128 lines
3.9 KiB
Go
128 lines
3.9 KiB
Go
/*
|
|
* MinIO Go Library for Amazon S3 Compatible Cloud Storage
|
|
* Copyright 2015-2020 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"
|
|
"net/http"
|
|
"net/url"
|
|
|
|
"github.com/minio/minio-go/v7/pkg/s3utils"
|
|
)
|
|
|
|
// BucketExists verifies if bucket exists and you have permission to access it. Allows for a Context to
|
|
// control cancellations and timeouts.
|
|
func (c Client) BucketExists(ctx context.Context, bucketName string) (bool, error) {
|
|
// Input validation.
|
|
if err := s3utils.CheckValidBucketName(bucketName); err != nil {
|
|
return false, err
|
|
}
|
|
|
|
// Execute HEAD on bucketName.
|
|
resp, err := c.executeMethod(ctx, http.MethodHead, requestMetadata{
|
|
bucketName: bucketName,
|
|
contentSHA256Hex: emptySHA256Hex,
|
|
})
|
|
defer closeResponse(resp)
|
|
if err != nil {
|
|
if ToErrorResponse(err).Code == "NoSuchBucket" {
|
|
return false, nil
|
|
}
|
|
return false, err
|
|
}
|
|
if resp != nil {
|
|
resperr := httpRespToErrorResponse(resp, bucketName, "")
|
|
if ToErrorResponse(resperr).Code == "NoSuchBucket" {
|
|
return false, nil
|
|
}
|
|
if resp.StatusCode != http.StatusOK {
|
|
return false, httpRespToErrorResponse(resp, bucketName, "")
|
|
}
|
|
}
|
|
return true, nil
|
|
}
|
|
|
|
// StatObject verifies if object exists and you have permission to access.
|
|
func (c Client) StatObject(ctx context.Context, bucketName, objectName string, opts StatObjectOptions) (ObjectInfo, error) {
|
|
// Input validation.
|
|
if err := s3utils.CheckValidBucketName(bucketName); err != nil {
|
|
return ObjectInfo{}, err
|
|
}
|
|
if err := s3utils.CheckValidObjectName(objectName); err != nil {
|
|
return ObjectInfo{}, err
|
|
}
|
|
return c.statObject(ctx, bucketName, objectName, opts)
|
|
}
|
|
|
|
// Lower level API for statObject supporting pre-conditions and range headers.
|
|
func (c Client) statObject(ctx context.Context, bucketName, objectName string, opts StatObjectOptions) (ObjectInfo, error) {
|
|
// Input validation.
|
|
if err := s3utils.CheckValidBucketName(bucketName); err != nil {
|
|
return ObjectInfo{}, err
|
|
}
|
|
if err := s3utils.CheckValidObjectName(objectName); err != nil {
|
|
return ObjectInfo{}, err
|
|
}
|
|
headers := opts.Header()
|
|
if opts.Internal.ReplicationDeleteMarker {
|
|
headers.Set(minIOBucketReplicationDeleteMarker, "true")
|
|
}
|
|
|
|
urlValues := make(url.Values)
|
|
if opts.VersionID != "" {
|
|
urlValues.Set("versionId", opts.VersionID)
|
|
}
|
|
// Execute HEAD on objectName.
|
|
resp, err := c.executeMethod(ctx, http.MethodHead, requestMetadata{
|
|
bucketName: bucketName,
|
|
objectName: objectName,
|
|
queryValues: urlValues,
|
|
contentSHA256Hex: emptySHA256Hex,
|
|
customHeader: headers,
|
|
})
|
|
defer closeResponse(resp)
|
|
if err != nil {
|
|
return ObjectInfo{}, err
|
|
}
|
|
deleteMarker := resp.Header.Get(amzDeleteMarker) == "true"
|
|
|
|
if resp != nil {
|
|
if resp.StatusCode != http.StatusOK && resp.StatusCode != http.StatusPartialContent {
|
|
if resp.StatusCode == http.StatusBadRequest && opts.VersionID != "" && deleteMarker {
|
|
errResp := ErrorResponse{
|
|
StatusCode: resp.StatusCode,
|
|
Code: "MethodNotAllowed",
|
|
Message: "The specified method is not allowed against this resource.",
|
|
BucketName: bucketName,
|
|
Key: objectName,
|
|
}
|
|
return ObjectInfo{
|
|
VersionID: resp.Header.Get(amzVersionID),
|
|
IsDeleteMarker: deleteMarker,
|
|
}, errResp
|
|
}
|
|
return ObjectInfo{
|
|
VersionID: resp.Header.Get(amzVersionID),
|
|
IsDeleteMarker: deleteMarker,
|
|
}, httpRespToErrorResponse(resp, bucketName, objectName)
|
|
}
|
|
}
|
|
|
|
return ToObjectInfo(bucketName, objectName, resp.Header)
|
|
}
|