How to Execute a Pre-signed POST Upload to AWS S3 in Go
Question:
How can a pre-signed POST be utilized to upload files to an AWS S3 bucket in Go?
Answer:
To accomplish this, follow these steps:
-
Configure S3 Bucket for Public Download:
- Set bucket policy to restrict access to public download only.
-
Create a POST Policy for the Upload:
- Generate a POST policy defining expiration, bucket, key, public-read access, credentials, and date.
-
Generate and Sign the Policy:
- Fill in policy parameters, base64 encode it, and apply HMAC-SHA256 with hex encoding.
-
Construct and POST Multipart Form Data:
- Manually create HTTP POST multipart form data, ensuring fields are in the specified order and adhere to the policy.
Additional Information:
- [Example Web App for Google App Engine Rendering a Pre-signed POST Form](https://github.com/ksnir/go-presigned-post-playground)
- [Library for Pre-signed POST in Go](https://github.com/ksnir/go-presigned-post)
- [AWS S3 Pre-signed POST Uploads Documentation](https://docs.aws.amazon.com/AmazonS3/latest/dev/PresignedPost.html)
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