Objective-C

Manage Bucket Storage Class

See more Google Cloud Storage Examples

Demonstrates how to manage a bucket's default storage class.

See Cloud Storage Classes for information about storage classes.

Objective-C

#import <CkoStringBuilder.h>
#import <CkoJsonObject.h>
#import <CkoHttp.h>
#import <NSString.h>
#import <CkoHttpResponse.h>

BOOL success = NO;

//  This example requires the Chilkat API to have been previously unlocked.
//  See Global Unlock Sample for sample code.

//  This example uses a previously obtained access token having permission for the 
//  scope "https://www.googleapis.com/auth/cloud-platform"

//  In this example, Get Google Cloud Storage OAuth2 Access Token, 
//  the service account access token was saved to a text file.  This example fetches the access token from the file..
CkoStringBuilder *sbToken = [[CkoStringBuilder alloc] init];
[sbToken LoadFile: @"qa_data/tokens/googleCloudStorageAccessToken.txt" charset: @"utf-8"];

//  ---- Step 1
//  Create the JSON body of the PUT request that will be sent.

//  {
//    "storageClass": "[STORAGE_CLASS]"
//  }
//  

CkoJsonObject *json = [[CkoJsonObject alloc] init];
//  Be careful if using the "regional" storage class.  See the note below about the 400 error response.
[json UpdateString: @"storageClass" value: @"nearline"];

//  ---- Step 2
//  Send a PUT equivalent to this curl command

//  curl -X PUT --data-binary @[JSON_FILE_NAME].json \
//      -H "Authorization: Bearer [OAUTH2_TOKEN]" \
//      -H "Content-Type: application/json" \
//      "https://www.googleapis.com/storage/v1/b/[BUCKET_NAME]?fields=storageClass"

CkoHttp *http = [[CkoHttp alloc] init];
http.AuthToken = [sbToken GetAsString];

[http SetUrlVar: @"bucket_name" value: @"chilkat-ocean"];
NSString *url = @"https://www.googleapis.com/storage/v1/b/{$bucket_name}?fields=storageClass";
CkoHttpResponse *resp = [[CkoHttpResponse alloc] init];
success = [http HttpJson: @"PUT" url: url json: json contentType: @"application/json" response: resp];
if (success == NO) {
    NSLog(@"%@",http.LastErrorText);
    return;
}

int responseCode = [resp.StatusCode intValue];
if (responseCode == 401) {
    NSLog(@"%@",resp.BodyStr);
    NSLog(@"%@",@"If invalid credentials, then it is likely the access token expired.");
    NSLog(@"%@",@"Your app should automatically fetch a new access token and re-try.");
    return;
}

//  On my first try at running this code, I received the following error response:
//  Response code: 400
//  Response body
//  {
//   "error": {
//    "errors": [
//     {
//      "domain": "global",
//      "reason": "invalid",
//      "message": "The combination of locationConstraint and storageClass you provided is not supported for your project"
//     }
//    ],
//    "code": 400,
//    "message": "The combination of locationConstraint and storageClass you provided is not supported for your project"
//   }
//  }
//  

//  This was because my storage location was a Multi-regional location, and I tried to assign the "regional" storage class,
//  which is not allowed. 

NSLog(@"%@%d",@"Response code: ",responseCode);
NSLog(@"%@",@"Response body");
NSLog(@"%@",resp.BodyStr);

//  A response code = 200 indicates success, and the response body contains the JSON
//  
//  Response code: 200
//  Response body
//  {
//   "storageClass": "NEARLINE"
//  }
//