I am trying to use Getx service.
here is my api client class as am trying to get data from internet using getx
import 'package:flutter_application_shop/utilis/app_constance.dart';
import 'package:get/get.dart';
class ApiClient extends GetConnect implements GetxService {
late String token;
final String appBaseUrl;
late Map<String, String> _mainHeaders;
ApiClient({required this.appBaseUrl}) {
baseUrl = appBaseUrl;
timeout = const Duration(seconds: 30);
token = AppConstance.TOKEN;
_mainHeaders = {
'Content-type': 'application/json; charset=UTF-8',
'Authorization': 'Bearer $token',
};
}
Future<Response> getData(String url) async {
try {
Response response = await get(url);
return response;
} catch (e) {
return Response(statusCode: 1, statusText: e.toString());
}
}
///end
}
and when I run debug, I get this error.
I/flutter ( 6967): HandshakeException: Handshake error in client (OS Error:
I/flutter ( 6967): CERTIFICATE_VERIFY_FAILED: unable to get local issuer certificate(handshake.cc:393))
How can I solve this?
This is because the request is coming from an untrusted source, in order to bypass the error, Add allowAutoSignedCert = true; to your request in the class that extends GetConnet.
Example:
import 'package:flutter_application_shop/utilis/app_constance.dart';
import 'package:get/get.dart';
class ApiClient extends GetConnect implements GetxService {
late String token;
final String appBaseUrl;
late Map<String, String> _mainHeaders;
ApiClient({required this.appBaseUrl}) {
baseUrl = appBaseUrl;
timeout = const Duration(seconds: 30);
token = AppConstance.TOKEN;
allowAutoSignedCert = true; // the solution
_mainHeaders = {
'Content-type': 'application/json; charset=UTF-8',
'Authorization': 'Bearer $token',
};
}
Future<Response> getData(String url) async {
try {
Response response = await get(url);
return response;
} catch (e) {
return Response(statusCode: 1, statusText: e.toString());
}
}
}
Related
I need to use timeout if post request not working so, I write below code:
class APIService {
static var client = http.Client();
static Future<bool> login(LoginRequestModel model) async {
Map<String, String> requestHeaders = {
'Content-Type': 'application/json',
};
var url = Uri.http(Config.apiURL, Config.loginAPI);
try {
final response = await client
.post(
url,
headers: requestHeaders,
body: jsonEncode(model.toJson()),
)
.timeout(const Duration(seconds: 5));
print("response:");
print(response);
if (response.statusCode == 200) {
//SHARED
await SharedService.setLoginDetails(loginResponseJson(response.body));
return true;
} else {
return false;
}
} on TimeoutException catch (e) {
// handle timeout
return false;
}
}
But never end await client.post method waiting althouth I add timeout. How can I solve this ?
You can try this:
import 'package:http/http.dart' as http;
import 'package:http/io_client.dart' as http;
final body = { 'email': email, 'password': password };
final client = http.Client();
http.Response res;
try {
res = await client
.post(
url,
headers: requestHeaders,
body: jsonEncode(model.toJson()),
.catchError((e) {
// SocketException would show up here, potentially after the timeout.
})
.timeout(const Duration(seconds: 5));
} on TimeoutException catch (e) {
// Display an alert, no internet
} catch (err) {
print(err);
return null;
}
I have the following Flutter & Dart code function, which sends a request to the server:
Future<void> autoAuth(BuildContext ctx) async {
final url = Uri.parse('${this._baseURL.toString()}/auto-auth');
try {
final deviceStorage = await SharedPreferences.getInstance();
if (deviceStorage.getString('refreshToken') == null) {
return this._setUser(null);
}
final response = await http.post(url, headers: {
'Authorization': 'Bearer ${deviceStorage.getString('refreshToken')!}',
}).timeout(const Duration(seconds: 3));
final Map<String, dynamic> responseBody = json.decode(response.body);
if (responseBody['success']) {
this._refreshAccessToken(ctx, deviceStorage);
return this._setUser(new User(
id: responseBody['data']['id'],
isSubscribed: responseBody['data']['isSubscribed'],
playlistId: responseBody['data']['playlistId'],
));
}
this._setUser(null);
} on SocketException {
this._setUser(null);
throw Error();
} on TimeoutException {
this._setUser(null);
throw Error();
} catch (_) {
this._setUser(null);
}
}
Note, that url is wrong intentionally, so the request will timeout.
