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Checking Whether Buckets Exist

Last updated: 2022-05-26 14:50:34

    Overview

    This document provides sample code for quickly checking whether a bucket exists.

    The sample code actually calls the HEAD Bucket COS API and is a simplified version of the API.

    In addition to checking whether a bucket exists, HEAD Bucket also checks whether you have permission to access the bucket. Possible scenarios are as follows:

    • If the bucket exists and you have permission to read it, HTTP status code 200 will be returned.
    • If you do not have permission to read the bucket, HTTP status code 403 will be returned.
    • If the bucket does not exist, HTTP status code 404 will be returned.

    Checking Whether a Bucket Exists

    Description

    You can check whether a bucket exists by using the shortcut API provided by the SDK.

    Note:

    The COS Go SDK version should not be earlier than v0.7.33.

    Method prototype

    func (s *BucketService) IsExist(ctx context.Context) (isExist bool, err error)
    

    Sample code

    package main
    import (
          "context"
          "fmt"
          "github.com/tencentyun/cos-go-sdk-v5"
          "net/http"
          "net/url"
          "os"
    )
    func main() {
          // Bucket name in the format of BucketName-APPID (APPID is required), which can be viewed in the COS console at https://console.intl.cloud.tencent.com/cos5/bucket
          // Replace it with your region, which can be viewed in the COS console at https://console.intl.cloud.tencent.com/. For more information about regions, see https://intl.cloud.tencent.com/document/product/436/6224.
          u, _ := url.Parse("https://examplebucket-1250000000.cos.ap-guangzhou.myqcloud.com")
          b := &cos.BaseURL{BucketURL: u}
          client := cos.NewClient(b, &http.Client{
                  Transport: &cos.AuthorizationTransport{
                          // Get the key from environment variables
                          // Environment variable `SECRETID` refers to the user's SecretId, which can be viewed at https://console.intl.cloud.tencent.com/cam/capi
                          SecretID: os.Getenv("SECRETID"),
                          // Environment variable `SECRETKEY` refers to the user's SecretKey, which can be viewed at https://console.intl.cloud.tencent.com/cam/capi
                          SecretKey: os.Getenv("SECRETKEY"),
                  },
          })
           ok, err := client.Bucket.IsExist(context.Background())
          if err == nil && ok {
                  fmt.Printf("bucket exists\n")
          } else if err != nil {
                  fmt.Printf("head bucket failed: %v\n", err)
          } else {
                  fmt.Printf("bucket does not exist\n")
          }
    }
    

    Response description

    Parameter Description Type
    isExist Whether the bucket exists bool
    err Whether the request is successful struct
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