I want to create a function for auto login like Facebook in flutter but don't know the best way to do it.
My function for login and auto login, I used SharedPreferences plugin for store data.
SignIn function:
Future<void> signIn(String userName, String pass) async {
final url = Uri.parse('MyAPI_login');// sorry it for privacy
debugPrint("$userName / $pass");
try {
var respone = await http.post(url, body: {
'user_name': userName,
'password': pass,
'platform': 'mobile',
'device_token': '',
});
final reponseData = jsonDecode(respone.body);
_userName = userName;
_token = reponseData['data']['accessToken'];
_expiryDate = DateTime.now().add(Duration(
seconds: int.parse(reponseData['data']['tokenExpireAt'].toString())));
_refreshToken = reponseData['data']['refreshToken'].toString();
_timerRefreshToken =
int.parse(reponseData['data']['refreshTokenExpireAt'].toString());
// debugPrint(
// '$_token \n $_expiryDate \n $_refreshToken \n $_timerRefreshToken');
notifyListeners();
final prefs = await SharedPreferences.getInstance();
final userData = json.encode({
'_userId': _userName.toString(),
'token': _token.toString(),
'expiryDate': _expiryDate!.toIso8601String(),
'refreshToken': _refreshToken,
'timerRefreshToken': _timerRefreshToken.toString(),
});
await prefs.setString('userData', userData);
} catch (error) {
throw Exception(error.toString());
}}
TryAutoLogin function:
Future<bool> tryAutoLogin() async {
final prefs = await SharedPreferences.getInstance();
if (!prefs.containsKey('userData')) {
return false;
}
final extractedUserData = json
.decode(prefs.getString('userData').toString()) as Map<String, dynamic>;
final expiryDate =
DateTime.parse(extractedUserData['expiryDate'].toString());
if (expiryDate.isBefore(DateTime.now())) {
_token = extractedUserData['refreshToken'].toString();
_expiryDate = DateTime.now().add(
Duration(seconds: int.parse(extractedUserData['timerRefreshToken'])));
_refreshNewToken(extractedUserData['refreshToken'].toString());
}
return true;}
RefreshNewToken function:
Future<void> _refreshNewToken(String oldRefreshToken) async {
final url =
Uri.parse('MyAPI_refreshtoken');
var respone = await http.post(url, body: {'refreshToken': oldRefreshToken});
debugPrint(respone.body);}
My API for login response is like this:
{"data":{"tokenKey":"Authorization","tokenType":"Bearer","accessToken":"eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJ0b2tlbl9pZCI6ImE1YzkyMTQwLTA3Y2YtMTFlZC1hNDQ2LTYzY2YyNjNiZjllMiIsInVzZXJfaWQiOiJDODAzQ0I3RS1CQTcyLTQ4NjgtQjdEMC05NkRBOUNCREQyMTkiLCJ1c2VyX25hbWUiOiIxMDAyMCIsImZ1bGxfbmFtZSI6IkzDqiBUaOG7iyBMacOqbiIsImlzQWRtaW5pc3RyYXRvciI6MCwidXNlcl9jb21wYW5pZXMiOltdLCJpYXQiOjE2NTgyODIzOTMsImV4cCI6MTY1ODI4NTk5M30.3kMByfweUhzQM-4d5S0G7tUaC0e-nZLJF3_dbdV_7fM","tokenExpireAt":1658285940964,"refreshToken":"eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJ0b2tlbl9pZCI6ImE1YzkyMTQwLTA3Y2YtMTFlZC1hNDQ2LTYzY2YyNjNiZjllMiIsInVzZXJfaWQiOiJDODAzQ0I3RS1CQTcyLTQ4NjgtQjdEMC05NkRBOUNCREQyMTkiLCJ1c2VyX25hbWUiOiIxMDAyMCIsImZ1bGxfbmFtZSI6IkzDqiBUaOG7iyBMacOqbiIsImlzQWRtaW5pc3RyYXRvciI6MCwidXNlcl9jb21wYW5pZXMiOltdLCJpYXQiOjE2NTgyODIzOTMsImV4cCI6MTY1ODM2ODc5M30.Bv7PZrnx9zDzwIuxNMppFxlwZlJEnthVjEYBKYl-aWM","refreshTokenExpireAt":1658368740964},"message":"Logged in successfully!","status":200,"errors":null}
Also, my API has a refresh token request, it returns like this:
{"data":{"tokenKey":"Authorization","tokenType":"Bearer","accessToken":"eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJ0b2tlbl9pZCI6ImE1ZjQyOGUwLTA3Y2YtMTFlZC1hNDQ2LTYzY2YyNjNiZjllMiIsInVzZXJfaWQiOiJDODAzQ0I3RS1CQTcyLTQ4NjgtQjdEMC05NkRBOUNCREQyMTkiLCJ1c2VyX25hbWUiOiIxMDAyMCIsImZ1bGxfbmFtZSI6IkzDqiBUaOG7iyBMacOqbiIsImlzQWRtaW5pc3RyYXRvciI6MCwidXNlcl9jb21wYW5pZXMiOltdLCJpYXQiOjE2NTgyODIzOTQsImV4cCI6MTY1ODI4NTk5NH0.wcyouoprMHFnRD4_oSpP9RSasxMBrktX6nZI2x2PQec","tokenExpireAt":1658285940242,"refreshToken":"eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJ0b2tlbl9pZCI6ImE1ZjQyOGUwLTA3Y2YtMTFlZC1hNDQ2LTYzY2YyNjNiZjllMiIsInVzZXJfaWQiOiJDODAzQ0I3RS1CQTcyLTQ4NjgtQjdEMC05NkRBOUNCREQyMTkiLCJ1c2VyX25hbWUiOiIxMDAyMCIsImZ1bGxfbmFtZSI6IkzDqiBUaOG7iyBMacOqbiIsImlzQWRtaW5pc3RyYXRvciI6MCwidXNlcl9jb21wYW5pZXMiOltdLCJpYXQiOjE2NTgyODIzOTQsImV4cCI6MTY1ODM2ODc5NH0.y-8MP4M_1LzCwmqo_KQZGyQXkycrxdOLWz_fdqIPRyQ","refreshTokenExpireAt":1658368740242},"message":"Request successfully!","status":200,"errors":null}
