(Objective-C) Upload File from String

Uploads a text file where the contents of the file are contained in a string variable.

See Google Drive Files: create for more details.

Also See Google Drive Multipart Upload for more details.

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

BOOL success = YES;

// It 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 
// Google Drive scope.

CkoAuthGoogle *gAuth = [[CkoAuthGoogle alloc] init];
gAuth.AccessToken = @"GOOGLE-DRIVE-ACCESS-TOKEN";

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 token)
[rest SetAuthGoogle: gAuth];

// A multipart upload to Google Drive needs a multipart/related Content-Type
[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";
[rest AddHeader: @"Content-Type" value: @"application/json; charset=UTF-8"];

CkoJsonObject *json = [[CkoJsonObject alloc] init];
[json AppendString: @"name" value: @"helloWorld.txt"];
[json AppendString: @"description" value: @"A simple text file that says Hello World."];
[json AppendString: @"mimeType" value: @"text/plain"];
[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";
[rest AddHeader: @"Content-Type" value: @"text/plain"];

NSString *fileContents = @"Hello World!";
[rest SetMultipartBodyString: fileContents];

NSString *jsonResponse = [rest FullRequestMultipart: @"POST" uriPath: @"/upload/drive/v3/files?uploadType=multipart"];
if (rest.LastMethodSuccess != YES) {
    NSLog(@"%@",rest.LastErrorText);
    return;
}

// A successful response will have a status code equal to 200.
if ([rest.ResponseStatusCode intValue] != 200) {
    NSLog(@"%@%d",@"response status code = ",[rest.ResponseStatusCode intValue]);
    NSLog(@"%@%@",@"response status text = ",rest.ResponseStatusText);
    NSLog(@"%@%@",@"response header: ",rest.ResponseHeader);
    NSLog(@"%@%@",@"response JSON: ",jsonResponse);
    return;
}

// Show the JSON response.
[json Load: jsonResponse];

// Show the full JSON response.
json.EmitCompact = NO;
NSLog(@"%@",[json Emit]);

// A successful response looks like this:
// {
//   "kind": "drive#file",
//   "id": "0B53Q6OSTWYoldmJ0Z3ZqT2x5MFk",
//   "name": "Untitled",
//   "mimeType": "text/plain"
// }

// Get the fileId:
NSLog(@"%@%@",@"fileId: ",[json StringOf: @"id"]);