Configuring an Object ACL (SDK for Java)
Function
OBS allows the control of access permissions for objects. By default, only object creators have the read and write permissions on the object. You can set other access control policies for objects. For example, if an object is configured with the public access policy, all users are allowed to read the object. If an object is encrypted with SSE-KMS, the ACL configured for it is not in effect in the cross-tenant case.
You can set an ACL when uploading an object or call an ACL API to modify or obtain the ACL of an existing object.
If you have any questions during development, post them on the Issues page of GitHub.
Object ACLs, similar to bucket ACLs, support predefined ACLs and direct configurations.
An object ACL can be configured in any of the following ways:
- Setting a Pre-defined ACL When Uploading the Object
- Calling ObsClient.setObjectAcl to Set a Pre-defined ACL
- Calling ObsClient.setObjectAcl to Set an ACL Directly
Restrictions
- To configure an object ACL, you must be the bucket owner or have the required permission (obs:object:PutObjectAcl in IAM or PutObjectAcl in a bucket policy). For details, see Introduction to OBS Access Control, IAM Custom Policies, and Configuring an Object Policy.
- The mapping between OBS regions and endpoints must comply with what is listed in Regions and Endpoints.
- An object can have a maximum of 100 policies in its ACL.
Method
obsClient.setObjectAcl(SetObjectAclRequest request)
Request Parameters
Parameter |
Type |
Mandatory (Yes/No) |
Description |
---|---|---|---|
request |
Yes |
Explanation: Request parameters for setting an object ACL. For details, see Table 2. |
Parameter |
Type |
Mandatory (Yes/No) |
Description |
---|---|---|---|
bucketName |
String |
Yes |
Explanation: Bucket name. Restrictions:
Default value: None |
objectKey |
String |
Yes |
Explanation: Object name. An object is uniquely identified by an object name in a bucket. An object name is a complete path that does not contain the bucket name. For example, if the address for accessing the object is examplebucket.obs.ap-southeast-1.myhuaweicloud.com/folder/test.txt, the object name is folder/test.txt. Value range: The value must contain 1 to 1,024 characters. Default value: None |
versionId |
String |
No |
Explanation: Object version ID. Value range: The value must contain 32 characters. Default value: None |
acl |
Yes |
Explanation: An ACL specified for the object. You can use either a pre-defined or a user-defined ACL. For more information about ACLs, see ACLs. Value range:
Default value: AccessControlList.REST_CANNED_PRIVATE |
Constant |
Description |
---|---|
AccessControlList.REST_CANNED_PRIVATE |
Private read/write. A bucket or object can only be accessed by its owner. |
AccessControlList.REST_CANNED_PUBLIC_READ |
Public read. If this permission is granted on a bucket, anyone can read the object list, multipart uploads, bucket metadata, and object versions in the bucket. If this permission is granted on an object, anyone can read the content and metadata of the object. |
AccessControlList.REST_CANNED_PUBLIC_READ_WRITE |
Public read/write. If this permission is granted on a bucket, anyone can read the object list, multipart uploads, and bucket metadata, and can upload or delete objects, initiate multipart uploads, upload parts, assemble parts, copy parts, and cancel multipart upload tasks. If this permission is granted on an object, anyone can read the content and metadata of the object. |
AccessControlList.REST_CANNED_PUBLIC_READ_DELIVERED |
Public read on a bucket as well as objects in the bucket. If this permission is granted on a bucket, anyone can read the object list, multipart tasks, and bucket metadata, and can also read the content and metadata of the objects in the bucket. This permission cannot be granted on objects. |
AccessControlList.REST_CANNED_PUBLIC_READ_WRITE_DELIVERED |
Public read/write on a bucket as well as objects in the bucket. If this permission is granted on a bucket, anyone can read the object list, multipart uploads, and bucket metadata, and can upload or delete objects, initiate multipart upload tasks, upload parts, assemble parts, copy parts, and abort multipart uploads. They can also read the content and metadata of the objects in the bucket. This permission cannot be granted on objects. |
Parameter |
Type |
Mandatory (Yes/No) |
Description |
---|---|---|---|
owner |
Yes |
Explanation: Bucket owner information. For details, see Table 5. |
|
delivered |
boolean |
No |
Explanation: Whether the bucket ACL is applied to all objects in the bucket. Value range: true: The bucket ACL is applied to all objects in the bucket. false: The bucket ACL is not applied to any objects in the bucket. Default value: false |
grants |
Set<GrantAndPermission> |
No |
Explanation: Grantee information. For details, see Table 6. |
Parameter |
Type |
Mandatory (Yes/No) |
Description |
---|---|---|---|
id |
String |
Yes |
Explanation: Account (domain) ID of the bucket owner. Value range: To obtain the account ID, see How Do I Get My Account ID and User ID? Default value: None |
displayName |
String |
No |
Explanation: Account name of the owner. Value range: To obtain the account name, see How Do I Get My Account ID and User ID? Default value: None |
Parameter |
Type |
Mandatory (Yes/No) |
Description |
---|---|---|---|
grantee |
Yes |
Explanation: Grantees (users or user groups). For details, see Table 7. |
