Question

完全遵循"Getting started" guide for Amazon DynamoDB on Android之后，我最终得到了所有正确的表格，角色政策等，以及该代码：

CognitoCachingCredentialsProvider credentialsProvider = new CognitoCachingCredentialsProvider(
        getApplicationContext(),
        "eu-west-1:01234567-abcd-8901-efab-234567890123", // Identity Pool ID
        Regions.EU_WEST_1 // Region
);

AmazonDynamoDBClient ddbClient = new AmazonDynamoDBClient(credentialsProvider);
final DynamoDBMapper mapper = new DynamoDBMapper(ddbClient);

final Book book = new Book("My new book"); // Simplified version of Book
new Thread(new Runnable() {
    @Override
    public void run() {
        mapper.save(book);
        Log.v("Sync", "Book saved!");
    }
}).start();

重要提示，与本教程最大的（但无法察觉的）差异在于我位于欧洲，所以我的地区是eu-west-1（爱尔兰）。

但是，如果正确地遵循了所有内容，我会收到以下错误：

com.amazonaws.AmazonServiceException: User: arn:aws:sts::012345678901:assumed-role/Cognito_BookUnauth_Role/CognitoIdentityCredentials is not authorized to perform: dynamodb:UpdateItem on resource: arn:aws:dynamodb:us-east-1:012345678901:table/Books (Service: AmazonDynamoDBv2; Status Code: 400; Error Code: AccessDeniedException; Request ID: 05OLSSM8F8EN15SO0JD8VELCNNVV4KQNSO5AEMVJF66Q9ASUAAJG)
    at com.amazonaws.http.AmazonHttpClient.handleErrorResponse(AmazonHttpClient.java:709)
    at com.amazonaws.http.AmazonHttpClient.executeHelper(AmazonHttpClient.java:385)
    at com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:196)
    at com.amazonaws.services.dynamodbv2.AmazonDynamoDBClient.invoke(AmazonDynamoDBClient.java:3257)
    at com.amazonaws.services.dynamodbv2.AmazonDynamoDBClient.updateItem(AmazonDynamoDBClient.java:965)
    at com.amazonaws.mobileconnectors.dynamodbv2.dynamodbmapper.DynamoDBMapper$SaveObjectHandler.doUpdateItem(DynamoDBMapper.java:1173)
    at com.amazonaws.mobileconnectors.dynamodbv2.dynamodbmapper.DynamoDBMapper$2.executeLowLevelRequest(DynamoDBMapper.java:873)
    at com.amazonaws.mobileconnectors.dynamodbv2.dynamodbmapper.DynamoDBMapper$SaveObjectHandler.execute(DynamoDBMapper.java:1056)
    at com.amazonaws.mobileconnectors.dynamodbv2.dynamodbmapper.DynamoDBMapper.save(DynamoDBMapper.java:904)
    at com.amazonaws.mobileconnectors.dynamodbv2.dynamodbmapper.DynamoDBMapper.save(DynamoDBMapper.java:688)
    at com.davidferrand.books$4.run(MainActivity.java:136)
    at java.lang.Thread.run(Thread.java:818)

Answer 1

这个“bug”很棘手，我花了好几个小时来解决它。该指南假设您位于us-east-1区域，这也是您创建的AmazonDynamoDBClient的默认端点。

只要您的数据库位于其他区域，就必须在创建AmazonDynamoDBClient 时明确指定区域。

最好的方法是：

AmazonDynamoDBClient ddbClient = Region.getRegion(Regions.EU_WEST_1) // CRUCIAL
    .createClient(
        AmazonDynamoDBClient.class,
        credentialsProvider,
        new ClientConfiguration()
    );

Cognito＆amp; DynamoDB：“未授权执行：dynamodb：资源上的UpdateItem”

1 个答案: