DoctorJohn / dart_firebase_admin

🔥 A Firebase Admin SDK for Dart. (WIP)

Dart Firebase Admin

Welcome! This project is a port of Node's Fireabse Admin SDK to Dart.

⚠️ This project is still in its early stages, and some features may be missing or bugged. Currently, only Firestore is available, with more to come (auth next).

• Dart Firebase Admin
• Usage
  • Connecting to the SDK
    • Connecting using the environment
    • Connecting using a service-account.json file
  • Using Firestore

Usage

Connecting to the SDK

Before using Firebase, we must first authenticate.

There are currently two options:

• You can connect using environment variables
• Alternatively, you can specify a service-account.json file

Connecting using the environment

To connect using environment variables, you will need to have the Firebase CLI installed.

Once done, you can run:

firebase login

And log-in to the project of your choice.

From there, you can have your Dart program authenticate using the environment with:

import 'package:dart_firebase_admin/dart_firebase_admin.dart';

void main() {
  final admin = FirebaseAdminApp.initializeApp(
    '<your project name>',
    // This will obtain authentication informations from the environment
    Credential.fromApplicationDefaultCredentials(),
  );

  // TODO use the Admin SDK
  final firestore = Firestore(admin);
  firestore.doc('hello/world').get();
}

Connecting using a service-account.json file

Alternatively, you can choose to use a service-account.json file.
This file can be obtained in your firebase console by going to:

https://console.firebase.google.com/u/0/project/<your-project-name>/settings/serviceaccounts/adminsdk

Make sure to replace <your-project-name> with the name of your project. One there, follow the steps and download the file. Place it anywhere you want in your project.

⚠️ Note: This file should be kept private. Do not commit it on public repositories.

After all of that is done, you can now authenticate in your Dart program using:

import 'package:dart_firebase_admin/dart_firebase_admin.dart';

void main() {
  final admin = FirebaseAdminApp.initializeApp(
    '<your project name>',
    // Log-in using the newly downloaded file.
    Credential.fromServiceAccount(
      File('<path to your service-account.json file>'),
    ),
  );

  // TODO use the Admin SDK
  final firestore = Firestore(admin);
  firestore.doc('hello/world').get();
}

Using Firestore

First, make sure to follow the steps on how to authenticate. You should now have an instance of a FirebaseAdminApp object.

You can now use this object to create a Firestore object as followed:

// Obtained in the previous steps
FirebaseAdminApp admin;
final firestore = Firestore(admin);

From this point onwards, using Firestore with the admin ADK is roughtly equivalent to using FlutterFire.

Using this Firestore object, you'll find your usual collection/query/document objects.

For example you can perform a where query:

// The following lists all users above 18 years old
final collection = firestore.collection('users');
final adults = collection.where('age', WhereFilter.greaterThan, 18);

final adultsSnapshot = await adults.get();

for (final adult in adultsSnapshot.docs) {
  print(adult.data()['age']);
}

Composite queries are also supported:

// List users with either John or Jack as first name.
firestore
  .collection('users')
  .whereFilter(
    Filter.or([
      Filter.where('firstName', WhereFilter.equal, 'John'),
      Filter.where('firstName', WhereFilter.equal, 'Jack'),
    ]),
  );

Alternatively, you can fetch a specific document too:

// Print the age of the user with ID "123"
final user = await firestore.doc('users/123').get();
print(user.data()?['age']);

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