(Objective-C) Initiate Resumable Upload Session

See more Google Cloud Storage Examples

For more information, see https://cloud.google.com/storage/docs/performing-resumable-uploads

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

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

CkoHttp *http = [[CkoHttp alloc] init];

CkoJsonObject *jsonToken = [[CkoJsonObject alloc] init];
BOOL success = [jsonToken LoadFile: @"qa_data/tokens/googleCloudStorage.json"];
if (success == NO) {
    NSLog(@"%@",jsonToken.LastErrorText);
    return;
}

CkoJsonObject *jsonMetaData = [[CkoJsonObject alloc] init];
[jsonMetaData UpdateString: @"contentType" value: @"image/jpeg"];

// Adds the "Authorization: Bearer <access_token>" header..
http.AuthToken = [jsonToken StringOf: @"access_token"];

[http SetUrlVar: @"bucket_name" value: @"chilkat-bucket-b"];
[http SetUrlVar: @"object_name" value: @"penguins2.jpg"];
NSString *url = @"https://storage.googleapis.com/upload/storage/v1/b/{$bucket_name}/o?uploadType=resumable&name={$object_name}";
CkoHttpResponse *resp = [http PText: @"POST" url: url textData: [jsonMetaData Emit] charset: @"utf-8" contentType: @"application/json" md5: NO gzip: NO];
if (http.LastMethodSuccess == NO) {
    NSLog(@"%@",http.LastErrorText);
    return;
}

int statusCode = [resp.StatusCode intValue];
NSLog(@"%@%d",@"response status code = ",statusCode);

NSString *sessionUrl = @"";

if (statusCode != 200) {
    NSLog(@"%@",resp.BodyStr);
}
else {
    // The session URL will be used to upload the file in chunks, in subsequent HTTP POSTs...
    sessionUrl = [resp GetHeaderField: @"Location"];
    NSLog(@"%@%@",@"Session URL = ",sessionUrl);
}