Pre-Signed POST Upload to AWS S3 Using Go
For secure file upload to AWS S3 buckets, pre-signed POST offers a convenient approach. Here's how to accomplish this in Go:
1. Configure Bucket Access:
Modify your S3 bucket's policy to allow public download:
{ "Version": "2012-10-17", "Id": "akjsdhakshfjlashdf", "Statement": [ { "Sid": "kjahsdkajhsdkjasda", "Effect": "Allow", "Principal": { "AWS": "*" }, "Action": "s3:GetObject", "Resource": "arn:aws:s3:::BUCKETNAMEHERE/*" } ] }
2. Create Pre-Signed POST Policy:
Craft an HTTP POST policy that grants upload permission:
{ "expiration": "%s", "conditions": [ {"bucket": "%s"}, ["starts-with", "$key", "%s"], {"acl": "public-read"}, {"x-amz-credential": "%s"}, {"x-amz-algorithm": "AWS4-HMAC-SHA256"}, {"x-amz-date": "%s" } ] }
Configure the policy with these parameters:
- expiration: Upload expiration time
- bucket: Target S3 bucket name
- key: Name of the file to be uploaded
- credentials: Your AWS credentials
- date: Current date
3. Sign Policy:
Use the S3 bucket owner's credentials to sign the policy:
- Encode the policy using base64
- Compute the HMAC-SHA256 signature
- Encode the signature as a hexadecimal string
4. Construct POST Request:
Generate the multipart form data request:
import "github.com/aws/aws-sdk-go/aws/credentials" type Field struct { Key, Value string } func Upload(url string, fields []Field) error { b := new(bytes.Buffer) w := multipart.NewWriter(b) for _, field := range fields { fw, err := w.CreateFormField(field.Key) if err != nil { return err } if _, err := fw.Write([]byte(field.Value)); err != nil { return err } } w.Close() req, err := http.NewRequest("POST", url, b) if err != nil { return err } req.Header.Set("Content-Type", w.FormDataContentType()) creds := &credentials.StaticProvider{Value: credentials.Value{ AccessKeyID: "AKIAIOSFODNN7EXAMPLE", SecretAccessKey: "wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY", }} cfg := &aws.Config{Credentials: creds} client := new(&http.Client{Transport: &aws.HTTPSHandler{Client: *client, Config: *cfg}}) res, err := client.Do(req) if err != nil { return err } if res.StatusCode != http.StatusOK { return fmt.Errorf("bad status: %s", res.Status) } return nil }
Provide the signed policy fields and the endpoint URL. Your pre-signed POST upload to AWS S3 will then be executed.
The above is the detailed content of How to Implement Pre-Signed POST File Uploads to AWS S3 Using Go?. For more information, please follow other related articles on the PHP Chinese website!

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