Using a Temporary URL for Authorized Access

A temporarily authorized request is a URL temporarily authorized by specifying the AK and SK, request method, and related parameters. This URL contains authentication information and therefore you can use this URL to perform the specific operation in OBS. When the URL is being generated, you need to specify the validity period for it. All sub-classes inherited from OBSBaseRequest support temporary authentication.

The following table describes operations allowed for temporarily authorized requests.

Operation	Class in OBS iOS SDK
PUT Bucket	OBSCreateBucketRequest
GET Buckets	OBSListBucketsRequest
DELETE Bucket	OBSDeleteBucketRequest
GET Objects	OBSListObjectsRequest
GET Object versions	OBSListObjectsVersionsRequest
List Multipart Uploads	OBSListMultipartUploadsRequest
Obtain Bucket Metadata	OBSGetBucketMetaDataRequest
GET Bucket location	OBSGetBucketMetaDataRequest
GET Bucket storageinfo	OBSGetBucketStorageInfoRequest
PUT Bucket quota	OBSSetBucketQuotaRequest
GET Bucket quota	OBSGetBucketQuotaRequest
PUT Bucket acl	OBSSetBucketACLWithCannedACLRequest, OBSSetBucketACLWithPolicyRequest
GET Bucket acl	OBSGetBucketACLRequest
PUT Bucket logging	OBSSetBucketLoggingRequest
GET Bucket logging	OBSGetBucketLoggingRequest
PUT Bucket policy	OBSSetBucketPolicyRequest, OBSSetBucketPolicyWithStringRequest
GET Bucket policy	OBSGetBucketPolicyRequest
DELETE Bucket policy	OBSDeleteBucketPolicyRequest
PUT Bucket lifecycle	OBSSetBucketLifecycleRequest
GET Bucket lifecycle	OBSGetBucketLifecycleRequest
DELETE Bucket lifecycle	OBSDeleteBucketLifecycleRequest
PUT Bucket website	OBSSetBucketWebsiteRequest
GET Bucket website	OBSGetBucketWebsiteRequest
DELETE Bucket website	OBSDeleteBucketWebsiteRequest
PUT Bucket versioning	OBSSetBucketVersioningRequest
GET Bucket versioning	OBSGetBucketVersioningRequest
PUT Bucket cors	OBSSetBucketCORSRequest
GET Bucket cors	OBSGetBucketCORSRequest
DELETE Bucket cors	OBSDeleteBucketCORSRequest
OPTIONS Bucket	OBSOptionsBucketRequest
PUT Bucket tagging	OBSSetBucketTaggingRequest
GET Bucket tagging	OBSGetBucketTaggingRequest
DELETE Bucket tagging	OBSDeleteBucketTaggingRequest
PUT Object	OBSPutObjectWithDataRequest, OBSPutObjectWithFileRequest
Append Object	OBSAppendObjectWithFileRequest
GET Object	OBSGetObjectToDataRequest
PUT Object - Copy	OBSCopyObjectRequest
DELETE Object	OBSDeleteObjectRequest
DELETE Objects	OBSDeleteObjectsRequest
Obtain Object Metadata	OBSGetObjectMetaDataRequest
PUT Object acl	OBSSetObjectACLRequest
GET Object acl	OBSGetObjectACLRequest
Initiate Multipart Upload	OBSInitiateMultipartUploadRequest
PUT Part	OBSUploadPartWithDataRequest
PUT Part - Copy	OBSCopyPartRequest
Listing Uploaded Parts	OBSListPartsRequest
Complete Multipart Upload	OBSCompleteMultipartUploadRequest
Abort Multipart Upload	OBSAbortMultipartUploadRequest
OPTIONS Object	OBSOptionsObjectRequest
POST Object restore	OBSRestoreObjectRequest

If a CORS or signature mismatch error occurs, refer to the following steps to troubleshoot the issue:

If CORS is not configured, you need to configure CORS rules on OBS Console. For details, see .
If the signatures do not match, check whether signature parameters are correct by referring to . For example, during an object upload, the backend uses Content-Type to calculate the signature and generate an authorized URL, but if Content-Type is not set or is set to an incorrect value when the frontend uses the authorized URL, a CORS error occurs. To avoid this issue, ensure that Content-Type fields at both the frontend and backend are kept consistent.

You can call createV2PreSignedURL to create a temporary signed URL for an authorized request. Sample code is as follows:

Listing Objects

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];
OBSListObjectsRequest *request = [[OBSListObjectsRequest alloc] initWithBucketName:@"bucketname"];
    
// Create a V2 authorized access URL.
[client createV2PreSignedURL:request expireAfter:3600 completionHandler:^(NSString *urlString, NSString *httpVerb, NSDictionary *signedHeaders) {
    NSLog(@"%@",urlString);
}]

Obtaining an Object

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];
OBSGetObjectToDataRequest *request = [[OBSGetObjectToDataRequest alloc] initWithBucketName:@"bucketname" objectKey:@"objectkey"];
    
    // Create a V2 authorized access URL.
[client createV2PreSignedURL:request expireAfter:3600 completionHandler:^(NSString *urlString, NSString *httpVerb, NSDictionary *signedHeaders) {
    NSLog(@"%@",urlString);
}]