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access.go
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access.go
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// Package apc: API messages and constants
/*
* Copyright (c) 2018-2022, NVIDIA CORPORATION. All rights reserved.
*/
package apc
import (
"fmt"
"strconv"
"strings"
)
type AccessAttrs uint64
// ACL aka access permissions
const (
// object level
AceGET = AccessAttrs(1) << iota
AceObjHEAD // permission to get object props
AcePUT
AceAPPEND
AceObjDELETE
AceObjMOVE
AcePromote
// permission to overwrite objects that were previously read from:
// a) any remote backend that is currently not configured as the bucket's backend
// b) HTPP ("ht://") since it's not writable
AceDisconnectedBackend
// bucket metadata
AceBckHEAD // get bucket props and ACL
AceObjLIST // list objects in a bucket
AcePATCH // set bucket props
AceBckSetACL // set bucket permissions
// cluster level
AceListBuckets
AceShowCluster
AceCreateBucket
AceDestroyBucket
AceMoveBucket
AceAdmin
// note: must be the last one
AceMax
)
// access => operation
var accessOp = map[AccessAttrs]string{
// object
AceGET: "GET",
AceObjHEAD: "HEAD-OBJECT",
AcePUT: "PUT",
AceAPPEND: "APPEND",
AceObjDELETE: "DELETE-OBJECT",
AceObjMOVE: "MOVE-OBJECT",
AcePromote: "PROMOTE",
AceDisconnectedBackend: "DISCONNECTED-BACKEND",
// bucket
AceBckHEAD: "HEAD-BUCKET",
AceObjLIST: "LIST-OBJECTS",
AcePATCH: "PATCH",
AceBckSetACL: "SET-BUCKET-ACL",
// cluster
AceListBuckets: "LIST-BUCKETS",
AceShowCluster: "SHOW-CLUSTER",
AceCreateBucket: "CREATE-BUCKET",
AceDestroyBucket: "DESTROY-BUCKET",
AceMoveBucket: "MOVE-BUCKET",
AceAdmin: "ADMIN",
// NOTE: update Describe() when adding/deleting
}
// derived (convenience) constants
const (
// encompasses all ACEs, current and future
AccessAll = AccessAttrs(^uint64(0))
AllowAllAccess = "su"
// read-only and read-write access to bucket
AccessRO = AceGET | AceObjHEAD | AceListBuckets | AceBckHEAD | AceObjLIST
AllowReadOnlyAccess = "ro"
AccessRW = AccessRO | AcePUT | AceAPPEND | AceObjDELETE | AceObjMOVE
AllowReadWriteAccess = "rw"
AccessNone = AccessAttrs(0)
// permission to perform cluster-level ops
AccessCluster = AceListBuckets | AceCreateBucket | AceDestroyBucket | AceMoveBucket | AceAdmin
)
// verbs
func SupportedPermissions() []string {
accList := []string{"ro", "rw", "su"}
for _, v := range accessOp {
accList = append(accList, v)
}
return accList
}
func (a AccessAttrs) Has(perms AccessAttrs) bool { return a&perms == perms }
func (a AccessAttrs) String() string { return strconv.FormatUint(uint64(a), 10) }
func (a AccessAttrs) Describe() string {
if a == 0 {
return "No access"
}
accList := make([]string, 0, 24)
if a.Has(AceGET) {
accList = append(accList, accessOp[AceGET])
}
if a.Has(AceObjHEAD) {
accList = append(accList, accessOp[AceObjHEAD])
}
if a.Has(AcePUT) {
accList = append(accList, accessOp[AcePUT])
}
if a.Has(AceAPPEND) {
accList = append(accList, accessOp[AceAPPEND])
}
if a.Has(AceObjDELETE) {
accList = append(accList, accessOp[AceObjDELETE])
}
if a.Has(AceObjMOVE) {
accList = append(accList, accessOp[AceObjMOVE])
}
if a.Has(AcePromote) {
accList = append(accList, accessOp[AcePromote])
}
if a.Has(AceDisconnectedBackend) {
accList = append(accList, accessOp[AceDisconnectedBackend])
}
//
if a.Has(AceBckHEAD) {
accList = append(accList, accessOp[AceBckHEAD])
}
if a.Has(AceObjLIST) {
accList = append(accList, accessOp[AceObjLIST])
}
if a.Has(AcePATCH) {
accList = append(accList, accessOp[AcePATCH])
}
if a.Has(AceBckSetACL) {
accList = append(accList, accessOp[AceBckSetACL])
}
//
if a.Has(AceListBuckets) {
accList = append(accList, accessOp[AceListBuckets])
}
if a.Has(AceShowCluster) {
accList = append(accList, accessOp[AceShowCluster])
}
if a.Has(AceCreateBucket) {
accList = append(accList, accessOp[AceCreateBucket])
}
if a.Has(AceDestroyBucket) {
accList = append(accList, accessOp[AceDestroyBucket])
}
if a.Has(AceMoveBucket) {
accList = append(accList, accessOp[AceMoveBucket])
}
if a.Has(AceAdmin) {
accList = append(accList, accessOp[AceAdmin])
}
return strings.Join(accList, ",")
}
func AccessOp(access AccessAttrs) string {
if s, ok := accessOp[access]; ok {
return s
}
return "<unknown access>"
}
func StrToAccess(accessStr string) (access AccessAttrs, err error) {
switch accessStr {
case AllowReadOnlyAccess:
access |= AccessRO
case AllowReadWriteAccess:
access |= AccessRW
case AllowAllAccess:
access = AccessAll
case "":
access = AccessNone
default:
found := false
for k, v := range accessOp {
if v == accessStr {
access |= k
found = true
}
}
if !found {
err = fmt.Errorf("invalid access value: %q", accessStr)
}
}
return
}