feat: CRP-2889 add encrypted chat example

.github/workflows/examples-encrypted-chat.yml

@@ -0,0 +1,38 @@
+name: examples-encrypted-chat
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    paths:
+      - examples/encrypted_chat/**
+      - .github/workflows/provision-darwin.sh
+      - .github/workflows/provision-linux.sh
+      - .github/workflows/examples-encrypted-chat.yml
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+jobs:
+  examples-encrypted-chat-rust-darwin:
+    runs-on: macos-15
+    steps:
+      - uses: actions/checkout@v4
+      - name: Provision Darwin
+        run: |
+          bash .github/workflows/provision-darwin.sh
+      - name: Backend Tests Encrypted Chat Rust Darwin
+        run: |
+          set -eExuo pipefail
+          cd examples/encrypted_chat/rust/backend
+          cargo build --release --target wasm32-unknown-unknown && cargo test
+  examples-encrypted-chat-rust-linux:
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/checkout@v4
+      - name: Provision Linux
+        run: bash .github/workflows/provision-linux.sh
+      - name: Backend Tests Encrypted Chat Rust Linux
+        run: |
+          set -eExuo pipefail
+          cd examples/encrypted_chat/rust/backend
+          cargo build --release --target wasm32-unknown-unknown && cargo test

README.md

@@ -49,3 +49,4 @@ Tools for frontend developers to interact with VetKD enabled canisters.
 - **[Password Manager](examples/password_manager)** - A secure, decentralized password manager using Encrypted Maps for vault-based password storage and sharing.
 - **[Password Manager with Metadata](examples/password_manager_with_metadata)** - Extends the basic password manager to support unencrypted metadata alongside encrypted passwords.
 - **[Encrypted Notes](examples/encrypted_notes_dapp_vetkd)** - A secure note-taking application that uses vetKeys for encryption and enables sharing notes between users without device management.
+- **[Encrypted Chat](examples/encrypted_chat)** - An *unfinished prototype* for an end-to-end encrypted messaging application based on vetKeys.

examples/encrypted_chat/README.md

@@ -0,0 +1,5 @@
+> **Disclaimer**: This example is an *unfinished* prototype for a vetKeys-based encrypted chat app according to the [SPEC.md](./SPEC.md).
+> 
+> DO NOT USE IN PRODUCTION!!
+
+[![](https://icp.ninja/assets/open.svg)](https://icp.ninja/editor?g=https://github.com/dfinity/vetkeys/tree/alex/encrypted-chat/examples/encrypted_chat/rust)

examples/encrypted_chat/frontend/.gitignore

@@ -0,0 +1,24 @@
+test-results
+node_modules
+
+# Output
+.output
+.vercel
+.netlify
+.wrangler
+/.svelte-kit
+/build
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Env
+.env
+.env.*
+!.env.example
+!.env.test
+
+# Vite
+vite.config.js.timestamp-*
+vite.config.ts.timestamp-*

examples/encrypted_chat/frontend/.npmrc

@@ -0,0 +1 @@
+engine-strict=true

examples/encrypted_chat/frontend/.prettierignore

@@ -0,0 +1,9 @@
+# Package Managers
+package-lock.json
+pnpm-lock.yaml
+yarn.lock
+bun.lock
+bun.lockb
+
+# Miscellaneous
+/static/

examples/encrypted_chat/frontend/.prettierrc

@@ -0,0 +1,16 @@
+{
+	"useTabs": true,
+	"singleQuote": true,
+	"trailingComma": "none",
+	"printWidth": 100,
+	"plugins": ["prettier-plugin-svelte", "prettier-plugin-tailwindcss"],
+	"overrides": [
+		{
+			"files": "*.svelte",
+			"options": {
+				"parser": "svelte"
+			}
+		}
+	],
+	"tailwindStylesheet": "./src/app.css"
+}

examples/encrypted_chat/frontend/README.md

@@ -0,0 +1,38 @@
+# sv
+
+Everything you need to build a Svelte project, powered by [`sv`](https://github.com/sveltejs/cli).
+
+## Creating a project
+
+If you're seeing this, you've probably already done this step. Congrats!
+
+```sh
+# create a new project in the current directory
+npx sv create
+
+# create a new project in my-app
+npx sv create my-app
+```
+
+## Developing
+
+Once you've created a project and installed dependencies with `npm install` (or `pnpm install` or `yarn`), start a development server:
+
+```sh
+npm run dev
+
+# or start the server and open the app in a new browser tab
+npm run dev -- --open
+```
+
+## Building
+
+To create a production version of your app:
+
+```sh
+npm run build
+```
+
+You can preview the production build with `npm run preview`.
+
+> To deploy your app, you may need to install an [adapter](https://svelte.dev/docs/kit/adapters) for your target environment.

examples/encrypted_chat/frontend/e2e/demo.test.ts

@@ -0,0 +1,6 @@
+import { expect, test } from '@playwright/test';
+
+test('home page has expected h1', async ({ page }) => {
+	await page.goto('/');
+	await expect(page.locator('h1')).toBeVisible();
+});

examples/encrypted_chat/frontend/eslint.config.js

@@ -0,0 +1,64 @@
+import prettier from 'eslint-config-prettier';
+import { includeIgnoreFile } from '@eslint/compat';
+import js from '@eslint/js';
+import svelte from 'eslint-plugin-svelte';
+import globals from 'globals';
+import { fileURLToPath } from 'node:url';
+import ts from 'typescript-eslint';
+import svelteConfig from './svelte.config.js';
+import path from 'node:path';
+
+const gitignorePath = fileURLToPath(new URL('./.gitignore', import.meta.url));
+
+export default ts.config(
+	includeIgnoreFile(gitignorePath),
+	js.configs.recommended,
+	...ts.configs.recommendedTypeChecked,
+	...svelte.configs.recommended,
+	prettier,
+	...svelte.configs.prettier,
+	{
+		languageOptions: {
+			globals: { ...globals.browser, ...globals.node }
+		},
+		rules: {
+			// typescript-eslint strongly recommend that you do not use the no-undef lint rule on TypeScript projects.
+			// see: https://typescript-eslint.io/troubleshooting/faqs/eslint/#i-get-errors-from-the-no-undef-rule-about-global-variables-not-being-defined-even-though-there-are-no-typescript-errors
+			'no-undef': 'off'
+		}
+	},
+	{
+		files: ['**/*.ts'],
+		languageOptions: {
+			parser: ts.parser,
+			parserOptions: {
+				projectService: true,
+				tsconfigRootDir: import.meta.dirname
+			}
+		}
+	},
+	{
+		files: ['**/*.svelte', '**/*.svelte.ts', '**/*.svelte.js'],
+		languageOptions: {
+			parserOptions: {
+				extraFileExtensions: ['.svelte'],
+				parser: ts.parser,
+				svelteConfig,
+				projectService: true,
+				tsconfigRootDir: import.meta.dirname
+			}
+		}
+	},
+	{
+		ignores: [
+			'dist/',
+			'src/declarations',
+			'*.config.js',
+			'*.config.ts',
+			'*.config.cjs',
+			'*.config.mjs',
+			'.svelte-kit',
+			'e2e/'
+		]
+	}
+);