CognitoIdentityCredentials 无权执行：dynamodb：对资源的查询：

Question

我一直在关注 DynamoDB 使用的 AWS 文档和示例代码，但在我的进步中停滞不前。 正确设置我的 Cognito 用户池/身份和 IAM 角色后，我无法再查询我的 DynamoDB 表。 我能够毫无问题地运行扫描、删除和 GetItem，但无法运行查询。 我的未经授权的 IAM 角色设置是否正确以在我的 DynamoDB 表上运行查询？

IAM 未授权角色：

{
"Version": "2012-10-17",
"Statement": [
    {
        "Sid": "Stmt1474743569000",
        "Effect": "Allow",
        "Action": [
            "dynamodb:*"
        ],
        "Resource": [
            "arn:aws:dynamodb:us-east-1:XXXXXXXXXXXX:table/MyTable1"
        ]
    },
    {
        "Sid": "Stmt1474743616000",
        "Effect": "Allow",
        "Action": [
            "dynamodb:*"
        ],
        "Resource": [
            "arn:aws:dynamodb:us-east-1:XXXXXXXXXXXX:table/MyTable2"
        ]
    }
]

查询功能：

func getQuery(){
    //performing a query

    let dynamoDBObjectMapper = AWSDynamoDBObjectMapper.default()

    let queryExpression = AWSDynamoDBQueryExpression()
    //queryExpression.scanIndexForward = 1
    queryExpression.indexName = "Pay"

    queryExpression.keyConditionExpression = "Company = :Company AND Pay > :Pay"

    queryExpression.expressionAttributeValues = [
        ":Company" : "TestCompany",
        ":Pay" : 0];

    dynamoDBObjectMapper .query(DDBTableRow.self, expression: queryExpression) .continue(with: AWSExecutor.mainThread(), with: { (task:AWSTask!) -> AnyObject! in
        if (task.error != nil) {
            print("Error: \(task.error)")

            let alertController = UIAlertController(title: "Failed to query a test table.", message: task.error!.localizedDescription, preferredStyle: UIAlertControllerStyle.alert)
            let okAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.cancel, handler: { (action:UIAlertAction) -> Void in
            })
            alertController.addAction(okAction)
            self.present(alertController, animated: true, completion: nil)
        } else {
            if (task.result != nil) {
                self.pagniatedOutput = task.result! as AWSDynamoDBPaginatedOutput
            }
            //self.performSegue(withIdentifier: "unwindToMainSegue", sender: self)
        }
        return nil
    })


}

预先感谢您的任何建议！

更新 #2：添加收到的异常：

    Error: Optional(Error Domain=com.amazonaws.AWSServiceErrorDomain Code=6 "(null)" 

    UserInfo={__type=com.amazon.coral.service#AccessDeniedException, 

    Message=User: arn:aws:sts::XXXXXXXXXX:assumed-role/Cognito_testUserUnauth_Role/CognitoIdentityCredentials is 
    not authorized to perform: dynamodb:Query on resource: arn:aws:dynamodb:us-east-1:XXXXXXXXXXXX:table/MyTable1/index/Pay})

更新 #3：问题出在我的 IAM 角色中的 Resource 参数上。 我做了一个小改动，现在可以查询了。

{
"Version": "2012-10-17",
"Statement": [
    {
        "Sid": "Stmt1474743569000",
        "Effect": "Allow",
        "Action": [
            "dynamodb:*"
        ],
        "Resource": [
            "arn:aws:dynamodb:us-east-1:XXXXXXXXXXXX:table/MyTable1",
            "arn:aws:dynamodb:us-east-1:XXXXXXXXXXXX:table/MyTable1/index/*"
        ]
    },
    {
        "Sid": "Stmt1474743616000",
        "Effect": "Allow",
        "Action": [
            "dynamodb:*"
        ],
        "Resource": [
            "arn:aws:dynamodb:us-east-1:XXXXXXXXXXXX:table/MyTable2",
            "arn:aws:dynamodb:us-east-1:XXXXXXXXXXXX:table/MyTable2/index/*"
        ]
    }
]

Answer 1

更新 #3：问题出在我的 IAM 角色中的 Resource 参数上。 我做了一个小改动，现在可以查询了。

{"Version": "2012-10-17","Statement": [
{
    "Sid": "Stmt1474743569000",
    "Effect": "Allow",
    "Action": [
        "dynamodb:*"
    ],
    "Resource": [
        "arn:aws:dynamodb:us-east-1:XXXXXXXXXXXX:table/MyTable1",
        "arn:aws:dynamodb:us-east-1:XXXXXXXXXXXX:table/MyTable1/index/*"
    ]
},
{
    "Sid": "Stmt1474743616000",
    "Effect": "Allow",
    "Action": [
        "dynamodb:*"
    ],
    "Resource": [
        "arn:aws:dynamodb:us-east-1:XXXXXXXXXXXX:table/MyTable2",
        "arn:aws:dynamodb:us-east-1:XXXXXXXXXXXX:table/MyTable2/index/*"
    ]
}
]