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

Dim success As Boolean
success = True

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

Dim http As New Chilkat.Http

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","application/zip"
http.SetRequestHeader "X-Upload-Content-Length","1366807"

Dim json As New Chilkat.JsonObject
success = json.UpdateString("name","myZip")

Dim resp As Chilkat.HttpResponse
resp = http.PostJson3("https://www.googleapis.com/upload/drive/v3/files?uploadType=resumable","application/json",json)
If (http.LastMethodSuccess = False) Then
    System.DebugLog(http.LastErrorText)
    Return
End If

Dim statusCode As Int32
statusCode = resp.StatusCode
If (statusCode <> 200) Then
    System.DebugLog(resp.BodyStr)
    System.DebugLog("response status = " + Str(statusCode))
    Return
End If

// The session URI is in the "Location" response header:
Dim sbSessionUri As New Chilkat.StringBuilder
success = sbSessionUri.Append(resp.GetHeaderField("Location"))
Dim sessionUri As String
sessionUri = sbSessionUri.GetAsString()
System.DebugLog("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.
Dim req As New Chilkat.HttpRequest

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

Dim url As New Chilkat.Url
success = url.ParseUrl(sessionUri)

req.Path = url.PathWithQueryParams
System.DebugLog("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 = False) Then
    System.DebugLog(req.LastErrorText)
    Return
End If

resp = http.SynchronousRequest(url.Host,url.Port,url.Ssl,req)
If (http.LastMethodSuccess = False) Then
    System.DebugLog(http.LastErrorText)
    Return
End If

System.DebugLog(resp.BodyStr)
System.DebugLog("response status = " + Str(statusCode))

// Sample output:

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