# S3Presign
<a name="API_S3Presign"></a>

This object defines the access restrictions to Amazon S3 resources that are included in custom worker task templates using the Liquid filter, `grant_read_access`.

To learn more about how custom templates are created, see [Create custom worker task templates](https://docs.aws.amazon.com/sagemaker/latest/dg/a2i-custom-templates.html).

## Contents
<a name="API_S3Presign_Contents"></a>

 ** IamPolicyConstraints **   <a name="sagemaker-Type-S3Presign-IamPolicyConstraints"></a>
Use this parameter to specify the allowed request source. Possible sources are either `SourceIp` or `VpcSourceIp`.  
Type: [IamPolicyConstraints](API_IamPolicyConstraints.md) object  
Required: No

## See Also
<a name="API_S3Presign_SeeAlso"></a>

For more information about using this API in one of the language-specific AWS SDKs, see the following:
+  [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/sagemaker-2017-07-24/S3Presign) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/sagemaker-2017-07-24/S3Presign) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/sagemaker-2017-07-24/S3Presign)