問題描述

我原本以為這個問題是由于區域不匹配造成的，但是在更改區域后，我在嘗試此處找到的 Amazon AWS 示例時仍然遇到以下錯誤:

I had originally thought that this issue was due to mismatching regions, but after changing the region, I'm still coming across the following error when trying out an Amazon AWS sample found here:

DynamoDBMapper

 AmazonServiceException: User: arn:aws:sts::[My Account
 ARN]:assumed-role/Cognito_AndroidAppUnauth_DefaultRole/ProviderSession
 is not authorized to perform: dynamodb:DescribeTable on resource:
 arn:aws:dynamodb:us-east-1:[My Account ARN]:table/test_table (Service:
 AmazonDynamoDBv2; Status Code: 400; Error Code: AccessDeniedException;
 Request ID: BBFTS0Q8UHTMG120IORC2KSASVVV4KQNSO5AEMVJF66Q9ASUAAJG)

一切都或多或少相同，我唯一更改的是將 DBclient 區域更改為 US_EAST_1，我的測試表在其中托管并修改使用Amazon Cognito 入門代碼"頁面中的信息生成的常量文件，該頁面是按照 Cognito 入門文檔生成的.

Everything is more or less the same, the only things I've changed have been changing the DBclient region to US_EAST_1, where my test table is hosted and modifying the Constants file using the info from the 'Amazon Cognito Starter Code' page that is generated through following the Cognito get started documentation.

sdkforandroid-cognito-auth

對于我的 Cognito_AndroidAppUnauth_DefaultRole 角色策略，我修改了默認的移動分析和同步服務權限，使其還包括對所有表(無論是否存在)的所有操作的訪問:

For my Cognito_AndroidAppUnauth_DefaultRole role policy I modified the default mobile analytics and sync service permission to also include access of all actions on all tables, existing or not:

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "CognitoPolicy",
            "Action": [
                "mobileanalytics:PutEvents",
                "cognito-sync:*"
            ],
            "Effect": "Allow",
            "Resource": [
                "*"
            ]
        },
        {
            "Sid": "DynamoDBPolicy",
            "Effect": "Allow",
            "Action": [
                "dynamodb: *"
            ],
            "Resource": "*"
        }
    ]
}

那么為什么它聲稱在使用正確的區域時它沒有權限并且 Unauth 策略應該允許表訪問?

So why is it claiming that it doesn't have permission when the correct region is used and the Unauth policy should allow for table access?

調用 DynamoDB 資源(創建表)上的方法時的 Stacktrace，它是否有用

Stacktrace when calling a method on the DynamoDB resource (create table), should it prove useful

   com.amazonaws.AmazonServiceException: User: arn:aws:sts::[My Account ARN]:assumed-role/Cognito_AndroidAppUnauth_DefaultRole/ProviderSession is not authorized to perform: dynamodb:CreateTable on resource: arn:aws:dynamodb:us-east-1:[My Account ARN]:table/test_table (Service: AmazonDynamoDBv2; Status Code: 400; Error Code: AccessDeniedException; Request ID: SDELNSMLO10EV7CM2STC1R9RU3VV4KQNSO5AEMVJF66Q9ASUAAJG)
            at com.amazonaws.http.AmazonHttpClient.handleErrorResponse(Unknown Source)
            at com.amazonaws.http.AmazonHttpClient.executeHelper(Unknown Source)
            at com.amazonaws.http.AmazonHttpClient.execute(Unknown Source)
            at com.amazonaws.services.dynamodbv2.AmazonDynamoDBClient.invoke(Unknown Source)
            at com.amazonaws.services.dynamodbv2.AmazonDynamoDBClient.createTable(Unknown Source)
            at com.amazonaws.demo.userpreferencesom.DynamoDBManager.createTable(DynamoDBManager.java:72)
            at com.amazonaws.demo.userpreferencesom.UserPreferenceDemoActivity$DynamoDBManagerTask.doInBackground(UserPreferenceDemoActivity.java:99)
            at com.amazonaws.demo.userpreferencesom.UserPreferenceDemoActivity$DynamoDBManagerTask.doInBackground(UserPreferenceDemoActivity.java:85)
            at android.os.AsyncTask$2.call(AsyncTask.java:288)
            at java.util.concurrent.FutureTask.run(FutureTask.java:237)
            at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
            at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
            at java.lang.Thread.run(Thread.java:841)

推薦答案

與亞馬遜工程師合作，發現問題出在策略配置中:

Worked with an Amazon engineer and it turns out the problem was in the policy configuration:

"dynamodb: *"

應該是

"dynamodb:*"

一個空間能做什么真是太神奇了.

It's amazing what a space can do.

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