Setting CORS Rules

You can call setBucketCORS to set CORS rules for a bucket. If the bucket is configured with CORS rules, the newly set ones will overwrite the existing ones. 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/intl/en-us/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 CORS rules for a bucket.
    
OBSSetBucketCORSRequest *request = [[OBSSetBucketCORSRequest alloc] initWithBucketName:@"bucketname"];
OBSCORSRule* rule = [OBSCORSRule new];
// Specify the request method, which can be GET, PUT, DELETE, POST, or HEAD.
rule.allowedMethodList = @[OBSCORSHTTPGET,OBSCORSHTTPPUT,OBSCORSHTTPPOST,OBSCORSHTTPHEAD];
// Specify the origin of the cross-origin request.
rule.allowedOriginList = @[@"www.example1.com",@"www.example2.com"];
// Set the allowed headers.
rule.allowedHeaderList = @[@"allowedheader1",@"allowedheader2"];
// Specify response headers that users can access using application programs.
rule.exposeHeaderList = @[@"exposeheader_1",@"exposeheader_2"];
// Specify the browser's cache time of the returned results of OPTIONS requests for specific resources, in seconds.
rule.maxAgeSeconds = [NSNumber numberWithInt:100];
[request.bucketCORSRuleList addObject:rule];
[client setBucketCORS:request completionHandler:^(OBSSetBucketCORSResponse *response, NSError *error) {
    NSLog(@"%@",response);
 }];