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