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storage_presign.go
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storage_presign.go
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package cmd
import (
"fmt"
"strings"
"time"
"github.com/aws/aws-sdk-go-v2/aws"
v4 "github.com/aws/aws-sdk-go-v2/aws/signer/v4"
"github.com/aws/aws-sdk-go-v2/service/s3"
"github.com/spf13/cobra"
)
var storagePresignCmd = &cobra.Command{
Use: "presign sos://BUCKET/OBJECT",
Short: "Generate a pre-signed URL to an object",
PreRunE: func(cmd *cobra.Command, args []string) error {
if len(args) != 1 {
cmdExitOnUsageError(cmd, "invalid arguments")
}
args[0] = strings.TrimPrefix(args[0], storageBucketPrefix)
return nil
},
RunE: func(cmd *cobra.Command, args []string) error {
var (
bucket string
key string
)
certsFile, err := cmd.Flags().GetString("certs-file")
if err != nil {
return err
}
expires, err := cmd.Flags().GetDuration("expires")
if err != nil {
return err
}
method, err := cmd.Flags().GetString("method")
if err != nil {
return err
}
parts := strings.SplitN(args[0], "/", 2)
bucket, key = parts[0], parts[1]
storage, err := newStorageClient(
storageClientOptWithCertsFile(certsFile),
storageClientOptZoneFromBucket(bucket),
)
if err != nil {
return fmt.Errorf("unable to initialize storage client: %v", err)
}
url, err := storage.genPresignedURL(method, bucket, key, expires)
if err != nil {
return fmt.Errorf("unable to pre-sign %s%s/%s: %s", storageBucketPrefix, bucket, key, err)
}
fmt.Println(url)
return nil
},
}
func init() {
storagePresignCmd.Flags().StringP("method", "m", "get", "pre-signed URL method (get|put)")
storagePresignCmd.Flags().DurationP("expires", "e", 900*time.Second,
`expiration duration for the generated pre-signed URL (e.g. "1h45m", "30s"); supported units: "s", "m", "h"`)
storageCmd.AddCommand(storagePresignCmd)
}
func (c *storageClient) genPresignedURL(method, bucket, key string, expires time.Duration) (string, error) {
var (
psURL *v4.PresignedHTTPRequest
err error
)
psClient := s3.NewPresignClient(c.Client, func(o *s3.PresignOptions) {
if expires > 0 {
o.Expires = expires
}
})
switch method {
case "get":
psURL, err = psClient.PresignGetObject(gContext, &s3.GetObjectInput{
Bucket: aws.String(bucket),
Key: aws.String(key),
})
case "put":
psURL, err = psClient.PresignPutObject(gContext, &s3.PutObjectInput{
Bucket: aws.String(bucket),
Key: aws.String(key),
})
default:
err = fmt.Errorf("unsupported method %q", method)
}
if err != nil {
return "", err
}
return psURL.URL, nil
}