(Objective-C) Google Cloud Storage List Buckets

Demonstrates how to retrieve a list of buckets for a given project.

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

// 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"];

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

// For more info see Cloud Storage Documentation - Buckets: list 
// 
BOOL success = [http SetUrlVar: @"PROJECT_NAME" value: @"ChilkatCloud"];
CkoHttpResponse *resp = [http QuickGetObj: @"https://www.googleapis.com/storage/v1/b?project={$PROJECT_NAME}"];
if (http.LastMethodSuccess == 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;
}

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

CkoJsonObject *json = [[CkoJsonObject alloc] init];
success = [json Load: resp.BodyStr];

json.EmitCompact = NO;

NSLog(@"%@",[json Emit]);

// A response code = 200 indicates success, and the response body contains JSON such as this:

// {
//   "kind": "storage#buckets",
//   "items": [
//     {
//       "kind": "storage#bucket",
//       "id": "chilkat-bucket",
//       "selfLink": "https://www.googleapis.com/storage/v1/b/chilkat-bucket",
//       "projectNumber": "5332332985",
//       "name": "chilkat-bucket",
//       "timeCreated": "2018-10-23T00:04:44.507Z",
//       "updated": "2018-10-23T00:04:44.507Z",
//       "metageneration": "1",
//       "iamConfiguration": {
//         "bucketPolicyOnly": {
//           "enabled": false
//         }
//       },
//       "location": "US",
//       "storageClass": "MULTI_REGIONAL",
//       "etag": "CAE="
//     },
//     {
//       "kind": "storage#bucket",
//       "id": "chilkat-images",
//       "selfLink": "https://www.googleapis.com/storage/v1/b/chilkat-images",
//       "projectNumber": "5332332985",
//       "name": "chilkat-images",
//       "timeCreated": "2018-10-23T11:24:43.000Z",
//       "updated": "2018-10-23T11:24:43.000Z",
//       "metageneration": "1",
//       "iamConfiguration": {
//         "bucketPolicyOnly": {
//           "enabled": false
//         }
//       },
//       "location": "US",
//       "storageClass": "MULTI_REGIONAL",
//       "etag": "CAE="
//     }
//   ]
// }

// Use this online tool to generate parsing code from sample JSON: 
// Generate Parsing Code from JSON

NSString *kind = 0;
int i;
int count_i;
NSString *id = 0;
NSString *selfLink = 0;
NSString *projectNumber = 0;
NSString *name = 0;
NSString *timeCreated = 0;
NSString *updated = 0;
NSString *metageneration = 0;
BOOL iamConfigurationBucketPolicyOnlyEnabled;
NSString *location = 0;
NSString *storageClass = 0;
NSString *etag = 0;

kind = [json StringOf: @"kind"];
i = 0;
count_i = [[json SizeOfArray: @"items"] intValue];
while (i < count_i) {
    json.I = [NSNumber numberWithInt: i];
    kind = [json StringOf: @"items[i].kind"];
    id = [json StringOf: @"items[i].id"];
    selfLink = [json StringOf: @"items[i].selfLink"];
    projectNumber = [json StringOf: @"items[i].projectNumber"];
    name = [json StringOf: @"items[i].name"];
    timeCreated = [json StringOf: @"items[i].timeCreated"];
    updated = [json StringOf: @"items[i].updated"];
    metageneration = [json StringOf: @"items[i].metageneration"];
    iamConfigurationBucketPolicyOnlyEnabled = [json BoolOf: @"items[i].iamConfiguration.bucketPolicyOnly.enabled"];
    location = [json StringOf: @"items[i].location"];
    storageClass = [json StringOf: @"items[i].storageClass"];
    etag = [json StringOf: @"items[i].etag"];
    i = i + 1;
}