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s3.go
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s3.go
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package xfer
import (
"context"
"fmt"
"io"
"net/url"
"os"
"strings"
"github.com/aws/aws-sdk-go-v2/aws"
"github.com/aws/aws-sdk-go-v2/config"
"github.com/aws/aws-sdk-go-v2/feature/s3/manager"
"github.com/aws/aws-sdk-go-v2/service/s3"
)
func GetS3ReadCloser(uri string) (io.ReadCloser, error) {
parsedUri, _ := url.Parse(uri)
// Assuming ~/.aws/credentials:
// [default]
// aws_access_key_id=AKIA...
// aws_secret_access_key=...
// ~/.aws/config
// [default]
// region=us-east-1
// output=json
cfg, err := config.LoadDefaultConfig(context.TODO())
if err != nil {
return nil, err
}
client := s3.NewFromConfig(cfg)
// client := s3.New(s3.Options{
// Region: "us-east-1",
// Credentials: aws.NewCredentialsCache(credentials.NewStaticCredentialsProvider("AK...", "...", "")),
// })
resp, err := client.GetObject(context.TODO(), &s3.GetObjectInput{
Bucket: aws.String(parsedUri.Host),
Key: aws.String(strings.TrimLeft(parsedUri.Path, "/")),
})
if err != nil {
return nil, err
}
return resp.Body, nil
}
func readS3File(uri string) ([]byte, error) {
r, err := GetS3ReadCloser(uri)
if err != nil {
return nil, err
}
defer r.Close()
bytes, err := io.ReadAll(r)
if err != nil {
return nil, fmt.Errorf("cannot read body of %s, bad status: %s", uri, err.Error())
}
return bytes, nil
}
func UploadS3File(srcPath string, u *url.URL) error {
f, err := os.Open(srcPath)
if err != nil {
return err
}
defer f.Close()
cfg, err := config.LoadDefaultConfig(context.TODO())
if err != nil {
return err
}
client := s3.NewFromConfig(cfg)
uploader := manager.NewUploader(client)
_, err = uploader.Upload(context.TODO(), &s3.PutObjectInput{
Bucket: aws.String(u.Host),
Key: aws.String(strings.TrimLeft(u.Path, "/")),
Body: f,
})
if err != nil {
return err
}
return nil
}