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Visa - Easy third party auth for flutter apps.
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‎.gitignore

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# Miscellaneous
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*.class
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*.log
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*.pyc
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*.swp
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.DS_Store
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.atom/
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.buildlog/
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.history
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.svn/
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# IntelliJ related
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*.iml
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*.ipr
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*.iws
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.idea/
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# The .vscode folder contains launch configuration and tasks you configure in
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# VS Code which you may wish to be included in version control, so this line
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# is commented out by default.
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#.vscode/
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# Flutter/Dart/Pub related
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**/doc/api/
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.dart_tool/
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.flutter-plugins
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.flutter-plugins-dependencies
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.packages
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.pub-cache/
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.pub/
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build/
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# Android related
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**/android/**/gradle-wrapper.jar
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**/android/.gradle
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**/android/captures/
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**/android/gradlew
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**/android/gradlew.bat
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**/android/local.properties
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**/android/**/GeneratedPluginRegistrant.java
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# iOS/XCode related
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**/ios/**/*.mode1v3
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**/ios/**/*.mode2v3
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**/ios/**/*.moved-aside
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**/ios/**/*.pbxuser
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**/ios/**/*.perspectivev3
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**/ios/**/*sync/
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**/ios/**/.sconsign.dblite
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**/ios/**/.tags*
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**/ios/**/.vagrant/
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**/ios/**/DerivedData/
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**/ios/**/Icon?
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**/ios/**/Pods/
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**/ios/**/.symlinks/
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**/ios/**/profile
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**/ios/**/xcuserdata
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**/ios/.generated/
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**/ios/Flutter/App.framework
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**/ios/Flutter/Flutter.framework
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**/ios/Flutter/Flutter.podspec
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**/ios/Flutter/Generated.xcconfig
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**/ios/Flutter/app.flx
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**/ios/Flutter/app.zip
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**/ios/Flutter/flutter_assets/
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**/ios/Flutter/flutter_export_environment.sh
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**/ios/ServiceDefinitions.json
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**/ios/Runner/GeneratedPluginRegistrant.*
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# Exceptions to above rules.
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!**/ios/**/default.mode1v3
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!**/ios/**/default.mode2v3
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!**/ios/**/default.pbxuser
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!**/ios/**/default.perspectivev3

‎.metadata

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# This file tracks properties of this Flutter project.
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# Used by Flutter tool to assess capabilities and perform upgrades etc.
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#
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# This file should be version controlled and should not be manually edited.
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version:
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revision: 1aafb3a8b9b0c36241c5f5b34ee914770f015818
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channel: stable
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project_type: package

‎CHANGELOG.md

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## [0.0.1] - TODO: Add release date.
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* TODO: Describe initial release.

‎LICENSE

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TODO: Add your license here.

‎README.md

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# visa
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Easy third party authentication.
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## Getting Started
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This project is a starting point for a Dart
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[package](https://flutter.dev/developing-packages/),
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a library module containing code that can be shared easily across
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multiple Flutter or Dart projects.
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For help getting started with Flutter, view our
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[online documentation](https://flutter.dev/docs), which offers tutorials,
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samples, guidance on mobile development, and a full API reference.

‎lib/auth-data.dart

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import 'engine/oauth.dart';
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class AuthData{
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const AuthData({
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this.clientID, this.accessToken, this.firstName, this.lastName,
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this.userID, this.email, this.profileImgUrl, this.userJson,
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this.response,
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});
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final String userID;
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final String clientID;
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final String accessToken;
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final String firstName;
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final String lastName;
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final String email;
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final String profileImgUrl;
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final Map<String, dynamic> userJson;
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final Map<String, String> response;
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String formatResponse(Map<String, String> response){
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StringBuffer result = StringBuffer('\n');
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for (MapEntry data in response.entries){
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result.write('\t\t\t\t');
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result.write(data.key);
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result.write(' = ');
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result.write(data.value);
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result.write('\n');
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}
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return result.toString();
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}
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@override
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String toString() {
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String responseString = formatResponse(response);
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return 'AuthData {\n\n'
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'\t\ttoken: $accessToken\n\n'
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'\t\tuser id: $userID\n\n'
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'\t\tfirst name: $firstName\n\n'
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'\t\tlast name: $lastName\n\n'
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'\t\temail: $email\n\n'
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'\t\tprofile image: $profileImgUrl\n\n'
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'\t\tresponse: $responseString\n'
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'\t\tuser json: $userJson\n\n'
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'}';
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}
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factory AuthData.fromTwitchJson(
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Map<String, dynamic> json,
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Map<String, String>data
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){
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final String accessToken = data[OAuth.TOKEN_KEY];
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Map<String, dynamic> user = json['data'][0];
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return AuthData(
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clientID: data['clientID'],
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accessToken: accessToken,
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userID: user['id'],
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email: user['email'] as String,
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profileImgUrl: user['profile_image_url'] as String,
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response: data,
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userJson: json
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);
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}
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factory AuthData.fromDiscordJson(
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Map<String, dynamic> json,
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Map<String, String>data
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){
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final String accessToken = data[OAuth.TOKEN_KEY];
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final String userId = json['id'] as String;
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final String avatar = json['avatar'] as String;
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final String profileImgUrl = 'https://cdn.discordapp.com/'
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'avatars/$userId/$avatar.png';
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return AuthData(
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clientID: data['clientID'],
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accessToken: accessToken,
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userID: userId,
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email: json['email'] as String,
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profileImgUrl: profileImgUrl,
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response: data,
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userJson: json
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);
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}
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factory AuthData.fromFbJson(
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Map<String, dynamic> json,
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Map<String, String>data
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){
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final String accessToken = data[OAuth.TOKEN_KEY];
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final String profileImgUrl = 'https://graph.facebook.com/me/picture'
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'?type=large'
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'&access_token=$accessToken';
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return AuthData(
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clientID: data['clientID'],
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accessToken: accessToken,
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userID: json['id'] as String,
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firstName: json['first_name'] as String,
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lastName: json['last_name'] as String,
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email: json['email'] as String,
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profileImgUrl: profileImgUrl,
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response: data,
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userJson: json
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);
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}
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}

