(Objective-C) Google Cloud Storage List Bucket Objects

See more Google Cloud Storage Examples

List the objects in a Google Cloud Storage bucket.

For more information, see https://cloud.google.com/storage/docs/json_api/v1/objects/list

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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 - Objects: list 
// 
BOOL success = [http SetUrlVar: @"bucket" value: @"chilkat-ocean"];
success = [http SetUrlVar: @"PROJECT_NAME" value: @"ChilkatCloud"];

CkoHttpResponse *resp = [http QuickGetObj: @"https://www.googleapis.com/storage/v1/b/{$bucket}/o?project={$ChilkatCloud}"];
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#objects",
//   "items": [
//     {
//       "kind": "storage#object",
//       "id": "chilkat-ocean/file with space char.jpg/1555776690752366",
//       "selfLink": "https://www.googleapis.com/storage/v1/b/chilkat-ocean/o/file%20with%20space%20char.jpg",
//       "mediaLink": "https://www.googleapis.com/download/storage/v1/b/chilkat-ocean/o/file%20with%20space%20char.jpg?generation=1555776690752366&alt=media",
//       "name": "file with space char.jpg",
//       "bucket": "chilkat-ocean",
//       "generation": "1555776690752366",
//       "metageneration": "1",
//       "contentType": "image/jpeg",
//       "storageClass": "MULTI_REGIONAL",
//       "size": "6229",
//       "md5Hash": "LpxZ2/JmI2fcl9/dqF2gSA==",
//       "crc32c": "9RjgwQ==",
//       "etag": "CO6WguiH3+ECEAE=",
//       "timeCreated": "2019-04-20T16:11:30.752Z",
//       "updated": "2019-04-20T16:11:30.752Z",
//       "timeStorageClassUpdated": "2019-04-20T16:11:30.752Z"
//     },
//     {
//       "kind": "storage#object",
// 
//       "id": "chilkat-ocean/penguins.jpg/1555775749593296",
//       "selfLink": "https://www.googleapis.com/storage/v1/b/chilkat-ocean/o/penguins.jpg",
//       "mediaLink": "https://www.googleapis.com/download/storage/v1/b/chilkat-ocean/o/penguins.jpg?generation=1555775749593296&alt=media",
//       "name": "penguins.jpg",
//       "bucket": "chilkat-ocean",
//       "generation": "1555775749593296",
//       "metageneration": "1",
//       "contentType": "image/jpeg",
//       "storageClass": "MULTI_REGIONAL",
//       "size": "777835",
//       "md5Hash": "nTd7EM53jEk4s8fixjoimg==",
//       "crc32c": "ixxYVw==",
//       "etag": "CNCxnqeE3+ECEAE=",
//       "timeCreated": "2019-04-20T15:55:49.593Z",
//       "updated": "2019-04-20T15:55:49.593Z",
//       "timeStorageClassUpdated": "2019-04-20T15:55:49.593Z"
//     },
//     {
//       "kind": "storage#object",
//       "id": "chilkat-ocean/starfish.jpg/1628958192639968",
//       "selfLink": "https://www.googleapis.com/storage/v1/b/chilkat-ocean/o/starfish.jpg",
//       "mediaLink": "https://www.googleapis.com/download/storage/v1/b/chilkat-ocean/o/starfish.jpg?generation=1628958192639968&alt=media",
//       "name": "starfish.jpg",
//       "bucket": "chilkat-ocean",
//       "generation": "1628958192639968",
//       "metageneration": "1",
//       "contentType": "image/jpeg",
//       "storageClass": "MULTI_REGIONAL",
//       "size": "6229",
//       "md5Hash": "LpxZ2/JmI2fcl9/dqF2gSA==",
//       "crc32c": "9RjgwQ==",
//       "etag": "COC/tJP2sPICEAE=",
//       "timeCreated": "2021-08-14T16:23:12.660Z",
//       "updated": "2021-08-14T16:23:12.660Z",
//       "timeStorageClassUpdated": "2021-08-14T16:23:12.660Z"
//     }
//   ]
// }

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

NSString *id = 0;
NSString *selfLink = 0;
NSString *mediaLink = 0;
NSString *name = 0;
NSString *bucket = 0;
NSString *generation = 0;
NSString *metageneration = 0;
NSString *contentType = 0;
NSString *storageClass = 0;
NSString *size = 0;
NSString *md5Hash = 0;
NSString *crc32c = 0;
NSString *etag = 0;
NSString *timeCreated = 0;
NSString *updated = 0;
NSString *timeStorageClassUpdated = 0;

NSString *kind = [json StringOf: @"kind"];
int i = 0;
int 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"];
    mediaLink = [json StringOf: @"items[i].mediaLink"];
    name = [json StringOf: @"items[i].name"];
    bucket = [json StringOf: @"items[i].bucket"];
    generation = [json StringOf: @"items[i].generation"];
    metageneration = [json StringOf: @"items[i].metageneration"];
    contentType = [json StringOf: @"items[i].contentType"];
    storageClass = [json StringOf: @"items[i].storageClass"];
    size = [json StringOf: @"items[i].size"];
    md5Hash = [json StringOf: @"items[i].md5Hash"];
    crc32c = [json StringOf: @"items[i].crc32c"];
    etag = [json StringOf: @"items[i].etag"];
    timeCreated = [json StringOf: @"items[i].timeCreated"];
    updated = [json StringOf: @"items[i].updated"];
    timeStorageClassUpdated = [json StringOf: @"items[i].timeStorageClassUpdated"];
    i = i + 1;
}