Add function sample for server-side Remote Config + Vertex AI Gemini API

Node/call-vertex-remote-config-server/README.md

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+Call the Vertex AI Gemini API with Remote Config and App Check
+==============================================================
+
+Introduction
+------------
+
+This is a sample callable function that authenticates clients with App
+Check and then sends queries to Gemini using the Vertex AI Gemini API. Vertex
+AI model parameters (including the model itself) are controlled by
+Remote Config server features included in the Firebase Admin SDK for
+Node.js.
+
+Use the web client provided in `client/` to test the function.
+
+- [Read more about Remote Config for servers](https://firebase.google.com/docs/remote-config/server).
+- [Read more about App Check](https://firebase.google.com/docs/app-check).
+- [Read more about the Vertex AI Node.js Client library](https://cloud.google.com/nodejs/docs/reference/aiplatform/latest).
+
+Important:  Vertex AI and Cloud Functions require a billing account. Review
+[Vertex AI pricing](https://cloud.google.com/vertex-ai/pricing) and
+[Firebase pricing](https://firebase.google.com/pricing) before running
+this function. If you're new to Firebase and Google Cloud, check to see if
+you're eligible for a
+[$300 credit](https://firebase.google.com/support/faq#pricing-free-trial) and
+a Free Trial Cloud Billing account.
+
+Get Started
+---------------
+
+ 1. Follow the instructions in client/README.md to create a Firebase project,
+    enable ReCAPTCHA Enterprise, enable and enforce Firebase App Check, and add
+    your Firebase config and ReCAPTCHA Enterprise key to the client config.
+
+ 2. Enable [recommended Vertex AI APIs](https://console.cloud.google.com/vertex-ai).
+
+ 3. Configure a Remote Config server template on the Firebase console. Use the template
+    described in
+    [Use server side Remote Config with Cloud Functions and Vertex
+    AI](https://firebase.google.com/docs/remote-config/solution-server#implementation-create-template),
+    which contains all of the parameters used in this function sample.
+
+ 4. Install dependencies: `cd functions && npm install`
+
+ 5. If you haven't already done so, install firebase-tools:
+
+    `npm i firebase-tools@latest`
+
+ 6. Log into Firebase:
+
+    `firebase login`
+
+ 7. Deploy the function. We recommend testing in the
+    [Firebase emulator](https://firebase.google.com/docs/remote-config/solution-server#implementation-deploy-and-test-in-emulator):
+
+    `firebase emulators:start`
+
+ 8. If testing in the emulator, verify that `testMode` is set to `true` in
+     `client/main.ts`, then start the client:
+
+    `cd client && npm run dev`
+
+    TIP: If you're using the emulator, you can deploy both the function and hosting
+         to the emulator. From the `client` directory, run `npm run build`.
+         Then, from the parent directory, run `firebase server --only functions,hosting`.
+         Open http://localhost:5000 to access and test the web client's connection
+         to the `callVertexWithRC` function.
+
+ 0. Open the [client app in a browser](http://localhost:5173) and enter a
+    prompt. To access the Vertex AI Gemini API, make sure that you have
+    set the `is_vertex_enabled` boolean parameter in your Remote Config
+    server template to `true`.
+
+Support
+-------
+
+- [Firebase Support](https://firebase.google.com/support/)
+
+License
+-------
+
+© Google, 2024. Licensed under an [Apache-2](../../LICENSE) license.

