mirror of
https://github.com/octoleo/restic.git
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93 lines
2.9 KiB
Go
93 lines
2.9 KiB
Go
/*
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* Minio Go Library for Amazon S3 Compatible Cloud Storage (C) 2015, 2016 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package minio
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import (
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"io"
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"io/ioutil"
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"net/http"
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"net/url"
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"sort"
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)
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// GetBucketPolicy - get bucket policy at a given path.
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func (c Client) GetBucketPolicy(bucketName, objectPrefix string) (bucketPolicy BucketPolicy, err error) {
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// Input validation.
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if err := isValidBucketName(bucketName); err != nil {
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return BucketPolicyNone, err
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}
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if err := isValidObjectPrefix(objectPrefix); err != nil {
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return BucketPolicyNone, err
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}
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policy, err := c.getBucketPolicy(bucketName, objectPrefix)
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if err != nil {
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return BucketPolicyNone, err
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}
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return identifyPolicyType(policy, bucketName, objectPrefix), nil
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}
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// Request server for policy.
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func (c Client) getBucketPolicy(bucketName string, objectPrefix string) (BucketAccessPolicy, error) {
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// Get resources properly escaped and lined up before
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// using them in http request.
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urlValues := make(url.Values)
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urlValues.Set("policy", "")
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// Execute GET on bucket to list objects.
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resp, err := c.executeMethod("GET", requestMetadata{
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bucketName: bucketName,
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queryValues: urlValues,
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})
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defer closeResponse(resp)
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if err != nil {
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return BucketAccessPolicy{}, err
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}
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return processBucketPolicyResponse(bucketName, resp)
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}
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// processes the GetPolicy http response from the server.
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func processBucketPolicyResponse(bucketName string, resp *http.Response) (BucketAccessPolicy, error) {
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if resp != nil {
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if resp.StatusCode != http.StatusOK {
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errResponse := httpRespToErrorResponse(resp, bucketName, "")
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if ToErrorResponse(errResponse).Code == "NoSuchBucketPolicy" {
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return BucketAccessPolicy{Version: "2012-10-17"}, nil
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}
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return BucketAccessPolicy{}, errResponse
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}
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}
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// Read access policy up to maxAccessPolicySize.
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// http://docs.aws.amazon.com/AmazonS3/latest/dev/access-policy-language-overview.html
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// bucket policies are limited to 20KB in size, using a limit reader.
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bucketPolicyBuf, err := ioutil.ReadAll(io.LimitReader(resp.Body, maxAccessPolicySize))
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if err != nil {
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return BucketAccessPolicy{}, err
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}
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policy, err := unMarshalBucketPolicy(bucketPolicyBuf)
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if err != nil {
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return BucketAccessPolicy{}, err
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}
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// Sort the policy actions and resources for convenience.
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for _, statement := range policy.Statements {
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sort.Strings(statement.Actions)
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sort.Strings(statement.Resources)
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}
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return policy, nil
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}
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