AFOAuth2Client 和刷新令牌

Question

如何在 iPad 应用中实现 Oauth？

oauth 2.0中AFOAuth2Client如何管理刷新令牌机制？

是否有任何方法可以在类中实现它，还是我们必须以自己的方式实现它？如何查看token是否过期？

Answer 1

我解决这个问题的方法是用一个代码块包装我的所有请求，如果需要，它将刷新访问令牌，例如

为成功和失败块添加一些类型定义：

typedef void (^YFRailsSaasApiClientSuccess)(AFJSONRequestOperation *operation, id responseObject);
typedef void (^YFRailsSaasApiClientFailure)(AFJSONRequestOperation *operation, NSError *error);

那么请求方法是：

- (void)getProductsWithSuccess:(YFRailsSaasApiClientSuccess)success failure:(YFRailsSaasApiClientFailure)failure {
    NSLog(@"getProductsWithSuccess");

    success = ^(AFJSONRequestOperation *operation, id responseObject) {
        [self getPath:@"api/1/products"
           parameters:nil
              success:^(AFHTTPRequestOperation *operation, id responseObject) {
                  NSLog(@"getProductsWithSuccess: success");

                  // TODO: handle response

                  if (success) {
                      success((AFJSONRequestOperation *)operation, responseObject);
                  }
              } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
                  NSLog(@"getProductsWithSuccess: failure");
              if (failure) {
                  failure((AFJSONRequestOperation *)operation, error);
              }
          }];
    };

    [self refreshAccessTokenWithSuccess:success failure:failure];
}

检查令牌过期并在需要时刷新它的方法是：

- (void)refreshAccessTokenWithSuccess:(YFRailsSaasApiClientSuccess)success failure:(YFRailsSaasApiClientFailure)failure {
    NSLog(@"refreshAccessTokenWithSuccess");

    if (self.credential == nil) {
        if (failure) {
            NSMutableDictionary *errorDetail = [NSMutableDictionary dictionary];
            [errorDetail setValue:@"Failed to get credentials" forKey:NSLocalizedDescriptionKey];
            NSError *error = [NSError errorWithDomain:@"world" code:200 userInfo:errorDetail];
            failure(nil, error);
        }
        return;
    }  

    if (!self.credential.isExpired) {
        NSLog(@"refreshAccessTokenWithSuccess: credential has not expired");

        if (success) {
            success(nil, nil);
        }
        return;
    }

    NSLog(@"refreshAccessTokenWithSuccess: refreshing credential");

    [self authenticateUsingOAuthWithPath:@"oauth/token"
                            refreshToken:self.credential.refreshToken
                                 success:^(AFOAuthCredential *newCredential) {
                                     NSLog(@"Successfully refreshed OAuth credentials %@", newCredential.accessToken);
                                     self.credential = newCredential;
                                     [AFOAuthCredential storeCredential:newCredential
                                                     withIdentifier:self.serviceProviderIdentifier];

                                     if (success) {
                                         success(nil, nil);
                                     }
                                 }
                                 failure:^(NSError *error) {
                                     NSLog(@"An error occurred refreshing credential: %@", error);
                                     if (failure) {
                                         failure(nil, error);
                                     }
                                 }];
}

完整的源代码在 GitHub 上：https://github.com/yellowfeather/rails-saas-ios。