Node/call-vertex-remote-config-server/client/README.md

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+Test client for call-vertex-remote-config-server
+================================================
+
+Introduction
+------------
+
+This is a basic web app that calls the `callVertexWithRC` function. The
+function uses values stored in Remote Config server templates with
+the Firebase Admin SDK to dynamically update Vertex AI Gemini API
+parameters. Access is controlled using Firebase App Check.
+
+- [Read more about Remote Config for servers](https://firebase.google.com/docs/remote-config/server).
+- [Read more about App Check](https://firebase.google.com/docs/app-check).
+- [Read more about the Vertex AI Node.js Client library](https://cloud.google.com/nodejs/docs/reference/aiplatform/latest).
+
+Important:  Vertex AI and Cloud Functions require a billing account. Review
+[Vertex AI pricing](https://cloud.google.com/vertex-ai/pricing) and
+[Firebase pricing](https://firebase.google.com/pricing) before running
+this function. If you're new to Firebase and Google Cloud, check to see if
+you're eligible for a
+[$300 credit](https://firebase.google.com/support/faq#pricing-free-trial) and
+a Free Trial Cloud Billing account.
+
+Get started
+---------------
+
+ 1. Create a [Firebase project and register a web app](https://firebase.google.com/docs/web/setup#create-firebase-project-and-app).
+ 2. [Create a ReCAPTCHA Enterprise key](https://firebase.google.com/docs/app-check/web/recaptcha-enterprise-provider#project-setup)
+    in the same project.
+ 3. [Enable App Check](https://firebase.google.com/docs/app-check/web/recaptcha-enterprise-provider)
+    in the Firebase console with the ReCAPTCHA Enterprise site key you created.
+ 4. Copy your Firebase project config and your ReCAPTCHA Enterprise site key
+    into the appropriate places in `config.ts` in this directory.
+ 5. In this directory, run `npm install`.
+ 6. Set up and deploy the function as described in [../README.md](../README.md).
+ 7. In this directory, run `npm run dev` to run the client.
+
+To run this app against the `callVertexWithRC` function running in the Firebase
+emulator, ensure that `testMode`in `main.ts` is set to `true`. Before testing
+with a deployed (i.e., not emulated) function, set `testMode` to `false`.
+
+TIP: You can build the client and deploy to Firebase Hosting by running
+     `npm run build` from the `client` directory. Hosting deliverables are
+     generated and saved in `client/dist` and you can then deploy to
+     the emulator or Firebase Hosting from the parent directory. We recommend
+     deploying to the emulator first--you can use the following command to
+     deploy the function and web client simultaneously:
+
+     firebase serve --only functions,hosting 
+
+Support
+-------
+
+- [Firebase Support](https://firebase.google.com/support/)
+
+License
+-------
+
+© Google, 2024. Licensed under an [Apache-2](../../../LICENSE) license.

Node/call-vertex-remote-config-server/client/config.ts

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+export const firebaseConfig = {
+  YOUR_FIREBASE_CONFIG
+};
+
+  // Your ReCAPTCHA Enterprise site key (must be from the same project
+  // as the Firebase config above).
+export const RECAPTCHA_ENTERPRISE_SITE_KEY =
+  "YOUR_RECAPTCHA_KEY";

Node/call-vertex-remote-config-server/client/index.html

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+<!DOCTYPE html>
+<html lang="en">
+
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>Client app for Remote Config server function with Vertex AI and App Check</title>
+  <style>
+    body {
+      font-family: Arial, sans-serif;
+      background-color: #f2f2f2;
+      justify-content: center;
+      align-items: center;
+      height: 100vh;
+      margin: 70px;
+    }
+
+    h1 {
+      margin-bottom: 20px;
+    }
+
+    .container {
+      background-color: #ffffff;
+      border-radius: 8px;
+      box-shadow: 0px 0px 10px rgba(0, 0, 0, 0.1);
+      padding: 20px;
+      max-width: 400px;
+      width: 100%;
+      text-align: center;
+    }
+
+    input[type="text"],
+    input[type="submit"] {
+      width: 35%;
+      padding: 10px;
+      margin-bottom: 10px;
+      border: 1px solid #ccc;
+      border-radius: 4px;
+      box-sizing: border-box;
+    }
+
+    input[type="submit"] {
+      background-color: #FFA500;
+      color: white;
+      border: none;
+      cursor: pointer;
+      font-size: 16px;
+      font-weight: bold;
+    }
+
+    input[type="submit"]:hover {
+      background-color: #45a049;
+    }
+
+    #waitingMessage,
+    #generatedText,
+    #errorMessage {
+      margin-top: 20px;
+      text-align: left;
+    }
+  </style>
+</head>
+
+<body>
+  <div>
+    <h1>Client app for Remote Config server function with Vertex AI and App Check</h1>
+    <br />
+  </div>
+  <script type="module" src="main.ts"></script>
+</body>
+
+</html>

Node/call-vertex-remote-config-server/client/main.ts

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+/**
+ * @license
+ * Copyright 2024 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { initializeApp } from "firebase/app";
+import { firebaseConfig, RECAPTCHA_ENTERPRISE_SITE_KEY } from "./config";
+import {
+  initializeAppCheck,
+  ReCaptchaEnterpriseProvider,
+} from "firebase/app-check";
+import {
+  getFunctions,
+  httpsCallable,
+  connectFunctionsEmulator,
+} from "firebase/functions";
+
+// Set to true to test in emulator.
+const testMode = true;
+
+// Use showdown to convert Gemini-provided Markdown to HTML
+import { Converter } from "showdown";
+const converter = new Converter();
+
+// Set up output elements.
+const outputDiv = document.createElement("div");
+document.body.appendChild(outputDiv);
+
+// Initialize Firebase app.
+const app = initializeApp(firebaseConfig);
+
+// Initialize App Check.
+initializeAppCheck(app, {
+  provider: new ReCaptchaEnterpriseProvider(RECAPTCHA_ENTERPRISE_SITE_KEY),
+});
+
+// Define callVertexWithRC as a call to the callVertexWithRC function.
+const callVertexWithRC = httpsCallable(getFunctions(), "callVertexWithRC", {
+  limitedUseAppCheckTokens: true,
+});
+
+// Enable emulator so that it can be used in test mode.
+const functions = getFunctions(app, "us-central1"); // Replace with your region
+
+if (testMode) {
+  connectFunctionsEmulator(functions, "localhost", 5001);
+}
+
+// Generate body for index.html.
+document.body.innerHTML += `
+
+    <div id="waitingMessage"></div>
+    <div id="generatedText"></div>
+    <div id="errorMessage"></div>
+    <br/>
+    <form id="promptForm">
+        <label for="promptInput">Ask Gemini a question!</label><br>
+        <input type="text" id="promptInput" name="prompt"><br><br>
+        <input type="submit" value="Submit">
+    </form>
+`;
+
+const promptForm = document.getElementById("promptForm") as HTMLFormElement;
+
+promptForm.addEventListener("submit", async (event) => {
+  event.preventDefault();
+  const promptInput = document.getElementById(
+    "promptInput"
+  ) as HTMLInputElement;
+  const prompt = promptInput.value;
+
+  const waitingMessageElement = document.getElementById("waitingMessage");
+
+  // Define a variable to keep track of the number of dots
+  let dotCount = 0;
+
+  // Set interval to add dots every second
+  const intervalId = setInterval(() => {
+    // Increment dotCount
+    dotCount = (dotCount + 1) % 7;
+    const dots = ".".repeat(dotCount);
+    waitingMessageElement.textContent = "Waiting for response" + dots;
+   }, 1000);
+
+  const errorMessageElement = document.getElementById("errorMessage");
+  errorMessageElement.textContent = "";
+
+  try {
+    const { data } = await callVertexWithRC({ prompt });
+    const generatedTextElement = document.getElementById("generatedText"); // Access the element
+    const htmlContent = converter.makeHtml(data);
+    if (!generatedTextElement) {
+      throw new Error("Missing generated text.");
+    }
+    generatedTextElement.innerHTML = htmlContent; // Set the element's content
+    waitingMessageElement.textContent = "";
+    errorMessageElement.textContent = "";
+
+  } catch (error) {
+    errorMessageElement.textContent = "Error calling function: " + error.message;
+    waitingMessageElement.textContent = "";
+  }
+  // Clear welcome dots.
+  clearInterval(intervalId);
+});

Node/call-vertex-remote-config-server/client/package.json

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+{
+  "name": "call-vertex-remote-config-server-client",
+  "version": "1.0.0",
+  "description": "JavaScript quickstart for Vertex AI, Firebase Remote Config server, and App Check.",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/firebase/functions-samples.git"
+  },
+  "author": "",
+  "license": "Apache-2.0",
+  "bugs": {
+    "url": "https://github.com/firebase/functions-samples/issues"
+  },
+  "engines": {
+    "npm": ">=9.0.0 <10.0.0",
+    "node": ">=18.0.0 <=20.0.0"
+  },
+  "homepage": "https://github.com/firebase/functions-samples#readme",
+  "devDependencies": {
+    "typescript": "^5.1.6",
+    "vite": "^4.4.9"
+  },
+  "scripts": {
+    "dev": "vite",
+    "build": "vite build",
+    "format": "prettier --write ."
+  },
+  "dependencies": {
+    "@firebase/functions": "^0.11.5",
+    "firebase": "^10.12.1",
+    "showdown": "^2.1.0"
+  }
+}

Node/call-vertex-remote-config-server/client/vite-env.d.ts

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+/// <reference types="vite/client" />

Node/call-vertex-remote-config-server/client/vite.config.js

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+import { defineConfig } from 'vite';
+
+export default defineConfig({
+  base: '',
+  build: {
+    rollupOptions: {
+      input: ['index.html','main.ts'],
+    },
+  },
+  logLevel: 'info',
+});