsewhere, we must use a fake anchor for command buttons, to get styling
	consistent with links. We can't fake this using CSS, as it conflicts with theming.
	-->
	<li><a href="#" class="Command" data-command="openDocument" data-document="CHANGELOG.md">Release notes</a></li>
	<li><a href="https://github.com/golang/vscode-go">GitHub</a></li>
	<li><a href="https://stackoverflow.com/questions/tagged/go+visual-studio-code">Questions</a></li>
	<li><a href="https://invite.slack.golangbridge.org/">Slack</a></li>
	</ul>
	</div>
	</div>

	<div class="Announcement">
	<img src="${announceURI}" alt="announce" class="Announcement-image" />
	<p>
	New!
	We are excited to announce a new
	<a href="https://github.com/golang/vscode-go/wiki/features#analyze-vulnerabilities-in-dependencies">code analysis feature</a>
	that surfaces known vulnerabilities in your dependencies.
	<br>
	This vulncheck analyzer is backed by <a href="https://go.dev/security/vulndb">
	Go's vulnerability database</a> and the Go language server's integration of
	<a href="https://golang.org/x/vuln/cmd/govulncheck"><code>govulncheck</code></a>.
	Read <a href="https://go.dev/blog/vuln">"Go's support for vulnerability management"</a>
	to learn about the Go team's approach to helping Go developers secure their open-source dependencies.
	Please share your feedback at
	<a href="https://go.dev/s/vsc-vulncheck-feedback">go.dev/s/vsc-vulncheck-feedback</a>,
	and report a bug in
	<a href="https://github.com/golang/vscode-go/issues/new">our issue tracker</a>.
	</p>
	</div>

	<div class="Cards">
	<div class="Card">
	<div class="Card-inner">
	<p class="Card-title">Getting started</p>
	<p class="Card-content">Learn about the Go extension in our
	<a href="https://github.com/golang/vscode-go/blob/master/README.md">README</a>.
	</p>
	</div>
	</div>

	<div class="Card">
	<div class="Card-inner">
	<p class="Card-title">Learning Go</p>
	<p class="Card-content">If you're new to the Go programming language,
	<a href="https://go.dev/learn">go.dev/learn</a> is a great place to get started.</a>
	</p>
	</div>
	</div>

	<div class="Card">
	<div class="Card-inner">
	<p class="Card-title">Troubleshooting</p>
	<p class="Card-content">Experiencing problems? Start with our
	<a href="https://github.com/golang/vscode-go/blob/master/docs/troubleshooting.md">troubleshooting guide</a>. </p> </div>
	</div>
	</div>
	</main>

	<script nonce="${nonce}" src="${scriptURI}"></script>
	</body>
	</html>`;
	}
	}

	function getNonce() {
	let text = '';
	const possible = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
	for (let i = 0; i < 32; i++) {
	text += possible.charAt(Math.floor(Math.random() * possible.length));
	}
	return text;
	}

	function joinPath(uri: vscode.Uri, ...pathFragment: string[]): vscode.Uri {
	// Reimplementation of
	// https://github.com/microsoft/vscode/blob/b251bd952b84a3bdf68dad0141c37137dac55d64/src/vs/base/common/uri.ts#L346-L357
	// with Node.JS path. This is a temporary workaround for https://github.com/eclipse-theia/theia/issues/8752.
	if (!uri.path) {
	throw new Error('[UriError]: cannot call joinPaths on URI without path');
	}
	return uri.with({ path: vscode.Uri.file(path.join(uri.fsPath, ...pathFragment)).path });
	}

	function showGoWelcomePage() {
	// Update this list of versions when there is a new version where we want to
	// show the welcome page on update.
	const showVersions: string[] = ['0.37.0'];
	// TODO(hyangah): use the content hash instead of hard-coded string.
	// https://github.com/golang/vscode-go/issue/1179
	let goExtensionVersion = '0.37.0';
	let goExtensionVersionKey = 'go.extensionVersion';
	if (extensionInfo.isPreview) {
	goExtensionVersion = '0.0.0';
	goExtensionVersionKey = 'go.nightlyExtensionVersion';
	}

	const savedGoExtensionVersion = getFromGlobalState(goExtensionVersionKey, '');

	if (shouldShowGoWelcomePage(showVersions, goExtensionVersion, savedGoExtensionVersion)) {
	vscode.commands.executeCommand('go.welcome');
	}
	if (goExtensionVersion !== savedGoExtensionVersion) {
	updateGlobalState(goExtensionVersionKey, goExtensionVersion);
	}
	}

	export function shouldShowGoWelcomePage(showVersions: string[], newVersion: string, oldVersion: string): boolean {
	if (newVersion === oldVersion) {
	return false;
	}
	const coercedNew = semver.coerce(newVersion);
	const coercedOld = semver.coerce(oldVersion);
	if (!coercedNew \|\| !coercedOld) {
	return true;
	}
	// Both semver.coerce(0.22.0) and semver.coerce(0.22.0-rc.1) will be 0.22.0.
	return semver.gte(coercedNew, coercedOld) && showVersions.includes(coercedNew.toString());
	}