|
permission |
Yes |
Explanation: Permissions to grant. Value range: See Table 10. Default value: None |
|
delivered |
boolean |
No |
Explanation: Whether the bucket ACL is applied to all objects in the bucket. Value range: true: The bucket ACL is applied to all objects in the bucket. false: The bucket ACL is not applied to any objects in the bucket. Default value: false |
Parameter |
Type |
Mandatory (Yes/No) |
Description |
---|---|---|---|
Yes |
Explanation: Grantee (user) information. For details, see Table 8. |
||
Yes |
Explanation: Grantee (user group) information. Value range: See Table 9. Default value: None |
Parameter |
Type |
Mandatory (Yes/No) |
Description |
---|---|---|---|
grantId |
String |
Yes if Type is set to GranteeUser |
Explanation: Account (domain) ID of the grantee. Value range: To obtain the account ID, see How Do I Get My Account ID and User ID? Default value: None |
displayName |
String |
No |
Parameter description: Account name of the grantee. Value range: To obtain the account name, see How Do I Get My Account ID and User ID? Default value: None |
Constant |
Description |
---|---|
ALL_USERS |
All users. |
AUTHENTICATED_USERS |
Authorized users. This constant is deprecated. |
LOG_DELIVERY |
Log delivery group. This constant is deprecated. |
Constant |
Default Value |
Description |
---|---|---|
PERMISSION_READ |
READ |
Read permission. 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. |
PERMISSION_WRITE |
WRITE |
Write permission. A grantee with this permission for a bucket can upload, overwrite, and delete any object or part in the bucket. This permission is not available for objects. |
PERMISSION_READ_ACP |
READ_ACP |
Permission to read an ACL. 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. |
PERMISSION_WRITE_ACP |
WRITE_ACP |
Permission to modify an ACL. 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. |
PERMISSION_FULL_CONTROL |
FULL_CONTROL |
Full control access, including read and write permissions for a bucket and its ACL, or for an object and its ACL. A grantee with this permission for a bucket has READ, WRITE, READ_ACP, and WRITE_ACP permissions for the bucket. A grantee with this permission for an object has READ, WRITE, READ_ACP, and WRITE_ACP permissions for the object. |
Responses
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 |
responseHeaders |
Map<String, Object> |
Explanation: HTTP response header list, composed of tuples. In a tuple, the String key indicates the name of the header, and the Object value indicates the value of the header. Default value: None |
Code Example: Setting a Pre-defined ACL When Uploading the Object
This example uploads localfile to bucket examplebucket as object objectname, and specifies a pre-defined ACl during the upload.
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import com.obs.services.ObsClient; import com.obs.services.exception.ObsException; import com.obs.services.model.AccessControlList; import com.obs.services.model.PutObjectRequest; import java.io.File; public class PutObject012 { public static void main(String[] args) { // Obtain an AK/SK pair using environment variables or import the AK/SK pair in other ways. Using hard coding may result in leakage. // Obtain an AK/SK pair on the management console. String ak = System.getenv("ACCESS_KEY_ID"); String sk = System.getenv("SECRET_ACCESS_KEY_ID"); // (Optional) If you are using 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. // Obtain an AK/SK pair and a security token using environment variables or import them in other ways. // String securityToken = System.getenv("SECURITY_TOKEN"); // Enter the endpoint corresponding to the bucket. CN-Hong Kong is used here as an example. Replace it with the one in your actual situation. String endPoint = "https://obs.ap-southeast-1.myhuaweicloud.com"; // Obtain an endpoint using environment variables or import it in other ways. //String endPoint = System.getenv("ENDPOINT"); // Create an ObsClient instance. // Use the permanent AK/SK pair to initialize the client. ObsClient obsClient = new ObsClient(ak, sk,endPoint); // Use the temporary AK/SK pair and security token to initialize the client. // ObsClient obsClient = new ObsClient(ak, sk, securityToken, endPoint); try { // Specify a pre-defined ACL during object upload. PutObjectRequest request = new PutObjectRequest(); request.setBucketName("examplebucket"); request.setObjectKey("objectname"); request.setFile(new File("localfile")); // Set the object ACL to private. request.setAcl(AccessControlList.REST_CANNED_PRIVATE); obsClient.putObject(request); System.out.println("putObject successfully"); } catch (ObsException e) { System.out.println("putObject failed"); // Request failed. Print the HTTP status code. System.out.println("HTTP Code:" + e.getResponseCode()); // Request failed. Print the server-side error code. System.out.println("Error Code:" + e.getErrorCode()); // Request failed. Print the error details. System.out.println("Error Message:" + e.getErrorMessage()); // Request failed. Print the request ID. System.out.println("Request ID:" + e.getErrorRequestId()); System.out.println("Host ID:" + e.getErrorHostId()); e.printStackTrace(); } catch (Exception e) { System.out.println("putObject failed"); // Print other error information. e.printStackTrace(); } } } |
Code Example: Setting a Pre-defined ACL for the Object
This example sets private access to object objectname by specifying a pre-defined ACL.
