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permissions.go
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permissions.go
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// Copyright 2020 CERN
//
// 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.
//
// In applying this license, CERN does not waive the privileges and immunities
// granted to it by virtue of its status as an Intergovernmental Organization
// or submit itself to any jurisdiction.
package conversions
import (
"fmt"
)
// Permissions reflects the CRUD permissions used in the OCS sharing API
type Permissions uint
const (
// PermissionInvalid represents an invalid permission
PermissionInvalid Permissions = 0
// PermissionRead grants read permissions on a resource
PermissionRead Permissions = 1 << (iota - 1)
// PermissionWrite grants write permissions on a resource
PermissionWrite
// PermissionCreate grants create permissions on a resource
PermissionCreate
// PermissionDelete grants delete permissions on a resource
PermissionDelete
// PermissionShare grants share permissions on a resource
PermissionShare
// PermissionDeny grants permissions to deny access on a resource
// The recipient of the resource will then have PermissionNone.
PermissionDeny
// PermissionNone grants no permissions on a resource
PermissionNone
// PermissionMax is to be used within value range checks
PermissionMax Permissions = (1 << (iota - 1)) - 1
// PermissionAll grants all permissions on a resource
PermissionAll = PermissionMax - PermissionNone
// PermissionMin is to be used within value range checks
PermissionMin = PermissionRead
)
var (
// ErrPermissionNotInRange defines a permission specific error.
ErrPermissionNotInRange = fmt.Errorf("The provided permission is not between %d and %d", PermissionMin, PermissionMax)
)
// NewPermissions creates a new Permissions instance.
// The value must be in the valid range.
func NewPermissions(val int) (Permissions, error) {
if val == int(PermissionInvalid) {
return PermissionInvalid, fmt.Errorf("permissions %d out of range %d - %d", val, PermissionMin, PermissionMax)
} else if val < int(PermissionInvalid) || int(PermissionMax) < val {
return PermissionInvalid, ErrPermissionNotInRange
}
return Permissions(val), nil
}
// Contain tests if the permissions contain another one.
func (p Permissions) Contain(other Permissions) bool {
return p&other == other
}