(Objective-C) Google Drive - Resumable Upload

Demonstrates how to do a resumable upload to Google Drive.

For more information, see https://developers.google.com/drive/api/v3/manage-uploads#resumable

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

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

BOOL success = YES;

// This example uses a previously obtained access token having permission for the 
// Google Drive scope. 
// See Get Google Drive OAuth2 Access Token

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

http.AuthToken = @"GOOGLE_DRIVE_ACCESS_TOKEN";

// First we want to initiate the resumable upload.
// We send a POST to get a session URI, which will be used to upload the file, and resume if needed.

// Our POST will look like this:

// POST https://www.googleapis.com/upload/drive/v3/files?uploadType=resumable HTTP/1.1
// Authorization: Bearer [YOUR_AUTH_TOKEN]          <-- Chilkat automatically adds this header because the AuthToken property was set.
// Content-Length: 38                               <-- Chilkat will automatically add this header.
// Content-Type: application/json; charset=UTF-8    <-- This is the type of this POST, and is specified in the call to PostJson3.
// X-Upload-Content-Type: application/zip           <-- The type of file we'll be uploading
// X-Upload-Content-Length: 1366807                 <-- The size of the file we'll be uploading
// 
// {
//   "name": "myObject"
// }

[http SetRequestHeader: @"X-Upload-Content-Type" value: @"application/zip"];
[http SetRequestHeader: @"X-Upload-Content-Length" value: @"1366807"];

CkoJsonObject *json = [[CkoJsonObject alloc] init];
[json UpdateString: @"name" value: @"myZip"];

CkoHttpResponse *resp = [http PostJson3: @"https://www.googleapis.com/upload/drive/v3/files?uploadType=resumable" contentType: @"application/json" json: json];
if (http.LastMethodSuccess == NO) {
    NSLog(@"%@",http.LastErrorText);
    return;
}

int statusCode = [resp.StatusCode intValue];
if (statusCode != 200) {
    NSLog(@"%@",resp.BodyStr);
    NSLog(@"%@%d",@"response status = ",statusCode);
    return;
}

// The session URI is in the "Location" response header:
CkoStringBuilder *sbSessionUri = [[CkoStringBuilder alloc] init];
[sbSessionUri Append: [resp GetHeaderField: @"Location"]];
NSString *sessionUri = [sbSessionUri GetAsString];
NSLog(@"%@%@",@"Session URI: ",sessionUri);

// Here's a sample session URI:  https://www.googleapis.com/upload/drive/v3/files?uploadType=resumable&upload_id=AEnB2UrszR8lDqlo3mtXJw_0rYI_Hi1oVh1NPFcLfoyBq9NcSjk85kFopoZaVEgT38OSmLl0XsObPf4iCSJwHlrOvvIJQ_ckIQ

// -----------------------------------------------------------------------------
// The next step is to upload the file using the session URI:

// We'll send a PUT that looks like this:

// PUT https://www.googleapis.com/upload/drive/v3/files?uploadType=resumable&upload_id=xa298sd_sdlkj2 HTTP/1.1
// Content-Length: 1366807
// Content-Type: application/zip
// 
// [BYTES 0-1366806]

// First remove the X-Upload-Content-Type and X-Upload-Content-Length request headers we specified earlier, so they don't get sent with subsequent requests.
[http ClearHeaders];

// Because the file is likely large, we'll use SynchronousRequest which allows to to pass an HTTP request object where the body can be streamed directly from a file.
CkoHttpRequest *req = [[CkoHttpRequest alloc] init];

req.ContentType = @"application/zip";
req.HttpVerb = @"PUT";

CkoUrl *url = [[CkoUrl alloc] init];
[url ParseUrl: sessionUri];

req.Path = url.PathWithQueryParams;
NSLog(@"%@%@",@"Path with Query Param: ",url.PathWithQueryParams);

// Specify that the request body is to be streamed directly from a file.
success = [req StreamBodyFromFile: @"qa_data/zips/big.zip"];
if (success == NO) {
    NSLog(@"%@",req.LastErrorText);
    return;
}

resp = [http SynchronousRequest: url.Host port: url.Port ssl: url.Ssl req: req];
if (http.LastMethodSuccess == NO) {
    NSLog(@"%@",http.LastErrorText);
    return;
}

NSLog(@"%@",resp.BodyStr);
NSLog(@"%@%d",@"response status = ",statusCode);

// Sample output:

// {
//  "kind": "drive#file",
//  "id": "1rx20i53eurtkVQ-RT7Ry8Ct85PgPYMET",
//  "name": "myZip",
//  "mimeType": "application/zip"
// }
// 
// response status = 200