Configuring a Bucket Policy (SDK for Go)

Function

OBS provides access control over buckets. You can use an access policy to define whether a user can perform certain operations on a specific bucket. OBS access control can be implemented using IAM permissions, bucket policies, and ACLs. For more information, see Introduction to OBS Access Control.

A bucket policy is applied to a configured bucket and the objects in it. You can use a bucket policy to grant permissions for the bucket and the objects in it to IAM users or other accounts. If you want IAM users to have different permissions for different buckets, you can configure required bucket policies.

This API configures a policy for a bucket.

Restrictions

Permissions for creating a bucket and obtaining a bucket list are service level and should be granted using IAM Permissions.
Due to data caching, after a bucket policy is configured, it takes 5 minutes at most for the policy to take effect.
To configure a bucket policy, you must be the bucket owner or have the required permission (obs:bucket:PutBucketPolicy in IAM or PutBucketPolicy in a bucket policy). For details, see Introduction to OBS Access Control, IAM Custom Policies, and Creating a Custom Bucket Policy.
The mapping between OBS regions and endpoints must comply with what is listed in Regions and Endpoints.

Method

func (obsClient ObsClient) SetBucketPolicy(input *SetBucketPolicyInput) (output *BaseModel, err error)

Request Parameters

**Table 1** List of request parameters
Parameter	Type	Mandatory (Yes/No)	Description
input	*SetBucketPolicyInput	Yes	Explanation: Input parameters for configuring a bucket policy. For details, see Table 2.

**Table 2** SetBucketPolicyInput
Parameter	Type	Mandatory (Yes/No)	Description
Bucket	string	Yes	Explanation: Bucket name Restrictions: A bucket name must be unique across all accounts and regions. A bucket name: Must be 3 to 63 characters long and start with a digit or letter. Lowercase letters, digits, hyphens (-), and periods (.) are allowed. Cannot be formatted as an IP address. Cannot start or end with a hyphen (-) or period (.). Cannot contain two consecutive periods (..), for example, my..bucket. Cannot contain a period (.) and a hyphen (-) adjacent to each other, for example, my-.bucket or my.-bucket. If you repeatedly create buckets of the same name in the same region, no error will be reported and the bucket attributes comply with those set in the first creation request. Default value: None
Policy	string	Yes	Explanation: Policy information in JSON format Restrictions: The bucket name contained in the Resource parameter of the policy must be the one specified for the current bucket policy. For details about the policy format, see Bucket Policy Parameters. Default value: None

Responses

**Table 3** List of returned results
Parameter	Type	Description
output	*BaseModel	Explanation: Returned results. For details, see Table 4.
err	error	Explanation: Error messages returned by the API

**Table 4** BaseModel
Parameter	Type	Description
StatusCode	int	Explanation: HTTP status code Value range: A status code is a group of digits that can be 2xx (indicating successes) or 4xx or 5xx (indicating errors). It indicates the status of a response. For more information, see Status Code. Default value: None
RequestId	string	Explanation: Request ID returned by the OBS server Default value: None
ResponseHeaders	map[string][]string	Explanation: HTTP response headers Default value: None

Code Examples

This example configures a policy for bucket examplebucket.

    
     
       
       
         package main
import (
    "fmt"
    "os"
    obs "github.com/huaweicloud/huaweicloud-sdk-go-obs/obs"
)
func main() {
    //Obtain an AK/SK pair using environment variables or import an AK/SK pair in other ways. Using hard coding may result in leakage.
    //Obtain an AK/SK pair on the management console. For details, see https://support.huaweicloud.com/intl/en-us/usermanual-ca/ca_01_0003.html.
    ak := os.Getenv("AccessKeyID")
    sk := os.Getenv("SecretAccessKey")
    // (Optional) If you use a temporary AK/SK pair and a security token to access OBS, you are advised not to use hard coding to reduce leakage risks. You can obtain an AK/SK pair using environment variables or import an AK/SK pair in other ways.
    // securityToken := os.Getenv("SecurityToken")
    // Enter the endpoint corresponding to the bucket. CN-Hong Kong is used here as an example. Replace it with the one currently in use.
    endPoint := "https://obs.ap-southeast-1.myhuaweicloud.com"
    // Create an obsClient instance.
    // If you use a temporary AK/SK pair and a security token to access OBS, use the obs.WithSecurityToken method to specify a security token when creating an instance.
    obsClient, err := obs.New(ak, sk, endPoint, obs.WithSignature(obs.SignatureObs)/*, obs.WithSecurityToken(securityToken)*/)
    if err != nil {
        fmt.Printf("Create obsClient error, errMsg: %s", err.Error())
    }
    input := &obs.SetBucketPolicyInput{}
    // Specify a bucket name.
    input.Bucket = "exampleBucket"
    // Create a bucket policy.
    input.Policy = "{\"Statement\":[{\"Sid\":\"Custom policy-2482\",\"Effect\":\"Allow\",\"Principal\":{\"ID\":[\"*\"]},\"Action\":[\"*\",\"ListBucket\"],\"Resource\":[\"" + input.Bucket + "\"]}]}"
    // Configure the bucket policy.
    output, err := obsClient.SetBucketPolicy(input)
    if err == nil {
        fmt.Printf("SetBucketPolicy:%s successful!\n", input.Bucket)
        fmt.Printf("RequestId:%s\n", output.RequestId)
        return
    }
    fmt.Printf("SetBucketPolicy:%s fail!\n", input.Bucket)
    if obsError, ok := err.(obs.ObsError); ok {
        fmt.Println("An ObsError was found, which means your request sent to OBS was rejected with an error response.")
        fmt.Println(obsError.Error())
    } else {
        fmt.Println("An Exception was found, which means the client encountered an internal problem when attempting to communicate with OBS, for example, the client was unable to access the network.")
        fmt.Println(err)
    }
}

        

      

    
   