Help Center> Object Storage Service> iOS> Temporarily Authorized Access> Using a Temporary URL for Authorized Access
Updated on 2023-11-09 GMT+08:00
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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:

  1. If CORS is not configured, you need to configure CORS rules on OBS Console. For details, see Configuring CORS.
  2. If the signatures do not match, check whether signature parameters are correct by referring to Authentication of Signature in a URL. 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/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];
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/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];
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);
}]