But, for this, I coded: .timeout(...) on the future request. So, basically, after 3 secnods it should caught by on TimeoutException exception catch.
It does so. However, after something like 1 minute (probably some default timeout of http request in dart), I get an uncaught exception because the request has timed-out. Where Am I wrong?
This is because you are using it in the wrong way. The .timeout code you use, is generic timeout for any future. Thus, you catch the error of the future timeout, but you don't catch the error being generated from the http request timeout.
To use it correctly, first add the following import: import 'package:http/io_client.dart' as http;
Then change the code to:
final ioClient = HttpClient();
ioClient.connectionTimeout = const Duration(seconds: 3);
final client = http.IOClient(ioClient);
final response = await client.post(url, headers: {
'Authorization': 'Bearer ${deviceStorage.getString('refreshToken')!}',
});
I am using this library https://pub.dev/packages/graphql_flutter for graphql in a flutter web application. Below code can be used to get authentication token:
import 'package:graphql_flutter/graphql_flutter.dart';
final HttpLink httpLink = HttpLink(
'https://api.github.com/graphql',
);
final AuthLink authLink = AuthLink(
getToken: () async => 'Bearer <YOUR_PERSONAL_ACCESS_TOKEN>',
// OR
// getToken: () => 'Bearer <YOUR_PERSONAL_ACCESS_TOKEN>',
);
but how can I put the token in the http header like x-api-key: xxxx when sending requests?
I have tried:
HttpLink link = HttpLink(
uri: 'https://api.github.com/graphql',
headers: <String, String>{
'x-api-key': 'xxxx',
},
);
but it gives me the error: The named parameter 'uri' isn't defined. Try correcting the name to an existing named parameter's name, or defining a named parameter with the name 'uri'.
Update: base on the answer from #Moaid
import 'package:graphql_flutter/graphql_flutter.dart';
typedef GetHeaders = FutureOr<Map<String, String>> Function();
class CustomAuthLink extends Link {
CustomAuthLink({
this.getHeaders,
});
final GetHeaders getHeaders;
#override
Stream<Response> request(Request request, [NextLink forward]) {
StreamController<Response> controller;
Future<void> onListen() async {
try {
final Map<String, String> headers = await getHeaders();
return request.updateContextEntry<HttpLinkHeaders>(
(_headers) => HttpLinkHeaders(
headers: <String, String>{
...headers,
},
),
);
} catch (error) {
controller.addError(error);
}
await controller.addStream(forward(request));
await controller.close();
}
controller = StreamController<Response>(onListen: onListen);
return controller.stream;
}
}
Base on the answer from #moaid-alrazhy and after checking how AuthLink is working
class CustomAuthLink extends Link {
CustomAuthLink();
#override
Stream<Response> request(Request request, [NextLink? forward]) async* {
// Some logic here
final AuthService authService = GetIt.I.get<AuthService>();
final String? token = authService.token;
final String deviceID = await DeviceInformation.deviceIMEINumber;
// TIP: do not forget getting new Request instance!
final Request req = request.updateContextEntry<HttpLinkHeaders>(
(HttpLinkHeaders? headers) => HttpLinkHeaders(
headers: <String, String>{
// put oldest headers
...headers?.headers ?? <String, String>{},
// and add a new headers
'Authorization': 'Bearer $token',
'x-device-id': deviceID,
},
),
);
// and "return" new Request with updated headers
yield* forward!(req);
}
}
Probably if you need to change only the name of the Authentication value you can edit the headerKey param
otherwise other parameters can be insert in the "defaultHeaders" fields of the HttpLink object. but I don't know if they can be use for authentication
you can add it to your HttpLink like this
HttpLink link = HttpLink(
'https://api.github.com/graphql',
headers: <String, String>{
'x-api-key': 'xxxx',
},
);
however this was in old versions .. now for more headers your have to write your own CustomAuthLink like
typedef GetHeaders = Future<Map<String, String>> Function();
class CustomAuthLink extends Link {
CustomAuthLink({
this.getHeaders,
}) : super(
request: (Operation operation, [NextLink forward]) {
StreamController<FetchResult> controller;
Future<void> onListen() async {
try {
final Map<String, String> headers = await getHeaders();
operation.setContext(<String, Map<String, String>>{
'headers': headers
});
} catch (error) {
controller.addError(error);
}
await controller.addStream(forward(operation));
await controller.close();
}
controller = StreamController<FetchResult>(onListen: onListen);
return controller.stream;
},
);
GetHeaders getHeaders;
}
I tried using http package of flutter and create a custom client with headers.
