Authorized access

SDK supports the signing of a URL with a validity period or a public resource URL so that the URL can be transferred to a third party for authorized access.

Sign a private resource URL with a validity period

For a bucket or an object not assigned the public-read permission, the following interface can be called to obtain a signed URL to access the bucket or object:

NSString * constrainURL = nil;
// sign constrain url
OSSTask * task = [client presignConstrainURLWithBucketName:@"<bucket name>"
                                             withObjectKey:@"<object key>"
                                    withExpirationInterval: 30 * 60];
if (!task.error) {
    constrainURL = task.result;
} else {
    NSLog(@"error: %@", task.error);
}

Sign a public resource URL

For a bucket or an object with the public-read permission, the following interface can be called to obtain a public URL to access the bucket or object:

NSString * publicURL = nil;
// sign public URL
task = [client presignPublicURLWithBucketName:@"<bucket name>"
                                withObjectKey:@"<object key>"];
if (!task.error) {
    publicURL = task.result;
} else {
    NSLog(@"sign url error: %@", task.error);
}