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/*
* Minio Go Library for Amazon S3 Compatible Cloud Storage
* Copyright 2015-2017 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 minio
import (
"context"
"encoding/json"
"io/ioutil"
"net/http"
"net/url"
"github.com/minio/minio-go/pkg/policy"
"github.com/minio/minio-go/pkg/s3utils"
)
// GetBucketPolicy - get bucket policy at a given path.
func (c Client) GetBucketPolicy(bucketName, objectPrefix string) (bucketPolicy policy.BucketPolicy, err error) {
// Input validation.
if err := s3utils.CheckValidBucketName(bucketName); err != nil {
return policy.BucketPolicyNone, err
}
if err := s3utils.CheckValidObjectNamePrefix(objectPrefix); err != nil {
return policy.BucketPolicyNone, err
}
policyInfo, err := c.getBucketPolicy(bucketName)
if err != nil {
errResponse := ToErrorResponse(err)
if errResponse.Code == "NoSuchBucketPolicy" {
return policy.BucketPolicyNone, nil
}
return policy.BucketPolicyNone, err
}
return policy.GetPolicy(policyInfo.Statements, bucketName, objectPrefix), nil
}
// ListBucketPolicies - list all policies for a given prefix and all its children.
func (c Client) ListBucketPolicies(bucketName, objectPrefix string) (bucketPolicies map[string]policy.BucketPolicy, err error) {
// Input validation.
if err := s3utils.CheckValidBucketName(bucketName); err != nil {
return map[string]policy.BucketPolicy{}, err
}
if err := s3utils.CheckValidObjectNamePrefix(objectPrefix); err != nil {
return map[string]policy.BucketPolicy{}, err
}
policyInfo, err := c.getBucketPolicy(bucketName)
if err != nil {
errResponse := ToErrorResponse(err)
if errResponse.Code == "NoSuchBucketPolicy" {
return map[string]policy.BucketPolicy{}, nil
}
return map[string]policy.BucketPolicy{}, err
}
return policy.GetPolicies(policyInfo.Statements, bucketName), nil
}
// Default empty bucket access policy.
var emptyBucketAccessPolicy = policy.BucketAccessPolicy{
Version: "2012-10-17",
}
// Request server for current bucket policy.
func (c Client) getBucketPolicy(bucketName string) (policy.BucketAccessPolicy, error) {
// Get resources properly escaped and lined up before
// using them in http request.
urlValues := make(url.Values)
urlValues.Set("policy", "")
// Execute GET on bucket to list objects.
resp, err := c.executeMethod(context.Background(), "GET", requestMetadata{
bucketName: bucketName,
queryValues: urlValues,
contentSHA256Hex: emptySHA256Hex,
})
defer closeResponse(resp)
if err != nil {
return emptyBucketAccessPolicy, err
}
if resp != nil {
if resp.StatusCode != http.StatusOK {
return emptyBucketAccessPolicy, httpRespToErrorResponse(resp, bucketName, "")
}
}
bucketPolicyBuf, err := ioutil.ReadAll(resp.Body)
if err != nil {
return emptyBucketAccessPolicy, err
}
policy := policy.BucketAccessPolicy{}
err = json.Unmarshal(bucketPolicyBuf, &policy)
return policy, err
}
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