Code
class ApiClient extends http.BaseClient {
final http.Client _inner;
ApiClient(this._inner);
_setHeaders() => {
'Content-type': 'application/json',
'Accept': 'application/json',
'Authorization': 'Bearer token here...'
};
Future<http.StreamedResponse> send(http.BaseRequest request) {
request.headers.addAll(_setHeaders());
return _inner.send(request);
}
}
How can I add a base URL to my custom client?
Since ApiClient inherits http.BaseClient, you should be able to have access to other methods as well. Simply access the method on your ApiClient for example.
var baseUrl = Uri.parse('https://example.com/');
var response = await ApiClient.post(baseUrl);
I use a similar approach on my projects:
class ApiClient extends http.BaseClient {
final http.Client _inner;
final String baseUrl;
ApiClient(this._inner, this.baseUrl);
Uri url(String path, [Map<String, String?>? queryParameters]) {
return Uri.parse('$baseUrl$path').replace(queryParameters: queryParameters);
}
// other methods ...
}
Usage sample:
final api = ApiClient(inner, 'https://testhost/api/v1');
final response = await api.post(api.url('/test', {'q': 'a'}));
I'm having a bit of difficulty with registering to aqueduct backend from my Flutter frontend
Here is my code in my frontend:
Future<void> signUp(String email, String password) async {
final body = "username:$email,password:$password"; //<- return request entity could not be decoded
//final body = {"username": email, "password": password}; //<- return bad state: Cannot set the body fields of Request with content-type "application/json"
try {
final http.Response response = await http.post(
"http://localhost:8888/register",
headers: {"Content-Type": "application/json"},
body: body);
final jsonResponse = json.decode(response.body);
if (jsonResponse["error"] != null) {
throw HttpException(jsonResponse["error"]);
}
} catch (error) {
throw error;
}
}
There must be some silly mistake. I believe it is with formatting body so I tried 2 options and both throw different http exception (as in comment).
Here is an example of connecting to an Aqueduct server from a Flutter client. (This isn't really a server question, though, since the client and server are independent of each other.)
Here is an example of registering:
void _register(String email, String password) async {
Map<String, String> headers = {"Content-type": "application/json"};
final jsonString = '{"username":"$email", "password":"$password"}';
Response response = await post(YOUR_URL_HERE, headers: headers, body: jsonString);
print('${response.statusCode} ${response.body}');
}
In your example you aren't encoding the JSON correctly.
And here is another example of signing in. The class is a view model architecture that I talk about here.
import 'dart:convert';
import 'package:flutter/foundation.dart';
import 'package:http/http.dart' as http;
class LoginViewModel extends ChangeNotifier {
String _token = '';
bool _isLoggedIn = false;
bool get isLoggedIn => _isLoggedIn;
String get token => _token;
Future onLoginPressed(String username, String password) async {
if (username.isEmpty || password.isEmpty) {
return;
}
_isLoggedIn = await _login(username, password);
notifyListeners();
}
Future<bool> _login(String username, String password) async {
var clientID = 'com.example.app';
var clientSecret = '';
var body = 'username=$username&password=$password&grant_type=password';
var clientCredentials = Base64Encoder().convert('$clientID:$clientSecret'.codeUnits);
Map<String, String> headers = {
'Content-type': 'application/x-www-form-urlencoded',
'authorization': 'Basic $clientCredentials'
};
var response = await http.post(YOUR_URL_HERE, headers: headers, body: body);
final responseBody = response.body;
if (response.statusCode != 200) {
return false;
}
final map = json.decode(responseBody);
_token = map['access_token'];
return true;
}
}