Related
import 'package:demo_app/services/api.dart';
import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';
class AuthProvider extends ChangeNotifier{
bool isAuthenticated = false;
late String token;
late ApiService apiService;
AuthProvider() {
init();
}
Future<void> init() async {
token = await getToken();
if (token.isNotEmpty) {
isAuthenticated = true;
}
apiService = ApiService(token);
notifyListeners();
}
Future<void> register(String name, String email, String password, String passwordConfirm, String deviceName) async{
token = await apiService.register(name, email, password, passwordConfirm, deviceName);
isAuthenticated = true;
setToken();
notifyListeners();
}
Future<void> logIn(String email, String password, String deviceName) async{
token = await apiService.login(email, password, deviceName);
isAuthenticated = true;
setToken();
notifyListeners();
}
Future<void> logOut() async{
token = '';
isAuthenticated = false;
setToken();
notifyListeners();
}
Future<void> setToken() async{
final pref = await SharedPreferences.getInstance();
pref.setString('token', token);
}
Future<void> getToken() async{
final pref = await SharedPreferences.getInstance();
pref.getString('token') ?? '';
}
}
token = await getToken();
gives this error
This expression has a type of 'void' so its value can't be used.
Try checking to see if you're using the correct API; there might be a function or call that returns void you didn't expect. Also check type parameters and variables which might also be void.
Any clue on solving this issue?
Try the following code:
Future<void> init() async {
token = await getToken();
if (token.isNotEmpty) {
isAuthenticated = true;
}
apiService = ApiService(token);
notifyListeners();
}
Future<String> getToken() async {
final pref = await SharedPreferences.getInstance();
final token = pref.getString("token") ?? "";
return token;
}
How to dynamically auth users and save tokens in shared pref?
I understood how to save token in sharedprefernces, but can't understand how to take it dynamically by login/password and pass token from it to sharedpref dynamically in loginWithToken(); beacuse I use this function for auth in
final httpConnectionOptions = HttpConnectionOptions(
accessTokenFactory: () => SharedPreferenceService().loginWithToken(),
and it is required only String
My code now is like that:
Here is request where I am making request to get token:
Future<String?> getToken(String password, String login) async {
String _email = "admin";
String _password = "123";
Map<String, String> headers = {
'Content-Type': 'application/json',
'accept': ' */*'
};
final body = {
'username': _email,
'password': _password,
};
var response = await http.post(
Uri.parse("http://mylink/login"),
headers: headers,
body: jsonEncode(body),
);
if (response.statusCode == 200) {
var value = jsonEncode(response.body);
return value;
}
return null;
}
here is I created logging logic:
final TextEditingController _loginController = TextEditingController();
final TextEditingController _passwordController = TextEditingController();
ElevatedButton(
onPressed: () async {
var username = _loginController.text;
var password = _passwordController.text;
var jwt = await ProviderService()
.getToken(password, username);
if (jwt != null) {
SharedPreferenceService().setToken(jwt);
Navigator.pushNamed(
context, '/mainPageAdmin');
} else {
displayDialog(context);
}
},
here is my shared pref. I can't understand how to put new token value in that string, after paaword and login was sent.
