Managing Bucket Policies

Besides bucket ACLs, bucket owners can use bucket policies to centrally control access to buckets and objects in buckets.

Setting a Bucket Policy

You can call setBucketPolicy to set a bucket policy. Sample code is as follows:

static OBSClient *client;
NSString *endPoint = @"your-endpoint";

// Hard-coded or plaintext AK/SK are risky. For security purposes, encrypt your AK/SK and store them in the configuration file or environment variables. In this example, the AK/SK are stored in environment variables for identity authentication. Before running this example, configure environment variables AccessKeyID and SecretAccessKey.
// Obtain an AK/SK pair on the management console. For details, see https://support.huaweicloud.com/eu/usermanual-ca/ca_01_0003.html.
char* ak_env = getenv("AccessKeyID");
char* sk_env = getenv("SecretAccessKey");
NSString *AK = [NSString stringWithUTF8String:ak_env];
NSString *SK = [NSString stringWithUTF8String:sk_env];

// Initialize identity authentication.
OBSStaticCredentialProvider *credentialProvider = [[OBSStaticCredentialProvider alloc] initWithAccessKey:AK secretKey:SK];
    
//Initialize service configuration.
OBSServiceConfiguration *conf = [[OBSServiceConfiguration alloc] initWithURLString:endPoint credentialProvider:credentialProvider];
    
// Initialize an instance of OBSClient.
client = [[OBSClient alloc] initWithConfiguration:conf];
    
// Set a bucket policy.
OBSSetBucketPolicyWithStringRequest *request = [[OBSSetBucketPolicyWithStringRequest alloc] initWithBucketName:@"bucketname" policyString:@"policystring"];
[client setBucketPolicy:request completionHandler:^(OBSSetBucketPolicyResponse *response, NSError *error){
    NSLog(@"%@",response);  
 }];

For details about the format (JSON character string) of bucket policies, see the Object Storage Service API Reference.

Obtaining a Bucket Policy

You can call getBucketPolicy to obtain a bucket policy. Sample code is as follows:

static OBSClient *client;
NSString *endPoint = @"your-endpoint";
// Hard-coded or plaintext AK/SK are risky. For security purposes, encrypt your AK/SK and store them in the configuration file or environment variables. In this example, the AK/SK are stored in environment variables for identity authentication. Before running this example, configure environment variables AccessKeyID and SecretAccessKey.
// Obtain an AK/SK pair on the management console. For details, see https://support.huaweicloud.com/eu/usermanual-ca/ca_01_0003.html.
char* ak_env = getenv("AccessKeyID");
char* sk_env = getenv("SecretAccessKey");
NSString *AK = [NSString stringWithUTF8String:ak_env];
NSString *SK = [NSString stringWithUTF8String:sk_env];

// Initialize identity authentication.
OBSStaticCredentialProvider *credentialProvider = [[OBSStaticCredentialProvider alloc] initWithAccessKey:AK secretKey:SK];
    
//Initialize service configuration.
OBSServiceConfiguration *conf = [[OBSServiceConfiguration alloc] initWithURLString:endPoint credentialProvider:credentialProvider];
    
// Initialize an instance of OBSClient.
client = [[OBSClient alloc] initWithConfiguration:conf];
    
// Obtain the bucket ACL.
OBSGetBucketPolicyRequest *request = [[OBSGetBucketPolicyRequest alloc] initWithBucketName:g_bucketName];
[client getBucketPolicy:request completionHandler:^(OBSGetBucketPolicyResponse *response, NSError *error){
    NSLog(@"%@",response);  
 }];

Deleting a Bucket Policy

You can call deleteBucketPolicy to delete a bucket policy. Sample code is as follows:

static OBSClient *client;
NSString *endPoint = @"your-endpoint";

// Hard-coded or plaintext AK/SK are risky. For security purposes, encrypt your AK/SK and store them in the configuration file or environment variables. In this example, the AK/SK are stored in environment variables for identity authentication. Before running this example, configure environment variables AccessKeyID and SecretAccessKey.
// Obtain an AK/SK pair on the management console. For details, see https://support.huaweicloud.com/eu/usermanual-ca/ca_01_0003.html.
char* ak_env = getenv("AccessKeyID");
char* sk_env = getenv("SecretAccessKey");
NSString *AK = [NSString stringWithUTF8String:ak_env];
NSString *SK = [NSString stringWithUTF8String:sk_env];

// Initialize identity authentication.
OBSStaticCredentialProvider *credentialProvider = [[OBSStaticCredentialProvider alloc] initWithAccessKey:AK secretKey:SK];
    
//Initialize service configuration.
OBSServiceConfiguration *conf = [[OBSServiceConfiguration alloc] initWithURLString:endPoint credentialProvider:credentialProvider];
    
// Initialize an instance of OBSClient.
client = [[OBSClient alloc] initWithConfiguration:conf];
    
// Delete a bucket policy.
OBSDeleteBucketPolicyRequest *request = [[OBSDeleteBucketPolicyRequest alloc] initWithBucketName:g_bucketName];
[client deleteBucketPolicy:request completionHandler:^(OBSDeleteBucketPolicyResponse *response, NSError *error) {
     NSLog(@"%@",response);
}];