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141 lines
3.5 KiB
Go
141 lines
3.5 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 policy
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import (
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"encoding/json"
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"strings"
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"github.com/minio/minio/pkg/bucket/policy/condition"
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"github.com/minio/minio/pkg/wildcard"
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)
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// ResourceARNPrefix - resource ARN prefix as per AWS S3 specification.
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const ResourceARNPrefix = "arn:aws:s3:::"
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// Resource - resource in policy statement.
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type Resource struct {
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BucketName string
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Pattern string
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}
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func (r Resource) isBucketPattern() bool {
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return !strings.Contains(r.Pattern, "/")
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}
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func (r Resource) isObjectPattern() bool {
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return strings.Contains(r.Pattern, "/") || strings.Contains(r.BucketName, "*")
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}
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// IsValid - checks whether Resource is valid or not.
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func (r Resource) IsValid() bool {
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return r.BucketName != "" && r.Pattern != ""
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}
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// Match - matches object name with resource pattern.
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func (r Resource) Match(resource string, conditionValues map[string][]string) bool {
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pattern := r.Pattern
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for _, key := range condition.CommonKeys {
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// Empty values are not supported for policy variables.
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if rvalues, ok := conditionValues[key.Name()]; ok && rvalues[0] != "" {
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pattern = strings.Replace(pattern, key.VarName(), rvalues[0], -1)
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}
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}
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return wildcard.Match(pattern, resource)
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}
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// MarshalJSON - encodes Resource to JSON data.
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func (r Resource) MarshalJSON() ([]byte, error) {
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if !r.IsValid() {
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return nil, Errorf("invalid resource %v", r)
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}
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return json.Marshal(r.String())
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}
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func (r Resource) String() string {
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return ResourceARNPrefix + r.Pattern
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}
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// UnmarshalJSON - decodes JSON data to Resource.
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func (r *Resource) UnmarshalJSON(data []byte) error {
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var s string
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if err := json.Unmarshal(data, &s); err != nil {
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return err
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}
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parsedResource, err := parseResource(s)
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if err != nil {
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return err
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}
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*r = parsedResource
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return nil
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}
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// Validate - validates Resource is for given bucket or not.
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func (r Resource) Validate(bucketName string) error {
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if !r.IsValid() {
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return Errorf("invalid resource")
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}
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if !wildcard.Match(r.BucketName, bucketName) {
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return Errorf("bucket name does not match")
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}
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return nil
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}
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// parseResource - parses string to Resource.
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func parseResource(s string) (Resource, error) {
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if !strings.HasPrefix(s, ResourceARNPrefix) {
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return Resource{}, Errorf("invalid resource '%v'", s)
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}
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pattern := strings.TrimPrefix(s, ResourceARNPrefix)
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tokens := strings.SplitN(pattern, "/", 2)
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bucketName := tokens[0]
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if bucketName == "" {
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return Resource{}, Errorf("invalid resource format '%v'", s)
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}
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return Resource{
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BucketName: bucketName,
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Pattern: pattern,
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}, nil
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}
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// NewResource - creates new resource.
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func NewResource(bucketName, keyName string) Resource {
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pattern := bucketName
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if keyName != "" {
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if !strings.HasPrefix(keyName, "/") {
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pattern += "/"
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}
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pattern += keyName
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}
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return Resource{
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BucketName: bucketName,
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Pattern: pattern,
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}
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}
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