Obtaining a Bucket ACL (SDK for Node.js)

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 (including bucket and object ACLs). For more information, see Introduction to OBS Access Control.

A bucket ACL applies permissions to another account and its IAM users, rather than the current account and its IAM users. It can grant access to both a bucket (including the objects in it) and the bucket ACL. The granted access includes view and edit permissions. You must specify a bucket name when configuring a bucket ACL. For more information, see ACLs.

This API returns the ACL of a bucket.

Restrictions

To obtain the ACL of a bucket, you must be the bucket owner or have the required permission (obs:bucket:GetBucketAcl in IAM or GetBucketAcl in a bucket policy). For details, see Introduction to OBS Access Control, IAM Custom Policies, and Creating a Custom Bucket Policy.
To learn about the mappings between OBS regions and endpoints, see Regions and Endpoints.

Method

ObsClient.getBucketAcl(params)

Request Parameters

**Table 1** BucketRequestInput
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 with 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. Value range: The value can contain 3 to 63 characters. Default value: None

Responses

**Table 2** Responses
Type	Description
Table 3 NOTE: This API returns a Promise response, which requires the Promise or async/await syntax.	Explanation: Returned results. For details, see Table 3.

**Table 3** Response
Parameter	Type	Description
CommonMsg	ICommonMsg	Explanation: Common information generated after an API call is complete, including the HTTP status code and error code. For details, see Table 4.
InterfaceResult	Table 5	Explanation: Results outputted for a successful call. For details, see Table 5. Restrictions: This parameter is not included if the value of Status is greater than 300.

**Table 4** ICommonMsg
Parameter	Type	Description
Status	number	Explanation: HTTP status code returned by the OBS server. Value range: A status code is a group of digits indicating the status of a response. It ranges from 2xx (indicating successes) to 4xx or 5xx (indicating errors). For details, see Status Codes.
Code	string	Explanation: Error code returned by the OBS server.
Message	string	Explanation: Error description returned by the OBS server.
HostId	string	Explanation: Request server ID returned by the OBS server.
RequestId	string	Explanation: Request ID returned by the OBS server.
Id2	string	Explanation: Request ID2 returned by the OBS server.
Indicator	string	Explanation: Error code details returned by the OBS server.

**Table 5** GetBucketAclOutput
Parameter	Type	Description
RequestId	string	Explanation: Request ID returned by the OBS server
Owner	Owner	Explanation: Account ID of the bucket owner. For details, see Table 6.
Grants	Grant[]	Explanation: Grantees' permission information. For details, see Table 7.

**Table 6** Owner
Parameter	Type	Mandatory (Yes/No)	Description
ID	string	Yes if used as a request parameter	Explanation: Account (domain) ID of the owner Value range: To obtain the account ID, see How Do I Get My Account ID and User ID? (SDK for Node.js) Default value: None
DisplayName	string	No	Explanation: Account name of the owner Default value: None

**Table 7** Grant
Parameter	Type	Description
Grantee	Grantee	Explanation: Grantee information. For details, see Table 8.
Permission	string	Explanation: Granted permissions. For details, see Table 11.

**Table 8** Grantee
Parameter	Type	Description
Type	string	Explanation: Grantee type. For details, see Table 9.
ID	string	Explanation: Account (domain) ID of the grantee.
Name	string	Explanation: Account name of the grantee
URI	string	Explanation: Authorized user group. For details, see Table 10.

**Table 9** GranteeType
Constant	Description
Group	Grants permissions to user groups.
CanonicalUser	Grants permissions to individual users.

**Table 10** GroupUriType
Constant	Default Value	Description
ObsClient.enums.GroupAllUsers	AllUsers	All users.
ObsClient.enums.GroupAuthenticatedUsers	AuthenticatedUsers	Authorized users. This constant is deprecated.
ObsClient.enums.GroupLogDelivery	LogDelivery	Log delivery group. This constant is deprecated.

**Table 11** PermissionType
Constant	Default Value	Description
ObsClient.enums.PermissionRead	READ	A grantee with this permission for a bucket can obtain the list of objects, multipart uploads, bucket metadata, and object versions in the bucket. A grantee with this permission for an object can obtain the object content and metadata.
ObsClient.enums.PermissionWrite	WRITE	A grantee with this permission for a bucket can upload, overwrite, and delete any object or part in the bucket. This permission is not applicable to objects.
ObsClient.enums.PermissionReadAcp	READ_ACP	A grantee with this permission can obtain the ACL of a bucket or object. A bucket or object owner has this permission for their bucket or object by default.
ObsClient.enums.PermissionWriteAcp	WRITE_ACP	A grantee with this permission can update the ACL of a bucket or object. A bucket or object owner has this permission for their bucket or object by default. This permission allows the grantee to change the access control policies, meaning the grantee has full control over a bucket or object.
ObsClient.enums.PermissionFullControl	FULL_CONTROL	A grantee with this permission for a bucket has PermissionRead, PermissionWrite, PermissionReadAcp, and PermissionWriteAcp permissions for the bucket. A grantee with this permission for an object has PermissionRead, PermissionReadAcp, and PermissionWriteAcp permissions for the object.

Code Examples

This example returns the ACL of bucket examplebucket.

    
     
       
       
         // Import the OBS library.
// Use npm to install the client.
const ObsClient = require("esdk-obs-nodejs");
// Use the source code to install the client.
// var ObsClient = require('./lib/obs');

// Create an instance of ObsClient.
const obsClient = new ObsClient({
  //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.
  access_key_id: process.env.ACCESS_KEY_ID,
  secret_access_key: process.env.SECRET_ACCESS_KEY,
  // (Optional) If you use a temporary AK/SK pair and a security token to access OBS, you are advised not to use hard coding, which may result in information leakage. You can obtain an AK/SK pair using environment variables or import an AK/SK pair in other ways.
  // security_token: process.env.SECURITY_TOKEN,
  // Enter the endpoint corresponding to the region where the bucket is located. CN-Hong Kong is used here in this example. Replace it with the one currently in use.
  server: "https://obs.ap-southeast-1.myhuaweicloud.com"
});

async function getBucketAcl() {
  try {
    const params = {
      // Specify the bucket name.
      Bucket: "examplebucket"
    };
    // Obtain the bucket ACL.
    const result = await obsClient.getBucketAcl(params);
    if (result.CommonMsg.Status <= 300) {
      console.log("Get bucket(%s)'s acl rules successful!", params.Bucket);
      console.log('RequestId: %s', result.InterfaceResult.RequestId);
      console.log('Owner[ID]: %s', result.InterfaceResult.Owner.ID);
      console.log('Grants:');
      for (let i = 0; i < result.InterfaceResult.Grants.length; i++) {
        const grant = result.InterfaceResult.Grants[i];
        console.log("Grant[%d]-Type:%s, ID:%s, URI:%s, Permission:%s",
          i, grant.Grantee.Type, grant.Grantee.ID, grant.Grantee.URI, grant.Permission
        );
      };
      return;
    };
    console.log("An ObsError was found, which means your request sent to OBS was rejected with an error response.");
    console.log("Status: %d", result.CommonMsg.Status);
    console.log("Code: %s", result.CommonMsg.Code);
    console.log("Message: %s", result.CommonMsg.Message);
    console.log("RequestId: %s", result.CommonMsg.RequestId);
  } catch (error) {
    console.log("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.");
    console.log(error);
  };
};

getBucketAcl();

        

      

    
   