AWS：如何针对Cognito Pool正确认证用户并将其用于Cognito联合身份认证？

Question

我上的应用程序，它会使用两个认证提供商合作：

• Facebook的
• Cognito用户群

对于前者，我觉得没有问题，按预期一切正常。但是，在使用Cognito用户池设置身份验证的同时，我又一次击中了一面墙。我正在使用AWS软件开发工具包2.4.9，XCode 8和Swift 3.

我知道有很多问题已经被问及很多“指南”在那里。但是，他们中的很多人都回答了过时的文档和SDK。即使官方AWS文档已过时。

，我要通过认证步骤如下：

1.配置初始cognito池

/// Set the default service configuration 
let serviceConfiguration = AWSServiceConfiguration(region: AWSRegionType.usEast1, credentialsProvider: nil) 
AWSServiceManager.default().defaultServiceConfiguration = serviceConfiguration 

/// Create a pool configuration and register it for a specific key to use later 
let poolConfiguration = AWSCognitoIdentityUserPoolConfiguration(clientId: appClientID, clientSecret: appClientSecret, poolId: poolID) 
AWSCognitoIdentityUserPool.registerCognitoIdentityUserPool(with: poolConfiguration, forKey: poolKey) 

/// Create a pool for a specific predefined key 
pool = AWSCognitoIdentityUserPool(forKey: poolKey) 

2.验证对Cognito用户池的用户

user.getSession(username, password: password, validationData: nil).continue({ (task) -> AnyObject? in 

     if let error = task.error as? NSError { 
      completionHandler(error) 
      return nil 
     } 

     let session = task.result! as AWSCognitoIdentityUserSession 
     let token = session.idToken!.tokenString 

     let tokens : [NSString:NSString] = ["cognito-idp.us-east-1.amazonaws.com/\(self.poolID!)" as NSString : token as NSString] 
     let identityProvider = CognitoPoolIdentityProvider(tokens: tokens) 

     let credentialsProvider = AWSCognitoCredentialsProvider(regionType: .usEast1, identityPoolId: self.identityPoolID, identityProviderManager: identityProvider) 

     /// Set the default service configuration 
     let serviceConfiguration = AWSServiceConfiguration(region: AWSRegionType.usEast1, credentialsProvider: credentialsProvider) 
     AWSServiceManager.default().defaultServiceConfiguration = serviceConfiguration 

     credentialsProvider.getIdentityId().continue({ (task) -> AnyObject? in 
      completionHandler(task.error as NSError?) 
      return nil 
     }) 

     return nil 
    }) 

3. CognitoPoolIden tityProvider类

class CognitoPoolIdentityProvider : NSObject, AWSIdentityProviderManager { 

     var tokens : NSDictionary = [:] 

     init(tokens: [NSString : NSString]) { 
      self.tokens = tokens as NSDictionary 
     } 

     @objc func logins() -> AWSTask<NSDictionary> { 
      return AWSTask(result: tokens) 
     } 

    } 

4.将数据存储到Cognito联合身份

所有这一切都通过没有任何错误。不过，现在我想保存我从Cognito池中取出一个特定的Cognito联合身份数据集的数据，所以我打电话：userProfile.synchronize().continue和我得到的结果如下：

getCredentialsWithCognito:authenticated:customRoleArn:]_block_invoke | GetCredentialsForIdentity failed. Error is [Error Domain=com.amazonaws.AWSCognitoIdentityErrorDomain Code=8 "(null)" UserInfo={__type=NotAuthorizedException, message=Access to Identity 'us-east-1:xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx' is forbidden.}]

2016-11-10 10:27:16.947365 xxxxxxxx[19867:5614838] AWSiOSSDK v2.4.11 [Error] AWSIdentityProvider.m line:304 | __52-[AWSCognitoCredentialsProviderHelper getIdentityId]_block_invoke.255 | GetId failed. Error is [Error Domain=com.amazonaws.AWSCognitoIdentityErrorDomain Code=8 "(null)" UserInfo={__type=NotAuthorizedException, message=Unauthenticated access is not supported for this identity pool.}] 2016-11-10 10:27:16.947726 xxxxxxxx[19867:5614838] AWSiOSSDK v2.4.11 [Error]

AWSCredentialsProvider.m line:577 | __44-[AWSCognitoCredentialsProvider credentials]_block_invoke.352 | Unable to refresh. Error is [Error Domain=com.amazonaws.AWSCognitoIdentityErrorDomain Code=8 "(null)" UserInfo={__type=NotAuthorizedException, message=Unauthenticated access is not supported for this identity pool.}] 2016-11-10 10:27:16.948452 xxxxxxxx[19867:5614838] AWSiOSSDK v2.4.11 [Error]

AWSCognitoDataset.m line:352 | __30-[AWSCognitoDataset syncPull:]_block_invoke | Unable to list records: Error Domain=com.amazonaws.AWSCognitoIdentityErrorDomain Code=8 "(null)" UserInfo={__type=NotAuthorizedException, message=Unauthenticated access is not supported for this identity pool.} [10:27:16]: saveSettings AWS task error: The operation couldn’t be completed. (com.amazonaws.AWSCognitoIdentityErrorDomain error 8.)

更改日志级别后，我可以看到以下内容：

//REQUEST

2016-11-10 10:33:08.095735 xxxxxxxx[19874:5616142] AWSiOSSDK v2.4.11 [Debug] AWSURLSessionManager.m line:543 | -[AWSURLSessionManager printHTTPHeadersAndBodyForRequest:] | Request body: {"IdentityId":"us-east-1:xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxx"}

//RESPONSE

2016-11-10 10:33:08.714268 xxxxxxxx[19874:5616154] AWSiOSSDK v2.4.11 [Debug] AWSURLSessionManager.m line:553 | -[AWSURLSessionManager printHTTPHeadersForResponse:] | Response headers: { Connection = "keep-alive"; "Content-Length" = 129; "Content-Type" = "application/x-amz-json-1.1"; Date = "Thu, 10 Nov 2016 09:33:08 GMT"; "x-amzn-ErrorMessage" = "Access to Identity 'us-east-1:xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxx' is forbidden."; "x-amzn-ErrorType" = "NotAuthorizedException:"; "x-amzn-RequestId" = "b0ac6fb0-a728-11e6-8413-1fdb846185bb"; }

上述请求是GetID API调用。显然，它与AWS Docs：http://docs.aws.amazon.com/cognitoidentity/latest/APIReference/API_GetId.html中的请求格式不匹配。

按照AWSServiceManager类，我们有这样的：

/** 
The default service configuration object. This property can be set only once, and any subsequent setters are ignored. 
*/ 
@property (nonatomic, copy) AWSServiceConfiguration *defaultServiceConfiguration; 

这意味着，设置新的服务配置是没有意义的，但我看不出有什么其他的方式来刷新，我已经通过Cognito用户群中获得的证书认证。

就是这样。有任何想法吗？

感谢

Answer 1

它从你得到

Access to Identity 'us-east-1:xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx' is forbidden 

，您在第一部分所获得的无法访问的身份凭证所做的同步调用，带这样你的身份很可能改变错误似乎。