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/*
* MinIO Go Library for Amazon S3 Compatible Cloud Storage
* Copyright 2020 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"
"io/ioutil"
"net/http"
"net/url"
"strings"
"github.com/minio/minio-go/v7/pkg/s3utils"
)
// SetBucketPolicy sets the access permissions on an existing bucket.
func (c *Client) SetBucketPolicy(ctx context.Context, bucketName, policy string) error {
// Input validation.
if err := s3utils.CheckValidBucketName(bucketName); err != nil {
return err
}
// If policy is empty then delete the bucket policy.
if policy == "" {
return c.removeBucketPolicy(ctx, bucketName)
}
// Save the updated policies.
return c.putBucketPolicy(ctx, bucketName, policy)
}
// Saves a new bucket policy.
func (c *Client) putBucketPolicy(ctx context.Context, bucketName, policy string) error {
// Get resources properly escaped and lined up before
// using them in http request.
urlValues := make(url.Values)
urlValues.Set("policy", "")
reqMetadata := requestMetadata{
bucketName: bucketName,
queryValues: urlValues,
contentBody: strings.NewReader(policy),
contentLength: int64(len(policy)),
}
// Execute PUT to upload a new bucket policy.
resp, err := c.executeMethod(ctx, http.MethodPut, reqMetadata)
defer closeResponse(resp)
if err != nil {
return err
}
if resp != nil {
if resp.StatusCode != http.StatusNoContent && resp.StatusCode != http.StatusOK {
return httpRespToErrorResponse(resp, bucketName, "")
}
}
return nil
}
// Removes all policies on a bucket.
func (c *Client) removeBucketPolicy(ctx context.Context, bucketName string) error {
// Get resources properly escaped and lined up before
// using them in http request.
urlValues := make(url.Values)
urlValues.Set("policy", "")
// Execute DELETE on objectName.
resp, err := c.executeMethod(ctx, http.MethodDelete, requestMetadata{
bucketName: bucketName,
queryValues: urlValues,
contentSHA256Hex: emptySHA256Hex,
})
defer closeResponse(resp)
if err != nil {
return err
}
if resp.StatusCode != http.StatusNoContent {
return httpRespToErrorResponse(resp, bucketName, "")
}
return nil
}
// GetBucketPolicy returns the current policy
func (c *Client) GetBucketPolicy(ctx context.Context, bucketName string) (string, error) {
// Input validation.
if err := s3utils.CheckValidBucketName(bucketName); err != nil {
return "", err
}
bucketPolicy, err := c.getBucketPolicy(ctx, bucketName)
if err != nil {
errResponse := ToErrorResponse(err)
if errResponse.Code == "NoSuchBucketPolicy" {
return "", nil
}
return "", err
}
return bucketPolicy, nil
}
// Request server for current bucket policy.
func (c *Client) getBucketPolicy(ctx context.Context, bucketName string) (string, 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(ctx, http.MethodGet, requestMetadata{
bucketName: bucketName,
queryValues: urlValues,
contentSHA256Hex: emptySHA256Hex,
})
defer closeResponse(resp)
if err != nil {
return "", err
}
if resp != nil {
if resp.StatusCode != http.StatusOK {
return "", httpRespToErrorResponse(resp, bucketName, "")
}
}
bucketPolicyBuf, err := ioutil.ReadAll(resp.Body)
if err != nil {
return "", err
}
policy := string(bucketPolicyBuf)
return policy, err
}
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