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package main
import (
"context"
"fmt"
"log"
"os"
"github.com/aws/aws-sdk-go-v2/aws"
"github.com/aws/aws-sdk-go-v2/config"
"github.com/aws/aws-sdk-go-v2/service/s3"
"github.com/aws/aws-sdk-go-v2/service/s3/types"
)
const (
r2AccountID = "<your-account-id>" // Replace with your Cloudflare R2 Account ID
r2AccessKey = "<your-access-key-id>" // Replace with your Access Key ID
r2SecretKey = "<your-secret-access-key>" // Replace with your Secret Access Key
r2BucketName = "example-bucket" // Replace with your bucket name
r2Endpoint = "https://<account-id>.r2.cloudflarestorage.com" // Replace with your endpoint
)
func main() {
// Initialize the AWS Config for R2
cfg, err := config.LoadDefaultConfig(context.TODO(),
config.WithCredentialsProvider(aws.NewCredentialsCache(
aws.NewStaticCredentialsProvider(r2AccessKey, r2SecretKey, ""),
)),
config.WithEndpointResolver(aws.EndpointResolverWithOptionsFunc(func(service, region string, options ...interface{}) (aws.Endpoint, error) {
return aws.Endpoint{URL: r2Endpoint}, nil
})),
)
if err != nil {
log.Fatalf("Unable to load AWS config: %v", err)
}
// Create the S3 client
client := s3.NewFromConfig(cfg)
// Upload a file
err = uploadFile(client, "example.txt", "example.txt")
if err != nil {
log.Fatalf("Upload failed: %v", err)
}
// Download the file
err = downloadFile(client, "example.txt", "downloaded-example.txt")
if err != nil {
log.Fatalf("Download failed: %v", err)
}
}
// Upload a file to R2
func uploadFile(client *s3.Client, objectKey, filePath string) error {
file, err := os.Open(filePath)
if err != nil {
return fmt.Errorf("failed to open file %s: %w", filePath, err)
}
defer file.Close()
_, err = client.PutObject(context.TODO(), &s3.PutObjectInput{
Bucket: aws.String(r2BucketName),
Key: aws.String(objectKey),
Body: file,
ACL: types.ObjectCannedACLPublicRead, // Optional: Make the file public
})
if err != nil {
return fmt.Errorf("failed to upload file to R2: %w", err)
}
fmt.Printf("File %s uploaded to R2 as %s\n", filePath, objectKey)
return nil
}
// Download a file from R2
func downloadFile(client *s3.Client, objectKey, destPath string) error {
resp, err := client.GetObject(context.TODO(), &s3.GetObjectInput{
Bucket: aws.String(r2BucketName),
Key: aws.String(objectKey),
})
if err != nil {
return fmt.Errorf("failed to download file from R2: %w", err)
}
defer resp.Body.Close()
outFile, err := os.Create(destPath)
if err != nil {
return fmt.Errorf("failed to create file %s: %w", destPath, err)
}
defer outFile.Close()
_, err = outFile.ReadFrom(resp.Body)
if err != nil {
return fmt.Errorf("failed to write file to %s: %w", destPath, err)
}
fmt.Printf("File %s downloaded from R2 and saved as %s\n", objectKey, destPath)
return nil
}
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