login method Null safety

void login(
  1. String username,
  2. String password
)

Gets the JWT and refresh token through the API

Will throw an Exception if the password and user do not match OR API returns a 400

var client = MDClient()
client.login('myuser','mypassword')

Implementation

void login(String username, String password) {
  http.post(Uri.parse('https://api.mangadex.org/auth/login'),
      body: '{"username":"$username","password":"$password"}',
      headers: {
        HttpHeaders.contentTypeHeader: 'application/json',
        HttpHeaders.userAgentHeader: 'mangadex_dart_api/1.0'
      }).then((res) {
    if (res.statusCode == 401) {
      throw 'User and Password does not match';
    } else if (res.statusCode == 400) {
      throw 'Bad request';
    }
    var data = jsonDecode(res.body);
    token = data['token']['session'];
    refresh = data['token']['refresh'];
  });
}