/* * Minio Go Library for Amazon S3 Compatible Cloud Storage (C) 2015 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 ( "net/http" "strconv" "strings" "time" ) // BucketExists verify if bucket exists and you have permission to access it. func (c Client) BucketExists(bucketName string) error { // Input validation. if err := isValidBucketName(bucketName); err != nil { return err } // Instantiate a new request. req, err := c.newRequest("HEAD", requestMetadata{ bucketName: bucketName, }) if err != nil { return err } // Initiate the request. resp, err := c.do(req) defer closeResponse(resp) if err != nil { return err } if resp != nil { if resp.StatusCode != http.StatusOK { return HTTPRespToErrorResponse(resp, bucketName, "") } } return nil } // StatObject verifies if object exists and you have permission to access. func (c Client) StatObject(bucketName, objectName string) (ObjectInfo, error) { // Input validation. if err := isValidBucketName(bucketName); err != nil { return ObjectInfo{}, err } if err := isValidObjectName(objectName); err != nil { return ObjectInfo{}, err } // Instantiate a new request. req, err := c.newRequest("HEAD", requestMetadata{ bucketName: bucketName, objectName: objectName, }) if err != nil { return ObjectInfo{}, err } // Initiate the request. resp, err := c.do(req) defer closeResponse(resp) if err != nil { return ObjectInfo{}, err } if resp != nil { if resp.StatusCode != http.StatusOK { return ObjectInfo{}, HTTPRespToErrorResponse(resp, bucketName, objectName) } } // Trim off the odd double quotes from ETag in the beginning and end. md5sum := strings.TrimPrefix(resp.Header.Get("ETag"), "\"") md5sum = strings.TrimSuffix(md5sum, "\"") // Parse content length. size, err := strconv.ParseInt(resp.Header.Get("Content-Length"), 10, 64) if err != nil { return ObjectInfo{}, ErrorResponse{ Code: "InternalError", Message: "Content-Length is invalid. " + reportIssue, BucketName: bucketName, Key: objectName, RequestID: resp.Header.Get("x-amz-request-id"), HostID: resp.Header.Get("x-amz-id-2"), AmzBucketRegion: resp.Header.Get("x-amz-bucket-region"), } } // Parse Last-Modified has http time format. date, err := time.Parse(http.TimeFormat, resp.Header.Get("Last-Modified")) if err != nil { return ObjectInfo{}, ErrorResponse{ Code: "InternalError", Message: "Last-Modified time format is invalid. " + reportIssue, BucketName: bucketName, Key: objectName, RequestID: resp.Header.Get("x-amz-request-id"), HostID: resp.Header.Get("x-amz-id-2"), AmzBucketRegion: resp.Header.Get("x-amz-bucket-region"), } } // Fetch content type if any present. contentType := strings.TrimSpace(resp.Header.Get("Content-Type")) if contentType == "" { contentType = "application/octet-stream" } // Save object metadata info. var objectStat ObjectInfo objectStat.ETag = md5sum objectStat.Key = objectName objectStat.Size = size objectStat.LastModified = date objectStat.ContentType = contentType return objectStat, nil }