我正在實現一個從 s3 存儲桶下載文件的功能。當存儲桶是私有的并且我設置了憑據時，這工作正常os.Setenv("AWS_ACCESS_KEY_ID",?"test")
os.Setenv("AWS_SECRET_ACCESS_KEY",?"test")但是，我按照此處所述公開了 s3 存儲桶，現在我想在沒有憑據的情況下下載它。func DownloadFromS3Bucket(bucket, item, path string) {? ? file, err := os.Create(filepath.Join(path, item))? ? if err != nil {? ? ? ? fmt.Printf("Error in downloading from file: %v \n", err)? ? ? ? os.Exit(1)? ? }? ? defer file.Close()? ? sess, _ := session.NewSession(&aws.Config{? ? ? ? Region: aws.String(constants.AWS_REGION)},? ? )? ? // Create a downloader with the session and custom options? ? downloader := s3manager.NewDownloader(sess, func(d *s3manager.Downloader) {? ? ? ? d.PartSize = 64 * 1024 * 1024 // 64MB per part? ? ? ? d.Concurrency = 6? ? })? ? numBytes, err := downloader.Download(file,? ? ? ? &s3.GetObjectInput{? ? ? ? ? ? Bucket: aws.String(bucket),? ? ? ? ? ? Key:? ? aws.String(item),? ? ? ? })? ? if err != nil {? ? ? ? fmt.Printf("Error in downloading from file: %v \n", err)? ? ? ? os.Exit(1)? ? }? ? fmt.Println("Download completed", file.Name(), numBytes, "bytes")}但是現在我遇到了一個錯誤。Error in downloading from file: NoCredentialProviders: no valid providers in chain. Deprecated.? ? For verbose messaging see aws.Config.CredentialsChainVerboseErrors知道如何在沒有憑據的情況下下載它嗎？
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我們可以在創建session的時候設置Credentials: credentials.AnonymousCredentials。以下是工作代碼。
func DownloadFromS3Bucket(bucket, item, path string) {
file, err := os.Create(filepath.Join(path, item))
if err != nil {
fmt.Printf("Error in downloading from file: %v \n", err)
os.Exit(1)
}
defer file.Close()
sess, _ := session.NewSession(&aws.Config{
Region: aws.String(constants.AWS_REGION), Credentials: credentials.AnonymousCredentials},
)
// Create a downloader with the session and custom options
downloader := s3manager.NewDownloader(sess, func(d *s3manager.Downloader) {
d.PartSize = 64 * 1024 * 1024 // 64MB per part
d.Concurrency = 6
})
numBytes, err := downloader.Download(file,
&s3.GetObjectInput{
Bucket: aws.String(bucket),
Key: aws.String(item),
})
if err != nil {
fmt.Printf("Error in downloading from file: %v \n", err)
os.Exit(1)
}
fmt.Println("Download completed", file.Name(), numBytes, "bytes")
}
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