forked from minio/minio
/
destination.go
136 lines (117 loc) · 4.03 KB
/
destination.go
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// Copyright (c) 2015-2021 MinIO, Inc.
//
// This file is part of MinIO Object Storage stack
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package replication
import (
"encoding/xml"
"fmt"
"strings"
"github.com/minio/pkg/v2/wildcard"
)
// DestinationARNPrefix - destination ARN prefix as per AWS S3 specification.
const DestinationARNPrefix = "arn:aws:s3:::"
// DestinationARNMinIOPrefix - destination ARN prefix for MinIO.
const DestinationARNMinIOPrefix = "arn:minio:replication:"
// Destination - destination in ReplicationConfiguration.
type Destination struct {
XMLName xml.Name `xml:"Destination" json:"Destination"`
Bucket string `xml:"Bucket" json:"Bucket"`
StorageClass string `xml:"StorageClass" json:"StorageClass"`
ARN string
// EncryptionConfiguration TODO: not needed for MinIO
}
func (d Destination) isValidStorageClass() bool {
if d.StorageClass == "" {
return true
}
return d.StorageClass == "STANDARD" || d.StorageClass == "REDUCED_REDUNDANCY"
}
// IsValid - checks whether Destination is valid or not.
func (d Destination) IsValid() bool {
return d.Bucket != "" || !d.isValidStorageClass()
}
func (d Destination) String() string {
return d.ARN
}
// LegacyArn returns true if arn format has prefix "arn:aws:s3:::" which was
// used prior to multi-destination
func (d Destination) LegacyArn() bool {
return strings.HasPrefix(d.ARN, DestinationARNPrefix)
}
// TargetArn returns true if arn format has prefix "arn:minio:replication:::"
// used for multi-destination targets
func (d Destination) TargetArn() bool {
return strings.HasPrefix(d.ARN, DestinationARNMinIOPrefix)
}
// MarshalXML - encodes to XML data.
func (d Destination) MarshalXML(e *xml.Encoder, start xml.StartElement) error {
if err := e.EncodeToken(start); err != nil {
return err
}
if err := e.EncodeElement(d.String(), xml.StartElement{Name: xml.Name{Local: "Bucket"}}); err != nil {
return err
}
if d.StorageClass != "" {
if err := e.EncodeElement(d.StorageClass, xml.StartElement{Name: xml.Name{Local: "StorageClass"}}); err != nil {
return err
}
}
return e.EncodeToken(xml.EndElement{Name: start.Name})
}
// UnmarshalXML - decodes XML data.
func (d *Destination) UnmarshalXML(dec *xml.Decoder, start xml.StartElement) (err error) {
// Make subtype to avoid recursive UnmarshalXML().
type destination Destination
dest := destination{}
if err := dec.DecodeElement(&dest, &start); err != nil {
return err
}
parsedDest, err := parseDestination(dest.Bucket)
if err != nil {
return err
}
if dest.StorageClass != "" {
switch dest.StorageClass {
case "STANDARD", "REDUCED_REDUNDANCY":
default:
return fmt.Errorf("unknown storage class %s", dest.StorageClass)
}
}
parsedDest.StorageClass = dest.StorageClass
*d = parsedDest
return nil
}
// Validate - validates Resource is for given bucket or not.
func (d Destination) Validate(bucketName string) error {
if !d.IsValid() {
return Errorf("invalid destination")
}
if !wildcard.Match(d.Bucket, bucketName) {
return Errorf("bucket name does not match")
}
return nil
}
// parseDestination - parses string to Destination.
func parseDestination(s string) (Destination, error) {
if !strings.HasPrefix(s, DestinationARNPrefix) && !strings.HasPrefix(s, DestinationARNMinIOPrefix) {
return Destination{}, Errorf("invalid destination '%s'", s)
}
bucketName := strings.TrimPrefix(s, DestinationARNPrefix)
return Destination{
Bucket: bucketName,
ARN: s,
}, nil
}