使用适用于iOS的Amazon S3 Transfer Utility设置元数据

Question

I can't find a way to set metadata using this library: Amazon S3 Transfer Utility for iOS

Is there a way to achieve this?

Answer 1

You can use - setValue:forRequestParameter: on AWSS3TransferUtilityExpression to add metadata.

Note Amazon S3 stores user-defined metadata in lowercase. Each name, value pair must conform to US-ASCII.

Answer 2

You can assign user-defined metadata to an object. User-defined metadata must begin with the prefix "x-amz-meta-", otherwise Amazon S3 will not set the key value pair as you define it. You define custom metadata by adding a name that you choose to the x-amz-meta- key. This creates a custom key. For example, if you add the custom name alt-name, the metadata key would be x-amz-meta-alt-name.

You can refer this link : https://docs.aws.amazon.com/AmazonS3/latest/user-guide/add-object-metadata.html#add-object-metadata-user-defined

  var uploadCompletion: AWSS3TransferUtilityUploadCompletionHandlerBlock?
    uploadCompletion = { (uploadTask, error) in
        if error == nil {
            completion(nil)
        } else {
            completion(error)
        }
    }

    let expression = AWSS3TransferUtilityUploadExpression()
//YOUR METADATA HERE
    expression.setValue("value", forRequestParameter: "x-amz-meta-yourkeyhere")

    let transferUtility = AWSS3TransferUtility.default()
    transferUtility.uploadData(data,
                               bucket: s3BucketName,
                               key: key,
                               contentType: "image/png",
                               expression: expression,
                               completionHandler: uploadCompletion)