(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 <C_CkHttp.h>
#include <C_CkJsonObject.h>
#include <C_CkHttpResponse.h>
#include <C_CkStringBuilder.h>
#include <C_CkHttpRequest.h>
#include <C_CkUrl.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkHttp http;
    HCkJsonObject json;
    HCkHttpResponse resp;
    int statusCode;
    HCkStringBuilder sbSessionUri;
    const char *sessionUri;
    HCkHttpRequest req;
    HCkUrl url;

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

    success = TRUE;

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

    http = CkHttp_Create();

    CkHttp_putAuthToken(http,"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"
    // }

    CkHttp_SetRequestHeader(http,"X-Upload-Content-Type","application/zip");
    CkHttp_SetRequestHeader(http,"X-Upload-Content-Length","1366807");

    json = CkJsonObject_Create();
    CkJsonObject_UpdateString(json,"name","myZip");

    resp = CkHttp_PostJson3(http,"https://www.googleapis.com/upload/drive/v3/files?uploadType=resumable","application/json",json);
    if (CkHttp_getLastMethodSuccess(http) == FALSE) {
        printf("%s\n",CkHttp_lastErrorText(http));
        CkHttp_Dispose(http);
        CkJsonObject_Dispose(json);
        return;
    }

    statusCode = CkHttpResponse_getStatusCode(resp);
    if (statusCode != 200) {
        printf("%s\n",CkHttpResponse_bodyStr(resp));
        printf("response status = %d\n",statusCode);
        CkHttp_Dispose(http);
        CkJsonObject_Dispose(json);
        return;
    }

    // The session URI is in the "Location" response header:
    sbSessionUri = CkStringBuilder_Create();
    CkStringBuilder_Append(sbSessionUri,CkHttpResponse_getHeaderField(resp,"Location"));
    sessionUri = CkStringBuilder_getAsString(sbSessionUri);
    printf("Session URI: %s\n",sessionUri);

    CkHttpResponse_Dispose(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.
    CkHttp_ClearHeaders(http);

    // 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.
    req = CkHttpRequest_Create();

    CkHttpRequest_putContentType(req,"application/zip");
    CkHttpRequest_putHttpVerb(req,"PUT");

    url = CkUrl_Create();
    CkUrl_ParseUrl(url,sessionUri);

    CkHttpRequest_putPath(req,CkUrl_pathWithQueryParams(url));
    printf("Path with Query Param: %s\n",CkUrl_pathWithQueryParams(url));

    // Specify that the request body is to be streamed directly from a file.
    success = CkHttpRequest_StreamBodyFromFile(req,"qa_data/zips/big.zip");
    if (success == FALSE) {
        printf("%s\n",CkHttpRequest_lastErrorText(req));
        CkHttp_Dispose(http);
        CkJsonObject_Dispose(json);
        CkStringBuilder_Dispose(sbSessionUri);
        CkHttpRequest_Dispose(req);
        CkUrl_Dispose(url);
        return;
    }

    resp = CkHttp_SynchronousRequest(http,CkUrl_host(url),CkUrl_getPort(url),CkUrl_getSsl(url),req);
    if (CkHttp_getLastMethodSuccess(http) == FALSE) {
        printf("%s\n",CkHttp_lastErrorText(http));
        CkHttp_Dispose(http);
        CkJsonObject_Dispose(json);
        CkStringBuilder_Dispose(sbSessionUri);
        CkHttpRequest_Dispose(req);
        CkUrl_Dispose(url);
        return;
    }

    printf("%s\n",CkHttpResponse_bodyStr(resp));
    printf("response status = %d\n",statusCode);

    // Sample output:

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

    CkHttpResponse_Dispose(resp);


    CkHttp_Dispose(http);
    CkJsonObject_Dispose(json);
    CkStringBuilder_Dispose(sbSessionUri);
    CkHttpRequest_Dispose(req);
    CkUrl_Dispose(url);

    }