Rest api client

Abstraction for communicating with REST API in flutter projects. Incorporates exception handling and jwt with refresh token authorization. You can also find this package on pub as rest_api_client

Usage

This must be called once per application lifetime

await RestApiClient.initFlutter();

RestApiClient restApiClient = RestApiClientImpl(
  options: RestApiClientOptions(
    //Defines your base API url eg. https://mybestrestapi.com
    baseUrl: 'https://gorest.co.in/public/v2/',

    //Enable caching of response data
    cacheEnabled: true,
  ),
  authOptions: AuthOptions(
    //Define refresh token endpoint for RestApiClient
    //instance to use the first time response status code is 401
    refreshTokenEndpoint: '/api/auth/refresh-token',

    //Define the name of your api parameter name
    //on RefreshToken endpoint eg. 'refreshToken' or 'value' ...
    refreshTokenParameterName: 'token',

    refreshTokenBodyBuilder: (jwt, refreshToken) => {
      'accessToken': jwt,
      'refreshToken': refreshToken,
    },

    refreshTokenHeadersBuilder: (jwt, _) => {
      RestApiClientKeys.authorization: 'Bearer $jwt',
    },

    //This method is called on successfull call to refreshTokenEndpoint
    //Provides a way to get a jwt from response, much like
    //resolveValidationErrorsMap callback
    resolveJwt: (response) => response.data['accessToken'],

    //Much like resolveJwt, this method is used to resolve
    //refresh token from response
    resolveRefreshToken: (response) => response.data['refreshToken'],
  ),
  loggingOptions: LoggingOptions(
    //Toggle logging of your requests and responses
    //to the console while debugging
    logNetworkTraffic: true,
  ),
  exceptionOptions: ExceptionOptions(
    resolveValidationErrorsMap: (response) {
      if (response != null && response.data != null && response.data['code'] != null) {
        return {
          'ERROR': [response.data['code']],
        };
      }

      return {};
    },
  ),
  cacheOptions: CacheOptions(
    useAuthorization: true,
    cacheLifetimeDuration: const Duration(days: 10),
    resetOnRestart: false,
  ),
  interceptors: [
    InterceptorsWrapper(
      onRequest: (options, handler) {
        log('Logging before request');

        return handler.next(options);
      },
      onResponse: (response, handler) {
        log('Logging on response');

        return handler.next(response);
      },
      onError: (DioException e, handler) {
        log('Logging on error');

        return handler.next(e);
      },
    ),
  ],
);

init must be called, preferably right after the instantiation

await restApiClient.init();

Use restApiClient from this point on

If you are using authentication in you app it would look like this

final response = await restApiClient.post(
  '/Authentication/Authenticate',
  data: {'username': 'john', 'password': 'Flutter_is_awesome1!'},
);

Extract the values from response

var jwt = response.data['jwt'];
var refreshToken = response.data['refreshToken'];

Let's asume that somehow we got jwt and refresh token Probably pinged our api Authentication endpoint to get these two values

jwt = 'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwiZmx1dHRlciI6IkZsdXR0ZXIgaXMgYXdlc29tZSIsImNoYWxsZW5nZSI6IllvdSBtYWRlIGl0LCB5b3UgY3JhY2tlZCB0aGUgY29kZS4gWW91J3JlIGF3ZXNvbWUgdG9vLiIsImlhdCI6MTUxNjIzOTAyMn0.5QJz8hhxYsHxShS4hWKdHzcFH_IsQQZAnWSEcHJkspE';
refreshToken = 'c91c03ea6c46a86cbc019be3d71d0a1a';

Set the authorization

restApiClient.authorize(jwt: jwt, refreshToken: refreshToken);

Create authorized requests safely

restApiClient.get('/Products');

Ignore server errors that might happen in the next request

restApiClient.exceptionHandler.exceptionOptions.showInternalServerErrors = false;

try {
  restApiClient.get(
    '/Products',
    queryParameters: {'name': 'darts'},
  );
} catch (e) {
  print(e);
}

Ignore all exceptions that might happen in the next request

restApiClient.exceptionHandler.exceptionOptions.disable();

restApiClient.post(
  '/Products/Reviews/234',
  data: {'grade': 5, 'comment': 'Throwing dart is not safe but upgrading to Dart 2.12.1 is. #nullsafety'},
);

restApiClient.put(
  '/Products/Reviews/234',
  data: {
    'grade': 5,
    'comment': 'On the other hand throwing dartz is fun',
  },
);

restApiClient.delete('/Products/Reviews/234');