Xbase++ Requires Chilkat v11.0.0+

Google Drive - Resumable Upload

See more Google Drive Examples

Demonstrates how to do a resumable upload to Google Drive. Xbase++

LOCAL nSuccess
LOCAL oHttp
LOCAL oJson
LOCAL oResp
LOCAL nStatusCode
LOCAL oSbSessionUri
LOCAL cSessionUri
LOCAL oReq
LOCAL oUrl

nSuccess := 0

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

nSuccess := 1

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

oHttp := CreateObject("Chilkat.Http")

oHttp: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 HttpJson.
//  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"
//  }

oHttp:SetRequestHeader("X-Upload-Content-Type", "application/zip")
oHttp:SetRequestHeader("X-Upload-Content-Length", "1366807")

oJson := CreateObject("Chilkat.JsonObject")
oJson:UpdateString("name", "myZip")

oResp := CreateObject("Chilkat.HttpResponse")
nSuccess := oHttp:HttpJson("POST", "https://www.googleapis.com/upload/drive/v3/files?uploadType=resumable", oJson, "application/json", oResp)
IF (nSuccess == 0)
    ? oHttp:LastErrorText
    oHttp:destroy()
    oJson:destroy()
    oResp:destroy()
    RETURN
ENDIF

nStatusCode := oResp:StatusCode
IF (nStatusCode != 200)
    ? oResp:BodyStr
    ? "response status = " + Str(nStatusCode)
    oHttp:destroy()
    oJson:destroy()
    oResp:destroy()
    RETURN
ENDIF

//  The session URI is in the "Location" response header:
oSbSessionUri := CreateObject("Chilkat.StringBuilder")
oSbSessionUri:Append(oResp:GetHeaderField("Location"))
cSessionUri := oSbSessionUri:GetAsString()
? "Session URI: " + cSessionUri

//  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.
oHttp:ClearHeaders()

//  Because the file is likely large, we'll use HttpSReq which allows to to pass an HTTP request object where the body can be streamed directly from a file.
oReq := CreateObject("Chilkat.HttpRequest")

oReq:ContentType := "application/zip"
oReq:HttpVerb := "PUT"

oUrl := CreateObject("Chilkat.Url")
oUrl:ParseUrl(cSessionUri)

oReq:Path := oUrl:PathWithQueryParams
? "Path with Query Param: " + oUrl:PathWithQueryParams

//  Specify that the request body is to be streamed directly from a file.
nSuccess := oReq:StreamBodyFromFile("qa_data/zips/big.zip")
IF (nSuccess == 0)
    ? oReq:LastErrorText
    oHttp:destroy()
    oJson:destroy()
    oResp:destroy()
    oSbSessionUri:destroy()
    oReq:destroy()
    oUrl:destroy()
    RETURN
ENDIF

nSuccess := oHttp:HttpSReq(oUrl:Host, oUrl:Port, oUrl:Ssl, oReq, oResp)
IF (nSuccess == 0)
    ? oHttp:LastErrorText
    oHttp:destroy()
    oJson:destroy()
    oResp:destroy()
    oSbSessionUri:destroy()
    oReq:destroy()
    oUrl:destroy()
    RETURN
ENDIF

? oResp:BodyStr
? "response status = " + Str(oResp:StatusCode)

//  Sample output:

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

oHttp:destroy()
oJson:destroy()
oResp:destroy()
oSbSessionUri:destroy()
oReq:destroy()
oUrl:destroy()