The aws s3 presign command is a part of the AWS Command Line Interface (CLI) and is used to generate pre-signed URLs for Amazon S3 objects. A pre-signed URL is a time-limited URL that grants temporary access to an S3 object, allowing secure and controlled sharing of the object with others.
Here’s an overview of the aws s3 presign command and its functionality:
- Generating Pre-signed URLs: The primary purpose of the aws s3 presign command is to generate pre-signed URLs for S3 objects. You specify the S3 bucket name, the object key, and an optional expiration time for the URL.
- Temporary Access: The pre-signed URL generated by the aws s3 presign command grants temporary access to the S3 object. When someone accesses the URL within the specified expiration time, they are able to download or interact with the object directly from S3.
- Expiration Time: You can specify an expiration time for the pre-signed URL using the –expires-in or –expires-at option. This allows you to control the duration for which the URL is valid and enforce time-limited access to the S3 object.
- Access Control: The pre-signed URL inherits the access permissions of the IAM user or role used to generate it. This means that anyone who has the pre-signed URL will have the same level of access to the S3 object as the IAM user or role that generated the URL.
- Secure Sharing: Pre-signed URLs are commonly used when you want to securely share private S3 objects with specific individuals or entities. You can generate a pre-signed URL and provide it to the intended recipients, who can then access the object without requiring their own AWS credentials.
- Use Cases: Pre-signed URLs have various use cases, such as temporary file downloads, time-limited access to private content, sharing files with external parties, or providing temporary access for automated processes or applications.
The aws s3 presign command provides a straightforward way to generate pre-signed URLs for Amazon S3 objects. It gives you fine-grained control over the access and duration of the URL, allowing you to securely share S3 objects with others without requiring them to have direct AWS credentials.
aws s3 presign Command Examples
1. Generate a pre-signed URL for a specific S3 object that is valid for one hour:
# aws s3 presign s3://bucket_name/path/to/file
2. Generate a pre-signed URL valid for a specific lifetime:
# aws s3 presign s3://bucket_name/path/to/file --expires-in duration_in_seconds
3. Display help:
# aws s3 presign help