flutter_icp_auth:

This Flutter package simplifies integrating ICP internet identity authentication flow within your Flutter application.

✨ Features

• LOG IN: Enables users to log in using internet identity.
• AUTO LOGIN: Allows users to log in automatically.
• RELOAD: Automatically logs in users when the app is reloaded or opened, based on session data/delegationObject.
• LOGOUT: Provides functionality for users to log out.

🚀 Getting Started & Usage

1. Setup

• Add the package in pubspec.yaml:

  dependencies:
    flutter_icp_auth: ^1.0.0
  

• Import the package in you main.dart:

  import 'package:flutter_icp_auth/flutter_icp_auth.dart';
  

• Configure Deep Linking in AndroidManifest.XML:

  Open android → app → src → main → AndroidManifest.XML, , add the following snippet, and replace android:scheme and android:host with your app's values:

  <meta-data android:name="flutter_deeplinking_enabled" android:value="true" />
              <intent-filter android:autoVerify="true">
                  <action android:name="android.intent.action.VIEW"/>
                  <category android:name="android.intent.category.DEFAULT"/>
                  <category android:name="android.intent.category.BROWSABLE" />
                  <data android:scheme="your_app_scheme" android:host="your_app_callback" />
                  <data android:scheme="https" />
              </intent-filter>
  

2. Initialization

• Declare your variables:

  bool isLocal =
        false; // To confirm if you running your project locally or using main-net. Change it to true if running locally
  StreamSubscription? _sub;
  late List<Object> delegationObject;
  String canisterId =
        'cni7b-uaaaa-aaaag-qc6ra-cai'; // Replace it with your backend canister id
  Service idlService =
        FieldsMethod.idl;
  

• Define the initState and dispose methods:

  // Add this in the app to check the login state when app is opened
    @override
    void initState() {
      super.initState();
      _checkIfLoggedIn();
      if (isLoggedIn == false) {
        _initUniLinks();
      }
    }
  
    // Add this to cancel the sub and dispose the state
    @override
    void dispose() {
      _sub?.cancel();
      super.dispose();
    } 
  

• Handle incoming deep links:

  Future<void> _initUniLinks() async {
    Future<void> processUri(Uri? uri) async {
      if (uri != null) {
        try {
          delegationObject =
              await IIDLoginState.fetchAgent(uri.queryParameters, isLocal);
          log("Delegation Object: $delegationObject");
          customLoader.showSuccess("Login Successful");
          whoAmI();
        } catch (e) {
          log("fetchAgent Error: $e");
        }
      }
    }
  
    try {
      final initialLink = await getInitialUri();
      await processUri(initialLink);
    } catch (e) {
      log("initialLink Error: $e");
    }
  
    _sub = uriLinkStream.listen(
      (Uri? uri) async {
        await processUri(uri);
      },
      onError: (err) {
        log("uriLinkStream Error: $err");
      },
    );
  }
  

3. Authentication Methods

You can customize these functions based on your app functionality and design requirements. But, call the below functions inside the mentioned functions to get the data.

• _checkIfLoggedIn(): Call the readData() to get the delegationObject after being validated.

  delegationObject = await IIDLoginState.readData();
      isLoggedIn = delegationObject.whereType<bool>().first;
  

• whoAmI(): Call the getActor()/getAllActors() to get the canisterActor created using the HttpAgent

  CanisterActor newActor = IIDLoginState.getActor(canisterId, idlService);
  

4. Using the IIDLogin Button

When passing argument in the IIDLogin button, remember to pass your app:host and app:callback:

IIDLogin(
          text: "Sign In With Internet Identity",
          isComplete: true,
          scheme: "example",
          host: "exampleCallback")

ℹ️ Additional Info:

📄 Example file location: example/lib/login.dart

This package depends on the following dependencies:

• agent_dart: ^1.0.0-dev.22
• fluttertoast: ^8.2.5
• uni_links: ^0.5.1
• flutter_custom_tabs: ^2.0.0+1
• flutter_secure_storage: ^9.0.0

Your app should have the following dependencies:

• uni_links: ^0.5.1
• agent_dart: ^1.0.0-dev.22