我在使用 AWS SDK iOS v2.1.1 以编程方式启用现有存储桶的版本控制时遇到问题。错误是 -[NSNull _fastCharacterContents]: unrecognized selector sent to instance ...。我的代码片段创建了执行 putBucketVersioning 方法的错误结果:

    AWSS3VersioningConfiguration *conf = [AWSS3VersioningConfiguration new];
    conf.status = AWSS3BucketVersioningStatusEnabled;

    AWSS3PutBucketVersioningRequest *versionRequest = [AWSS3PutBucketVersioningRequest new];
    versionRequest.bucket = createBucketReq.bucket;
    versionRequest.versioningConfiguration = conf;

    [[[AWSS3 S3ForKey:key] putBucketVersioning:versionRequest] continueWithBlock:^id(BFTask *task) {

        return task;
}

关于如何创建 AWSS3PutBucketVersioningRequest 请求，我可能遗漏了一个论点，但我找不到任何示例或文档可以为我指明正确的方向。非常欢迎任何关于 Java、Cocoa 或 Swift 的建议。干杯，特隆

更新:

根据评论，我在启用 AWSLogging verbose 后包括了完整的方法和错误输出。

-(BFTask*) enableVersioningOfBucket:(NSString*)bucket region:(NSInteger) region {

    [self setupCredentialsForRegion:region];
    NSString *key = [NSString stringWithFormat:@"regionkey%li",region];

    AWSS3VersioningConfiguration *conf = [AWSS3VersioningConfiguration new];
    conf.status = AWSS3BucketVersioningStatusEnabled;

    AWSS3PutBucketVersioningRequest *versionRequest =  [AWSS3PutBucketVersioningRequest new];
    versionRequest.bucket = bucket;
    versionRequest.versioningConfiguration = conf;
    NSLog(@"Config %@",versionRequest);

   return [[[AWSS3 S3ForKey:key] putBucketVersioning:versionRequest] continueWithBlock:^id(BFTask *task) {
        NSLog(@"Put bucket versioning %@ - %@", task, task.result);
        return task;
    }];
} 

日志消息:

    2015-06-06 12:09:41.822 connectS3[50137:6337899] Config <AWSS3PutBucketVersioningRequest: 0x600000082350> {
    bucket = testbucket;
    versioningConfiguration = "<AWSS3VersioningConfiguration: 0x600000024bc0> {\n    MFADelete = 0;\n    status = 1;\n}";}
    2015-06-06 12:09:41.832 connectS3[50137:6337899] -[NSNull _fastCharacterContents]: unrecognized selector sent to instance 0x7fff7724c210

更新 2

下图显示了当我使用断点并进入每个方法调用时错误消息刚刚出现时的堆栈跟踪。

更新 3 我如下所述设置我的凭据。除了启用版本控制之外，这适用于我连接 S3 的所有其他方法。

        AWSStaticCredentialsProvider *credentialsProvider = [[AWSStaticCredentialsProvider alloc ]
                                                           initWithAccessKey:keychainStore[ACCESS_KEY_ID]
                                                             secretKey:keychainStore[SECRET_KEY]];

        AWSServiceConfiguration *configuration = [[AWSServiceConfiguration alloc] initWithRegion:region
                                                           credentialsProvider:credentialsProvider];

        /* One credential configuration for each region **/
        NSString *key = [NSString stringWithFormat:@"regionkey%li",region];
        [AWSS3 registerS3WithConfiguration:configuration forKey:key];

        /* Default credentialsProvider **/
        [AWSServiceManager defaultServiceManager].defaultServiceConfiguration = configuration;

感谢您的帮助!

最佳答案

我可以确认这是当前 AWS Mobile SDK 中的错误。我们将在未来的版本中修复它。感谢您的报告。

要解决此问题，您可以将以下行添加到您的 AWSS3VersioningConfiguration 代码中:

AWSS3VersioningConfiguration *conf = [AWSS3VersioningConfiguration new];
    conf.status = AWSS3BucketVersioningStatusEnabled;
    conf.MFADelete = AWSS3MFADeleteDisabled; // <------ Add this line
...

关于java - 以编程方式在 AWS S3 上启用版本控制，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/30677529/