Firebase auth

[m00racle]

Implement Firebase auth

• [x] Review React Context API
• Build an expense tracker on YouTube
• Review Expense Tracker Firebase
• [x] Setting the firebase/auth
• [x] Find out each code logic and read the documentation from Chat GPT
• [x] IMPLEMENT Context Provider to the _apps.js
• [x] implement React Firebase UI
• GitHub firebase/firebaseui-web-react
• Focus on StyledFirebaseAuth
• Review expense tracker index.js
• [x] test if the localhost managed to be detected when run the firebase auth
• [x] verify that it is running on emulators
• [x] make boundary only authenticated user can access beyond index.js
• [x] OPTIONAL: develop test to validate only authenticated users can open dashboard.

[m00racle]

PROBLEM: export inside if statement

I can't export the variables inside this if statement: if (location.hostname === 'localhost' || location.hostname === '127.0.0.1') {

[m00racle]

In JavaScript, you can use export const inside an if statement as long as the if statement itself is within a module context.

In ECMAScript modules (ES modules), which are supported in modern JavaScript environments and used by tools like Node.js and bundlers like Webpack, module code is evaluated in a separate module scope. This allows you to use export statements to export variables, functions, or constants from the module.

Here's an example:

if (condition) {
  export const myVariable = 'Hello';
}

// Exported variables can be accessed from other modules

In this example, if the condition is true, the myVariable constant is declared and exported from the module. It can then be imported and used in other modules that import this module.

However, it's important to note that the export statement must be at the top level of the module scope and cannot be nested inside a function or block scope other than the module scope. This is a requirement of the ECMAScript module syntax.

If you are not using ES modules and instead relying on CommonJS modules or older module systems, the export statement inside an if statement will likely cause a syntax error. In such cases, consider restructuring your code to ensure that export statements are in the module's top-level scope.

[m00racle]

The issue with the code is that you're using export statements inside an if statement, which is not allowed in JavaScript. Export statements must be placed at the top level of a module and cannot be conditionally exported.

To resolve this, you can restructure your code to export the necessary variables at the top level of the module, and then conditionally initialize them based on the hostname condition. Here's an updated version of your code:

import { initializeApp } from "firebase/app";
import { getAuth, connectAuthEmulator } from 'firebase/auth';
import { getStorage, connectStorageEmulator } from 'firebase/storage';
import { getFirestore, connectFirestoreEmulator } from 'firebase/firestore';

const firebaseConfig = {
  apiKey: process.env.NEXT_PUBLIC_FIREBASE_API_KEY,
  authDomain: process.env.NEXT_PUBLIC_FIREBASE_AUTH_DOMAIN,
  projectId: process.env.NEXT_PUBLIC_FIREBASE_PROJECT_ID,
  storageBucket: process.env.NEXT_PUBLIC_FIREBASE_STORAGE_BUCKET,
  messagingSenderId: process.env.NEXT_PUBLIC_FIREBASE_MESSAGING_SENDER_ID,
  appId: process.env.NEXT_PUBLIC_FIREBASE_APP_ID,
  measurementId: process.env.NEXT_PUBLIC_FIREBASE_MEASUREMENT_ID
};

// Initialize Firebase
export const app = initializeApp(firebaseConfig);
export const auth = getAuth(app);
export const db = getFirestore(app);
export const storage = getStorage(app);

// Check if running on localhost
if (location.hostname === 'localhost' || location.hostname === '127.0.0.1') {
  console.log("localhost detected, initializing emulators");

  // Initialize auth emulator
  connectAuthEmulator(auth, "http://127.0.0.1:9099");

  // Initialize firestore emulator
  connectFirestoreEmulator(db, '127.0.0.1', 8080);

  // Initialize storage emulator
  connectStorageEmulator(storage, "127.0.0.1", 9199);
}

In this updated code, the export statements for app, auth, db, and storage are placed at the top level of the module. The condition for running on localhost is checked separately after the exports. Inside the conditional block, the emulators are initialized using the respective connect...Emulator functions.

By structuring the code this way, you ensure that the exports are always available at the top level, and the conditional initialization of emulators is performed separately.

Yes, the provided code ensures that the Firebase emulators will be used instead of the real Firebase services when you run your Next.js page from localhost:3000.

The code first initializes the Firebase app using the initializeApp function with the firebaseConfig object. Then, it exports the app, auth, db, and storage instances obtained from the initialized Firebase app.

After that, it checks if the page is being accessed from localhost or 127.0.0.1 using location.hostname. If the condition is true, indicating that you are running the app locally, the code proceeds to initialize the Firebase emulators for authentication, Firestore, and storage using the respective connect...Emulator functions.

By using the emulators, any authentication, Firestore, or storage operations performed while running the app locally will interact with the emulator instances instead of the real Firebase services. This allows you to test and develop your application using a local environment without affecting the real Firebase resources.

