(Unicode 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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#include <CkHttpW.h>
#include <CkJsonObjectW.h>
#include <CkHttpResponseW.h>
#include <CkStringBuilderW.h>
#include <CkHttpRequestW.h>
#include <CkUrlW.h>

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

    bool success = true;

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

    CkHttpW http;

    http.put_AuthToken(L"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(L"X-Upload-Content-Type",L"application/zip");
    http.SetRequestHeader(L"X-Upload-Content-Length",L"1366807");

    CkJsonObjectW json;
    json.UpdateString(L"name",L"myZip");

    CkHttpResponseW *resp = http.PostJson3(L"https://www.googleapis.com/upload/drive/v3/files?uploadType=resumable",L"application/json",json);
    if (http.get_LastMethodSuccess() == false) {
        wprintf(L"%s\n",http.lastErrorText());
        return;
    }

    int statusCode = resp->get_StatusCode();
    if (statusCode != 200) {
        wprintf(L"%s\n",resp->bodyStr());
        wprintf(L"response status = %d\n",statusCode);
        return;
    }

    // The session URI is in the "Location" response header:
    CkStringBuilderW sbSessionUri;
    sbSessionUri.Append(resp->getHeaderField(L"Location"));
    const wchar_t *sessionUri = sbSessionUri.getAsString();
    wprintf(L"Session URI: %s\n",sessionUri);

    delete resp;

    // 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.
    CkHttpRequestW req;

    req.put_ContentType(L"application/zip");
    req.put_HttpVerb(L"PUT");

    CkUrlW url;
    url.ParseUrl(sessionUri);

    req.put_Path(url.pathWithQueryParams());
    wprintf(L"Path with Query Param: %s\n",url.pathWithQueryParams());

    // Specify that the request body is to be streamed directly from a file.
    success = req.StreamBodyFromFile(L"qa_data/zips/big.zip");
    if (success == false) {
        wprintf(L"%s\n",req.lastErrorText());
        return;
    }

    resp = http.SynchronousRequest(url.host(),url.get_Port(),url.get_Ssl(),req);
    if (http.get_LastMethodSuccess() == false) {
        wprintf(L"%s\n",http.lastErrorText());
        return;
    }

    wprintf(L"%s\n",resp->bodyStr());
    wprintf(L"response status = %d\n",statusCode);

    // Sample output:

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

    delete resp;
    }