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/*
* 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)
}
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