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/*
* MinIO Go Library for Amazon S3 Compatible Cloud Storage
* Copyright 2018 MinIO, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package minio
import (
"context"
"encoding/xml"
"net/http"
"net/url"
)
// Grantee represents the person being granted permissions.
type Grantee struct {
XMLName xml.Name `xml:"Grantee"`
ID string `xml:"ID"`
DisplayName string `xml:"DisplayName"`
URI string `xml:"URI"`
}
// Grant holds grant information
type Grant struct {
XMLName xml.Name `xml:"Grant"`
Grantee Grantee
Permission string `xml:"Permission"`
}
// AccessControlList contains the set of grantees and the permissions assigned to each grantee.
type AccessControlList struct {
XMLName xml.Name `xml:"AccessControlList"`
Grant []Grant
Permission string `xml:"Permission"`
}
type accessControlPolicy struct {
XMLName xml.Name `xml:"AccessControlPolicy"`
Owner Owner
AccessControlList AccessControlList
}
// GetObjectACL get object ACLs
func (c *Client) GetObjectACL(ctx context.Context, bucketName, objectName string) (*ObjectInfo, error) {
resp, err := c.executeMethod(ctx, http.MethodGet, requestMetadata{
bucketName: bucketName,
objectName: objectName,
queryValues: url.Values{
"acl": []string{""},
},
})
if err != nil {
return nil, err
}
defer closeResponse(resp)
if resp.StatusCode != http.StatusOK {
return nil, httpRespToErrorResponse(resp, bucketName, objectName)
}
res := &accessControlPolicy{}
if err := xmlDecoder(resp.Body, res); err != nil {
return nil, err
}
objInfo, err := c.StatObject(ctx, bucketName, objectName, StatObjectOptions{})
if err != nil {
return nil, err
}
objInfo.Owner.DisplayName = res.Owner.DisplayName
objInfo.Owner.ID = res.Owner.ID
objInfo.Grant = append(objInfo.Grant, res.AccessControlList.Grant...)
cannedACL := getCannedACL(res)
if cannedACL != "" {
objInfo.Metadata.Add("X-Amz-Acl", cannedACL)
return &objInfo, nil
}
grantACL := getAmzGrantACL(res)
for k, v := range grantACL {
objInfo.Metadata[k] = v
}
return &objInfo, nil
}
func getCannedACL(aCPolicy *accessControlPolicy) string {
grants := aCPolicy.AccessControlList.Grant
switch {
case len(grants) == 1:
if grants[0].Grantee.URI == "" && grants[0].Permission == "FULL_CONTROL" {
return "private"
}
case len(grants) == 2:
for _, g := range grants {
if g.Grantee.URI == "http://acs.amazonaws.com/groups/global/AuthenticatedUsers" && g.Permission == "READ" {
return "authenticated-read"
}
if g.Grantee.URI == "http://acs.amazonaws.com/groups/global/AllUsers" && g.Permission == "READ" {
return "public-read"
}
if g.Permission == "READ" && g.Grantee.ID == aCPolicy.Owner.ID {
return "bucket-owner-read"
}
}
case len(grants) == 3:
for _, g := range grants {
if g.Grantee.URI == "http://acs.amazonaws.com/groups/global/AllUsers" && g.Permission == "WRITE" {
return "public-read-write"
}
}
}
return ""
}
func getAmzGrantACL(aCPolicy *accessControlPolicy) map[string][]string {
grants := aCPolicy.AccessControlList.Grant
res := map[string][]string{}
for _, g := range grants {
switch {
case g.Permission == "READ":
res["X-Amz-Grant-Read"] = append(res["X-Amz-Grant-Read"], "id="+g.Grantee.ID)
case g.Permission == "WRITE":
res["X-Amz-Grant-Write"] = append(res["X-Amz-Grant-Write"], "id="+g.Grantee.ID)
case g.Permission == "READ_ACP":
res["X-Amz-Grant-Read-Acp"] = append(res["X-Amz-Grant-Read-Acp"], "id="+g.Grantee.ID)
case g.Permission == "WRITE_ACP":
res["X-Amz-Grant-Write-Acp"] = append(res["X-Amz-Grant-Write-Acp"], "id="+g.Grantee.ID)
case g.Permission == "FULL_CONTROL":
res["X-Amz-Grant-Full-Control"] = append(res["X-Amz-Grant-Full-Control"], "id="+g.Grantee.ID)
}
}
return res
}
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