AWS/iOS版/ Cognito：未經驗證的訪問不支持這個身份池

Question

我試圖得到S3TransferUtilitySampleObjC項目，我Cognito和AWS憑據工作。

不幸的是我得到的錯誤如下：

AWSURLSessionManager.m line:566 | -[AWSURLSessionManager printHTTPHeadersForResponse:] | Response headers: 
{ 
    Connection = "keep-alive"; 
    "Content-Length" = 111; 
    "Content-Type" = "application/x-amz-json-1.1"; 
    Date = "Mon, 16 Jan 2017 17:17:50 GMT"; 
    "x-amzn-ErrorMessage" = "Unauthenticated access is not supported for this identity pool."; 
    "x-amzn-ErrorType" = "NotAuthorizedException:"; 
    "x-amzn-RequestId" = "xxxxxxxxx-xxxxx-xxxxx-xxxx-xxxxxxx"; 
} 

你能幫忙嗎？

---

代碼（注意，我只移除了SecondViewController一些代碼，修改常量的值 - 我還修改了Info.plist文件（見下面的截圖）

我目前只關注在從我的S3存儲下載文件 因此，我只修改了以下內容：

// In Constants.m 
NSString *const S3BucketName = @"mybucketname"; 
NSString *const S3DownloadKeyName = @"config.plist"; 

// In SecondViewController.m 

#import "SecondViewController.h" 
#import "AppDelegate.h" 
#import <AWSS3/AWSS3.h> 
#import "Constants.h" 

@interface SecondViewController() 

@property (weak, nonatomic) IBOutlet UIImageView *imageView; 
@property (weak, nonatomic) IBOutlet UIProgressView *progressView; 
@property (weak, nonatomic) IBOutlet UILabel *statusLabel; 

@property (copy, nonatomic) AWSS3TransferUtilityDownloadCompletionHandlerBlock completionHandler; 
@property (copy, nonatomic) AWSS3TransferUtilityProgressBlock progressBlock; 

@end 

@implementation SecondViewController 

- (void)viewDidLoad { 
    [super viewDidLoad]; 

    self.progressView.progress = 0; 
    self.statusLabel.text = @"Ready"; 

    __weak SecondViewController *weakSelf = self; 
    self.completionHandler = ^(AWSS3TransferUtilityDownloadTask *task, NSURL *location, NSData *data, NSError *error) { 
     dispatch_async(dispatch_get_main_queue(), ^{ 
      if (error) { 
       weakSelf.statusLabel.text = @"Failed to Download"; 
      } 
      if (data) { 
       weakSelf.statusLabel.text = @"Successfully Downloaded"; 
       weakSelf.imageView.image = [UIImage imageWithData:data]; 
       weakSelf.progressView.progress = 1.0; 
      } 
     }); 
    }; 

    self.progressBlock = ^(AWSS3TransferUtilityTask *task, NSProgress *progress) { 
     dispatch_async(dispatch_get_main_queue(), ^{ 
      weakSelf.progressView.progress = progress.fractionCompleted; 
     }); 
    }; 

    AWSS3TransferUtility *transferUtility = [AWSS3TransferUtility defaultS3TransferUtility]; 
    [transferUtility enumerateToAssignBlocksForUploadTask:nil downloadTask:^(AWSS3TransferUtilityDownloadTask * _Nonnull downloadTask, AWSS3TransferUtilityProgressBlock _Nullable __autoreleasing * _Nullable downloadProgressBlockReference, AWSS3TransferUtilityDownloadCompletionHandlerBlock _Nullable __autoreleasing * _Nullable completionHandlerReference) { 
     NSLog(@"%lu", (unsigned long)downloadTask.taskIdentifier); 

     *downloadProgressBlockReference = weakSelf.progressBlock; 
     *completionHandlerReference = weakSelf.completionHandler; 

     dispatch_async(dispatch_get_main_queue(), ^{ 
      self.statusLabel.text = @"Uploading..."; 
     }); 
    }]; 
} 

- (IBAction)start:(id)sender { 
    self.imageView.image = nil; 

    AWSS3TransferUtilityDownloadExpression *expression = [AWSS3TransferUtilityDownloadExpression new]; 
    expression.progressBlock = self.progressBlock; 

    AWSS3TransferUtility *transferUtility = [AWSS3TransferUtility defaultS3TransferUtility]; 
    [[transferUtility downloadDataFromBucket:S3BucketName 
             key:S3DownloadKeyName 
            expression:expression 
          completionHander:self.completionHandler] continueWithBlock:^id(AWSTask *task) { 
     if (task.error) { 
      NSLog(@"Error: %@", task.error); 
     } 
     if (task.exception) { 
      NSLog(@"Exception: %@", task.exception); 
     } 
     if (task.result) { 
      dispatch_async(dispatch_get_main_queue(), ^{ 
       self.statusLabel.text = @"Downloading..."; 
      }); 
     } 

     return nil; 
    }]; 
} 

的Info.plist文件修改爲：

Answer 1

你得到的解釋問題的錯誤 - 你發送到Cognito請求作爲未認證的用戶，這意味着沒有登錄包括/鏈接該標識雖然未啓用該池。

未認證的身份是功能爲標識池的選擇，您必須啓用它在創建/從Cognito控制檯編輯池。