/* * 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" "net/http" "github.com/minio/minio-go/v6/pkg/s3utils" ) // BucketExists verify if bucket exists and you have permission to access it. func (c Client) BucketExists(bucketName string) (bool, error) { return c.BucketExistsWithContext(context.Background(), bucketName) } // BucketExistsWithContext verify if bucket exists and you have permission to access it. Allows for a Context to // control cancellations and timeouts. func (c Client) BucketExistsWithContext(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, "HEAD", 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(bucketName, objectName string, opts StatObjectOptions) (ObjectInfo, error) { return c.StatObjectWithContext(context.Background(), bucketName, objectName, opts) } // StatObjectWithContext verifies if object exists and you have permission to access with a context to control // cancellations and timeouts. func (c Client) StatObjectWithContext(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 } // Execute HEAD on objectName. resp, err := c.executeMethod(ctx, "HEAD", requestMetadata{ bucketName: bucketName, objectName: objectName, contentSHA256Hex: emptySHA256Hex, customHeader: opts.Header(), }) defer closeResponse(resp) if err != nil { return ObjectInfo{}, err } if resp != nil { if resp.StatusCode != http.StatusOK && resp.StatusCode != http.StatusPartialContent { return ObjectInfo{}, httpRespToErrorResponse(resp, bucketName, objectName) } } return ToObjectInfo(bucketName, objectName, resp.Header) }