However, please ensure that you have the Firebase emulators running and properly configured on your local machine to match the emulator URLs specified in the code (http://127.0.0.1:9099 for auth, 127.0.0.1:8080 for Firestore, and 127.0.0.1:9199 for storage).

[m00racle]

VERIFY: getAuth() docs

Give me getAuth() in docs

[m00racle]

Sure! Here's some documentation on the getAuth function from the Firebase Auth SDK:

getAuth(app?: FirebaseApp): Auth

The getAuth function is used to obtain an instance of the Auth service from the Firebase Auth SDK. It allows you to interact with Firebase Authentication in your JavaScript or TypeScript code.

Parameters

• app (optional): An instance of the FirebaseApp object representing the Firebase App to which the Auth service belongs. If not provided, the default app is used.

Return Value

• An instance of the Auth service associated with the provided FirebaseApp.

Example Usage

import { getAuth } from 'firebase/auth';

// Get the default Auth service instance
const auth = getAuth();

// Use the auth instance for authentication operations
auth.createUserWithEmailAndPassword(email, password)
  .then((userCredential) => {
    // Handle successful user creation
  })
  .catch((error) => {
    // Handle error
  });

In this example, the getAuth function is imported from the firebase/auth module. It is then used to obtain the default Auth service instance by calling getAuth(). You can use the returned auth object to perform authentication operations such as user creation, signing in, signing out, and more.

Additional Information

• The getAuth function is part of the Firebase Authentication SDK and requires the Firebase Auth package to be installed in your project.

• The Auth service obtained through getAuth provides a set of methods and functionalities for user authentication, including email/password authentication, social sign-in with providers like Google or Facebook, token-based authentication, and more. You can refer to the Firebase Authentication documentation for more details on how to use the Auth service and its methods.

• When using multiple Firebase apps in your project, you can pass the specific FirebaseApp instance to getAuth to get the Auth service associated with that app. This allows you to work with multiple Firebase Authentication instances within the same project.

• Remember to handle any errors that may occur when using the Auth service's methods by using appropriate error handling techniques like try/catch or .catch().

That's a brief overview of the getAuth function from the Firebase Auth SDK. I hope this documentation helps!

[m00racle]

PROBLEM: next.js does not know location.hostname:

The npm run dev invoke error because Next.js does not know what is location or window.location objects to check if hostname is localhost or not:

[m00racle]

In Next.js, during server-side rendering (SSR), the code is executed on the server and not in the user's browser. Therefore, it does not have direct access to the client-side information such as the hostname or the client's environment.

To distinguish whether the code is running in localhost or dev mode during server-side rendering, you can use different approaches:

1. Use a custom environment variable: You can define a custom environment variable in your Next.js project, such as ENV_MODE, and set its value to development for the local development environment. Then, you can access this environment variable in your code to conditionally configure Firebase based on the environment.

2. Use a separate configuration file: Create separate configuration files for different environments, such as firebaseConfig.dev.js and firebaseConfig.prod.js, each containing the appropriate Firebase configuration settings. Then, import the correct configuration file based on the environment in your firebase/firebase.js file.

Here's an example of the second approach:

Create a firebaseConfig.dev.js file:

export default {
  apiKey: 'YOUR_API_KEY',
  authDomain: 'YOUR_AUTH_DOMAIN',
  // ... other Firebase configuration properties
};

Create a firebaseConfig.prod.js file:

export default {
  apiKey: 'YOUR_API_KEY_PROD',
  authDomain: 'YOUR_AUTH_DOMAIN_PROD',
  // ... other Firebase configuration properties for production
};

Modify your firebase/firebase.js file:

import { initializeApp } from 'firebase/app';
import { getAuth, connectAuthEmulator } from 'firebase/auth';
import { getStorage, connectStorageEmulator } from 'firebase/storage';
import { getFirestore, connectFirestoreEmulator } from 'firebase/firestore';

let firebaseConfig;

if (process.env.NODE_ENV === 'development') {
  firebaseConfig = require('./firebaseConfig.dev').default;
} else {
  firebaseConfig = require('./firebaseConfig.prod').default;
}

// Initialize Firebase
export const app = initializeApp(firebaseConfig);
export const auth = getAuth(app);
export const db = getFirestore(app);
export const storage = getStorage(app);

if (process.env.NODE_ENV === 'development') {
  // Initialize auth emulator
  connectAuthEmulator(auth, 'http://localhost:9099');

  // Initialize firestore emulator
  connectFirestoreEmulator(db, 'localhost', 8080);

  // Initialize storage emulator
  connectStorageEmulator(storage, 'localhost', 9199);
}

In this example, we import the appropriate Firebase configuration file based on the environment. During server-side rendering, process.env.NODE_ENV will indicate the environment, and you can conditionally import the correct configuration.

