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