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minio/cmd/bucket-policy.go

193 lines
5.4 KiB

/*
* Minio Cloud Storage, (C) 2015, 2016 Minio, Inc.
*
* 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.
*/
package cmd
import (
"bytes"
"errors"
"io"
"path"
"sync"
)
// Variable represents bucket policies in memory.
var globalBucketPolicies *bucketPolicies
// Global bucket policies list, policies are enforced on each bucket looking
// through the policies here.
type bucketPolicies struct {
rwMutex *sync.RWMutex
// Collection of 'bucket' policies.
bucketPolicyConfigs map[string]*bucketPolicy
}
// Fetch bucket policy for a given bucket.
func (bp bucketPolicies) GetBucketPolicy(bucket string) *bucketPolicy {
bp.rwMutex.RLock()
defer bp.rwMutex.RUnlock()
return bp.bucketPolicyConfigs[bucket]
}
// Set a new bucket policy for a bucket, this operation will overwrite
// any previous bucketpolicies for the bucket.
func (bp *bucketPolicies) SetBucketPolicy(bucket string, policy *bucketPolicy) error {
bp.rwMutex.Lock()
defer bp.rwMutex.Unlock()
if policy == nil {
return errors.New("invalid argument")
}
bp.bucketPolicyConfigs[bucket] = policy
return nil
}
// Remove bucket policy for a bucket, from in-memory map.
func (bp *bucketPolicies) RemoveBucketPolicy(bucket string) {
bp.rwMutex.Lock()
defer bp.rwMutex.Unlock()
delete(bp.bucketPolicyConfigs, bucket)
}
// Loads all bucket policies from persistent layer.
func loadAllBucketPolicies(objAPI ObjectLayer) (policies map[string]*bucketPolicy, err error) {
// List buckets to proceed loading all notification configuration.
buckets, err := objAPI.ListBuckets()
if err != nil {
return nil, err
}
policies = make(map[string]*bucketPolicy)
// Loads bucket policy.
for _, bucket := range buckets {
var policy *bucketPolicy
policy, err = readBucketPolicy(bucket.Name, objAPI)
if err != nil {
switch err.(type) {
case BucketPolicyNotFound:
continue
}
return nil, err
}
policies[bucket.Name] = policy
}
// Success.
return policies, nil
}
// Intialize all bucket policies.
func initBucketPolicies(objAPI ObjectLayer) error {
if objAPI == nil {
return errInvalidArgument
}
// Read all bucket policies.
policies, err := loadAllBucketPolicies(objAPI)
if err != nil {
return err
}
globalBucketPolicies = &bucketPolicies{
rwMutex: &sync.RWMutex{},
bucketPolicyConfigs: policies,
}
return nil
}
// getOldBucketsConfigPath - get old buckets config path. (Only used for migrating old bucket policies)
func getOldBucketsConfigPath() (string, error) {
configPath, err := getConfigPath()
if err != nil {
return "", err
}
return path.Join(configPath, "buckets"), nil
}
// readBucketPolicyJSON - reads bucket policy for an input bucket, returns BucketPolicyNotFound
// if bucket policy is not found.
func readBucketPolicyJSON(bucket string, objAPI ObjectLayer) (bucketPolicyReader io.Reader, err error) {
// Verify bucket is valid.
if !IsValidBucketName(bucket) {
return nil, BucketNameInvalid{Bucket: bucket}
}
policyPath := pathJoin(bucketConfigPrefix, bucket, policyJSON)
objInfo, err := objAPI.GetObjectInfo(minioMetaBucket, policyPath)
if err != nil {
if _, ok := err.(ObjectNotFound); ok {
return nil, BucketPolicyNotFound{Bucket: bucket}
}
return nil, err
}
var buffer bytes.Buffer
err = objAPI.GetObject(minioMetaBucket, policyPath, 0, objInfo.Size, &buffer)
if err != nil {
if _, ok := err.(ObjectNotFound); ok {
return nil, BucketPolicyNotFound{Bucket: bucket}
}
return nil, err
}
return &buffer, nil
}
// readBucketPolicy - reads bucket policy for an input bucket, returns BucketPolicyNotFound
// if bucket policy is not found. This function also parses the bucket policy into an object.
func readBucketPolicy(bucket string, objAPI ObjectLayer) (*bucketPolicy, error) {
// Read bucket policy JSON.
bucketPolicyReader, err := readBucketPolicyJSON(bucket, objAPI)
if err != nil {
return nil, err
}
// Parse the saved policy.
var policy = &bucketPolicy{}
err = parseBucketPolicy(bucketPolicyReader, policy)
if err != nil {
return nil, err
}
return policy, nil
}
// removeBucketPolicy - removes any previously written bucket policy. Returns BucketPolicyNotFound
// if no policies are found.
func removeBucketPolicy(bucket string, objAPI ObjectLayer) error {
// Verify bucket is valid.
if !IsValidBucketName(bucket) {
return BucketNameInvalid{Bucket: bucket}
}
policyPath := pathJoin(bucketConfigPrefix, bucket, policyJSON)
if err := objAPI.DeleteObject(minioMetaBucket, policyPath); err != nil {
if _, ok := err.(ObjectNotFound); ok {
return BucketPolicyNotFound{Bucket: bucket}
}
return err
}
return nil
}
// writeBucketPolicy - save all bucket policies.
func writeBucketPolicy(bucket string, objAPI ObjectLayer, reader io.Reader, size int64) error {
// Verify if bucket path legal
if !IsValidBucketName(bucket) {
return BucketNameInvalid{Bucket: bucket}
}
policyPath := pathJoin(bucketConfigPrefix, bucket, policyJSON)
_, err := objAPI.PutObject(minioMetaBucket, policyPath, size, reader, nil)
return err
}