String tokens = 'dhjwhdwdwkjdhdkje';
Future<bool> getSharedPreferencesInstance() async {
_prefs = await SharedPreferences.getInstance().catchError((e) {
print("shared preferences error : $e");
return false;
});
return true;
}
Future setToken(String token) async {
await _prefs?.setString('token', token);
}
Future clearToken() async {
await _prefs?.clear();
}
Future<String> get token async => _prefs?.getString('token') ?? '';
Future<String> loginWithToken() async {
bool value = await getSharedPreferencesInstance();
if (value == true) {
setToken("Bearer $tokens");
// print(tokens);
}
return tokens;
}
Api Responce:
{
"$id": "1",
"token": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJodHRwOi8vc2NoZW1hcy54bWxzb2FwLm9yZ",
"user": {
"$id": "2"
}
}
Auth class I parsed:
Auth authFromJson(String str) => Auth.fromJson(json.decode(str));
String authToJson(Auth data) => json.encode(data.toJson());
class Auth {
Auth({
this.token,
this.user,
});
final String? token;
final User? user;
factory Auth.fromJson(Map<String, dynamic> json) => Auth(
token: json["token"],
user: User.fromJson(json["user"]),
);
Map<String, dynamic> toJson() => {
"token": token,
"user": user!.toJson(),
};
}
In your getToken function do this:
if (response.statusCode == 200) {
var value = jsonEncode(response.body) as Map<String, dynamic>;
await setToken(value['token']);
return value;
}
I am retrying my api call if get 401 response but when Retrying I am ending with an following exception
following is my code for retrying multipart I had used http_interceptor package for retrying Api Calls
interceptor.dart
class AuthorizationInterceptor extends InterceptorContract {
#override
Future<BaseRequest> interceptRequest({required BaseRequest request}) async {
final prefs = await SharedPreferences.getInstance();
final extractData =
json.decode(prefs.getString('userData')!) as Map<String, dynamic>;
final Map<String, String> headers = Map.from(request.headers);
headers['Authorization'] = await extractData['accessToken'];
print(
'this is from AuthorizationInterceptor: ${extractData['accessToken']}');
// TODO: implement interceptRequest
return request.copyWith(
headers: headers,
);
}
retry.dart
class ExpiredTokenRetryPolicy extends RetryPolicy {
BuildContext context;
ExpiredTokenRetryPolicy(this.context);
#override
// TODO: implement maxRetryAttempts
int get maxRetryAttempts => 2;
#override
Future<bool> shouldAttemptRetryOnResponse(BaseResponse response) async {
if (response.statusCode == 401) {
print('retry token started');
//perform token refresh,get the new token and update it in the secure storage
await Provider.of<Auth>(context, listen: false).restoreAccessToken();
return true;
}
return false;
}
I am using interceptors in my widget following is my code where I am using interceptors and using retry policy
#override
Widget build(BuildContext context) {
var flutterFunctions = Provider.of<FlutterFunctions>(context);
// print('this is from insert package${token.token}');
ApiCalls repository = ApiCalls(
client: InterceptedClient.build(
retryPolicy: ExpiredTokenRetryPolicy(context),
interceptors: [
AuthorizationInterceptor(),
],
),
);
following is my restore access token method
Future<void> restoreAccessToken() async {
print('restoreAccessToken started');
//print(token);
final url = '${Ninecabsapi().urlHost}${Ninecabsapi().login}/$sessionId';
var response = await http.patch(
Uri.parse(url),
headers: {
'Content-Type': 'application/json; charset=UTF-8',
'Authorization': accessToken!
