(Lianja) 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.

llSuccess = .T.

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

loHttp = createobject("CkHttp")

loHttp.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"
// }

loHttp.SetRequestHeader("X-Upload-Content-Type","application/zip")
loHttp.SetRequestHeader("X-Upload-Content-Length","1366807")

loJson = createobject("CkJsonObject")
loJson.UpdateString("name","myZip")

loResp = loHttp.PostJson3("https://www.googleapis.com/upload/drive/v3/files?uploadType=resumable","application/json",loJson)
if (loHttp.LastMethodSuccess = .F.) then
    ? loHttp.LastErrorText
    release loHttp
    release loJson
    return
endif

lnStatusCode = loResp.StatusCode
if (lnStatusCode <> 200) then
    ? loResp.BodyStr
    ? "response status = " + str(lnStatusCode)
    release loHttp
    release loJson
    return
endif

// The session URI is in the "Location" response header:
loSbSessionUri = createobject("CkStringBuilder")
loSbSessionUri.Append(loResp.GetHeaderField("Location"))
lcSessionUri = loSbSessionUri.GetAsString()
? "Session URI: " + lcSessionUri

release loResp

// 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.
loHttp.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.
loReq = createobject("CkHttpRequest")

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

loUrl = createobject("CkUrl")
loUrl.ParseUrl(lcSessionUri)

loReq.Path = loUrl.PathWithQueryParams
? "Path with Query Param: " + loUrl.PathWithQueryParams

// Specify that the request body is to be streamed directly from a file.
llSuccess = loReq.StreamBodyFromFile("qa_data/zips/big.zip")
if (llSuccess = .F.) then
    ? loReq.LastErrorText
    release loHttp
    release loJson
    release loSbSessionUri
    release loReq
    release loUrl
    return
endif

loResp = loHttp.SynchronousRequest(loUrl.Host,loUrl.Port,loUrl.Ssl,loReq)
if (loHttp.LastMethodSuccess = .F.) then
    ? loHttp.LastErrorText
    release loHttp
    release loJson
    release loSbSessionUri
    release loReq
    release loUrl
    return
endif

? loResp.BodyStr
? "response status = " + str(lnStatusCode)

// Sample output:

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

release loResp


release loHttp
release loJson
release loSbSessionUri
release loReq
release loUrl