无法使用Swift SDK对AWS AppSync的用户进行身份验证 [英] cannot authenticate user for aws appsync with swift SDK

问题描述

我正在尝试使用AWS Swift SDK从我的Swift移动应用程序连接到我的AWS AppSync服务，但始终出现以下错误：

I am trying to connect to my AWS AppSync service from my Swift mobile app using the AWS Swift SDK but keep getting the following error:

Error occurred: (401 unauthorized) Did not receive a successful HTTP code.

我正在使用用户池，并已按照教程快速进行了所有设置。我的问题是，如何在请求中合并控制台中生成的AppSync.json配置文件？该教程中未提及，可能是我无法连接的原因。

I am using User Pools and have set everything up following the tutorial for swift. My question is, how do I incorporate the AppSync.json config file generated in the console in my request? That is not mentioned in the tutorial and may be the reason I cannot connect.

json文件如下所示：

The json file looks like this:

{
    "graphqlEndpoint": "my_endpoint_url",
    "region": "us-east-1",
    "authenticationType": "AMAZON_COGNITO_USER_POOLS",
    "apiKey": null
}

我正在使用以下配置：

// Set up  Amazon Cognito credentials
let credentialsProvider = AWSCognitoCredentialsProvider(regionType: CognitoIdentityRegion,
                                                        identityPoolId: CognitoIdentityPoolId, identityProviderManager: pool)
// You can choose your database location, accessible by SDK
let databaseURL = URL(fileURLWithPath:NSTemporaryDirectory()).appendingPathComponent(database_name)

do {
    // Initialize the AWS AppSync configuration

    let appSyncConfig = try AWSAppSyncClientConfiguration(url: AppSyncEndpointURL,
                                                          serviceRegion: AppSyncRegion,
                                                          credentialsProvider: credentialsProvider,
                                                          databaseURL:databaseURL)

    appSyncClient = try AWSAppSyncClient(appSyncConfig: appSyncConfig)
    // Set id as the cache key for objects
    appSyncClient?.apolloClient?.cacheKeyForObject = { $0["id"] }
} catch {
    print("Error initializing appsync client. \(error)")
}

EDIT＃1

事实证明该示例使用的是API密钥方法而非用户池，因此现在我将配置更改为：

It turns out the example is using the API key method rather than user pools. So now I have changed the config to:

let appSyncConfig = try AWSAppSyncClientConfiguration(url: AppSyncEndpointURL, serviceRegion: AppSyncRegion, userPoolsAuthProvider: CognitoUserPoolsAuthProvider(pool: pool))

问题是现在的消息是：

Use of unresolved identifier 'CognitoUserPoolsAuthProvider'

如果我尝试：

let appSyncConfig = try AWSAppSyncClientConfiguration(url: AppSyncEndpointURL, serviceRegion: AppSyncRegion, userPoolsAuthProvider: AWSCognitoUserPoolsAuthProvider(pool: pool))

错误是：

'AWSCognitoUserPoolsAuthProvider' cannot be constructed because it has no accessible initializers

不确定如何满足配置中的userPoolsAuthProvider：参数。

Not sure how to satisfy the userPoolsAuthProvider: argument in the config.

推荐答案

要解决您的特定问题， userPoolsAuthProvider 需要接受一个扩展 AWSCognitoUserPoolsAuthProvider 协议的类。因此，您的实例化应如下所示：

To address your specific issue, userPoolsAuthProvider needs to accept a class that extends the AWSCognitoUserPoolsAuthProvider protocol. So your instantiation would look something like this:

 let appSyncConfig = try AWSAppSyncClientConfiguration(url: AppSyncEndpointURL,
                                                          serviceRegion: AppSyncRegion,
                                                          userPoolsAuthProvider: self,
                                                          databaseURL:databaseURL)

您将在其中创建AppSyncClient的类，扩展如下：

And then in the class in which you are creating the AppSyncClient, you would extend like this:

extension YourClass: AWSCognitoUserPoolsAuthProvider {
  func getLatestAuthToken() -> String {
    var token: String = ""

    // pool is an instance of AWSCognitoIdentityUserPool
    self.pool?.currentUser()?.getSession().continueOnSuccessWith(block: { (task) -> Any? in 
      token = task.result!.idToken!.tokenString
      return nil
    }).waitUnitFinished()
  }

  return token
}

我也思考默认情况下，AppSync配置在您的项目中查找 awsconfiguration.json 文件。您前不久发布了此消息，因此AWS服务和AppSync可能发生了变化。

Also I think the AppSync configuration by default looks for an awsconfiguration.json file in your project. You posted this a while back so possibly things have changed with AWS services and AppSync.

希望这会有所帮助

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