我无法使用 Flutter 和 OAuth2 进行身份验证。基本上我创建了一个 Flutter 基础项目并添加了 example OAuth2 维基的。
这是来自 Flutter 基础项目的类:
class _MyHomePageState extends State<MyHomePage> {
int _counter = 0;
void _login() async {
final authorizationEndpoint =
Uri.parse("http://blablablabla/o/token");
final username = "username";
final password = "password";
// Something like this
final identifier = "mavEZjJgs9d4JwvvXsANZgN5Dz5GFxzfj616752A";
final secret = "hcAFRwvtGqzhKrMPH2Vqm1vncuZt2YTVfTs6LcdNcnKPdEH3J0T1njIwurryofrvDMnzOvhQDVbaC9Gt5DctciTv3n89s7JSGjpHtzkbEfLpkOT5y6YHN3p6grQlYGd59";
// Make a request to the authorization endpoint that will produce the fully
// authenticated Client.
var client = await oauth2.resourceOwnerPasswordGrant(
authorizationEndpoint, username, password,
identifier: identifier, secret: secret);
// Once you have the client, you can use it just like any other HTTP client.
var result = await client.read("http://blablabla/api/users/me/");
// Once we're done with the client, save the credentials file. This will allow
// us to re-use the credentials and avoid storing the username and password
// directly.
new File("~/.myapp/credentials.json")
.writeAsString(client.credentials.toJson());
}
@override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(
title: new Text(widget.title),
),
body: new Center(
child: new Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
new Text(
'You have pushed the button this many times:',
),
new Text(
'$_counter',
style: Theme.of(context).textTheme.display1,
),
],
),
),
floatingActionButton: new FloatingActionButton(
// onPressed: _incrementCounter,
onPressed: _login,
tooltip: 'Increment',
child: new Icon(Icons.add),
), // This trailing comma makes auto-formatting nicer for build methods.
);
}
}
我把教程的_incrementCounter
方法改成了_login
。当我按下按钮(我现在应该登录)时,我得到以下信息:
E/flutter ( 7662): [ERROR:topaz/lib/tonic/logging/dart_error.cc(16)] Unhandled exception:
E/flutter ( 7662): NoSuchMethodError: No top-level method 'base64Encode' declared.
E/flutter ( 7662): Receiver: top-level
E/flutter ( 7662): Tried calling: base64Encode(Uint8Array)
E/flutter ( 7662): #0 NoSuchMethodError._throwNew (dart:core-patch/dart:core/errors_patch.dart:192)
E/flutter ( 7662): #1 basicAuthHeader (package:oauth2/src/utils.dart:14)
E/flutter ( 7662): #2 resourceOwnerPasswordGrant (package:oauth2/src/resource_owner_password_grant.dart:69)
E/flutter ( 7662): <asynchronous suspension>
E/flutter ( 7662): #3 _MyHomePageState._login (file:///home/thisismyuser/AndroidStudioProjects/login/lib/main.dart:79)
E/flutter ( 7662): <asynchronous suspension>
E/flutter ( 7662): #4 _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:478)
E/flutter ( 7662): #5 _InkResponseState.build.<anonymous closure> (package:flutter/src/material/ink_well.dart:530)
E/flutter ( 7662): #6 GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:102)
E/flutter ( 7662): #7 TapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:161)
E/flutter ( 7662): #8 TapGestureRecognizer.acceptGesture (package:flutter/src/gestures/tap.dart:123)
E/flutter ( 7662): #9 GestureArenaManager.sweep (package:flutter/src/gestures/arena.dart:156)
E/flutter ( 7662): #10 BindingBase&GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:147)
E/flutter ( 7662): #11 BindingBase&GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:121)
E/flutter ( 7662): #12 BindingBase&GestureBinding._handlePointerEvent (package:flutter/src/gestures/binding.dart:101)
E/flutter ( 7662): #13 BindingBase&GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:64)
E/flutter ( 7662): #14 BindingBase&GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:48)
E/flutter ( 7662): #15 _invoke1 (file:///b/build/slave/Linux_Engine/build/src/flutter/lib/ui/hooks.dart:134)
E/flutter ( 7662): #16 _dispatchPointerDataPacket (file:///b/build/slave/Linux_Engine/build/src/flutter/lib/ui/hooks.dart:91)
提前致谢!
(有了 Postman,我得到了这个漂亮的认证)
最佳答案
我的猜测是您使用的是 Dart 1,而 oauth 库依赖于 Dart 2 API(似乎 base64Encode
方法仅在 Dart 2 中添加)。确保你至少使用 Flutter Beta 2,它默认使用 Dart 2。如果您有意使用 Dart 1,那么您似乎必须升级。
您可以通过在终端中调用来确保您运行的是最新的 Flutter beta 版本
flutter channel beta
flutter upgrade
对于此类问题,提供 flutter doctor
的输出也很有用
关于android - Flutter 中的 OAuth2 身份验证,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/50576154/