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146 lines
3.6 KiB
Go
146 lines
3.6 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 arn
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import (
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"fmt"
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"regexp"
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"strings"
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)
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// ARN structure:
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//
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// arn:partition:service:region:account-id:resource-type/resource-id
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//
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// In this implementation, account-id is empty.
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//
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// Reference: https://docs.aws.amazon.com/general/latest/gr/aws-arns-and-namespaces.html
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type arnPartition string
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const (
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arnPartitionMinio arnPartition = "minio"
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)
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type arnService string
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const (
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arnServiceIAM arnService = "iam"
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)
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type arnResourceType string
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const (
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arnResourceTypeRole arnResourceType = "role"
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)
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// ARN - representation of resources based on AWS ARNs.
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type ARN struct {
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Partition arnPartition
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Service arnService
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Region string
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ResourceType arnResourceType
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ResourceID string
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}
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// Allows english letters, numbers, '.', '-', '_' and '/'. Starts with a
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// letter or digit. At least 1 character long.
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var validResourceIDRegex = regexp.MustCompile(`^[A-Za-z0-9][A-Za-z0-9_/\.-]*$`)
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// NewIAMRoleARN - returns an ARN for a role in MinIO.
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func NewIAMRoleARN(resourceID, serverRegion string) (ARN, error) {
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if !validResourceIDRegex.MatchString(resourceID) {
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return ARN{}, fmt.Errorf("Invalid resource ID: %s", resourceID)
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}
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return ARN{
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Partition: arnPartitionMinio,
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Service: arnServiceIAM,
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Region: serverRegion,
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ResourceType: arnResourceTypeRole,
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ResourceID: resourceID,
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}, nil
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}
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// String - returns string representation of the ARN.
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func (arn ARN) String() string {
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return strings.Join(
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[]string{
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"arn",
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string(arn.Partition),
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string(arn.Service),
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arn.Region,
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"", // account-id is always empty in this implementation
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string(arn.ResourceType) + "/" + arn.ResourceID,
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},
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":",
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)
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}
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// Parse - parses an ARN string into a type.
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func Parse(arnStr string) (arn ARN, err error) {
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ps := strings.Split(arnStr, ":")
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if len(ps) != 6 ||
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ps[0] != "arn" {
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err = fmt.Errorf("Invalid ARN string format")
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return
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}
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if ps[1] != string(arnPartitionMinio) {
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err = fmt.Errorf("Invalid ARN - bad partition field")
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return
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}
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if ps[2] != string(arnServiceIAM) {
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err = fmt.Errorf("Invalid ARN - bad service field")
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return
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}
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// ps[3] is region and is not validated here. If the region is invalid,
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// the ARN would not match any configured ARNs in the server.
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if ps[4] != "" {
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err = fmt.Errorf("Invalid ARN - unsupported account-id field")
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return
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}
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res := strings.SplitN(ps[5], "/", 2)
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if len(res) != 2 {
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err = fmt.Errorf("Invalid ARN - resource does not contain a \"/\"")
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return
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}
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if res[0] != string(arnResourceTypeRole) {
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err = fmt.Errorf("Invalid ARN: resource type is invalid.")
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return
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}
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if !validResourceIDRegex.MatchString(res[1]) {
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err = fmt.Errorf("Invalid resource ID: %s", res[1])
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return
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}
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arn = ARN{
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Partition: arnPartitionMinio,
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Service: arnServiceIAM,
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Region: ps[3],
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ResourceType: arnResourceTypeRole,
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ResourceID: res[1],
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}
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return
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}
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