Make sure to update the YOUR_API_KEY and other placeholder values with your actual Firebase configuration values.

By using either of these approaches, you can configure Firebase based on the environment, including distinguishing between localhost and production environments in your Next.js application.

[m00racle]

Yes, that's correct. By setting NEXT_PUBLIC_FIREBASE_EMULATOR=true in your .env.local file, you can ensure that the Firebase SDK is configured to use the emulators during local development. This allows you to test and interact with the Firebase emulators while running your Next.js application in the localhost environment.

When you're ready to deploy your application to Firebase Hosting or any other hosting platform, you can set NEXT_PUBLIC_FIREBASE_EMULATOR=false in the production environment. This ensures that the Firebase SDK connects to the actual Firebase services instead of the emulators.

By utilizing environment variables, you can easily switch between the emulator and production modes without modifying your code. It provides flexibility and allows you to seamlessly transition between development and production environments.

[m00racle]

SOLUTION: choose running on emulator on Next.js

This is the only thing you can do to determine to run emulator or not. You need to manually set the env variable on which emulator or firebase production server to use.

[m00racle]

To run Firebase on the emulator when running a Next.js application in localhost or 127.0.0.1, you can use Next.js environment variables to conditionally set the Firebase configuration based on the environment.

First, make sure you have the Firebase emulator suite installed and running locally.

Next, you can update your firebase/firebase.js file to conditionally configure Firebase based on the environment. Here's an example of how you can modify the code:

import { initializeApp } from 'firebase/app';
import { getAuth, connectAuthEmulator } from 'firebase/auth';
import { getStorage, connectStorageEmulator } from 'firebase/storage';
import { getFirestore, connectFirestoreEmulator } from 'firebase/firestore';

const firebaseConfig = {
  apiKey: process.env.NEXT_PUBLIC_FIREBASE_API_KEY,
  authDomain: process.env.NEXT_PUBLIC_FIREBASE_AUTH_DOMAIN,
  projectId: process.env.NEXT_PUBLIC_FIREBASE_PROJECT_ID,
  storageBucket: process.env.NEXT_PUBLIC_FIREBASE_STORAGE_BUCKET,
  messagingSenderId: process.env.NEXT_PUBLIC_FIREBASE_MESSAGING_SENDER_ID,
  appId: process.env.NEXT_PUBLIC_FIREBASE_APP_ID,
  measurementId: process.env.NEXT_PUBLIC_FIREBASE_MEASUREMENT_ID,
};

// Initialize Firebase
export const app = initializeApp(firebaseConfig);
export const auth = getAuth(app);
export const db = getFirestore(app);
export const storage = getStorage(app);

if (process.env.NEXT_PUBLIC_FIREBASE_EMULATOR === 'true') {
  // Initialize auth emulator
  connectAuthEmulator(auth, 'http://localhost:9099');

  // Initialize firestore emulator
  connectFirestoreEmulator(db, 'localhost', 8080);

  // Initialize storage emulator
  connectStorageEmulator(storage, 'localhost', 9199);
}

In this code, we're using Next.js environment variables to set the Firebase configuration values based on the environment. You need to define these environment variables in your Next.js application.

• NEXT_PUBLIC_FIREBASE_API_KEY, NEXT_PUBLIC_FIREBASE_AUTH_DOMAIN, etc. are environment variables containing the respective Firebase configuration values.
• NEXT_PUBLIC_FIREBASE_EMULATOR is an environment variable that indicates whether you're running in the localhost environment. You should set this variable to true when running locally for development purposes.

By conditionally checking the value of NEXT_PUBLIC_FIREBASE_EMULATOR, we determine whether to connect to the Firebase emulators or use the production Firebase services.

Remember to define the environment variables in a .env.local file at the root of your Next.js project:

NEXT_PUBLIC_FIREBASE_API_KEY=your_api_key
NEXT_PUBLIC_FIREBASE_AUTH_DOMAIN=your_auth_domain
NEXT_PUBLIC_FIREBASE_PROJECT_ID=your_project_id
NEXT_PUBLIC_FIREBASE_STORAGE_BUCKET=your_storage_bucket
NEXT_PUBLIC_FIREBASE_MESSAGING_SENDER_ID=your_messaging_sender_id
NEXT_PUBLIC_FIREBASE_APP_ID=your_app_id
NEXT_PUBLIC_FIREBASE_MEASUREMENT_ID=your_measurement_id
NEXT_PUBLIC_FIREBASE_EMULATOR=true

Replace the values with your actual Firebase project configuration.

When you run your Next.js application in localhost or 127.0.0.1, the Firebase SDK will be configured to use the emulators based on the value of the NEXT_PUBLIC_FIREBASE_EMULATOR environment variable.

Make sure to restart your Next.js development server after adding or modifying environment variables.