},
body: json.encode(
{"refresh_token": refreshtoken},
),
);
var userDetails = json.decode(response.body);
if (response.statusCode == 401) {
print(userDetails['messages']);
}
sessionId = userDetails['data']['session_id'];
accessToken = userDetails['data']['access_token'];
accessTokenExpiryDate = DateTime.now().add(
Duration(seconds: userDetails['data']['access_token_expiry']),
);
refreshToken = userDetails['data']['refresh_token'];
refreshTokenExpiryDate = DateTime.now().add(
Duration(seconds: userDetails['data']['refresh_token_expiry']),
);
final userData = json.encode({
'sessionId': sessionId,
'refreshToken': refreshToken,
'refreshExpiry': refreshTokenExpiryDate!.toIso8601String(),
'accessToken': accessToken,
'accessTokenExpiry': accessTokenExpiryDate!.toIso8601String()
});
//print(userDetails);
notifyListeners();
final prefs = await SharedPreferences.getInstance();
prefs.setString('userData', userData);
print("this is from restoreAcessToken :$userDetails");
final extractData =
json.decode(prefs.getString('userData')!) as Map<String, dynamic>;
print('restore access token: ${extractData['accessToken']}');
reset();
}
As a rule. You must NOT write using the same Stream/MultipartFile more than once. If you need to retry sending to the same destination, you have to use a new MultipartFile each time you retry.
how to pass the token value from above code to another screen into a http-request as variable.
class AppStarted extends AuthenticationEvent {}
class LoggedIn extends AuthenticationEvent {
final String token;
const LoggedIn({#required this.token});
#override
List<Object> get props => [token];
#override
String toString() => 'LoggedIn { token: $token }';
}
Thank you for your help, haning on this for 2 hours now...
first create a class where your where https request handle & token store
class Network {
var token;
final string base= "/api";
//token get when needed
_getToken() async {
SharedPreferences localStorage = await SharedPreferences.getInstance();
var user = jsonDecode(localStorage.getString('data'));
token = user['token'];
}
//signup
signUp(data, apiUrl) async {
var fullUrl = baseUrl + apiUrl;
return await http.post(fullUrl,
body: jsonEncode(data), headers: _setHeaders());
}
//login
signIn(apiUrl) async {
var fullUrl = baseUrl + apiUrl;
await _getToken();
return await http.get(fullUrl, headers: _setHeaders());
}
}
in sign up page use this method where you use sign up button on pressed
void _signUp() async {
var data = {
'mobile': mobileController.text,
'password': mobileController.text,
};
var res = await Network().signUp(data, '/register');
var body = json.decode(res.body);
if (body.statusCode == 200) {
SharedPreferences localStorage = await SharedPreferences.getInstance();
localStorage.setString('token', json.encode(body['data']['token']));
localStorage.setString('data', json.encode(body['data']));
Navigator.push(
context,
new MaterialPageRoute(builder: (context) => Home()),
);
} else {
// errorMessage = "as you want to show ";
}
}
in sign up page , use this method same as sign up pages
void signIn() async {
var data = {'mobile': mobile, 'password': password};
var res = await Network().signIn(data, '/login');
var body = json.decode(res.body);
if (res.statusCode == 200) {
SharedPreferences localStorage = await SharedPreferences.getInstance();
localStorage.setString('token', json.encode(body['data']['token']));
localStorage.setString('data', json.encode(body['data']));
Navigator.pushReplacement(
context,
new MaterialPageRoute(builder: (context) => HomePage()),
);
} else if (res.statusCode != 200) {
// mobileError = "These credentials do not match our records.";
}
}
now you can have the token when u signup/singIn and store token in sharedSharedPreferences
whenever you try to acces token just called _getToken() method
I have created Login Page, User is able to login, but problem is that after I navigate to New screen userId is not getting passed from Shared preference. If i close and re-open app then userId is passed properly. How Can I manage this properly.
Future loginUser(String email, String password) async {
String url = 'https://androidapp.factory2homes.com/api/login';
final response =
await http.post(url, body: {'email': email, 'password': password});
print(response.body);
var result = jsonDecode(response.body);
return result;
}
onPressed: () async {
var email = emailController.text;
var password = passwordController.text;
setState(() {
message = 'Please wait...';
});
var result = await loginUser(email, password);
if(result ['result']== true ){
SharedPreferences _prefs = await SharedPreferences.getInstance();
_prefs.setInt('userId', result['user']['id']);
_prefs.setString('userName', result['user']['name']);
_prefs.setString('userEmail', result['user']['email']);
Navigator.push(context, MaterialPageRoute(builder: (context)=>HomeScreen()));
} else {
print('incorrect password');
}
},
Add await as setInt & setString both use Future which perform operation asynchronously
await _prefs.setInt('userId', result['user']['id']);
await _prefs.setString('userName', result['user']['name']);
await _prefs.setString('userEmail', result['user']['email']);