‎lib/discord.dart

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import 'dart:convert';
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import 'package:http/http.dart' as http;
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import 'engine/simple-auth.dart';
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import 'engine/visa.dart';
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import 'auth-data.dart';
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import 'engine/oauth.dart';
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class DiscordAuth implements Visa{
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final baseUrl = 'https://discord.com/api/oauth2/authorize';
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SimpleAuth visa;
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DiscordAuth(){
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visa = SimpleAuth(
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baseUrl: baseUrl,
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getAuthData: (Map <String, String> data) async {
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var token = data[OAuth.TOKEN_KEY];
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var baseProfileUrl = 'https://discord.com/api/users/@me';
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var profileResponse = await http.get(baseProfileUrl, headers: {
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'Authorization': 'Bearer $token',
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});
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print(profileResponse);
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var profileJson = Map<String, dynamic>.from(
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json.decode(profileResponse.body)
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);
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return AuthData.fromDiscordJson(profileJson, data);
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}
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);
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}
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}

‎lib/engine/oauth.dart

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import 'dart:collection';
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import 'dart:io';
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import 'package:flutter/material.dart';
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import 'package:webview_flutter/webview_flutter.dart';
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class OAuth{
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const OAuth({
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@required this.baseUrl,
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@required this.clientID,
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@required this.redirectUri,
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@required this.state,
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@required this.scope
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});
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final String baseUrl;
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final String clientID;
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final String redirectUri;
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final String state;
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final String scope;
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static const String TOKEN_KEY = 'access_token';
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WebView authenticate({@required Function onDone}){
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String authUrl = '$baseUrl'
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'?client_id=$clientID'
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'&redirect_uri=$redirectUri'
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'&state=$state'
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'&scope=$scope'
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'&response_type=token';
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if (Platform.isAndroid) WebView.platform = SurfaceAndroidWebView();
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return WebView(
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initialUrl: authUrl,
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javascriptMode: JavascriptMode.unrestricted,
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onPageStarted: (url) async {
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if (url.startsWith(redirectUri)){
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var returnedData = _getQueryParams(url);
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returnedData['clientID'] = clientID;
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onDone(returnedData);
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}
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}
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);
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}
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Map<String, String> _getQueryParams(String url){
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final List<String> urlParams = url.split(RegExp('[?&# ]'));
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final Map<String, String> queryParams = HashMap();
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List<String> parts;
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for(String param in urlParams){
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if (!param.contains('=')) continue;
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parts = param.split('=');
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queryParams[parts[0]] = parts[1];
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}
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return queryParams;
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}
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}
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‎lib/engine/simple-auth.dart

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import 'package:meta/meta.dart';
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import 'package:webview_flutter/webview_flutter.dart';
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import '../auth-data.dart';
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import 'oauth.dart';
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class SimpleAuth{
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const SimpleAuth ({
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@required this.baseUrl, @required this.getAuthData
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});
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final String baseUrl;
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final Function getAuthData;
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WebView authenticate({
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@required String clientID, @required String redirectUri,
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@required String state, @required String scope, @required Function onDone
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}){
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final OAuth oAuth = OAuth(
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baseUrl: baseUrl,
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clientID: clientID,
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redirectUri: redirectUri,
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state: state,
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scope: scope,
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);
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return oAuth.authenticate(onDone: (token) async {
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AuthData authData = await getAuthData(token);
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onDone(authData);
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});
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}
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}

‎lib/engine/visa.dart

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import 'simple-auth.dart';
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abstract class Visa{
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SimpleAuth visa;
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}

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