(Objective-C) Google Drive Multipart Upload String

Demonstrates a file upload to Google Drive where the contents of the file are contained in a string variable.

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#import <CkoAuthGoogle.h>
#import <CkoRest.h>
#import <CkoJsonObject.h>
#import <NSString.h>

// This example will upload a file to Google Drive.
BOOL success = YES;

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

CkoAuthGoogle *gAuth = [[CkoAuthGoogle alloc] init];
gAuth.Scope = @"https://www.googleapis.com/auth/drive";
gAuth.SubEmailAddress = @"some.user@example.com";
gAuth.ExpireNumSeconds = [NSNumber numberWithInt:3600];

// Obtain an access token as shown in one of the following examples:
// See Get Access Token using a Service Account JSON Key
// See Get Access Token using a P12 File

CkoRest *rest = [[CkoRest alloc] init];

// Connect using TLS.
BOOL bAutoReconnect = YES;
success = [rest Connect: @"www.googleapis.com" port: [NSNumber numberWithInt: 443] tls: YES autoReconnect: bAutoReconnect];

// Provide the authentication credentials (i.e. the access key)
success = [rest SetAuthGoogle: gAuth];

// A multipart upload to Google Drive needs a multipart/related Content-Type
success = [rest AddHeader: @"Content-Type" value: @"multipart/related"];

// Specify each part of the request.

// The 1st part is JSON with information about the file.
rest.PartSelector = @"1";
success = [rest AddHeader: @"Content-Type" value: @"application/json; charset=UTF-8"];

CkoJsonObject *json = [[CkoJsonObject alloc] init];
success = [json AddStringAt: [NSNumber numberWithInt: -1] name: @"title" value: @"helloWorld.txt"];
success = [json AddStringAt: [NSNumber numberWithInt: -1] name: @"description" value: @"A simple text file that says Hello World."];
success = [json AddStringAt: [NSNumber numberWithInt: -1] name: @"mimeType" value: @"text/plain"];
success = [rest SetMultipartBodyString: [json Emit]];

// The 2nd part is the file content.
// In this case, we'll upload a simple text file containing "Hello World!"
rest.PartSelector = @"2";
success = [rest AddHeader: @"Content-Type" value: @"text/plain"];
success = [rest SetMultipartBodyString: @"Hello World!"];

// POST https://www.googleapis.com/upload/drive/v2/files
NSString *jsonResponse = [rest FullRequestMultipart: @"POST" uriPath: @"/upload/drive/v2/files?uploadType=multipart"];
if (rest.LastMethodSuccess != YES) {
    NSLog(@"%@",rest.LastErrorText);
    return;
}

// Show the JSON response.
NSLog(@"%@%d",@"Response Status Code: ",[rest.ResponseStatusCode intValue]);
NSLog(@"%@%@",@"Json Response: ",jsonResponse);