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import com.obs.services.ObsClient; import com.obs.services.exception.ObsException; import com.obs.services.model.AccessControlList; public class SetObjectAcl001 { public static void main(String[] args) { // Obtain an AK/SK pair using environment variables or import the AK/SK pair in other ways. Using hard coding may result in leakage. // Obtain an AK/SK pair on the management console. String ak = System.getenv("ACCESS_KEY_ID"); String sk = System.getenv("SECRET_ACCESS_KEY_ID"); // (Optional) If you are using 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. // Obtain an AK/SK pair and a security token using environment variables or import them in other ways. // String securityToken = System.getenv("SECURITY_TOKEN"); // Enter the endpoint corresponding to the bucket. CN-Hong Kong is used here as an example. Replace it with the one in your actual situation. String endPoint = "https://obs.ap-southeast-1.myhuaweicloud.com"; // Obtain an endpoint using environment variables or import it in other ways. //String endPoint = System.getenv("ENDPOINT"); // Create an ObsClient instance. // Use the permanent AK/SK pair to initialize the client. ObsClient obsClient = new ObsClient(ak, sk,endPoint); // Use the temporary AK/SK pair and security token to initialize the client. // ObsClient obsClient = new ObsClient(ak, sk, securityToken, endPoint); try { // Set a pre-defined ACL for the object. // Set the object ACL to private. obsClient.setObjectAcl("examplebucket", "objectname", AccessControlList.REST_CANNED_PRIVATE); System.out.println("setObjectAcl successfully"); } catch (ObsException e) { System.out.println("setObjectAcl failed"); // Request failed. Print the HTTP status code. System.out.println("HTTP Code:" + e.getResponseCode()); // Request failed. Print the server-side error code. System.out.println("Error Code:" + e.getErrorCode()); // Request failed. Print the error details. System.out.println("Error Message:" + e.getErrorMessage()); // Request failed. Print the request ID. System.out.println("Request ID:" + e.getErrorRequestId()); System.out.println("Host ID:" + e.getErrorHostId()); e.printStackTrace(); } catch (Exception e) { System.out.println("setObjectAcl failed"); // Print other error information. e.printStackTrace(); } } } |
Code Example: Setting an ACL for the Object Directly
This example configures an ACL for object objectname in bucket examplebucket.
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import com.obs.services.ObsClient; import com.obs.services.exception.ObsException; import com.obs.services.model.AccessControlList; import com.obs.services.model.CanonicalGrantee; import com.obs.services.model.GroupGrantee; import com.obs.services.model.Owner; import com.obs.services.model.Permission; public class SetObjectAcl002 { public static void main(String[] args) { // Obtain an AK/SK pair using environment variables or import the AK/SK pair in other ways. Using hard coding may result in leakage. // Obtain an AK/SK pair on the management console. String ak = System.getenv("ACCESS_KEY_ID"); String sk = System.getenv("SECRET_ACCESS_KEY_ID"); // (Optional) If you are using 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. // Obtain an AK/SK pair and a security token using environment variables or import them in other ways. // String securityToken = System.getenv("SECURITY_TOKEN"); // Enter the endpoint corresponding to the bucket. CN-Hong Kong is used here as an example. Replace it with the one in your actual situation. String endPoint = "https://obs.ap-southeast-1.myhuaweicloud.com"; // Obtain an endpoint using environment variables or import it in other ways. //String endPoint = System.getenv("ENDPOINT"); // Create an ObsClient instance. // Use the permanent AK/SK pair to initialize the client. ObsClient obsClient = new ObsClient(ak, sk,endPoint); // Use the temporary AK/SK pair and security token to initialize the client. // ObsClient obsClient = new ObsClient(ak, sk, securityToken, endPoint); try { AccessControlList acl = new AccessControlList(); Owner owner = new Owner(); owner.setId("ownerid"); // (Mandatory) Owner ID acl.setOwner(owner); //Retain the owner's full control permissions. (Note that if this permission is not set, the owner does not have the access permission.) acl.grantPermission(new CanonicalGrantee("ownerid"), Permission.PERMISSION_FULL_CONTROL); // Grant the full control permission to a specified user. acl.grantPermission(new CanonicalGrantee("userid"), Permission.PERMISSION_FULL_CONTROL); // Grant the read permission to all users. acl.grantPermission(GroupGrantee.ALL_USERS, Permission.PERMISSION_READ); obsClient.setObjectAcl("examplebucket", "objectname", acl); System.out.println("setObjectAcl successfully"); System.out.println(acl); } catch (ObsException e) { System.out.println("setObjectAcl failed"); // Request failed. Print the HTTP status code. System.out.println("HTTP Code:" + e.getResponseCode()); // Request failed. Print the server-side error code. System.out.println("Error Code:" + e.getErrorCode()); // Request failed. Print the error details. System.out.println("Error Message:" + e.getErrorMessage()); // Request failed. Print the request ID. System.out.println("Request ID:" + e.getErrorRequestId()); System.out.println("Host ID:" + e.getErrorHostId()); e.printStackTrace(); } catch (Exception e) { System.out.println("setObjectAcl failed"); // Print other error information. e.printStackTrace(); } } } |
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